target/linux/linux-2.4/patches/ar7/005-wdt_driver.patch

   1 diff -ruN linux-2.4.30-patch006/drivers/char/ar7_wdt.c linux-2.4.30-patch007/drivers/char/ar7_wdt.c
   2 --- linux-2.4.30-patch006/drivers/char/ar7_wdt.c        1970-01-01 01:00:00.000000000 +0100
   3 +++ linux-2.4.30-patch007/drivers/char/ar7_wdt.c        2005-10-27 09:39:40.000000000 +0200
   4 @@ -0,0 +1,335 @@
   5 +/* linux/drivers/char/ar7_wdt.c
   6 +
   7 +   TI AR7 watch dog timer support
   8 +
   9 +   Copyright (c) 2005 Enrik Berkhan <Enrik.Berkhan@akk.org>
  10 +
  11 +   Som code taken from:
  12 +   National Semiconductor SCx200 Watchdog support
  13 +   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
  14 +
  15 +   This program is free software; you can redistribute it and/or
  16 +   modify it under the terms of the GNU General Public License as
  17 +   published by the Free Software Foundation; either version 2 of the
  18 +   License, or (at your option) any later version.
  19 +
  20 +   The author(s) of this software shall not be held liable for damages
  21 +   of any nature resulting due to the use of this software. This
  22 +   software is provided AS-IS with no warranties. */
  23 +
  24 +#include <linux/config.h>
  25 +#include <linux/module.h>
  26 +#include <linux/errno.h>
  27 +#include <linux/kernel.h>
  28 +#include <linux/init.h>
  29 +#include <linux/miscdevice.h>
  30 +#include <linux/watchdog.h>
  31 +#include <linux/notifier.h>
  32 +#include <linux/reboot.h>
  33 +#include <linux/ioport.h>
  34 +
  35 +#include <asm/uaccess.h>
  36 +
  37 +#include <asm/ar7/avalanche_misc.h>
  38 +#include <asm/ar7/sangam.h>
  39 +
  40 +#define NAME "ar7_wdt"
  41 +#define LONGNAME "TI AR7 Watchdog Timer"
  42 +
  43 +MODULE_AUTHOR("Enrik Berkhan <Enrik.Berkhan@akk.org>");
  44 +MODULE_DESCRIPTION(LONGNAME);
  45 +MODULE_LICENSE("GPL");
  46 +
  47 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
  48 +#define CONFIG_WATCHDOG_NOWAYOUT 0
  49 +#endif
  50 +
  51 +static int margin = 60;
  52 +MODULE_PARM(margin, "i");
  53 +MODULE_PARM_DESC(margin, "Watchdog margin in seconds (1 - ~68)");
  54 +
  55 +static int nowayout = CONFIG_WATCHDOG_NOWAYOUT;
  56 +MODULE_PARM(nowayout, "i");
  57 +MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
  58 +
  59 +typedef struct {
  60 +  uint32_t kick_lock;
  61 +  uint32_t kick;
  62 +  uint32_t change_lock;
  63 +  uint32_t change ;
  64 +  uint32_t disable_lock;
  65 +  uint32_t disable;
  66 +  uint32_t prescale_lock;
  67 +  uint32_t prescale;
  68 +} ar7_wdt_t;
  69 +
  70 +volatile ar7_wdt_t *ar7_wdt = (ar7_wdt_t *)AVALANCHE_WATCHDOG_TIMER_BASE;
  71 +
  72 +static struct semaphore open_semaphore;
  73 +static unsigned expect_close;
  74 +
  75 +/* XXX correct? assumed to be sysfreq/2. get this dynamically ... */
  76 +#define vbus_freq 62500000
  77 +
  78 +/* XXX currently fixed, allows max margin ~68.72 secs */
  79 +#define prescale_value 0xFFFF
  80 +
  81 +static void ar7_wdt_kick(uint32_t value)
  82 +{
  83 +  ar7_wdt->kick_lock = 0x5555;
  84 +  if ((ar7_wdt->kick_lock & 3) == 1) {
  85 +    ar7_wdt->kick_lock = 0xAAAA;
  86 +    if ((ar7_wdt->kick_lock & 3) == 3) {
  87 +      ar7_wdt->kick = value;
  88 +      return;
  89 +    }
  90 +  }
  91 +  printk(KERN_ERR NAME "failed to unlock WDT kick reg\n");
  92 +}
  93 +
  94 +static void ar7_wdt_prescale(uint32_t value)
  95 +{
  96 +  ar7_wdt->prescale_lock = 0x5A5A;
  97 +  if ((ar7_wdt->prescale_lock & 3) == 1) {
  98 +    ar7_wdt->prescale_lock = 0xA5A5;
  99 +    if ((ar7_wdt->prescale_lock & 3) == 3) {
 100 +      ar7_wdt->prescale = value;
 101 +      return;
 102 +    }
 103 +  }
 104 +  printk(KERN_ERR NAME "failed to unlock WDT prescale reg\n");
 105 +}
 106 +
 107 +static void ar7_wdt_change(uint32_t value)
 108 +{
 109 +  ar7_wdt->change_lock = 0x6666;
 110 +  if ((ar7_wdt->change_lock & 3) == 1) {
 111 +    ar7_wdt->change_lock = 0xBBBB;
 112 +    if ((ar7_wdt->change_lock & 3) == 3) {
 113 +      ar7_wdt->change = value;
 114 +      return;
 115 +    }
 116 +  }
 117 +  printk(KERN_ERR NAME "failed to unlock WDT change reg\n");
 118 +}
 119 +
 120 +static void ar7_wdt_disable(uint32_t value)
 121 +{
 122 +  ar7_wdt->disable_lock = 0x7777;
 123 +  if ((ar7_wdt->disable_lock & 3) == 1) {
 124 +    ar7_wdt->disable_lock = 0xCCCC;
 125 +    if ((ar7_wdt->disable_lock & 3) == 2) {
 126 +      ar7_wdt->disable_lock = 0xDDDD;
 127 +      if ((ar7_wdt->disable_lock & 3) == 3) {
 128 +       ar7_wdt->disable = value;
 129 +       return;
 130 +      }
 131 +    }
 132 +  }
 133 +  printk(KERN_ERR NAME "failed to unlock WDT disable reg\n");
 134 +  return;
 135 +}
 136 +
 137 +static void ar7_wdt_update_margin(int new_margin)
 138 +{
 139 +        uint32_t change;
 140 +
 141 +       change = new_margin * (vbus_freq / prescale_value);
 142 +       if (change < 1) change = 1;
 143 +       if (change > 0xFFFF) change = 0xFFFF;
 144 +       ar7_wdt_change(change);
 145 +       margin = change * prescale_value / vbus_freq;
 146 +       printk(KERN_INFO NAME
 147 +              ": timer margin %d seconds (prescale %d, change %d, freq %d)\n",
 148 +              margin, prescale_value, change, vbus_freq);
 149 +}
 150 +
 151 +static void ar7_wdt_enable_wdt(void)
 152 +{
 153 +       printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
 154 +       ar7_wdt_disable(1);
 155 +       ar7_wdt_kick(1);
 156 +}
 157 +
 158 +static void ar7_wdt_disable_wdt(void)
 159 +{
 160 +       printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
 161 +       ar7_wdt_disable(0);
 162 +}
 163 +
 164 +static int ar7_wdt_open(struct inode *inode, struct file *file)
 165 +{
 166 +        /* only allow one at a time */
 167 +        if (down_trylock(&open_semaphore))
 168 +                return -EBUSY;
 169 +       ar7_wdt_enable_wdt();
 170 +       expect_close = 0;
 171 +
 172 +       return 0;
 173 +}
 174 +
 175 +static int ar7_wdt_release(struct inode *inode, struct file *file)
 176 +{
 177 +       if (!expect_close) {
 178 +               printk(KERN_WARNING NAME ": watchdog device closed unexpectedly, will not disable the watchdog timer\n");
 179 +       } else if (!nowayout) {
 180 +               ar7_wdt_disable_wdt();
 181 +       }
 182 +        up(&open_semaphore);
 183 +
 184 +       return 0;
 185 +}
 186 +
 187 +static int ar7_wdt_notify_sys(struct notifier_block *this,
 188 +                                     unsigned long code, void *unused)
 189 +{
 190 +        if (code == SYS_HALT || code == SYS_POWER_OFF)
 191 +               if (!nowayout)
 192 +                       ar7_wdt_disable_wdt();
 193 +
 194 +        return NOTIFY_DONE;
 195 +}
 196 +
 197 +static struct notifier_block ar7_wdt_notifier =
 198 +{
 199 +        .notifier_call = ar7_wdt_notify_sys
 200 +};
 201 +
 202 +static ssize_t ar7_wdt_write(struct file *file, const char *data,
 203 +                                    size_t len, loff_t *ppos)
 204 +{
 205 +       if (ppos != &file->f_pos)
 206 +               return -ESPIPE;
 207 +
 208 +       /* check for a magic close character */
 209 +       if (len)
 210 +       {
 211 +               size_t i;
 212 +
 213 +               ar7_wdt_kick(1);
 214 +
 215 +               expect_close = 0;
 216 +               for (i = 0; i < len; ++i) {
 217 +                       char c;
 218 +                       if (get_user(c, data+i))
 219 +                               return -EFAULT;
 220 +                       if (c == 'V')
 221 +                               expect_close = 1;
 222 +               }
 223 +
 224 +       }
 225 +       return len;
 226 +}
 227 +
 228 +static int ar7_wdt_ioctl(struct inode *inode, struct file *file,
 229 +       unsigned int cmd, unsigned long arg)
 230 +{
 231 +       static struct watchdog_info ident = {
 232 +               .identity = LONGNAME,
 233 +               .firmware_version = 1,
 234 +               .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING),
 235 +       };
 236 +       int new_margin;
 237 +
 238 +       switch (cmd) {
 239 +       default:
 240 +               return -ENOTTY;
 241 +       case WDIOC_GETSUPPORT:
 242 +               if(copy_to_user((struct watchdog_info *)arg, &ident,
 243 +                               sizeof(ident)))
 244 +                       return -EFAULT;
 245 +               return 0;
 246 +       case WDIOC_GETSTATUS:
 247 +       case WDIOC_GETBOOTSTATUS:
 248 +               if (put_user(0, (int *)arg))
 249 +                       return -EFAULT;
 250 +               return 0;
 251 +       case WDIOC_KEEPALIVE:
 252 +               ar7_wdt_kick(1);
 253 +               return 0;
 254 +       case WDIOC_SETTIMEOUT:
 255 +               if (get_user(new_margin, (int *)arg))
 256 +                       return -EFAULT;
 257 +               if (new_margin < 1)
 258 +                       return -EINVAL;
 259 +
 260 +               ar7_wdt_update_margin(new_margin);
 261 +               ar7_wdt_kick(1);
 262 +
 263 +       case WDIOC_GETTIMEOUT:
 264 +               if (put_user(margin, (int *)arg))
 265 +                       return -EFAULT;
 266 +               return 0;
 267 +       }
 268 +}
 269 +
 270 +static struct file_operations ar7_wdt_fops = {
 271 +       .owner   = THIS_MODULE,
 272 +       .write   = ar7_wdt_write,
 273 +       .ioctl   = ar7_wdt_ioctl,
 274 +       .open    = ar7_wdt_open,
 275 +       .release = ar7_wdt_release,
 276 +};
 277 +
 278 +static struct miscdevice ar7_wdt_miscdev = {
 279 +       .minor = WATCHDOG_MINOR,
 280 +       .name  = "watchdog",
 281 +       .fops  = &ar7_wdt_fops,
 282 +};
 283 +
 284 +static __initdata char *last_initiator[] = {
 285 +  [HARDWARE_RESET] = "hardware reset",
 286 +  [SOFTWARE_RESET0] = "SW0 software reset",
 287 +  [SOFTWARE_RESET1] = "SW1 software reset",
 288 +  [WATCHDOG_RESET] = "watchdog"
 289 +};
 290 +
 291 +static int __init ar7_wdt_init(void)
 292 +{
 293 +       int r;
 294 +
 295 +       if (!request_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
 296 +                               sizeof(ar7_wdt_t), LONGNAME)) {
 297 +               printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
 298 +               return -EBUSY;
 299 +       }
 300 +
 301 +       printk(KERN_INFO NAME ": last system reset initiated by %s\n",
 302 +              last_initiator[avalanche_get_sys_last_reset_status()]);
 303 +
 304 +
 305 +       ar7_wdt_disable_wdt();
 306 +       ar7_wdt_prescale(prescale_value);
 307 +       ar7_wdt_update_margin(margin);
 308 +
 309 +       sema_init(&open_semaphore, 1);
 310 +
 311 +       r = misc_register(&ar7_wdt_miscdev);
 312 +       if (r) {
 313 +                printk(KERN_ERR NAME ": unable to register misc device\n");
 314 +               release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
 315 +                                  sizeof(ar7_wdt_t));
 316 +               return r;
 317 +       }
 318 +
 319 +       r = register_reboot_notifier(&ar7_wdt_notifier);
 320 +        if (r) {
 321 +                printk(KERN_ERR NAME ": unable to register reboot notifier\n");
 322 +               misc_deregister(&ar7_wdt_miscdev);
 323 +               release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
 324 +                                  sizeof(ar7_wdt_t));
 325 +                return r;
 326 +        }
 327 +
 328 +       return 0;
 329 +}
 330 +
 331 +static void __exit ar7_wdt_cleanup(void)
 332 +{
 333 +        unregister_reboot_notifier(&ar7_wdt_notifier);
 334 +       misc_deregister(&ar7_wdt_miscdev);
 335 +       release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE, sizeof(ar7_wdt_t));
 336 +}
 337 +
 338 +module_init(ar7_wdt_init);
 339 +module_exit(ar7_wdt_cleanup);
 340 diff -ruN linux-2.4.30-patch006/drivers/char/Config.in linux-2.4.30-patch007/drivers/char/Config.in
 341 --- linux-2.4.30-patch006/drivers/char/Config.in        2005-10-27 11:25:29.000000000 +0200
 342 +++ linux-2.4.30-patch007/drivers/char/Config.in        2005-10-27 11:17:32.000000000 +0200
 343 @@ -251,6 +251,9 @@
 344  bool 'Watchdog Timer Support'  CONFIG_WATCHDOG
 345  if [ "$CONFIG_WATCHDOG" != "n" ]; then
 346     bool '  Disable watchdog shutdown on close' CONFIG_WATCHDOG_NOWAYOUT
 347 +   if [ "$CONFIG_AR7" = "y" ] ; then
 348 +     tristate '  TI AR7 Watchdog Timer' CONFIG_AR7_WDT
 349 +   else
 350     tristate '  Acquire SBC Watchdog Timer' CONFIG_ACQUIRE_WDT
 351     tristate '  Advantech SBC Watchdog Timer' CONFIG_ADVANTECH_WDT
 352     tristate '  ALi M7101 PMU on ALi 1535D+ Watchdog Timer' CONFIG_ALIM1535_WDT
 353 @@ -271,7 +274,6 @@
 354     tristate '  SBC-60XX Watchdog Timer' CONFIG_60XX_WDT
 355     dep_tristate '  SC1200 Watchdog Timer (EXPERIMENTAL)' CONFIG_SC1200_WDT $CONFIG_EXPERIMENTAL
 356     tristate '  NatSemi SCx200 Watchdog' CONFIG_SCx200_WDT
 357 -   tristate '  Software Watchdog' CONFIG_SOFT_WATCHDOG
 358     tristate '  W83877F (EMACS) Watchdog Timer' CONFIG_W83877F_WDT
 359     tristate '  WDT Watchdog timer' CONFIG_WDT
 360     tristate '  WDT PCI Watchdog timer' CONFIG_WDTPCI
 361 @@ -282,6 +284,8 @@
 362        fi
 363     fi
 364     tristate '  ZF MachZ Watchdog' CONFIG_MACHZ_WDT
 365 +   fi
 366 +   tristate '  Software Watchdog' CONFIG_SOFT_WATCHDOG
 367     if [ "$CONFIG_SGI_IP22" = "y" ]; then
 368        dep_tristate '  Indy/I2 Hardware Watchdog' CONFIG_INDYDOG $CONFIG_SGI_IP22
 369     fi
 370 diff -ruN linux-2.4.30-patch006/drivers/char/Makefile linux-2.4.30-patch007/drivers/char/Makefile
 371 --- linux-2.4.30-patch006/drivers/char/Makefile 2005-10-27 11:19:38.000000000 +0200
 372 +++ linux-2.4.30-patch007/drivers/char/Makefile 2005-10-27 09:39:40.000000000 +0200
 373 @@ -342,6 +342,7 @@
 374  obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
 375  obj-$(CONFIG_INDYDOG) += indydog.o
 376  obj-$(CONFIG_8xx_WDT) += mpc8xx_wdt.o
 377 +obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 378
 379  subdir-$(CONFIG_MWAVE) += mwave
 380  ifeq ($(CONFIG_MWAVE),y)
 381 diff -ruN linux-2.4.30-patch006/include/asm-mips/ar7/sangam.h linux-2.4.30-patch007/include/asm-mips/ar7/sangam.h
 382 --- linux-2.4.30-patch006/include/asm-mips/ar7/sangam.h 2005-10-27 11:25:51.000000000 +0200
 383 +++ linux-2.4.30-patch007/include/asm-mips/ar7/sangam.h 2005-10-27 11:13:37.000000000 +0200
 384 @@ -152,7 +152,7 @@
 385  #define AVALANCHE_EMIF_SDRAM_CFG      (AVALANCHE_EMIF_CONTROL_BASE + 0x8)
 386  #define AVALANCHE_RST_CTRL_PRCR       (KSEG1ADDR(0x08611600))
 387  #define AVALANCHE_RST_CTRL_SWRCR      (KSEG1ADDR(0x08611604))
 388 -#define AVALANCHE_RST_CTRL_RSR        (KSEG1ADDR(0x08611600))
 389 +#define AVALANCHE_RST_CTRL_RSR        (KSEG1ADDR(0x08611608))
 390
 391  #define AVALANCHE_POWER_CTRL_PDCR     (KSEG1ADDR(0x08610A00))
 392  #define AVALANCHE_WAKEUP_CTRL_WKCR    (KSEG1ADDR(0x08610A0C))