LXR uboot/drivers/reset/reset-bcm6345.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   4 *
   5 * Derived from linux/arch/mips/bcm63xx/reset.c:
   6 *      Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
   7 */
   8
   9#include <common.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <reset-uclass.h>
  13#include <asm/io.h>
  14
  15#define MAX_RESETS      32
  16
  17struct bcm6345_reset_priv {
  18        void __iomem *regs;
  19};
  20
  21static int bcm6345_reset_assert(struct reset_ctl *rst)
  22{
  23        struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
  24
  25        clrbits_be32(priv->regs, BIT(rst->id));
  26        mdelay(20);
  27
  28        return 0;
  29}
  30
  31static int bcm6345_reset_deassert(struct reset_ctl *rst)
  32{
  33        struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
  34
  35        setbits_be32(priv->regs, BIT(rst->id));
  36        mdelay(20);
  37
  38        return 0;
  39}
  40
  41static int bcm6345_reset_free(struct reset_ctl *rst)
  42{
  43        return 0;
  44}
  45
  46static int bcm6345_reset_request(struct reset_ctl *rst)
  47{
  48        if (rst->id >= MAX_RESETS)
  49                return -EINVAL;
  50
  51        return bcm6345_reset_assert(rst);
  52}
  53
  54struct reset_ops bcm6345_reset_reset_ops = {
  55        .free = bcm6345_reset_free,
  56        .request = bcm6345_reset_request,
  57        .rst_assert = bcm6345_reset_assert,
  58        .rst_deassert = bcm6345_reset_deassert,
  59};
  60
  61static const struct udevice_id bcm6345_reset_ids[] = {
  62        { .compatible = "brcm,bcm6345-reset" },
  63        { /* sentinel */ }
  64};
  65
  66static int bcm6345_reset_probe(struct udevice *dev)
  67{
  68        struct bcm6345_reset_priv *priv = dev_get_priv(dev);
  69
  70        priv->regs = dev_remap_addr(dev);
  71        if (!priv->regs)
  72                return -EINVAL;
  73
  74        return 0;
  75}
  76
  77U_BOOT_DRIVER(bcm6345_reset) = {
  78        .name = "bcm6345-reset",
  79        .id = UCLASS_RESET,
  80        .of_match = bcm6345_reset_ids,
  81        .ops = &bcm6345_reset_reset_ops,
  82        .probe = bcm6345_reset_probe,
  83        .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
  84};
  85