Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Blackfin On-Chip Watchdog Driver |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 3 | * |
| 4 | * Originally based on softdog.c |
Mike Frysinger | 3dae93e | 2010-02-15 19:32:25 -0500 | [diff] [blame] | 5 | * Copyright 2006-2010 Analog Devices Inc. |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 6 | * Copyright 2006-2007 Michele d'Amico |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 7 | * Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk> |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 8 | * |
| 9 | * Enter bugs at http://blackfin.uclinux.org/ |
| 10 | * |
| 11 | * Licensed under the GPL-2 or later. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/moduleparam.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/timer.h> |
| 19 | #include <linux/miscdevice.h> |
| 20 | #include <linux/watchdog.h> |
| 21 | #include <linux/fs.h> |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 22 | #include <linux/init.h> |
| 23 | #include <linux/interrupt.h> |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 24 | #include <linux/uaccess.h> |
Wim Van Sebroeck | 089ab07 | 2008-07-15 11:46:11 +0000 | [diff] [blame] | 25 | #include <asm/blackfin.h> |
Mike Frysinger | 42bd5d4 | 2010-03-09 11:07:40 -0500 | [diff] [blame] | 26 | #include <asm/bfin_watchdog.h> |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 27 | |
Wim Van Sebroeck | a77dba7 | 2009-04-14 20:20:07 +0000 | [diff] [blame] | 28 | #define stamp(fmt, args...) \ |
| 29 | pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args) |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 30 | #define stampit() stamp("here i am") |
Wim Van Sebroeck | a77dba7 | 2009-04-14 20:20:07 +0000 | [diff] [blame] | 31 | #define pr_devinit(fmt, args...) \ |
| 32 | ({ static const __devinitconst char __fmt[] = fmt; \ |
| 33 | printk(__fmt, ## args); }) |
| 34 | #define pr_init(fmt, args...) \ |
| 35 | ({ static const __initconst char __fmt[] = fmt; \ |
| 36 | printk(__fmt, ## args); }) |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 37 | |
| 38 | #define WATCHDOG_NAME "bfin-wdt" |
| 39 | #define PFX WATCHDOG_NAME ": " |
| 40 | |
| 41 | /* The BF561 has two watchdogs (one per core), but since Linux |
| 42 | * only runs on core A, we'll just work with that one. |
| 43 | */ |
| 44 | #ifdef BF561_FAMILY |
| 45 | # define bfin_read_WDOG_CTL() bfin_read_WDOGA_CTL() |
| 46 | # define bfin_read_WDOG_CNT() bfin_read_WDOGA_CNT() |
| 47 | # define bfin_read_WDOG_STAT() bfin_read_WDOGA_STAT() |
| 48 | # define bfin_write_WDOG_CTL(x) bfin_write_WDOGA_CTL(x) |
| 49 | # define bfin_write_WDOG_CNT(x) bfin_write_WDOGA_CNT(x) |
| 50 | # define bfin_write_WDOG_STAT(x) bfin_write_WDOGA_STAT(x) |
| 51 | #endif |
| 52 | |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 53 | /* some defaults */ |
| 54 | #define WATCHDOG_TIMEOUT 20 |
| 55 | |
| 56 | static unsigned int timeout = WATCHDOG_TIMEOUT; |
| 57 | static int nowayout = WATCHDOG_NOWAYOUT; |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 58 | static const struct watchdog_info bfin_wdt_info; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 59 | static unsigned long open_check; |
| 60 | static char expect_close; |
Jiri Slaby | bf6350a | 2007-11-10 05:58:44 +0100 | [diff] [blame] | 61 | static DEFINE_SPINLOCK(bfin_wdt_spinlock); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 62 | |
| 63 | /** |
| 64 | * bfin_wdt_keepalive - Keep the Userspace Watchdog Alive |
| 65 | * |
| 66 | * The Userspace watchdog got a KeepAlive: schedule the next timeout. |
| 67 | */ |
| 68 | static int bfin_wdt_keepalive(void) |
| 69 | { |
| 70 | stampit(); |
| 71 | bfin_write_WDOG_STAT(0); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * bfin_wdt_stop - Stop the Watchdog |
| 77 | * |
| 78 | * Stops the on-chip watchdog. |
| 79 | */ |
| 80 | static int bfin_wdt_stop(void) |
| 81 | { |
| 82 | stampit(); |
| 83 | bfin_write_WDOG_CTL(WDEN_DISABLE); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * bfin_wdt_start - Start the Watchdog |
| 89 | * |
| 90 | * Starts the on-chip watchdog. Automatically loads WDOG_CNT |
| 91 | * into WDOG_STAT for us. |
| 92 | */ |
| 93 | static int bfin_wdt_start(void) |
| 94 | { |
| 95 | stampit(); |
| 96 | bfin_write_WDOG_CTL(WDEN_ENABLE | ICTL_RESET); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * bfin_wdt_running - Check Watchdog status |
| 102 | * |
| 103 | * See if the watchdog is running. |
| 104 | */ |
| 105 | static int bfin_wdt_running(void) |
| 106 | { |
| 107 | stampit(); |
| 108 | return ((bfin_read_WDOG_CTL() & WDEN_MASK) != WDEN_DISABLE); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * bfin_wdt_set_timeout - Set the Userspace Watchdog timeout |
| 113 | * @t: new timeout value (in seconds) |
| 114 | * |
| 115 | * Translate the specified timeout in seconds into System Clock |
| 116 | * terms which is what the on-chip Watchdog requires. |
| 117 | */ |
| 118 | static int bfin_wdt_set_timeout(unsigned long t) |
| 119 | { |
Mike Frysinger | 3dae93e | 2010-02-15 19:32:25 -0500 | [diff] [blame] | 120 | u32 cnt, max_t, sclk; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 121 | unsigned long flags; |
| 122 | |
Mike Frysinger | 3dae93e | 2010-02-15 19:32:25 -0500 | [diff] [blame] | 123 | sclk = get_sclk(); |
| 124 | max_t = -1 / sclk; |
| 125 | cnt = t * sclk; |
| 126 | stamp("maxtimeout=%us newtimeout=%lus (cnt=%#x)", max_t, t, cnt); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 127 | |
Mike Frysinger | 3dae93e | 2010-02-15 19:32:25 -0500 | [diff] [blame] | 128 | if (t > max_t) { |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 129 | printk(KERN_WARNING PFX "timeout value is too large\n"); |
| 130 | return -EINVAL; |
| 131 | } |
| 132 | |
| 133 | spin_lock_irqsave(&bfin_wdt_spinlock, flags); |
| 134 | { |
| 135 | int run = bfin_wdt_running(); |
| 136 | bfin_wdt_stop(); |
| 137 | bfin_write_WDOG_CNT(cnt); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 138 | if (run) |
| 139 | bfin_wdt_start(); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 140 | } |
| 141 | spin_unlock_irqrestore(&bfin_wdt_spinlock, flags); |
| 142 | |
| 143 | timeout = t; |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * bfin_wdt_open - Open the Device |
| 150 | * @inode: inode of device |
| 151 | * @file: file handle of device |
| 152 | * |
| 153 | * Watchdog device is opened and started. |
| 154 | */ |
| 155 | static int bfin_wdt_open(struct inode *inode, struct file *file) |
| 156 | { |
| 157 | stampit(); |
| 158 | |
| 159 | if (test_and_set_bit(0, &open_check)) |
| 160 | return -EBUSY; |
| 161 | |
| 162 | if (nowayout) |
| 163 | __module_get(THIS_MODULE); |
| 164 | |
| 165 | bfin_wdt_keepalive(); |
| 166 | bfin_wdt_start(); |
| 167 | |
| 168 | return nonseekable_open(inode, file); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * bfin_wdt_close - Close the Device |
| 173 | * @inode: inode of device |
| 174 | * @file: file handle of device |
| 175 | * |
| 176 | * Watchdog device is closed and stopped. |
| 177 | */ |
| 178 | static int bfin_wdt_release(struct inode *inode, struct file *file) |
| 179 | { |
| 180 | stampit(); |
| 181 | |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 182 | if (expect_close == 42) |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 183 | bfin_wdt_stop(); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 184 | else { |
| 185 | printk(KERN_CRIT PFX |
| 186 | "Unexpected close, not stopping watchdog!\n"); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 187 | bfin_wdt_keepalive(); |
| 188 | } |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 189 | expect_close = 0; |
| 190 | clear_bit(0, &open_check); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * bfin_wdt_write - Write to Device |
| 196 | * @file: file handle of device |
| 197 | * @buf: buffer to write |
| 198 | * @count: length of buffer |
| 199 | * @ppos: offset |
| 200 | * |
| 201 | * Pings the watchdog on write. |
| 202 | */ |
| 203 | static ssize_t bfin_wdt_write(struct file *file, const char __user *data, |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 204 | size_t len, loff_t *ppos) |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 205 | { |
| 206 | stampit(); |
| 207 | |
| 208 | if (len) { |
| 209 | if (!nowayout) { |
| 210 | size_t i; |
| 211 | |
| 212 | /* In case it was set long ago */ |
| 213 | expect_close = 0; |
| 214 | |
| 215 | for (i = 0; i != len; i++) { |
| 216 | char c; |
| 217 | if (get_user(c, data + i)) |
| 218 | return -EFAULT; |
| 219 | if (c == 'V') |
| 220 | expect_close = 42; |
| 221 | } |
| 222 | } |
| 223 | bfin_wdt_keepalive(); |
| 224 | } |
| 225 | |
| 226 | return len; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * bfin_wdt_ioctl - Query Device |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 231 | * @file: file handle of device |
| 232 | * @cmd: watchdog command |
| 233 | * @arg: argument |
| 234 | * |
| 235 | * Query basic information from the device or ping it, as outlined by the |
| 236 | * watchdog API. |
| 237 | */ |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 238 | static long bfin_wdt_ioctl(struct file *file, |
| 239 | unsigned int cmd, unsigned long arg) |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 240 | { |
| 241 | void __user *argp = (void __user *)arg; |
| 242 | int __user *p = argp; |
| 243 | |
| 244 | stampit(); |
| 245 | |
| 246 | switch (cmd) { |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 247 | case WDIOC_GETSUPPORT: |
| 248 | if (copy_to_user(argp, &bfin_wdt_info, sizeof(bfin_wdt_info))) |
| 249 | return -EFAULT; |
| 250 | else |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 251 | return 0; |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 252 | case WDIOC_GETSTATUS: |
| 253 | case WDIOC_GETBOOTSTATUS: |
| 254 | return put_user(!!(_bfin_swrst & SWRST_RESET_WDOG), p); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 255 | case WDIOC_SETOPTIONS: { |
| 256 | unsigned long flags; |
| 257 | int options, ret = -EINVAL; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 258 | |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 259 | if (get_user(options, p)) |
| 260 | return -EFAULT; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 261 | |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 262 | spin_lock_irqsave(&bfin_wdt_spinlock, flags); |
| 263 | if (options & WDIOS_DISABLECARD) { |
| 264 | bfin_wdt_stop(); |
| 265 | ret = 0; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 266 | } |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 267 | if (options & WDIOS_ENABLECARD) { |
| 268 | bfin_wdt_start(); |
| 269 | ret = 0; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 270 | } |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 271 | spin_unlock_irqrestore(&bfin_wdt_spinlock, flags); |
| 272 | return ret; |
| 273 | } |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 274 | case WDIOC_KEEPALIVE: |
| 275 | bfin_wdt_keepalive(); |
| 276 | return 0; |
| 277 | case WDIOC_SETTIMEOUT: { |
| 278 | int new_timeout; |
| 279 | |
| 280 | if (get_user(new_timeout, p)) |
| 281 | return -EFAULT; |
| 282 | if (bfin_wdt_set_timeout(new_timeout)) |
| 283 | return -EINVAL; |
| 284 | } |
| 285 | /* Fall */ |
| 286 | case WDIOC_GETTIMEOUT: |
| 287 | return put_user(timeout, p); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 288 | default: |
| 289 | return -ENOTTY; |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 290 | } |
| 291 | } |
| 292 | |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 293 | #ifdef CONFIG_PM |
| 294 | static int state_before_suspend; |
| 295 | |
| 296 | /** |
| 297 | * bfin_wdt_suspend - suspend the watchdog |
| 298 | * @pdev: device being suspended |
| 299 | * @state: requested suspend state |
| 300 | * |
| 301 | * Remember if the watchdog was running and stop it. |
| 302 | * TODO: is this even right? Doesn't seem to be any |
| 303 | * standard in the watchdog world ... |
| 304 | */ |
| 305 | static int bfin_wdt_suspend(struct platform_device *pdev, pm_message_t state) |
| 306 | { |
| 307 | stampit(); |
| 308 | |
| 309 | state_before_suspend = bfin_wdt_running(); |
| 310 | bfin_wdt_stop(); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * bfin_wdt_resume - resume the watchdog |
| 317 | * @pdev: device being resumed |
| 318 | * |
| 319 | * If the watchdog was running, turn it back on. |
| 320 | */ |
| 321 | static int bfin_wdt_resume(struct platform_device *pdev) |
| 322 | { |
| 323 | stampit(); |
| 324 | |
| 325 | if (state_before_suspend) { |
| 326 | bfin_wdt_set_timeout(timeout); |
| 327 | bfin_wdt_start(); |
| 328 | } |
| 329 | |
| 330 | return 0; |
| 331 | } |
| 332 | #else |
| 333 | # define bfin_wdt_suspend NULL |
| 334 | # define bfin_wdt_resume NULL |
| 335 | #endif |
| 336 | |
Jan Engelhardt | b47a166 | 2008-01-22 20:48:10 +0100 | [diff] [blame] | 337 | static const struct file_operations bfin_wdt_fops = { |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 338 | .owner = THIS_MODULE, |
| 339 | .llseek = no_llseek, |
| 340 | .write = bfin_wdt_write, |
| 341 | .unlocked_ioctl = bfin_wdt_ioctl, |
| 342 | .open = bfin_wdt_open, |
| 343 | .release = bfin_wdt_release, |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 344 | }; |
| 345 | |
| 346 | static struct miscdevice bfin_wdt_miscdev = { |
| 347 | .minor = WATCHDOG_MINOR, |
| 348 | .name = "watchdog", |
| 349 | .fops = &bfin_wdt_fops, |
| 350 | }; |
| 351 | |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 352 | static const struct watchdog_info bfin_wdt_info = { |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 353 | .identity = "Blackfin Watchdog", |
| 354 | .options = WDIOF_SETTIMEOUT | |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 355 | WDIOF_KEEPALIVEPING | |
| 356 | WDIOF_MAGICCLOSE, |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 357 | }; |
| 358 | |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 359 | /** |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 360 | * bfin_wdt_probe - Initialize module |
| 361 | * |
Wim Van Sebroeck | 168b525 | 2009-12-26 19:13:00 +0000 | [diff] [blame] | 362 | * Registers the misc device. Actual device |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 363 | * initialization is handled by bfin_wdt_open(). |
| 364 | */ |
| 365 | static int __devinit bfin_wdt_probe(struct platform_device *pdev) |
| 366 | { |
| 367 | int ret; |
| 368 | |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 369 | ret = misc_register(&bfin_wdt_miscdev); |
| 370 | if (ret) { |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 371 | pr_devinit(KERN_ERR PFX |
| 372 | "cannot register miscdev on minor=%d (err=%d)\n", |
| 373 | WATCHDOG_MINOR, ret); |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | pr_devinit(KERN_INFO PFX "initialized: timeout=%d sec (nowayout=%d)\n", |
| 378 | timeout, nowayout); |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * bfin_wdt_remove - Initialize module |
| 385 | * |
Wim Van Sebroeck | 168b525 | 2009-12-26 19:13:00 +0000 | [diff] [blame] | 386 | * Unregisters the misc device. Actual device |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 387 | * deinitialization is handled by bfin_wdt_close(). |
| 388 | */ |
| 389 | static int __devexit bfin_wdt_remove(struct platform_device *pdev) |
| 390 | { |
| 391 | misc_deregister(&bfin_wdt_miscdev); |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 392 | return 0; |
| 393 | } |
| 394 | |
Wim Van Sebroeck | 168b525 | 2009-12-26 19:13:00 +0000 | [diff] [blame] | 395 | /** |
| 396 | * bfin_wdt_shutdown - Soft Shutdown Handler |
| 397 | * |
| 398 | * Handles the soft shutdown event. |
| 399 | */ |
| 400 | static void bfin_wdt_shutdown(struct platform_device *pdev) |
| 401 | { |
| 402 | stampit(); |
| 403 | |
| 404 | bfin_wdt_stop(); |
| 405 | } |
| 406 | |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 407 | static struct platform_device *bfin_wdt_device; |
| 408 | |
| 409 | static struct platform_driver bfin_wdt_driver = { |
| 410 | .probe = bfin_wdt_probe, |
| 411 | .remove = __devexit_p(bfin_wdt_remove), |
Wim Van Sebroeck | 168b525 | 2009-12-26 19:13:00 +0000 | [diff] [blame] | 412 | .shutdown = bfin_wdt_shutdown, |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 413 | .suspend = bfin_wdt_suspend, |
| 414 | .resume = bfin_wdt_resume, |
| 415 | .driver = { |
| 416 | .name = WATCHDOG_NAME, |
| 417 | .owner = THIS_MODULE, |
| 418 | }, |
| 419 | }; |
| 420 | |
| 421 | /** |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 422 | * bfin_wdt_init - Initialize module |
| 423 | * |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 424 | * Checks the module params and registers the platform device & driver. |
| 425 | * Real work is in the platform probe function. |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 426 | */ |
| 427 | static int __init bfin_wdt_init(void) |
| 428 | { |
| 429 | int ret; |
| 430 | |
| 431 | stampit(); |
| 432 | |
| 433 | /* Check that the timeout value is within range */ |
| 434 | if (bfin_wdt_set_timeout(timeout)) |
| 435 | return -EINVAL; |
| 436 | |
| 437 | /* Since this is an on-chip device and needs no board-specific |
| 438 | * resources, we'll handle all the platform device stuff here. |
| 439 | */ |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 440 | ret = platform_driver_register(&bfin_wdt_driver); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 441 | if (ret) { |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 442 | pr_init(KERN_ERR PFX "unable to register driver\n"); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 443 | return ret; |
| 444 | } |
| 445 | |
Wim Van Sebroeck | a77dba7 | 2009-04-14 20:20:07 +0000 | [diff] [blame] | 446 | bfin_wdt_device = platform_device_register_simple(WATCHDOG_NAME, |
| 447 | -1, NULL, 0); |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 448 | if (IS_ERR(bfin_wdt_device)) { |
| 449 | pr_init(KERN_ERR PFX "unable to register device\n"); |
| 450 | platform_driver_unregister(&bfin_wdt_driver); |
| 451 | return PTR_ERR(bfin_wdt_device); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 452 | } |
| 453 | |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * bfin_wdt_exit - Deinitialize module |
| 459 | * |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 460 | * Back out the platform device & driver steps. Real work is in the |
| 461 | * platform remove function. |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 462 | */ |
| 463 | static void __exit bfin_wdt_exit(void) |
| 464 | { |
Mike Frysinger | 93539b1 | 2008-03-27 11:53:32 -0700 | [diff] [blame] | 465 | platform_device_unregister(bfin_wdt_device); |
| 466 | platform_driver_unregister(&bfin_wdt_driver); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | module_init(bfin_wdt_init); |
| 470 | module_exit(bfin_wdt_exit); |
| 471 | |
| 472 | MODULE_AUTHOR("Michele d'Amico, Mike Frysinger <vapier@gentoo.org>"); |
| 473 | MODULE_DESCRIPTION("Blackfin Watchdog Device Driver"); |
| 474 | MODULE_LICENSE("GPL"); |
| 475 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| 476 | |
| 477 | module_param(timeout, uint, 0); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 478 | MODULE_PARM_DESC(timeout, |
| 479 | "Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default=" |
| 480 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); |
Bryan Wu | 1e6d320 | 2007-07-15 02:50:02 +0800 | [diff] [blame] | 481 | |
| 482 | module_param(nowayout, int, 0); |
Alan Cox | 9a5f50d | 2008-05-19 14:06:30 +0100 | [diff] [blame] | 483 | MODULE_PARM_DESC(nowayout, |
| 484 | "Watchdog cannot be stopped once started (default=" |
| 485 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |