LXR uboot/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 <reset.h>
  16#include <clk.h>
  17
  18struct dwc3_of_simple {
  19        struct clk_bulk         clks;
  20        struct reset_ctl_bulk   resets;
  21};
  22
  23static int dwc3_of_simple_reset_init(struct udevice *dev,
  24                                     struct dwc3_of_simple *simple)
  25{
  26        int ret;
  27
  28        ret = reset_get_bulk(dev, &simple->resets);
  29        if (ret == -ENOTSUPP)
  30                return 0;
  31        else if (ret)
  32                return ret;
  33
  34        ret = reset_deassert_bulk(&simple->resets);
  35        if (ret) {
  36                reset_release_bulk(&simple->resets);
  37                return ret;
  38        }
  39
  40        return 0;
  41}
  42
  43static int dwc3_of_simple_clk_init(struct udevice *dev,
  44                                   struct dwc3_of_simple *simple)
  45{
  46        int ret;
  47
  48        ret = clk_get_bulk(dev, &simple->clks);
  49        if (ret == -ENOSYS)
  50                return 0;
  51        if (ret)
  52                return ret;
  53
  54#if CONFIG_IS_ENABLED(CLK)
  55        ret = clk_enable_bulk(&simple->clks);
  56        if (ret) {
  57                clk_release_bulk(&simple->clks);
  58                return ret;
  59        }
  60#endif
  61
  62        return 0;
  63}
  64
  65static int dwc3_of_simple_probe(struct udevice *dev)
  66{
  67        struct dwc3_of_simple *simple = dev_get_plat(dev);
  68        int ret;
  69
  70        ret = dwc3_of_simple_clk_init(dev, simple);
  71        if (ret)
  72                return ret;
  73
  74        ret = dwc3_of_simple_reset_init(dev, simple);
  75        if (ret)
  76                return ret;
  77
  78        return 0;
  79}
  80
  81static int dwc3_of_simple_remove(struct udevice *dev)
  82{
  83        struct dwc3_of_simple *simple = dev_get_plat(dev);
  84
  85        reset_release_bulk(&simple->resets);
  86
  87        clk_release_bulk(&simple->clks);
  88
  89        return dm_scan_fdt_dev(dev);
  90}
  91
  92static const struct udevice_id dwc3_of_simple_ids[] = {
  93        { .compatible = "amlogic,meson-gxl-dwc3" },
  94        { .compatible = "rockchip,rk3399-dwc3" },
  95        { .compatible = "ti,dwc3" },
  96        { }
  97};
  98
  99U_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        .plat_auto      = sizeof(struct dwc3_of_simple),
 106        .flags = DM_FLAG_ALLOC_PRIV_DMA,
 107};
 108