drivers/usb/host/dwc3-of-simple.c

   1 /*
   2  * dwc3-of-simple.c - OF glue layer for simple integrations
   3  *
   4  * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Author: Felipe Balbi <balbi@ti.com>
   7  *
   8  * Copyright (C) 2018 BayLibre, SAS
   9  * Author: Neil Armstrong <narmstron@baylibre.com>
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <dm.h>
  16 #include <fdtdec.h>
  17 #include <reset.h>
  18 #include <clk.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 struct dwc3_of_simple {
  23         struct clk_bulk         clks;
  24         struct reset_ctl_bulk   resets;
  25 };
  26
  27 static int dwc3_of_simple_reset_init(struct udevice *dev,
  28                                      struct dwc3_of_simple *simple)
  29 {
  30         int ret;
  31
  32         ret = reset_get_bulk(dev, &simple->resets);
  33         if (ret == -ENOTSUPP)
  34                 return 0;
  35         else if (ret)
  36                 return ret;
  37
  38         ret = reset_deassert_bulk(&simple->resets);
  39         if (ret) {
  40                 reset_release_bulk(&simple->resets);
  41                 return ret;
  42         }
  43
  44         return 0;
  45 }
  46
  47 static int dwc3_of_simple_clk_init(struct udevice *dev,
  48                                    struct dwc3_of_simple *simple)
  49 {
  50         int ret;
  51
  52         ret = clk_get_bulk(dev, &simple->clks);
  53         if (ret == -ENOSYS)
  54                 return 0;
  55         if (ret)
  56                 return ret;
  57
  58 #if CONFIG_IS_ENABLED(CLK)
  59         ret = clk_enable_bulk(&simple->clks);
  60         if (ret) {
  61                 clk_release_bulk(&simple->clks);
  62                 return ret;
  63         }
  64 #endif
  65
  66         return 0;
  67 }
  68
  69 static int dwc3_of_simple_probe(struct udevice *dev)
  70 {
  71         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  72         int ret;
  73
  74         ret = dwc3_of_simple_clk_init(dev, simple);
  75         if (ret)
  76                 return ret;
  77
  78         ret = dwc3_of_simple_reset_init(dev, simple);
  79         if (ret)
  80                 return ret;
  81
  82         return 0;
  83 }
  84
  85 static int dwc3_of_simple_remove(struct udevice *dev)
  86 {
  87         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  88
  89         reset_release_bulk(&simple->resets);
  90
  91         clk_release_bulk(&simple->clks);
  92
  93         return dm_scan_fdt_dev(dev);
  94 }
  95
  96 static const struct udevice_id dwc3_of_simple_ids[] = {
  97         { .compatible = "amlogic,meson-gxl-dwc3" },
  98         { .compatible = "ti,dwc3" },
  99         { }
 100 };
 101
 102 U_BOOT_DRIVER(dwc3_of_simple) = {
 103         .name = "dwc3-of-simple",
 104         .id = UCLASS_SIMPLE_BUS,
 105         .of_match = dwc3_of_simple_ids,
 106         .probe = dwc3_of_simple_probe,
 107         .remove = dwc3_of_simple_remove,
 108         .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
 109         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 110 };