mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 14:02:10 +00:00
[WATCHDOG] mv64x60_wdt.patch
Add mv64x60 (Marvell Discovery) watchdog support. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
James Chapman
Wim Van Sebroeck
parent
180536f827
commit
3be10211ab
@ -346,6 +346,10 @@ config 8xx_WDT
|
||||
tristate "MPC8xx Watchdog Timer"
|
||||
depends on WATCHDOG && 8xx
|
||||
|
||||
config MV64X60_WDT
|
||||
tristate "MV64X60 (Marvell Discovery) Watchdog Timer"
|
||||
depends on WATCHDOG && MV64X60
|
||||
|
||||
config BOOKE_WDT
|
||||
tristate "PowerPC Book-E Watchdog Timer"
|
||||
depends on WATCHDOG && (BOOKE || 4xx)
|
||||
|
||||
@ -50,6 +50,7 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o
|
||||
|
||||
# PowerPC Architecture
|
||||
obj-$(CONFIG_8xx_WDT) += mpc8xx_wdt.o
|
||||
obj-$(CONFIG_MV64X60_WDT) += mv64x60_wdt.o
|
||||
obj-$(CONFIG_BOOKE_WDT) += booke_wdt.o
|
||||
|
||||
# PPC64 Architecture
|
||||
|
||||
252
drivers/char/watchdog/mv64x60_wdt.c
Normal file
252
drivers/char/watchdog/mv64x60_wdt.c
Normal file
@ -0,0 +1,252 @@
|
||||
/*
|
||||
* mv64x60_wdt.c - MV64X60 (Marvell Discovery) watchdog userspace interface
|
||||
*
|
||||
* Author: James Chapman <jchapman@katalix.com>
|
||||
*
|
||||
* Platform-specific setup code should configure the dog to generate
|
||||
* interrupt or reset as required. This code only enables/disables
|
||||
* and services the watchdog.
|
||||
*
|
||||
* Derived from mpc8xx_wdt.c, with the following copyright.
|
||||
*
|
||||
* 2002 (c) Florian Schirmer <jolt@tuxbox.org> 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/config.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <asm/mv64x60.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
/* MV64x60 WDC (config) register access definitions */
|
||||
#define MV64x60_WDC_CTL1_MASK (3 << 24)
|
||||
#define MV64x60_WDC_CTL1(val) ((val & 3) << 24)
|
||||
#define MV64x60_WDC_CTL2_MASK (3 << 26)
|
||||
#define MV64x60_WDC_CTL2(val) ((val & 3) << 26)
|
||||
|
||||
/* Flags bits */
|
||||
#define MV64x60_WDOG_FLAG_OPENED 0
|
||||
#define MV64x60_WDOG_FLAG_ENABLED 1
|
||||
|
||||
static unsigned long wdt_flags;
|
||||
static int wdt_status;
|
||||
static void __iomem *mv64x60_regs;
|
||||
static int mv64x60_wdt_timeout;
|
||||
|
||||
static void mv64x60_wdt_reg_write(u32 val)
|
||||
{
|
||||
/* Allow write only to CTL1 / CTL2 fields, retaining values in
|
||||
* other fields.
|
||||
*/
|
||||
u32 data = readl(mv64x60_regs + MV64x60_WDT_WDC);
|
||||
data &= ~(MV64x60_WDC_CTL1_MASK | MV64x60_WDC_CTL2_MASK);
|
||||
data |= val;
|
||||
writel(data, mv64x60_regs + MV64x60_WDT_WDC);
|
||||
}
|
||||
|
||||
static void mv64x60_wdt_service(void)
|
||||
{
|
||||
/* Write 01 followed by 10 to CTL2 */
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL2(0x01));
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL2(0x02));
|
||||
}
|
||||
|
||||
static void mv64x60_wdt_handler_disable(void)
|
||||
{
|
||||
if (test_and_clear_bit(MV64x60_WDOG_FLAG_ENABLED, &wdt_flags)) {
|
||||
/* Write 01 followed by 10 to CTL1 */
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL1(0x01));
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL1(0x02));
|
||||
printk(KERN_NOTICE "mv64x60_wdt: watchdog deactivated\n");
|
||||
}
|
||||
}
|
||||
|
||||
static void mv64x60_wdt_handler_enable(void)
|
||||
{
|
||||
if (!test_and_set_bit(MV64x60_WDOG_FLAG_ENABLED, &wdt_flags)) {
|
||||
/* Write 01 followed by 10 to CTL1 */
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL1(0x01));
|
||||
mv64x60_wdt_reg_write(MV64x60_WDC_CTL1(0x02));
|
||||
printk(KERN_NOTICE "mv64x60_wdt: watchdog activated\n");
|
||||
}
|
||||
}
|
||||
|
||||
static int mv64x60_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags))
|
||||
return -EBUSY;
|
||||
|
||||
mv64x60_wdt_service();
|
||||
mv64x60_wdt_handler_enable();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mv64x60_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
mv64x60_wdt_service();
|
||||
|
||||
#if !defined(CONFIG_WATCHDOG_NOWAYOUT)
|
||||
mv64x60_wdt_handler_disable();
|
||||
#endif
|
||||
|
||||
clear_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t mv64x60_wdt_write(struct file *file, const char *data,
|
||||
size_t len, loff_t * ppos)
|
||||
{
|
||||
if (*ppos != file->f_pos)
|
||||
return -ESPIPE;
|
||||
|
||||
if (len)
|
||||
mv64x60_wdt_service();
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static int mv64x60_wdt_ioctl(struct inode *inode, struct file *file,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int timeout;
|
||||
static struct watchdog_info info = {
|
||||
.options = WDIOF_KEEPALIVEPING,
|
||||
.firmware_version = 0,
|
||||
.identity = "MV64x60 watchdog",
|
||||
};
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
if (copy_to_user((void *)arg, &info, sizeof(info)))
|
||||
return -EFAULT;
|
||||
break;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
if (put_user(wdt_status, (int *)arg))
|
||||
return -EFAULT;
|
||||
wdt_status &= ~WDIOF_KEEPALIVEPING;
|
||||
break;
|
||||
|
||||
case WDIOC_GETTEMP:
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
mv64x60_wdt_service();
|
||||
wdt_status |= WDIOF_KEEPALIVEPING;
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
timeout = mv64x60_wdt_timeout * HZ;
|
||||
if (put_user(timeout, (int *)arg))
|
||||
return -EFAULT;
|
||||
break;
|
||||
|
||||
default:
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct file_operations mv64x60_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = mv64x60_wdt_write,
|
||||
.ioctl = mv64x60_wdt_ioctl,
|
||||
.open = mv64x60_wdt_open,
|
||||
.release = mv64x60_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice mv64x60_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &mv64x60_wdt_fops,
|
||||
};
|
||||
|
||||
static int __devinit mv64x60_wdt_probe(struct device *dev)
|
||||
{
|
||||
struct platform_device *pd = to_platform_device(dev);
|
||||
struct mv64x60_wdt_pdata *pdata = pd->dev.platform_data;
|
||||
int bus_clk = 133;
|
||||
|
||||
mv64x60_wdt_timeout = 10;
|
||||
if (pdata) {
|
||||
mv64x60_wdt_timeout = pdata->timeout;
|
||||
bus_clk = pdata->bus_clk;
|
||||
}
|
||||
|
||||
mv64x60_regs = mv64x60_get_bridge_vbase();
|
||||
|
||||
writel((mv64x60_wdt_timeout * (bus_clk * 1000000)) >> 8,
|
||||
mv64x60_regs + MV64x60_WDT_WDC);
|
||||
|
||||
return misc_register(&mv64x60_wdt_miscdev);
|
||||
}
|
||||
|
||||
static int __devexit mv64x60_wdt_remove(struct device *dev)
|
||||
{
|
||||
misc_deregister(&mv64x60_wdt_miscdev);
|
||||
|
||||
mv64x60_wdt_service();
|
||||
mv64x60_wdt_handler_disable();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct device_driver mv64x60_wdt_driver = {
|
||||
.name = MV64x60_WDT_NAME,
|
||||
.bus = &platform_bus_type,
|
||||
.probe = mv64x60_wdt_probe,
|
||||
.remove = __devexit_p(mv64x60_wdt_remove),
|
||||
};
|
||||
|
||||
static struct platform_device *mv64x60_wdt_dev;
|
||||
|
||||
static int __init mv64x60_wdt_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
printk(KERN_INFO "MV64x60 watchdog driver\n");
|
||||
|
||||
mv64x60_wdt_dev = platform_device_register_simple(MV64x60_WDT_NAME,
|
||||
-1, NULL, 0);
|
||||
if (IS_ERR(mv64x60_wdt_dev)) {
|
||||
ret = PTR_ERR(mv64x60_wdt_dev);
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = driver_register(&mv64x60_wdt_driver);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit mv64x60_wdt_exit(void)
|
||||
{
|
||||
driver_unregister(&mv64x60_wdt_driver);
|
||||
platform_device_unregister(mv64x60_wdt_dev);
|
||||
}
|
||||
|
||||
module_init(mv64x60_wdt_init);
|
||||
module_exit(mv64x60_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
|
||||
MODULE_DESCRIPTION("MV64x60 watchdog driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
@ -119,6 +119,14 @@ extern spinlock_t mv64x60_lock;
|
||||
|
||||
#define MV64x60_64BIT_WIN_COUNT 24
|
||||
|
||||
/* Watchdog Platform Device, Driver Data */
|
||||
#define MV64x60_WDT_NAME "wdt"
|
||||
|
||||
struct mv64x60_wdt_pdata {
|
||||
int timeout; /* watchdog expiry in seconds, default 10 */
|
||||
int bus_clk; /* bus clock in MHz, default 133 */
|
||||
};
|
||||
|
||||
/*
|
||||
* Define a structure that's used to pass in config information to the
|
||||
* core routines.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user