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_optional_exclusive(np);
  56         if (IS_ERR(simple->resets)) {
  57                 ret = PTR_ERR(simple->resets);
  58                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
  59                 return ret;
  60         }
  61
  62         ret = reset_control_deassert(simple->resets);
  63         if (ret)
  64                 goto err_resetc_put;
  65
  66         ret = clk_bulk_get_all(simple->dev, &simple->clks);
  67         if (ret < 0)
  68                 goto err_resetc_assert;
  69
  70         simple->num_clocks = ret;
  71         ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
  72         if (ret)
  73                 goto err_resetc_assert;
  74
  75         ret = of_platform_populate(np, NULL, NULL, dev);
  76         if (ret)
  77                 goto err_clk_put;
  78
  79         pm_runtime_set_active(dev);
  80         pm_runtime_enable(dev);
  81         pm_runtime_get_sync(dev);
  82
  83         return 0;
  84
  85 err_clk_put:
  86         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
  87         clk_bulk_put_all(simple->num_clocks, simple->clks);
  88
  89 err_resetc_assert:
  90         reset_control_assert(simple->resets);
  91
  92 err_resetc_put:
  93         reset_control_put(simple->resets);
  94         return ret;
  95 }
  96
  97 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
  98 {
  99         of_platform_depopulate(simple->dev);
 100
 101         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
 102         clk_bulk_put_all(simple->num_clocks, simple->clks);
 103         simple->num_clocks = 0;
 104
 105         reset_control_assert(simple->resets);
 106
 107         reset_control_put(simple->resets);
 108
 109         pm_runtime_disable(simple->dev);
 110         pm_runtime_put_noidle(simple->dev);
 111         pm_runtime_set_suspended(simple->dev);
 112 }
 113
 114 static void dwc3_of_simple_remove(struct platform_device *pdev)
 115 {
 116         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 117
 118         __dwc3_of_simple_teardown(simple);
 119 }
 120
 121 static void dwc3_of_simple_shutdown(struct platform_device *pdev)
 122 {
 123         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 124
 125         __dwc3_of_simple_teardown(simple);
 126 }
 127
 128 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
 129 {
 130         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 131
 132         clk_bulk_disable(simple->num_clocks, simple->clks);
 133
 134         return 0;
 135 }
 136
 137 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
 138 {
 139         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 140
 141         return clk_bulk_enable(simple->num_clocks, simple->clks);
 142 }
 143
 144 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
 145 {
 146         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 147
 148         if (simple->need_reset)
 149                 reset_control_assert(simple->resets);
 150
 151         return 0;
 152 }
 153
 154 static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
 155 {
 156         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 157
 158         if (simple->need_reset)
 159                 reset_control_deassert(simple->resets);
 160
 161         return 0;
 162 }
 163
 164 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 165         SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
 166         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 167                         dwc3_of_simple_runtime_resume, NULL)
 168 };
 169
 170 static const struct of_device_id of_dwc3_simple_match[] = {
 171         { .compatible = "rockchip,rk3399-dwc3" },
 172         { .compatible = "sprd,sc9860-dwc3" },
 173         { .compatible = "allwinner,sun50i-h6-dwc3" },
 174         { .compatible = "hisilicon,hi3670-dwc3" },
 175         { .compatible = "hisilicon,hi3798mv200-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>");