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watchdog: omap_wdt: convert to new watchdog core 

Convert omap_wdt to new watchdog core. On OMAP boards, there are usually
multiple watchdogs. Since the new watchdog core supports multiple
watchdogs, all watchdog drivers used on OMAP should be converted.

The legacy watchdog device node is still created, so this should not
break existing users.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Tested-by: Jarkko Nikula <jarkko.nikula@jollamobile.com>
Tested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Aaro Koskinen 2012-10-10 23:23:32 +03:00 committed by Wim Van Sebroeck
parent cf13a84d17
commit 67c0f55468
2 changed files with 116 additions and 153 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/watchdog/Kconfig
View File

@ -232,6 +232,7 @@ config EP93XX_WATCHDOG
config OMAP_WATCHDOG
tristate "OMAP Watchdog"
depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
select WATCHDOG_CORE
help
Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog. Say 'Y'
here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog timer.

268
drivers/watchdog/omap_wdt.c
View File

@ -31,42 +31,34 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/moduleparam.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/omap-wd-timer.h>
#include "omap_wdt.h"
static struct platform_device *omap_wdt_dev;
static unsigned timer_margin;
module_param(timer_margin, uint, 0);
MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
static unsigned int wdt_trgr_pattern = 0x1234;
static DEFINE_SPINLOCK(wdt_lock);
struct omap_wdt_dev {
void __iomem *base; /* physical */
struct device *dev;
int omap_wdt_users;
bool omap_wdt_users;
struct resource *mem;
struct miscdevice omap_wdt_miscdev;
int wdt_trgr_pattern;
struct mutex lock; /* to avoid races with PM */
};
static void omap_wdt_ping(struct omap_wdt_dev *wdev)
static void omap_wdt_reload(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
@ -74,8 +66,8 @@ static void omap_wdt_ping(struct omap_wdt_dev *wdev)
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
wdt_trgr_pattern = ~wdt_trgr_pattern;
__raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
wdev->wdt_trgr_pattern = ~wdev->wdt_trgr_pattern;
__raw_writel(wdev->wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
/* wait for posted write to complete */
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
@ -111,18 +103,10 @@ static void omap_wdt_disable(struct omap_wdt_dev *wdev)
cpu_relax();
}
static void omap_wdt_adjust_timeout(unsigned new_timeout)
static void omap_wdt_set_timer(struct omap_wdt_dev *wdev,
unsigned int timeout)
{
if (new_timeout < TIMER_MARGIN_MIN)
new_timeout = TIMER_MARGIN_DEFAULT;
if (new_timeout > TIMER_MARGIN_MAX)
new_timeout = TIMER_MARGIN_MAX;
timer_margin = new_timeout;
}
static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
{
u32 pre_margin = GET_WLDR_VAL(timer_margin);
u32 pre_margin = GET_WLDR_VAL(timeout);
void __iomem *base = wdev->base;
/* just count up at 32 KHz */
@ -134,16 +118,14 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
cpu_relax();
}
/*
* Allow only one task to hold it open
*/
static int omap_wdt_open(struct inode *inode, struct file *file)
static int omap_wdt_start(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
void __iomem *base = wdev->base;
if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
return -EBUSY;
mutex_lock(&wdev->lock);
wdev->omap_wdt_users = true;
pm_runtime_get_sync(wdev->dev);
@ -155,117 +137,81 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
file->private_data = (void *) wdev;
omap_wdt_set_timeout(wdev);
omap_wdt_ping(wdev); /* trigger loading of new timeout value */
omap_wdt_set_timer(wdev, wdog->timeout);
omap_wdt_reload(wdev); /* trigger loading of new timeout value */
omap_wdt_enable(wdev);
return nonseekable_open(inode, file);
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = file->private_data;
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
#else
pr_crit("Unexpected close, not stopping!\n");
#endif
wdev->omap_wdt_users = 0;
mutex_unlock(&wdev->lock);
return 0;
}
static ssize_t omap_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
static int omap_wdt_stop(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = file->private_data;
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
/* Refresh LOAD_TIME. */
if (len) {
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
}
return len;
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
wdev->omap_wdt_users = false;
mutex_unlock(&wdev->lock);
return 0;
}
static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
static int omap_wdt_ping(struct watchdog_device *wdog)
{
struct omap_wd_timer_platform_data *pdata;
struct omap_wdt_dev *wdev;
u32 rs;
int new_margin, bs;
static const struct watchdog_info ident = {
.identity = "OMAP Watchdog",
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
wdev = file->private_data;
pdata = wdev->dev->platform_data;
mutex_lock(&wdev->lock);
omap_wdt_reload(wdev);
mutex_unlock(&wdev->lock);
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info __user *)arg, &ident,
sizeof(ident));
case WDIOC_GETSTATUS:
return put_user(0, (int __user *)arg);
case WDIOC_GETBOOTSTATUS:
if (!pdata || !pdata->read_reset_sources)
return put_user(0, (int __user *)arg);
rs = pdata->read_reset_sources();
bs = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
WDIOF_CARDRESET : 0;
return put_user(bs, (int __user *)arg);
case WDIOC_KEEPALIVE:
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
spin_lock(&wdt_lock);
omap_wdt_disable(wdev);
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timer_margin, (int __user *)arg);
default:
return -ENOTTY;
}
return 0;
}
static const struct file_operations omap_wdt_fops = {
.owner = THIS_MODULE,
.write = omap_wdt_write,
.unlocked_ioctl = omap_wdt_ioctl,
.open = omap_wdt_open,
.release = omap_wdt_release,
.llseek = no_llseek,
static int omap_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int timeout)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
omap_wdt_set_timer(wdev, timeout);
omap_wdt_enable(wdev);
omap_wdt_reload(wdev);
wdog->timeout = timeout;
mutex_unlock(&wdev->lock);
return 0;
}
static const struct watchdog_info omap_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "OMAP Watchdog",
};
static const struct watchdog_ops omap_wdt_ops = {
.owner = THIS_MODULE,
.start = omap_wdt_start,
.stop = omap_wdt_stop,
.ping = omap_wdt_ping,
.set_timeout = omap_wdt_set_timeout,
};
static int omap_wdt_probe(struct platform_device *pdev)
{
struct omap_wd_timer_platform_data *pdata = pdev->dev.platform_data;
bool nowayout = WATCHDOG_NOWAYOUT;
struct watchdog_device *omap_wdt;
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
u32 rs;
int ret;
omap_wdt = kzalloc(sizeof(*omap_wdt), GFP_KERNEL);
if (!omap_wdt)
return -ENOMEM;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@ -273,11 +219,6 @@ static int omap_wdt_probe(struct platform_device *pdev)
goto err_get_resource;
}
if (omap_wdt_dev) {
ret = -EBUSY;
goto err_busy;
}
mem = request_mem_region(res->start, resource_size(res), pdev->name);
if (!mem) {
ret = -EBUSY;
@ -290,9 +231,11 @@ static int omap_wdt_probe(struct platform_device *pdev)
goto err_kzalloc;
}
wdev->omap_wdt_users = 0;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->omap_wdt_users = false;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
wdev->base = ioremap(res->start, resource_size(res));
if (!wdev->base) {
@ -300,34 +243,47 @@ static int omap_wdt_probe(struct platform_device *pdev)
goto err_ioremap;
}
platform_set_drvdata(pdev, wdev);
omap_wdt->info = &omap_wdt_info;
omap_wdt->ops = &omap_wdt_ops;
omap_wdt->min_timeout = TIMER_MARGIN_MIN;
omap_wdt->max_timeout = TIMER_MARGIN_MAX;
if (timer_margin >= TIMER_MARGIN_MIN &&
timer_margin <= TIMER_MARGIN_MAX)
omap_wdt->timeout = timer_margin;
else
omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
watchdog_set_drvdata(omap_wdt, wdev);
watchdog_set_nowayout(omap_wdt, nowayout);
platform_set_drvdata(pdev, omap_wdt);
pm_runtime_enable(wdev->dev);
pm_runtime_get_sync(wdev->dev);
if (pdata && pdata->read_reset_sources)
rs = pdata->read_reset_sources();
else
rs = 0;
omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
WDIOF_CARDRESET : 0;
omap_wdt_disable(wdev);
omap_wdt_adjust_timeout(timer_margin);
wdev->omap_wdt_miscdev.parent = &pdev->dev;
wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
wdev->omap_wdt_miscdev.name = "watchdog";
wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
ret = misc_register(&(wdev->omap_wdt_miscdev));
ret = watchdog_register_device(omap_wdt);
if (ret)
goto err_misc;
goto err_register;
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
timer_margin);
omap_wdt->timeout);
pm_runtime_put_sync(wdev->dev);
omap_wdt_dev = pdev;
return 0;
err_misc:
err_register:
pm_runtime_disable(wdev->dev);
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
@ -341,37 +297,38 @@ err_kzalloc:
err_busy:
err_get_resource:
kfree(omap_wdt);
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
mutex_unlock(&wdev->lock);
}
static int omap_wdt_remove(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pm_runtime_disable(wdev->dev);
if (!res)
return -ENOENT;
misc_deregister(&(wdev->omap_wdt_miscdev));
watchdog_unregister_device(wdog);
release_mem_region(res->start, resource_size(res));
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
kfree(wdev);
omap_wdt_dev = NULL;
kfree(wdog);
return 0;
}
@ -386,25 +343,31 @@ static int omap_wdt_remove(struct platform_device *pdev)
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
pm_runtime_get_sync(wdev->dev);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
omap_wdt_reload(wdev);
}
mutex_unlock(&wdev->lock);
return 0;
}
@ -437,5 +400,4 @@ module_platform_driver(omap_wdt_driver);
MODULE_AUTHOR("George G. Davis");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:omap_wdt");