405 lines
10 KiB
C
405 lines
10 KiB
C
/*
|
|
* Watchdog driver for Atmel AT91SAM9x processors.
|
|
*
|
|
* Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
/*
|
|
* The Watchdog Timer Mode Register can be only written to once. If the
|
|
* timeout need to be set from Linux, be sure that the bootstrap or the
|
|
* bootloader doesn't write to this register.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_irq.h>
|
|
|
|
#include "at91sam9_wdt.h"
|
|
|
|
#define DRV_NAME "AT91SAM9 Watchdog"
|
|
|
|
#define wdt_read(wdt, field) \
|
|
__raw_readl((wdt)->base + (field))
|
|
#define wdt_write(wtd, field, val) \
|
|
__raw_writel((val), (wdt)->base + (field))
|
|
|
|
/* AT91SAM9 watchdog runs a 12bit counter @ 256Hz,
|
|
* use this to convert a watchdog
|
|
* value from/to milliseconds.
|
|
*/
|
|
#define ticks_to_hz_rounddown(t) ((((t) + 1) * HZ) >> 8)
|
|
#define ticks_to_hz_roundup(t) (((((t) + 1) * HZ) + 255) >> 8)
|
|
#define ticks_to_secs(t) (((t) + 1) >> 8)
|
|
#define secs_to_ticks(s) ((s) ? (((s) << 8) - 1) : 0)
|
|
|
|
#define WDT_MR_RESET 0x3FFF2FFF
|
|
|
|
/* Watchdog max counter value in ticks */
|
|
#define WDT_COUNTER_MAX_TICKS 0xFFF
|
|
|
|
/* Watchdog max delta/value in secs */
|
|
#define WDT_COUNTER_MAX_SECS ticks_to_secs(WDT_COUNTER_MAX_TICKS)
|
|
|
|
/* Hardware timeout in seconds */
|
|
#define WDT_HW_TIMEOUT 2
|
|
|
|
/* Timer heartbeat (500ms) */
|
|
#define WDT_TIMEOUT (HZ/2)
|
|
|
|
/* User land timeout */
|
|
#define WDT_HEARTBEAT 15
|
|
static int heartbeat;
|
|
module_param(heartbeat, int, 0);
|
|
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
|
|
"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
|
|
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
#define to_wdt(wdd) container_of(wdd, struct at91wdt, wdd)
|
|
struct at91wdt {
|
|
struct watchdog_device wdd;
|
|
void __iomem *base;
|
|
unsigned long next_heartbeat; /* the next_heartbeat for the timer */
|
|
struct timer_list timer; /* The timer that pings the watchdog */
|
|
u32 mr;
|
|
u32 mr_mask;
|
|
unsigned long heartbeat; /* WDT heartbeat in jiffies */
|
|
bool nowayout;
|
|
unsigned int irq;
|
|
};
|
|
|
|
/* ......................................................................... */
|
|
|
|
static irqreturn_t wdt_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct at91wdt *wdt = (struct at91wdt *)dev_id;
|
|
|
|
if (wdt_read(wdt, AT91_WDT_SR)) {
|
|
pr_crit("at91sam9 WDT software reset\n");
|
|
emergency_restart();
|
|
pr_crit("Reboot didn't ?????\n");
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Reload the watchdog timer. (ie, pat the watchdog)
|
|
*/
|
|
static inline void at91_wdt_reset(struct at91wdt *wdt)
|
|
{
|
|
wdt_write(wdt, AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
|
|
}
|
|
|
|
/*
|
|
* Timer tick
|
|
*/
|
|
static void at91_ping(unsigned long data)
|
|
{
|
|
struct at91wdt *wdt = (struct at91wdt *)data;
|
|
if (time_before(jiffies, wdt->next_heartbeat) ||
|
|
!watchdog_active(&wdt->wdd)) {
|
|
at91_wdt_reset(wdt);
|
|
mod_timer(&wdt->timer, jiffies + wdt->heartbeat);
|
|
} else {
|
|
pr_crit("I will reset your machine !\n");
|
|
}
|
|
}
|
|
|
|
static int at91_wdt_start(struct watchdog_device *wdd)
|
|
{
|
|
struct at91wdt *wdt = to_wdt(wdd);
|
|
/* calculate when the next userspace timeout will be */
|
|
wdt->next_heartbeat = jiffies + wdd->timeout * HZ;
|
|
return 0;
|
|
}
|
|
|
|
static int at91_wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
/* The watchdog timer hardware can not be stopped... */
|
|
return 0;
|
|
}
|
|
|
|
static int at91_wdt_set_timeout(struct watchdog_device *wdd, unsigned int new_timeout)
|
|
{
|
|
wdd->timeout = new_timeout;
|
|
return at91_wdt_start(wdd);
|
|
}
|
|
|
|
static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt)
|
|
{
|
|
u32 tmp;
|
|
u32 delta;
|
|
u32 value;
|
|
int err;
|
|
u32 mask = wdt->mr_mask;
|
|
unsigned long min_heartbeat = 1;
|
|
unsigned long max_heartbeat;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
tmp = wdt_read(wdt, AT91_WDT_MR);
|
|
if ((tmp & mask) != (wdt->mr & mask)) {
|
|
if (tmp == WDT_MR_RESET) {
|
|
wdt_write(wdt, AT91_WDT_MR, wdt->mr);
|
|
tmp = wdt_read(wdt, AT91_WDT_MR);
|
|
}
|
|
}
|
|
|
|
if (tmp & AT91_WDT_WDDIS) {
|
|
if (wdt->mr & AT91_WDT_WDDIS)
|
|
return 0;
|
|
dev_err(dev, "watchdog is disabled\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
value = tmp & AT91_WDT_WDV;
|
|
delta = (tmp & AT91_WDT_WDD) >> 16;
|
|
|
|
if (delta < value)
|
|
min_heartbeat = ticks_to_hz_roundup(value - delta);
|
|
|
|
max_heartbeat = ticks_to_hz_rounddown(value);
|
|
if (!max_heartbeat) {
|
|
dev_err(dev,
|
|
"heartbeat is too small for the system to handle it correctly\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Try to reset the watchdog counter 4 or 2 times more often than
|
|
* actually requested, to avoid spurious watchdog reset.
|
|
* If this is not possible because of the min_heartbeat value, reset
|
|
* it at the min_heartbeat period.
|
|
*/
|
|
if ((max_heartbeat / 4) >= min_heartbeat)
|
|
wdt->heartbeat = max_heartbeat / 4;
|
|
else if ((max_heartbeat / 2) >= min_heartbeat)
|
|
wdt->heartbeat = max_heartbeat / 2;
|
|
else
|
|
wdt->heartbeat = min_heartbeat;
|
|
|
|
if (max_heartbeat < min_heartbeat + 4)
|
|
dev_warn(dev,
|
|
"min heartbeat and max heartbeat might be too close for the system to handle it correctly\n");
|
|
|
|
if ((tmp & AT91_WDT_WDFIEN) && wdt->irq) {
|
|
err = request_irq(wdt->irq, wdt_interrupt,
|
|
IRQF_SHARED | IRQF_IRQPOLL,
|
|
pdev->name, wdt);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if ((tmp & wdt->mr_mask) != (wdt->mr & wdt->mr_mask))
|
|
dev_warn(dev,
|
|
"watchdog already configured differently (mr = %x expecting %x)\n",
|
|
tmp & wdt->mr_mask, wdt->mr & wdt->mr_mask);
|
|
|
|
setup_timer(&wdt->timer, at91_ping, (unsigned long)wdt);
|
|
|
|
/*
|
|
* Use min_heartbeat the first time to avoid spurious watchdog reset:
|
|
* we don't know for how long the watchdog counter is running, and
|
|
* - resetting it right now might trigger a watchdog fault reset
|
|
* - waiting for heartbeat time might lead to a watchdog timeout
|
|
* reset
|
|
*/
|
|
mod_timer(&wdt->timer, jiffies + min_heartbeat);
|
|
|
|
/* Try to set timeout from device tree first */
|
|
if (watchdog_init_timeout(&wdt->wdd, 0, dev))
|
|
watchdog_init_timeout(&wdt->wdd, heartbeat, dev);
|
|
watchdog_set_nowayout(&wdt->wdd, wdt->nowayout);
|
|
err = watchdog_register_device(&wdt->wdd);
|
|
if (err)
|
|
goto out_stop_timer;
|
|
|
|
wdt->next_heartbeat = jiffies + wdt->wdd.timeout * HZ;
|
|
|
|
return 0;
|
|
|
|
out_stop_timer:
|
|
del_timer(&wdt->timer);
|
|
return err;
|
|
}
|
|
|
|
/* ......................................................................... */
|
|
|
|
static const struct watchdog_info at91_wdt_info = {
|
|
.identity = DRV_NAME,
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static const struct watchdog_ops at91_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = at91_wdt_start,
|
|
.stop = at91_wdt_stop,
|
|
.set_timeout = at91_wdt_set_timeout,
|
|
};
|
|
|
|
#if defined(CONFIG_OF)
|
|
static int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)
|
|
{
|
|
u32 min = 0;
|
|
u32 max = WDT_COUNTER_MAX_SECS;
|
|
const char *tmp;
|
|
|
|
/* Get the interrupts property */
|
|
wdt->irq = irq_of_parse_and_map(np, 0);
|
|
if (!wdt->irq)
|
|
dev_warn(wdt->wdd.parent, "failed to get IRQ from DT\n");
|
|
|
|
if (!of_property_read_u32_index(np, "atmel,max-heartbeat-sec", 0,
|
|
&max)) {
|
|
if (!max || max > WDT_COUNTER_MAX_SECS)
|
|
max = WDT_COUNTER_MAX_SECS;
|
|
|
|
if (!of_property_read_u32_index(np, "atmel,min-heartbeat-sec",
|
|
0, &min)) {
|
|
if (min >= max)
|
|
min = max - 1;
|
|
}
|
|
}
|
|
|
|
min = secs_to_ticks(min);
|
|
max = secs_to_ticks(max);
|
|
|
|
wdt->mr_mask = 0x3FFFFFFF;
|
|
wdt->mr = 0;
|
|
if (!of_property_read_string(np, "atmel,watchdog-type", &tmp) &&
|
|
!strcmp(tmp, "software")) {
|
|
wdt->mr |= AT91_WDT_WDFIEN;
|
|
wdt->mr_mask &= ~AT91_WDT_WDRPROC;
|
|
} else {
|
|
wdt->mr |= AT91_WDT_WDRSTEN;
|
|
}
|
|
|
|
if (!of_property_read_string(np, "atmel,reset-type", &tmp) &&
|
|
!strcmp(tmp, "proc"))
|
|
wdt->mr |= AT91_WDT_WDRPROC;
|
|
|
|
if (of_property_read_bool(np, "atmel,disable")) {
|
|
wdt->mr |= AT91_WDT_WDDIS;
|
|
wdt->mr_mask &= AT91_WDT_WDDIS;
|
|
}
|
|
|
|
if (of_property_read_bool(np, "atmel,idle-halt"))
|
|
wdt->mr |= AT91_WDT_WDIDLEHLT;
|
|
|
|
if (of_property_read_bool(np, "atmel,dbg-halt"))
|
|
wdt->mr |= AT91_WDT_WDDBGHLT;
|
|
|
|
wdt->mr |= max | ((max - min) << 16);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int __init at91wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *r;
|
|
int err;
|
|
struct at91wdt *wdt;
|
|
|
|
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
wdt->mr = (WDT_HW_TIMEOUT * 256) | AT91_WDT_WDRSTEN | AT91_WDT_WDD |
|
|
AT91_WDT_WDDBGHLT | AT91_WDT_WDIDLEHLT;
|
|
wdt->mr_mask = 0x3FFFFFFF;
|
|
wdt->nowayout = nowayout;
|
|
wdt->wdd.parent = &pdev->dev;
|
|
wdt->wdd.info = &at91_wdt_info;
|
|
wdt->wdd.ops = &at91_wdt_ops;
|
|
wdt->wdd.timeout = WDT_HEARTBEAT;
|
|
wdt->wdd.min_timeout = 1;
|
|
wdt->wdd.max_timeout = 0xFFFF;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
wdt->base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(wdt->base))
|
|
return PTR_ERR(wdt->base);
|
|
|
|
if (pdev->dev.of_node) {
|
|
err = of_at91wdt_init(pdev->dev.of_node, wdt);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
err = at91_wdt_init(pdev, wdt);
|
|
if (err)
|
|
return err;
|
|
|
|
platform_set_drvdata(pdev, wdt);
|
|
|
|
pr_info("enabled (heartbeat=%d sec, nowayout=%d)\n",
|
|
wdt->wdd.timeout, wdt->nowayout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __exit at91wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct at91wdt *wdt = platform_get_drvdata(pdev);
|
|
watchdog_unregister_device(&wdt->wdd);
|
|
|
|
pr_warn("I quit now, hardware will probably reboot!\n");
|
|
del_timer(&wdt->timer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_OF)
|
|
static const struct of_device_id at91_wdt_dt_ids[] = {
|
|
{ .compatible = "atmel,at91sam9260-wdt" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, at91_wdt_dt_ids);
|
|
#endif
|
|
|
|
static struct platform_driver at91wdt_driver = {
|
|
.remove = __exit_p(at91wdt_remove),
|
|
.driver = {
|
|
.name = "at91_wdt",
|
|
.of_match_table = of_match_ptr(at91_wdt_dt_ids),
|
|
},
|
|
};
|
|
|
|
module_platform_driver_probe(at91wdt_driver, at91wdt_probe);
|
|
|
|
MODULE_AUTHOR("Renaud CERRATO <r.cerrato@til-technologies.fr>");
|
|
MODULE_DESCRIPTION("Watchdog driver for Atmel AT91SAM9x processors");
|
|
MODULE_LICENSE("GPL");
|