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 <[email protected]>
   8  *
   9  * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
  10  * <[email protected]> and the original patch adding support for Xilinx' SoC
  11  * by Subbaraya Sundeep Bhatta <[email protected]>
  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_put(simple->clks[i]);
  56                         return PTR_ERR(clk);
  57                 }
  58
  59                 ret = clk_prepare_enable(clk);
  60                 if (ret < 0) {
  61                         while (--i >= 0) {
  62                                 clk_disable_unprepare(simple->clks[i]);
  63                                 clk_put(simple->clks[i]);
  64                         }
  65                         clk_put(clk);
  66
  67                         return ret;
  68                 }
  69
  70                 simple->clks[i] = clk;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int dwc3_of_simple_probe(struct platform_device *pdev)
  77 {
  78         struct dwc3_of_simple   *simple;
  79         struct device           *dev = &pdev->dev;
  80         struct device_node      *np = dev->of_node;
  81
  82         int                     ret;
  83         int                     i;
  84
  85         simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  86         if (!simple)
  87                 return -ENOMEM;
  88
  89         platform_set_drvdata(pdev, simple);
  90         simple->dev = dev;
  91
  92         simple->resets = of_reset_control_array_get_optional_exclusive(np);
  93         if (IS_ERR(simple->resets)) {
  94                 ret = PTR_ERR(simple->resets);
  95                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
  96                 return ret;
  97         }
  98
  99         ret = reset_control_deassert(simple->resets);
 100         if (ret)
 101                 goto err_resetc_put;
 102
 103         ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
 104                                                 "clocks", "#clock-cells"));
 105         if (ret)
 106                 goto err_resetc_assert;
 107
 108         ret = of_platform_populate(np, NULL, NULL, dev);
 109         if (ret) {
 110                 for (i = 0; i < simple->num_clocks; i++) {
 111                         clk_disable_unprepare(simple->clks[i]);
 112                         clk_put(simple->clks[i]);
 113                 }
 114
 115                 goto err_resetc_assert;
 116         }
 117
 118         pm_runtime_set_active(dev);
 119         pm_runtime_enable(dev);
 120         pm_runtime_get_sync(dev);
 121
 122         return 0;
 123
 124 err_resetc_assert:
 125         reset_control_assert(simple->resets);
 126
 127 err_resetc_put:
 128         reset_control_put(simple->resets);
 129         return ret;
 130 }
 131
 132 static int dwc3_of_simple_remove(struct platform_device *pdev)
 133 {
 134         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 135         struct device           *dev = &pdev->dev;
 136         int                     i;
 137
 138         of_platform_depopulate(dev);
 139
 140         for (i = 0; i < simple->num_clocks; i++) {
 141                 clk_disable_unprepare(simple->clks[i]);
 142                 clk_put(simple->clks[i]);
 143         }
 144
 145         reset_control_assert(simple->resets);
 146         reset_control_put(simple->resets);
 147
 148         pm_runtime_put_sync(dev);
 149         pm_runtime_disable(dev);
 150
 151         return 0;
 152 }
 153
 154 #ifdef CONFIG_PM
 155 static int dwc3_of_simple_runtime_suspend(struct device *dev)
 156 {
 157         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 158         int                     i;
 159
 160         for (i = 0; i < simple->num_clocks; i++)
 161                 clk_disable(simple->clks[i]);
 162
 163         return 0;
 164 }
 165
 166 static int dwc3_of_simple_runtime_resume(struct device *dev)
 167 {
 168         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 169         int                     ret;
 170         int                     i;
 171
 172         for (i = 0; i < simple->num_clocks; i++) {
 173                 ret = clk_enable(simple->clks[i]);
 174                 if (ret < 0) {
 175                         while (--i >= 0)
 176                                 clk_disable(simple->clks[i]);
 177                         return ret;
 178                 }
 179         }
 180
 181         return 0;
 182 }
 183 #endif
 184
 185 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 186         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 187                         dwc3_of_simple_runtime_resume, NULL)
 188 };
 189
 190 static const struct of_device_id of_dwc3_simple_match[] = {
 191         { .compatible = "qcom,dwc3" },
 192         { .compatible = "rockchip,rk3399-dwc3" },
 193         { .compatible = "xlnx,zynqmp-dwc3" },
 194         { .compatible = "cavium,octeon-7130-usb-uctl" },
 195         { .compatible = "sprd,sc9860-dwc3" },
 196         { /* Sentinel */ }
 197 };
 198 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 199
 200 static struct platform_driver dwc3_of_simple_driver = {
 201         .probe          = dwc3_of_simple_probe,
 202         .remove         = dwc3_of_simple_remove,
 203         .driver         = {
 204                 .name   = "dwc3-of-simple",
 205                 .of_match_table = of_dwc3_simple_match,
 206         },
 207 };
 208
 209 module_platform_driver(dwc3_of_simple_driver);
 210 MODULE_LICENSE("GPL v2");
 211 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
 212 MODULE_AUTHOR("Felipe Balbi <[email protected]>");