drivers/usb/dwc3/dwc3-of-simple.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dwc3-of-simple.c - OF glue layer for simple integrations
   4  *
   5  * Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com
   6  *
   7  * Author: Felipe Balbi <balbi@ti.com>
   8  *
   9  * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
  10  * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
  11  * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/clk.h>
  20 #include <linux/of.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/reset.h>
  24
  25 struct dwc3_of_simple {
  26         struct device           *dev;
  27         struct clk_bulk_data    *clks;
  28         int                     num_clocks;
  29         struct reset_control    *resets;
  30         bool                    need_reset;
  31 };
  32
  33 static int dwc3_of_simple_probe(struct platform_device *pdev)
  34 {
  35         struct dwc3_of_simple   *simple;
  36         struct device           *dev = &pdev->dev;
  37         struct device_node      *np = dev->of_node;
  38
  39         int                     ret;
  40
  41         simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  42         if (!simple)
  43                 return -ENOMEM;
  44
  45         platform_set_drvdata(pdev, simple);
  46         simple->dev = dev;
  47
  48         /*
  49          * Some controllers need to toggle the usb3-otg reset before trying to
  50          * initialize the PHY, otherwise the PHY times out.
  51          */
  52         if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
  53                 simple->need_reset = true;
  54
  55         simple->resets = of_reset_control_array_get(np, false, true,
  56                                                     true);
  57         if (IS_ERR(simple->resets)) {
  58                 ret = PTR_ERR(simple->resets);
  59                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
  60                 return ret;
  61         }
  62
  63         ret = reset_control_deassert(simple->resets);
  64         if (ret)
  65                 goto err_resetc_put;
  66
  67         ret = clk_bulk_get_all(simple->dev, &simple->clks);
  68         if (ret < 0)
  69                 goto err_resetc_assert;
  70
  71         simple->num_clocks = ret;
  72         ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
  73         if (ret)
  74                 goto err_resetc_assert;
  75
  76         ret = of_platform_populate(np, NULL, NULL, dev);
  77         if (ret)
  78                 goto err_clk_put;
  79
  80         pm_runtime_set_active(dev);
  81         pm_runtime_enable(dev);
  82         pm_runtime_get_sync(dev);
  83
  84         return 0;
  85
  86 err_clk_put:
  87         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
  88         clk_bulk_put_all(simple->num_clocks, simple->clks);
  89
  90 err_resetc_assert:
  91         reset_control_assert(simple->resets);
  92
  93 err_resetc_put:
  94         reset_control_put(simple->resets);
  95         return ret;
  96 }
  97
  98 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
  99 {
 100         of_platform_depopulate(simple->dev);
 101
 102         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
 103         clk_bulk_put_all(simple->num_clocks, simple->clks);
 104         simple->num_clocks = 0;
 105
 106         reset_control_assert(simple->resets);
 107
 108         reset_control_put(simple->resets);
 109
 110         pm_runtime_disable(simple->dev);
 111         pm_runtime_put_noidle(simple->dev);
 112         pm_runtime_set_suspended(simple->dev);
 113 }
 114
 115 static void dwc3_of_simple_remove(struct platform_device *pdev)
 116 {
 117         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 118
 119         __dwc3_of_simple_teardown(simple);
 120 }
 121
 122 static void dwc3_of_simple_shutdown(struct platform_device *pdev)
 123 {
 124         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 125
 126         __dwc3_of_simple_teardown(simple);
 127 }
 128
 129 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
 130 {
 131         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 132
 133         clk_bulk_disable(simple->num_clocks, simple->clks);
 134
 135         return 0;
 136 }
 137
 138 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
 139 {
 140         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 141
 142         return clk_bulk_enable(simple->num_clocks, simple->clks);
 143 }
 144
 145 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
 146 {
 147         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 148
 149         if (simple->need_reset)
 150                 reset_control_assert(simple->resets);
 151
 152         return 0;
 153 }
 154
 155 static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
 156 {
 157         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 158
 159         if (simple->need_reset)
 160                 reset_control_deassert(simple->resets);
 161
 162         return 0;
 163 }
 164
 165 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 166         SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
 167         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 168                         dwc3_of_simple_runtime_resume, NULL)
 169 };
 170
 171 static const struct of_device_id of_dwc3_simple_match[] = {
 172         { .compatible = "rockchip,rk3399-dwc3" },
 173         { .compatible = "sprd,sc9860-dwc3" },
 174         { .compatible = "allwinner,sun50i-h6-dwc3" },
 175         { .compatible = "hisilicon,hi3670-dwc3" },
 176         { .compatible = "intel,keembay-dwc3" },
 177         { /* Sentinel */ }
 178 };
 179 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 180
 181 static struct platform_driver dwc3_of_simple_driver = {
 182         .probe          = dwc3_of_simple_probe,
 183         .remove_new     = dwc3_of_simple_remove,
 184         .shutdown       = dwc3_of_simple_shutdown,
 185         .driver         = {
 186                 .name   = "dwc3-of-simple",
 187                 .of_match_table = of_dwc3_simple_match,
 188                 .pm     = &dwc3_of_simple_dev_pm_ops,
 189         },
 190 };
 191
 192 module_platform_driver(dwc3_of_simple_driver);
 193 MODULE_LICENSE("GPL v2");
 194 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
 195 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");