drivers/reset/reset-imx7.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2017, Impinj, Inc.
   4  *
   5  * i.MX7 System Reset Controller (SRC) driver
   6  *
   7  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   8  */
   9
  10 #include <linux/mfd/syscon.h>
  11 #include <linux/mod_devicetable.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/reset-controller.h>
  15 #include <linux/regmap.h>
  16 #include <dt-bindings/reset/imx7-reset.h>
  17 #include <dt-bindings/reset/imx8mq-reset.h>
  18
  19 struct imx7_src_signal {
  20         unsigned int offset, bit;
  21 };
  22
  23 struct imx7_src_variant {
  24         const struct imx7_src_signal *signals;
  25         unsigned int signals_num;
  26         struct reset_control_ops ops;
  27 };
  28
  29 struct imx7_src {
  30         struct reset_controller_dev rcdev;
  31         struct regmap *regmap;
  32         const struct imx7_src_signal *signals;
  33 };
  34
  35 enum imx7_src_registers {
  36         SRC_A7RCR0              = 0x0004,
  37         SRC_M4RCR               = 0x000c,
  38         SRC_ERCR                = 0x0014,
  39         SRC_HSICPHY_RCR         = 0x001c,
  40         SRC_USBOPHY1_RCR        = 0x0020,
  41         SRC_USBOPHY2_RCR        = 0x0024,
  42         SRC_MIPIPHY_RCR         = 0x0028,
  43         SRC_PCIEPHY_RCR         = 0x002c,
  44         SRC_DDRC_RCR            = 0x1000,
  45 };
  46
  47 static int imx7_reset_update(struct imx7_src *imx7src,
  48                              unsigned long id, unsigned int value)
  49 {
  50         const struct imx7_src_signal *signal = &imx7src->signals[id];
  51
  52         return regmap_update_bits(imx7src->regmap,
  53                                   signal->offset, signal->bit, value);
  54 }
  55
  56 static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
  57         [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
  58         [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
  59         [IMX7_RESET_A7_CORE_RESET0]     = { SRC_A7RCR0, BIT(4) },
  60         [IMX7_RESET_A7_CORE_RESET1]     = { SRC_A7RCR0, BIT(5) },
  61         [IMX7_RESET_A7_DBG_RESET0]      = { SRC_A7RCR0, BIT(8) },
  62         [IMX7_RESET_A7_DBG_RESET1]      = { SRC_A7RCR0, BIT(9) },
  63         [IMX7_RESET_A7_ETM_RESET0]      = { SRC_A7RCR0, BIT(12) },
  64         [IMX7_RESET_A7_ETM_RESET1]      = { SRC_A7RCR0, BIT(13) },
  65         [IMX7_RESET_A7_SOC_DBG_RESET]   = { SRC_A7RCR0, BIT(20) },
  66         [IMX7_RESET_A7_L2RESET]         = { SRC_A7RCR0, BIT(21) },
  67         [IMX7_RESET_SW_M4C_RST]         = { SRC_M4RCR, BIT(1) },
  68         [IMX7_RESET_SW_M4P_RST]         = { SRC_M4RCR, BIT(2) },
  69         [IMX7_RESET_EIM_RST]            = { SRC_ERCR, BIT(0) },
  70         [IMX7_RESET_HSICPHY_PORT_RST]   = { SRC_HSICPHY_RCR, BIT(1) },
  71         [IMX7_RESET_USBPHY1_POR]        = { SRC_USBOPHY1_RCR, BIT(0) },
  72         [IMX7_RESET_USBPHY1_PORT_RST]   = { SRC_USBOPHY1_RCR, BIT(1) },
  73         [IMX7_RESET_USBPHY2_POR]        = { SRC_USBOPHY2_RCR, BIT(0) },
  74         [IMX7_RESET_USBPHY2_PORT_RST]   = { SRC_USBOPHY2_RCR, BIT(1) },
  75         [IMX7_RESET_MIPI_PHY_MRST]      = { SRC_MIPIPHY_RCR, BIT(1) },
  76         [IMX7_RESET_MIPI_PHY_SRST]      = { SRC_MIPIPHY_RCR, BIT(2) },
  77         [IMX7_RESET_PCIEPHY]            = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
  78         [IMX7_RESET_PCIEPHY_PERST]      = { SRC_PCIEPHY_RCR, BIT(3) },
  79         [IMX7_RESET_PCIE_CTRL_APPS_EN]  = { SRC_PCIEPHY_RCR, BIT(6) },
  80         [IMX7_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
  81         [IMX7_RESET_DDRC_PRST]          = { SRC_DDRC_RCR, BIT(0) },
  82         [IMX7_RESET_DDRC_CORE_RST]      = { SRC_DDRC_RCR, BIT(1) },
  83 };
  84
  85 static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
  86 {
  87         return container_of(rcdev, struct imx7_src, rcdev);
  88 }
  89
  90 static int imx7_reset_set(struct reset_controller_dev *rcdev,
  91                           unsigned long id, bool assert)
  92 {
  93         struct imx7_src *imx7src = to_imx7_src(rcdev);
  94         const unsigned int bit = imx7src->signals[id].bit;
  95         unsigned int value = assert ? bit : 0;
  96
  97         switch (id) {
  98         case IMX7_RESET_PCIEPHY:
  99                 /*
 100                  * wait for more than 10us to release phy g_rst and
 101                  * btnrst
 102                  */
 103                 if (!assert)
 104                         udelay(10);
 105                 break;
 106
 107         case IMX7_RESET_PCIE_CTRL_APPS_EN:
 108                 value = assert ? 0 : bit;
 109                 break;
 110         }
 111
 112         return imx7_reset_update(imx7src, id, value);
 113 }
 114
 115 static int imx7_reset_assert(struct reset_controller_dev *rcdev,
 116                              unsigned long id)
 117 {
 118         return imx7_reset_set(rcdev, id, true);
 119 }
 120
 121 static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
 122                                unsigned long id)
 123 {
 124         return imx7_reset_set(rcdev, id, false);
 125 }
 126
 127 static const struct imx7_src_variant variant_imx7 = {
 128         .signals = imx7_src_signals,
 129         .signals_num = ARRAY_SIZE(imx7_src_signals),
 130         .ops = {
 131                 .assert   = imx7_reset_assert,
 132                 .deassert = imx7_reset_deassert,
 133         },
 134 };
 135
 136 enum imx8mq_src_registers {
 137         SRC_A53RCR0             = 0x0004,
 138         SRC_HDMI_RCR            = 0x0030,
 139         SRC_DISP_RCR            = 0x0034,
 140         SRC_GPU_RCR             = 0x0040,
 141         SRC_VPU_RCR             = 0x0044,
 142         SRC_PCIE2_RCR           = 0x0048,
 143         SRC_MIPIPHY1_RCR        = 0x004c,
 144         SRC_MIPIPHY2_RCR        = 0x0050,
 145         SRC_DDRC2_RCR           = 0x1004,
 146 };
 147
 148 static const struct imx7_src_signal imx8mq_src_signals[IMX8MQ_RESET_NUM] = {
 149         [IMX8MQ_RESET_A53_CORE_POR_RESET0]      = { SRC_A53RCR0, BIT(0) },
 150         [IMX8MQ_RESET_A53_CORE_POR_RESET1]      = { SRC_A53RCR0, BIT(1) },
 151         [IMX8MQ_RESET_A53_CORE_POR_RESET2]      = { SRC_A53RCR0, BIT(2) },
 152         [IMX8MQ_RESET_A53_CORE_POR_RESET3]      = { SRC_A53RCR0, BIT(3) },
 153         [IMX8MQ_RESET_A53_CORE_RESET0]          = { SRC_A53RCR0, BIT(4) },
 154         [IMX8MQ_RESET_A53_CORE_RESET1]          = { SRC_A53RCR0, BIT(5) },
 155         [IMX8MQ_RESET_A53_CORE_RESET2]          = { SRC_A53RCR0, BIT(6) },
 156         [IMX8MQ_RESET_A53_CORE_RESET3]          = { SRC_A53RCR0, BIT(7) },
 157         [IMX8MQ_RESET_A53_DBG_RESET0]           = { SRC_A53RCR0, BIT(8) },
 158         [IMX8MQ_RESET_A53_DBG_RESET1]           = { SRC_A53RCR0, BIT(9) },
 159         [IMX8MQ_RESET_A53_DBG_RESET2]           = { SRC_A53RCR0, BIT(10) },
 160         [IMX8MQ_RESET_A53_DBG_RESET3]           = { SRC_A53RCR0, BIT(11) },
 161         [IMX8MQ_RESET_A53_ETM_RESET0]           = { SRC_A53RCR0, BIT(12) },
 162         [IMX8MQ_RESET_A53_ETM_RESET1]           = { SRC_A53RCR0, BIT(13) },
 163         [IMX8MQ_RESET_A53_ETM_RESET2]           = { SRC_A53RCR0, BIT(14) },
 164         [IMX8MQ_RESET_A53_ETM_RESET3]           = { SRC_A53RCR0, BIT(15) },
 165         [IMX8MQ_RESET_A53_SOC_DBG_RESET]        = { SRC_A53RCR0, BIT(20) },
 166         [IMX8MQ_RESET_A53_L2RESET]              = { SRC_A53RCR0, BIT(21) },
 167         [IMX8MQ_RESET_SW_NON_SCLR_M4C_RST]      = { SRC_M4RCR, BIT(0) },
 168         [IMX8MQ_RESET_OTG1_PHY_RESET]           = { SRC_USBOPHY1_RCR, BIT(0) },
 169         [IMX8MQ_RESET_OTG2_PHY_RESET]           = { SRC_USBOPHY2_RCR, BIT(0) },
 170         [IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N]    = { SRC_MIPIPHY_RCR, BIT(1) },
 171         [IMX8MQ_RESET_MIPI_DSI_RESET_N]         = { SRC_MIPIPHY_RCR, BIT(2) },
 172         [IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N]     = { SRC_MIPIPHY_RCR, BIT(3) },
 173         [IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N]     = { SRC_MIPIPHY_RCR, BIT(4) },
 174         [IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N]    = { SRC_MIPIPHY_RCR, BIT(5) },
 175         [IMX8MQ_RESET_PCIEPHY]                  = { SRC_PCIEPHY_RCR,
 176                                                     BIT(2) | BIT(1) },
 177         [IMX8MQ_RESET_PCIEPHY_PERST]            = { SRC_PCIEPHY_RCR, BIT(3) },
 178         [IMX8MQ_RESET_PCIE_CTRL_APPS_EN]        = { SRC_PCIEPHY_RCR, BIT(6) },
 179         [IMX8MQ_RESET_PCIE_CTRL_APPS_TURNOFF]   = { SRC_PCIEPHY_RCR, BIT(11) },
 180         [IMX8MQ_RESET_HDMI_PHY_APB_RESET]       = { SRC_HDMI_RCR, BIT(0) },
 181         [IMX8MQ_RESET_DISP_RESET]               = { SRC_DISP_RCR, BIT(0) },
 182         [IMX8MQ_RESET_GPU_RESET]                = { SRC_GPU_RCR, BIT(0) },
 183         [IMX8MQ_RESET_VPU_RESET]                = { SRC_VPU_RCR, BIT(0) },
 184         [IMX8MQ_RESET_PCIEPHY2]                 = { SRC_PCIE2_RCR,
 185                                                     BIT(2) | BIT(1) },
 186         [IMX8MQ_RESET_PCIEPHY2_PERST]           = { SRC_PCIE2_RCR, BIT(3) },
 187         [IMX8MQ_RESET_PCIE2_CTRL_APPS_EN]       = { SRC_PCIE2_RCR, BIT(6) },
 188         [IMX8MQ_RESET_PCIE2_CTRL_APPS_TURNOFF]  = { SRC_PCIE2_RCR, BIT(11) },
 189         [IMX8MQ_RESET_MIPI_CSI1_CORE_RESET]     = { SRC_MIPIPHY1_RCR, BIT(0) },
 190         [IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET]  = { SRC_MIPIPHY1_RCR, BIT(1) },
 191         [IMX8MQ_RESET_MIPI_CSI1_ESC_RESET]      = { SRC_MIPIPHY1_RCR, BIT(2) },
 192         [IMX8MQ_RESET_MIPI_CSI2_CORE_RESET]     = { SRC_MIPIPHY2_RCR, BIT(0) },
 193         [IMX8MQ_RESET_MIPI_CSI2_PHY_REF_RESET]  = { SRC_MIPIPHY2_RCR, BIT(1) },
 194         [IMX8MQ_RESET_MIPI_CSI2_ESC_RESET]      = { SRC_MIPIPHY2_RCR, BIT(2) },
 195         [IMX8MQ_RESET_DDRC1_PRST]               = { SRC_DDRC_RCR, BIT(0) },
 196         [IMX8MQ_RESET_DDRC1_CORE_RESET]         = { SRC_DDRC_RCR, BIT(1) },
 197         [IMX8MQ_RESET_DDRC1_PHY_RESET]          = { SRC_DDRC_RCR, BIT(2) },
 198         [IMX8MQ_RESET_DDRC2_PHY_RESET]          = { SRC_DDRC2_RCR, BIT(0) },
 199         [IMX8MQ_RESET_DDRC2_CORE_RESET]         = { SRC_DDRC2_RCR, BIT(1) },
 200         [IMX8MQ_RESET_DDRC2_PRST]               = { SRC_DDRC2_RCR, BIT(2) },
 201 };
 202
 203 static int imx8mq_reset_set(struct reset_controller_dev *rcdev,
 204                             unsigned long id, bool assert)
 205 {
 206         struct imx7_src *imx7src = to_imx7_src(rcdev);
 207         const unsigned int bit = imx7src->signals[id].bit;
 208         unsigned int value = assert ? bit : 0;
 209
 210         switch (id) {
 211         case IMX8MQ_RESET_PCIEPHY:
 212         case IMX8MQ_RESET_PCIEPHY2: /* fallthrough */
 213                 /*
 214                  * wait for more than 10us to release phy g_rst and
 215                  * btnrst
 216                  */
 217                 if (!assert)
 218                         udelay(10);
 219                 break;
 220
 221         case IMX8MQ_RESET_PCIE_CTRL_APPS_EN:
 222         case IMX8MQ_RESET_PCIE2_CTRL_APPS_EN:   /* fallthrough */
 223         case IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N:        /* fallthrough */
 224         case IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N: /* fallthrough */
 225         case IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N: /* fallthrough */
 226         case IMX8MQ_RESET_MIPI_DSI_RESET_N:     /* fallthrough */
 227         case IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N:        /* fallthrough */
 228                 value = assert ? 0 : bit;
 229                 break;
 230         }
 231
 232         return imx7_reset_update(imx7src, id, value);
 233 }
 234
 235 static int imx8mq_reset_assert(struct reset_controller_dev *rcdev,
 236                                unsigned long id)
 237 {
 238         return imx8mq_reset_set(rcdev, id, true);
 239 }
 240
 241 static int imx8mq_reset_deassert(struct reset_controller_dev *rcdev,
 242                                  unsigned long id)
 243 {
 244         return imx8mq_reset_set(rcdev, id, false);
 245 }
 246
 247 static const struct imx7_src_variant variant_imx8mq = {
 248         .signals = imx8mq_src_signals,
 249         .signals_num = ARRAY_SIZE(imx8mq_src_signals),
 250         .ops = {
 251                 .assert   = imx8mq_reset_assert,
 252                 .deassert = imx8mq_reset_deassert,
 253         },
 254 };
 255
 256 static int imx7_reset_probe(struct platform_device *pdev)
 257 {
 258         struct imx7_src *imx7src;
 259         struct device *dev = &pdev->dev;
 260         struct regmap_config config = { .name = "src" };
 261         const struct imx7_src_variant *variant = of_device_get_match_data(dev);
 262
 263         imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
 264         if (!imx7src)
 265                 return -ENOMEM;
 266
 267         imx7src->signals = variant->signals;
 268         imx7src->regmap = syscon_node_to_regmap(dev->of_node);
 269         if (IS_ERR(imx7src->regmap)) {
 270                 dev_err(dev, "Unable to get imx7-src regmap");
 271                 return PTR_ERR(imx7src->regmap);
 272         }
 273         regmap_attach_dev(dev, imx7src->regmap, &config);
 274
 275         imx7src->rcdev.owner     = THIS_MODULE;
 276         imx7src->rcdev.nr_resets = variant->signals_num;
 277         imx7src->rcdev.ops       = &variant->ops;
 278         imx7src->rcdev.of_node   = dev->of_node;
 279
 280         return devm_reset_controller_register(dev, &imx7src->rcdev);
 281 }
 282
 283 static const struct of_device_id imx7_reset_dt_ids[] = {
 284         { .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
 285         { .compatible = "fsl,imx8mq-src", .data = &variant_imx8mq },
 286         { /* sentinel */ },
 287 };
 288
 289 static struct platform_driver imx7_reset_driver = {
 290         .probe  = imx7_reset_probe,
 291         .driver = {
 292                 .name           = KBUILD_MODNAME,
 293                 .of_match_table = imx7_reset_dt_ids,
 294         },
 295 };
 296 builtin_platform_driver(imx7_reset_driver);