LXR uboot/drivers/reset/reset-ast2500.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright 2017 Google, Inc
   4 * Copyright 2020 ASPEED Technology Inc.
   5 */
   6
   7#include <common.h>
   8#include <dm.h>
   9#include <log.h>
  10#include <misc.h>
  11#include <reset.h>
  12#include <reset-uclass.h>
  13#include <linux/err.h>
  14#include <asm/io.h>
  15#include <asm/arch/scu_ast2500.h>
  16
  17struct ast2500_reset_priv {
  18        struct ast2500_scu *scu;
  19};
  20
  21static int ast2500_reset_request(struct reset_ctl *reset_ctl)
  22{
  23        debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  24              reset_ctl->dev, reset_ctl->id);
  25
  26        return 0;
  27}
  28
  29static int ast2500_reset_free(struct reset_ctl *reset_ctl)
  30{
  31        debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  32              reset_ctl->dev, reset_ctl->id);
  33
  34        return 0;
  35}
  36
  37static int ast2500_reset_assert(struct reset_ctl *reset_ctl)
  38{
  39        struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  40        struct ast2500_scu *scu = priv->scu;
  41
  42        debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
  43
  44        if (reset_ctl->id < 32)
  45                setbits_le32(&scu->sysreset_ctrl1, BIT(reset_ctl->id));
  46        else
  47                setbits_le32(&scu->sysreset_ctrl2, BIT(reset_ctl->id - 32));
  48
  49        return 0;
  50}
  51
  52static int ast2500_reset_deassert(struct reset_ctl *reset_ctl)
  53{
  54        struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  55        struct ast2500_scu *scu = priv->scu;
  56
  57        debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
  58
  59        if (reset_ctl->id < 32)
  60                clrbits_le32(&scu->sysreset_ctrl1, BIT(reset_ctl->id));
  61        else
  62                clrbits_le32(&scu->sysreset_ctrl2, BIT(reset_ctl->id - 32));
  63
  64        return 0;
  65}
  66
  67static int ast2500_reset_probe(struct udevice *dev)
  68{
  69        int rc;
  70        struct ast2500_reset_priv *priv = dev_get_priv(dev);
  71        struct udevice *scu_dev;
  72
  73        /* get SCU base from clock device */
  74        rc = uclass_get_device_by_driver(UCLASS_CLK,
  75                                         DM_DRIVER_GET(aspeed_ast2500_scu), &scu_dev);
  76        if (rc) {
  77                debug("%s: clock device not found, rc=%d\n", __func__, rc);
  78                return rc;
  79        }
  80
  81        priv->scu = devfdt_get_addr_ptr(scu_dev);
  82        if (IS_ERR_OR_NULL(priv->scu)) {
  83                debug("%s: invalid SCU base pointer\n", __func__);
  84                return PTR_ERR(priv->scu);
  85        }
  86
  87        return 0;
  88}
  89
  90static const struct udevice_id ast2500_reset_ids[] = {
  91        { .compatible = "aspeed,ast2500-reset" },
  92        { }
  93};
  94
  95struct reset_ops ast2500_reset_ops = {
  96        .request = ast2500_reset_request,
  97        .rfree = ast2500_reset_free,
  98        .rst_assert = ast2500_reset_assert,
  99        .rst_deassert = ast2500_reset_deassert,
 100};
 101
 102U_BOOT_DRIVER(ast2500_reset) = {
 103        .name = "ast2500_reset",
 104        .id = UCLASS_RESET,
 105        .of_match = ast2500_reset_ids,
 106        .probe = ast2500_reset_probe,
 107        .ops = &ast2500_reset_ops,
 108        .priv_auto      = sizeof(struct ast2500_reset_priv),
 109};
 110