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/*
* Copyright 2017 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <dm.h>
#include <misc.h>
#include <reset.h>
#include <reset-uclass.h>
#include <wdt.h>
#include <asm/io.h>
#include <asm/arch/scu_ast2500.h>
#include <asm/arch/wdt.h>
DECLARE_GLOBAL_DATA_PTR;
struct ast2500_reset_priv {
/* WDT used to perform resets. */
struct udevice *wdt;
struct ast2500_scu *scu;
};
static int ast2500_ofdata_to_platdata(struct udevice *dev)
{
struct ast2500_reset_priv *priv = dev_get_priv(dev);
int ret;
ret = uclass_get_device_by_phandle(UCLASS_WDT, dev, "aspeed,wdt",
&priv->wdt);
if (ret) {
debug("%s: can't find WDT for reset controller", __func__);
return ret;
}
return 0;
}
static int ast2500_reset_assert(struct reset_ctl *reset_ctl)
{
struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
u32 reset_mode, reset_mask;
bool reset_sdram;
int ret;
/*
* To reset SDRAM, a specifal flag in SYSRESET register
* needs to be enabled first
*/
reset_mode = ast_reset_mode_from_flags(reset_ctl->id);
reset_mask = ast_reset_mask_from_flags(reset_ctl->id);
reset_sdram = reset_mode == WDT_CTRL_RESET_SOC &&
(reset_mask & WDT_RESET_SDRAM);
if (reset_sdram) {
ast_scu_unlock(priv->scu);
setbits_le32(&priv->scu->sysreset_ctrl1,
SCU_SYSRESET_SDRAM_WDT);
ret = wdt_expire_now(priv->wdt, reset_ctl->id);
clrbits_le32(&priv->scu->sysreset_ctrl1,
SCU_SYSRESET_SDRAM_WDT);
ast_scu_lock(priv->scu);
} else {
ret = wdt_expire_now(priv->wdt, reset_ctl->id);
}
return ret;
}
static int ast2500_reset_request(struct reset_ctl *reset_ctl)
{
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
reset_ctl->dev, reset_ctl->id);
return 0;
}
static int ast2500_reset_probe(struct udevice *dev)
{
struct ast2500_reset_priv *priv = dev_get_priv(dev);
priv->scu = ast_get_scu();
return 0;
}
static const struct udevice_id ast2500_reset_ids[] = {
{ .compatible = "aspeed,ast2500-reset" },
{ }
};
struct reset_ops ast2500_reset_ops = {
.rst_assert = ast2500_reset_assert,
.request = ast2500_reset_request,
};
U_BOOT_DRIVER(ast2500_reset) = {
.name = "ast2500_reset",
.id = UCLASS_RESET,
.of_match = ast2500_reset_ids,
.probe = ast2500_reset_probe,
.ops = &ast2500_reset_ops,
.ofdata_to_platdata = ast2500_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct ast2500_reset_priv),
};
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