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// SPDX-License-Identifier: GPL-2.0+
/*
* Watchdog driver for the FTWDT010 Watch Dog Driver
*
* (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
* Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
* Based on SoftDog driver by Alan Cox <alan@redhat.com>
*
* Copyright (C) 2011 Andes Technology Corporation
* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
*
* 27/11/2004 Initial release, Faraday.
* 12/01/2011 Port to u-boot, Macpaul Lin.
* 22/08/2022 Port to DM
*/
#include <common.h>
#include <dm.h>
#include <wdt.h>
#include <log.h>
#include <asm/io.h>
#include <faraday/ftwdt010_wdt.h>
struct ftwdt010_wdt_priv {
struct ftwdt010_wdt __iomem *regs;
};
static int ftwdt010_wdt_reset(struct udevice *dev)
{
struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
struct ftwdt010_wdt *wd = priv->regs;
debug("Reset WDT..\n");
/* clear control register */
writel(0, &wd->wdcr);
/* Write Magic number */
writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
/* Enable WDT */
writel(FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE, &wd->wdcr);
return 0;
}
/*
* Set the watchdog time interval and start the timer.
* Counter is 32 bit.
*/
static int ftwdt010_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
struct ftwdt010_wdt *wd = priv->regs;
unsigned int reg;
debug("Activating WDT %llu ms\n", timeout_ms);
/* Check if disabled */
if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
printf("sorry, watchdog is disabled\n");
return -1;
}
/*
* In a 66MHz system,
* if you set WDLOAD as 0x03EF1480 (66000000)
* the reset timer is 1 second.
*/
reg = FTWDT010_WDLOAD(timeout_ms * FTWDT010_TIMEOUT_FACTOR);
writel(reg, &wd->wdload);
return ftwdt010_wdt_reset(dev);
}
static int ftwdt010_wdt_stop(struct udevice *dev)
{
struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
struct ftwdt010_wdt *wd = priv->regs;
debug("Deactivating WDT..\n");
/*
* It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
*
* Shut off the timer.
* Lock it in if it's a module and we defined ...NOWAYOUT
*/
writel(0, &wd->wdcr);
return 0;
}
static int ftwdt010_wdt_expire_now(struct udevice *dev, ulong flags)
{
struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
struct ftwdt010_wdt *wd = priv->regs;
debug("Expiring WDT..\n");
writel(FTWDT010_WDLOAD(0), &wd->wdload);
return ftwdt010_wdt_reset(dev);
}
static int ftwdt010_wdt_probe(struct udevice *dev)
{
struct ftwdt010_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 ftwdt010_wdt_ops = {
.start = ftwdt010_wdt_start,
.reset = ftwdt010_wdt_reset,
.stop = ftwdt010_wdt_stop,
.expire_now = ftwdt010_wdt_expire_now,
};
static const struct udevice_id ftwdt010_wdt_ids[] = {
{ .compatible = "faraday,ftwdt010" },
{}
};
U_BOOT_DRIVER(ftwdt010_wdt) = {
.name = "ftwdt010_wdt",
.id = UCLASS_WDT,
.of_match = ftwdt010_wdt_ids,
.ops = &ftwdt010_wdt_ops,
.probe = ftwdt010_wdt_probe,
.priv_auto = sizeof(struct ftwdt010_wdt_priv),
};
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