git.sur5r.net Git - u-boot/blob - drivers/usb/host/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  * Copyright (C) 2018 BayLibre, SAS
  10  * Author: Neil Armstrong <narmstron@baylibre.com>
  11  */
  12
  13 #include <common.h>
  14 #include <dm.h>
  15 #include <fdtdec.h>
  16 #include <reset.h>
  17 #include <clk.h>
  18
  19 struct dwc3_of_simple {
  20         struct clk_bulk         clks;
  21         struct reset_ctl_bulk   resets;
  22 };
  23
  24 static int dwc3_of_simple_reset_init(struct udevice *dev,
  25                                      struct dwc3_of_simple *simple)
  26 {
  27         int ret;
  28
  29         ret = reset_get_bulk(dev, &simple->resets);
  30         if (ret == -ENOTSUPP)
  31                 return 0;
  32         else if (ret)
  33                 return ret;
  34
  35         ret = reset_deassert_bulk(&simple->resets);
  36         if (ret) {
  37                 reset_release_bulk(&simple->resets);
  38                 return ret;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int dwc3_of_simple_clk_init(struct udevice *dev,
  45                                    struct dwc3_of_simple *simple)
  46 {
  47         int ret;
  48
  49         ret = clk_get_bulk(dev, &simple->clks);
  50         if (ret == -ENOSYS)
  51                 return 0;
  52         if (ret)
  53                 return ret;
  54
  55 #if CONFIG_IS_ENABLED(CLK)
  56         ret = clk_enable_bulk(&simple->clks);
  57         if (ret) {
  58                 clk_release_bulk(&simple->clks);
  59                 return ret;
  60         }
  61 #endif
  62
  63         return 0;
  64 }
  65
  66 static int dwc3_of_simple_probe(struct udevice *dev)
  67 {
  68         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  69         int ret;
  70
  71         ret = dwc3_of_simple_clk_init(dev, simple);
  72         if (ret)
  73                 return ret;
  74
  75         ret = dwc3_of_simple_reset_init(dev, simple);
  76         if (ret)
  77                 return ret;
  78
  79         return 0;
  80 }
  81
  82 static int dwc3_of_simple_remove(struct udevice *dev)
  83 {
  84         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  85
  86         reset_release_bulk(&simple->resets);
  87
  88         clk_release_bulk(&simple->clks);
  89
  90         return dm_scan_fdt_dev(dev);
  91 }
  92
  93 static const struct udevice_id dwc3_of_simple_ids[] = {
  94         { .compatible = "amlogic,meson-gxl-dwc3" },
  95         { .compatible = "ti,dwc3" },
  96         { }
  97 };
  98
  99 U_BOOT_DRIVER(dwc3_of_simple) = {
 100         .name = "dwc3-of-simple",
 101         .id = UCLASS_SIMPLE_BUS,
 102         .of_match = dwc3_of_simple_ids,
 103         .probe = dwc3_of_simple_probe,
 104         .remove = dwc3_of_simple_remove,
 105         .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
 106         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 107 };