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              **clks;
  28         int                     num_clocks;
  29         struct reset_control    *resets;
  30 };
  31
  32 static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
  33 {
  34         struct device           *dev = simple->dev;
  35         struct device_node      *np = dev->of_node;
  36         int                     i;
  37
  38         simple->num_clocks = count;
  39
  40         if (!count)
  41                 return 0;
  42
  43         simple->clks = devm_kcalloc(dev, simple->num_clocks,
  44                         sizeof(struct clk *), GFP_KERNEL);
  45         if (!simple->clks)
  46                 return -ENOMEM;
  47
  48         for (i = 0; i < simple->num_clocks; i++) {
  49                 struct clk      *clk;
  50                 int             ret;
  51
  52                 clk = of_clk_get(np, i);
  53                 if (IS_ERR(clk)) {
  54                         while (--i >= 0) {
  55                                 clk_disable_unprepare(simple->clks[i]);
  56                                 clk_put(simple->clks[i]);
  57                         }
  58                         return PTR_ERR(clk);
  59                 }
  60
  61                 ret = clk_prepare_enable(clk);
  62                 if (ret < 0) {
  63                         while (--i >= 0) {
  64                                 clk_disable_unprepare(simple->clks[i]);
  65                                 clk_put(simple->clks[i]);
  66                         }
  67                         clk_put(clk);
  68
  69                         return ret;
  70                 }
  71
  72                 simple->clks[i] = clk;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int dwc3_of_simple_probe(struct platform_device *pdev)
  79 {
  80         struct dwc3_of_simple   *simple;
  81         struct device           *dev = &pdev->dev;
  82         struct device_node      *np = dev->of_node;
  83
  84         int                     ret;
  85         int                     i;
  86
  87         simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  88         if (!simple)
  89                 return -ENOMEM;
  90
  91         platform_set_drvdata(pdev, simple);
  92         simple->dev = dev;
  93
  94         simple->resets = of_reset_control_array_get_optional_exclusive(np);
  95         if (IS_ERR(simple->resets)) {
  96                 ret = PTR_ERR(simple->resets);
  97                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
  98                 return ret;
  99         }
 100
 101         ret = reset_control_deassert(simple->resets);
 102         if (ret)
 103                 goto err_resetc_put;
 104
 105         ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
 106                                                 "clocks", "#clock-cells"));
 107         if (ret)
 108                 goto err_resetc_assert;
 109
 110         ret = of_platform_populate(np, NULL, NULL, dev);
 111         if (ret) {
 112                 for (i = 0; i < simple->num_clocks; i++) {
 113                         clk_disable_unprepare(simple->clks[i]);
 114                         clk_put(simple->clks[i]);
 115                 }
 116
 117                 goto err_resetc_assert;
 118         }
 119
 120         pm_runtime_set_active(dev);
 121         pm_runtime_enable(dev);
 122         pm_runtime_get_sync(dev);
 123
 124         return 0;
 125
 126 err_resetc_assert:
 127         reset_control_assert(simple->resets);
 128
 129 err_resetc_put:
 130         reset_control_put(simple->resets);
 131         return ret;
 132 }
 133
 134 static int dwc3_of_simple_remove(struct platform_device *pdev)
 135 {
 136         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 137         struct device           *dev = &pdev->dev;
 138         int                     i;
 139
 140         of_platform_depopulate(dev);
 141
 142         for (i = 0; i < simple->num_clocks; i++) {
 143                 clk_disable_unprepare(simple->clks[i]);
 144                 clk_put(simple->clks[i]);
 145         }
 146
 147         reset_control_assert(simple->resets);
 148         reset_control_put(simple->resets);
 149
 150         pm_runtime_put_sync(dev);
 151         pm_runtime_disable(dev);
 152
 153         return 0;
 154 }
 155
 156 #ifdef CONFIG_PM
 157 static int dwc3_of_simple_runtime_suspend(struct device *dev)
 158 {
 159         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 160         int                     i;
 161
 162         for (i = 0; i < simple->num_clocks; i++)
 163                 clk_disable(simple->clks[i]);
 164
 165         return 0;
 166 }
 167
 168 static int dwc3_of_simple_runtime_resume(struct device *dev)
 169 {
 170         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 171         int                     ret;
 172         int                     i;
 173
 174         for (i = 0; i < simple->num_clocks; i++) {
 175                 ret = clk_enable(simple->clks[i]);
 176                 if (ret < 0) {
 177                         while (--i >= 0)
 178                                 clk_disable(simple->clks[i]);
 179                         return ret;
 180                 }
 181         }
 182
 183         return 0;
 184 }
 185 #endif
 186
 187 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 188         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 189                         dwc3_of_simple_runtime_resume, NULL)
 190 };
 191
 192 static const struct of_device_id of_dwc3_simple_match[] = {
 193         { .compatible = "qcom,dwc3" },
 194         { .compatible = "rockchip,rk3399-dwc3" },
 195         { .compatible = "xlnx,zynqmp-dwc3" },
 196         { .compatible = "cavium,octeon-7130-usb-uctl" },
 197         { .compatible = "sprd,sc9860-dwc3" },
 198         { /* Sentinel */ }
 199 };
 200 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 201
 202 static struct platform_driver dwc3_of_simple_driver = {
 203         .probe          = dwc3_of_simple_probe,
 204         .remove         = dwc3_of_simple_remove,
 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>");