Commit 52e5cc4e authored by Guenter Roeck's avatar Guenter Roeck Committed by Wim Van Sebroeck

watchdog: Convert BookE watchdog driver to watchdog infrastructure

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 04ecc7dc
......@@ -1145,6 +1145,7 @@ config PIKA_WDT
config BOOKE_WDT
tristate "PowerPC Book-E Watchdog Timer"
depends on BOOKE || 4xx
select WATCHDOG_CORE
---help---
Watchdog driver for PowerPC Book-E chips, such as the Freescale
MPC85xx SOCs and the IBM PowerPC 440.
......
......@@ -15,12 +15,8 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/miscdevice.h>
#include <linux/notifier.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <asm/reg_booke.h>
#include <asm/time.h>
......@@ -45,7 +41,7 @@ u32 booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT;
#define WDTP_MASK (TCR_WP_MASK)
#endif
static DEFINE_SPINLOCK(booke_wdt_lock);
#ifdef CONFIG_PPC_FSL_BOOK3E
/* For the specified period, determine the number of seconds
* corresponding to the reset time. There will be a watchdog
......@@ -86,6 +82,24 @@ static unsigned int sec_to_period(unsigned int secs)
return 0;
}
#define MAX_WDT_TIMEOUT period_to_sec(1)
#else /* CONFIG_PPC_FSL_BOOK3E */
static unsigned long long period_to_sec(unsigned int period)
{
return period;
}
static unsigned int sec_to_period(unsigned int secs)
{
return secs;
}
#define MAX_WDT_TIMEOUT 3 /* from Kconfig */
#endif /* !CONFIG_PPC_FSL_BOOK3E */
static void __booke_wdt_set(void *data)
{
u32 val;
......@@ -107,9 +121,11 @@ static void __booke_wdt_ping(void *data)
mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
}
static void booke_wdt_ping(void)
static int booke_wdt_ping(struct watchdog_device *wdog)
{
on_each_cpu(__booke_wdt_ping, NULL, 0);
return 0;
}
static void __booke_wdt_enable(void *data)
......@@ -146,152 +162,81 @@ static void __booke_wdt_disable(void *data)
}
static ssize_t booke_wdt_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
static void __booke_wdt_start(struct watchdog_device *wdog)
{
booke_wdt_ping();
return count;
on_each_cpu(__booke_wdt_enable, NULL, 0);
pr_debug("watchdog enabled (timeout = %u sec)\n", wdog->timeout);
}
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "PowerPC Book-E Watchdog",
};
static long booke_wdt_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
static int booke_wdt_start(struct watchdog_device *wdog)
{
u32 tmp = 0;
u32 __user *p = (u32 __user *)arg;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(p, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
return put_user(0, p);
case WDIOC_GETBOOTSTATUS:
/* XXX: something is clearing TSR */
tmp = mfspr(SPRN_TSR) & TSR_WRS(3);
/* returns CARDRESET if last reset was caused by the WDT */
return put_user((tmp ? WDIOF_CARDRESET : 0), p);
case WDIOC_SETOPTIONS:
if (get_user(tmp, p))
return -EFAULT;
if (tmp == WDIOS_ENABLECARD) {
booke_wdt_ping();
break;
} else
return -EINVAL;
return 0;
case WDIOC_KEEPALIVE:
booke_wdt_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(tmp, p))
return -EFAULT;
#ifdef CONFIG_PPC_FSL_BOOK3E
/* period of 1 gives the largest possible timeout */
if (tmp > period_to_sec(1))
return -EINVAL;
booke_wdt_period = sec_to_period(tmp);
#else
booke_wdt_period = tmp;
#endif
booke_wdt_set();
/* Fall */
case WDIOC_GETTIMEOUT:
#ifdef CONFIG_FSL_BOOKE
return put_user(period_to_sec(booke_wdt_period), p);
#else
return put_user(booke_wdt_period, p);
#endif
default:
return -ENOTTY;
}
return 0;
}
/* wdt_is_active stores whether or not the /dev/watchdog device is opened */
static unsigned long wdt_is_active;
static int booke_wdt_open(struct inode *inode, struct file *file)
{
/* /dev/watchdog can only be opened once */
if (test_and_set_bit(0, &wdt_is_active))
return -EBUSY;
spin_lock(&booke_wdt_lock);
if (booke_wdt_enabled == 0) {
booke_wdt_enabled = 1;
on_each_cpu(__booke_wdt_enable, NULL, 0);
pr_debug("watchdog enabled (timeout = %llu sec)\n",
period_to_sec(booke_wdt_period));
__booke_wdt_start(wdog);
}
spin_unlock(&booke_wdt_lock);
return nonseekable_open(inode, file);
return 0;
}
static int booke_wdt_release(struct inode *inode, struct file *file)
static int booke_wdt_stop(struct watchdog_device *wdog)
{
#ifndef CONFIG_WATCHDOG_NOWAYOUT
/* Normally, the watchdog is disabled when /dev/watchdog is closed, but
* if CONFIG_WATCHDOG_NOWAYOUT is defined, then it means that the
* watchdog should remain enabled. So we disable it only if
* CONFIG_WATCHDOG_NOWAYOUT is not defined.
*/
on_each_cpu(__booke_wdt_disable, NULL, 0);
booke_wdt_enabled = 0;
pr_debug("watchdog disabled\n");
#endif
clear_bit(0, &wdt_is_active);
return 0;
}
static int booke_wdt_set_timeout(struct watchdog_device *wdt_dev,
unsigned int timeout)
{
if (timeout > MAX_WDT_TIMEOUT)
return -EINVAL;
booke_wdt_period = sec_to_period(timeout);
wdt_dev->timeout = timeout;
booke_wdt_set();
return 0;
}
static const struct file_operations booke_wdt_fops = {
static struct watchdog_info booke_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "PowerPC Book-E Watchdog",
};
static struct watchdog_ops booke_wdt_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = booke_wdt_write,
.unlocked_ioctl = booke_wdt_ioctl,
.open = booke_wdt_open,
.release = booke_wdt_release,
.start = booke_wdt_start,
.stop = booke_wdt_stop,
.ping = booke_wdt_ping,
.set_timeout = booke_wdt_set_timeout,
};
static struct miscdevice booke_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &booke_wdt_fops,
static struct watchdog_device booke_wdt_dev = {
.info = &booke_wdt_info,
.ops = &booke_wdt_ops,
.min_timeout = 1,
.max_timeout = 0xFFFF
};
static void __exit booke_wdt_exit(void)
{
misc_deregister(&booke_wdt_miscdev);
watchdog_unregister_device(&booke_wdt_dev);
}
static int __init booke_wdt_init(void)
{
int ret = 0;
bool nowayout = WATCHDOG_NOWAYOUT;
pr_info("powerpc book-e watchdog driver loaded\n");
ident.firmware_version = cur_cpu_spec->pvr_value;
ret = misc_register(&booke_wdt_miscdev);
if (ret) {
pr_err("cannot register device (minor=%u, ret=%i)\n",
WATCHDOG_MINOR, ret);
return ret;
}
spin_lock(&booke_wdt_lock);
if (booke_wdt_enabled == 1) {
pr_info("watchdog enabled (timeout = %llu sec)\n",
period_to_sec(booke_wdt_period));
on_each_cpu(__booke_wdt_enable, NULL, 0);
}
spin_unlock(&booke_wdt_lock);
booke_wdt_info.firmware_version = cur_cpu_spec->pvr_value;
booke_wdt_set_timeout(&booke_wdt_dev,
period_to_sec(CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT));
watchdog_set_nowayout(&booke_wdt_dev, nowayout);
if (booke_wdt_enabled)
__booke_wdt_start(&booke_wdt_dev);
ret = watchdog_register_device(&booke_wdt_dev);
return ret;
}
......
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