[WATCHDOG] Orion: add hardware watchdog support
This patch allows the use of the hardware watchdog in the Marvell Orion series of ARM SoCs. Signed-off-by: Sylver Bruneau <sylver.bruneau@googlemail.com> Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Sylver Bruneau
Wim Van Sebroeck
parent
b3112180fe
commit
22ac92322c
4 changed files with 243 additions and 0 deletions
|
|
@ -153,9 +153,11 @@
|
|||
#define CPU_CONF ORION5X_BRIDGE_REG(0x100)
|
||||
#define CPU_CTRL ORION5X_BRIDGE_REG(0x104)
|
||||
#define CPU_RESET_MASK ORION5X_BRIDGE_REG(0x108)
|
||||
#define WDT_RESET 0x0002
|
||||
#define CPU_SOFT_RESET ORION5X_BRIDGE_REG(0x10c)
|
||||
#define POWER_MNG_CTRL_REG ORION5X_BRIDGE_REG(0x11C)
|
||||
#define BRIDGE_CAUSE ORION5X_BRIDGE_REG(0x110)
|
||||
#define WDT_INT_REQ 0x0008
|
||||
#define BRIDGE_MASK ORION5X_BRIDGE_REG(0x114)
|
||||
#define BRIDGE_INT_TIMER0 0x0002
|
||||
#define BRIDGE_INT_TIMER1 0x0004
|
||||
|
|
|
|||
|
|
@ -224,6 +224,15 @@ config DAVINCI_WATCHDOG
|
|||
NOTE: once enabled, this timer cannot be disabled.
|
||||
Say N if you are unsure.
|
||||
|
||||
config ORION5X_WATCHDOG
|
||||
tristate "Orion5x watchdog"
|
||||
depends on ARCH_ORION5X
|
||||
help
|
||||
Say Y here if to include support for the watchdog timer
|
||||
in the Orion5x ARM SoCs.
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called orion5x_wdt.
|
||||
|
||||
# ARM26 Architecture
|
||||
|
||||
# AVR32 Architecture
|
||||
|
|
|
|||
|
|
@ -40,6 +40,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
|
|||
obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
|
||||
obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
|
||||
obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
|
||||
obj-$(CONFIG_ORION5X_WATCHDOG) += orion5x_wdt.o
|
||||
|
||||
# ARM26 Architecture
|
||||
|
||||
|
|
|
|||
231
drivers/watchdog/orion5x_wdt.c
Normal file
231
drivers/watchdog/orion5x_wdt.c
Normal file
|
|
@ -0,0 +1,231 @@
|
|||
/*
|
||||
* drivers/watchdog/orion5x_wdt.c
|
||||
*
|
||||
* Watchdog driver for Orion5x 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.
|
||||
*/
|
||||
|
||||
#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/watchdog.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
/*
|
||||
* Watchdog timer block registers.
|
||||
*/
|
||||
#define TIMER_CTRL (TIMER_VIRT_BASE + 0x0000)
|
||||
#define WDT_EN 0x0010
|
||||
#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
|
||||
|
||||
#define WDT_MAX_DURATION (0xffffffff / ORION5X_TCLK)
|
||||
#define WDT_IN_USE 0
|
||||
#define WDT_OK_TO_CLOSE 1
|
||||
|
||||
static int nowayout = WATCHDOG_NOWAYOUT;
|
||||
static int heartbeat = WDT_MAX_DURATION; /* (seconds) */
|
||||
static unsigned long wdt_status;
|
||||
|
||||
static void wdt_enable(void)
|
||||
{
|
||||
u32 reg;
|
||||
|
||||
/* Set watchdog duration */
|
||||
writel(ORION5X_TCLK * heartbeat, WDT_VAL);
|
||||
|
||||
/* Clear watchdog timer interrupt */
|
||||
reg = readl(BRIDGE_CAUSE);
|
||||
reg &= ~WDT_INT_REQ;
|
||||
writel(reg, BRIDGE_CAUSE);
|
||||
|
||||
/* Enable watchdog timer */
|
||||
reg = readl(TIMER_CTRL);
|
||||
reg |= WDT_EN;
|
||||
writel(reg, TIMER_CTRL);
|
||||
|
||||
/* Enable reset on watchdog */
|
||||
reg = readl(CPU_RESET_MASK);
|
||||
reg |= WDT_RESET;
|
||||
writel(reg, CPU_RESET_MASK);
|
||||
}
|
||||
|
||||
static void wdt_disable(void)
|
||||
{
|
||||
u32 reg;
|
||||
|
||||
/* Disable reset on watchdog */
|
||||
reg = readl(CPU_RESET_MASK);
|
||||
reg &= ~WDT_RESET;
|
||||
writel(reg, CPU_RESET_MASK);
|
||||
|
||||
/* Disable watchdog timer */
|
||||
reg = readl(TIMER_CTRL);
|
||||
reg &= ~WDT_EN;
|
||||
writel(reg, TIMER_CTRL);
|
||||
}
|
||||
|
||||
static int orion5x_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);
|
||||
wdt_enable();
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int orion5x_wdt_get_timeleft(int *time_left)
|
||||
{
|
||||
*time_left = readl(WDT_VAL) / ORION5X_TCLK;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t orion5x_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);
|
||||
}
|
||||
}
|
||||
wdt_enable();
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
static struct watchdog_info ident = {
|
||||
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
|
||||
WDIOF_KEEPALIVEPING,
|
||||
.identity = "Orion5x Watchdog",
|
||||
};
|
||||
|
||||
|
||||
static long orion5x_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:
|
||||
wdt_enable();
|
||||
ret = 0;
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
ret = get_user(time, (int *)arg);
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
if (time <= 0 || time > WDT_MAX_DURATION) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
heartbeat = time;
|
||||
wdt_enable();
|
||||
/* Fall through */
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
ret = put_user(heartbeat, (int *)arg);
|
||||
break;
|
||||
|
||||
case WDIOC_GETTIMELEFT:
|
||||
if (orion5x_wdt_get_timeleft(&time)) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
ret = put_user(time, (int *)arg);
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int orion5x_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
|
||||
wdt_disable();
|
||||
else
|
||||
printk(KERN_CRIT "WATCHDOG: 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 orion5x_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = orion5x_wdt_write,
|
||||
.unlocked_ioctl = orion5x_wdt_ioctl,
|
||||
.open = orion5x_wdt_open,
|
||||
.release = orion5x_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice orion5x_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &orion5x_wdt_fops,
|
||||
};
|
||||
|
||||
static int __init orion5x_wdt_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = misc_register(&orion5x_wdt_miscdev);
|
||||
if (ret == 0)
|
||||
printk("Orion5x Watchdog Timer: heartbeat %d sec\n",
|
||||
heartbeat);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit orion5x_wdt_exit(void)
|
||||
{
|
||||
misc_deregister(&orion5x_wdt_miscdev);
|
||||
}
|
||||
|
||||
module_init(orion5x_wdt_init);
|
||||
module_exit(orion5x_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
|
||||
MODULE_DESCRIPTION("Orion5x Processor Watchdog");
|
||||
|
||||
module_param(heartbeat, int, 0);
|
||||
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default is "
|
||||
__MODULE_STRING(WDT_MAX_DURATION) ")");
|
||||
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
Loading…
Reference in a new issue