mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 15:02:32 +00:00
497 lines
12 KiB
Diff
497 lines
12 KiB
Diff
--- /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
|