drivers/watchdog/mtx-1_wdt.c

   1 /*
   2  *      Driver for the MTX-1 Watchdog.
   3  *
   4  *      (C) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
   5  *                              http://www.4g-systems.biz
   6  *
   7  *      (C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  *
  14  *      Neither Michael Stickel nor 4G Systems admit liability nor provide
  15  *      warranty for any of this software. This material is provided
  16  *      "AS-IS" and at no charge.
  17  *
  18  *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
  19  *
  20  *      Release 0.01.
  21  *      Author: Michael Stickel  michael.stickel@4g-systems.biz
  22  *
  23  *      Release 0.02.
  24  *      Author: Florian Fainelli florian@openwrt.org
  25  *              use the Linux watchdog/timer APIs
  26  *
  27  *      The Watchdog is configured to reset the MTX-1
  28  *      if it is not triggered for 100 seconds.
  29  *      It should not be triggered more often than 1.6 seconds.
  30  *
  31  *      A timer triggers the watchdog every 5 seconds, until
  32  *      it is opened for the first time. After the first open
  33  *      it MUST be triggered every 2..95 seconds.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/types.h>
  39 #include <linux/errno.h>
  40 #include <linux/miscdevice.h>
  41 #include <linux/fs.h>
  42 #include <linux/init.h>
  43 #include <linux/ioport.h>
  44 #include <linux/timer.h>
  45 #include <linux/completion.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/watchdog.h>
  48 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  49 =======
  50 #include <linux/platform_device.h>
  51
  52 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
  53 #include <asm/io.h>
  54 #include <asm/uaccess.h>
  55
  56 #include <asm/mach-au1x00/au1000.h>
  57 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  58 =======
  59 #include <asm/gpio.h>
  60 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
  61
  62 #define MTX1_WDT_INTERVAL       (5 * HZ)
  63
  64 static int ticks = 100 * HZ;
  65
  66 static struct {
  67         struct completion stop;
  68 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  69         volatile int running;
  70 =======
  71         int running;
  72 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
  73         struct timer_list timer;
  74 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  75         volatile int queue;
  76 =======
  77         int queue;
  78 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
  79         int default_ticks;
  80         unsigned long inuse;
  81 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  82 =======
  83         unsigned gpio;
  84 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
  85 } mtx1_wdt_device;
  86
  87 static void mtx1_wdt_trigger(unsigned long unused)
  88 {
  89         u32 tmp;
  90
  91         if (mtx1_wdt_device.running)
  92                 ticks--;
  93         /*
  94          * toggle GPIO2_15
  95          */
  96         tmp = au_readl(GPIO2_DIR);
  97 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
  98         tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
  99 =======
 100         tmp = (tmp & ~(1 << mtx1_wdt_device.gpio)) |
 101               ((~tmp) & (1 << mtx1_wdt_device.gpio));
 102 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 103         au_writel (tmp, GPIO2_DIR);
 104
 105         if (mtx1_wdt_device.queue && ticks)
 106                 mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
 107         else {
 108                 complete(&mtx1_wdt_device.stop);
 109         }
 110 }
 111
 112 static void mtx1_wdt_reset(void)
 113 {
 114         ticks = mtx1_wdt_device.default_ticks;
 115 }
 116
 117
 118 static void mtx1_wdt_start(void)
 119 {
 120         if (!mtx1_wdt_device.queue) {
 121                 mtx1_wdt_device.queue = 1;
 122 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 123                 au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
 124 =======
 125                 gpio_set_value(mtx1_wdt_device.gpio, 1);
 126 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 127                 mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
 128         }
 129         mtx1_wdt_device.running++;
 130 }
 131
 132 static int mtx1_wdt_stop(void)
 133 {
 134         if (mtx1_wdt_device.queue) {
 135                 mtx1_wdt_device.queue = 0;
 136 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 137                 au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
 138 =======
 139                 gpio_set_value(mtx1_wdt_device.gpio, 0);
 140 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 141         }
 142
 143         ticks = mtx1_wdt_device.default_ticks;
 144
 145         return 0;
 146 }
 147
 148 /* Filesystem functions */
 149
 150 static int mtx1_wdt_open(struct inode *inode, struct file *file)
 151 {
 152         if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
 153                 return -EBUSY;
 154
 155         return nonseekable_open(inode, file);
 156 }
 157
 158
 159 static int mtx1_wdt_release(struct inode *inode, struct file *file)
 160 {
 161         clear_bit(0, &mtx1_wdt_device.inuse);
 162         return 0;
 163 }
 164
 165 static int mtx1_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 166 {
 167         void __user *argp = (void __user *)arg;
 168         unsigned int value;
 169         static struct watchdog_info ident =
 170         {
 171                 .options = WDIOF_CARDRESET,
 172                 .identity = "MTX-1 WDT",
 173         };
 174
 175         switch(cmd) {
 176                 case WDIOC_KEEPALIVE:
 177                         mtx1_wdt_reset();
 178                         break;
 179                 case WDIOC_GETSTATUS:
 180                 case WDIOC_GETBOOTSTATUS:
 181                         if ( copy_to_user(argp, &value, sizeof(int)) )
 182                                 return -EFAULT;
 183                         break;
 184                 case WDIOC_GETSUPPORT:
 185                         if ( copy_to_user(argp, &ident, sizeof(ident)) )
 186                                 return -EFAULT;
 187                         break;
 188                 case WDIOC_SETOPTIONS:
 189                         if ( copy_from_user(&value, argp, sizeof(int)) )
 190                                 return -EFAULT;
 191                         switch(value) {
 192                                 case WDIOS_ENABLECARD:
 193                                         mtx1_wdt_start();
 194                                         break;
 195                                 case WDIOS_DISABLECARD:
 196                                         return mtx1_wdt_stop();
 197                                 default:
 198                                         return -EINVAL;
 199                         }
 200                         break;
 201                 default:
 202                         return -ENOTTY;
 203         }
 204         return 0;
 205 }
 206
 207
 208 static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 209 {
 210         if (!count)
 211                 return -EIO;
 212
 213         mtx1_wdt_reset();
 214         return count;
 215 }
 216
 217 static const struct file_operations mtx1_wdt_fops = {
 218         .owner          = THIS_MODULE,
 219         .llseek         = no_llseek,
 220         .ioctl          = mtx1_wdt_ioctl,
 221         .open           = mtx1_wdt_open,
 222         .write          = mtx1_wdt_write,
 223         .release        = mtx1_wdt_release
 224 };
 225
 226
 227 static struct miscdevice mtx1_wdt_misc = {
 228         .minor  = WATCHDOG_MINOR,
 229         .name   = "watchdog",
 230         .fops   = &mtx1_wdt_fops
 231 };
 232
 233
 234 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 235 static int __init mtx1_wdt_init(void)
 236 =======
 237 static int mtx1_wdt_probe(struct platform_device *pdev)
 238 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 239 {
 240         int ret;
 241
 242 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 243 =======
 244         mtx1_wdt_device.gpio = pdev->resource[0].start;
 245
 246 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 247         if ((ret = misc_register(&mtx1_wdt_misc)) < 0) {
 248                 printk(KERN_ERR " mtx-1_wdt : failed to register\n");
 249                 return ret;
 250         }
 251
 252         init_completion(&mtx1_wdt_device.stop);
 253         mtx1_wdt_device.queue = 0;
 254
 255         clear_bit(0, &mtx1_wdt_device.inuse);
 256
 257         setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L);
 258
 259         mtx1_wdt_device.default_ticks = ticks;
 260
 261         mtx1_wdt_start();
 262
 263         printk(KERN_INFO "MTX-1 Watchdog driver\n");
 264
 265         return 0;
 266 }
 267
 268 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 269 static void __exit mtx1_wdt_exit(void)
 270 =======
 271 static int mtx1_wdt_remove(struct platform_device *pdev)
 272 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 273 {
 274         if (mtx1_wdt_device.queue) {
 275                 mtx1_wdt_device.queue = 0;
 276                 wait_for_completion(&mtx1_wdt_device.stop);
 277         }
 278         misc_deregister(&mtx1_wdt_misc);
 279 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 280 =======
 281         return 0;
 282 }
 283
 284 static struct platform_driver mtx1_wdt = {
 285         .probe = mtx1_wdt_probe,
 286         .remove = mtx1_wdt_remove,
 287         .driver.name = "mtx1-wdt",
 288 };
 289
 290 static int __init mtx1_wdt_init(void)
 291 {
 292         return platform_driver_register(&mtx1_wdt);
 293 }
 294
 295 static void __exit mtx1_wdt_exit(void)
 296 {
 297         platform_driver_unregister(&mtx1_wdt);
 298 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c
 299 }
 300
 301 module_init(mtx1_wdt_init);
 302 module_exit(mtx1_wdt_exit);
 303
 304 MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
 305 MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
 306 MODULE_LICENSE("GPL");
 307 <<<<<<< HEAD:drivers/watchdog/mtx-1_wdt.c
 308 =======
 309 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 310 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/watchdog/mtx-1_wdt.c