Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 10 Feb 2003 15:08:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 10 Feb 2003 15:08:30 -0500 Received: from crimson.ihg.uni-duisburg.de ([134.91.82.10]:28330 "EHLO crimson.ihg.uni-duisburg.de") by vger.kernel.org with ESMTP id ; Mon, 10 Feb 2003 15:08:08 -0500 Date: Mon, 10 Feb 2003 21:17:32 +0100 From: Heiko Ronsdorf To: linux-kernel@vger.kernel.org Subject: [PATCH][DRIVER][RFC] CPU5 watchdog driver for 2.5 Message-ID: <20030210201732.GA25722@mail.ihg.uni-duisburg.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="17pEHd4RhPHOinZp" Content-Disposition: inline User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10478 Lines: 382 --17pEHd4RhPHOinZp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 --17pEHd4RhPHOinZp Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="cpu5wdt.diff" 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 . + 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/* 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 "); +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 */ --17pEHd4RhPHOinZp-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/