target/linux/cns21xx/patches-2.6.37/006-arm-add-fa-watchdog-driver.patch

   1 --- a/drivers/watchdog/Kconfig
   2 +++ b/drivers/watchdog/Kconfig
   3 @@ -331,6 +331,13 @@ config IMX2_WDT
   4           To compile this driver as a module, choose M here: the
   5           module will be called imx2_wdt.
   6
   7 +config FA_WATCHDOG
   8 +       tristate "Faraday watchdog"
   9 +       depends on ARCH_GEMINI
  10 +       help
  11 +         Say Y here if you want support for the built-in watchdog timer
  12 +         found in some Faraday FA526 based SoCs.
  13 +
  14  # AVR32 Architecture
  15
  16  config AT32AP700X_WDT
  17 --- a/drivers/watchdog/Makefile
  18 +++ b/drivers/watchdog/Makefile
  19 @@ -49,6 +49,7 @@ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_
  20  obj-$(CONFIG_ADX_WATCHDOG) += adx_wdt.o
  21  obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
  22  obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
  23 +obj-$(CONFIG_FA_WATCHDOG) += fa_wdt.o
  24
  25  # AVR32 Architecture
  26  obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
  27 --- /dev/null
  28 +++ b/drivers/watchdog/fa_wdt.c
  29 @@ -0,0 +1,411 @@
  30 +/*
  31 + *  Watchdog driver for SoCs based on the Faraday FA526 core
  32 + *
  33 + *  Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
  34 + *  Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
  35 + *
  36 + * This program is free software; you can redistribute it and/or modify
  37 + * it under the terms of the GNU General Public License version 2 as
  38 + * published by the Free Software Foundation.
  39 + */
  40 +
  41 +#include <linux/kernel.h>
  42 +#include <linux/init.h>
  43 +#include <linux/io.h>
  44 +#include <linux/fs.h>
  45 +#include <linux/notifier.h>
  46 +#include <linux/reboot.h>
  47 +#include <linux/uaccess.h>
  48 +#include <linux/miscdevice.h>
  49 +#include <linux/platform_device.h>
  50 +#include <linux/watchdog.h>
  51 +#include <linux/slab.h>
  52 +#include <linux/fa_wdt.h>
  53 +
  54 +#define FA_WDCOUNTER           0x0
  55 +#define FA_WDLOAD              0x4
  56 +#define FA_WDRESTART           0x8
  57 +
  58 +#define WDRESTART_MAGIC                0x5AB9
  59 +
  60 +#define FA_WDCR                        0xC
  61 +
  62 +#define WDCR_CLOCK_5MHZ                (1 << 4)
  63 +#define WDCR_SYS_RST           (1 << 1)
  64 +#define WDCR_ENABLE            (1 << 0)
  65 +
  66 +#define WDT_DEFAULT_TIMEOUT    13
  67 +
  68 +/* status bits */
  69 +#define WDT_ACTIVE             0
  70 +#define WDT_OK_TO_CLOSE                1
  71 +
  72 +static unsigned int timeout = WDT_DEFAULT_TIMEOUT;
  73 +static int nowayout = WATCHDOG_NOWAYOUT;
  74 +
  75 +static DEFINE_SPINLOCK(fa_wdt_lock);
  76 +
  77 +static struct platform_device *fa_wdt_dev;
  78 +
  79 +struct fa_wdt_struct {
  80 +       struct resource         *res;
  81 +       struct device           *dev;
  82 +       void __iomem            *base;
  83 +       unsigned long           status;
  84 +       unsigned int            clock;
  85 +       unsigned int            max_timeout;
  86 +};
  87 +
  88 +static const struct watchdog_info fa_wdt_info = {
  89 +       .identity       = "Faraday watchdog",
  90 +       .options        = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
  91 +                         WDIOF_SETTIMEOUT,
  92 +};
  93 +
  94 +/* Disable the watchdog. */
  95 +static void fa_wdt_stop(struct fa_wdt_struct *fa_wdt)
  96 +{
  97 +       spin_lock(&fa_wdt_lock);
  98 +
  99 +       __raw_writel(0, fa_wdt->base + FA_WDCR);
 100 +
 101 +       clear_bit(WDT_ACTIVE, &fa_wdt->status);
 102 +
 103 +       spin_unlock(&fa_wdt_lock);
 104 +}
 105 +
 106 +/* Service the watchdog */
 107 +static void fa_wdt_service(struct fa_wdt_struct *fa_wdt)
 108 +{
 109 +       __raw_writel(WDRESTART_MAGIC, fa_wdt->base + FA_WDRESTART);
 110 +}
 111 +
 112 +/* Enable and reset the watchdog. */
 113 +static void fa_wdt_start(struct fa_wdt_struct *fa_wdt)
 114 +{
 115 +       spin_lock(&fa_wdt_lock);
 116 +
 117 +       __raw_writel(timeout * fa_wdt->clock,
 118 +                    fa_wdt->base + FA_WDLOAD);
 119 +
 120 +       fa_wdt_service(fa_wdt);
 121 +
 122 +       /* set clock before enabling */
 123 +       __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST,
 124 +                       fa_wdt->base + FA_WDCR);
 125 +
 126 +       __raw_writel(WDCR_CLOCK_5MHZ | WDCR_SYS_RST | WDCR_ENABLE,
 127 +                       fa_wdt->base + FA_WDCR);
 128 +
 129 +       set_bit(WDT_ACTIVE, &fa_wdt->status);
 130 +
 131 +       spin_unlock(&fa_wdt_lock);
 132 +}
 133 +
 134 +/* Watchdog device is opened, and watchdog starts running. */
 135 +static int fa_wdt_open(struct inode *inode, struct file *file)
 136 +{
 137 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
 138 +
 139 +       if (test_bit(WDT_ACTIVE, &fa_wdt->status))
 140 +               return -EBUSY;
 141 +
 142 +       file->private_data = fa_wdt;
 143 +
 144 +       fa_wdt_start(fa_wdt);
 145 +
 146 +       return nonseekable_open(inode, file);
 147 +}
 148 +
 149 +/* Close the watchdog device. */
 150 +static int fa_wdt_close(struct inode *inode, struct file *file)
 151 +{
 152 +       struct fa_wdt_struct *fa_wdt = file->private_data;
 153 +
 154 +       /* Disable the watchdog if possible */
 155 +       if (test_bit(WDT_OK_TO_CLOSE, &fa_wdt->status))
 156 +               fa_wdt_stop(fa_wdt);
 157 +       else
 158 +               dev_warn(fa_wdt->dev, "Device closed unexpectedly - timer will not stop\n");
 159 +
 160 +       return 0;
 161 +}
 162 +
 163 +/* Handle commands from user-space. */
 164 +static long fa_wdt_ioctl(struct file *file, unsigned int cmd,
 165 +                        unsigned long arg)
 166 +{
 167 +       struct fa_wdt_struct *fa_wdt = file->private_data;
 168 +
 169 +       int value;
 170 +
 171 +       switch (cmd) {
 172 +       case WDIOC_KEEPALIVE:
 173 +               fa_wdt_service(fa_wdt);
 174 +               return 0;
 175 +
 176 +       case WDIOC_GETSUPPORT:
 177 +               return copy_to_user((struct watchdog_info *)arg, &fa_wdt_info,
 178 +                       sizeof(fa_wdt_info)) ? -EFAULT : 0;
 179 +
 180 +       case WDIOC_SETTIMEOUT:
 181 +               if (get_user(value, (int *)arg))
 182 +                       return -EFAULT;
 183 +
 184 +               if ((value < 1) || (value > fa_wdt->max_timeout))
 185 +                       return -EINVAL;
 186 +
 187 +               timeout = value;
 188 +
 189 +               /* restart wdt to use new timeout */
 190 +               fa_wdt_stop(fa_wdt);
 191 +               fa_wdt_start(fa_wdt);
 192 +
 193 +               /* Fall through */
 194 +       case WDIOC_GETTIMEOUT:
 195 +               return put_user(timeout, (int *)arg);
 196 +
 197 +       case WDIOC_GETTIMELEFT:
 198 +               value = __raw_readl(fa_wdt->base + FA_WDCOUNTER);
 199 +               return put_user(value / fa_wdt->clock, (int *)arg);
 200 +
 201 +       default:
 202 +               return -ENOTTY;
 203 +       }
 204 +}
 205 +
 206 +/* Refresh the watchdog whenever device is written to. */
 207 +static ssize_t fa_wdt_write(struct file *file, const char *data,
 208 +                           size_t len, loff_t *ppos)
 209 +{
 210 +       struct fa_wdt_struct *fa_wdt = file->private_data;
 211 +
 212 +       if (len) {
 213 +               if (!nowayout) {
 214 +                       size_t i;
 215 +
 216 +                       clear_bit(WDT_OK_TO_CLOSE, &fa_wdt->status);
 217 +                       for (i = 0; i != len; i++) {
 218 +                               char c;
 219 +
 220 +                               if (get_user(c, data + i))
 221 +                                       return -EFAULT;
 222 +                               if (c == 'V')
 223 +                                       set_bit(WDT_OK_TO_CLOSE,
 224 +                                               &fa_wdt->status);
 225 +                       }
 226 +               }
 227 +               fa_wdt_service(fa_wdt);
 228 +       }
 229 +
 230 +       return len;
 231 +}
 232 +
 233 +static int fa_wdt_notify_sys(struct notifier_block *this,
 234 +                            unsigned long code, void *unused)
 235 +{
 236 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(fa_wdt_dev);
 237 +
 238 +       if (code == SYS_DOWN || code == SYS_HALT)
 239 +               fa_wdt_stop(fa_wdt);
 240 +
 241 +       return NOTIFY_DONE;
 242 +}
 243 +
 244 +static struct notifier_block fa_wdt_notifier = {
 245 +       .notifier_call = fa_wdt_notify_sys,
 246 +};
 247 +
 248 +static const struct file_operations fa_wdt_fops = {
 249 +       .owner          = THIS_MODULE,
 250 +       .llseek         = no_llseek,
 251 +       .unlocked_ioctl = fa_wdt_ioctl,
 252 +       .open           = fa_wdt_open,
 253 +       .release        = fa_wdt_close,
 254 +       .write          = fa_wdt_write,
 255 +};
 256 +
 257 +static struct miscdevice fa_wdt_miscdev = {
 258 +       .minor          = WATCHDOG_MINOR,
 259 +       .name           = "watchdog",
 260 +       .fops           = &fa_wdt_fops,
 261 +};
 262 +
 263 +static void fa_wdt_shutdown(struct platform_device *pdev)
 264 +{
 265 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
 266 +
 267 +       fa_wdt_stop(fa_wdt);
 268 +}
 269 +
 270 +static int __devinit fa_wdt_probe(struct platform_device *pdev)
 271 +{
 272 +       int ret;
 273 +       int res_size;
 274 +       struct resource *res;
 275 +       void __iomem *base;
 276 +       struct fa_wdt_struct *fa_wdt;
 277 +       struct fa_wdt_platform_data *pdata;
 278 +
 279 +       pdata = pdev->dev.platform_data;
 280 +       if (!pdata) {
 281 +               dev_err(&pdev->dev, "no platform data specified\n");
 282 +               return -EINVAL;
 283 +       }
 284 +
 285 +       if (!pdata->clock) {
 286 +               dev_err(&pdev->dev, "invalid clock value\n");
 287 +               return -EINVAL;
 288 +       }
 289 +
 290 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 291 +       if (!res) {
 292 +               dev_err(&pdev->dev, "can't get device resources\n");
 293 +               return -ENODEV;
 294 +       }
 295 +
 296 +       res_size = resource_size(res);
 297 +       if (!request_mem_region(res->start, res_size, res->name)) {
 298 +               dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
 299 +                       res_size, res->start);
 300 +               return -ENOMEM;
 301 +       }
 302 +
 303 +       base = ioremap(res->start, res_size);
 304 +       if (!base) {
 305 +               dev_err(&pdev->dev, "ioremap failed\n");
 306 +               ret = -EIO;
 307 +               goto fail0;
 308 +       }
 309 +
 310 +       fa_wdt = kzalloc(sizeof(struct fa_wdt_struct), GFP_KERNEL);
 311 +       if (!fa_wdt) {
 312 +               dev_err(&pdev->dev, "can't allocate interface\n");
 313 +               ret = -ENOMEM;
 314 +               goto fail1;
 315 +       }
 316 +
 317 +       /* Setup fa_wdt driver structure */
 318 +       fa_wdt->base = base;
 319 +       fa_wdt->res = res;
 320 +       fa_wdt->dev = &pdev->dev;
 321 +       fa_wdt->clock = pdata->clock;
 322 +       fa_wdt->max_timeout = 0xffffffffU / pdata->clock;
 323 +
 324 +       /* Set up platform driver data */
 325 +       platform_set_drvdata(pdev, fa_wdt);
 326 +       fa_wdt_dev = pdev;
 327 +
 328 +       if (fa_wdt_miscdev.parent) {
 329 +               ret = -EBUSY;
 330 +               goto fail2;
 331 +       }
 332 +
 333 +       ret = register_reboot_notifier(&fa_wdt_notifier);
 334 +       if (ret)
 335 +               goto fail2;
 336 +
 337 +       fa_wdt_miscdev.parent = &pdev->dev;
 338 +
 339 +       ret = misc_register(&fa_wdt_miscdev);
 340 +       if (ret)
 341 +               goto fail3;
 342 +
 343 +       return 0;
 344 +
 345 +fail3:
 346 +       unregister_reboot_notifier(&fa_wdt_notifier);
 347 +fail2:
 348 +       platform_set_drvdata(pdev, NULL);
 349 +       kfree(fa_wdt);
 350 +fail1:
 351 +       iounmap(base);
 352 +fail0:
 353 +       release_mem_region(res->start, res_size);
 354 +
 355 +       return ret;
 356 +}
 357 +
 358 +static int __devexit fa_wdt_remove(struct platform_device *pdev)
 359 +{
 360 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
 361 +
 362 +       platform_set_drvdata(pdev, NULL);
 363 +       misc_deregister(&fa_wdt_miscdev);
 364 +       unregister_reboot_notifier(&fa_wdt_notifier);
 365 +       fa_wdt_dev = NULL;
 366 +       iounmap(fa_wdt->base);
 367 +       release_mem_region(fa_wdt->res->start, resource_size(fa_wdt->res));
 368 +
 369 +       kfree(fa_wdt);
 370 +
 371 +       return 0;
 372 +}
 373 +
 374 +#ifdef CONFIG_PM
 375 +static int fa_wdt_suspend(struct platform_device *pdev, pm_message_t message)
 376 +{
 377 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
 378 +       unsigned int reg;
 379 +
 380 +       reg = __raw_readw(fa_wdt->base + FA_WDCR);
 381 +       reg &= ~(WDCR_WDENABLE);
 382 +       __raw_writel(reg, fa_wdt->base + FA_WDCR);
 383 +
 384 +       return 0;
 385 +}
 386 +
 387 +static int fa_wdt_resume(struct platform_device *pdev)
 388 +{
 389 +       struct fa_wdt_struct *fa_wdt = platform_get_drvdata(pdev);
 390 +       unsigned int reg;
 391 +
 392 +       if (fa_wdt->status) {
 393 +               reg = __raw_readw(fa_wdt->base + FA_WDCR);
 394 +               reg |= WDCR_WDENABLE;
 395 +               __raw_writel(reg, fa_wdt->base + FA_WDCR);
 396 +       }
 397 +
 398 +       return 0;
 399 +}
 400 +#else
 401 +#define fa_wdt_suspend NULL
 402 +#define fa_wdt_resume  NULL
 403 +#endif
 404 +
 405 +static struct platform_driver fa_wdt_driver = {
 406 +       .probe          = fa_wdt_probe,
 407 +       .remove         = __devexit_p(fa_wdt_remove),
 408 +       .shutdown       = fa_wdt_shutdown,
 409 +       .suspend        = fa_wdt_suspend,
 410 +       .resume         = fa_wdt_resume,
 411 +       .driver         = {
 412 +               .name   = "fa-wdt",
 413 +               .owner  = THIS_MODULE,
 414 +       },
 415 +};
 416 +
 417 +static int __init fa_wdt_init(void)
 418 +{
 419 +       return platform_driver_probe(&fa_wdt_driver, fa_wdt_probe);
 420 +}
 421 +
 422 +static void __exit fa_wdt_exit(void)
 423 +{
 424 +       platform_driver_unregister(&fa_wdt_driver);
 425 +}
 426 +
 427 +module_init(fa_wdt_init);
 428 +module_exit(fa_wdt_exit);
 429 +
 430 +module_param(timeout, uint, 0);
 431 +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
 432 +
 433 +module_param(nowayout, int, 0);
 434 +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
 435 +
 436 +MODULE_AUTHOR("Paulius Zaleckas");
 437 +MODULE_DESCRIPTION("Watchdog driver for Faraday FA526 based SoCs");
 438 +MODULE_LICENSE("GPL v2");
 439 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 440 +MODULE_ALIAS("platform:fa-wdt");
 441 --- /dev/null
 442 +++ b/include/linux/fa_wdt.h
 443 @@ -0,0 +1,13 @@
 444 +/*
 445 + * Platform data definition for the Faraday watchdog driver
 446 + */
 447 +
 448 +#ifndef _FA_WDT_H
 449 +#define _FA_WDT_H
 450 +
 451 +struct fa_wdt_platform_data {
 452 +       unsigned int    clock;
 453 +};
 454 +
 455 +#endif /* _FA_WDT_H */
 456 +