git.sur5r.net Git - u-boot/blob - 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 struct dwc3_of_simple {
  21         struct clk_bulk         clks;
  22         struct reset_ctl_bulk   resets;
  23 };
  24
  25 static int dwc3_of_simple_reset_init(struct udevice *dev,
  26                                      struct dwc3_of_simple *simple)
  27 {
  28         int ret;
  29
  30         ret = reset_get_bulk(dev, &simple->resets);
  31         if (ret == -ENOTSUPP)
  32                 return 0;
  33         else if (ret)
  34                 return ret;
  35
  36         ret = reset_deassert_bulk(&simple->resets);
  37         if (ret) {
  38                 reset_release_bulk(&simple->resets);
  39                 return ret;
  40         }
  41
  42         return 0;
  43 }
  44
  45 static int dwc3_of_simple_clk_init(struct udevice *dev,
  46                                    struct dwc3_of_simple *simple)
  47 {
  48         int ret;
  49
  50         ret = clk_get_bulk(dev, &simple->clks);
  51         if (ret == -ENOSYS)
  52                 return 0;
  53         if (ret)
  54                 return ret;
  55
  56 #if CONFIG_IS_ENABLED(CLK)
  57         ret = clk_enable_bulk(&simple->clks);
  58         if (ret) {
  59                 clk_release_bulk(&simple->clks);
  60                 return ret;
  61         }
  62 #endif
  63
  64         return 0;
  65 }
  66
  67 static int dwc3_of_simple_probe(struct udevice *dev)
  68 {
  69         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  70         int ret;
  71
  72         ret = dwc3_of_simple_clk_init(dev, simple);
  73         if (ret)
  74                 return ret;
  75
  76         ret = dwc3_of_simple_reset_init(dev, simple);
  77         if (ret)
  78                 return ret;
  79
  80         return 0;
  81 }
  82
  83 static int dwc3_of_simple_remove(struct udevice *dev)
  84 {
  85         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  86
  87         reset_release_bulk(&simple->resets);
  88
  89         clk_release_bulk(&simple->clks);
  90
  91         return dm_scan_fdt_dev(dev);
  92 }
  93
  94 static const struct udevice_id dwc3_of_simple_ids[] = {
  95         { .compatible = "amlogic,meson-gxl-dwc3" },
  96         { .compatible = "ti,dwc3" },
  97         { }
  98 };
  99
 100 U_BOOT_DRIVER(dwc3_of_simple) = {
 101         .name = "dwc3-of-simple",
 102         .id = UCLASS_SIMPLE_BUS,
 103         .of_match = dwc3_of_simple_ids,
 104         .probe = dwc3_of_simple_probe,
 105         .remove = dwc3_of_simple_remove,
 106         .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
 107         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 108 };