linux/drivers/watchdog/orion_wdt.c
Linus Torvalds 750f77064a Merge git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck:
 - Removal of the Documentation/watchdog/00-INDEX file
 - Fix boot status reporting for imx2_wdt
 - clean-up sp805_wdt, pnx4008_wdt and mpcore_wdt
 - convert printk in watchdog drivers to pr_ functions
 - change nowayout module parameter to bool for every watchdog device
 - conversion of jz4740_wdt, pnx4008_wdt, max63xx_wdt, softdog,
   ep93xx_wdt, coh901327 and txx9wdt to new watchdog API
 - Add support for the WDIOC_GETTIMELEFT ioctl call to the new watchdog
   API
 - Change the new watchdog API so that the driver updates the timeout
   value
 - two fixes for the xen_wdt driver

Fix up conflicts in ep93xx driver due to the same patches being merged
through separate branches.

* git://www.linux-watchdog.org/linux-watchdog: (33 commits)
  watchdog: txx9wdt: fix timeout
  watchdog: Convert txx9wdt driver to watchdog framework
  watchdog: coh901327_wdt.c: fix timeout
  watchdog: coh901327: convert to use watchdog core
  watchdog: Add support for WDIOC_GETTIMELEFT IOCTL in watchdog core
  watchdog: ep93xx_wdt: timeout is an unsigned int value.
  watchdog: ep93xx_wdt: Fix timeout after conversion to watchdog core
  watchdog: Convert ep93xx driver to watchdog core
  watchdog: sp805: Use devm routines
  watchdog: sp805: replace readl/writel with lighter _relaxed variants
  watchdog: sp805: Fix documentation style comment
  watchdog: mpcore_wdt: Allow platform_get_irq() to fail
  watchdog: mpcore_wdt: Use devm routines
  watchdog: mpcore_wdt: Rename dev to pdev for pointing to struct platform_device
  watchdog: xen: don't clear is_active when xen_wdt_stop() failed
  watchdog: xen: don't unconditionally enable the watchdog during resume
  watchdog: fix compiler error for missing parenthesis
  watchdog: ep93xx_wdt.c: fix platform probe
  watchdog: ep93xx: Convert the watchdog driver into a platform device.
  watchdog: fix set_timeout operations
  ...
2012-03-28 13:03:26 -07:00

318 lines
6.8 KiB
C

/*
* drivers/watchdog/orion_wdt.c
*
* Watchdog driver for Orion/Kirkwood processors
*
* Author: Sylver Bruneau <sylver.bruneau@googlemail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <mach/bridge-regs.h>
#include <plat/orion_wdt.h>
/*
* Watchdog timer block registers.
*/
#define TIMER_CTRL 0x0000
#define WDT_EN 0x0010
#define WDT_VAL 0x0024
#define WDT_MAX_CYCLE_COUNT 0xffffffff
#define WDT_IN_USE 0
#define WDT_OK_TO_CLOSE 1
static bool nowayout = WATCHDOG_NOWAYOUT;
static int heartbeat = -1; /* module parameter (seconds) */
static unsigned int wdt_max_duration; /* (seconds) */
static unsigned int wdt_tclk;
static void __iomem *wdt_reg;
static unsigned long wdt_status;
static DEFINE_SPINLOCK(wdt_lock);
static void orion_wdt_ping(void)
{
spin_lock(&wdt_lock);
/* Reload watchdog duration */
writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
spin_unlock(&wdt_lock);
}
static void orion_wdt_enable(void)
{
u32 reg;
spin_lock(&wdt_lock);
/* Set watchdog duration */
writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
/* Clear watchdog timer interrupt */
reg = readl(BRIDGE_CAUSE);
reg &= ~WDT_INT_REQ;
writel(reg, BRIDGE_CAUSE);
/* Enable watchdog timer */
reg = readl(wdt_reg + TIMER_CTRL);
reg |= WDT_EN;
writel(reg, wdt_reg + TIMER_CTRL);
/* Enable reset on watchdog */
reg = readl(RSTOUTn_MASK);
reg |= WDT_RESET_OUT_EN;
writel(reg, RSTOUTn_MASK);
spin_unlock(&wdt_lock);
}
static void orion_wdt_disable(void)
{
u32 reg;
spin_lock(&wdt_lock);
/* Disable reset on watchdog */
reg = readl(RSTOUTn_MASK);
reg &= ~WDT_RESET_OUT_EN;
writel(reg, RSTOUTn_MASK);
/* Disable watchdog timer */
reg = readl(wdt_reg + TIMER_CTRL);
reg &= ~WDT_EN;
writel(reg, wdt_reg + TIMER_CTRL);
spin_unlock(&wdt_lock);
}
static int orion_wdt_get_timeleft(int *time_left)
{
spin_lock(&wdt_lock);
*time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk;
spin_unlock(&wdt_lock);
return 0;
}
static int orion_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
return -EBUSY;
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
orion_wdt_enable();
return nonseekable_open(inode, file);
}
static ssize_t orion_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
if (len) {
if (!nowayout) {
size_t i;
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
}
}
orion_wdt_ping();
}
return len;
}
static int orion_wdt_settimeout(int new_time)
{
if ((new_time <= 0) || (new_time > wdt_max_duration))
return -EINVAL;
/* Set new watchdog time to be used when
* orion_wdt_enable() or orion_wdt_ping() is called. */
heartbeat = new_time;
return 0;
}
static const struct watchdog_info ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING,
.identity = "Orion Watchdog",
};
static long orion_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret = -ENOTTY;
int time;
switch (cmd) {
case WDIOC_GETSUPPORT:
ret = copy_to_user((struct watchdog_info *)arg, &ident,
sizeof(ident)) ? -EFAULT : 0;
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
ret = put_user(0, (int *)arg);
break;
case WDIOC_KEEPALIVE:
orion_wdt_ping();
ret = 0;
break;
case WDIOC_SETTIMEOUT:
ret = get_user(time, (int *)arg);
if (ret)
break;
if (orion_wdt_settimeout(time)) {
ret = -EINVAL;
break;
}
orion_wdt_ping();
/* Fall through */
case WDIOC_GETTIMEOUT:
ret = put_user(heartbeat, (int *)arg);
break;
case WDIOC_GETTIMELEFT:
if (orion_wdt_get_timeleft(&time)) {
ret = -EINVAL;
break;
}
ret = put_user(time, (int *)arg);
break;
}
return ret;
}
static int orion_wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
orion_wdt_disable();
else
pr_crit("Device closed unexpectedly - timer will not stop\n");
clear_bit(WDT_IN_USE, &wdt_status);
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
return 0;
}
static const struct file_operations orion_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = orion_wdt_write,
.unlocked_ioctl = orion_wdt_ioctl,
.open = orion_wdt_open,
.release = orion_wdt_release,
};
static struct miscdevice orion_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &orion_wdt_fops,
};
static int __devinit orion_wdt_probe(struct platform_device *pdev)
{
struct orion_wdt_platform_data *pdata = pdev->dev.platform_data;
struct resource *res;
int ret;
if (pdata) {
wdt_tclk = pdata->tclk;
} else {
pr_err("misses platform data\n");
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt_reg = ioremap(res->start, resource_size(res));
if (orion_wdt_miscdev.parent)
return -EBUSY;
orion_wdt_miscdev.parent = &pdev->dev;
wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk;
if (orion_wdt_settimeout(heartbeat))
heartbeat = wdt_max_duration;
ret = misc_register(&orion_wdt_miscdev);
if (ret)
return ret;
pr_info("Initial timeout %d sec%s\n",
heartbeat, nowayout ? ", nowayout" : "");
return 0;
}
static int __devexit orion_wdt_remove(struct platform_device *pdev)
{
int ret;
if (test_bit(WDT_IN_USE, &wdt_status)) {
orion_wdt_disable();
clear_bit(WDT_IN_USE, &wdt_status);
}
ret = misc_deregister(&orion_wdt_miscdev);
if (!ret)
orion_wdt_miscdev.parent = NULL;
return ret;
}
static void orion_wdt_shutdown(struct platform_device *pdev)
{
if (test_bit(WDT_IN_USE, &wdt_status))
orion_wdt_disable();
}
static struct platform_driver orion_wdt_driver = {
.probe = orion_wdt_probe,
.remove = __devexit_p(orion_wdt_remove),
.shutdown = orion_wdt_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "orion_wdt",
},
};
module_platform_driver(orion_wdt_driver);
MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
MODULE_DESCRIPTION("Orion Processor Watchdog");
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);