mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
337d95c4aa
AST2600 has 8 watchdog timers including 8 sets of 32-bit decrement counters, based on 1MHz clock. A 64-bit reset mask is also supported to specify which controllers should be reset by the WDT reset. Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com> Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2020 Aspeed Technology, Inc
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <log.h>
|
|
#include <wdt.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/wdt_ast2600.h>
|
|
#include <linux/err.h>
|
|
|
|
struct ast2600_wdt_priv {
|
|
struct ast2600_wdt *regs;
|
|
};
|
|
|
|
static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
|
|
{
|
|
struct ast2600_wdt_priv *priv = dev_get_priv(dev);
|
|
struct ast2600_wdt *wdt = priv->regs;
|
|
|
|
/* WDT counts in the 1MHz frequency, namely 1us */
|
|
writel((u32)(timeout_ms * 1000), &wdt->counter_reload_val);
|
|
writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
|
|
writel(WDT_CTRL_EN | WDT_CTRL_RESET, &wdt->ctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ast2600_wdt_stop(struct udevice *dev)
|
|
{
|
|
struct ast2600_wdt_priv *priv = dev_get_priv(dev);
|
|
struct ast2600_wdt *wdt = priv->regs;
|
|
|
|
clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
|
|
|
|
writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
|
|
writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ast2600_wdt_reset(struct udevice *dev)
|
|
{
|
|
struct ast2600_wdt_priv *priv = dev_get_priv(dev);
|
|
struct ast2600_wdt *wdt = priv->regs;
|
|
|
|
writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
|
|
{
|
|
int ret;
|
|
struct ast2600_wdt_priv *priv = dev_get_priv(dev);
|
|
struct ast2600_wdt *wdt = priv->regs;
|
|
|
|
ret = ast2600_wdt_start(dev, 1, flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
while (readl(&wdt->ctrl) & WDT_CTRL_EN)
|
|
;
|
|
|
|
return ast2600_wdt_stop(dev);
|
|
}
|
|
|
|
static int ast2600_wdt_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct ast2600_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
priv->regs = dev_read_addr_ptr(dev);
|
|
if (!priv->regs)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct wdt_ops ast2600_wdt_ops = {
|
|
.start = ast2600_wdt_start,
|
|
.reset = ast2600_wdt_reset,
|
|
.stop = ast2600_wdt_stop,
|
|
.expire_now = ast2600_wdt_expire_now,
|
|
};
|
|
|
|
static const struct udevice_id ast2600_wdt_ids[] = {
|
|
{ .compatible = "aspeed,ast2600-wdt" },
|
|
{ }
|
|
};
|
|
|
|
static int ast2600_wdt_probe(struct udevice *dev)
|
|
{
|
|
debug("%s() wdt%u\n", __func__, dev_seq(dev));
|
|
ast2600_wdt_stop(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(ast2600_wdt) = {
|
|
.name = "ast2600_wdt",
|
|
.id = UCLASS_WDT,
|
|
.of_match = ast2600_wdt_ids,
|
|
.probe = ast2600_wdt_probe,
|
|
.priv_auto = sizeof(struct ast2600_wdt_priv),
|
|
.of_to_plat = ast2600_wdt_of_to_plat,
|
|
.ops = &ast2600_wdt_ops,
|
|
};
|