mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 14:10:43 +00:00
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2017 Google, Inc
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <log.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>
|
|
|
|
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),
|
|
};
|