From e3aabb3c7dbe66201b45d7b2c20132196f491ad4 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Wed, 22 Dec 2021 07:32:14 +0300 Subject: [PATCH 1/3] memory: tegra30-emc: Print additional memory info Print out memory type and LPDDR2 configuration on Tegra30, making it similar to the memory info printed by the Tegra20 memory driver. This info is useful for debugging purposes. Tested-by: Svyatoslav Ryhel # T30 ASUS TF201 LPDDR2 Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211222043215.28237-1-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski --- drivers/memory/tegra/Kconfig | 1 + drivers/memory/tegra/tegra30-emc.c | 131 ++++++++++++++++++++++++++--- 2 files changed, 122 insertions(+), 10 deletions(-) diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig index 7951764b4efe..3fe83d7c2bf8 100644 --- a/drivers/memory/tegra/Kconfig +++ b/drivers/memory/tegra/Kconfig @@ -28,6 +28,7 @@ config TEGRA30_EMC default y depends on ARCH_TEGRA_3x_SOC || COMPILE_TEST select PM_OPP + select DDR help This driver is for the External Memory Controller (EMC) found on Tegra30 chips. The EMC controls the external DRAM on the board. diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c index 80f98d717e13..9ba2a9e5316b 100644 --- a/drivers/memory/tegra/tegra30-emc.c +++ b/drivers/memory/tegra/tegra30-emc.c @@ -9,6 +9,7 @@ * Copyright (C) 2019 GRATE-DRIVER project */ +#include #include #include #include @@ -31,11 +32,15 @@ #include #include +#include "../jedec_ddr.h" +#include "../of_memory.h" + #include "mc.h" #define EMC_INTSTATUS 0x000 #define EMC_INTMASK 0x004 #define EMC_DBG 0x008 +#define EMC_ADR_CFG 0x010 #define EMC_CFG 0x00c #define EMC_REFCTRL 0x020 #define EMC_TIMING_CONTROL 0x028 @@ -81,6 +86,7 @@ #define EMC_EMRS 0x0d0 #define EMC_SELF_REF 0x0e0 #define EMC_MRW 0x0e8 +#define EMC_MRR 0x0ec #define EMC_XM2DQSPADCTRL3 0x0f8 #define EMC_FBIO_SPARE 0x100 #define EMC_FBIO_CFG5 0x104 @@ -208,6 +214,13 @@ #define EMC_REFRESH_OVERFLOW_INT BIT(3) #define EMC_CLKCHANGE_COMPLETE_INT BIT(4) +#define EMC_MRR_DIVLD_INT BIT(5) + +#define EMC_MRR_DEV_SELECTN GENMASK(31, 30) +#define EMC_MRR_MRR_MA GENMASK(23, 16) +#define EMC_MRR_MRR_DATA GENMASK(15, 0) + +#define EMC_ADR_CFG_EMEM_NUMDEV BIT(0) enum emc_dram_type { DRAM_TYPE_DDR3, @@ -378,6 +391,8 @@ struct tegra_emc { /* protect shared rate-change code path */ struct mutex rate_lock; + + bool mrr_error; }; static int emc_seq_update_timing(struct tegra_emc *emc) @@ -1008,12 +1023,18 @@ static int emc_load_timings_from_dt(struct tegra_emc *emc, return 0; } -static struct device_node *emc_find_node_by_ram_code(struct device *dev) +static struct device_node *emc_find_node_by_ram_code(struct tegra_emc *emc) { + struct device *dev = emc->dev; struct device_node *np; u32 value, ram_code; int err; + if (emc->mrr_error) { + dev_warn(dev, "memory timings skipped due to MRR error\n"); + return NULL; + } + if (of_get_child_count(dev->of_node) == 0) { dev_info_once(dev, "device-tree doesn't have memory timings\n"); return NULL; @@ -1035,11 +1056,73 @@ static struct device_node *emc_find_node_by_ram_code(struct device *dev) return NULL; } +static int emc_read_lpddr_mode_register(struct tegra_emc *emc, + unsigned int emem_dev, + unsigned int register_addr, + unsigned int *register_data) +{ + u32 memory_dev = emem_dev ? 1 : 2; + u32 val, mr_mask = 0xff; + int err; + + /* clear data-valid interrupt status */ + writel_relaxed(EMC_MRR_DIVLD_INT, emc->regs + EMC_INTSTATUS); + + /* issue mode register read request */ + val = FIELD_PREP(EMC_MRR_DEV_SELECTN, memory_dev); + val |= FIELD_PREP(EMC_MRR_MRR_MA, register_addr); + + writel_relaxed(val, emc->regs + EMC_MRR); + + /* wait for the LPDDR2 data-valid interrupt */ + err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_INTSTATUS, val, + val & EMC_MRR_DIVLD_INT, + 1, 100); + if (err) { + dev_err(emc->dev, "mode register %u read failed: %d\n", + register_addr, err); + emc->mrr_error = true; + return err; + } + + /* read out mode register data */ + val = readl_relaxed(emc->regs + EMC_MRR); + *register_data = FIELD_GET(EMC_MRR_MRR_DATA, val) & mr_mask; + + return 0; +} + +static void emc_read_lpddr_sdram_info(struct tegra_emc *emc, + unsigned int emem_dev) +{ + union lpddr2_basic_config4 basic_conf4; + unsigned int manufacturer_id; + unsigned int revision_id1; + unsigned int revision_id2; + + /* these registers are standard for all LPDDR JEDEC memory chips */ + emc_read_lpddr_mode_register(emc, emem_dev, 5, &manufacturer_id); + emc_read_lpddr_mode_register(emc, emem_dev, 6, &revision_id1); + emc_read_lpddr_mode_register(emc, emem_dev, 7, &revision_id2); + emc_read_lpddr_mode_register(emc, emem_dev, 8, &basic_conf4.value); + + dev_info(emc->dev, "SDRAM[dev%u]: manufacturer: 0x%x (%s) rev1: 0x%x rev2: 0x%x prefetch: S%u density: %uMbit iowidth: %ubit\n", + emem_dev, manufacturer_id, + lpddr2_jedec_manufacturer(manufacturer_id), + revision_id1, revision_id2, + 4 >> basic_conf4.arch_type, + 64 << basic_conf4.density, + 32 >> basic_conf4.io_width); +} + static int emc_setup_hw(struct tegra_emc *emc) { + u32 fbio_cfg5, emc_cfg, emc_dbg, emc_adr_cfg; u32 intmask = EMC_REFRESH_OVERFLOW_INT; - u32 fbio_cfg5, emc_cfg, emc_dbg; + static bool print_sdram_info_once; enum emc_dram_type dram_type; + const char *dram_type_str; + unsigned int emem_numdev; fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5); dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK; @@ -1076,6 +1159,34 @@ static int emc_setup_hw(struct tegra_emc *emc) emc_dbg &= ~EMC_DBG_FORCE_UPDATE; writel_relaxed(emc_dbg, emc->regs + EMC_DBG); + switch (dram_type) { + case DRAM_TYPE_DDR1: + dram_type_str = "DDR1"; + break; + case DRAM_TYPE_LPDDR2: + dram_type_str = "LPDDR2"; + break; + case DRAM_TYPE_DDR2: + dram_type_str = "DDR2"; + break; + case DRAM_TYPE_DDR3: + dram_type_str = "DDR3"; + break; + } + + emc_adr_cfg = readl_relaxed(emc->regs + EMC_ADR_CFG); + emem_numdev = FIELD_GET(EMC_ADR_CFG_EMEM_NUMDEV, emc_adr_cfg) + 1; + + dev_info_once(emc->dev, "%u %s %s attached\n", emem_numdev, + dram_type_str, emem_numdev == 2 ? "devices" : "device"); + + if (dram_type == DRAM_TYPE_LPDDR2 && !print_sdram_info_once) { + while (emem_numdev--) + emc_read_lpddr_sdram_info(emc, emem_numdev); + + print_sdram_info_once = true; + } + return 0; } @@ -1538,14 +1649,6 @@ static int tegra_emc_probe(struct platform_device *pdev) emc->clk_nb.notifier_call = emc_clk_change_notify; emc->dev = &pdev->dev; - np = emc_find_node_by_ram_code(&pdev->dev); - if (np) { - err = emc_load_timings_from_dt(emc, np); - of_node_put(np); - if (err) - return err; - } - emc->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(emc->regs)) return PTR_ERR(emc->regs); @@ -1554,6 +1657,14 @@ static int tegra_emc_probe(struct platform_device *pdev) if (err) return err; + np = emc_find_node_by_ram_code(emc); + if (np) { + err = emc_load_timings_from_dt(emc, np); + of_node_put(np); + if (err) + return err; + } + err = platform_get_irq(pdev, 0); if (err < 0) return err; From 9ff684342ee7d3ea2755c6e9b60bc43085baa3ad Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Wed, 22 Dec 2021 07:32:15 +0300 Subject: [PATCH 2/3] memory: tegra20-emc: Correct memory device mask Memory chip select is swapped when we read mode register, correct it. We didn't have devices that use a single LPDDR chip and both chips are always identical, hence this change is just a minor improvement. Fixes: 131dd9a436d8 ("memory: tegra20-emc: Support matching timings by LPDDR2 configuration") Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211222043215.28237-2-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski --- drivers/memory/tegra/tegra20-emc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index 497b6edbf3ca..25ba3c5e4ad6 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -540,7 +540,7 @@ static int emc_read_lpddr_mode_register(struct tegra_emc *emc, unsigned int register_addr, unsigned int *register_data) { - u32 memory_dev = emem_dev + 1; + u32 memory_dev = emem_dev ? 1 : 2; u32 val, mr_mask = 0xff; int err; From 0123af535b9c090cf05dcf500f9303bae5849691 Mon Sep 17 00:00:00 2001 From: Rikard Falkeborn Date: Sun, 28 Nov 2021 21:41:58 +0100 Subject: [PATCH 3/3] memory: tegra: Constify struct thermal_cooling_device_ops The only usage of tegra210_emc_cd_ops is to pass its address to devm_thermal_of_cooling_device_register() which is a pointer to const struct thermal_cooling_device_ops. Make it const to allow the compiler to put it in read-only memory. Signed-off-by: Rikard Falkeborn Link: https://lore.kernel.org/r/20211128204158.19544-1-rikard.falkeborn@gmail.com Signed-off-by: Krzysztof Kozlowski --- drivers/memory/tegra/tegra210-emc-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/memory/tegra/tegra210-emc-core.c b/drivers/memory/tegra/tegra210-emc-core.c index 13584f9317a4..cbe1a7723514 100644 --- a/drivers/memory/tegra/tegra210-emc-core.c +++ b/drivers/memory/tegra/tegra210-emc-core.c @@ -711,7 +711,7 @@ static int tegra210_emc_cd_set_state(struct thermal_cooling_device *cd, return 0; } -static struct thermal_cooling_device_ops tegra210_emc_cd_ops = { +static const struct thermal_cooling_device_ops tegra210_emc_cd_ops = { .get_max_state = tegra210_emc_cd_max_state, .get_cur_state = tegra210_emc_cd_get_state, .set_cur_state = tegra210_emc_cd_set_state,