127d03893b
Fix npcm845 watchdog halt for reset function and expire function. Reset function is restart wdt. Signed-off-by: Jim Liu <JJLIU0@nuvoton.com> Reviewed-by: Stefan Roese <sr@denx.de>
129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2022 Nuvoton Technology, Inc
|
|
*/
|
|
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <log.h>
|
|
#include <wdt.h>
|
|
#include <asm/io.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
|
|
#define NPCM_WTCLK (BIT(10) | BIT(11)) /* Clock divider */
|
|
#define NPCM_WTE BIT(7) /* Enable */
|
|
#define NPCM_WTIE BIT(6) /* Enable irq */
|
|
#define NPCM_WTIS (BIT(4) | BIT(5)) /* Interval selection */
|
|
#define NPCM_WTIF BIT(3) /* Interrupt flag*/
|
|
#define NPCM_WTRF BIT(2) /* Reset flag */
|
|
#define NPCM_WTRE BIT(1) /* Reset enable */
|
|
#define NPCM_WTR BIT(0) /* Reset counter */
|
|
|
|
struct npcm_wdt_priv {
|
|
void __iomem *regs;
|
|
};
|
|
|
|
static int npcm_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
|
|
{
|
|
struct npcm_wdt_priv *priv = dev_get_priv(dev);
|
|
u32 time_out, val;
|
|
|
|
time_out = (u32)(timeout_ms) / 1000;
|
|
if (time_out < 2)
|
|
val = 0x800;
|
|
else if (time_out < 3)
|
|
val = 0x420;
|
|
else if (time_out < 6)
|
|
val = 0x810;
|
|
else if (time_out < 11)
|
|
val = 0x430;
|
|
else if (time_out < 22)
|
|
val = 0x820;
|
|
else if (time_out < 44)
|
|
val = 0xc00;
|
|
else if (time_out < 87)
|
|
val = 0x830;
|
|
else if (time_out < 173)
|
|
val = 0xc10;
|
|
else if (time_out < 688)
|
|
val = 0xc20;
|
|
else
|
|
val = 0xc30;
|
|
|
|
val |= NPCM_WTRE | NPCM_WTE | NPCM_WTR | NPCM_WTIE;
|
|
writel(val, priv->regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int npcm_wdt_stop(struct udevice *dev)
|
|
{
|
|
struct npcm_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(0, priv->regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int npcm_wdt_reset(struct udevice *dev)
|
|
{
|
|
struct npcm_wdt_priv *priv = dev_get_priv(dev);
|
|
u32 val;
|
|
|
|
val = readl(priv->regs);
|
|
writel(val | NPCM_WTR, priv->regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int npcm_wdt_expire_now(struct udevice *dev, ulong flags)
|
|
{
|
|
struct npcm_wdt_priv *priv = dev_get_priv(dev);
|
|
|
|
writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, priv->regs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int npcm_wdt_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct npcm_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 npcm_wdt_ops = {
|
|
.expire_now = npcm_wdt_expire_now,
|
|
.start = npcm_wdt_start,
|
|
.reset = npcm_wdt_reset,
|
|
.stop = npcm_wdt_stop,
|
|
};
|
|
|
|
static const struct udevice_id npcm_wdt_ids[] = {
|
|
{ .compatible = "nuvoton,npcm750-wdt" },
|
|
{ }
|
|
};
|
|
|
|
static int npcm_wdt_probe(struct udevice *dev)
|
|
{
|
|
debug("%s() wdt%u\n", __func__, dev_seq(dev));
|
|
npcm_wdt_stop(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(npcm_wdt) = {
|
|
.name = "npcm_wdt",
|
|
.id = UCLASS_WDT,
|
|
.of_match = npcm_wdt_ids,
|
|
.probe = npcm_wdt_probe,
|
|
.priv_auto = sizeof(struct npcm_wdt_priv),
|
|
.of_to_plat = npcm_wdt_of_to_plat,
|
|
.ops = &npcm_wdt_ops,
|
|
};
|