target/linux/brcm63xx/patches-2.6.33/020-watchdog.patch

   1 --- a/drivers/watchdog/Makefile
   2 +++ b/drivers/watchdog/Makefile
   3 @@ -112,6 +112,7 @@ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt
   4  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
   5  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
   6  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
   7 +obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
   8
   9  # PARISC Architecture
  10
  11 --- a/drivers/watchdog/Kconfig
  12 +++ b/drivers/watchdog/Kconfig
  13 @@ -840,6 +840,16 @@ config TXX9_WDT
  14         help
  15           Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
  16
  17 +config BCM63XX_WDT
  18 +       tristate "Broadcom BCM63xx hardware watchdog"
  19 +       depends on BCM63XX
  20 +       help
  21 +         Watchdog driver for the built in watchdog hardware in Broadcom
  22 +         BCM63xx SoC.
  23 +
  24 +         To compile thi driver as a loadable module, choose M here.
  25 +         The module will be called bcm63xx_wdt.
  26 +
  27  # PARISC Architecture
  28
  29  # POWERPC Architecture
  30 --- /dev/null
  31 +++ b/drivers/watchdog/bcm63xx_wdt.c
  32 @@ -0,0 +1,354 @@
  33 +/*
  34 + *  Broadcom BCM63xx SoC watchdog driver
  35 + *
  36 + *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
  37 + *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
  38 + *
  39 + *  This program is free software; you can redistribute it and/or
  40 + *  modify it under the terms of the GNU General Public License
  41 + *  as published by the Free Software Foundation; either version
  42 + *  2 of the License, or (at your option) any later version.
  43 + */
  44 +
  45 +#include <linux/bitops.h>
  46 +#include <linux/errno.h>
  47 +#include <linux/fs.h>
  48 +#include <linux/init.h>
  49 +#include <linux/kernel.h>
  50 +#include <linux/miscdevice.h>
  51 +#include <linux/module.h>
  52 +#include <linux/moduleparam.h>
  53 +#include <linux/reboot.h>
  54 +#include <linux/types.h>
  55 +#include <linux/uaccess.h>
  56 +#include <linux/watchdog.h>
  57 +#include <linux/timer.h>
  58 +#include <linux/jiffies.h>
  59 +#include <linux/interrupt.h>
  60 +#include <linux/ptrace.h>
  61 +#include <linux/resource.h>
  62 +#include <linux/platform_device.h>
  63 +
  64 +#include <bcm63xx_cpu.h>
  65 +#include <bcm63xx_io.h>
  66 +#include <bcm63xx_regs.h>
  67 +#include <bcm63xx_timer.h>
  68 +
  69 +#define PFX KBUILD_MODNAME
  70 +
  71 +#define WDT_HZ         50000000 /* Fclk */
  72 +#define WDT_DEFAULT_TIME       30      /* seconds */
  73 +#define WDT_MAX_TIME           256     /* seconds */
  74 +
  75 +static struct {
  76 +       void __iomem *regs;
  77 +       struct timer_list timer;
  78 +       int default_ticks;
  79 +       unsigned long inuse;
  80 +       atomic_t ticks;
  81 +} bcm63xx_wdt_device;
  82 +
  83 +static int expect_close;
  84 +
  85 +static int wdt_time = WDT_DEFAULT_TIME;
  86 +static int nowayout = WATCHDOG_NOWAYOUT;
  87 +module_param(nowayout, int, 0);
  88 +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
  89 +       __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  90 +
  91 +/* HW functions */
  92 +static void bcm63xx_wdt_hw_start(void)
  93 +{
  94 +       bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
  95 +       bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
  96 +       bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
  97 +}
  98 +
  99 +static void bcm63xx_wdt_hw_stop(void)
 100 +{
 101 +       bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
 102 +       bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
 103 +}
 104 +
 105 +static void bcm63xx_wdt_isr(void *data)
 106 +{
 107 +       struct pt_regs *regs = get_irq_regs();
 108 +
 109 +       die(PFX " fire", regs);
 110 +}
 111 +
 112 +static void bcm63xx_timer_tick(unsigned long unused)
 113 +{
 114 +       if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
 115 +               bcm63xx_wdt_hw_start();
 116 +               mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
 117 +       } else
 118 +               printk(KERN_CRIT PFX ": watchdog will restart system\n");
 119 +}
 120 +
 121 +static void bcm63xx_wdt_pet(void)
 122 +{
 123 +       atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
 124 +}
 125 +
 126 +static void bcm63xx_wdt_start(void)
 127 +{
 128 +       bcm63xx_wdt_pet();
 129 +       bcm63xx_timer_tick(0);
 130 +}
 131 +
 132 +static void bcm63xx_wdt_pause(void)
 133 +{
 134 +       del_timer_sync(&bcm63xx_wdt_device.timer);
 135 +       bcm63xx_wdt_hw_stop();
 136 +}
 137 +
 138 +static int bcm63xx_wdt_settimeout(int new_time)
 139 +{
 140 +       if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
 141 +               return -EINVAL;
 142 +
 143 +       wdt_time = new_time;
 144 +
 145 +       return 0;
 146 +}
 147 +
 148 +static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
 149 +{
 150 +       if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
 151 +               return -EBUSY;
 152 +
 153 +       bcm63xx_wdt_start();
 154 +       return nonseekable_open(inode, file);
 155 +}
 156 +
 157 +static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
 158 +{
 159 +       if (expect_close == 42)
 160 +               bcm63xx_wdt_pause();
 161 +       else {
 162 +               printk(KERN_CRIT PFX
 163 +                       ": Unexpected close, not stopping watchdog!\n");
 164 +               bcm63xx_wdt_start();
 165 +       }
 166 +       clear_bit(0, &bcm63xx_wdt_device.inuse);
 167 +       expect_close = 0;
 168 +       return 0;
 169 +}
 170 +
 171 +static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
 172 +                               size_t len, loff_t *ppos)
 173 +{
 174 +       if (len) {
 175 +               if (!nowayout) {
 176 +                       size_t i;
 177 +
 178 +                       /* In case it was set long ago */
 179 +                       expect_close = 0;
 180 +
 181 +                       for (i = 0; i != len; i++) {
 182 +                               char c;
 183 +                               if (get_user(c, data + i))
 184 +                                       return -EFAULT;
 185 +                               if (c == 'V')
 186 +                                       expect_close = 42;
 187 +                       }
 188 +               }
 189 +               bcm63xx_wdt_pet();
 190 +       }
 191 +       return len;
 192 +}
 193 +
 194 +static struct watchdog_info bcm63xx_wdt_info = {
 195 +       .identity       = PFX,
 196 +       .options        = WDIOF_SETTIMEOUT |
 197 +                               WDIOF_KEEPALIVEPING |
 198 +                               WDIOF_MAGICCLOSE,
 199 +};
 200 +
 201 +
 202 +static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
 203 +                               unsigned long arg)
 204 +{
 205 +       void __user *argp = (void __user *)arg;
 206 +       int __user *p = argp;
 207 +       int new_value, retval = -EINVAL;
 208 +
 209 +       switch (cmd) {
 210 +       case WDIOC_GETSUPPORT:
 211 +               return copy_to_user(argp, &bcm63xx_wdt_info,
 212 +                       sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
 213 +
 214 +       case WDIOC_GETSTATUS:
 215 +       case WDIOC_GETBOOTSTATUS:
 216 +               return put_user(0, p);
 217 +
 218 +       case WDIOC_SETOPTIONS:
 219 +               if (get_user(new_value, p))
 220 +                       return -EFAULT;
 221 +
 222 +               if (new_value & WDIOS_DISABLECARD) {
 223 +                       bcm63xx_wdt_pause();
 224 +                       retval = 0;
 225 +               }
 226 +               if (new_value & WDIOS_ENABLECARD) {
 227 +                       bcm63xx_wdt_start();
 228 +                       retval = 0;
 229 +               }
 230 +
 231 +               return retval;
 232 +
 233 +       case WDIOC_KEEPALIVE:
 234 +               bcm63xx_wdt_pet();
 235 +               return 0;
 236 +
 237 +       case WDIOC_SETTIMEOUT:
 238 +               if (get_user(new_value, p))
 239 +                       return -EFAULT;
 240 +
 241 +               if (bcm63xx_wdt_settimeout(new_value))
 242 +                       return -EINVAL;
 243 +
 244 +               bcm63xx_wdt_pet();
 245 +
 246 +       case WDIOC_GETTIMEOUT:
 247 +               return put_user(wdt_time, p);
 248 +
 249 +       default:
 250 +               return -ENOTTY;
 251 +
 252 +       }
 253 +}
 254 +
 255 +static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
 256 +                               unsigned long code, void *unused)
 257 +{
 258 +       if (code == SYS_DOWN || code == SYS_HALT)
 259 +               bcm63xx_wdt_pause();
 260 +       return NOTIFY_DONE;
 261 +}
 262 +
 263 +static const struct file_operations bcm63xx_wdt_fops = {
 264 +       .owner          = THIS_MODULE,
 265 +       .llseek         = no_llseek,
 266 +       .write          = bcm63xx_wdt_write,
 267 +       .unlocked_ioctl = bcm63xx_wdt_ioctl,
 268 +       .open           = bcm63xx_wdt_open,
 269 +       .release        = bcm63xx_wdt_release,
 270 +};
 271 +
 272 +static struct miscdevice bcm63xx_wdt_miscdev = {
 273 +       .minor  = WATCHDOG_MINOR,
 274 +       .name   = "watchdog",
 275 +       .fops   = &bcm63xx_wdt_fops,
 276 +};
 277 +
 278 +static struct notifier_block bcm63xx_wdt_notifier = {
 279 +       .notifier_call = bcm63xx_wdt_notify_sys,
 280 +};
 281 +
 282 +
 283 +static int bcm63xx_wdt_probe(struct platform_device *pdev)
 284 +{
 285 +       int ret;
 286 +       struct resource *r;
 287 +
 288 +       setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
 289 +
 290 +       r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 291 +       if (!r) {
 292 +               printk(KERN_ERR PFX
 293 +                       "failed to retrieve resources\n");
 294 +               return -ENODEV;
 295 +       }
 296 +
 297 +       bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
 298 +       if (!bcm63xx_wdt_device.regs) {
 299 +               printk(KERN_ERR PFX
 300 +                       "failed to remap I/O resources\n");
 301 +               return -ENXIO;
 302 +       }
 303 +
 304 +       ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
 305 +       if (ret < 0) {
 306 +               printk(KERN_ERR PFX
 307 +                       "failed to register wdt timer isr\n");
 308 +               goto unmap;
 309 +       }
 310 +
 311 +       if (bcm63xx_wdt_settimeout(wdt_time)) {
 312 +               bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
 313 +               printk(KERN_INFO PFX
 314 +                       ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
 315 +                       wdt_time);
 316 +       }
 317 +
 318 +       ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
 319 +       if (ret) {
 320 +               printk(KERN_ERR PFX
 321 +                       "failed to register reboot_notifier\n");
 322 +               goto unregister_timer;
 323 +       }
 324 +
 325 +       ret = misc_register(&bcm63xx_wdt_miscdev);
 326 +       if (ret < 0) {
 327 +               printk(KERN_ERR PFX
 328 +                       "failed to register watchdog device\n");
 329 +               goto unregister_reboot_notifier;
 330 +       }
 331 +
 332 +       printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_DEFAULT_TIME);
 333 +
 334 +       return 0;
 335 +
 336 +unregister_reboot_notifier:
 337 +       unregister_reboot_notifier(&bcm63xx_wdt_notifier);
 338 +unregister_timer:
 339 +       bcm63xx_timer_unregister(TIMER_WDT_ID);
 340 +unmap:
 341 +       iounmap(bcm63xx_wdt_device.regs);
 342 +       return ret;
 343 +}
 344 +
 345 +static int bcm63xx_wdt_remove(struct platform_device *pdev)
 346 +{
 347 +       if (!nowayout)
 348 +               bcm63xx_wdt_pause();
 349 +
 350 +       misc_deregister(&bcm63xx_wdt_miscdev);
 351 +
 352 +       iounmap(bcm63xx_wdt_device.regs);
 353 +
 354 +       unregister_reboot_notifier(&bcm63xx_wdt_notifier);
 355 +       bcm63xx_timer_unregister(TIMER_WDT_ID);
 356 +
 357 +       return 0;
 358 +}
 359 +
 360 +static struct platform_driver bcm63xx_wdt = {
 361 +       .probe  = bcm63xx_wdt_probe,
 362 +       .remove = bcm63xx_wdt_remove,
 363 +       .driver = {
 364 +               .name = "bcm63xx-wdt",
 365 +       }
 366 +};
 367 +
 368 +static int __init bcm63xx_wdt_init(void)
 369 +{
 370 +       return platform_driver_register(&bcm63xx_wdt);
 371 +}
 372 +
 373 +static void __exit bcm63xx_wdt_exit(void)
 374 +{
 375 +       platform_driver_unregister(&bcm63xx_wdt);
 376 +}
 377 +
 378 +module_init(bcm63xx_wdt_init);
 379 +module_exit(bcm63xx_wdt_exit);
 380 +
 381 +MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
 382 +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 383 +MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
 384 +MODULE_LICENSE("GPL");
 385 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 386 +MODULE_ALIAS("platform:bcm63xx-wdt");