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Subject[PATCH][DRIVER][RFC] CPU5 watchdog driver for 2.5
Hello linux-kernel,

this patch is for CPU5 watchdog hardware (kernel 2.5.59)

see: http://www.sma.de/en/inco/dokuftp/

I would appreciate if you could find the time to have a
look at the code and send a feedback.

Heiko

diff -urN linux-vanilla/drivers/char/watchdog/Kconfig linux-patched/drivers/char/watchdog/Kconfig
--- linux-vanilla/drivers/char/watchdog/Kconfig Fri Feb 7 20:45:30 2003
+++ linux-patched/drivers/char/watchdog/Kconfig Fri Feb 7 20:52:40 2003
@@ -316,4 +316,14 @@
tristate "ICP Wafer 5823 Single Board Computer Watchdog"
depends on WATCHDOG

+config CPU5_WDT
+ tristate "SMA CPU5 Watchdog"
+ depends on WATCHDOG
+ ---help---
+ TBD.
+ This driver is also available as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want).
+ The module is called cpu5wdt.o. If you want to compile it as a
+ module, say M here and read <file:Documentation/modules.txt>.
+
endmenu
diff -urN linux-vanilla/drivers/char/watchdog/Makefile linux-patched/drivers/char/watchdog/Makefile
--- linux-vanilla/drivers/char/watchdog/Makefile Fri Feb 7 20:45:30 2003
+++ linux-patched/drivers/char/watchdog/Makefile Fri Feb 7 20:52:40 2003
@@ -29,3 +29,4 @@
obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
+obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
diff -urN linux-vanilla/drivers/char/watchdog/cpu5wdt.c linux-patched/drivers/char/watchdog/cpu5wdt.c
--- linux-vanilla/drivers/char/watchdog/cpu5wdt.c Thu Jan 1 01:00:00 1970
+++ linux-patched/drivers/char/watchdog/cpu5wdt.c Mon Feb 10 20:38:14 2003
@@ -0,0 +1,312 @@
+/*
+ * sma cpu5 watchdog driver
+ *
+ * Copyright (C) 2003 Heiko Ronsdorf <hero@ihg.uni-duisburg.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <linux/watchdog.h>
+
+/* adjustable parameters */
+
+static int verbose = 0;
+static int port = 0x91;
+static volatile int ticks = 10000;
+
+#define PFX "cpu5wdt: "
+
+#define CPU5WDT_EXTENT 0x0A
+
+#define CPU5WDT_STATUS_REG 0x00
+#define CPU5WDT_TIME_A_REG 0x02
+#define CPU5WDT_TIME_B_REG 0x03
+#define CPU5WDT_MODE_REG 0x04
+#define CPU5WDT_TRIGGER_REG 0x07
+#define CPU5WDT_ENABLE_REG 0x08
+#define CPU5WDT_RESET_REG 0x09
+
+#define CPU5WDT_INTERVAL (HZ/10+1)
+
+/* some device data */
+
+static struct {
+ struct semaphore stop;
+ volatile int running;
+ struct timer_list timer;
+ volatile int queue;
+ int default_ticks;
+ int min_ticks;
+ unsigned long inuse;
+} cpu5wdt_device;
+
+/* generic helper functions */
+
+static void cpu5wdt_trigger(unsigned long unused) {
+
+ if ( verbose > 2 )
+ printk(KERN_DEBUG PFX "trigger at %i ticks\n", ticks);
+
+ if( cpu5wdt_device.running )
+ ticks--;
+
+ /* keep watchdog alive */
+ outb(1, port + CPU5WDT_TRIGGER_REG);
+
+ /* requeue?? */
+ if( cpu5wdt_device.queue && ticks ) {
+ cpu5wdt_device.timer.expires = jiffies + CPU5WDT_INTERVAL;
+ add_timer(&cpu5wdt_device.timer);
+ }
+ else {
+ /* ticks doesn't matter anyway */
+ up(&cpu5wdt_device.stop);
+ }
+
+}
+
+static void cpu5wdt_reset(void) {
+
+ if ( ticks < cpu5wdt_device.min_ticks )
+ cpu5wdt_device.min_ticks = ticks;
+
+ ticks = cpu5wdt_device.default_ticks;
+
+ if ( verbose )
+ printk(KERN_DEBUG PFX "reset (%i ticks)\n", (int) ticks);
+
+}
+
+#ifdef CONFIG_PROC_FS
+static int cpu5wdt_read_proc(char *buf, char **start, off_t offset, int len) {
+ len = sprintf(buf, "activation: %i\n", cpu5wdt_device.queue);
+ len += sprintf(buf+len, "status: %i\n", cpu5wdt_device.running);
+ len += sprintf(buf+len, "current ticks: %i\n", ticks);
+ len += sprintf(buf+len, "min ticks: %i\n", cpu5wdt_device.min_ticks);
+ return len;
+}
+
+static inline void cpu5wdt_register_proc(void) {
+ create_proc_info_entry("driver/cpu5wdt", 0, NULL, cpu5wdt_read_proc);
+}
+
+static inline void cpu5wdt_unregister_proc(void) {
+ remove_proc_entry("driver/cpu5wdt", NULL);
+}
+#else
+static inline void cpu5wdt_register_proc(void) {}
+static inline void cpu5wdt_unregister_proc(void) {}
+#endif
+
+/* filesystem operations */
+
+static int cpu5wdt_open(struct inode *inode, struct file *file) {
+
+ switch(minor(inode->i_rdev)) {
+ case WATCHDOG_MINOR:
+ if ( test_and_set_bit(0, &cpu5wdt_device.inuse) )
+ return -EBUSY;
+ break;
+ default:
+ return -ENODEV;
+ }
+ return 0;
+
+}
+
+static int cpu5wdt_release(struct inode *inode, struct file *file) {
+
+ if(minor(inode->i_rdev)==WATCHDOG_MINOR) {
+ clear_bit(0, &cpu5wdt_device.inuse);
+ }
+ return 0;
+}
+
+static int cpu5wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) {
+ unsigned int value;
+
+ switch(cmd) {
+ case WDIOC_KEEPALIVE:
+ cpu5wdt_reset();
+ break;
+ case WDIOC_START:
+ if ( !cpu5wdt_device.queue ) {
+ cpu5wdt_device.queue = 1;
+ outb(0, port + CPU5WDT_TIME_A_REG);
+ outb(0, port + CPU5WDT_TIME_B_REG);
+ outb(1, port + CPU5WDT_MODE_REG);
+ outb(0, port + CPU5WDT_RESET_REG);
+ outb(0, port + CPU5WDT_ENABLE_REG);
+ cpu5wdt_device.timer.expires = jiffies + CPU5WDT_INTERVAL;
+ add_timer(&cpu5wdt_device.timer);
+ }
+ /* if process dies, counter is not decremented */
+ cpu5wdt_device.running++;
+ break;
+ case WDIOC_GETSTATUS:
+ value = inb(port + CPU5WDT_STATUS_REG);
+ value = (value >> 2) & 1;
+ if ( copy_to_user((int *)arg, (int *)&value, sizeof(int)) )
+ return -EFAULT;
+ break;
+ case WDIOC_STOP:
+ if ( cpu5wdt_device.running )
+ cpu5wdt_device.running = 0;
+
+ ticks = cpu5wdt_device.default_ticks;
+
+ if ( verbose )
+ printk(KERN_CRIT PFX "stop not possible\n");
+ return -EIO;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static ssize_t cpu5wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos) {
+
+ if ( !count )
+ return -EIO;
+
+ cpu5wdt_reset();
+ return count;
+
+}
+
+static struct file_operations cpu5wdt_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = cpu5wdt_ioctl,
+ .open = cpu5wdt_open,
+ .write = cpu5wdt_write,
+ .release = cpu5wdt_release,
+};
+
+static struct miscdevice cpu5wdt_misc = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &cpu5wdt_fops
+};
+
+/* init/exit function */
+
+static int __devinit cpu5wdt_init(void) {
+ unsigned int val;
+ int err;
+
+ if ( verbose )
+ printk(KERN_DEBUG PFX "port=0x%x, verbose=%i\n", port, verbose);
+
+ if ( (err = misc_register(&cpu5wdt_misc)) < 0 ) {
+ printk(KERN_ERR PFX "misc_register failed\n");
+ goto no_misc;
+ }
+
+ if ( !request_region(port, CPU5WDT_EXTENT, PFX) ) {
+ printk(KERN_ERR PFX "request_region failed\n");
+ err = -EBUSY;
+ goto no_port;
+ }
+
+ /* watchdog reboot? */
+ val = inb(port + CPU5WDT_STATUS_REG);
+ val = (val >> 2) & 1;
+ if ( !val )
+ printk(KERN_INFO PFX "sorry, was my fault\n");
+
+ init_MUTEX_LOCKED(&cpu5wdt_device.stop);
+ cpu5wdt_device.queue = 0;
+ cpu5wdt_device.min_ticks = ticks;
+
+ clear_bit(0, &cpu5wdt_device.inuse);
+
+ cpu5wdt_register_proc();
+
+ init_timer(&cpu5wdt_device.timer);
+ cpu5wdt_device.timer.function = cpu5wdt_trigger;
+ cpu5wdt_device.timer.data = 0;
+
+ cpu5wdt_device.default_ticks = ticks;
+
+ printk(KERN_INFO PFX "init success\n");
+
+ return 0;
+
+no_port:
+ misc_deregister(&cpu5wdt_misc);
+no_misc:
+ return err;
+}
+
+static int __devinit cpu5wdt_init_module(void) {
+
+ return cpu5wdt_init();
+}
+
+static void __devexit cpu5wdt_exit(void) {
+
+ if ( cpu5wdt_device.queue ) {
+ cpu5wdt_device.queue = 0;
+ down(&cpu5wdt_device.stop);
+ }
+
+ cpu5wdt_unregister_proc();
+
+ misc_deregister(&cpu5wdt_misc);
+
+ release_region(port, CPU5WDT_EXTENT);
+
+}
+
+static void __devexit cpu5wdt_exit_module(void) {
+
+ cpu5wdt_exit();
+}
+
+/* module entry points */
+
+module_init(cpu5wdt_init_module);
+module_exit(cpu5wdt_exit_module);
+
+MODULE_AUTHOR("Heiko Ronsdorf <hero@ihg.uni-duisburg.de>");
+MODULE_DESCRIPTION("sma cpu5 watchdog driver");
+MODULE_SUPPORTED_DEVICE("sma cpu5 watchdog");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM(port, "i");
+MODULE_PARM_DESC(port, "base address of watchdog card, default is 0x91");
+
+MODULE_PARM(verbose, "i");
+MODULE_PARM_DESC(verbose, "be verbose, default is 0 (no)");
+
+MODULE_PARM(ticks, "i");
+MODULE_PARM_DESC(ticks, "count down ticks, default is 10000");
+
+EXPORT_NO_SYMBOLS;
diff -urN linux-vanilla/include/linux/watchdog.h linux-patched/include/linux/watchdog.h
--- linux-vanilla/include/linux/watchdog.h Fri Jan 10 22:08:18 2003
+++ linux-patched/include/linux/watchdog.h Fri Feb 7 20:52:40 2003
@@ -27,6 +27,8 @@
#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int)
+#define WDIOC_START _IO(WATCHDOG_IOCTL_BASE, 8)
+#define WDIOC_STOP _IO(WATCHDOG_IOCTL_BASE, 9)

#define WDIOF_UNKNOWN -1 /* Unknown flag error */
#define WDIOS_UNKNOWN -1 /* Unknown status error */
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