drivers/usb/dwc3/dwc3-exynos.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dwc3-exynos.c - Samsung Exynos DWC3 Specific Glue layer
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *              http://www.samsung.com
   7  *
   8  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/of.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/regulator/consumer.h>
  19
  20 #define DWC3_EXYNOS_MAX_CLOCKS  4
  21
  22 struct dwc3_exynos_driverdata {
  23         const char              *clk_names[DWC3_EXYNOS_MAX_CLOCKS];
  24         int                     num_clks;
  25         int                     suspend_clk_idx;
  26 };
  27
  28 struct dwc3_exynos {
  29         struct device           *dev;
  30
  31         const char              **clk_names;
  32         struct clk              *clks[DWC3_EXYNOS_MAX_CLOCKS];
  33         int                     num_clks;
  34         int                     suspend_clk_idx;
  35
  36         struct regulator        *vdd33;
  37         struct regulator        *vdd10;
  38 };
  39
  40 static int dwc3_exynos_probe(struct platform_device *pdev)
  41 {
  42         struct dwc3_exynos      *exynos;
  43         struct device           *dev = &pdev->dev;
  44         struct device_node      *node = dev->of_node;
  45         const struct dwc3_exynos_driverdata *driver_data;
  46         int                     i, ret;
  47
  48         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
  49         if (!exynos)
  50                 return -ENOMEM;
  51
  52         driver_data = of_device_get_match_data(dev);
  53         exynos->dev = dev;
  54         exynos->num_clks = driver_data->num_clks;
  55         exynos->clk_names = (const char **)driver_data->clk_names;
  56         exynos->suspend_clk_idx = driver_data->suspend_clk_idx;
  57
  58         platform_set_drvdata(pdev, exynos);
  59
  60         for (i = 0; i < exynos->num_clks; i++) {
  61                 exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
  62                 if (IS_ERR(exynos->clks[i])) {
  63                         dev_err(dev, "failed to get clock: %s\n",
  64                                 exynos->clk_names[i]);
  65                         return PTR_ERR(exynos->clks[i]);
  66                 }
  67         }
  68
  69         for (i = 0; i < exynos->num_clks; i++) {
  70                 ret = clk_prepare_enable(exynos->clks[i]);
  71                 if (ret) {
  72                         while (i-- > 0)
  73                                 clk_disable_unprepare(exynos->clks[i]);
  74                         return ret;
  75                 }
  76         }
  77
  78         if (exynos->suspend_clk_idx >= 0)
  79                 clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
  80
  81         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
  82         if (IS_ERR(exynos->vdd33)) {
  83                 ret = PTR_ERR(exynos->vdd33);
  84                 goto vdd33_err;
  85         }
  86         ret = regulator_enable(exynos->vdd33);
  87         if (ret) {
  88                 dev_err(dev, "Failed to enable VDD33 supply\n");
  89                 goto vdd33_err;
  90         }
  91
  92         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
  93         if (IS_ERR(exynos->vdd10)) {
  94                 ret = PTR_ERR(exynos->vdd10);
  95                 goto vdd10_err;
  96         }
  97         ret = regulator_enable(exynos->vdd10);
  98         if (ret) {
  99                 dev_err(dev, "Failed to enable VDD10 supply\n");
 100                 goto vdd10_err;
 101         }
 102
 103         if (node) {
 104                 ret = of_platform_populate(node, NULL, NULL, dev);
 105                 if (ret) {
 106                         dev_err(dev, "failed to add dwc3 core\n");
 107                         goto populate_err;
 108                 }
 109         } else {
 110                 dev_err(dev, "no device node, failed to add dwc3 core\n");
 111                 ret = -ENODEV;
 112                 goto populate_err;
 113         }
 114
 115         return 0;
 116
 117 populate_err:
 118         regulator_disable(exynos->vdd10);
 119 vdd10_err:
 120         regulator_disable(exynos->vdd33);
 121 vdd33_err:
 122         for (i = exynos->num_clks - 1; i >= 0; i--)
 123                 clk_disable_unprepare(exynos->clks[i]);
 124
 125         if (exynos->suspend_clk_idx >= 0)
 126                 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
 127
 128         return ret;
 129 }
 130
 131 static int dwc3_exynos_remove(struct platform_device *pdev)
 132 {
 133         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
 134         int i;
 135
 136         of_platform_depopulate(&pdev->dev);
 137
 138         for (i = exynos->num_clks - 1; i >= 0; i--)
 139                 clk_disable_unprepare(exynos->clks[i]);
 140
 141         if (exynos->suspend_clk_idx >= 0)
 142                 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
 143
 144         regulator_disable(exynos->vdd33);
 145         regulator_disable(exynos->vdd10);
 146
 147         return 0;
 148 }
 149
 150 static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
 151         .clk_names = { "usbdrd30" },
 152         .num_clks = 1,
 153         .suspend_clk_idx = -1,
 154 };
 155
 156 static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
 157         .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
 158         .num_clks = 4,
 159         .suspend_clk_idx = 1,
 160 };
 161
 162 static const struct dwc3_exynos_driverdata exynos7_drvdata = {
 163         .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
 164         .num_clks = 3,
 165         .suspend_clk_idx = 1,
 166 };
 167
 168 static const struct of_device_id exynos_dwc3_match[] = {
 169         {
 170                 .compatible = "samsung,exynos5250-dwusb3",
 171                 .data = &exynos5250_drvdata,
 172         }, {
 173                 .compatible = "samsung,exynos5433-dwusb3",
 174                 .data = &exynos5433_drvdata,
 175         }, {
 176                 .compatible = "samsung,exynos7-dwusb3",
 177                 .data = &exynos7_drvdata,
 178         }, {
 179         }
 180 };
 181 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 182
 183 #ifdef CONFIG_PM_SLEEP
 184 static int dwc3_exynos_suspend(struct device *dev)
 185 {
 186         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 187         int i;
 188
 189         for (i = exynos->num_clks - 1; i >= 0; i--)
 190                 clk_disable_unprepare(exynos->clks[i]);
 191
 192         regulator_disable(exynos->vdd33);
 193         regulator_disable(exynos->vdd10);
 194
 195         return 0;
 196 }
 197
 198 static int dwc3_exynos_resume(struct device *dev)
 199 {
 200         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 201         int i, ret;
 202
 203         ret = regulator_enable(exynos->vdd33);
 204         if (ret) {
 205                 dev_err(dev, "Failed to enable VDD33 supply\n");
 206                 return ret;
 207         }
 208         ret = regulator_enable(exynos->vdd10);
 209         if (ret) {
 210                 dev_err(dev, "Failed to enable VDD10 supply\n");
 211                 return ret;
 212         }
 213
 214         for (i = 0; i < exynos->num_clks; i++) {
 215                 ret = clk_prepare_enable(exynos->clks[i]);
 216                 if (ret) {
 217                         while (i-- > 0)
 218                                 clk_disable_unprepare(exynos->clks[i]);
 219                         return ret;
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225
 226 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 227         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 228 };
 229
 230 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
 231 #else
 232 #define DEV_PM_OPS      NULL
 233 #endif /* CONFIG_PM_SLEEP */
 234
 235 static struct platform_driver dwc3_exynos_driver = {
 236         .probe          = dwc3_exynos_probe,
 237         .remove         = dwc3_exynos_remove,
 238         .driver         = {
 239                 .name   = "exynos-dwc3",
 240                 .of_match_table = exynos_dwc3_match,
 241                 .pm     = DEV_PM_OPS,
 242         },
 243 };
 244
 245 module_platform_driver(dwc3_exynos_driver);
 246
 247 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 248 MODULE_LICENSE("GPL v2");
 249 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");