297 lines
10 KiB
C
297 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017, Impinj, Inc.
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*
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* i.MX7 System Reset Controller (SRC) driver
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/regmap.h>
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#include <dt-bindings/reset/imx7-reset.h>
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#include <dt-bindings/reset/imx8mq-reset.h>
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struct imx7_src_signal {
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unsigned int offset, bit;
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};
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struct imx7_src_variant {
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const struct imx7_src_signal *signals;
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unsigned int signals_num;
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struct reset_control_ops ops;
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};
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struct imx7_src {
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struct reset_controller_dev rcdev;
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struct regmap *regmap;
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const struct imx7_src_signal *signals;
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};
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enum imx7_src_registers {
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SRC_A7RCR0 = 0x0004,
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SRC_M4RCR = 0x000c,
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SRC_ERCR = 0x0014,
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SRC_HSICPHY_RCR = 0x001c,
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SRC_USBOPHY1_RCR = 0x0020,
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SRC_USBOPHY2_RCR = 0x0024,
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SRC_MIPIPHY_RCR = 0x0028,
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SRC_PCIEPHY_RCR = 0x002c,
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SRC_DDRC_RCR = 0x1000,
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};
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static int imx7_reset_update(struct imx7_src *imx7src,
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unsigned long id, unsigned int value)
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{
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const struct imx7_src_signal *signal = &imx7src->signals[id];
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return regmap_update_bits(imx7src->regmap,
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signal->offset, signal->bit, value);
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}
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static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
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[IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
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[IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
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[IMX7_RESET_A7_CORE_RESET0] = { SRC_A7RCR0, BIT(4) },
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[IMX7_RESET_A7_CORE_RESET1] = { SRC_A7RCR0, BIT(5) },
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[IMX7_RESET_A7_DBG_RESET0] = { SRC_A7RCR0, BIT(8) },
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[IMX7_RESET_A7_DBG_RESET1] = { SRC_A7RCR0, BIT(9) },
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[IMX7_RESET_A7_ETM_RESET0] = { SRC_A7RCR0, BIT(12) },
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[IMX7_RESET_A7_ETM_RESET1] = { SRC_A7RCR0, BIT(13) },
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[IMX7_RESET_A7_SOC_DBG_RESET] = { SRC_A7RCR0, BIT(20) },
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[IMX7_RESET_A7_L2RESET] = { SRC_A7RCR0, BIT(21) },
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[IMX7_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
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[IMX7_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
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[IMX7_RESET_EIM_RST] = { SRC_ERCR, BIT(0) },
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[IMX7_RESET_HSICPHY_PORT_RST] = { SRC_HSICPHY_RCR, BIT(1) },
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[IMX7_RESET_USBPHY1_POR] = { SRC_USBOPHY1_RCR, BIT(0) },
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[IMX7_RESET_USBPHY1_PORT_RST] = { SRC_USBOPHY1_RCR, BIT(1) },
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[IMX7_RESET_USBPHY2_POR] = { SRC_USBOPHY2_RCR, BIT(0) },
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[IMX7_RESET_USBPHY2_PORT_RST] = { SRC_USBOPHY2_RCR, BIT(1) },
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[IMX7_RESET_MIPI_PHY_MRST] = { SRC_MIPIPHY_RCR, BIT(1) },
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[IMX7_RESET_MIPI_PHY_SRST] = { SRC_MIPIPHY_RCR, BIT(2) },
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[IMX7_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
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[IMX7_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
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[IMX7_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
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[IMX7_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
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[IMX7_RESET_DDRC_PRST] = { SRC_DDRC_RCR, BIT(0) },
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[IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
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};
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static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct imx7_src, rcdev);
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}
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static int imx7_reset_set(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct imx7_src *imx7src = to_imx7_src(rcdev);
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const unsigned int bit = imx7src->signals[id].bit;
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unsigned int value = assert ? bit : 0;
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switch (id) {
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case IMX7_RESET_PCIEPHY:
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/*
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* wait for more than 10us to release phy g_rst and
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* btnrst
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*/
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if (!assert)
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udelay(10);
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break;
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case IMX7_RESET_PCIE_CTRL_APPS_EN:
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value = assert ? 0 : bit;
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break;
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}
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return imx7_reset_update(imx7src, id, value);
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}
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static int imx7_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return imx7_reset_set(rcdev, id, true);
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}
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static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return imx7_reset_set(rcdev, id, false);
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}
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static const struct imx7_src_variant variant_imx7 = {
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.signals = imx7_src_signals,
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.signals_num = ARRAY_SIZE(imx7_src_signals),
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.ops = {
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.assert = imx7_reset_assert,
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.deassert = imx7_reset_deassert,
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},
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};
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enum imx8mq_src_registers {
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SRC_A53RCR0 = 0x0004,
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SRC_HDMI_RCR = 0x0030,
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SRC_DISP_RCR = 0x0034,
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SRC_GPU_RCR = 0x0040,
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SRC_VPU_RCR = 0x0044,
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SRC_PCIE2_RCR = 0x0048,
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SRC_MIPIPHY1_RCR = 0x004c,
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SRC_MIPIPHY2_RCR = 0x0050,
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SRC_DDRC2_RCR = 0x1004,
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};
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static const struct imx7_src_signal imx8mq_src_signals[IMX8MQ_RESET_NUM] = {
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[IMX8MQ_RESET_A53_CORE_POR_RESET0] = { SRC_A53RCR0, BIT(0) },
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[IMX8MQ_RESET_A53_CORE_POR_RESET1] = { SRC_A53RCR0, BIT(1) },
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[IMX8MQ_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) },
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[IMX8MQ_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) },
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[IMX8MQ_RESET_A53_CORE_RESET0] = { SRC_A53RCR0, BIT(4) },
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[IMX8MQ_RESET_A53_CORE_RESET1] = { SRC_A53RCR0, BIT(5) },
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[IMX8MQ_RESET_A53_CORE_RESET2] = { SRC_A53RCR0, BIT(6) },
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[IMX8MQ_RESET_A53_CORE_RESET3] = { SRC_A53RCR0, BIT(7) },
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[IMX8MQ_RESET_A53_DBG_RESET0] = { SRC_A53RCR0, BIT(8) },
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[IMX8MQ_RESET_A53_DBG_RESET1] = { SRC_A53RCR0, BIT(9) },
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[IMX8MQ_RESET_A53_DBG_RESET2] = { SRC_A53RCR0, BIT(10) },
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[IMX8MQ_RESET_A53_DBG_RESET3] = { SRC_A53RCR0, BIT(11) },
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[IMX8MQ_RESET_A53_ETM_RESET0] = { SRC_A53RCR0, BIT(12) },
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[IMX8MQ_RESET_A53_ETM_RESET1] = { SRC_A53RCR0, BIT(13) },
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[IMX8MQ_RESET_A53_ETM_RESET2] = { SRC_A53RCR0, BIT(14) },
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[IMX8MQ_RESET_A53_ETM_RESET3] = { SRC_A53RCR0, BIT(15) },
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[IMX8MQ_RESET_A53_SOC_DBG_RESET] = { SRC_A53RCR0, BIT(20) },
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[IMX8MQ_RESET_A53_L2RESET] = { SRC_A53RCR0, BIT(21) },
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[IMX8MQ_RESET_SW_NON_SCLR_M4C_RST] = { SRC_M4RCR, BIT(0) },
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[IMX8MQ_RESET_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) },
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[IMX8MQ_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) },
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[IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N] = { SRC_MIPIPHY_RCR, BIT(1) },
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[IMX8MQ_RESET_MIPI_DSI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(2) },
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[IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(3) },
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[IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N] = { SRC_MIPIPHY_RCR, BIT(4) },
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[IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N] = { SRC_MIPIPHY_RCR, BIT(5) },
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[IMX8MQ_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR,
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BIT(2) | BIT(1) },
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[IMX8MQ_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
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[IMX8MQ_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
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[IMX8MQ_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
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[IMX8MQ_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) },
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[IMX8MQ_RESET_DISP_RESET] = { SRC_DISP_RCR, BIT(0) },
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[IMX8MQ_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) },
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[IMX8MQ_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) },
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[IMX8MQ_RESET_PCIEPHY2] = { SRC_PCIE2_RCR,
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BIT(2) | BIT(1) },
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[IMX8MQ_RESET_PCIEPHY2_PERST] = { SRC_PCIE2_RCR, BIT(3) },
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[IMX8MQ_RESET_PCIE2_CTRL_APPS_EN] = { SRC_PCIE2_RCR, BIT(6) },
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[IMX8MQ_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2_RCR, BIT(11) },
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[IMX8MQ_RESET_MIPI_CSI1_CORE_RESET] = { SRC_MIPIPHY1_RCR, BIT(0) },
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[IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET] = { SRC_MIPIPHY1_RCR, BIT(1) },
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[IMX8MQ_RESET_MIPI_CSI1_ESC_RESET] = { SRC_MIPIPHY1_RCR, BIT(2) },
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[IMX8MQ_RESET_MIPI_CSI2_CORE_RESET] = { SRC_MIPIPHY2_RCR, BIT(0) },
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[IMX8MQ_RESET_MIPI_CSI2_PHY_REF_RESET] = { SRC_MIPIPHY2_RCR, BIT(1) },
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[IMX8MQ_RESET_MIPI_CSI2_ESC_RESET] = { SRC_MIPIPHY2_RCR, BIT(2) },
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[IMX8MQ_RESET_DDRC1_PRST] = { SRC_DDRC_RCR, BIT(0) },
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[IMX8MQ_RESET_DDRC1_CORE_RESET] = { SRC_DDRC_RCR, BIT(1) },
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[IMX8MQ_RESET_DDRC1_PHY_RESET] = { SRC_DDRC_RCR, BIT(2) },
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[IMX8MQ_RESET_DDRC2_PHY_RESET] = { SRC_DDRC2_RCR, BIT(0) },
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[IMX8MQ_RESET_DDRC2_CORE_RESET] = { SRC_DDRC2_RCR, BIT(1) },
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[IMX8MQ_RESET_DDRC2_PRST] = { SRC_DDRC2_RCR, BIT(2) },
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};
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static int imx8mq_reset_set(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct imx7_src *imx7src = to_imx7_src(rcdev);
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const unsigned int bit = imx7src->signals[id].bit;
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unsigned int value = assert ? bit : 0;
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switch (id) {
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case IMX8MQ_RESET_PCIEPHY:
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case IMX8MQ_RESET_PCIEPHY2: /* fallthrough */
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/*
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* wait for more than 10us to release phy g_rst and
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* btnrst
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*/
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if (!assert)
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udelay(10);
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break;
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case IMX8MQ_RESET_PCIE_CTRL_APPS_EN:
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case IMX8MQ_RESET_PCIE2_CTRL_APPS_EN: /* fallthrough */
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case IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N: /* fallthrough */
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case IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N: /* fallthrough */
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case IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N: /* fallthrough */
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case IMX8MQ_RESET_MIPI_DSI_RESET_N: /* fallthrough */
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case IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N: /* fallthrough */
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value = assert ? 0 : bit;
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break;
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}
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return imx7_reset_update(imx7src, id, value);
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}
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static int imx8mq_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return imx8mq_reset_set(rcdev, id, true);
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}
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static int imx8mq_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return imx8mq_reset_set(rcdev, id, false);
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}
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static const struct imx7_src_variant variant_imx8mq = {
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.signals = imx8mq_src_signals,
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.signals_num = ARRAY_SIZE(imx8mq_src_signals),
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.ops = {
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.assert = imx8mq_reset_assert,
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.deassert = imx8mq_reset_deassert,
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},
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};
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static int imx7_reset_probe(struct platform_device *pdev)
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{
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struct imx7_src *imx7src;
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struct device *dev = &pdev->dev;
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struct regmap_config config = { .name = "src" };
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const struct imx7_src_variant *variant = of_device_get_match_data(dev);
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imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
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if (!imx7src)
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return -ENOMEM;
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imx7src->signals = variant->signals;
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imx7src->regmap = syscon_node_to_regmap(dev->of_node);
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if (IS_ERR(imx7src->regmap)) {
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dev_err(dev, "Unable to get imx7-src regmap");
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return PTR_ERR(imx7src->regmap);
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}
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regmap_attach_dev(dev, imx7src->regmap, &config);
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imx7src->rcdev.owner = THIS_MODULE;
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imx7src->rcdev.nr_resets = variant->signals_num;
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imx7src->rcdev.ops = &variant->ops;
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imx7src->rcdev.of_node = dev->of_node;
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return devm_reset_controller_register(dev, &imx7src->rcdev);
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}
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static const struct of_device_id imx7_reset_dt_ids[] = {
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{ .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
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{ .compatible = "fsl,imx8mq-src", .data = &variant_imx8mq },
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{ /* sentinel */ },
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};
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static struct platform_driver imx7_reset_driver = {
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.probe = imx7_reset_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = imx7_reset_dt_ids,
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},
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};
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builtin_platform_driver(imx7_reset_driver);
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