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 - http://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                    pulse_resets;
  31         bool                    need_reset;
  32 };
  33
  34 static int dwc3_of_simple_probe(struct platform_device *pdev)
  35 {
  36         struct dwc3_of_simple   *simple;
  37         struct device           *dev = &pdev->dev;
  38         struct device_node      *np = dev->of_node;
  39
  40         int                     ret;
  41         bool                    shared_resets = false;
  42
  43         simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  44         if (!simple)
  45                 return -ENOMEM;
  46
  47         platform_set_drvdata(pdev, simple);
  48         simple->dev = dev;
  49
  50         /*
  51          * Some controllers need to toggle the usb3-otg reset before trying to
  52          * initialize the PHY, otherwise the PHY times out.
  53          */
  54         if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
  55                 simple->need_reset = true;
  56
  57         if (of_device_is_compatible(np, "amlogic,meson-axg-dwc3") ||
  58             of_device_is_compatible(np, "amlogic,meson-gxl-dwc3")) {
  59                 shared_resets = true;
  60                 simple->pulse_resets = true;
  61         }
  62
  63         simple->resets = of_reset_control_array_get(np, shared_resets, true,
  64                                                     true);
  65         if (IS_ERR(simple->resets)) {
  66                 ret = PTR_ERR(simple->resets);
  67                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
  68                 return ret;
  69         }
  70
  71         if (simple->pulse_resets) {
  72                 ret = reset_control_reset(simple->resets);
  73                 if (ret)
  74                         goto err_resetc_put;
  75         } else {
  76                 ret = reset_control_deassert(simple->resets);
  77                 if (ret)
  78                         goto err_resetc_put;
  79         }
  80
  81         ret = clk_bulk_get_all(simple->dev, &simple->clks);
  82         if (ret < 0)
  83                 goto err_resetc_assert;
  84
  85         simple->num_clocks = ret;
  86         ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
  87         if (ret)
  88                 goto err_resetc_assert;
  89
  90         ret = of_platform_populate(np, NULL, NULL, dev);
  91         if (ret)
  92                 goto err_clk_put;
  93
  94         pm_runtime_set_active(dev);
  95         pm_runtime_enable(dev);
  96         pm_runtime_get_sync(dev);
  97
  98         return 0;
  99
 100 err_clk_put:
 101         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
 102         clk_bulk_put_all(simple->num_clocks, simple->clks);
 103
 104 err_resetc_assert:
 105         if (!simple->pulse_resets)
 106                 reset_control_assert(simple->resets);
 107
 108 err_resetc_put:
 109         reset_control_put(simple->resets);
 110         return ret;
 111 }
 112
 113 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
 114 {
 115         of_platform_depopulate(simple->dev);
 116
 117         clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
 118         clk_bulk_put_all(simple->num_clocks, simple->clks);
 119         simple->num_clocks = 0;
 120
 121         if (!simple->pulse_resets)
 122                 reset_control_assert(simple->resets);
 123
 124         reset_control_put(simple->resets);
 125
 126         pm_runtime_disable(simple->dev);
 127         pm_runtime_put_noidle(simple->dev);
 128         pm_runtime_set_suspended(simple->dev);
 129 }
 130
 131 static int dwc3_of_simple_remove(struct platform_device *pdev)
 132 {
 133         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 134
 135         __dwc3_of_simple_teardown(simple);
 136
 137         return 0;
 138 }
 139
 140 static void dwc3_of_simple_shutdown(struct platform_device *pdev)
 141 {
 142         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 143
 144         __dwc3_of_simple_teardown(simple);
 145 }
 146
 147 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
 148 {
 149         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 150
 151         clk_bulk_disable(simple->num_clocks, simple->clks);
 152
 153         return 0;
 154 }
 155
 156 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
 157 {
 158         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 159
 160         return clk_bulk_enable(simple->num_clocks, simple->clks);
 161 }
 162
 163 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
 164 {
 165         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 166
 167         if (simple->need_reset)
 168                 reset_control_assert(simple->resets);
 169
 170         return 0;
 171 }
 172
 173 static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
 174 {
 175         struct dwc3_of_simple *simple = dev_get_drvdata(dev);
 176
 177         if (simple->need_reset)
 178                 reset_control_deassert(simple->resets);
 179
 180         return 0;
 181 }
 182
 183 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 184         SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
 185         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 186                         dwc3_of_simple_runtime_resume, NULL)
 187 };
 188
 189 static const struct of_device_id of_dwc3_simple_match[] = {
 190         { .compatible = "rockchip,rk3399-dwc3" },
 191         { .compatible = "xlnx,zynqmp-dwc3" },
 192         { .compatible = "cavium,octeon-7130-usb-uctl" },
 193         { .compatible = "sprd,sc9860-dwc3" },
 194         { .compatible = "amlogic,meson-axg-dwc3" },
 195         { .compatible = "amlogic,meson-gxl-dwc3" },
 196         { .compatible = "allwinner,sun50i-h6-dwc3" },
 197         { /* Sentinel */ }
 198 };
 199 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 200
 201 static struct platform_driver dwc3_of_simple_driver = {
 202         .probe          = dwc3_of_simple_probe,
 203         .remove         = dwc3_of_simple_remove,
 204         .shutdown       = dwc3_of_simple_shutdown,
 205         .driver         = {
 206                 .name   = "dwc3-of-simple",
 207                 .of_match_table = of_dwc3_simple_match,
 208                 .pm     = &dwc3_of_simple_dev_pm_ops,
 209         },
 210 };
 211
 212 module_platform_driver(dwc3_of_simple_driver);
 213 MODULE_LICENSE("GPL v2");
 214 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
 215 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");