diff options
Diffstat (limited to 'target/linux/au1000-2.6')
| -rw-r--r-- | target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c | 280 | ||||
| -rw-r--r-- | target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch | 251 |
2 files changed, 280 insertions, 251 deletions
diff --git a/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c b/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c new file mode 100644 index 0000000..ccd631e --- /dev/null +++ b/target/linux/au1000-2.6/files/drivers/char/watchdog/mtx-1_watchdog.c @@ -0,0 +1,280 @@ +/* + * Driver for the MTX-1 Watchdog. + * + * (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved. + * http://www.4g-systems.biz + * + * (C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Michael Stickel nor 4G Systems admit liability nor provide + * warranty for any of this software. This material is provided + * "AS-IS" and at no charge. + * + * (c) Copyright 2005 4G Systems <info@4g-systems.biz> + * + * Release 0.01. + * + * Author: Michael Stickel michael.stickel@4g-systems.biz + * + * Release 0.02. + * Author: Florian Fainelli florian@openwrt.org + * use the Linux watchdog API + * + * The Watchdog is configured to reset the MTX-1 + * if it is not triggered for 100 seconds. + * It should not be triggered more often than 1.6 seconds. + * + * A timer triggers the watchdog every 5 seconds, until + * it is opened for the first time. After the first open + * it MUST be triggered every 2..95 seconds. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/miscdevice.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/timer.h> +#include <linux/completion.h> +#include <linux/jiffies.h> +#include <linux/watchdog.h> +#include <asm/io.h> +#include <asm/uaccess.h> + +#include <asm/mach-au1x00/au1000.h> + +#define MTX1_WDT_INTERVAL (5 * HZ) + +static int ticks = 100 * HZ; + +static struct { + struct completion stop; + volatile int running; + struct timer_list timer; + volatile int queue; + int default_ticks; + unsigned long inuse; +} mtx1_wdt_device; + +static void mtx1_wdt_trigger(unsigned long unused) +{ + u32 tmp; + + if (mtx1_wdt_device.running) + ticks--; + /* + * toggle GPIO2_15 + */ + tmp = au_readl(GPIO2_DIR); + tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15)); + au_writel (tmp, GPIO2_DIR); + + if (mtx1_wdt_device.queue && ticks) + mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL); + else { + complete(&mtx1_wdt_device.stop); + } +} + +static void mtx1_wdt_reset(void) +{ + ticks = mtx1_wdt_device.default_ticks; +} + + +static void mtx1_wdt_start(void) +{ + if (!mtx1_wdt_device.queue) { + mtx1_wdt_device.queue = 1; + au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR); + mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL); + } + mtx1_wdt_device.running++; +} + +static int mtx1_wdt_stop(void) +{ + if (mtx1_wdt_device.queue) { + mtx1_wdt_device.queue = 0; + au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR); + } + + ticks = mtx1_wdt_device.default_ticks; + + return 0; +} + +/* Filesystem functions */ + +static char restart_after_close; + +static int mtx1_wdt_open(struct inode *inode, struct file *file) +{ + if (test_and_set_bit(0, &mtx1_wdt_device.inuse)) + return -EBUSY; + + return nonseekable_open(inode, file); +} + + +static int mtx1_wdt_release(struct inode *inode, struct file *file) +{ + clear_bit(0, &mtx1_wdt_device.inuse); + return 0; +} + +static int mtx1_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + unsigned int value; + static struct watchdog_info ident = + { + .options = WDIOF_CARDRESET, + .identity = "MTX-1 WDT", + }; + + switch(cmd) { + case WDIOC_KEEPALIVE: + mtx1_wdt_reset(); + break; + case WDIOC_GETSTATUS: + if ( copy_to_user(argp, &value, sizeof(int)) ) + return -EFAULT; + break; + case WDIOC_GETSUPPORT: + if ( copy_to_user(argp, &ident, sizeof(ident)) ) + return -EFAULT; + break; + case WDIOC_SETOPTIONS: + if ( copy_from_user(&value, argp, sizeof(int)) ) + return -EFAULT; + switch(value) { + case WDIOS_ENABLECARD: + mtx1_wdt_start(); + break; + case WDIOS_DISABLECARD: + return mtx1_wdt_stop(); + default: + return -EINVAL; + } + break; + default: + return -ENOTTY; + } + return 0; +} + + +static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos) +{ + if (!count) + return -EIO; + + mtx1_wdt_reset(); + + if (count > 0) { + char buffer[10]; + int n = (count>9)?9:count; + + if (copy_from_user (&buffer, buf, n)) + return -EFAULT; + buffer[n]=0; + + if (count >= 4 && strncmp("auto", buffer, 4)==0) + restart_after_close = 1; + + else if (count >= 6 && strncmp("manual", buffer, 6)==0) + restart_after_close = 0; + + return n; + } + return count; +} + +#if 0 +static ssize_t mtx1_wdt_read (struct file *file, char *buf, size_t count, loff_t *ppos) +{ + char * state = restart_after_close ? "auto\n" : "manual\n"; + int n = strlen(state)+1; + + if (file->f_pos >= n) + return 0; + + if (count < n) + return -EINVAL; + + if(copy_to_user(buf, state, n)) + return -EFAULT; + + file->f_pos += n; + + return n; +} +#endif + +static struct file_operations mtx1_wdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .ioctl = mtx1_wdt_ioctl, + .open = mtx1_wdt_open, + .write = mtx1_wdt_write, + //.read = mtx1_wdt_read, + .release = mtx1_wdt_release +}; + + +static struct miscdevice mtx1_wdt_misc = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &mtx1_wdt_fops +}; + + +static int __init mtx1_wdt_init(void) +{ + int ret; + + if ((ret = misc_register(&mtx1_wdt_misc)) < 0) { + printk(KERN_ERR " mtx-1_wdt : failed to register\n"); + return ret; + } + + init_completion(&mtx1_wdt_device.stop); + mtx1_wdt_device.queue = 0; + + clear_bit(0, &mtx1_wdt_device.inuse); + + setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L); + + mtx1_wdt_device.default_ticks = ticks; + + mtx1_wdt_start(); + + printk(KERN_INFO "MTX-1 Watchdog driver\n"); + + return 0; +} + +static void __exit mtx1_wdt_exit(void) +{ + if (mtx1_wdt_device.queue) { + mtx1_wdt_device.queue = 0; + wait_for_completion(&mtx1_wdt_device.stop); + } + misc_deregister(&mtx1_wdt_misc); +} + +module_init(mtx1_wdt_init); +module_exit(mtx1_wdt_exit); + +MODULE_AUTHOR("Michael Stickel, Florian Fainelli"); +MODULE_DESCRIPTION("Driver for the MTX-1 watchdog"); +MODULE_LICENSE("GPL"); diff --git a/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch b/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch index d3b7c32..273de9f 100644 --- a/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch +++ b/target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch @@ -26,254 +26,3 @@ diff -urN linux-2.6.16.7/drivers/char/watchdog/Makefile linux-2.6.16.7.new/drive +obj-$(CONFIG_MTX1_WATCHDOG) += mtx-1_watchdog.o # S390 Architecture - -diff -urN linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c ---- linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c 2006-04-22 23:20:53.000000000 +0200 -@@ -0,0 +1,246 @@ -+/* -+ * Driver for the MTX-1 Watchdog. -+ * -+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved. -+ * http://www.4g-systems.biz -+ * -+ * This program is free software; you can redistribute it and/or -+ * modify it under the terms of the GNU General Public License -+ * as published by the Free Software Foundation; either version -+ * 2 of the License, or (at your option) any later version. -+ * -+ * Neither Michael Stickel nor 4G Systems admit liability nor provide -+ * warranty for any of this software. This material is provided -+ * "AS-IS" and at no charge. -+ * -+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz> -+ * -+ * Release 0.01. -+ * -+ * Author: Michael Stickel michael.stickel@4g-systems.biz -+ * -+ * -+ * The Watchdog is configured to reset the MTX-1 -+ * if it is not triggered for 100 seconds. -+ * It should not be triggered more often than 1.6 seconds. -+ * -+ * A timer triggers the watchdog every 5 seconds, until -+ * it is opened for the first time. After the first open -+ * it MUST be triggered every 2..95 seconds. -+ */ -+#include <linux/autoconf.h> -+#include <linux/module.h> -+#include <linux/version.h> -+#include <linux/types.h> -+#include <linux/errno.h> -+#include <linux/kernel.h> -+#include <linux/sched.h> -+#include <linux/miscdevice.h> -+#include <linux/watchdog.h> -+#include <linux/slab.h> -+#include <linux/init.h> -+#include <asm/uaccess.h> -+#include <linux/fs.h> -+ -+#include <asm/mach-au1x00/au1000.h> -+ -+#ifndef FALSE -+# define FALSE (0) -+#endif -+ -+#ifndef TRUE -+# define TRUE (!FALSE) -+#endif -+ -+ -+//---------[ Hardware Functions ]----------------- -+ -+static void mtx1_trigger_wd (void) -+{ -+ /* -+ * toggle GPIO2_15 -+ */ -+ -+ u32 tmp = au_readl(GPIO2_DIR); -+ tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15)); -+ au_writel (tmp, GPIO2_DIR); -+} -+ -+static void mtx1_enable_wd (void) -+{ -+ au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR); -+} -+ -+static void mtx1_disable_wd (void) -+{ -+ au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR); -+} -+ -+ -+//---------[ Timer Functions ]----------------- -+ -+static struct timer_list wd_trigger_timer; -+static char timer_is_running = FALSE; -+ -+static void wd_timer_callback (unsigned long data) -+{ -+ if (timer_is_running) -+ mod_timer (&wd_trigger_timer, jiffies + 5 * HZ); -+ mtx1_trigger_wd(); -+} -+ -+static void start_wd_timer (void) -+{ -+ if (!timer_is_running) { -+ struct timer_list *t = &wd_trigger_timer; -+ -+ init_timer (t); -+ t->function = wd_timer_callback; -+ t->data = (unsigned long)0L; -+ t->expires = jiffies + 5 * HZ; // 5 seconds. -+ add_timer (t); -+ timer_is_running = TRUE; -+ } -+} -+ -+ -+ -+static void stop_wd_timer (void) -+{ -+ if (timer_is_running) { -+ del_timer(&wd_trigger_timer); -+ timer_is_running = FALSE; -+ } -+} -+ -+ -+//---------[ File Functions ]----------------- -+ -+static char restart_after_close; -+ -+static int mtx1wd_open (struct inode *inode, struct file *file) -+{ -+ if (MINOR(inode->i_rdev) != WATCHDOG_MINOR) return -ENODEV; -+ //MOD_INC_USE_COUNT; -+ -+ // stop the timer, if it is running. It will not be -+ // started again, until the module is loaded again. -+ stop_wd_timer(); -+ -+ // sleep for 2 seconds, to ensure, that the wd is -+ // not triggered more often than every 2 seconds. -+ schedule_timeout (2 * HZ); -+ -+ return 0; -+} -+ -+ -+static int mtx1wd_release (struct inode *inode, struct file *file) { -+ if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) { -+ } -+ if (restart_after_close) -+ start_wd_timer(); -+ //MOD_DEC_USE_COUNT; -+ return 0; -+} -+ -+ -+static ssize_t mtx1wd_write (struct file *file, const char *buf, size_t count, loff_t *ppos) { -+ -+ mtx1_trigger_wd (); -+ -+ if (count > 0) { -+ char buffer[10]; -+ int n = (count>9)?9:count; -+ -+ if (copy_from_user (&buffer, buf, n)) -+ return -EFAULT; -+ buffer[n]=0; -+ -+ if (count >= 4 && strncmp("auto", buffer, 4)==0) -+ restart_after_close = 1; -+ -+ else if (count >= 6 && strncmp("manual", buffer, 6)==0) -+ restart_after_close = 0; -+ -+ return n; -+ } -+ -+ return 0; -+} -+ -+static ssize_t mtx1wd_read (struct file *file, char *buf, size_t count, loff_t *ppos) -+{ -+ char * state = restart_after_close ? "auto\n" : "manual\n"; -+ int n = strlen(state)+1; -+ -+ if (file->f_pos >= n) -+ return 0; -+ -+ if (count < n) -+ return -EINVAL; -+ -+ if(copy_to_user(buf, state, n)) -+ return -EFAULT; -+ -+ file->f_pos += n; -+ -+ return n; -+} -+ -+static struct file_operations mtx1wd_fops = { -+ .owner = THIS_MODULE, -+ .read = mtx1wd_read, -+ .write = mtx1wd_write, -+ .open = mtx1wd_open, -+ .release = mtx1wd_release -+}; -+ -+ -+static struct miscdevice mtx1wd_miscdev = { -+ WATCHDOG_MINOR, -+ "watchdog", -+ &mtx1wd_fops -+}; -+ -+ -+ -+//---------[ Module Functions ]----------------- -+ -+ -+static int __init init_mtx1_watchdog(void) -+{ -+ printk("MTX-1 watchdog driver\n"); -+ -+ misc_register(&mtx1wd_miscdev); -+ -+ restart_after_close = 0; -+ -+ mtx1_enable_wd (); -+ -+ //-- trigger it for the first time. -+ //-- We do not exactly know how long it has not been triggered. -+ mtx1_trigger_wd (); -+ -+ // start a timer, that calls mtx1_trigger_wd every 5 seconds. -+ start_wd_timer(); -+ -+ return 0; -+} -+ -+static void __exit exit_mtx1_watchdog(void) { -+ -+ // stop the timer, if it is running. -+ stop_wd_timer(); -+ -+ misc_deregister(&mtx1wd_miscdev); -+ -+ mtx1_disable_wd(); -+} -+ -+module_init(init_mtx1_watchdog); -+module_exit(exit_mtx1_watchdog); -+ -+MODULE_AUTHOR("Michael Stickel"); -+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog"); -+MODULE_LICENSE("GPL"); |