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/*
* 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;
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);
wdt->heartbeat = ticks_to_hz_rounddown(value);
if (!wdt->heartbeat) {
dev_err(dev,
"heartbeat is too small for the system to handle it correctly\n");
return -EINVAL;
}
if (wdt->heartbeat < min_heartbeat + 4) {
wdt->heartbeat = min_heartbeat;
dev_warn(dev,
"min heartbeat and max heartbeat might be too close for the system to handle it correctly\n");
if (wdt->heartbeat < 4)
dev_warn(dev,
"heartbeat might be too small for the system to handle it correctly\n");
} else {
wdt->heartbeat -= 4;
}
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);
mod_timer(&wdt->timer, jiffies + wdt->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;
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