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         bool                    pulse_resets;
  31 };
  32
  33 static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
  34 {
  35         struct device           *dev = simple->dev;
  36         struct device_node      *np = dev->of_node;
  37         int                     i;
  38
  39         simple->num_clocks = count;
  40
  41         if (!count)
  42                 return 0;
  43
  44         simple->clks = devm_kcalloc(dev, simple->num_clocks,
  45                         sizeof(struct clk *), GFP_KERNEL);
  46         if (!simple->clks)
  47                 return -ENOMEM;
  48
  49         for (i = 0; i < simple->num_clocks; i++) {
  50                 struct clk      *clk;
  51                 int             ret;
  52
  53                 clk = of_clk_get(np, i);
  54                 if (IS_ERR(clk)) {
  55                         while (--i >= 0) {
  56                                 clk_disable_unprepare(simple->clks[i]);
  57                                 clk_put(simple->clks[i]);
  58                         }
  59                         return PTR_ERR(clk);
  60                 }
  61
  62                 ret = clk_prepare_enable(clk);
  63                 if (ret < 0) {
  64                         while (--i >= 0) {
  65                                 clk_disable_unprepare(simple->clks[i]);
  66                                 clk_put(simple->clks[i]);
  67                         }
  68                         clk_put(clk);
  69
  70                         return ret;
  71                 }
  72
  73                 simple->clks[i] = clk;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int dwc3_of_simple_probe(struct platform_device *pdev)
  80 {
  81         struct dwc3_of_simple   *simple;
  82         struct device           *dev = &pdev->dev;
  83         struct device_node      *np = dev->of_node;
  84
  85         int                     ret;
  86         int                     i;
  87         bool                    shared_resets = false;
  88
  89         simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
  90         if (!simple)
  91                 return -ENOMEM;
  92
  93         platform_set_drvdata(pdev, simple);
  94         simple->dev = dev;
  95
  96         if (of_device_is_compatible(np, "amlogic,meson-axg-dwc3") ||
  97             of_device_is_compatible(np, "amlogic,meson-gxl-dwc3")) {
  98                 shared_resets = true;
  99                 simple->pulse_resets = true;
 100         }
 101
 102         simple->resets = of_reset_control_array_get(np, shared_resets, true);
 103         if (IS_ERR(simple->resets)) {
 104                 ret = PTR_ERR(simple->resets);
 105                 dev_err(dev, "failed to get device resets, err=%d\n", ret);
 106                 return ret;
 107         }
 108
 109         if (simple->pulse_resets) {
 110                 ret = reset_control_reset(simple->resets);
 111                 if (ret)
 112                         goto err_resetc_put;
 113         } else {
 114                 ret = reset_control_deassert(simple->resets);
 115                 if (ret)
 116                         goto err_resetc_put;
 117         }
 118
 119         ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
 120                                                 "clocks", "#clock-cells"));
 121         if (ret)
 122                 goto err_resetc_assert;
 123
 124         ret = of_platform_populate(np, NULL, NULL, dev);
 125         if (ret) {
 126                 for (i = 0; i < simple->num_clocks; i++) {
 127                         clk_disable_unprepare(simple->clks[i]);
 128                         clk_put(simple->clks[i]);
 129                 }
 130
 131                 goto err_resetc_assert;
 132         }
 133
 134         pm_runtime_set_active(dev);
 135         pm_runtime_enable(dev);
 136         pm_runtime_get_sync(dev);
 137
 138         return 0;
 139
 140 err_resetc_assert:
 141         if (!simple->pulse_resets)
 142                 reset_control_assert(simple->resets);
 143
 144 err_resetc_put:
 145         reset_control_put(simple->resets);
 146         return ret;
 147 }
 148
 149 static int dwc3_of_simple_remove(struct platform_device *pdev)
 150 {
 151         struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);
 152         struct device           *dev = &pdev->dev;
 153         int                     i;
 154
 155         of_platform_depopulate(dev);
 156
 157         for (i = 0; i < simple->num_clocks; i++) {
 158                 clk_disable_unprepare(simple->clks[i]);
 159                 clk_put(simple->clks[i]);
 160         }
 161         simple->num_clocks = 0;
 162
 163         if (!simple->pulse_resets)
 164                 reset_control_assert(simple->resets);
 165
 166         reset_control_put(simple->resets);
 167
 168         pm_runtime_put_sync(dev);
 169         pm_runtime_disable(dev);
 170
 171         return 0;
 172 }
 173
 174 #ifdef CONFIG_PM
 175 static int dwc3_of_simple_runtime_suspend(struct device *dev)
 176 {
 177         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 178         int                     i;
 179
 180         for (i = 0; i < simple->num_clocks; i++)
 181                 clk_disable(simple->clks[i]);
 182
 183         return 0;
 184 }
 185
 186 static int dwc3_of_simple_runtime_resume(struct device *dev)
 187 {
 188         struct dwc3_of_simple   *simple = dev_get_drvdata(dev);
 189         int                     ret;
 190         int                     i;
 191
 192         for (i = 0; i < simple->num_clocks; i++) {
 193                 ret = clk_enable(simple->clks[i]);
 194                 if (ret < 0) {
 195                         while (--i >= 0)
 196                                 clk_disable(simple->clks[i]);
 197                         return ret;
 198                 }
 199         }
 200
 201         return 0;
 202 }
 203 #endif
 204
 205 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
 206         SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
 207                         dwc3_of_simple_runtime_resume, NULL)
 208 };
 209
 210 static const struct of_device_id of_dwc3_simple_match[] = {
 211         { .compatible = "qcom,dwc3" },
 212         { .compatible = "rockchip,rk3399-dwc3" },
 213         { .compatible = "xlnx,zynqmp-dwc3" },
 214         { .compatible = "cavium,octeon-7130-usb-uctl" },
 215         { .compatible = "sprd,sc9860-dwc3" },
 216         { .compatible = "amlogic,meson-axg-dwc3" },
 217         { .compatible = "amlogic,meson-gxl-dwc3" },
 218         { /* Sentinel */ }
 219 };
 220 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 221
 222 static struct platform_driver dwc3_of_simple_driver = {
 223         .probe          = dwc3_of_simple_probe,
 224         .remove         = dwc3_of_simple_remove,
 225         .driver         = {
 226                 .name   = "dwc3-of-simple",
 227                 .of_match_table = of_dwc3_simple_match,
 228                 .pm     = &dwc3_of_simple_dev_pm_ops,
 229         },
 230 };
 231
 232 module_platform_driver(dwc3_of_simple_driver);
 233 MODULE_LICENSE("GPL v2");
 234 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
 235 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");