c5f5ee3732
The udelay() function in lib/time.c contains a WATCHDOG_RESET()
call. So use __udelay() in max6370_wdt.c to prevent recursion.
Fixes: 0a095fc53b ("watchdog: Add MAX6370 watchdog timer driver")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
// (C) 2022 Pali Rohár <pali@kernel.org>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm-generic/gpio.h>
|
|
#include <dm.h>
|
|
#include <linux/delay.h>
|
|
#include <wdt.h>
|
|
|
|
#define MAX6370_SET_MASK 0x7
|
|
#define MAX6370_SET_1MS 0x0
|
|
#define MAX6370_SET_10MS 0x1
|
|
#define MAX6370_SET_30MS 0x2
|
|
#define MAX6370_SET_DISABLE 0x3
|
|
#define MAX6370_SET_100MS 0x4
|
|
#define MAX6370_SET_1S 0x5
|
|
#define MAX6370_SET_10S 0x6
|
|
#define MAX6370_SET_60S 0x7
|
|
|
|
#define MAX6370_WDI 0x8
|
|
|
|
struct max6370_wdt {
|
|
void __iomem *reg;
|
|
struct gpio_desc gpio_wdi;
|
|
};
|
|
|
|
static int max6370_wdt_start(struct udevice *dev, u64 ms, ulong flags)
|
|
{
|
|
struct max6370_wdt *wdt = dev_get_priv(dev);
|
|
u8 val;
|
|
|
|
val = readb(wdt->reg);
|
|
val &= ~MAX6370_SET_MASK;
|
|
|
|
if (ms <= 1)
|
|
val |= MAX6370_SET_1MS;
|
|
else if (ms <= 10)
|
|
val |= MAX6370_SET_10MS;
|
|
else if (ms <= 30)
|
|
val |= MAX6370_SET_30MS;
|
|
else if (ms <= 100)
|
|
val |= MAX6370_SET_100MS;
|
|
else if (ms <= 1000)
|
|
val |= MAX6370_SET_1S;
|
|
else if (ms <= 10000)
|
|
val |= MAX6370_SET_10S;
|
|
else
|
|
val |= MAX6370_SET_60S;
|
|
|
|
writeb(val, wdt->reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6370_wdt_stop(struct udevice *dev)
|
|
{
|
|
struct max6370_wdt *wdt = dev_get_priv(dev);
|
|
u8 val;
|
|
|
|
val = readb(wdt->reg);
|
|
val &= ~MAX6370_SET_MASK;
|
|
val |= MAX6370_SET_DISABLE;
|
|
writeb(val, wdt->reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6370_wdt_reset(struct udevice *dev)
|
|
{
|
|
struct max6370_wdt *wdt = dev_get_priv(dev);
|
|
u8 val;
|
|
|
|
if (dm_gpio_is_valid(&wdt->gpio_wdi)) {
|
|
dm_gpio_set_value(&wdt->gpio_wdi, 1);
|
|
__udelay(1);
|
|
dm_gpio_set_value(&wdt->gpio_wdi, 0);
|
|
} else {
|
|
val = readb(wdt->reg);
|
|
writeb(val | MAX6370_WDI, wdt->reg);
|
|
writeb(val & ~MAX6370_WDI, wdt->reg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6370_wdt_probe(struct udevice *dev)
|
|
{
|
|
struct max6370_wdt *wdt = dev_get_priv(dev);
|
|
|
|
wdt->reg = dev_read_addr_ptr(dev);
|
|
if (!wdt->reg)
|
|
return -EINVAL;
|
|
|
|
/* WDI gpio is optional */
|
|
gpio_request_by_name(dev, "gpios", 0, &wdt->gpio_wdi, GPIOD_IS_OUT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct wdt_ops max6370_wdt_ops = {
|
|
.start = max6370_wdt_start,
|
|
.stop = max6370_wdt_stop,
|
|
.reset = max6370_wdt_reset,
|
|
};
|
|
|
|
static const struct udevice_id max6370_wdt_ids[] = {
|
|
{ .compatible = "maxim,max6370" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(max6370_wdt) = {
|
|
.name = "max6370_wdt",
|
|
.id = UCLASS_WDT,
|
|
.of_match = max6370_wdt_ids,
|
|
.probe = max6370_wdt_probe,
|
|
.priv_auto = sizeof(struct max6370_wdt),
|
|
.ops = &max6370_wdt_ops,
|
|
};
|