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OpenCloudOS-Kernel/drivers/clk/samsung/clk-exynos850.c

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clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 Linaro Ltd.
* Author: Sam Protsenko <semen.protsenko@linaro.org>
*
* Common Clock Framework support for Exynos850 SoC.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <dt-bindings/clock/exynos850.h>
#include "clk.h"
clk: samsung: Make exynos850_register_cmu shared Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it to a new file called "clk-exynos-arm64.c". This should have no functional changes, but it will allow this code to be shared between other arm64 Exynos SoCs, like the Exynos7885 and possibly ExynosAuto V9. Signed-off-by: David Virag <virag.david003@gmail.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211206153124.427102-5-virag.david003@gmail.com
2021-12-06 23:31:18 +08:00
#include "clk-exynos-arm64.h"
clk: samsung: exynos850: Register clocks early Some clocks must be registered before init calls. For example MCT clock (from CMU_PERI) is needed for MCT timer driver, which is registered with TIMER_OF_DECLARE(). By the time we get to core_initcall() used for clk-exynos850 platform driver init, it's already too late. Inability to get "mct" clock in MCT driver leads to kernel panic, as functions registered with *_OF_DECLARE() can't do deferred calls. MCT timer driver can't be fixed either, as it's acting as a clock source and it's essential to register it in start_kernel() -> time_init(). Let's register CMU_PERI clocks early, using CLK_OF_DECLARE(). CMU_TOP generates clocks needed for CMU_PERI, but it's already registered early. While at it, let's cleanup the code a bit, by extracting everything related to CMU initialization and registration to the separate function. Similar issue was discussed at [1] and addressed in commit 1f7db7bbf031 ("clk: renesas: cpg-mssr: Add early clock support"), as well as in drivers/clk/mediatek/clk-mt2712.c. [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20180829132954.64862-2-chris.brandt@renesas.com/ Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211122144206.23134-1-semen.protsenko@linaro.org
2021-11-22 22:42:06 +08:00
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* ---- CMU_TOP ------------------------------------------------------------- */
/* Register Offset definitions for CMU_TOP (0x120e0000) */
#define PLL_LOCKTIME_PLL_MMC 0x0000
#define PLL_LOCKTIME_PLL_SHARED0 0x0004
#define PLL_LOCKTIME_PLL_SHARED1 0x0008
#define PLL_CON0_PLL_MMC 0x0100
#define PLL_CON3_PLL_MMC 0x010c
#define PLL_CON0_PLL_SHARED0 0x0140
#define PLL_CON3_PLL_SHARED0 0x014c
#define PLL_CON0_PLL_SHARED1 0x0180
#define PLL_CON3_PLL_SHARED1 0x018c
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
#define CLK_CON_MUX_MUX_CLKCMU_APM_BUS 0x1000
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
#define CLK_CON_MUX_MUX_CLKCMU_CORE_BUS 0x1014
#define CLK_CON_MUX_MUX_CLKCMU_CORE_CCI 0x1018
#define CLK_CON_MUX_MUX_CLKCMU_CORE_MMC_EMBD 0x101c
#define CLK_CON_MUX_MUX_CLKCMU_CORE_SSS 0x1020
#define CLK_CON_MUX_MUX_CLKCMU_DPU 0x1034
#define CLK_CON_MUX_MUX_CLKCMU_HSI_BUS 0x103c
#define CLK_CON_MUX_MUX_CLKCMU_HSI_MMC_CARD 0x1040
#define CLK_CON_MUX_MUX_CLKCMU_HSI_USB20DRD 0x1044
#define CLK_CON_MUX_MUX_CLKCMU_PERI_BUS 0x1070
#define CLK_CON_MUX_MUX_CLKCMU_PERI_IP 0x1074
#define CLK_CON_MUX_MUX_CLKCMU_PERI_UART 0x1078
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
#define CLK_CON_DIV_CLKCMU_APM_BUS 0x180c
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
#define CLK_CON_DIV_CLKCMU_CORE_BUS 0x1820
#define CLK_CON_DIV_CLKCMU_CORE_CCI 0x1824
#define CLK_CON_DIV_CLKCMU_CORE_MMC_EMBD 0x1828
#define CLK_CON_DIV_CLKCMU_CORE_SSS 0x182c
#define CLK_CON_DIV_CLKCMU_DPU 0x1840
#define CLK_CON_DIV_CLKCMU_HSI_BUS 0x1848
#define CLK_CON_DIV_CLKCMU_HSI_MMC_CARD 0x184c
#define CLK_CON_DIV_CLKCMU_HSI_USB20DRD 0x1850
#define CLK_CON_DIV_CLKCMU_PERI_BUS 0x187c
#define CLK_CON_DIV_CLKCMU_PERI_IP 0x1880
#define CLK_CON_DIV_CLKCMU_PERI_UART 0x1884
#define CLK_CON_DIV_PLL_SHARED0_DIV2 0x188c
#define CLK_CON_DIV_PLL_SHARED0_DIV3 0x1890
#define CLK_CON_DIV_PLL_SHARED0_DIV4 0x1894
#define CLK_CON_DIV_PLL_SHARED1_DIV2 0x1898
#define CLK_CON_DIV_PLL_SHARED1_DIV3 0x189c
#define CLK_CON_DIV_PLL_SHARED1_DIV4 0x18a0
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
#define CLK_CON_GAT_GATE_CLKCMU_APM_BUS 0x2008
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
#define CLK_CON_GAT_GATE_CLKCMU_CORE_BUS 0x201c
#define CLK_CON_GAT_GATE_CLKCMU_CORE_CCI 0x2020
#define CLK_CON_GAT_GATE_CLKCMU_CORE_MMC_EMBD 0x2024
#define CLK_CON_GAT_GATE_CLKCMU_CORE_SSS 0x2028
#define CLK_CON_GAT_GATE_CLKCMU_DPU 0x203c
#define CLK_CON_GAT_GATE_CLKCMU_HSI_BUS 0x2044
#define CLK_CON_GAT_GATE_CLKCMU_HSI_MMC_CARD 0x2048
#define CLK_CON_GAT_GATE_CLKCMU_HSI_USB20DRD 0x204c
#define CLK_CON_GAT_GATE_CLKCMU_PERI_BUS 0x2080
#define CLK_CON_GAT_GATE_CLKCMU_PERI_IP 0x2084
#define CLK_CON_GAT_GATE_CLKCMU_PERI_UART 0x2088
static const unsigned long top_clk_regs[] __initconst = {
PLL_LOCKTIME_PLL_MMC,
PLL_LOCKTIME_PLL_SHARED0,
PLL_LOCKTIME_PLL_SHARED1,
PLL_CON0_PLL_MMC,
PLL_CON3_PLL_MMC,
PLL_CON0_PLL_SHARED0,
PLL_CON3_PLL_SHARED0,
PLL_CON0_PLL_SHARED1,
PLL_CON3_PLL_SHARED1,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
CLK_CON_MUX_MUX_CLKCMU_APM_BUS,
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
CLK_CON_MUX_MUX_CLKCMU_CORE_BUS,
CLK_CON_MUX_MUX_CLKCMU_CORE_CCI,
CLK_CON_MUX_MUX_CLKCMU_CORE_MMC_EMBD,
CLK_CON_MUX_MUX_CLKCMU_CORE_SSS,
CLK_CON_MUX_MUX_CLKCMU_DPU,
CLK_CON_MUX_MUX_CLKCMU_HSI_BUS,
CLK_CON_MUX_MUX_CLKCMU_HSI_MMC_CARD,
CLK_CON_MUX_MUX_CLKCMU_HSI_USB20DRD,
CLK_CON_MUX_MUX_CLKCMU_PERI_BUS,
CLK_CON_MUX_MUX_CLKCMU_PERI_IP,
CLK_CON_MUX_MUX_CLKCMU_PERI_UART,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
CLK_CON_DIV_CLKCMU_APM_BUS,
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
CLK_CON_DIV_CLKCMU_CORE_BUS,
CLK_CON_DIV_CLKCMU_CORE_CCI,
CLK_CON_DIV_CLKCMU_CORE_MMC_EMBD,
CLK_CON_DIV_CLKCMU_CORE_SSS,
CLK_CON_DIV_CLKCMU_DPU,
CLK_CON_DIV_CLKCMU_HSI_BUS,
CLK_CON_DIV_CLKCMU_HSI_MMC_CARD,
CLK_CON_DIV_CLKCMU_HSI_USB20DRD,
CLK_CON_DIV_CLKCMU_PERI_BUS,
CLK_CON_DIV_CLKCMU_PERI_IP,
CLK_CON_DIV_CLKCMU_PERI_UART,
CLK_CON_DIV_PLL_SHARED0_DIV2,
CLK_CON_DIV_PLL_SHARED0_DIV3,
CLK_CON_DIV_PLL_SHARED0_DIV4,
CLK_CON_DIV_PLL_SHARED1_DIV2,
CLK_CON_DIV_PLL_SHARED1_DIV3,
CLK_CON_DIV_PLL_SHARED1_DIV4,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
CLK_CON_GAT_GATE_CLKCMU_APM_BUS,
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
CLK_CON_GAT_GATE_CLKCMU_CORE_BUS,
CLK_CON_GAT_GATE_CLKCMU_CORE_CCI,
CLK_CON_GAT_GATE_CLKCMU_CORE_MMC_EMBD,
CLK_CON_GAT_GATE_CLKCMU_CORE_SSS,
CLK_CON_GAT_GATE_CLKCMU_DPU,
CLK_CON_GAT_GATE_CLKCMU_HSI_BUS,
CLK_CON_GAT_GATE_CLKCMU_HSI_MMC_CARD,
CLK_CON_GAT_GATE_CLKCMU_HSI_USB20DRD,
CLK_CON_GAT_GATE_CLKCMU_PERI_BUS,
CLK_CON_GAT_GATE_CLKCMU_PERI_IP,
CLK_CON_GAT_GATE_CLKCMU_PERI_UART,
};
/*
* Do not provide PLL tables to core PLLs, as MANUAL_PLL_CTRL bit is not set
* for those PLLs by default, so set_rate operation would fail.
*/
static const struct samsung_pll_clock top_pll_clks[] __initconst = {
/* CMU_TOP_PURECLKCOMP */
PLL(pll_0822x, CLK_FOUT_SHARED0_PLL, "fout_shared0_pll", "oscclk",
PLL_LOCKTIME_PLL_SHARED0, PLL_CON3_PLL_SHARED0,
NULL),
PLL(pll_0822x, CLK_FOUT_SHARED1_PLL, "fout_shared1_pll", "oscclk",
PLL_LOCKTIME_PLL_SHARED1, PLL_CON3_PLL_SHARED1,
NULL),
PLL(pll_0831x, CLK_FOUT_MMC_PLL, "fout_mmc_pll", "oscclk",
PLL_LOCKTIME_PLL_MMC, PLL_CON3_PLL_MMC, NULL),
};
/* List of parent clocks for Muxes in CMU_TOP */
PNAME(mout_shared0_pll_p) = { "oscclk", "fout_shared0_pll" };
PNAME(mout_shared1_pll_p) = { "oscclk", "fout_shared1_pll" };
PNAME(mout_mmc_pll_p) = { "oscclk", "fout_mmc_pll" };
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
/* List of parent clocks for Muxes in CMU_TOP: for CMU_APM */
PNAME(mout_clkcmu_apm_bus_p) = { "dout_shared0_div4", "pll_shared1_div4" };
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* List of parent clocks for Muxes in CMU_TOP: for CMU_CORE */
PNAME(mout_core_bus_p) = { "dout_shared1_div2", "dout_shared0_div3",
"dout_shared1_div3", "dout_shared0_div4" };
PNAME(mout_core_cci_p) = { "dout_shared0_div2", "dout_shared1_div2",
"dout_shared0_div3", "dout_shared1_div3" };
PNAME(mout_core_mmc_embd_p) = { "oscclk", "dout_shared0_div2",
"dout_shared1_div2", "dout_shared0_div3",
"dout_shared1_div3", "mout_mmc_pll",
"oscclk", "oscclk" };
PNAME(mout_core_sss_p) = { "dout_shared0_div3", "dout_shared1_div3",
"dout_shared0_div4", "dout_shared1_div4" };
/* List of parent clocks for Muxes in CMU_TOP: for CMU_HSI */
PNAME(mout_hsi_bus_p) = { "dout_shared0_div2", "dout_shared1_div2" };
PNAME(mout_hsi_mmc_card_p) = { "oscclk", "dout_shared0_div2",
"dout_shared1_div2", "dout_shared0_div3",
"dout_shared1_div3", "mout_mmc_pll",
"oscclk", "oscclk" };
PNAME(mout_hsi_usb20drd_p) = { "oscclk", "dout_shared0_div4",
"dout_shared1_div4", "oscclk" };
/* List of parent clocks for Muxes in CMU_TOP: for CMU_PERI */
PNAME(mout_peri_bus_p) = { "dout_shared0_div4", "dout_shared1_div4" };
PNAME(mout_peri_uart_p) = { "oscclk", "dout_shared0_div4",
"dout_shared1_div4", "oscclk" };
PNAME(mout_peri_ip_p) = { "oscclk", "dout_shared0_div4",
"dout_shared1_div4", "oscclk" };
/* List of parent clocks for Muxes in CMU_TOP: for CMU_DPU */
PNAME(mout_dpu_p) = { "dout_shared0_div3", "dout_shared1_div3",
"dout_shared0_div4", "dout_shared1_div4" };
static const struct samsung_mux_clock top_mux_clks[] __initconst = {
/* CMU_TOP_PURECLKCOMP */
MUX(CLK_MOUT_SHARED0_PLL, "mout_shared0_pll", mout_shared0_pll_p,
PLL_CON0_PLL_SHARED0, 4, 1),
MUX(CLK_MOUT_SHARED1_PLL, "mout_shared1_pll", mout_shared1_pll_p,
PLL_CON0_PLL_SHARED1, 4, 1),
MUX(CLK_MOUT_MMC_PLL, "mout_mmc_pll", mout_mmc_pll_p,
PLL_CON0_PLL_MMC, 4, 1),
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
/* APM */
MUX(CLK_MOUT_CLKCMU_APM_BUS, "mout_clkcmu_apm_bus",
mout_clkcmu_apm_bus_p, CLK_CON_MUX_MUX_CLKCMU_APM_BUS, 0, 1),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* CORE */
MUX(CLK_MOUT_CORE_BUS, "mout_core_bus", mout_core_bus_p,
CLK_CON_MUX_MUX_CLKCMU_CORE_BUS, 0, 2),
MUX(CLK_MOUT_CORE_CCI, "mout_core_cci", mout_core_cci_p,
CLK_CON_MUX_MUX_CLKCMU_CORE_CCI, 0, 2),
MUX(CLK_MOUT_CORE_MMC_EMBD, "mout_core_mmc_embd", mout_core_mmc_embd_p,
CLK_CON_MUX_MUX_CLKCMU_CORE_MMC_EMBD, 0, 3),
MUX(CLK_MOUT_CORE_SSS, "mout_core_sss", mout_core_sss_p,
CLK_CON_MUX_MUX_CLKCMU_CORE_SSS, 0, 2),
/* DPU */
MUX(CLK_MOUT_DPU, "mout_dpu", mout_dpu_p,
CLK_CON_MUX_MUX_CLKCMU_DPU, 0, 2),
/* HSI */
MUX(CLK_MOUT_HSI_BUS, "mout_hsi_bus", mout_hsi_bus_p,
CLK_CON_MUX_MUX_CLKCMU_HSI_BUS, 0, 1),
MUX(CLK_MOUT_HSI_MMC_CARD, "mout_hsi_mmc_card", mout_hsi_mmc_card_p,
CLK_CON_MUX_MUX_CLKCMU_HSI_MMC_CARD, 0, 3),
MUX(CLK_MOUT_HSI_USB20DRD, "mout_hsi_usb20drd", mout_hsi_usb20drd_p,
CLK_CON_MUX_MUX_CLKCMU_HSI_USB20DRD, 0, 2),
/* PERI */
MUX(CLK_MOUT_PERI_BUS, "mout_peri_bus", mout_peri_bus_p,
CLK_CON_MUX_MUX_CLKCMU_PERI_BUS, 0, 1),
MUX(CLK_MOUT_PERI_UART, "mout_peri_uart", mout_peri_uart_p,
CLK_CON_MUX_MUX_CLKCMU_PERI_UART, 0, 2),
MUX(CLK_MOUT_PERI_IP, "mout_peri_ip", mout_peri_ip_p,
CLK_CON_MUX_MUX_CLKCMU_PERI_IP, 0, 2),
};
static const struct samsung_div_clock top_div_clks[] __initconst = {
/* CMU_TOP_PURECLKCOMP */
DIV(CLK_DOUT_SHARED0_DIV3, "dout_shared0_div3", "mout_shared0_pll",
CLK_CON_DIV_PLL_SHARED0_DIV3, 0, 2),
DIV(CLK_DOUT_SHARED0_DIV2, "dout_shared0_div2", "mout_shared0_pll",
CLK_CON_DIV_PLL_SHARED0_DIV2, 0, 1),
DIV(CLK_DOUT_SHARED1_DIV3, "dout_shared1_div3", "mout_shared1_pll",
CLK_CON_DIV_PLL_SHARED1_DIV3, 0, 2),
DIV(CLK_DOUT_SHARED1_DIV2, "dout_shared1_div2", "mout_shared1_pll",
CLK_CON_DIV_PLL_SHARED1_DIV2, 0, 1),
DIV(CLK_DOUT_SHARED0_DIV4, "dout_shared0_div4", "dout_shared0_div2",
CLK_CON_DIV_PLL_SHARED0_DIV4, 0, 1),
DIV(CLK_DOUT_SHARED1_DIV4, "dout_shared1_div4", "dout_shared1_div2",
CLK_CON_DIV_PLL_SHARED1_DIV4, 0, 1),
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
/* APM */
DIV(CLK_DOUT_CLKCMU_APM_BUS, "dout_clkcmu_apm_bus",
"gout_clkcmu_apm_bus", CLK_CON_DIV_CLKCMU_APM_BUS, 0, 3),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* CORE */
DIV(CLK_DOUT_CORE_BUS, "dout_core_bus", "gout_core_bus",
CLK_CON_DIV_CLKCMU_CORE_BUS, 0, 4),
DIV(CLK_DOUT_CORE_CCI, "dout_core_cci", "gout_core_cci",
CLK_CON_DIV_CLKCMU_CORE_CCI, 0, 4),
DIV(CLK_DOUT_CORE_MMC_EMBD, "dout_core_mmc_embd", "gout_core_mmc_embd",
CLK_CON_DIV_CLKCMU_CORE_MMC_EMBD, 0, 9),
DIV(CLK_DOUT_CORE_SSS, "dout_core_sss", "gout_core_sss",
CLK_CON_DIV_CLKCMU_CORE_SSS, 0, 4),
/* DPU */
DIV(CLK_DOUT_DPU, "dout_dpu", "gout_dpu",
CLK_CON_DIV_CLKCMU_DPU, 0, 4),
/* HSI */
DIV(CLK_DOUT_HSI_BUS, "dout_hsi_bus", "gout_hsi_bus",
CLK_CON_DIV_CLKCMU_HSI_BUS, 0, 4),
DIV(CLK_DOUT_HSI_MMC_CARD, "dout_hsi_mmc_card", "gout_hsi_mmc_card",
CLK_CON_DIV_CLKCMU_HSI_MMC_CARD, 0, 9),
DIV(CLK_DOUT_HSI_USB20DRD, "dout_hsi_usb20drd", "gout_hsi_usb20drd",
CLK_CON_DIV_CLKCMU_HSI_USB20DRD, 0, 4),
/* PERI */
DIV(CLK_DOUT_PERI_BUS, "dout_peri_bus", "gout_peri_bus",
CLK_CON_DIV_CLKCMU_PERI_BUS, 0, 4),
DIV(CLK_DOUT_PERI_UART, "dout_peri_uart", "gout_peri_uart",
CLK_CON_DIV_CLKCMU_PERI_UART, 0, 4),
DIV(CLK_DOUT_PERI_IP, "dout_peri_ip", "gout_peri_ip",
CLK_CON_DIV_CLKCMU_PERI_IP, 0, 4),
};
static const struct samsung_gate_clock top_gate_clks[] __initconst = {
/* CORE */
GATE(CLK_GOUT_CORE_BUS, "gout_core_bus", "mout_core_bus",
CLK_CON_GAT_GATE_CLKCMU_CORE_BUS, 21, 0, 0),
GATE(CLK_GOUT_CORE_CCI, "gout_core_cci", "mout_core_cci",
CLK_CON_GAT_GATE_CLKCMU_CORE_CCI, 21, 0, 0),
GATE(CLK_GOUT_CORE_MMC_EMBD, "gout_core_mmc_embd", "mout_core_mmc_embd",
CLK_CON_GAT_GATE_CLKCMU_CORE_MMC_EMBD, 21, 0, 0),
GATE(CLK_GOUT_CORE_SSS, "gout_core_sss", "mout_core_sss",
CLK_CON_GAT_GATE_CLKCMU_CORE_SSS, 21, 0, 0),
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
/* APM */
GATE(CLK_GOUT_CLKCMU_APM_BUS, "gout_clkcmu_apm_bus",
"mout_clkcmu_apm_bus", CLK_CON_GAT_GATE_CLKCMU_APM_BUS, 21, 0, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* DPU */
GATE(CLK_GOUT_DPU, "gout_dpu", "mout_dpu",
CLK_CON_GAT_GATE_CLKCMU_DPU, 21, 0, 0),
/* HSI */
GATE(CLK_GOUT_HSI_BUS, "gout_hsi_bus", "mout_hsi_bus",
CLK_CON_GAT_GATE_CLKCMU_HSI_BUS, 21, 0, 0),
GATE(CLK_GOUT_HSI_MMC_CARD, "gout_hsi_mmc_card", "mout_hsi_mmc_card",
CLK_CON_GAT_GATE_CLKCMU_HSI_MMC_CARD, 21, 0, 0),
GATE(CLK_GOUT_HSI_USB20DRD, "gout_hsi_usb20drd", "mout_hsi_usb20drd",
CLK_CON_GAT_GATE_CLKCMU_HSI_USB20DRD, 21, 0, 0),
/* PERI */
GATE(CLK_GOUT_PERI_BUS, "gout_peri_bus", "mout_peri_bus",
CLK_CON_GAT_GATE_CLKCMU_PERI_BUS, 21, 0, 0),
GATE(CLK_GOUT_PERI_UART, "gout_peri_uart", "mout_peri_uart",
CLK_CON_GAT_GATE_CLKCMU_PERI_UART, 21, 0, 0),
GATE(CLK_GOUT_PERI_IP, "gout_peri_ip", "mout_peri_ip",
CLK_CON_GAT_GATE_CLKCMU_PERI_IP, 21, 0, 0),
};
static const struct samsung_cmu_info top_cmu_info __initconst = {
.pll_clks = top_pll_clks,
.nr_pll_clks = ARRAY_SIZE(top_pll_clks),
.mux_clks = top_mux_clks,
.nr_mux_clks = ARRAY_SIZE(top_mux_clks),
.div_clks = top_div_clks,
.nr_div_clks = ARRAY_SIZE(top_div_clks),
.gate_clks = top_gate_clks,
.nr_gate_clks = ARRAY_SIZE(top_gate_clks),
.nr_clk_ids = TOP_NR_CLK,
.clk_regs = top_clk_regs,
.nr_clk_regs = ARRAY_SIZE(top_clk_regs),
};
static void __init exynos850_cmu_top_init(struct device_node *np)
{
clk: samsung: Make exynos850_register_cmu shared Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it to a new file called "clk-exynos-arm64.c". This should have no functional changes, but it will allow this code to be shared between other arm64 Exynos SoCs, like the Exynos7885 and possibly ExynosAuto V9. Signed-off-by: David Virag <virag.david003@gmail.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211206153124.427102-5-virag.david003@gmail.com
2021-12-06 23:31:18 +08:00
exynos_arm64_register_cmu(NULL, np, &top_cmu_info);
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
}
clk: samsung: exynos850: Register clocks early Some clocks must be registered before init calls. For example MCT clock (from CMU_PERI) is needed for MCT timer driver, which is registered with TIMER_OF_DECLARE(). By the time we get to core_initcall() used for clk-exynos850 platform driver init, it's already too late. Inability to get "mct" clock in MCT driver leads to kernel panic, as functions registered with *_OF_DECLARE() can't do deferred calls. MCT timer driver can't be fixed either, as it's acting as a clock source and it's essential to register it in start_kernel() -> time_init(). Let's register CMU_PERI clocks early, using CLK_OF_DECLARE(). CMU_TOP generates clocks needed for CMU_PERI, but it's already registered early. While at it, let's cleanup the code a bit, by extracting everything related to CMU initialization and registration to the separate function. Similar issue was discussed at [1] and addressed in commit 1f7db7bbf031 ("clk: renesas: cpg-mssr: Add early clock support"), as well as in drivers/clk/mediatek/clk-mt2712.c. [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20180829132954.64862-2-chris.brandt@renesas.com/ Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211122144206.23134-1-semen.protsenko@linaro.org
2021-11-22 22:42:06 +08:00
/* Register CMU_TOP early, as it's a dependency for other early domains */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
CLK_OF_DECLARE(exynos850_cmu_top, "samsung,exynos850-cmu-top",
exynos850_cmu_top_init);
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
/* ---- CMU_APM ------------------------------------------------------------- */
/* Register Offset definitions for CMU_APM (0x11800000) */
#define PLL_CON0_MUX_CLKCMU_APM_BUS_USER 0x0600
#define PLL_CON0_MUX_CLK_RCO_APM_I3C_USER 0x0610
#define PLL_CON0_MUX_CLK_RCO_APM_USER 0x0620
#define PLL_CON0_MUX_DLL_USER 0x0630
#define CLK_CON_MUX_MUX_CLKCMU_CHUB_BUS 0x1000
#define CLK_CON_MUX_MUX_CLK_APM_BUS 0x1004
#define CLK_CON_MUX_MUX_CLK_APM_I3C 0x1008
#define CLK_CON_DIV_CLKCMU_CHUB_BUS 0x1800
#define CLK_CON_DIV_DIV_CLK_APM_BUS 0x1804
#define CLK_CON_DIV_DIV_CLK_APM_I3C 0x1808
#define CLK_CON_GAT_CLKCMU_CMGP_BUS 0x2000
#define CLK_CON_GAT_GATE_CLKCMU_CHUB_BUS 0x2014
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
#define CLK_CON_GAT_GOUT_APM_APBIF_GPIO_ALIVE_PCLK 0x2018
#define CLK_CON_GAT_GOUT_APM_APBIF_PMU_ALIVE_PCLK 0x2020
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
#define CLK_CON_GAT_GOUT_APM_APBIF_RTC_PCLK 0x2024
#define CLK_CON_GAT_GOUT_APM_APBIF_TOP_RTC_PCLK 0x2028
#define CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK 0x2034
#define CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK 0x2038
#define CLK_CON_GAT_GOUT_APM_SPEEDY_APM_PCLK 0x20bc
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
#define CLK_CON_GAT_GOUT_APM_SYSREG_APM_PCLK 0x20c0
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
static const unsigned long apm_clk_regs[] __initconst = {
PLL_CON0_MUX_CLKCMU_APM_BUS_USER,
PLL_CON0_MUX_CLK_RCO_APM_I3C_USER,
PLL_CON0_MUX_CLK_RCO_APM_USER,
PLL_CON0_MUX_DLL_USER,
CLK_CON_MUX_MUX_CLKCMU_CHUB_BUS,
CLK_CON_MUX_MUX_CLK_APM_BUS,
CLK_CON_MUX_MUX_CLK_APM_I3C,
CLK_CON_DIV_CLKCMU_CHUB_BUS,
CLK_CON_DIV_DIV_CLK_APM_BUS,
CLK_CON_DIV_DIV_CLK_APM_I3C,
CLK_CON_GAT_CLKCMU_CMGP_BUS,
CLK_CON_GAT_GATE_CLKCMU_CHUB_BUS,
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
CLK_CON_GAT_GOUT_APM_APBIF_GPIO_ALIVE_PCLK,
CLK_CON_GAT_GOUT_APM_APBIF_PMU_ALIVE_PCLK,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
CLK_CON_GAT_GOUT_APM_APBIF_RTC_PCLK,
CLK_CON_GAT_GOUT_APM_APBIF_TOP_RTC_PCLK,
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK,
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK,
CLK_CON_GAT_GOUT_APM_SPEEDY_APM_PCLK,
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
CLK_CON_GAT_GOUT_APM_SYSREG_APM_PCLK,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
};
/* List of parent clocks for Muxes in CMU_APM */
PNAME(mout_apm_bus_user_p) = { "oscclk_rco_apm", "dout_clkcmu_apm_bus" };
PNAME(mout_rco_apm_i3c_user_p) = { "oscclk_rco_apm", "clk_rco_i3c_pmic" };
PNAME(mout_rco_apm_user_p) = { "oscclk_rco_apm", "clk_rco_apm__alv" };
PNAME(mout_dll_user_p) = { "oscclk_rco_apm", "clk_dll_dco" };
PNAME(mout_clkcmu_chub_bus_p) = { "mout_apm_bus_user", "mout_dll_user" };
PNAME(mout_apm_bus_p) = { "mout_rco_apm_user", "mout_apm_bus_user",
"mout_dll_user", "oscclk_rco_apm" };
PNAME(mout_apm_i3c_p) = { "dout_apm_i3c", "mout_rco_apm_i3c_user" };
static const struct samsung_fixed_rate_clock apm_fixed_clks[] __initconst = {
FRATE(CLK_RCO_I3C_PMIC, "clk_rco_i3c_pmic", NULL, 0, 491520000),
FRATE(OSCCLK_RCO_APM, "oscclk_rco_apm", NULL, 0, 24576000),
FRATE(CLK_RCO_APM__ALV, "clk_rco_apm__alv", NULL, 0, 49152000),
FRATE(CLK_DLL_DCO, "clk_dll_dco", NULL, 0, 360000000),
};
static const struct samsung_mux_clock apm_mux_clks[] __initconst = {
MUX(CLK_MOUT_APM_BUS_USER, "mout_apm_bus_user", mout_apm_bus_user_p,
PLL_CON0_MUX_CLKCMU_APM_BUS_USER, 4, 1),
MUX(CLK_MOUT_RCO_APM_I3C_USER, "mout_rco_apm_i3c_user",
mout_rco_apm_i3c_user_p, PLL_CON0_MUX_CLK_RCO_APM_I3C_USER, 4, 1),
MUX(CLK_MOUT_RCO_APM_USER, "mout_rco_apm_user", mout_rco_apm_user_p,
PLL_CON0_MUX_CLK_RCO_APM_USER, 4, 1),
MUX(CLK_MOUT_DLL_USER, "mout_dll_user", mout_dll_user_p,
PLL_CON0_MUX_DLL_USER, 4, 1),
MUX(CLK_MOUT_CLKCMU_CHUB_BUS, "mout_clkcmu_chub_bus",
mout_clkcmu_chub_bus_p, CLK_CON_MUX_MUX_CLKCMU_CHUB_BUS, 0, 1),
MUX(CLK_MOUT_APM_BUS, "mout_apm_bus", mout_apm_bus_p,
CLK_CON_MUX_MUX_CLK_APM_BUS, 0, 2),
MUX(CLK_MOUT_APM_I3C, "mout_apm_i3c", mout_apm_i3c_p,
CLK_CON_MUX_MUX_CLK_APM_I3C, 0, 1),
};
static const struct samsung_div_clock apm_div_clks[] __initconst = {
DIV(CLK_DOUT_CLKCMU_CHUB_BUS, "dout_clkcmu_chub_bus",
"gout_clkcmu_chub_bus",
CLK_CON_DIV_CLKCMU_CHUB_BUS, 0, 3),
DIV(CLK_DOUT_APM_BUS, "dout_apm_bus", "mout_apm_bus",
CLK_CON_DIV_DIV_CLK_APM_BUS, 0, 3),
DIV(CLK_DOUT_APM_I3C, "dout_apm_i3c", "mout_apm_bus",
CLK_CON_DIV_DIV_CLK_APM_I3C, 0, 3),
};
static const struct samsung_gate_clock apm_gate_clks[] __initconst = {
GATE(CLK_GOUT_CLKCMU_CMGP_BUS, "gout_clkcmu_cmgp_bus", "dout_apm_bus",
CLK_CON_GAT_CLKCMU_CMGP_BUS, 21, 0, 0),
GATE(CLK_GOUT_CLKCMU_CHUB_BUS, "gout_clkcmu_chub_bus",
"mout_clkcmu_chub_bus",
CLK_CON_GAT_GATE_CLKCMU_CHUB_BUS, 21, 0, 0),
GATE(CLK_GOUT_RTC_PCLK, "gout_rtc_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_APBIF_RTC_PCLK, 21, 0, 0),
GATE(CLK_GOUT_TOP_RTC_PCLK, "gout_top_rtc_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_APBIF_TOP_RTC_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I3C_PCLK, "gout_i3c_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I3C_SCLK, "gout_i3c_sclk", "mout_apm_i3c",
CLK_CON_GAT_GOUT_APM_I3C_APM_PMIC_I_SCLK, 21, 0, 0),
GATE(CLK_GOUT_SPEEDY_PCLK, "gout_speedy_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_SPEEDY_APM_PCLK, 21, 0, 0),
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
GATE(CLK_GOUT_GPIO_ALIVE_PCLK, "gout_gpio_alive_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_APBIF_GPIO_ALIVE_PCLK, 21, CLK_IGNORE_UNUSED,
0),
GATE(CLK_GOUT_PMU_ALIVE_PCLK, "gout_pmu_alive_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_APBIF_PMU_ALIVE_PCLK, 21, 0, 0),
GATE(CLK_GOUT_SYSREG_APM_PCLK, "gout_sysreg_apm_pclk", "dout_apm_bus",
CLK_CON_GAT_GOUT_APM_SYSREG_APM_PCLK, 21, 0, 0),
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
};
static const struct samsung_cmu_info apm_cmu_info __initconst = {
.mux_clks = apm_mux_clks,
.nr_mux_clks = ARRAY_SIZE(apm_mux_clks),
.div_clks = apm_div_clks,
.nr_div_clks = ARRAY_SIZE(apm_div_clks),
.gate_clks = apm_gate_clks,
.nr_gate_clks = ARRAY_SIZE(apm_gate_clks),
.fixed_clks = apm_fixed_clks,
.nr_fixed_clks = ARRAY_SIZE(apm_fixed_clks),
.nr_clk_ids = APM_NR_CLK,
.clk_regs = apm_clk_regs,
.nr_clk_regs = ARRAY_SIZE(apm_clk_regs),
.clk_name = "dout_clkcmu_apm_bus",
};
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
/* ---- CMU_CMGP ------------------------------------------------------------ */
/* Register Offset definitions for CMU_CMGP (0x11c00000) */
#define CLK_CON_MUX_CLK_CMGP_ADC 0x1000
#define CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0 0x1004
#define CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1 0x1008
#define CLK_CON_DIV_DIV_CLK_CMGP_ADC 0x1800
#define CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP0 0x1804
#define CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP1 0x1808
#define CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S0 0x200c
#define CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S1 0x2010
#define CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK 0x2018
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
#define CLK_CON_GAT_GOUT_CMGP_SYSREG_CMGP_PCLK 0x2040
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
#define CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK 0x2044
#define CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_PCLK 0x2048
#define CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_IPCLK 0x204c
#define CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_PCLK 0x2050
static const unsigned long cmgp_clk_regs[] __initconst = {
CLK_CON_MUX_CLK_CMGP_ADC,
CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0,
CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1,
CLK_CON_DIV_DIV_CLK_CMGP_ADC,
CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP0,
CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP1,
CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S0,
CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S1,
CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK,
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
CLK_CON_GAT_GOUT_CMGP_SYSREG_CMGP_PCLK,
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK,
CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_PCLK,
CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_IPCLK,
CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_PCLK,
};
/* List of parent clocks for Muxes in CMU_CMGP */
PNAME(mout_cmgp_usi0_p) = { "clk_rco_cmgp", "gout_clkcmu_cmgp_bus" };
PNAME(mout_cmgp_usi1_p) = { "clk_rco_cmgp", "gout_clkcmu_cmgp_bus" };
PNAME(mout_cmgp_adc_p) = { "oscclk", "dout_cmgp_adc" };
static const struct samsung_fixed_rate_clock cmgp_fixed_clks[] __initconst = {
FRATE(CLK_RCO_CMGP, "clk_rco_cmgp", NULL, 0, 49152000),
};
static const struct samsung_mux_clock cmgp_mux_clks[] __initconst = {
MUX(CLK_MOUT_CMGP_ADC, "mout_cmgp_adc", mout_cmgp_adc_p,
CLK_CON_MUX_CLK_CMGP_ADC, 0, 1),
MUX(CLK_MOUT_CMGP_USI0, "mout_cmgp_usi0", mout_cmgp_usi0_p,
CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0, 0, 1),
MUX(CLK_MOUT_CMGP_USI1, "mout_cmgp_usi1", mout_cmgp_usi1_p,
CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1, 0, 1),
};
static const struct samsung_div_clock cmgp_div_clks[] __initconst = {
DIV(CLK_DOUT_CMGP_ADC, "dout_cmgp_adc", "gout_clkcmu_cmgp_bus",
CLK_CON_DIV_DIV_CLK_CMGP_ADC, 0, 4),
DIV(CLK_DOUT_CMGP_USI0, "dout_cmgp_usi0", "mout_cmgp_usi0",
CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP0, 0, 5),
DIV(CLK_DOUT_CMGP_USI1, "dout_cmgp_usi1", "mout_cmgp_usi1",
CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP1, 0, 5),
};
static const struct samsung_gate_clock cmgp_gate_clks[] __initconst = {
GATE(CLK_GOUT_CMGP_ADC_S0_PCLK, "gout_adc_s0_pclk",
"gout_clkcmu_cmgp_bus",
CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S0, 21, 0, 0),
GATE(CLK_GOUT_CMGP_ADC_S1_PCLK, "gout_adc_s1_pclk",
"gout_clkcmu_cmgp_bus",
CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S1, 21, 0, 0),
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
GATE(CLK_GOUT_CMGP_GPIO_PCLK, "gout_gpio_cmgp_pclk",
"gout_clkcmu_cmgp_bus",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK, 21, CLK_IGNORE_UNUSED, 0),
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
GATE(CLK_GOUT_CMGP_USI0_IPCLK, "gout_cmgp_usi0_ipclk", "dout_cmgp_usi0",
CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_CMGP_USI0_PCLK, "gout_cmgp_usi0_pclk",
"gout_clkcmu_cmgp_bus",
CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_PCLK, 21, 0, 0),
GATE(CLK_GOUT_CMGP_USI1_IPCLK, "gout_cmgp_usi1_ipclk", "dout_cmgp_usi1",
CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_CMGP_USI1_PCLK, "gout_cmgp_usi1_pclk",
"gout_clkcmu_cmgp_bus",
CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_PCLK, 21, 0, 0),
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
GATE(CLK_GOUT_SYSREG_CMGP_PCLK, "gout_sysreg_cmgp_pclk",
"gout_clkcmu_cmgp_bus",
CLK_CON_GAT_GOUT_CMGP_SYSREG_CMGP_PCLK, 21, 0, 0),
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
};
static const struct samsung_cmu_info cmgp_cmu_info __initconst = {
.mux_clks = cmgp_mux_clks,
.nr_mux_clks = ARRAY_SIZE(cmgp_mux_clks),
.div_clks = cmgp_div_clks,
.nr_div_clks = ARRAY_SIZE(cmgp_div_clks),
.gate_clks = cmgp_gate_clks,
.nr_gate_clks = ARRAY_SIZE(cmgp_gate_clks),
.fixed_clks = cmgp_fixed_clks,
.nr_fixed_clks = ARRAY_SIZE(cmgp_fixed_clks),
.nr_clk_ids = CMGP_NR_CLK,
.clk_regs = cmgp_clk_regs,
.nr_clk_regs = ARRAY_SIZE(cmgp_clk_regs),
.clk_name = "gout_clkcmu_cmgp_bus",
};
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* ---- CMU_HSI ------------------------------------------------------------- */
/* Register Offset definitions for CMU_HSI (0x13400000) */
#define PLL_CON0_MUX_CLKCMU_HSI_BUS_USER 0x0600
#define PLL_CON0_MUX_CLKCMU_HSI_MMC_CARD_USER 0x0610
#define PLL_CON0_MUX_CLKCMU_HSI_USB20DRD_USER 0x0620
#define CLK_CON_MUX_MUX_CLK_HSI_RTC 0x1000
#define CLK_CON_GAT_HSI_USB20DRD_TOP_I_RTC_CLK__ALV 0x2008
#define CLK_CON_GAT_HSI_USB20DRD_TOP_I_REF_CLK_50 0x200c
#define CLK_CON_GAT_HSI_USB20DRD_TOP_I_PHY_REFCLK_26 0x2010
#define CLK_CON_GAT_GOUT_HSI_GPIO_HSI_PCLK 0x2018
#define CLK_CON_GAT_GOUT_HSI_MMC_CARD_I_ACLK 0x2024
#define CLK_CON_GAT_GOUT_HSI_MMC_CARD_SDCLKIN 0x2028
#define CLK_CON_GAT_GOUT_HSI_SYSREG_HSI_PCLK 0x2038
#define CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_ACLK_PHYCTRL_20 0x203c
#define CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_BUS_CLK_EARLY 0x2040
static const unsigned long hsi_clk_regs[] __initconst = {
PLL_CON0_MUX_CLKCMU_HSI_BUS_USER,
PLL_CON0_MUX_CLKCMU_HSI_MMC_CARD_USER,
PLL_CON0_MUX_CLKCMU_HSI_USB20DRD_USER,
CLK_CON_MUX_MUX_CLK_HSI_RTC,
CLK_CON_GAT_HSI_USB20DRD_TOP_I_RTC_CLK__ALV,
CLK_CON_GAT_HSI_USB20DRD_TOP_I_REF_CLK_50,
CLK_CON_GAT_HSI_USB20DRD_TOP_I_PHY_REFCLK_26,
CLK_CON_GAT_GOUT_HSI_GPIO_HSI_PCLK,
CLK_CON_GAT_GOUT_HSI_MMC_CARD_I_ACLK,
CLK_CON_GAT_GOUT_HSI_MMC_CARD_SDCLKIN,
CLK_CON_GAT_GOUT_HSI_SYSREG_HSI_PCLK,
CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_ACLK_PHYCTRL_20,
CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_BUS_CLK_EARLY,
};
/* List of parent clocks for Muxes in CMU_PERI */
PNAME(mout_hsi_bus_user_p) = { "oscclk", "dout_hsi_bus" };
PNAME(mout_hsi_mmc_card_user_p) = { "oscclk", "dout_hsi_mmc_card" };
PNAME(mout_hsi_usb20drd_user_p) = { "oscclk", "dout_hsi_usb20drd" };
PNAME(mout_hsi_rtc_p) = { "rtcclk", "oscclk" };
static const struct samsung_mux_clock hsi_mux_clks[] __initconst = {
MUX(CLK_MOUT_HSI_BUS_USER, "mout_hsi_bus_user", mout_hsi_bus_user_p,
PLL_CON0_MUX_CLKCMU_HSI_BUS_USER, 4, 1),
MUX_F(CLK_MOUT_HSI_MMC_CARD_USER, "mout_hsi_mmc_card_user",
mout_hsi_mmc_card_user_p, PLL_CON0_MUX_CLKCMU_HSI_MMC_CARD_USER,
4, 1, CLK_SET_RATE_PARENT, 0),
MUX(CLK_MOUT_HSI_USB20DRD_USER, "mout_hsi_usb20drd_user",
mout_hsi_usb20drd_user_p, PLL_CON0_MUX_CLKCMU_HSI_USB20DRD_USER,
4, 1),
MUX(CLK_MOUT_HSI_RTC, "mout_hsi_rtc", mout_hsi_rtc_p,
CLK_CON_MUX_MUX_CLK_HSI_RTC, 0, 1),
};
static const struct samsung_gate_clock hsi_gate_clks[] __initconst = {
GATE(CLK_GOUT_USB_RTC_CLK, "gout_usb_rtc", "mout_hsi_rtc",
CLK_CON_GAT_HSI_USB20DRD_TOP_I_RTC_CLK__ALV, 21, 0, 0),
GATE(CLK_GOUT_USB_REF_CLK, "gout_usb_ref", "mout_hsi_usb20drd_user",
CLK_CON_GAT_HSI_USB20DRD_TOP_I_REF_CLK_50, 21, 0, 0),
GATE(CLK_GOUT_USB_PHY_REF_CLK, "gout_usb_phy_ref", "oscclk",
CLK_CON_GAT_HSI_USB20DRD_TOP_I_PHY_REFCLK_26, 21, 0, 0),
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_GPIO_HSI_PCLK, "gout_gpio_hsi_pclk", "mout_hsi_bus_user",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
CLK_CON_GAT_GOUT_HSI_GPIO_HSI_PCLK, 21, CLK_IGNORE_UNUSED, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_MMC_CARD_ACLK, "gout_mmc_card_aclk", "mout_hsi_bus_user",
CLK_CON_GAT_GOUT_HSI_MMC_CARD_I_ACLK, 21, 0, 0),
GATE(CLK_GOUT_MMC_CARD_SDCLKIN, "gout_mmc_card_sdclkin",
"mout_hsi_mmc_card_user",
CLK_CON_GAT_GOUT_HSI_MMC_CARD_SDCLKIN, 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_SYSREG_HSI_PCLK, "gout_sysreg_hsi_pclk",
"mout_hsi_bus_user",
CLK_CON_GAT_GOUT_HSI_SYSREG_HSI_PCLK, 21, 0, 0),
GATE(CLK_GOUT_USB_PHY_ACLK, "gout_usb_phy_aclk", "mout_hsi_bus_user",
CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_ACLK_PHYCTRL_20, 21, 0, 0),
GATE(CLK_GOUT_USB_BUS_EARLY_CLK, "gout_usb_bus_early",
"mout_hsi_bus_user",
CLK_CON_GAT_GOUT_HSI_USB20DRD_TOP_BUS_CLK_EARLY, 21, 0, 0),
};
static const struct samsung_cmu_info hsi_cmu_info __initconst = {
.mux_clks = hsi_mux_clks,
.nr_mux_clks = ARRAY_SIZE(hsi_mux_clks),
.gate_clks = hsi_gate_clks,
.nr_gate_clks = ARRAY_SIZE(hsi_gate_clks),
.nr_clk_ids = HSI_NR_CLK,
.clk_regs = hsi_clk_regs,
.nr_clk_regs = ARRAY_SIZE(hsi_clk_regs),
.clk_name = "dout_hsi_bus",
};
/* ---- CMU_PERI ------------------------------------------------------------ */
/* Register Offset definitions for CMU_PERI (0x10030000) */
#define PLL_CON0_MUX_CLKCMU_PERI_BUS_USER 0x0600
#define PLL_CON0_MUX_CLKCMU_PERI_HSI2C_USER 0x0610
#define PLL_CON0_MUX_CLKCMU_PERI_SPI_USER 0x0620
#define PLL_CON0_MUX_CLKCMU_PERI_UART_USER 0x0630
#define CLK_CON_DIV_DIV_CLK_PERI_HSI2C_0 0x1800
#define CLK_CON_DIV_DIV_CLK_PERI_HSI2C_1 0x1804
#define CLK_CON_DIV_DIV_CLK_PERI_HSI2C_2 0x1808
#define CLK_CON_DIV_DIV_CLK_PERI_SPI_0 0x180c
#define CLK_CON_GAT_GATE_CLK_PERI_HSI2C_0 0x200c
#define CLK_CON_GAT_GATE_CLK_PERI_HSI2C_1 0x2010
#define CLK_CON_GAT_GATE_CLK_PERI_HSI2C_2 0x2014
#define CLK_CON_GAT_GOUT_PERI_GPIO_PERI_PCLK 0x2020
#define CLK_CON_GAT_GOUT_PERI_HSI2C_0_IPCLK 0x2024
#define CLK_CON_GAT_GOUT_PERI_HSI2C_0_PCLK 0x2028
#define CLK_CON_GAT_GOUT_PERI_HSI2C_1_IPCLK 0x202c
#define CLK_CON_GAT_GOUT_PERI_HSI2C_1_PCLK 0x2030
#define CLK_CON_GAT_GOUT_PERI_HSI2C_2_IPCLK 0x2034
#define CLK_CON_GAT_GOUT_PERI_HSI2C_2_PCLK 0x2038
#define CLK_CON_GAT_GOUT_PERI_I2C_0_PCLK 0x203c
#define CLK_CON_GAT_GOUT_PERI_I2C_1_PCLK 0x2040
#define CLK_CON_GAT_GOUT_PERI_I2C_2_PCLK 0x2044
#define CLK_CON_GAT_GOUT_PERI_I2C_3_PCLK 0x2048
#define CLK_CON_GAT_GOUT_PERI_I2C_4_PCLK 0x204c
#define CLK_CON_GAT_GOUT_PERI_I2C_5_PCLK 0x2050
#define CLK_CON_GAT_GOUT_PERI_I2C_6_PCLK 0x2054
#define CLK_CON_GAT_GOUT_PERI_MCT_PCLK 0x205c
#define CLK_CON_GAT_GOUT_PERI_PWM_MOTOR_PCLK 0x2064
#define CLK_CON_GAT_GOUT_PERI_SPI_0_IPCLK 0x209c
#define CLK_CON_GAT_GOUT_PERI_SPI_0_PCLK 0x20a0
#define CLK_CON_GAT_GOUT_PERI_SYSREG_PERI_PCLK 0x20a4
#define CLK_CON_GAT_GOUT_PERI_UART_IPCLK 0x20a8
#define CLK_CON_GAT_GOUT_PERI_UART_PCLK 0x20ac
#define CLK_CON_GAT_GOUT_PERI_WDT_0_PCLK 0x20b0
#define CLK_CON_GAT_GOUT_PERI_WDT_1_PCLK 0x20b4
static const unsigned long peri_clk_regs[] __initconst = {
PLL_CON0_MUX_CLKCMU_PERI_BUS_USER,
PLL_CON0_MUX_CLKCMU_PERI_HSI2C_USER,
PLL_CON0_MUX_CLKCMU_PERI_SPI_USER,
PLL_CON0_MUX_CLKCMU_PERI_UART_USER,
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_0,
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_1,
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_2,
CLK_CON_DIV_DIV_CLK_PERI_SPI_0,
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_0,
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_1,
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_2,
CLK_CON_GAT_GOUT_PERI_GPIO_PERI_PCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_0_IPCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_0_PCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_1_IPCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_1_PCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_2_IPCLK,
CLK_CON_GAT_GOUT_PERI_HSI2C_2_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_0_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_1_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_2_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_3_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_4_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_5_PCLK,
CLK_CON_GAT_GOUT_PERI_I2C_6_PCLK,
CLK_CON_GAT_GOUT_PERI_MCT_PCLK,
CLK_CON_GAT_GOUT_PERI_PWM_MOTOR_PCLK,
CLK_CON_GAT_GOUT_PERI_SPI_0_IPCLK,
CLK_CON_GAT_GOUT_PERI_SPI_0_PCLK,
CLK_CON_GAT_GOUT_PERI_SYSREG_PERI_PCLK,
CLK_CON_GAT_GOUT_PERI_UART_IPCLK,
CLK_CON_GAT_GOUT_PERI_UART_PCLK,
CLK_CON_GAT_GOUT_PERI_WDT_0_PCLK,
CLK_CON_GAT_GOUT_PERI_WDT_1_PCLK,
};
/* List of parent clocks for Muxes in CMU_PERI */
PNAME(mout_peri_bus_user_p) = { "oscclk", "dout_peri_bus" };
PNAME(mout_peri_uart_user_p) = { "oscclk", "dout_peri_uart" };
PNAME(mout_peri_hsi2c_user_p) = { "oscclk", "dout_peri_ip" };
PNAME(mout_peri_spi_user_p) = { "oscclk", "dout_peri_ip" };
static const struct samsung_mux_clock peri_mux_clks[] __initconst = {
MUX(CLK_MOUT_PERI_BUS_USER, "mout_peri_bus_user", mout_peri_bus_user_p,
PLL_CON0_MUX_CLKCMU_PERI_BUS_USER, 4, 1),
MUX(CLK_MOUT_PERI_UART_USER, "mout_peri_uart_user",
mout_peri_uart_user_p, PLL_CON0_MUX_CLKCMU_PERI_UART_USER, 4, 1),
MUX(CLK_MOUT_PERI_HSI2C_USER, "mout_peri_hsi2c_user",
mout_peri_hsi2c_user_p, PLL_CON0_MUX_CLKCMU_PERI_HSI2C_USER, 4, 1),
MUX(CLK_MOUT_PERI_SPI_USER, "mout_peri_spi_user", mout_peri_spi_user_p,
PLL_CON0_MUX_CLKCMU_PERI_SPI_USER, 4, 1),
};
static const struct samsung_div_clock peri_div_clks[] __initconst = {
DIV(CLK_DOUT_PERI_HSI2C0, "dout_peri_hsi2c0", "gout_peri_hsi2c0",
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_0, 0, 5),
DIV(CLK_DOUT_PERI_HSI2C1, "dout_peri_hsi2c1", "gout_peri_hsi2c1",
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_1, 0, 5),
DIV(CLK_DOUT_PERI_HSI2C2, "dout_peri_hsi2c2", "gout_peri_hsi2c2",
CLK_CON_DIV_DIV_CLK_PERI_HSI2C_2, 0, 5),
DIV(CLK_DOUT_PERI_SPI0, "dout_peri_spi0", "mout_peri_spi_user",
CLK_CON_DIV_DIV_CLK_PERI_SPI_0, 0, 5),
};
static const struct samsung_gate_clock peri_gate_clks[] __initconst = {
GATE(CLK_GOUT_PERI_HSI2C0, "gout_peri_hsi2c0", "mout_peri_hsi2c_user",
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_0, 21, 0, 0),
GATE(CLK_GOUT_PERI_HSI2C1, "gout_peri_hsi2c1", "mout_peri_hsi2c_user",
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_1, 21, 0, 0),
GATE(CLK_GOUT_PERI_HSI2C2, "gout_peri_hsi2c2", "mout_peri_hsi2c_user",
CLK_CON_GAT_GATE_CLK_PERI_HSI2C_2, 21, 0, 0),
GATE(CLK_GOUT_HSI2C0_IPCLK, "gout_hsi2c0_ipclk", "dout_peri_hsi2c0",
CLK_CON_GAT_GOUT_PERI_HSI2C_0_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_HSI2C0_PCLK, "gout_hsi2c0_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_HSI2C_0_PCLK, 21, 0, 0),
GATE(CLK_GOUT_HSI2C1_IPCLK, "gout_hsi2c1_ipclk", "dout_peri_hsi2c1",
CLK_CON_GAT_GOUT_PERI_HSI2C_1_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_HSI2C1_PCLK, "gout_hsi2c1_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_HSI2C_1_PCLK, 21, 0, 0),
GATE(CLK_GOUT_HSI2C2_IPCLK, "gout_hsi2c2_ipclk", "dout_peri_hsi2c2",
CLK_CON_GAT_GOUT_PERI_HSI2C_2_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_HSI2C2_PCLK, "gout_hsi2c2_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_HSI2C_2_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C0_PCLK, "gout_i2c0_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_0_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C1_PCLK, "gout_i2c1_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_1_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C2_PCLK, "gout_i2c2_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_2_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C3_PCLK, "gout_i2c3_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_3_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C4_PCLK, "gout_i2c4_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_4_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C5_PCLK, "gout_i2c5_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_5_PCLK, 21, 0, 0),
GATE(CLK_GOUT_I2C6_PCLK, "gout_i2c6_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_I2C_6_PCLK, 21, 0, 0),
GATE(CLK_GOUT_MCT_PCLK, "gout_mct_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_MCT_PCLK, 21, 0, 0),
GATE(CLK_GOUT_PWM_MOTOR_PCLK, "gout_pwm_motor_pclk",
"mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_PWM_MOTOR_PCLK, 21, 0, 0),
GATE(CLK_GOUT_SPI0_IPCLK, "gout_spi0_ipclk", "dout_peri_spi0",
CLK_CON_GAT_GOUT_PERI_SPI_0_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_SPI0_PCLK, "gout_spi0_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_SPI_0_PCLK, 21, 0, 0),
GATE(CLK_GOUT_SYSREG_PERI_PCLK, "gout_sysreg_peri_pclk",
"mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_SYSREG_PERI_PCLK, 21, 0, 0),
GATE(CLK_GOUT_UART_IPCLK, "gout_uart_ipclk", "mout_peri_uart_user",
CLK_CON_GAT_GOUT_PERI_UART_IPCLK, 21, 0, 0),
GATE(CLK_GOUT_UART_PCLK, "gout_uart_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_UART_PCLK, 21, 0, 0),
GATE(CLK_GOUT_WDT0_PCLK, "gout_wdt0_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_WDT_0_PCLK, 21, 0, 0),
GATE(CLK_GOUT_WDT1_PCLK, "gout_wdt1_pclk", "mout_peri_bus_user",
CLK_CON_GAT_GOUT_PERI_WDT_1_PCLK, 21, 0, 0),
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_GPIO_PERI_PCLK, "gout_gpio_peri_pclk",
"mout_peri_bus_user",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
CLK_CON_GAT_GOUT_PERI_GPIO_PERI_PCLK, 21, CLK_IGNORE_UNUSED, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
};
static const struct samsung_cmu_info peri_cmu_info __initconst = {
.mux_clks = peri_mux_clks,
.nr_mux_clks = ARRAY_SIZE(peri_mux_clks),
.div_clks = peri_div_clks,
.nr_div_clks = ARRAY_SIZE(peri_div_clks),
.gate_clks = peri_gate_clks,
.nr_gate_clks = ARRAY_SIZE(peri_gate_clks),
.nr_clk_ids = PERI_NR_CLK,
.clk_regs = peri_clk_regs,
.nr_clk_regs = ARRAY_SIZE(peri_clk_regs),
.clk_name = "dout_peri_bus",
};
clk: samsung: exynos850: Register clocks early Some clocks must be registered before init calls. For example MCT clock (from CMU_PERI) is needed for MCT timer driver, which is registered with TIMER_OF_DECLARE(). By the time we get to core_initcall() used for clk-exynos850 platform driver init, it's already too late. Inability to get "mct" clock in MCT driver leads to kernel panic, as functions registered with *_OF_DECLARE() can't do deferred calls. MCT timer driver can't be fixed either, as it's acting as a clock source and it's essential to register it in start_kernel() -> time_init(). Let's register CMU_PERI clocks early, using CLK_OF_DECLARE(). CMU_TOP generates clocks needed for CMU_PERI, but it's already registered early. While at it, let's cleanup the code a bit, by extracting everything related to CMU initialization and registration to the separate function. Similar issue was discussed at [1] and addressed in commit 1f7db7bbf031 ("clk: renesas: cpg-mssr: Add early clock support"), as well as in drivers/clk/mediatek/clk-mt2712.c. [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20180829132954.64862-2-chris.brandt@renesas.com/ Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211122144206.23134-1-semen.protsenko@linaro.org
2021-11-22 22:42:06 +08:00
static void __init exynos850_cmu_peri_init(struct device_node *np)
{
clk: samsung: Make exynos850_register_cmu shared Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it to a new file called "clk-exynos-arm64.c". This should have no functional changes, but it will allow this code to be shared between other arm64 Exynos SoCs, like the Exynos7885 and possibly ExynosAuto V9. Signed-off-by: David Virag <virag.david003@gmail.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211206153124.427102-5-virag.david003@gmail.com
2021-12-06 23:31:18 +08:00
exynos_arm64_register_cmu(NULL, np, &peri_cmu_info);
clk: samsung: exynos850: Register clocks early Some clocks must be registered before init calls. For example MCT clock (from CMU_PERI) is needed for MCT timer driver, which is registered with TIMER_OF_DECLARE(). By the time we get to core_initcall() used for clk-exynos850 platform driver init, it's already too late. Inability to get "mct" clock in MCT driver leads to kernel panic, as functions registered with *_OF_DECLARE() can't do deferred calls. MCT timer driver can't be fixed either, as it's acting as a clock source and it's essential to register it in start_kernel() -> time_init(). Let's register CMU_PERI clocks early, using CLK_OF_DECLARE(). CMU_TOP generates clocks needed for CMU_PERI, but it's already registered early. While at it, let's cleanup the code a bit, by extracting everything related to CMU initialization and registration to the separate function. Similar issue was discussed at [1] and addressed in commit 1f7db7bbf031 ("clk: renesas: cpg-mssr: Add early clock support"), as well as in drivers/clk/mediatek/clk-mt2712.c. [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20180829132954.64862-2-chris.brandt@renesas.com/ Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211122144206.23134-1-semen.protsenko@linaro.org
2021-11-22 22:42:06 +08:00
}
/* Register CMU_PERI early, as it's needed for MCT timer */
CLK_OF_DECLARE(exynos850_cmu_peri, "samsung,exynos850-cmu-peri",
exynos850_cmu_peri_init);
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
/* ---- CMU_CORE ------------------------------------------------------------ */
/* Register Offset definitions for CMU_CORE (0x12000000) */
#define PLL_CON0_MUX_CLKCMU_CORE_BUS_USER 0x0600
#define PLL_CON0_MUX_CLKCMU_CORE_CCI_USER 0x0610
#define PLL_CON0_MUX_CLKCMU_CORE_MMC_EMBD_USER 0x0620
#define PLL_CON0_MUX_CLKCMU_CORE_SSS_USER 0x0630
#define CLK_CON_MUX_MUX_CLK_CORE_GIC 0x1000
#define CLK_CON_DIV_DIV_CLK_CORE_BUSP 0x1800
#define CLK_CON_GAT_GOUT_CORE_CCI_550_ACLK 0x2038
#define CLK_CON_GAT_GOUT_CORE_GIC_CLK 0x2040
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
#define CLK_CON_GAT_GOUT_CORE_GPIO_CORE_PCLK 0x2044
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
#define CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK 0x20e8
#define CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN 0x20ec
#define CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK 0x2128
#define CLK_CON_GAT_GOUT_CORE_SSS_I_PCLK 0x212c
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
#define CLK_CON_GAT_GOUT_CORE_SYSREG_CORE_PCLK 0x2130
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
static const unsigned long core_clk_regs[] __initconst = {
PLL_CON0_MUX_CLKCMU_CORE_BUS_USER,
PLL_CON0_MUX_CLKCMU_CORE_CCI_USER,
PLL_CON0_MUX_CLKCMU_CORE_MMC_EMBD_USER,
PLL_CON0_MUX_CLKCMU_CORE_SSS_USER,
CLK_CON_MUX_MUX_CLK_CORE_GIC,
CLK_CON_DIV_DIV_CLK_CORE_BUSP,
CLK_CON_GAT_GOUT_CORE_CCI_550_ACLK,
CLK_CON_GAT_GOUT_CORE_GIC_CLK,
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
CLK_CON_GAT_GOUT_CORE_GPIO_CORE_PCLK,
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK,
CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN,
CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK,
CLK_CON_GAT_GOUT_CORE_SSS_I_PCLK,
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
CLK_CON_GAT_GOUT_CORE_SYSREG_CORE_PCLK,
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
};
/* List of parent clocks for Muxes in CMU_CORE */
PNAME(mout_core_bus_user_p) = { "oscclk", "dout_core_bus" };
PNAME(mout_core_cci_user_p) = { "oscclk", "dout_core_cci" };
PNAME(mout_core_mmc_embd_user_p) = { "oscclk", "dout_core_mmc_embd" };
PNAME(mout_core_sss_user_p) = { "oscclk", "dout_core_sss" };
PNAME(mout_core_gic_p) = { "dout_core_busp", "oscclk" };
static const struct samsung_mux_clock core_mux_clks[] __initconst = {
MUX(CLK_MOUT_CORE_BUS_USER, "mout_core_bus_user", mout_core_bus_user_p,
PLL_CON0_MUX_CLKCMU_CORE_BUS_USER, 4, 1),
MUX(CLK_MOUT_CORE_CCI_USER, "mout_core_cci_user", mout_core_cci_user_p,
PLL_CON0_MUX_CLKCMU_CORE_CCI_USER, 4, 1),
MUX_F(CLK_MOUT_CORE_MMC_EMBD_USER, "mout_core_mmc_embd_user",
mout_core_mmc_embd_user_p, PLL_CON0_MUX_CLKCMU_CORE_MMC_EMBD_USER,
4, 1, CLK_SET_RATE_PARENT, 0),
MUX(CLK_MOUT_CORE_SSS_USER, "mout_core_sss_user", mout_core_sss_user_p,
PLL_CON0_MUX_CLKCMU_CORE_SSS_USER, 4, 1),
MUX(CLK_MOUT_CORE_GIC, "mout_core_gic", mout_core_gic_p,
CLK_CON_MUX_MUX_CLK_CORE_GIC, 0, 1),
};
static const struct samsung_div_clock core_div_clks[] __initconst = {
DIV(CLK_DOUT_CORE_BUSP, "dout_core_busp", "mout_core_bus_user",
CLK_CON_DIV_DIV_CLK_CORE_BUSP, 0, 2),
};
static const struct samsung_gate_clock core_gate_clks[] __initconst = {
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
/* CCI (interconnect) clock must be always running */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_CCI_ACLK, "gout_cci_aclk", "mout_core_cci_user",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
CLK_CON_GAT_GOUT_CORE_CCI_550_ACLK, 21, CLK_IS_CRITICAL, 0),
/* GIC (interrupt controller) clock must be always running */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_GIC_CLK, "gout_gic_clk", "mout_core_gic",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
CLK_CON_GAT_GOUT_CORE_GIC_CLK, 21, CLK_IS_CRITICAL, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_MMC_EMBD_ACLK, "gout_mmc_embd_aclk", "dout_core_busp",
CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK, 21, 0, 0),
GATE(CLK_GOUT_MMC_EMBD_SDCLKIN, "gout_mmc_embd_sdclkin",
"mout_core_mmc_embd_user", CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN,
21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_SSS_ACLK, "gout_sss_aclk", "mout_core_sss_user",
CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK, 21, 0, 0),
GATE(CLK_GOUT_SSS_PCLK, "gout_sss_pclk", "dout_core_busp",
CLK_CON_GAT_GOUT_CORE_SSS_I_PCLK, 21, 0, 0),
clk: samsung: exynos850: Add missing sysreg clocks System Register is used to configure system behavior, like USI protocol, etc. SYSREG clocks should be provided to corresponding syscon nodes, to make it possible to modify SYSREG registers. While at it, add also missing PMU and GPIO clocks, which looks necessary and might be needed for corresponding Exynos850 features soon. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211217161549.24836-3-semen.protsenko@linaro.org
2021-12-18 00:15:44 +08:00
/* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */
GATE(CLK_GOUT_GPIO_CORE_PCLK, "gout_gpio_core_pclk", "dout_core_busp",
CLK_CON_GAT_GOUT_CORE_GPIO_CORE_PCLK, 21, CLK_IGNORE_UNUSED, 0),
GATE(CLK_GOUT_SYSREG_CORE_PCLK, "gout_sysreg_core_pclk",
"dout_core_busp",
CLK_CON_GAT_GOUT_CORE_SYSREG_CORE_PCLK, 21, 0, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
};
static const struct samsung_cmu_info core_cmu_info __initconst = {
.mux_clks = core_mux_clks,
.nr_mux_clks = ARRAY_SIZE(core_mux_clks),
.div_clks = core_div_clks,
.nr_div_clks = ARRAY_SIZE(core_div_clks),
.gate_clks = core_gate_clks,
.nr_gate_clks = ARRAY_SIZE(core_gate_clks),
.nr_clk_ids = CORE_NR_CLK,
.clk_regs = core_clk_regs,
.nr_clk_regs = ARRAY_SIZE(core_clk_regs),
.clk_name = "dout_core_bus",
};
/* ---- CMU_DPU ------------------------------------------------------------- */
/* Register Offset definitions for CMU_DPU (0x13000000) */
#define PLL_CON0_MUX_CLKCMU_DPU_USER 0x0600
#define CLK_CON_DIV_DIV_CLK_DPU_BUSP 0x1800
#define CLK_CON_GAT_CLK_DPU_CMU_DPU_PCLK 0x2004
#define CLK_CON_GAT_GOUT_DPU_ACLK_DECON0 0x2010
#define CLK_CON_GAT_GOUT_DPU_ACLK_DMA 0x2014
#define CLK_CON_GAT_GOUT_DPU_ACLK_DPP 0x2018
#define CLK_CON_GAT_GOUT_DPU_PPMU_ACLK 0x2028
#define CLK_CON_GAT_GOUT_DPU_PPMU_PCLK 0x202c
#define CLK_CON_GAT_GOUT_DPU_SMMU_CLK 0x2038
#define CLK_CON_GAT_GOUT_DPU_SYSREG_PCLK 0x203c
static const unsigned long dpu_clk_regs[] __initconst = {
PLL_CON0_MUX_CLKCMU_DPU_USER,
CLK_CON_DIV_DIV_CLK_DPU_BUSP,
CLK_CON_GAT_CLK_DPU_CMU_DPU_PCLK,
CLK_CON_GAT_GOUT_DPU_ACLK_DECON0,
CLK_CON_GAT_GOUT_DPU_ACLK_DMA,
CLK_CON_GAT_GOUT_DPU_ACLK_DPP,
CLK_CON_GAT_GOUT_DPU_PPMU_ACLK,
CLK_CON_GAT_GOUT_DPU_PPMU_PCLK,
CLK_CON_GAT_GOUT_DPU_SMMU_CLK,
CLK_CON_GAT_GOUT_DPU_SYSREG_PCLK,
};
/* List of parent clocks for Muxes in CMU_CORE */
PNAME(mout_dpu_user_p) = { "oscclk", "dout_dpu" };
static const struct samsung_mux_clock dpu_mux_clks[] __initconst = {
MUX(CLK_MOUT_DPU_USER, "mout_dpu_user", mout_dpu_user_p,
PLL_CON0_MUX_CLKCMU_DPU_USER, 4, 1),
};
static const struct samsung_div_clock dpu_div_clks[] __initconst = {
DIV(CLK_DOUT_DPU_BUSP, "dout_dpu_busp", "mout_dpu_user",
CLK_CON_DIV_DIV_CLK_DPU_BUSP, 0, 3),
};
static const struct samsung_gate_clock dpu_gate_clks[] __initconst = {
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
/* TODO: Should be enabled in DSIM driver */
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_DPU_CMU_DPU_PCLK, "gout_dpu_cmu_dpu_pclk",
clk: samsung: exynos850: Keep some crucial clocks running Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-7-semen.protsenko@linaro.org
2021-11-22 07:27:41 +08:00
"dout_dpu_busp",
CLK_CON_GAT_CLK_DPU_CMU_DPU_PCLK, 21, CLK_IGNORE_UNUSED, 0),
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
GATE(CLK_GOUT_DPU_DECON0_ACLK, "gout_dpu_decon0_aclk", "mout_dpu_user",
CLK_CON_GAT_GOUT_DPU_ACLK_DECON0, 21, 0, 0),
GATE(CLK_GOUT_DPU_DMA_ACLK, "gout_dpu_dma_aclk", "mout_dpu_user",
CLK_CON_GAT_GOUT_DPU_ACLK_DMA, 21, 0, 0),
GATE(CLK_GOUT_DPU_DPP_ACLK, "gout_dpu_dpp_aclk", "mout_dpu_user",
CLK_CON_GAT_GOUT_DPU_ACLK_DPP, 21, 0, 0),
GATE(CLK_GOUT_DPU_PPMU_ACLK, "gout_dpu_ppmu_aclk", "mout_dpu_user",
CLK_CON_GAT_GOUT_DPU_PPMU_ACLK, 21, 0, 0),
GATE(CLK_GOUT_DPU_PPMU_PCLK, "gout_dpu_ppmu_pclk", "dout_dpu_busp",
CLK_CON_GAT_GOUT_DPU_PPMU_PCLK, 21, 0, 0),
GATE(CLK_GOUT_DPU_SMMU_CLK, "gout_dpu_smmu_clk", "mout_dpu_user",
CLK_CON_GAT_GOUT_DPU_SMMU_CLK, 21, 0, 0),
GATE(CLK_GOUT_DPU_SYSREG_PCLK, "gout_dpu_sysreg_pclk", "dout_dpu_busp",
CLK_CON_GAT_GOUT_DPU_SYSREG_PCLK, 21, 0, 0),
};
static const struct samsung_cmu_info dpu_cmu_info __initconst = {
.mux_clks = dpu_mux_clks,
.nr_mux_clks = ARRAY_SIZE(dpu_mux_clks),
.div_clks = dpu_div_clks,
.nr_div_clks = ARRAY_SIZE(dpu_div_clks),
.gate_clks = dpu_gate_clks,
.nr_gate_clks = ARRAY_SIZE(dpu_gate_clks),
.nr_clk_ids = DPU_NR_CLK,
.clk_regs = dpu_clk_regs,
.nr_clk_regs = ARRAY_SIZE(dpu_clk_regs),
.clk_name = "dout_dpu",
};
/* ---- platform_driver ----------------------------------------------------- */
static int __init exynos850_cmu_probe(struct platform_device *pdev)
{
const struct samsung_cmu_info *info;
struct device *dev = &pdev->dev;
info = of_device_get_match_data(dev);
clk: samsung: Make exynos850_register_cmu shared Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it to a new file called "clk-exynos-arm64.c". This should have no functional changes, but it will allow this code to be shared between other arm64 Exynos SoCs, like the Exynos7885 and possibly ExynosAuto V9. Signed-off-by: David Virag <virag.david003@gmail.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211206153124.427102-5-virag.david003@gmail.com
2021-12-06 23:31:18 +08:00
exynos_arm64_register_cmu(dev, dev->of_node, info);
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
return 0;
}
static const struct of_device_id exynos850_cmu_of_match[] = {
{
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
.compatible = "samsung,exynos850-cmu-apm",
.data = &apm_cmu_info,
clk: samsung: exynos850: Implement CMU_CMGP domain CMU_CMGP clock domain provides clocks for CMGP IP-core (Common GPIO). CMGP module encapsulates next blocks: - 8 GPIO lines - 1 GPADC - 2 USI blocks, each can be configured to provide one of UART/SPI/HSI2C serial interfaces Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211121232741.6967-5-semen.protsenko@linaro.org
2021-11-22 07:27:39 +08:00
}, {
.compatible = "samsung,exynos850-cmu-cmgp",
.data = &cmgp_cmu_info,
clk: samsung: exynos850: Implement CMU_APM domain CMU_APM clock domain provides clocks for APM IP-core (Active Power Management). According to Exynos850 TRM, CMU_APM generates I3C, Mailbox, Speedy, Timer, WDT, RTC and PMU clocks for BLK_ALIVE. This patch adds next clocks: - bus clocks in CMU_TOP needed for CMU_APM - all internal CMU_APM clocks - leaf clocks for I3C, Speedy and RTC IP-cores - bus clocks for CMU_CMGP and CMU_CHUB CMU_APM doesn't belong to Power Domains, but platform driver is used for its registration to keep its bus clock always running. Otherwise rtc-s3c driver disables that clock and system freezes. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211121232741.6967-3-semen.protsenko@linaro.org
2021-11-22 07:27:37 +08:00
}, {
clk: samsung: Introduce Exynos850 clock driver This is the initial implementation adding only basic clocks like UART, MMC, I2C and corresponding parent clocks. Design is influenced by Exynos5433 clock driver. Bus clock is enabled by default (in probe function) for all CMUs except CMU_TOP, the reasoning is as follows. By default if bus clock has no users its "enable count" value is 0. It might be actually running if it's already enabled in bootloader, but then in some cases it can be disabled by mistake. For example, such case was observed when dw_mci_probe() enabled the bus clock, then failed to do something and disabled that bus clock on error path. After that, even the attempt to read the 'clk_summary' file in DebugFS freezed forever, as CMU bus clock ended up being disabled and it wasn't possible to access CMU registers anymore. To avoid such cases, CMU driver must increment the ref count for that bus clock by running clk_prepare_enable(). There is already existing '.clk_name' field in struct samsung_cmu_info, exactly for that reason. It was added in commit 523d3de41f02 ("clk: samsung: exynos5433: Add support for runtime PM"), with next mentioning in commit message: > Also for each CMU there is one special parent clock, which has to be > enabled all the time when any access to CMU registers is being done. But that clock is actually only enabled in Exynos5433 clock driver right now. So the same code is added to exynos850_cmu_probe() function, As was described above, it might be helpful not only for PM reasons, but also to prevent possible erroneous clock gating on error paths. Another way to workaround that issue would be to use CLOCK_IS_CRITICAL flag for corresponding gate clocks. But that might be not very good design decision, as we might still want to disable that bus clock, e.g. on PM suspend. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20211008154352.19519-6-semen.protsenko@linaro.org Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2021-10-08 23:43:52 +08:00
.compatible = "samsung,exynos850-cmu-hsi",
.data = &hsi_cmu_info,
}, {
.compatible = "samsung,exynos850-cmu-core",
.data = &core_cmu_info,
}, {
.compatible = "samsung,exynos850-cmu-dpu",
.data = &dpu_cmu_info,
}, {
},
};
static struct platform_driver exynos850_cmu_driver __refdata = {
.driver = {
.name = "exynos850-cmu",
.of_match_table = exynos850_cmu_of_match,
.suppress_bind_attrs = true,
},
.probe = exynos850_cmu_probe,
};
static int __init exynos850_cmu_init(void)
{
return platform_driver_register(&exynos850_cmu_driver);
}
core_initcall(exynos850_cmu_init);