target/linux/au1000-2.6/patches/004-mtx1_watchdog.patch

   1 diff -urN linux-2.6.16.7/drivers/char/watchdog/Kconfig linux-2.6.16.7.new/drivers/char/watchdog/Kconfig
   2 --- linux-2.6.16.7/drivers/char/watchdog/Kconfig        2006-04-17 23:53:25.000000000 +0200
   3 +++ linux-2.6.16.7.new/drivers/char/watchdog/Kconfig    2006-04-22 23:23:53.000000000 +0200
   4 @@ -460,6 +460,14 @@
   5           timer expired and no process has written to /dev/watchdog during
   6           that time.
   7
   8 +config MTX1_WATCHDOG
   9 +       tristate "MTX-1 Hardware Watchdog"
  10 +       depends on WATCHDOG && MIPS_MTX1
  11 +       help
  12 +         Hardware driver for the AccessCube MTX-1 watchdog. This is a
  13 +         watchdog timer that will reboot the machine after a 100 seconds
  14 +         timer expired.
  15 +
  16  # S390 Architecture
  17
  18  config ZVM_WATCHDOG
  19 diff -urN linux-2.6.16.7/drivers/char/watchdog/Makefile linux-2.6.16.7.new/drivers/char/watchdog/Makefile
  20 --- linux-2.6.16.7/drivers/char/watchdog/Makefile       2006-04-17 23:53:25.000000000 +0200
  21 +++ linux-2.6.16.7.new/drivers/char/watchdog/Makefile   2006-04-22 23:21:18.000000000 +0200
  22 @@ -65,6 +65,7 @@
  23
  24  # MIPS Architecture
  25  obj-$(CONFIG_INDYDOG) += indydog.o
  26 +obj-$(CONFIG_MTX1_WATCHDOG) += mtx-1_watchdog.o
  27
  28  # S390 Architecture
  29
  30 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
  31 --- linux-2.6.16.7/drivers/char/watchdog/mtx-1_watchdog.c       1970-01-01 01:00:00.000000000 +0100
  32 +++ linux-2.6.16.7.new/drivers/char/watchdog/mtx-1_watchdog.c   2006-04-22 23:20:53.000000000 +0200
  33 @@ -0,0 +1,246 @@
  34 +/*
  35 + *      Driver for the MTX-1 Watchdog.
  36 + *
  37 + *      (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
  38 + *                              http://www.4g-systems.biz
  39 + *
  40 + *      This program is free software; you can redistribute it and/or
  41 + *      modify it under the terms of the GNU General Public License
  42 + *      as published by the Free Software Foundation; either version
  43 + *      2 of the License, or (at your option) any later version.
  44 + *
  45 + *      Neither Michael Stickel nor 4G Systems admit liability nor provide
  46 + *      warranty for any of this software. This material is provided
  47 + *      "AS-IS" and at no charge.
  48 + *
  49 + *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
  50 + *
  51 + *      Release 0.01.
  52 + *
  53 + *      Author: Michael Stickel  michael.stickel@4g-systems.biz
  54 + *
  55 + *
  56 + *      The Watchdog is configured to reset the MTX-1
  57 + *      if it is not triggered for 100 seconds.
  58 + *      It should not be triggered more often than 1.6 seconds.
  59 + *
  60 + *      A timer triggers the watchdog every 5 seconds, until
  61 + *      it is opened for the first time. After the first open
  62 + *      it MUST be triggered every 2..95 seconds.
  63 + */
  64 +#include <linux/autoconf.h>
  65 +#include <linux/module.h>
  66 +#include <linux/version.h>
  67 +#include <linux/types.h>
  68 +#include <linux/errno.h>
  69 +#include <linux/kernel.h>
  70 +#include <linux/sched.h>
  71 +#include <linux/miscdevice.h>
  72 +#include <linux/watchdog.h>
  73 +#include <linux/slab.h>
  74 +#include <linux/init.h>
  75 +#include <asm/uaccess.h>
  76 +#include <linux/fs.h>
  77 +
  78 +#include <asm/mach-au1x00/au1000.h>
  79 +
  80 +#ifndef FALSE
  81 +# define FALSE (0)
  82 +#endif
  83 +
  84 +#ifndef TRUE
  85 +# define TRUE (!FALSE)
  86 +#endif
  87 +
  88 +
  89 +//---------[ Hardware Functions ]-----------------
  90 +
  91 +static void mtx1_trigger_wd (void)
  92 +{
  93 +       /*
  94 +        * toggle GPIO2_15
  95 +        */
  96 +
  97 +       u32 tmp = au_readl(GPIO2_DIR);
  98 +       tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
  99 +       au_writel (tmp, GPIO2_DIR);
 100 +}
 101 +
 102 +static void mtx1_enable_wd (void)
 103 +{
 104 +       au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
 105 +}
 106 +
 107 +static void mtx1_disable_wd (void)
 108 +{
 109 +       au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
 110 +}
 111 +
 112 +
 113 +//---------[ Timer Functions ]-----------------
 114 +
 115 +static struct timer_list   wd_trigger_timer;
 116 +static char                timer_is_running = FALSE;
 117 +
 118 +static void wd_timer_callback (unsigned long data)
 119 +{
 120 +       if (timer_is_running)
 121 +               mod_timer (&wd_trigger_timer, jiffies + 5 * HZ);
 122 +       mtx1_trigger_wd();
 123 +}
 124 +
 125 +static void start_wd_timer (void)
 126 +{
 127 +       if (!timer_is_running) {
 128 +               struct timer_list *t = &wd_trigger_timer;
 129 +
 130 +               init_timer (t);
 131 +               t->function = wd_timer_callback;
 132 +               t->data     = (unsigned long)0L;
 133 +               t->expires  = jiffies + 5 * HZ;   // 5 seconds.
 134 +               add_timer (t);
 135 +               timer_is_running = TRUE;
 136 +       }
 137 +}
 138 +
 139 +
 140 +
 141 +static void stop_wd_timer (void)
 142 +{
 143 +       if (timer_is_running) {
 144 +               del_timer(&wd_trigger_timer);
 145 +               timer_is_running = FALSE;
 146 +       }
 147 +}
 148 +
 149 +
 150 +//---------[ File Functions ]-----------------
 151 +
 152 +static char restart_after_close;
 153 +
 154 +static int mtx1wd_open (struct inode *inode, struct file *file)
 155 +{
 156 +       if (MINOR(inode->i_rdev) != WATCHDOG_MINOR) return -ENODEV;
 157 +       //MOD_INC_USE_COUNT;
 158 +
 159 +       // stop the timer, if it is running. It will not be
 160 +       // started again, until the module is loaded again.
 161 +       stop_wd_timer();
 162 +
 163 +       // sleep for 2 seconds, to ensure, that the wd is
 164 +       // not triggered more often than every 2 seconds.
 165 +       schedule_timeout (2 * HZ);
 166 +
 167 +       return 0;
 168 +}
 169 +
 170 +
 171 +static int mtx1wd_release (struct inode *inode, struct file *file) {
 172 +       if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) {
 173 +       }
 174 +       if (restart_after_close)
 175 +               start_wd_timer();
 176 +       //MOD_DEC_USE_COUNT;
 177 +       return 0;
 178 +}
 179 +
 180 +
 181 +static ssize_t mtx1wd_write (struct file *file, const char *buf, size_t count, loff_t *ppos) {
 182 +
 183 +       mtx1_trigger_wd ();
 184 +
 185 +       if (count > 0) {
 186 +               char buffer[10];
 187 +               int n = (count>9)?9:count;
 188 +
 189 +               if (copy_from_user (&buffer, buf, n))
 190 +                       return -EFAULT;
 191 +               buffer[n]=0;
 192 +
 193 +               if (count >= 4 && strncmp("auto", buffer, 4)==0)
 194 +                       restart_after_close = 1;
 195 +
 196 +               else if (count >= 6 && strncmp("manual", buffer, 6)==0)
 197 +                       restart_after_close = 0;
 198 +
 199 +               return n;
 200 +       }
 201 +
 202 +       return 0;
 203 +}
 204 +
 205 +static ssize_t mtx1wd_read (struct file *file, char *buf, size_t count, loff_t *ppos)
 206 +{
 207 +       char * state = restart_after_close ? "auto\n" : "manual\n";
 208 +       int n = strlen(state)+1;
 209 +
 210 +       if (file->f_pos >= n)
 211 +               return 0;
 212 +
 213 +       if (count < n)
 214 +               return -EINVAL;
 215 +
 216 +       if(copy_to_user(buf, state, n))
 217 +               return -EFAULT;
 218 +
 219 +       file->f_pos += n;
 220 +
 221 +       return n;
 222 +}
 223 +
 224 +static struct file_operations mtx1wd_fops = {
 225 +       .owner = THIS_MODULE,
 226 +       .read = mtx1wd_read,
 227 +       .write = mtx1wd_write,
 228 +       .open = mtx1wd_open,
 229 +       .release = mtx1wd_release
 230 +};
 231 +
 232 +
 233 +static struct miscdevice mtx1wd_miscdev = {
 234 +       WATCHDOG_MINOR,
 235 +       "watchdog",
 236 +       &mtx1wd_fops
 237 +};
 238 +
 239 +
 240 +
 241 +//---------[ Module Functions ]-----------------
 242 +
 243 +
 244 +static int __init init_mtx1_watchdog(void)
 245 +{
 246 +       printk("MTX-1 watchdog driver\n");
 247 +
 248 +       misc_register(&mtx1wd_miscdev);
 249 +
 250 +       restart_after_close = 0;
 251 +
 252 +       mtx1_enable_wd ();
 253 +
 254 +       //-- trigger it for the first time.
 255 +       //-- We do not exactly know how long it has not been triggered.
 256 +       mtx1_trigger_wd ();
 257 +
 258 +       // start a timer, that calls mtx1_trigger_wd every 5 seconds.
 259 +       start_wd_timer();
 260 +
 261 +       return 0;
 262 +}
 263 +
 264 +static void __exit exit_mtx1_watchdog(void) {
 265 +
 266 +       // stop the timer, if it is running.
 267 +        stop_wd_timer();
 268 +
 269 +        misc_deregister(&mtx1wd_miscdev);
 270 +
 271 +        mtx1_disable_wd();
 272 +}
 273 +
 274 +module_init(init_mtx1_watchdog);
 275 +module_exit(exit_mtx1_watchdog);
 276 +
 277 +MODULE_AUTHOR("Michael Stickel");
 278 +MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
 279 +MODULE_LICENSE("GPL");