LXR uboot/drivers/reset/reset-mtmips.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
   4 *
   5 * Author: Weijie Gao <weijie.gao@mediatek.com>
   6 */
   7
   8#include <common.h>
   9#include <dm.h>
  10#include <errno.h>
  11#include <reset-uclass.h>
  12#include <linux/io.h>
  13
  14struct mtmips_reset_priv {
  15        void __iomem *base;
  16};
  17
  18static int mtmips_reset_request(struct reset_ctl *reset_ctl)
  19{
  20        return 0;
  21}
  22
  23static int mtmips_reset_free(struct reset_ctl *reset_ctl)
  24{
  25        return 0;
  26}
  27
  28static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
  29{
  30        struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  31
  32        setbits_32(priv->base, BIT(reset_ctl->id));
  33
  34        return 0;
  35}
  36
  37static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
  38{
  39        struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  40
  41        clrbits_32(priv->base, BIT(reset_ctl->id));
  42
  43        return 0;
  44}
  45
  46static const struct reset_ops mtmips_reset_ops = {
  47        .request        = mtmips_reset_request,
  48        .free           = mtmips_reset_free,
  49        .rst_assert     = mtmips_reset_assert,
  50        .rst_deassert   = mtmips_reset_deassert,
  51};
  52
  53static int mtmips_reset_probe(struct udevice *dev)
  54{
  55        return 0;
  56}
  57
  58static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
  59{
  60        struct mtmips_reset_priv *priv = dev_get_priv(dev);
  61
  62        priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
  63        if (!priv->base)
  64                return -EINVAL;
  65
  66        return 0;
  67}
  68
  69static const struct udevice_id mtmips_reset_ids[] = {
  70        { .compatible = "mediatek,mtmips-reset" },
  71        { }
  72};
  73
  74U_BOOT_DRIVER(mtmips_reset) = {
  75        .name = "mtmips-reset",
  76        .id = UCLASS_RESET,
  77        .of_match = mtmips_reset_ids,
  78        .ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
  79        .probe = mtmips_reset_probe,
  80        .priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
  81        .ops = &mtmips_reset_ops,
  82};
  83