From: Fernando Fuganti <fuganti@conectiva.com.br>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH] ZF MachZ Watchdog driver for 2.4
Date: Fri, 2 Mar 2001 16:15:12 -0300 (EST) [thread overview]
Message-ID: <Pine.LNX.4.21.0103021608160.991-200000@ze.distro.conectiva> (raw)
[-- Attachment #1: Type: TEXT/PLAIN, Size: 209 bytes --]
Hi !
here is the patch against 2.4.2-ac8 of the new watchdog driver
for the embedded MachZ processor made by ZFmicro.
more information on http://cvs.conectiva.com.br/drivers/ZFL-watchdog
Fernando Fuganti
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diff -Nru linux-2.4.2-ac8.orig/Documentation/Configure.help linux-2.4.2-ac8/Documentation/Configure.help
--- linux-2.4.2-ac8.orig/Documentation/Configure.help Fri Mar 2 13:03:25 2001
+++ linux-2.4.2-ac8/Documentation/Configure.help Fri Mar 2 13:09:14 2001
@@ -14007,6 +14007,19 @@
module, say M here and read Documentation/modules.txt. Most people
will say N.
+ZF MachZ Watchdog
+CONFIG_MACHZ_WDT
+ If you are using a ZF Micro MachZ processor, say Y here, otherwise N.
+ This is the driver for the watchdog timer builtin on that processor
+ using ZF-Logic interface. This watchdog simply watches your kernel to
+ make sure it doesn't freeze, and if it does, it reboots your computer
+ after a certain amount of time.
+
+ 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 machzwd.o. If you want to compile it as a module,
+ say M here and read Documentation/modules.txt.
+
Toshiba Laptop support
CONFIG_TOSHIBA
If you intend to run this the kernel on a Toshiba portable say yes
diff -Nru linux-2.4.2-ac8.orig/drivers/char/Config.in linux-2.4.2-ac8/drivers/char/Config.in
--- linux-2.4.2-ac8.orig/drivers/char/Config.in Fri Mar 2 13:03:37 2001
+++ linux-2.4.2-ac8/drivers/char/Config.in Fri Mar 2 13:09:15 2001
@@ -143,6 +143,7 @@
tristate ' NetWinder WB83C977 watchdog' CONFIG_977_WATCHDOG
fi
fi
+ tristate ' ZF MachZ Watchdog' CONFIG_MACHZ_WDT
fi
endmenu
diff -Nru linux-2.4.2-ac8.orig/drivers/char/Makefile linux-2.4.2-ac8/drivers/char/Makefile
--- linux-2.4.2-ac8.orig/drivers/char/Makefile Fri Mar 2 13:03:37 2001
+++ linux-2.4.2-ac8/drivers/char/Makefile Fri Mar 2 13:09:15 2001
@@ -206,6 +206,7 @@
obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
obj-$(CONFIG_I810_TCO) += i810-tco.o
+obj-$(CONFIG_MACHZ_WDT) += machzwd.o
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
diff -Nru linux-2.4.2-ac8.orig/drivers/char/machzwd.c linux-2.4.2-ac8/drivers/char/machzwd.c
--- linux-2.4.2-ac8.orig/drivers/char/machzwd.c Wed Dec 31 21:00:00 1969
+++ linux-2.4.2-ac8/drivers/char/machzwd.c Fri Mar 2 13:09:15 2001
@@ -0,0 +1,545 @@
+/*
+ * MachZ ZF-Logic Watchdog Timer driver for Linux
+ *
+ *
+ * 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.
+ *
+ * The author does NOT admit liability nor provide warranty for
+ * any of this software. This material is provided "AS-IS" in
+ * the hope that it may be useful for others.
+ *
+ * Author: Fernando Fuganti <fuganti@conectiva.com.br>
+ *
+ * Based on sbc60xxwdt.c by Jakob Oestergaard
+ *
+ *
+ * We have two timers (wd#1, wd#2) driven by a 32 KHz clock with the
+ * following periods:
+ * wd#1 - 2 seconds;
+ * wd#2 - 7.2 ms;
+ * After the expiration of wd#1, it can generate a NMI, SCI, SMI, or
+ * a system RESET and it starts wd#2 that unconditionaly will RESET
+ * the system when the counter reaches zero.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/malloc.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+
+
+/* ports */
+#define ZF_IOBASE 0x218
+#define INDEX 0x218
+#define DATA_B 0x219
+#define DATA_W 0x21A
+#define DATA_D 0x21A
+
+/* indexes */ /* size */
+#define ZFL_VERSION 0x02 /* 16 */
+#define CONTROL 0x10 /* 16 */
+#define STATUS 0x12 /* 8 */
+#define COUNTER_1 0x0C /* 16 */
+#define COUNTER_2 0x0E /* 8 */
+#define PULSE_LEN 0x0F /* 8 */
+
+/* controls */
+#define ENABLE_WD1 0x0001
+#define ENABLE_WD2 0x0002
+#define RESET_WD1 0x0010
+#define RESET_WD2 0x0020
+#define GEN_SCI 0x0100
+#define GEN_NMI 0x0200
+#define GEN_SMI 0x0400
+#define GEN_RESET 0x0800
+
+
+/* utilities */
+
+#define WD1 0
+#define WD2 1
+
+#define zf_writew(port, data) { outb(port, INDEX); outw(data, DATA_W); }
+#define zf_writeb(port, data) { outb(port, INDEX); outb(data, DATA_B); }
+#define zf_get_ZFL_version() zf_readw(ZFL_VERSION)
+
+
+static unsigned short zf_readw(unsigned char port)
+{
+ outb(port, INDEX);
+ return inw(DATA_W);
+}
+
+static unsigned short zf_readb(unsigned char port)
+{
+ outb(port, INDEX);
+ return inb(DATA_B);
+}
+
+
+MODULE_AUTHOR("Fernando Fuganti <fuganti@conectiva.com.br>");
+MODULE_DESCRIPTION("MachZ ZF-Logic Watchdog driver");
+MODULE_PARM(action, "i");
+MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*) 1 = SMI 2 = NMI 3 = SCI");
+
+#define PFX "machzwd"
+
+static struct watchdog_info zf_info = {
+ options: WDIOF_KEEPALIVEPING,
+ firmware_version: 1,
+ identity: "ZF-Logic watchdog"
+};
+
+
+/*
+ * action refers to action taken when watchdog resets
+ * 0 = GEN_RESET
+ * 1 = GEN_SMI
+ * 2 = GEN_NMI
+ * 3 = GEN_SCI
+ * defaults to GEN_RESET (0)
+ */
+static int action = 0;
+static int zf_action = GEN_RESET;
+static int zf_is_open = 0;
+static int zf_expect_close = 0;
+static spinlock_t zf_lock;
+static struct timer_list zf_timer;
+static unsigned long next_heartbeat = 0;
+
+
+/* timeout for user land heart beat (10 seconds) */
+#define ZF_USER_TIMEO (HZ*10)
+
+/* timeout for hardware watchdog (~500ms) */
+#define ZF_HW_TIMEO (HZ/2)
+
+/* number of ticks on WD#1 (driven by a 32KHz clock, 2s) */
+#define ZF_CTIMEOUT 0xffff
+
+#ifndef ZF_DEBUG
+# define dprintk(format, args...)
+#else
+# define dprintk(format, args...) printk(KERN_DEBUG PFX ":" __FUNCTION__ ":%d: " format, __LINE__ , ## args)
+#endif
+
+
+/* STATUS register functions */
+
+static inline unsigned char zf_get_status(void)
+{
+ return zf_readb(STATUS);
+}
+
+static inline void zf_set_status(unsigned char new)
+{
+ zf_writeb(STATUS, new);
+}
+
+
+/* CONTROL register functions */
+
+static inline unsigned short zf_get_control(void)
+{
+ return zf_readw(CONTROL);
+}
+
+static inline void zf_set_control(unsigned short new)
+{
+ zf_writew(CONTROL, new);
+}
+
+
+/* WD#? counter functions */
+/*
+ * Just get current counter value
+ */
+
+inline unsigned short zf_get_timer(unsigned char n)
+{
+ switch(n){
+ case WD1:
+ return zf_readw(COUNTER_1);
+ case WD2:
+ return zf_readb(COUNTER_2);
+ default:
+ return 0;
+ }
+}
+
+/*
+ * Just set counter value
+ */
+
+static inline void zf_set_timer(unsigned short new, unsigned char n)
+{
+ switch(n){
+ case WD1:
+ zf_writew(COUNTER_1, new);
+ case WD2:
+ zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
+ default:
+ return;
+ }
+}
+
+/*
+ * stop hardware timer
+ */
+static void zf_timer_off(void)
+{
+ unsigned int ctrl_reg = 0;
+
+ /* stop internal ping */
+ del_timer(&zf_timer);
+
+ /* stop watchdog timer */
+ ctrl_reg = zf_get_control();
+ ctrl_reg |= (ENABLE_WD1|ENABLE_WD2); /* disable wd1 and wd2 */
+ ctrl_reg &= ~(ENABLE_WD1|ENABLE_WD2);
+ zf_set_control(ctrl_reg);
+
+ printk(PFX ": Watchdog timer is now disabled\n");
+}
+
+
+/*
+ * start hardware timer
+ */
+static void zf_timer_on(void)
+{
+ unsigned int ctrl_reg = 0;
+
+ zf_writeb(PULSE_LEN, 0xff);
+
+ zf_set_timer(ZF_CTIMEOUT, WD1);
+
+ /* user land ping */
+ next_heartbeat = jiffies + ZF_USER_TIMEO;
+
+ /* start the timer for internal ping */
+ zf_timer.expires = jiffies + ZF_HW_TIMEO;
+
+ add_timer(&zf_timer);
+
+ /* start watchdog timer */
+ ctrl_reg = zf_get_control();
+ ctrl_reg |= (ENABLE_WD1|zf_action);
+ zf_set_control(ctrl_reg);
+
+ printk(PFX ": Watchdog timer is now enabled\n");
+}
+
+
+static void zf_ping(unsigned long data)
+{
+ unsigned int ctrl_reg = 0;
+
+ zf_writeb(COUNTER_2, 0xff);
+
+ if(time_before(jiffies, next_heartbeat)){
+
+ dprintk("time_before: %ld\n", next_heartbeat - jiffies);
+
+ /*
+ * reset event is activated by transition from 0 to 1 on
+ * RESET_WD1 bit and we assume that it is already zero...
+ */
+ ctrl_reg = zf_get_control();
+ ctrl_reg |= RESET_WD1;
+ zf_set_control(ctrl_reg);
+
+ /* ...and nothing changes until here */
+ ctrl_reg &= ~(RESET_WD1);
+ zf_set_control(ctrl_reg);
+
+ zf_timer.expires = jiffies + ZF_HW_TIMEO;
+ add_timer(&zf_timer);
+ }else{
+ printk(PFX ": I will reset your machine\n");
+ }
+}
+
+static ssize_t zf_write(struct file *file, const char *buf, size_t count,
+ loff_t *ppos)
+{
+ /* Can't seek (pwrite) on this device */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+
+ /* See if we got the magic character */
+ if(count){
+
+/*
+ * no need to check for close confirmation
+ * no way to disable watchdog ;)
+ */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ size_t ofs;
+
+ /*
+ * note: just in case someone wrote the magic character
+ * five months ago...
+ */
+ zf_expect_close = 0;
+
+ /* now scan */
+ for(ofs = 0; ofs != count; ofs++){
+ if(buf[ofs] == 'V'){
+ zf_expect_close = 1;
+ dprintk("zf_expect_close 1\n");
+ }
+ }
+#endif
+ /*
+ * Well, anyhow someone wrote to us,
+ * we should return that favour
+ */
+ next_heartbeat = jiffies + ZF_USER_TIMEO;
+ dprintk("user ping at %ld\n", jiffies);
+
+ return 1;
+ }
+
+ return 0;
+}
+
+static ssize_t zf_read(struct file *file, char *buf, size_t count,
+ loff_t *ppos)
+{
+ return -EINVAL;
+}
+
+
+
+static int zf_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret;
+
+ switch(cmd){
+ case WDIOC_GETSUPPORT:
+ ret = copy_to_user((struct watchdog_info *)arg,
+ &zf_info, sizeof(zf_info));
+ if(ret)
+ return -EFAULT;
+ break;
+
+ case WDIOC_GETSTATUS:
+ ret = copy_to_user((int *)arg, &zf_is_open,
+ sizeof(int));
+ if(ret)
+ return -EFAULT;
+ break;
+
+ case WDIOC_KEEPALIVE:
+ zf_ping(0);
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static int zf_open(struct inode *inode, struct file *file)
+{
+ switch(MINOR(inode->i_rdev)){
+ case WATCHDOG_MINOR:
+ spin_lock(&zf_lock);
+ if(zf_is_open){
+ spin_unlock(&zf_lock);
+ return -EBUSY;
+ }
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ MOD_INC_USE_COUNT;
+#endif
+ zf_is_open = 1;
+
+ spin_unlock(&zf_lock);
+
+ zf_timer_on();
+
+ return 0;
+ default:
+ return -ENODEV;
+ }
+}
+
+static int zf_close(struct inode *inode, struct file *file)
+{
+ if(MINOR(inode->i_rdev) == WATCHDOG_MINOR){
+
+ if(zf_expect_close){
+ zf_timer_off();
+ } else {
+ del_timer(&zf_timer);
+ printk(PFX ": device file closed unexpectedly. Will not stop the WDT!\n");
+ }
+
+ spin_lock(&zf_lock);
+ zf_is_open = 0;
+ spin_unlock(&zf_lock);
+
+ zf_expect_close = 0;
+ }
+
+ return 0;
+}
+
+/*
+ * Notifier for system down
+ */
+
+static int zf_notify_sys(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ if(code == SYS_DOWN || code == SYS_HALT){
+ zf_timer_off();
+ }
+
+ return NOTIFY_DONE;
+}
+
+
+
+
+static struct file_operations zf_fops = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,34)
+ owner: THIS_MODULE,
+#endif
+ read: zf_read,
+ write: zf_write,
+ ioctl: zf_ioctl,
+ open: zf_open,
+ release: zf_close,
+};
+
+static struct miscdevice zf_miscdev = {
+ WATCHDOG_MINOR,
+ "watchdog",
+ &zf_fops
+};
+
+
+/*
+ * The device needs to learn about soft shutdowns in order to
+ * turn the timebomb registers off.
+ */
+static struct notifier_block zf_notifier = {
+ zf_notify_sys,
+ NULL,
+ 0
+};
+
+static void __init zf_show_action(int act)
+{
+ char *str[] = { "RESET", "SMI", "NMI", "SCI" };
+
+ printk(PFX ": Watchdog using action = %s\n", str[act]);
+}
+
+int __init zf_init(void)
+{
+ int ret;
+
+ printk(PFX ": MachZ ZF-Logic Watchdog driver initializing.\n");
+
+ ret = zf_get_ZFL_version();
+ printk("%#x\n", ret);
+ if((!ret) || (ret != 0xffff)){
+ printk(PFX ": no ZF-Logic found\n");
+ return -ENODEV;
+ }
+
+ if((action <= 3) && (action >= 0)){
+ zf_action = zf_action>>action;
+ } else
+ action = 0;
+
+ zf_show_action(action);
+
+ spin_lock_init(&zf_lock);
+
+ ret = misc_register(&zf_miscdev);
+ if (ret){
+ printk(KERN_ERR "can't misc_register on minor=%d\n",
+ WATCHDOG_MINOR);
+ goto out;
+ }
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,3)
+ if(check_region(ZF_IOBASE, 3)){
+#else
+ if(!request_region(ZF_IOBASE, 3, "MachZ ZFL WDT")){
+#endif
+
+ printk(KERN_ERR "cannot reserve I/O ports at %d\n",
+ ZF_IOBASE);
+ ret = -EBUSY;
+ goto no_region;
+ }
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,3)
+ request_region(ZF_IOBASE, 3, "MachZ ZFL WDT");
+#define __exit
+#endif
+
+ ret = register_reboot_notifier(&zf_notifier);
+ if(ret){
+ printk(KERN_ERR "can't register reboot notifier (err=%d)\n",
+ ret);
+ goto no_reboot;
+ }
+
+ zf_set_status(0);
+ zf_set_control(0);
+
+ /* this is the timer that will do the hard work */
+ init_timer(&zf_timer);
+ zf_timer.function = zf_ping;
+ zf_timer.data = 0;
+
+ return 0;
+
+no_reboot:
+ release_region(ZF_IOBASE, 3);
+no_region:
+ misc_deregister(&zf_miscdev);
+out:
+ return ret;
+}
+
+
+void __exit zf_exit(void)
+{
+ zf_timer_off();
+
+ misc_deregister(&zf_miscdev);
+ unregister_reboot_notifier(&zf_notifier);
+ release_region(ZF_IOBASE, 3);
+}
+
+module_init(zf_init);
+module_exit(zf_exit);
reply other threads:[~2001-03-02 18:13 UTC|newest]
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