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 <log.h>
  12#include <malloc.h>
  13#include <reset-uclass.h>
  14#include <linux/bitops.h>
  15#include <linux/io.h>
  16
  17struct mtmips_reset_priv {
  18        void __iomem *base;
  19};
  20
  21static int mtmips_reset_request(struct reset_ctl *reset_ctl)
  22{
  23        return 0;
  24}
  25
  26static int mtmips_reset_free(struct reset_ctl *reset_ctl)
  27{
  28        return 0;
  29}
  30
  31static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
  32{
  33        struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  34
  35        setbits_32(priv->base, BIT(reset_ctl->id));
  36
  37        return 0;
  38}
  39
  40static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
  41{
  42        struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  43
  44        clrbits_32(priv->base, BIT(reset_ctl->id));
  45
  46        return 0;
  47}
  48
  49static const struct reset_ops mtmips_reset_ops = {
  50        .request        = mtmips_reset_request,
  51        .rfree          = mtmips_reset_free,
  52        .rst_assert     = mtmips_reset_assert,
  53        .rst_deassert   = mtmips_reset_deassert,
  54};
  55
  56static int mtmips_reset_probe(struct udevice *dev)
  57{
  58        return 0;
  59}
  60
  61static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
  62{
  63        struct mtmips_reset_priv *priv = dev_get_priv(dev);
  64
  65        priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
  66        if (!priv->base)
  67                return -EINVAL;
  68
  69        return 0;
  70}
  71
  72static const struct udevice_id mtmips_reset_ids[] = {
  73        { .compatible = "mediatek,mtmips-reset" },
  74        { }
  75};
  76
  77U_BOOT_DRIVER(mtmips_reset) = {
  78        .name = "mtmips-reset",
  79        .id = UCLASS_RESET,
  80        .of_match = mtmips_reset_ids,
  81        .ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
  82        .probe = mtmips_reset_probe,
  83        .priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
  84        .ops = &mtmips_reset_ops,
  85};
  86