--- /dev/null
+--- /dev/null
++++ b/drivers/watchdog/cns3xxx_wdt.c
+@@ -0,0 +1,465 @@
++/*******************************************************************************
++ *
++ * drivers/watchdog/cns3xxx_wdt.c
++ *
++ * Watchdog timer driver for the CNS3XXX SOCs
++ *
++ * Author: Scott Shu
++ *
++ * Copyright (c) 2008 Cavium Networks
++ *
++ * This file 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.
++ *
++ * This file is distributed in the hope that it will be useful,
++ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
++ * NONINFRINGEMENT. See the GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this file; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
++ * visit http://www.gnu.org/licenses/.
++ *
++ * This file may also be available under a different license from Cavium.
++ * Contact Cavium Networks for more information
++ *
++ ******************************************************************************/
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/types.h>
++#include <linux/miscdevice.h>
++#include <linux/watchdog.h>
++#include <linux/fs.h>
++#include <linux/reboot.h>
++#include <linux/init.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/uaccess.h>
++
++#include <asm/hardware/arm_twd.h>
++
++struct cns3xxx_wdt {
++ unsigned long timer_alive;
++ struct device *dev;
++ void __iomem *base;
++ int irq;
++ unsigned int perturb;
++ char expect_close;
++};
++
++static struct platform_device *cns3xxx_wdt_dev;
++extern unsigned int twd_timer_rate;
++static spinlock_t wdt_lock;
++
++#define TIMER_MARGIN 60
++static int cns3xxx_margin = TIMER_MARGIN;
++module_param(cns3xxx_margin, int, 0);
++MODULE_PARM_DESC(cns3xxx_margin,
++ "CNS3XXX timer margin in seconds. (0 < cns3xxx_margin < 65536, default="
++ __MODULE_STRING(TIMER_MARGIN) ")");
++
++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) ")");
++
++#define ONLY_TESTING 0
++static int cns3xxx_noboot = ONLY_TESTING;
++module_param(cns3xxx_noboot, int, 0);
++MODULE_PARM_DESC(cns3xxx_noboot, "CNS3XXX watchdog action, "
++ "set to 1 to ignore reboots, 0 to reboot (default="
++ __MODULE_STRING(ONLY_TESTING) ")");
++
++/*
++ * This is the interrupt handler. Note that we only use this
++ * in testing mode, so don't actually do a reboot here.
++ */
++static irqreturn_t cns3xxx_wdt_fire(int irq, void *arg)
++{
++ struct cns3xxx_wdt *wdt = arg;
++
++ /* Check it really was our interrupt */
++ if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
++ dev_printk(KERN_CRIT, wdt->dev,
++ "Triggered - Reboot ignored.\n");
++ /* Clear the interrupt on the watchdog */
++ writel(1, wdt->base + TWD_WDOG_INTSTAT);
++ return IRQ_HANDLED;
++ }
++ return IRQ_NONE;
++}
++
++/*
++ * cns3xxx_wdt_keepalive - reload the timer
++ *
++ * Note that the spec says a DIFFERENT value must be written to the reload
++ * register each time. The "perturb" variable deals with this by adding 1
++ * to the count every other time the function is called.
++ */
++static void cns3xxx_wdt_keepalive(struct cns3xxx_wdt *wdt)
++{
++ unsigned int count;
++
++ /* Assume prescale is set to 256 */
++ count = (twd_timer_rate / 256) * cns3xxx_margin;
++
++ /* Reload the counter */
++ spin_lock(&wdt_lock);
++ writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
++ wdt->perturb = wdt->perturb ? 0 : 1;
++ spin_unlock(&wdt_lock);
++}
++
++static void cns3xxx_wdt_stop(struct cns3xxx_wdt *wdt)
++{
++ spin_lock(&wdt_lock);
++ writel(0x12345678, wdt->base + TWD_WDOG_DISABLE);
++ writel(0x87654321, wdt->base + TWD_WDOG_DISABLE);
++ writel(0x0, wdt->base + TWD_WDOG_CONTROL);
++ spin_unlock(&wdt_lock);
++}
++
++static void cns3xxx_wdt_start(struct cns3xxx_wdt *wdt)
++{
++ dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
++
++ //spin_lock(&wdt_lock);
++ /* This loads the count register but does NOT start the count yet */
++ cns3xxx_wdt_keepalive(wdt);
++ spin_lock(&wdt_lock);
++
++ if (cns3xxx_noboot) {
++ /* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */
++ writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL);
++ } else {
++ /* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */
++ writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL);
++ }
++ spin_unlock(&wdt_lock);
++}
++
++static int cns3xxx_wdt_set_heartbeat(int t)
++{
++ if (t < 0x0001 || t > 0xFFFF)
++ return -EINVAL;
++
++ cns3xxx_margin = t;
++ return 0;
++}
++
++/*
++ * /dev/watchdog handling
++ */
++static int cns3xxx_wdt_open(struct inode *inode, struct file *file)
++{
++ struct cns3xxx_wdt *wdt = platform_get_drvdata(cns3xxx_wdt_dev);
++
++ if (test_and_set_bit(0, &wdt->timer_alive))
++ return -EBUSY;
++
++ if (nowayout)
++ __module_get(THIS_MODULE);
++
++ file->private_data = wdt;
++
++ /*
++ * Activate timer
++ */
++ cns3xxx_wdt_start(wdt);
++
++ return nonseekable_open(inode, file);
++}
++
++static int cns3xxx_wdt_release(struct inode *inode, struct file *file)
++{
++ struct cns3xxx_wdt *wdt = file->private_data;
++
++ /*
++ * Shut off the timer.
++ * Lock it in if it's a module and we set nowayout
++ */
++ if (wdt->expect_close == 42)
++ cns3xxx_wdt_stop(wdt);
++ else {
++ dev_printk(KERN_CRIT, wdt->dev,
++ "unexpected close, not stopping watchdog!\n");
++ cns3xxx_wdt_keepalive(wdt);
++ }
++ clear_bit(0, &wdt->timer_alive);
++ wdt->expect_close = 0;
++ return 0;
++}
++
++static ssize_t cns3xxx_wdt_write(struct file *file, const char *data,
++ size_t len, loff_t *ppos)
++{
++ struct cns3xxx_wdt *wdt = file->private_data;
++
++ /*
++ * Refresh the timer.
++ */
++ if (len) {
++ if (!nowayout) {
++ size_t i;
++
++ /* In case it was set long ago */
++ wdt->expect_close = 0;
++
++ for (i = 0; i != len; i++) {
++ char c;
++
++ if (get_user(c, data + i))
++ return -EFAULT;
++ if (c == 'V')
++ wdt->expect_close = 42;
++ }
++ }
++ cns3xxx_wdt_keepalive(wdt);
++ }
++ return len;
++}
++
++static struct watchdog_info ident = {
++ .options = WDIOF_SETTIMEOUT |
++ WDIOF_KEEPALIVEPING |
++ WDIOF_MAGICCLOSE,
++ .identity = "CNS3XXX Watchdog",
++};
++
++static long cns3xxx_wdt_ioctl(struct file *file, unsigned int cmd,
++ unsigned long arg)
++{
++ struct cns3xxx_wdt *wdt = file->private_data;
++ int ret;
++ union {
++ struct watchdog_info ident;
++ int i;
++ } uarg;
++
++ if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg))
++ return -ENOTTY;
++
++ if (_IOC_DIR(cmd) & _IOC_WRITE) {
++ ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd));
++ if (ret)
++ return -EFAULT;
++ }
++
++ switch (cmd) {
++ case WDIOC_GETSUPPORT:
++ uarg.ident = ident;
++ ret = 0;
++ break;
++
++ case WDIOC_GETSTATUS:
++ case WDIOC_GETBOOTSTATUS:
++ uarg.i = 0;
++ ret = 0;
++ break;
++
++ case WDIOC_SETOPTIONS:
++ ret = -EINVAL;
++ if (uarg.i & WDIOS_DISABLECARD) {
++ cns3xxx_wdt_stop(wdt);
++ ret = 0;
++ }
++ if (uarg.i & WDIOS_ENABLECARD) {
++ cns3xxx_wdt_start(wdt);
++ ret = 0;
++ }
++ break;
++
++ case WDIOC_KEEPALIVE:
++ cns3xxx_wdt_keepalive(wdt);
++ ret = 0;
++ break;
++
++ case WDIOC_SETTIMEOUT:
++ ret = cns3xxx_wdt_set_heartbeat(uarg.i);
++ if (ret)
++ break;
++
++ cns3xxx_wdt_keepalive(wdt);
++ /* Fall */
++ case WDIOC_GETTIMEOUT:
++ uarg.i = cns3xxx_margin;
++ ret = 0;
++ break;
++
++ default:
++ return -ENOTTY;
++ }
++
++ if (ret == 0 && _IOC_DIR(cmd) & _IOC_READ) {
++ ret = copy_to_user((void __user *)arg, &uarg, _IOC_SIZE(cmd));
++ if (ret)
++ ret = -EFAULT;
++ }
++ return ret;
++}
++
++/*
++ * System shutdown handler. Turn off the watchdog if we're
++ * restarting or halting the system.
++ */
++static void cns3xxx_wdt_shutdown(struct platform_device *dev)
++{
++ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
++
++ if (system_state == SYSTEM_RESTART || system_state == SYSTEM_HALT)
++ cns3xxx_wdt_stop(wdt);
++}
++
++/*
++ * Kernel Interfaces
++ */
++static const struct file_operations cns3xxx_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .write = cns3xxx_wdt_write,
++ .unlocked_ioctl = cns3xxx_wdt_ioctl,
++ .open = cns3xxx_wdt_open,
++ .release = cns3xxx_wdt_release,
++};
++
++static struct miscdevice cns3xxx_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &cns3xxx_wdt_fops,
++};
++
++static int __devinit cns3xxx_wdt_probe(struct platform_device *dev)
++{
++ struct cns3xxx_wdt *wdt;
++ struct resource *res;
++ int ret;
++
++ /* We only accept one device, and it must have an id of -1 */
++ if (dev->id != -1)
++ return -ENODEV;
++
++ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
++ if (!res) {
++ ret = -ENODEV;
++ goto err_out;
++ }
++
++ wdt = kzalloc(sizeof(struct cns3xxx_wdt), GFP_KERNEL);
++ if (!wdt) {
++ ret = -ENOMEM;
++ goto err_out;
++ }
++
++ wdt->dev = &dev->dev;
++ wdt->irq = platform_get_irq(dev, 0);
++ if (wdt->irq < 0) {
++ ret = -ENXIO;
++ goto err_free;
++ }
++ wdt->base = ioremap(res->start, res->end - res->start + 1);
++ if (!wdt->base) {
++ ret = -ENOMEM;
++ goto err_free;
++ }
++
++ cns3xxx_wdt_miscdev.parent = &dev->dev;
++ ret = misc_register(&cns3xxx_wdt_miscdev);
++ if (ret) {
++ dev_printk(KERN_ERR, wdt->dev,
++ "cannot register miscdev on minor=%d (err=%d)\n",
++ WATCHDOG_MINOR, ret);
++ goto err_misc;
++ }
++
++ ret = request_irq(wdt->irq, cns3xxx_wdt_fire, IRQF_DISABLED,
++ dev->name, wdt);
++ if (ret) {
++ dev_printk(KERN_ERR, wdt->dev,
++ "cannot register IRQ%d for watchdog\n", wdt->irq);
++ goto err_irq;
++ }
++
++ cns3xxx_wdt_stop(wdt);
++ platform_set_drvdata(dev, wdt);
++ cns3xxx_wdt_dev = dev;
++
++ return 0;
++
++err_irq:
++ misc_deregister(&cns3xxx_wdt_miscdev);
++err_misc:
++ platform_set_drvdata(dev, NULL);
++ iounmap(wdt->base);
++err_free:
++ kfree(wdt);
++err_out:
++ return ret;
++}
++
++static int __devexit cns3xxx_wdt_remove(struct platform_device *dev)
++{
++ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
++
++ platform_set_drvdata(dev, NULL);
++
++ misc_deregister(&cns3xxx_wdt_miscdev);
++
++ cns3xxx_wdt_dev = NULL;
++
++ free_irq(wdt->irq, wdt);
++ iounmap(wdt->base);
++ kfree(wdt);
++ return 0;
++}
++
++
++static struct platform_driver cns3xxx_wdt_driver = {
++ .probe = cns3xxx_wdt_probe,
++ .remove = __devexit_p(cns3xxx_wdt_remove),
++ .shutdown = cns3xxx_wdt_shutdown,
++ .driver = {
++ .owner = THIS_MODULE,
++ .name = "cns3xxx-wdt",
++ },
++};
++
++static char banner[] __initdata = KERN_INFO
++ "CNS3XXX Watchdog Timer, noboot=%d margin=%d sec (nowayout= %d)\n";
++
++static int __init cns3xxx_wdt_init(void)
++{
++ /*
++ * Check that the margin value is within it's range;
++ * if not reset to the default
++ */
++ if (cns3xxx_wdt_set_heartbeat(cns3xxx_margin)) {
++ cns3xxx_wdt_set_heartbeat(TIMER_MARGIN);
++ printk(KERN_INFO "cns3xxx_margin value must be 0 < cns3xxx_margin < 65536, using %d\n",
++ TIMER_MARGIN);
++ }
++
++ printk(banner, cns3xxx_noboot, cns3xxx_margin, nowayout);
++
++ spin_lock_init(&wdt_lock);
++
++ return platform_driver_register(&cns3xxx_wdt_driver);
++}
++
++static void __exit cns3xxx_wdt_exit(void)
++{
++ platform_driver_unregister(&cns3xxx_wdt_driver);
++}
++
++module_init(cns3xxx_wdt_init);
++module_exit(cns3xxx_wdt_exit);
++
++MODULE_AUTHOR("Scott Shu");
++MODULE_DESCRIPTION("CNS3XXX Watchdog Device Driver");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
++MODULE_ALIAS("platform:cns3xxx-wdt");
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -231,6 +231,15 @@ config DAVINCI_WATCHDOG
+ NOTE: once enabled, this timer cannot be disabled.
+ Say N if you are unsure.
+
++config CNS3XXX_WATCHDOG
++ tristate "CNS3XXX watchdog"
++ depends on ARCH_CNS3XXX && LOCAL_TIMERS
++ help
++ Watchdog timer embedded into the CNS3XXX SoCs system.
++
++ To compile this driver as a module, choose M here: the
++ module will be called cns3xxx_wdt.
++
+ config ORION_WATCHDOG
+ tristate "Orion watchdog"
+ depends on ARCH_ORION5X || ARCH_KIRKWOOD
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -41,6 +41,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_
+ obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
+ obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
+ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
++obj-$(CONFIG_CNS3XXX_WATCHDOG) += cns3xxx_wdt.o
+ obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
+ obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
+ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
projects / openwrt / svn-archive / archive.git / blobdiff