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Merge git://www.linux-watchdog.org/linux-watchdog

Browse source 
Pull watchdog updates from Wim Van Sebroeck:
 "This includes some fixes and code improvements (like
  clk_prepare_enable and clk_disable_unprepare), conversion from the
  omap_wdt and twl4030_wdt drivers to the watchdog framework, addition
  of the SB8x0 chipset support and the DA9055 Watchdog driver and some
  OF support for the davinci_wdt driver."

* git://www.linux-watchdog.org/linux-watchdog: (22 commits)
  watchdog: mei: avoid oops in watchdog unregister code path
  watchdog: Orion: Fix possible null-deference in orion_wdt_probe
  watchdog: sp5100_tco: Add SB8x0 chipset support
  watchdog: davinci_wdt: add OF support
  watchdog: da9052: Fix invalid free of devm_ allocated data
  watchdog: twl4030_wdt: Change TWL4030_MODULE_PM_RECEIVER to TWL_MODULE_PM_RECEIVER
  watchdog: remove depends on CONFIG_EXPERIMENTAL
  watchdog: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  watchdog: DA9055 Watchdog driver
  watchdog: omap_wdt: eliminate goto
  watchdog: omap_wdt: delete redundant platform_set_drvdata() calls
  watchdog: omap_wdt: convert to devm_ functions
  watchdog: omap_wdt: convert to new watchdog core
  watchdog: WatchDog Timer Driver Core: fix comment
  watchdog: s3c2410_wdt: use clk_prepare_enable and clk_disable_unprepare
  watchdog: imx2_wdt: Select the driver via ARCH_MXC
  watchdog: cpu5wdt.c: add missing del_timer call
  watchdog: hpwdt.c: Increase version string
  watchdog: Convert twl4030_wdt to watchdog core
  davinci_wdt: preparation for switch to common clock framework
  ...
This commit is contained in:
Linus Torvalds 2012-12-21 17:10:29 -08:00
commit 4fe19a136a
19 changed files with 742 additions and 449 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
Documentation/devicetree/bindings/watchdog/davinci-wdt.txt Normal file
View file

@ -0,0 +1,12 @@
DaVinci Watchdog Timer (WDT) Controller
Required properties:
- compatible : Should be "ti,davinci-wdt"
- reg : Should contain WDT registers location and length
Examples:
wdt: wdt@2320000 {
compatible = "ti,davinci-wdt";
reg = <0x02320000 0x80>;
};

2
drivers/misc/mei/wd.c
View file

@ -370,7 +370,7 @@ void mei_watchdog_register(struct mei_device *dev)
void mei_watchdog_unregister(struct mei_device *dev)
{
if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
return;
watchdog_set_drvdata(&amt_wd_dev, NULL);

18
drivers/watchdog/Kconfig
View file

@ -76,6 +76,16 @@ config DA9052_WATCHDOG
Alternatively say M to compile the driver as a module,
which will be called da9052_wdt.
config DA9055_WATCHDOG
tristate "Dialog Semiconductor DA9055 Watchdog"
depends on MFD_DA9055
help
If you say yes here you get support for watchdog on the Dialog
Semiconductor DA9055 PMIC.
This driver can also be built as a module. If so, the module
will be called da9055_wdt.
config WM831X_WATCHDOG
tristate "WM831x watchdog"
depends on MFD_WM831X
@ -232,6 +242,7 @@ 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.
@ -300,6 +311,7 @@ config COH901327_WATCHDOG
config TWL4030_WATCHDOG
tristate "TWL4030 Watchdog"
depends on TWL4030_CORE
select WATCHDOG_CORE
help
Support for TI TWL4030 watchdog. Say 'Y' here to enable the
watchdog timer support for TWL4030 chips.
@ -342,7 +354,7 @@ config MAX63XX_WATCHDOG
config IMX2_WDT
tristate "IMX2+ Watchdog"
depends on IMX_HAVE_PLATFORM_IMX2_WDT
depends on ARCH_MXC
help
This is the driver for the hardware watchdog
on the Freescale IMX2 and later processors.
@ -431,7 +443,7 @@ config ALIM7101_WDT
config F71808E_WDT
tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
depends on X86 && EXPERIMENTAL
depends on X86
help
This is the driver for the hardware watchdog on the Fintek
F71808E, F71862FG, F71869, F71882FG and F71889FG Super I/O controllers.
@ -622,7 +634,7 @@ config IT8712F_WDT
config IT87_WDT
tristate "IT87 Watchdog Timer"
depends on X86 && EXPERIMENTAL
depends on X86
---help---
This is the driver for the hardware watchdog on the ITE IT8702,
IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728

1
drivers/watchdog/Makefile
View file

@ -164,6 +164,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
# Architecture Independent
obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o

13
drivers/watchdog/ath79_wdt.c
View file

@ -284,6 +284,7 @@ static void ath97_wdt_shutdown(struct platform_device *pdev)
}
static struct platform_driver ath79_wdt_driver = {
.probe = ath79_wdt_probe,
.remove = ath79_wdt_remove,
.shutdown = ath97_wdt_shutdown,
.driver = {
@ -292,17 +293,7 @@ static struct platform_driver ath79_wdt_driver = {
},
};
static int __init ath79_wdt_init(void)
{
return platform_driver_probe(&ath79_wdt_driver, ath79_wdt_probe);
}
module_init(ath79_wdt_init);
static void __exit ath79_wdt_exit(void)
{
platform_driver_unregister(&ath79_wdt_driver);
}
module_exit(ath79_wdt_exit);
module_platform_driver(ath79_wdt_driver);
MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X hardware watchdog driver");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");

1
drivers/watchdog/cpu5wdt.c
View file

@ -266,6 +266,7 @@ static void cpu5wdt_exit(void)
if (cpu5wdt_device.queue) {
cpu5wdt_device.queue = 0;
wait_for_completion(&cpu5wdt_device.stop);
del_timer(&cpu5wdt_device.timer);
}
misc_deregister(&cpu5wdt_misc);

4
drivers/watchdog/da9052_wdt.c
View file

@ -53,10 +53,6 @@ static const struct {
static void da9052_wdt_release_resources(struct kref *r)
{
struct da9052_wdt_data *driver_data =
container_of(r, struct da9052_wdt_data, kref);
kfree(driver_data);
}
static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,

216
drivers/watchdog/da9055_wdt.c Normal file
View file

@ -0,0 +1,216 @@
/*
* System monitoring driver for DA9055 PMICs.
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/delay.h>
#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
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 DA9055_DEF_TIMEOUT 4
#define DA9055_TWDMIN 256
struct da9055_wdt_data {
struct watchdog_device wdt;
struct da9055 *da9055;
struct kref kref;
};
static const struct {
u8 reg_val;
int user_time; /* In seconds */
} da9055_wdt_maps[] = {
{ 0, 0 },
{ 1, 2 },
{ 2, 4 },
{ 3, 8 },
{ 4, 16 },
{ 5, 32 },
{ 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */
{ 6, 65 },
{ 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */
{ 7, 131 },
};
static int da9055_wdt_set_timeout(struct watchdog_device *wdt_dev,
unsigned int timeout)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
struct da9055 *da9055 = driver_data->da9055;
int ret, i;
for (i = 0; i < ARRAY_SIZE(da9055_wdt_maps); i++)
if (da9055_wdt_maps[i].user_time == timeout)
break;
if (i == ARRAY_SIZE(da9055_wdt_maps))
ret = -EINVAL;
else
ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
DA9055_TWDSCALE_MASK,
da9055_wdt_maps[i].reg_val <<
DA9055_TWDSCALE_SHIFT);
if (ret < 0)
dev_err(da9055->dev,
"Failed to update timescale bit, %d\n", ret);
wdt_dev->timeout = timeout;
return ret;
}
static int da9055_wdt_ping(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
struct da9055 *da9055 = driver_data->da9055;
int ret;
/*
* We have a minimum time for watchdog window called TWDMIN. A write
* to the watchdog before this elapsed time will cause an error.
*/
mdelay(DA9055_TWDMIN);
/* Reset the watchdog timer */
ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_E,
DA9055_WATCHDOG_MASK, 1);
return ret;
}
static void da9055_wdt_release_resources(struct kref *r)
{
struct da9055_wdt_data *driver_data =
container_of(r, struct da9055_wdt_data, kref);
kfree(driver_data);
}
static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_get(&driver_data->kref);
}
static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
}
static int da9055_wdt_start(struct watchdog_device *wdt_dev)
{
return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
}
static int da9055_wdt_stop(struct watchdog_device *wdt_dev)
{
return da9055_wdt_set_timeout(wdt_dev, 0);
}
static struct watchdog_info da9055_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "DA9055 Watchdog",
};
static const struct watchdog_ops da9055_wdt_ops = {
.owner = THIS_MODULE,
.start = da9055_wdt_start,
.stop = da9055_wdt_stop,
.ping = da9055_wdt_ping,
.set_timeout = da9055_wdt_set_timeout,
.ref = da9055_wdt_ref,
.unref = da9055_wdt_unref,
};
static int da9055_wdt_probe(struct platform_device *pdev)
{
struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
struct da9055_wdt_data *driver_data;
struct watchdog_device *da9055_wdt;
int ret;
driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
GFP_KERNEL);
if (!driver_data) {
dev_err(da9055->dev, "Failed to allocate watchdog device\n");
return -ENOMEM;
}
driver_data->da9055 = da9055;
da9055_wdt = &driver_data->wdt;
da9055_wdt->timeout = DA9055_DEF_TIMEOUT;
da9055_wdt->info = &da9055_wdt_info;
da9055_wdt->ops = &da9055_wdt_ops;
watchdog_set_nowayout(da9055_wdt, nowayout);
watchdog_set_drvdata(da9055_wdt, driver_data);
kref_init(&driver_data->kref);
ret = da9055_wdt_stop(da9055_wdt);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
goto err;
}
dev_set_drvdata(&pdev->dev, driver_data);
ret = watchdog_register_device(&driver_data->wdt);
if (ret != 0)
dev_err(da9055->dev, "watchdog_register_device() failed: %d\n",
ret);
err:
return ret;
}
static int da9055_wdt_remove(struct platform_device *pdev)
{
struct da9055_wdt_data *driver_data = dev_get_drvdata(&pdev->dev);
watchdog_unregister_device(&driver_data->wdt);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
return 0;
}
static struct platform_driver da9055_wdt_driver = {
.probe = da9055_wdt_probe,
.remove = da9055_wdt_remove,
.driver = {
.name = "da9055-watchdog",
},
};
module_platform_driver(da9055_wdt_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9055 watchdog");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-watchdog");

11
drivers/watchdog/davinci_wdt.c
View file

@ -208,7 +208,7 @@ static int davinci_wdt_probe(struct platform_device *pdev)
if (WARN_ON(IS_ERR(wdt_clk)))
return PTR_ERR(wdt_clk);
clk_enable(wdt_clk);
clk_prepare_enable(wdt_clk);
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
heartbeat = DEFAULT_HEARTBEAT;
@ -256,16 +256,23 @@ static int davinci_wdt_remove(struct platform_device *pdev)
wdt_mem = NULL;
}
clk_disable(wdt_clk);
clk_disable_unprepare(wdt_clk);
clk_put(wdt_clk);
return 0;
}
static const struct of_device_id davinci_wdt_of_match[] = {
{ .compatible = "ti,davinci-wdt", },
{},
};
MODULE_DEVICE_TABLE(of, davinci_wdt_of_match);
static struct platform_driver platform_wdt_driver = {
.driver = {
.name = "watchdog",
.owner = THIS_MODULE,
.of_match_table = davinci_wdt_of_match,
},
.probe = davinci_wdt_probe,
.remove = davinci_wdt_remove,

2
drivers/watchdog/hpwdt.c
View file

@ -39,7 +39,7 @@
#endif /* CONFIG_HPWDT_NMI_DECODING */
#include <asm/nmi.h>
#define HPWDT_VERSION "1.3.0"
#define HPWDT_VERSION "1.3.1"
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)

19
drivers/watchdog/mpcore_wdt.c
View file

@ -80,8 +80,7 @@ static irqreturn_t mpcore_wdt_fire(int irq, void *arg)
/* Check it really was our interrupt */
if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
dev_printk(KERN_CRIT, wdt->dev,
"Triggered - Reboot ignored.\n");
dev_crit(wdt->dev, "Triggered - Reboot ignored\n");
/* Clear the interrupt on the watchdog */
writel(1, wdt->base + TWD_WDOG_INTSTAT);
return IRQ_HANDLED;
@ -123,7 +122,7 @@ static void mpcore_wdt_stop(struct mpcore_wdt *wdt)
static void mpcore_wdt_start(struct mpcore_wdt *wdt)
{
dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
dev_info(wdt->dev, "enabling watchdog\n");
/* This loads the count register but does NOT start the count yet */
mpcore_wdt_keepalive(wdt);
@ -180,8 +179,8 @@ static int mpcore_wdt_release(struct inode *inode, struct file *file)
if (wdt->expect_close == 42)
mpcore_wdt_stop(wdt);
else {
dev_printk(KERN_CRIT, wdt->dev,
"unexpected close, not stopping watchdog!\n");
dev_crit(wdt->dev,
"unexpected close, not stopping watchdog!\n");
mpcore_wdt_keepalive(wdt);
}
clear_bit(0, &wdt->timer_alive);
@ -351,9 +350,9 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
ret = devm_request_irq(wdt->dev, wdt->irq, mpcore_wdt_fire, 0,
"mpcore_wdt", wdt);
if (ret) {
dev_printk(KERN_ERR, wdt->dev,
"cannot register IRQ%d for watchdog\n",
wdt->irq);
dev_err(wdt->dev,
"cannot register IRQ%d for watchdog\n",
wdt->irq);
return ret;
}
}
@ -365,9 +364,9 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
mpcore_wdt_miscdev.parent = &pdev->dev;
ret = misc_register(&mpcore_wdt_miscdev);
if (ret) {
dev_printk(KERN_ERR, wdt->dev,
dev_err(wdt->dev,
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
WATCHDOG_MINOR, ret);
return ret;
}

319
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);
@ -155,223 +137,169 @@ 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 = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
if (!omap_wdt)
return -ENOMEM;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENOENT;
goto err_get_resource;
}
if (!res)
return -ENOENT;
if (omap_wdt_dev) {
ret = -EBUSY;
goto err_busy;
}
mem = devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name);
if (!mem)
return -EBUSY;
mem = request_mem_region(res->start, resource_size(res), pdev->name);
if (!mem) {
ret = -EBUSY;
goto err_busy;
}
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
if (!wdev) {
ret = -ENOMEM;
goto err_kzalloc;
}
wdev->omap_wdt_users = false;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
wdev->omap_wdt_users = 0;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!wdev->base)
return -ENOMEM;
wdev->base = ioremap(res->start, resource_size(res));
if (!wdev->base) {
ret = -ENOMEM;
goto err_ioremap;
}
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;
platform_set_drvdata(pdev, wdev);
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));
if (ret)
goto err_misc;
ret = watchdog_register_device(omap_wdt);
if (ret) {
pm_runtime_disable(wdev->dev);
return ret;
}
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:
pm_runtime_disable(wdev->dev);
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
err_ioremap:
wdev->base = NULL;
kfree(wdev);
err_kzalloc:
release_mem_region(res->start, resource_size(res));
err_busy:
err_get_resource:
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));
release_mem_region(res->start, resource_size(res));
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
kfree(wdev);
omap_wdt_dev = NULL;
watchdog_unregister_device(wdog);
return 0;
}
@ -386,25 +314,31 @@ 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 +371,4 @@ module_platform_driver(omap_wdt_driver);
MODULE_AUTHOR("George G. Davis");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:omap_wdt");

2
drivers/watchdog/orion_wdt.c
View file

@ -156,6 +156,8 @@ static int orion_wdt_probe(struct platform_device *pdev)
wdt_tclk = clk_get_rate(clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!wdt_reg)
return -ENOMEM;

6
drivers/watchdog/s3c2410_wdt.c
View file

@ -354,7 +354,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
goto err_map;
}
clk_enable(wdt_clock);
clk_prepare_enable(wdt_clock);
ret = s3c2410wdt_cpufreq_register();
if (ret < 0) {
@ -421,7 +421,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
s3c2410wdt_cpufreq_deregister();
err_clk:
clk_disable(wdt_clock);
clk_disable_unprepare(wdt_clock);
clk_put(wdt_clock);
wdt_clock = NULL;
@ -445,7 +445,7 @@ static int s3c2410wdt_remove(struct platform_device *dev)
s3c2410wdt_cpufreq_deregister();
clk_disable(wdt_clock);
clk_disable_unprepare(wdt_clock);
clk_put(wdt_clock);
wdt_clock = NULL;

321
drivers/watchdog/sp5100_tco.c
View file

@ -13,7 +13,9 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
* AMD Publication 45482 "AMD SB800-Series Southbridges Register
* Reference Guide"
*/
/*
@ -38,18 +40,24 @@
#include "sp5100_tco.h"
/* Module and version information */
#define TCO_VERSION "0.01"
#define TCO_VERSION "0.03"
#define TCO_MODULE_NAME "SP5100 TCO timer"
#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
/* internal variables */
static u32 tcobase_phys;
static u32 resbase_phys;
static u32 tco_wdt_fired;
static void __iomem *tcobase;
static unsigned int pm_iobase;
static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
static unsigned long timer_alive;
static char tco_expect_close;
static struct pci_dev *sp5100_tco_pci;
static struct resource wdt_res = {
.name = "Watchdog Timer",
.flags = IORESOURCE_MEM,
};
/* the watchdog platform device */
static struct platform_device *sp5100_tco_platform_device;
@ -64,9 +72,15 @@ MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static unsigned int force_addr;
module_param(force_addr, uint, 0);
MODULE_PARM_DESC(force_addr, "Force the use of specified MMIO address."
" ONLY USE THIS PARAMETER IF YOU REALLY KNOW"
" WHAT YOU ARE DOING (default=none)");
/*
* Some TCO specific functions
*/
@ -122,6 +136,79 @@ static int tco_timer_set_heartbeat(int t)
return 0;
}
static void tco_timer_enable(void)
{
int val;
if (sp5100_tco_pci->revision >= 0x40) {
/* For SB800 or later */
/* Set the Watchdog timer resolution to 1 sec */
outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
val |= SB800_PM_WATCHDOG_SECOND_RES;
outb(val, SB800_IO_PM_DATA_REG);
/* Enable watchdog decode bit and watchdog timer */
outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
val |= SB800_PCI_WATCHDOG_DECODE_EN;
val &= ~SB800_PM_WATCHDOG_DISABLE;
outb(val, SB800_IO_PM_DATA_REG);
} else {
/* For SP5100 or SB7x0 */
/* Enable watchdog decode bit */
pci_read_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
&val);
val |= SP5100_PCI_WATCHDOG_DECODE_EN;
pci_write_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
val);
/* Enable Watchdog timer and set the resolution to 1 sec */
outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
val |= SP5100_PM_WATCHDOG_SECOND_RES;
val &= ~SP5100_PM_WATCHDOG_DISABLE;
outb(val, SP5100_IO_PM_DATA_REG);
}
}
static void tco_timer_disable(void)
{
int val;
if (sp5100_tco_pci->revision >= 0x40) {
/* For SB800 or later */
/* Enable watchdog decode bit and Disable watchdog timer */
outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
val |= SB800_PCI_WATCHDOG_DECODE_EN;
val |= SB800_PM_WATCHDOG_DISABLE;
outb(val, SB800_IO_PM_DATA_REG);
} else {
/* For SP5100 or SB7x0 */
/* Enable watchdog decode bit */
pci_read_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
&val);
val |= SP5100_PCI_WATCHDOG_DECODE_EN;
pci_write_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
val);
/* Disable Watchdog timer */
outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
val |= SP5100_PM_WATCHDOG_DISABLE;
outb(val, SP5100_IO_PM_DATA_REG);
}
}
/*
* /dev/watchdog handling
*/
@ -270,11 +357,12 @@ MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
/*
* Init & exit routines
*/
static unsigned char sp5100_tco_setupdevice(void)
{
struct pci_dev *dev = NULL;
const char *dev_name = NULL;
u32 val;
u32 index_reg, data_reg, base_addr;
/* Match the PCI device */
for_each_pci_dev(dev) {
@ -287,29 +375,160 @@ static unsigned char sp5100_tco_setupdevice(void)
if (!sp5100_tco_pci)
return 0;
pr_info("PCI Revision ID: 0x%x\n", sp5100_tco_pci->revision);
/*
* Determine type of southbridge chipset.
*/
if (sp5100_tco_pci->revision >= 0x40) {
dev_name = SB800_DEVNAME;
index_reg = SB800_IO_PM_INDEX_REG;
data_reg = SB800_IO_PM_DATA_REG;
base_addr = SB800_PM_WATCHDOG_BASE;
} else {
dev_name = SP5100_DEVNAME;
index_reg = SP5100_IO_PM_INDEX_REG;
data_reg = SP5100_IO_PM_DATA_REG;
base_addr = SP5100_PM_WATCHDOG_BASE;
}
/* Request the IO ports used by this driver */
pm_iobase = SP5100_IO_PM_INDEX_REG;
if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
pr_err("I/O address 0x%04x already in use\n", pm_iobase);
goto exit;
}
/* Find the watchdog base address. */
outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
/* Low three bits of BASE0 are reserved. */
val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
/*
* First, Find the watchdog timer MMIO address from indirect I/O.
*/
outb(base_addr+3, index_reg);
val = inb(data_reg);
outb(base_addr+2, index_reg);
val = val << 8 | inb(data_reg);
outb(base_addr+1, index_reg);
val = val << 8 | inb(data_reg);
outb(base_addr+0, index_reg);
/* Low three bits of BASE are reserved */
val = val << 8 | (inb(data_reg) & 0xf8);
pr_debug("Got 0x%04x from indirect I/O\n", val);
/* Check MMIO address conflict */
if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
dev_name))
goto setup_wdt;
else
pr_debug("MMIO address 0x%04x already in use\n", val);
/*
* Secondly, Find the watchdog timer MMIO address
* from SBResource_MMIO register.
*/
if (sp5100_tco_pci->revision >= 0x40) {
/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+1, SB800_IO_PM_INDEX_REG);
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
} else {
/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
pci_read_config_dword(sp5100_tco_pci,
SP5100_SB_RESOURCE_MMIO_BASE, &val);
}
/* The SBResource_MMIO is enabled and mapped memory space? */
if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) ==
SB800_ACPI_MMIO_DECODE_EN) {
/* Clear unnecessary the low twelve bits */
val &= ~0xFFF;
/* Add the Watchdog Timer offset to base address. */
val += SB800_PM_WDT_MMIO_OFFSET;
/* Check MMIO address conflict */
if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
dev_name)) {
pr_debug("Got 0x%04x from SBResource_MMIO register\n",
val);
goto setup_wdt;
} else
pr_debug("MMIO address 0x%04x already in use\n", val);
} else
pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);
/*
* Lastly re-programming the watchdog timer MMIO address,
* This method is a last resort...
*
* Before re-programming, to ensure that the watchdog timer
* is disabled, disable the watchdog timer.
*/
tco_timer_disable();
if (force_addr) {
/*
* Force the use of watchdog timer MMIO address, and aligned to
* 8byte boundary.
*/
force_addr &= ~0x7;
val = force_addr;
pr_info("Force the use of 0x%04x as MMIO address\n", val);
} else {
/*
* Get empty slot into the resource tree for watchdog timer.
*/
if (allocate_resource(&iomem_resource,
&wdt_res,
SP5100_WDT_MEM_MAP_SIZE,
0xf0000000,
0xfffffff8,
0x8,
NULL,
NULL)) {
pr_err("MMIO allocation failed\n");
goto unreg_region;
}
val = resbase_phys = wdt_res.start;
pr_debug("Got 0x%04x from resource tree\n", val);
}
/* Restore to the low three bits, if chipset is SB8x0(or later) */
if (sp5100_tco_pci->revision >= 0x40) {
u8 reserved_bit;
reserved_bit = inb(base_addr) & 0x7;
val |= (u32)reserved_bit;
}
/* Re-programming the watchdog timer base address */
outb(base_addr+0, index_reg);
/* Low three bits of BASE are reserved */
outb((val >> 0) & 0xf8, data_reg);
outb(base_addr+1, index_reg);
outb((val >> 8) & 0xff, data_reg);
outb(base_addr+2, index_reg);
outb((val >> 16) & 0xff, data_reg);
outb(base_addr+3, index_reg);
outb((val >> 24) & 0xff, data_reg);
/*
* Clear unnecessary the low three bits,
* if chipset is SB8x0(or later)
*/
if (sp5100_tco_pci->revision >= 0x40)
val &= ~0x7;
if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
"SP5100 TCO")) {
pr_err("mmio address 0x%04x already in use\n", val);
goto unreg_region;
dev_name)) {
pr_err("MMIO address 0x%04x already in use\n", val);
goto unreg_resource;
}
setup_wdt:
tcobase_phys = val;
tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
@ -318,26 +537,18 @@ static unsigned char sp5100_tco_setupdevice(void)
goto unreg_mem_region;
}
/* Enable watchdog decode bit */
pci_read_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
&val);
pr_info("Using 0x%04x for watchdog MMIO address\n", val);
val |= SP5100_PCI_WATCHDOG_DECODE_EN;
/* Setup the watchdog timer */
tco_timer_enable();
pci_write_config_dword(sp5100_tco_pci,
SP5100_PCI_WATCHDOG_MISC_REG,
val);
/* Enable Watchdog timer and set the resolution to 1 sec. */
outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
val |= SP5100_PM_WATCHDOG_SECOND_RES;
val &= ~SP5100_PM_WATCHDOG_DISABLE;
outb(val, SP5100_IO_PM_DATA_REG);
/* Check that the watchdog action is set to reset the system. */
/* Check that the watchdog action is set to reset the system */
val = readl(SP5100_WDT_CONTROL(tcobase));
/*
* Save WatchDogFired status, because WatchDogFired flag is
* cleared here.
*/
tco_wdt_fired = val & SP5100_PM_WATCHDOG_FIRED;
val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
writel(val, SP5100_WDT_CONTROL(tcobase));
@ -355,6 +566,9 @@ static unsigned char sp5100_tco_setupdevice(void)
unreg_mem_region:
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
unreg_resource:
if (resbase_phys)
release_resource(&wdt_res);
unreg_region:
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
exit:
@ -364,23 +578,18 @@ static unsigned char sp5100_tco_setupdevice(void)
static int sp5100_tco_init(struct platform_device *dev)
{
int ret;
u32 val;
char addr_str[16];
/* Check whether or not the hardware watchdog is there. If found, then
/*
* Check whether or not the hardware watchdog is there. If found, then
* set it up.
*/
if (!sp5100_tco_setupdevice())
return -ENODEV;
/* Check to see if last reboot was due to watchdog timeout */
pr_info("Watchdog reboot %sdetected\n",
readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
"" : "not ");
/* Clear out the old status */
val = readl(SP5100_WDT_CONTROL(tcobase));
val &= ~SP5100_PM_WATCHDOG_FIRED;
writel(val, SP5100_WDT_CONTROL(tcobase));
pr_info("Last reboot was %striggered by watchdog.\n",
tco_wdt_fired ? "" : "not ");
/*
* Check that the heartbeat value is within it's range.
@ -400,14 +609,24 @@ static int sp5100_tco_init(struct platform_device *dev)
clear_bit(0, &timer_alive);
pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
tcobase, heartbeat, nowayout);
/* Show module parameters */
if (force_addr == tcobase_phys)
/* The force_addr is vaild */
sprintf(addr_str, "0x%04x", force_addr);
else
strcpy(addr_str, "none");
pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d, "
"force_addr=%s)\n",
tcobase, heartbeat, nowayout, addr_str);
return 0;
exit:
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
if (resbase_phys)
release_resource(&wdt_res);
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
return ret;
}
@ -422,6 +641,8 @@ static void sp5100_tco_cleanup(void)
misc_deregister(&sp5100_tco_miscdev);
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
if (resbase_phys)
release_resource(&wdt_res);
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
}
@ -451,7 +672,7 @@ static int __init sp5100_tco_init_module(void)
{
int err;
pr_info("SP5100 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
pr_info("SP5100/SB800 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
err = platform_driver_register(&sp5100_tco_driver);
if (err)
@ -475,13 +696,13 @@ static void __exit sp5100_tco_cleanup_module(void)
{
platform_device_unregister(sp5100_tco_platform_device);
platform_driver_unregister(&sp5100_tco_driver);
pr_info("SP5100 TCO Watchdog Module Unloaded\n");
pr_info("SP5100/SB800 TCO Watchdog Module Unloaded\n");
}
module_init(sp5100_tco_init_module);
module_exit(sp5100_tco_cleanup_module);
MODULE_AUTHOR("Priyanka Gupta");
MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

46
drivers/watchdog/sp5100_tco.h
View file

@ -9,33 +9,57 @@
/*
* Some address definitions for the Watchdog
*/
#define SP5100_WDT_MEM_MAP_SIZE 0x08
#define SP5100_WDT_CONTROL(base) ((base) + 0x00) /* Watchdog Control */
#define SP5100_WDT_COUNT(base) ((base) + 0x04) /* Watchdog Count */
#define SP5100_WDT_START_STOP_BIT 1
#define SP5100_WDT_START_STOP_BIT (1 << 0)
#define SP5100_WDT_TRIGGER_BIT (1 << 7)
#define SP5100_PCI_WATCHDOG_MISC_REG 0x41
#define SP5100_PCI_WATCHDOG_DECODE_EN (1 << 3)
#define SP5100_PM_IOPORTS_SIZE 0x02
/* These two IO registers are hardcoded and there doesn't seem to be a way to
/*
* These two IO registers are hardcoded and there doesn't seem to be a way to
* read them from a register.
*/
/* For SP5100/SB7x0 chipset */
#define SP5100_IO_PM_INDEX_REG 0xCD6
#define SP5100_IO_PM_DATA_REG 0xCD7
#define SP5100_SB_RESOURCE_MMIO_BASE 0x9C
#define SP5100_PM_WATCHDOG_CONTROL 0x69
#define SP5100_PM_WATCHDOG_BASE0 0x6C
#define SP5100_PM_WATCHDOG_BASE1 0x6D
#define SP5100_PM_WATCHDOG_BASE2 0x6E
#define SP5100_PM_WATCHDOG_BASE3 0x6F
#define SP5100_PM_WATCHDOG_BASE 0x6C
#define SP5100_PM_WATCHDOG_FIRED (1 << 1)
#define SP5100_PM_WATCHDOG_ACTION_RESET (1 << 2)
#define SP5100_PM_WATCHDOG_DISABLE 1
#define SP5100_PCI_WATCHDOG_MISC_REG 0x41
#define SP5100_PCI_WATCHDOG_DECODE_EN (1 << 3)
#define SP5100_PM_WATCHDOG_DISABLE (1 << 0)
#define SP5100_PM_WATCHDOG_SECOND_RES (3 << 1)
#define SP5100_DEVNAME "SP5100 TCO"
/* For SB8x0(or later) chipset */
#define SB800_IO_PM_INDEX_REG 0xCD6
#define SB800_IO_PM_DATA_REG 0xCD7
#define SB800_PM_ACPI_MMIO_EN 0x24
#define SB800_PM_WATCHDOG_CONTROL 0x48
#define SB800_PM_WATCHDOG_BASE 0x48
#define SB800_PM_WATCHDOG_CONFIG 0x4C
#define SB800_PCI_WATCHDOG_DECODE_EN (1 << 0)
#define SB800_PM_WATCHDOG_DISABLE (1 << 2)
#define SB800_PM_WATCHDOG_SECOND_RES (3 << 0)
#define SB800_ACPI_MMIO_DECODE_EN (1 << 0)
#define SB800_ACPI_MMIO_SEL (1 << 2)
#define SB800_PM_WDT_MMIO_OFFSET 0xB00
#define SB800_DEVNAME "SB800 TCO"

11
drivers/watchdog/sp805_wdt.c
View file

@ -130,16 +130,10 @@ static int wdt_config(struct watchdog_device *wdd, bool ping)
int ret;
if (!ping) {
ret = clk_prepare(wdt->clk);
if (ret) {
dev_err(&wdt->adev->dev, "clock prepare fail");
return ret;
}
ret = clk_enable(wdt->clk);
ret = clk_prepare_enable(wdt->clk);
if (ret) {
dev_err(&wdt->adev->dev, "clock enable fail");
clk_unprepare(wdt->clk);
return ret;
}
}
@ -190,8 +184,7 @@ static int wdt_disable(struct watchdog_device *wdd)
readl_relaxed(wdt->base + WDTLOCK);
spin_unlock(&wdt->lock);
clk_disable(wdt->clk);
clk_unprepare(wdt->clk);
clk_disable_unprepare(wdt->clk);
return 0;
}

185
drivers/watchdog/twl4030_wdt.c
View file

@ -22,26 +22,12 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/i2c/twl.h>
#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
#define TWL4030_WDT_STATE_OPEN 0x1
#define TWL4030_WDT_STATE_ACTIVE 0x8
static struct platform_device *twl4030_wdt_dev;
struct twl4030_wdt {
struct miscdevice miscdev;
int timer_margin;
unsigned long state;
};
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
@ -49,175 +35,75 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
static int twl4030_wdt_write(unsigned char val)
{
return twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, val,
return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
TWL4030_WATCHDOG_CFG_REG_OFFS);
}
static int twl4030_wdt_enable(struct twl4030_wdt *wdt)
static int twl4030_wdt_start(struct watchdog_device *wdt)
{
return twl4030_wdt_write(wdt->timer_margin + 1);
return twl4030_wdt_write(wdt->timeout + 1);
}
static int twl4030_wdt_disable(struct twl4030_wdt *wdt)
static int twl4030_wdt_stop(struct watchdog_device *wdt)
{
return twl4030_wdt_write(0);
}
static int twl4030_wdt_set_timeout(struct twl4030_wdt *wdt, int timeout)
static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
unsigned int timeout)
{
if (timeout < 0 || timeout > 30) {
dev_warn(wdt->miscdev.parent,
"Timeout can only be in the range [0-30] seconds");
return -EINVAL;
}
wdt->timer_margin = timeout;
return twl4030_wdt_enable(wdt);
}
static ssize_t twl4030_wdt_write_fop(struct file *file,
const char __user *data, size_t len, loff_t *ppos)
{
struct twl4030_wdt *wdt = file->private_data;
if (len)
twl4030_wdt_enable(wdt);
return len;
}
static long twl4030_wdt_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_margin;
struct twl4030_wdt *wdt = file->private_data;
static const struct watchdog_info twl4030_wd_ident = {
.identity = "TWL4030 Watchdog",
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &twl4030_wd_ident,
sizeof(twl4030_wd_ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
twl4030_wdt_enable(wdt);
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, p))
return -EFAULT;
if (twl4030_wdt_set_timeout(wdt, new_margin))
return -EINVAL;
return put_user(wdt->timer_margin, p);
case WDIOC_GETTIMEOUT:
return put_user(wdt->timer_margin, p);
default:
return -ENOTTY;
}
wdt->timeout = timeout;
return 0;
}
static int twl4030_wdt_open(struct inode *inode, struct file *file)
{
struct twl4030_wdt *wdt = platform_get_drvdata(twl4030_wdt_dev);
static const struct watchdog_info twl4030_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "TWL4030 Watchdog",
};
/* /dev/watchdog can only be opened once */
if (test_and_set_bit(0, &wdt->state))
return -EBUSY;
wdt->state |= TWL4030_WDT_STATE_ACTIVE;
file->private_data = (void *) wdt;
twl4030_wdt_enable(wdt);
return nonseekable_open(inode, file);
}
static int twl4030_wdt_release(struct inode *inode, struct file *file)
{
struct twl4030_wdt *wdt = file->private_data;
if (nowayout) {
dev_alert(wdt->miscdev.parent,
"Unexpected close, watchdog still running!\n");
twl4030_wdt_enable(wdt);
} else {
if (twl4030_wdt_disable(wdt))
return -EFAULT;
wdt->state &= ~TWL4030_WDT_STATE_ACTIVE;
}
clear_bit(0, &wdt->state);
return 0;
}
static const struct file_operations twl4030_wdt_fops = {
static const struct watchdog_ops twl4030_wdt_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = twl4030_wdt_open,
.release = twl4030_wdt_release,
.unlocked_ioctl = twl4030_wdt_ioctl,
.write = twl4030_wdt_write_fop,
.start = twl4030_wdt_start,
.stop = twl4030_wdt_stop,
.set_timeout = twl4030_wdt_set_timeout,
};
static int twl4030_wdt_probe(struct platform_device *pdev)
{
int ret = 0;
struct twl4030_wdt *wdt;
struct watchdog_device *wdt;
wdt = kzalloc(sizeof(struct twl4030_wdt), GFP_KERNEL);
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
wdt->state = 0;
wdt->timer_margin = 30;
wdt->miscdev.parent = &pdev->dev;
wdt->miscdev.fops = &twl4030_wdt_fops;
wdt->miscdev.minor = WATCHDOG_MINOR;
wdt->miscdev.name = "watchdog";
wdt->info = &twl4030_wdt_info;
wdt->ops = &twl4030_wdt_ops;
wdt->status = 0;
wdt->timeout = 30;
wdt->min_timeout = 1;
wdt->max_timeout = 30;
watchdog_set_nowayout(wdt, nowayout);
platform_set_drvdata(pdev, wdt);
twl4030_wdt_dev = pdev;
twl4030_wdt_stop(wdt);
twl4030_wdt_disable(wdt);
ret = misc_register(&wdt->miscdev);
ret = watchdog_register_device(wdt);
if (ret) {
dev_err(wdt->miscdev.parent,
"Failed to register misc device\n");
platform_set_drvdata(pdev, NULL);
kfree(wdt);
twl4030_wdt_dev = NULL;
return ret;
}
return 0;
}
static int twl4030_wdt_remove(struct platform_device *pdev)
{
struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
if (twl4030_wdt_disable(wdt))
return -EFAULT;
wdt->state &= ~TWL4030_WDT_STATE_ACTIVE;
misc_deregister(&wdt->miscdev);
struct watchdog_device *wdt = platform_get_drvdata(pdev);
watchdog_unregister_device(wdt);
platform_set_drvdata(pdev, NULL);
kfree(wdt);
twl4030_wdt_dev = NULL;
return 0;
}
@ -225,18 +111,18 @@ static int twl4030_wdt_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
return twl4030_wdt_disable(wdt);
struct watchdog_device *wdt = platform_get_drvdata(pdev);
if (watchdog_active(wdt))
return twl4030_wdt_stop(wdt);
return 0;
}
static int twl4030_wdt_resume(struct platform_device *pdev)
{
struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
return twl4030_wdt_enable(wdt);
struct watchdog_device *wdt = platform_get_drvdata(pdev);
if (watchdog_active(wdt))
return twl4030_wdt_start(wdt);
return 0;
}
@ -260,6 +146,5 @@ module_platform_driver(twl4030_wdt_driver);
MODULE_AUTHOR("Nokia Corporation");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:twl4030_wdt");

2
include/linux/watchdog.h
View file

@ -129,7 +129,7 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
return wdd->driver_data;
}
/* drivers/watchdog/core/watchdog_core.c */
/* drivers/watchdog/watchdog_core.c */
extern int watchdog_register_device(struct watchdog_device *);
extern void watchdog_unregister_device(struct watchdog_device *);