ramips: add watchdog driver

SVN-Revision: 25126
master
Gabor Juhos 14 years ago
parent f38367fcb4
commit 16366feafb
  1. 355
      target/linux/ramips/files/drivers/watchdog/ramips_wdt.c
  2. 26
      target/linux/ramips/patches-2.6.36/104-ramips-watchdog-driver.patch
  3. 1
      target/linux/ramips/rt288x/config-2.6.36
  4. 1
      target/linux/ramips/rt305x/config-2.6.36

@ -0,0 +1,355 @@
/*
* Ralink RT288X/RT305X built-in hardware watchdog timer
*
* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
*
* This driver was based on: drivers/watchdog/ixp4xx_wdt.c
* Author: Deepak Saxena <dsaxena@plexity.net>
* Copyright 2004 (c) MontaVista, Software, Inc.
*
* which again was based on sa1100 driver,
* Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
*
* parts of the driver are based on Ralink's 2.6.21 BSP
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/clk.h>
#include <linux/err.h>
#define DRIVER_NAME "ramips-wdt"
#define RAMIPS_WDT_TIMEOUT 20 /* seconds */
#define RAMIPS_WDT_PRESCALE 65536
#define TIMER_REG_TMRSTAT 0x00
#define TIMER_REG_TMR1LOAD 0x20
#define TIMER_REG_TMR1CTL 0x28
#define TMRSTAT_TMR1RST BIT(5)
#define TMR1CTL_ENABLE BIT(7)
#define TMR1CTL_MODE_SHIFT 4
#define TMR1CTL_MODE_MASK 0x3
#define TMR1CTL_MODE_FREE_RUNNING 0x0
#define TMR1CTL_MODE_PERIODIC 0x1
#define TMR1CTL_MODE_TIMEOUT 0x2
#define TMR1CTL_MODE_WDT 0x3
#define TMR1CTL_PRESCALE_MASK 0xf
#define TMR1CTL_PRESCALE_65536 0xf
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static int ramips_wdt_timeout = RAMIPS_WDT_TIMEOUT;
module_param_named(timeout, ramips_wdt_timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds "
"(default=" __MODULE_STRING(RAMIPS_WDT_TIMEOUT) "s)");
static unsigned long ramips_wdt_flags;
#define WDT_FLAGS_BUSY 0
#define WDT_FLAGS_EXPECT_CLOSE 1
static struct clk *ramips_wdt_clk;
static unsigned long ramips_wdt_freq;
static int ramips_wdt_max_timeout;
static void __iomem *ramips_wdt_base;
static inline void ramips_wdt_wr(unsigned reg, u32 val)
{
__raw_writel(val, ramips_wdt_base + reg);
}
static inline u32 ramips_wdt_rr(unsigned reg)
{
return __raw_readl(ramips_wdt_base + reg);
}
static inline void ramips_wdt_keepalive(void)
{
ramips_wdt_wr(TIMER_REG_TMR1LOAD, ramips_wdt_timeout * ramips_wdt_freq);
}
static inline void ramips_wdt_enable(void)
{
u32 t;
ramips_wdt_keepalive();
t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
t |= TMR1CTL_ENABLE;
ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
}
static inline void ramips_wdt_disable(void)
{
u32 t;
ramips_wdt_keepalive();
t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
t &= ~TMR1CTL_ENABLE;
ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
}
static int ramips_wdt_set_timeout(int val)
{
if (val < 1 || val > ramips_wdt_max_timeout) {
pr_crit(DRIVER_NAME
": timeout value %d must be 0 < timeout < %d\n",
val, ramips_wdt_max_timeout);
return -EINVAL;
}
ramips_wdt_timeout = val;
ramips_wdt_keepalive();
return 0;
}
static int ramips_wdt_open(struct inode *inode, struct file *file)
{
u32 t;
if (test_and_set_bit(WDT_FLAGS_BUSY, &ramips_wdt_flags))
return -EBUSY;
clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags);
t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
t &= ~(TMR1CTL_MODE_MASK << TMR1CTL_MODE_SHIFT |
TMR1CTL_PRESCALE_MASK);
t |= (TMR1CTL_MODE_WDT << TMR1CTL_MODE_SHIFT |
TMR1CTL_PRESCALE_65536);
ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
ramips_wdt_enable();
return nonseekable_open(inode, file);
}
static int ramips_wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags))
ramips_wdt_disable();
else {
pr_crit(DRIVER_NAME ": device closed unexpectedly, "
"watchdog timer will not stop!\n");
ramips_wdt_keepalive();
}
clear_bit(WDT_FLAGS_BUSY, &ramips_wdt_flags);
clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags);
return 0;
}
static ssize_t ramips_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
if (len) {
if (!nowayout) {
size_t i;
clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags);
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
set_bit(WDT_FLAGS_EXPECT_CLOSE,
&ramips_wdt_flags);
}
}
ramips_wdt_keepalive();
}
return len;
}
static const struct watchdog_info ramips_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.firmware_version = 0,
.identity = "RAMIPS watchdog",
};
static long ramips_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int err;
int t;
switch (cmd) {
case WDIOC_GETSUPPORT:
err = copy_to_user(argp, &ramips_wdt_info,
sizeof(ramips_wdt_info)) ? -EFAULT : 0;
break;
case WDIOC_GETSTATUS:
err = put_user(0, p);
break;
case WDIOC_KEEPALIVE:
ramips_wdt_keepalive();
err = 0;
break;
case WDIOC_SETTIMEOUT:
err = get_user(t, p);
if (err)
break;
err = ramips_wdt_set_timeout(t);
if (err)
break;
/* fallthrough */
case WDIOC_GETTIMEOUT:
err = put_user(ramips_wdt_timeout, p);
break;
default:
err = -ENOTTY;
break;
}
return err;
}
static const struct file_operations ramips_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = ramips_wdt_write,
.unlocked_ioctl = ramips_wdt_ioctl,
.open = ramips_wdt_open,
.release = ramips_wdt_release,
};
static struct miscdevice ramips_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &ramips_wdt_fops,
};
static int __devinit ramips_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
int err;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no memory resource found\n");
return -EINVAL;
}
ramips_wdt_base = ioremap(res->start, resource_size(res));
if (!ramips_wdt_base)
return -ENOMEM;
ramips_wdt_clk = clk_get(&pdev->dev, "wdt");
if (IS_ERR(ramips_wdt_clk)) {
err = PTR_ERR(ramips_wdt_clk);
goto err_unmap;
}
err = clk_enable(ramips_wdt_clk);
if (err)
goto err_clk_put;
ramips_wdt_freq = clk_get_rate(ramips_wdt_clk) / RAMIPS_WDT_PRESCALE;
if (!ramips_wdt_freq) {
err = -EINVAL;
goto err_clk_disable;
}
ramips_wdt_max_timeout = (0xfffful / ramips_wdt_freq);
if (ramips_wdt_timeout < 1 ||
ramips_wdt_timeout > ramips_wdt_max_timeout) {
ramips_wdt_timeout = ramips_wdt_max_timeout;
dev_info(&pdev->dev,
"timeout value must be 0 < timeout < %d, using %d\n",
ramips_wdt_max_timeout, ramips_wdt_timeout);
}
err = misc_register(&ramips_wdt_miscdev);
if (err) {
dev_err(&pdev->dev,
"unable to register misc device, err=%d\n", err);
goto err_clk_disable;
}
return 0;
err_clk_disable:
clk_disable(ramips_wdt_clk);
err_clk_put:
clk_put(ramips_wdt_clk);
err_unmap:
iounmap(ramips_wdt_base);
return err;
}
static int __devexit ramips_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&ramips_wdt_miscdev);
clk_disable(ramips_wdt_clk);
clk_put(ramips_wdt_clk);
iounmap(ramips_wdt_base);
return 0;
}
static void ramips_wdt_shutdown(struct platform_device *pdev)
{
ramips_wdt_disable();
}
static struct platform_driver ramips_wdt_driver = {
.remove = __devexit_p(ramips_wdt_remove),
.shutdown = ramips_wdt_shutdown,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init ramips_wdt_init(void)
{
return platform_driver_probe(&ramips_wdt_driver, ramips_wdt_probe);
}
module_init(ramips_wdt_init);
static void __exit ramips_wdt_exit(void)
{
platform_driver_unregister(&ramips_wdt_driver);
}
module_exit(ramips_wdt_exit);
MODULE_DESCRIPTION("Ralink RT288X/RT305X hardware watchdog driver");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

@ -0,0 +1,26 @@
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -916,6 +916,13 @@ config OCTEON_WDT
from the first interrupt, it is then only poked when the
device is written.
+config RAMIPS_WDT
+ tristate "Ralink RT288X/RT305X Watchdog Timer"
+ depends on SOC_RT288X || SOC_RT305X
+ help
+ Hardware driver for the built-in watchdog timer on the
+ Ralink RT288X/RT305X SoCs.
+
# PARISC Architecture
# POWERPC Architecture
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -118,6 +118,7 @@ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
+obj-$(CONFIG_RAMIPS_WDT) += ramips_wdt.o
# PARISC Architecture

@ -78,6 +78,7 @@ CONFIG_RALINK_DEV_GPIO_BUTTONS=y
CONFIG_RALINK_DEV_GPIO_LEDS=y
CONFIG_RALINK_RT288X=y
# CONFIG_RALINK_RT305X is not set
CONFIG_RAMIPS_WDT=y
CONFIG_RT288X_MACH_RT_N15=y
CONFIG_RT288X_MACH_WZR_AGL300NH=y
CONFIG_RTL8366S_PHY=y

@ -74,6 +74,7 @@ CONFIG_RALINK_DEV_GPIO_BUTTONS=y
CONFIG_RALINK_DEV_GPIO_LEDS=y
# CONFIG_RALINK_RT288X is not set
CONFIG_RALINK_RT305X=y
CONFIG_RAMIPS_WDT=y
CONFIG_RT305X_MACH_DIR_300_REVB=y
CONFIG_RT305X_MACH_F5D8235_V2=y
CONFIG_RT305X_MACH_FONERA20N=y

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