Commit | Line | Data |
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789fc0ad SAMJ |
1 | /* |
2 | * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x | |
3 | * | |
00b3b3e6 | 4 | * This code is based on wdt.c with original copyright. |
789fc0ad | 5 | * |
00b3b3e6 SAMJ |
6 | * (C) Copyright 2006 Sven Anders, <anders@anduras.de> |
7 | * and Marcus Junker, <junker@anduras.de> | |
789fc0ad SAMJ |
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 | * | |
00b3b3e6 | 14 | * Neither Sven Anders, Marcus Junker nor ANDURAS AG |
789fc0ad SAMJ |
15 | * admit liability nor provide warranty for any of this software. |
16 | * This material is provided "AS-IS" and at no charge. | |
17 | * | |
00b3b3e6 | 18 | * Release 1.1 |
789fc0ad SAMJ |
19 | */ |
20 | ||
27c766aa JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
789fc0ad SAMJ |
23 | #include <linux/module.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/miscdevice.h> | |
26 | #include <linux/watchdog.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/reboot.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/moduleparam.h> | |
aee334c2 AC |
35 | #include <linux/io.h> |
36 | #include <linux/uaccess.h> | |
789fc0ad | 37 | |
789fc0ad SAMJ |
38 | #include <asm/system.h> |
39 | ||
00b3b3e6 | 40 | /* #define DEBUG 1 */ |
789fc0ad | 41 | |
7944d3a5 | 42 | #define DEFAULT_TIMEOUT 1 /* 1 minute */ |
00b3b3e6 | 43 | #define MAX_TIMEOUT 255 |
789fc0ad | 44 | |
00b3b3e6 SAMJ |
45 | #define VERSION "1.1" |
46 | #define MODNAME "pc87413 WDT" | |
00b3b3e6 | 47 | #define DPFX MODNAME " - DEBUG: " |
789fc0ad | 48 | |
7944d3a5 | 49 | #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ |
00b3b3e6 SAMJ |
50 | #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) |
51 | #define SWC_LDN 0x04 | |
7944d3a5 | 52 | #define SIOCFG2 0x22 /* Serial IO register */ |
25985edc | 53 | #define WDCTL 0x10 /* Watchdog-Timer-Control-Register */ |
7944d3a5 WVS |
54 | #define WDTO 0x11 /* Watchdog timeout register */ |
55 | #define WDCFG 0x12 /* Watchdog config register */ | |
789fc0ad | 56 | |
76550d32 RD |
57 | #define IO_DEFAULT 0x2E /* Address used on Portwell Boards */ |
58 | ||
59 | static int io = IO_DEFAULT; | |
7ccdb946 | 60 | static int swc_base_addr = -1; |
789fc0ad | 61 | |
7944d3a5 | 62 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
aee334c2 | 63 | static unsigned long timer_enabled; /* is the timer enabled? */ |
789fc0ad | 64 | |
aee334c2 | 65 | static char expect_close; /* is the close expected? */ |
789fc0ad | 66 | |
aee334c2 | 67 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
789fc0ad | 68 | |
00b3b3e6 | 69 | static int nowayout = WATCHDOG_NOWAYOUT; |
789fc0ad | 70 | |
00b3b3e6 | 71 | /* -- Low level function ----------------------------------------*/ |
789fc0ad | 72 | |
00b3b3e6 | 73 | /* Select pins for Watchdog output */ |
789fc0ad | 74 | |
aee334c2 | 75 | static inline void pc87413_select_wdt_out(void) |
789fc0ad | 76 | { |
00b3b3e6 | 77 | unsigned int cr_data = 0; |
789fc0ad | 78 | |
00b3b3e6 | 79 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
789fc0ad SAMJ |
80 | |
81 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
82 | ||
aee334c2 | 83 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
84 | |
85 | cr_data |= 0x80; /* Set Bit7 to 1*/ | |
86 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
87 | ||
88 | outb_p(cr_data, WDT_DATA_IO_PORT); | |
89 | ||
00b3b3e6 | 90 | #ifdef DEBUG |
27c766aa | 91 | pr_info(DPFX |
aee334c2 AC |
92 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", |
93 | cr_data); | |
00b3b3e6 | 94 | #endif |
789fc0ad SAMJ |
95 | } |
96 | ||
00b3b3e6 | 97 | /* Enable SWC functions */ |
789fc0ad | 98 | |
00b3b3e6 SAMJ |
99 | static inline void pc87413_enable_swc(void) |
100 | { | |
aee334c2 | 101 | unsigned int cr_data = 0; |
789fc0ad SAMJ |
102 | |
103 | /* Step 2: Enable SWC functions */ | |
104 | ||
7944d3a5 | 105 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ |
789fc0ad SAMJ |
106 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); |
107 | ||
7944d3a5 | 108 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ |
00b3b3e6 | 109 | cr_data = inb(WDT_DATA_IO_PORT); |
7944d3a5 | 110 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
789fc0ad | 111 | outb_p(0x30, WDT_INDEX_IO_PORT); |
7944d3a5 | 112 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ |
789fc0ad | 113 | |
00b3b3e6 | 114 | #ifdef DEBUG |
27c766aa | 115 | pr_info(DPFX "pc87413 - Enable SWC functions\n"); |
00b3b3e6 | 116 | #endif |
789fc0ad SAMJ |
117 | } |
118 | ||
00b3b3e6 SAMJ |
119 | /* Read SWC I/O base address */ |
120 | ||
7ccdb946 | 121 | static void pc87413_get_swc_base_addr(void) |
789fc0ad | 122 | { |
00b3b3e6 | 123 | unsigned char addr_l, addr_h = 0; |
789fc0ad SAMJ |
124 | |
125 | /* Step 3: Read SWC I/O Base Address */ | |
126 | ||
7944d3a5 | 127 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ |
00b3b3e6 | 128 | addr_h = inb(WDT_DATA_IO_PORT); |
789fc0ad | 129 | |
7944d3a5 | 130 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ |
789fc0ad | 131 | |
00b3b3e6 | 132 | addr_l = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
133 | |
134 | swc_base_addr = (addr_h << 8) + addr_l; | |
00b3b3e6 | 135 | #ifdef DEBUG |
27c766aa | 136 | pr_info(DPFX |
aee334c2 AC |
137 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", |
138 | addr_l, addr_h, swc_base_addr); | |
00b3b3e6 | 139 | #endif |
789fc0ad SAMJ |
140 | } |
141 | ||
00b3b3e6 SAMJ |
142 | /* Select Bank 3 of SWC */ |
143 | ||
7ccdb946 | 144 | static inline void pc87413_swc_bank3(void) |
789fc0ad SAMJ |
145 | { |
146 | /* Step 4: Select Bank3 of SWC */ | |
00b3b3e6 | 147 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
00b3b3e6 | 148 | #ifdef DEBUG |
27c766aa | 149 | pr_info(DPFX "Select Bank3 of SWC\n"); |
00b3b3e6 | 150 | #endif |
789fc0ad SAMJ |
151 | } |
152 | ||
00b3b3e6 SAMJ |
153 | /* Set watchdog timeout to x minutes */ |
154 | ||
7ccdb946 | 155 | static inline void pc87413_programm_wdto(char pc87413_time) |
789fc0ad SAMJ |
156 | { |
157 | /* Step 5: Programm WDTO, Twd. */ | |
00b3b3e6 | 158 | outb_p(pc87413_time, swc_base_addr + WDTO); |
00b3b3e6 | 159 | #ifdef DEBUG |
27c766aa | 160 | pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time); |
00b3b3e6 | 161 | #endif |
789fc0ad SAMJ |
162 | } |
163 | ||
00b3b3e6 SAMJ |
164 | /* Enable WDEN */ |
165 | ||
7ccdb946 | 166 | static inline void pc87413_enable_wden(void) |
789fc0ad SAMJ |
167 | { |
168 | /* Step 6: Enable WDEN */ | |
aee334c2 | 169 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
00b3b3e6 | 170 | #ifdef DEBUG |
27c766aa | 171 | pr_info(DPFX "Enable WDEN\n"); |
00b3b3e6 | 172 | #endif |
789fc0ad SAMJ |
173 | } |
174 | ||
00b3b3e6 | 175 | /* Enable SW_WD_TREN */ |
7ccdb946 | 176 | static inline void pc87413_enable_sw_wd_tren(void) |
789fc0ad SAMJ |
177 | { |
178 | /* Enable SW_WD_TREN */ | |
aee334c2 | 179 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
00b3b3e6 | 180 | #ifdef DEBUG |
27c766aa | 181 | pr_info(DPFX "Enable SW_WD_TREN\n"); |
00b3b3e6 | 182 | #endif |
789fc0ad SAMJ |
183 | } |
184 | ||
00b3b3e6 SAMJ |
185 | /* Disable SW_WD_TREN */ |
186 | ||
7ccdb946 | 187 | static inline void pc87413_disable_sw_wd_tren(void) |
789fc0ad SAMJ |
188 | { |
189 | /* Disable SW_WD_TREN */ | |
aee334c2 | 190 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
00b3b3e6 | 191 | #ifdef DEBUG |
27c766aa | 192 | pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n"); |
00b3b3e6 | 193 | #endif |
789fc0ad SAMJ |
194 | } |
195 | ||
00b3b3e6 | 196 | /* Enable SW_WD_TRG */ |
789fc0ad | 197 | |
7ccdb946 | 198 | static inline void pc87413_enable_sw_wd_trg(void) |
789fc0ad | 199 | { |
789fc0ad | 200 | /* Enable SW_WD_TRG */ |
aee334c2 | 201 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
00b3b3e6 | 202 | #ifdef DEBUG |
27c766aa | 203 | pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n"); |
00b3b3e6 | 204 | #endif |
789fc0ad SAMJ |
205 | } |
206 | ||
00b3b3e6 | 207 | /* Disable SW_WD_TRG */ |
789fc0ad | 208 | |
7ccdb946 | 209 | static inline void pc87413_disable_sw_wd_trg(void) |
00b3b3e6 | 210 | { |
789fc0ad | 211 | /* Disable SW_WD_TRG */ |
aee334c2 | 212 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
00b3b3e6 | 213 | #ifdef DEBUG |
27c766aa | 214 | pr_info(DPFX "Disable SW_WD_TRG\n"); |
00b3b3e6 | 215 | #endif |
789fc0ad SAMJ |
216 | } |
217 | ||
00b3b3e6 | 218 | /* -- Higher level functions ------------------------------------*/ |
789fc0ad | 219 | |
00b3b3e6 | 220 | /* Enable the watchdog */ |
789fc0ad | 221 | |
00b3b3e6 | 222 | static void pc87413_enable(void) |
789fc0ad | 223 | { |
00b3b3e6 | 224 | spin_lock(&io_lock); |
789fc0ad | 225 | |
7ccdb946 JM |
226 | pc87413_swc_bank3(); |
227 | pc87413_programm_wdto(timeout); | |
228 | pc87413_enable_wden(); | |
229 | pc87413_enable_sw_wd_tren(); | |
230 | pc87413_enable_sw_wd_trg(); | |
00b3b3e6 SAMJ |
231 | |
232 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
233 | } |
234 | ||
00b3b3e6 | 235 | /* Disable the watchdog */ |
789fc0ad | 236 | |
00b3b3e6 | 237 | static void pc87413_disable(void) |
789fc0ad | 238 | { |
00b3b3e6 | 239 | spin_lock(&io_lock); |
789fc0ad | 240 | |
7ccdb946 JM |
241 | pc87413_swc_bank3(); |
242 | pc87413_disable_sw_wd_tren(); | |
243 | pc87413_disable_sw_wd_trg(); | |
244 | pc87413_programm_wdto(0); | |
00b3b3e6 SAMJ |
245 | |
246 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
247 | } |
248 | ||
00b3b3e6 | 249 | /* Refresh the watchdog */ |
789fc0ad | 250 | |
00b3b3e6 | 251 | static void pc87413_refresh(void) |
789fc0ad | 252 | { |
00b3b3e6 | 253 | spin_lock(&io_lock); |
789fc0ad | 254 | |
7ccdb946 JM |
255 | pc87413_swc_bank3(); |
256 | pc87413_disable_sw_wd_tren(); | |
257 | pc87413_disable_sw_wd_trg(); | |
258 | pc87413_programm_wdto(timeout); | |
259 | pc87413_enable_wden(); | |
260 | pc87413_enable_sw_wd_tren(); | |
261 | pc87413_enable_sw_wd_trg(); | |
789fc0ad | 262 | |
00b3b3e6 | 263 | spin_unlock(&io_lock); |
789fc0ad SAMJ |
264 | } |
265 | ||
00b3b3e6 SAMJ |
266 | /* -- File operations -------------------------------------------*/ |
267 | ||
268 | /** | |
269 | * pc87413_open: | |
270 | * @inode: inode of device | |
271 | * @file: file handle to device | |
272 | * | |
273 | */ | |
274 | ||
275 | static int pc87413_open(struct inode *inode, struct file *file) | |
276 | { | |
277 | /* /dev/watchdog can only be opened once */ | |
278 | ||
279 | if (test_and_set_bit(0, &timer_enabled)) | |
280 | return -EBUSY; | |
281 | ||
282 | if (nowayout) | |
283 | __module_get(THIS_MODULE); | |
789fc0ad | 284 | |
00b3b3e6 SAMJ |
285 | /* Reload and activate timer */ |
286 | pc87413_refresh(); | |
789fc0ad | 287 | |
27c766aa | 288 | pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout); |
00b3b3e6 SAMJ |
289 | |
290 | return nonseekable_open(inode, file); | |
291 | } | |
789fc0ad SAMJ |
292 | |
293 | /** | |
00b3b3e6 SAMJ |
294 | * pc87413_release: |
295 | * @inode: inode to board | |
296 | * @file: file handle to board | |
789fc0ad | 297 | * |
00b3b3e6 SAMJ |
298 | * The watchdog has a configurable API. There is a religious dispute |
299 | * between people who want their watchdog to be able to shut down and | |
300 | * those who want to be sure if the watchdog manager dies the machine | |
301 | * reboots. In the former case we disable the counters, in the latter | |
302 | * case you have to open it again very soon. | |
789fc0ad SAMJ |
303 | */ |
304 | ||
00b3b3e6 | 305 | static int pc87413_release(struct inode *inode, struct file *file) |
789fc0ad | 306 | { |
00b3b3e6 SAMJ |
307 | /* Shut off the timer. */ |
308 | ||
309 | if (expect_close == 42) { | |
310 | pc87413_disable(); | |
27c766aa | 311 | pr_info("Watchdog disabled, sleeping again...\n"); |
00b3b3e6 | 312 | } else { |
27c766aa | 313 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
00b3b3e6 SAMJ |
314 | pc87413_refresh(); |
315 | } | |
00b3b3e6 SAMJ |
316 | clear_bit(0, &timer_enabled); |
317 | expect_close = 0; | |
00b3b3e6 | 318 | return 0; |
789fc0ad SAMJ |
319 | } |
320 | ||
00b3b3e6 SAMJ |
321 | /** |
322 | * pc87413_status: | |
323 | * | |
324 | * return, if the watchdog is enabled (timeout is set...) | |
325 | */ | |
326 | ||
327 | ||
328 | static int pc87413_status(void) | |
789fc0ad | 329 | { |
0835caa2 | 330 | return 0; /* currently not supported */ |
789fc0ad SAMJ |
331 | } |
332 | ||
333 | /** | |
334 | * pc87413_write: | |
335 | * @file: file handle to the watchdog | |
00b3b3e6 SAMJ |
336 | * @data: data buffer to write |
337 | * @len: length in bytes | |
789fc0ad SAMJ |
338 | * @ppos: pointer to the position to write. No seeks allowed |
339 | * | |
340 | * A write to a watchdog device is defined as a keepalive signal. Any | |
341 | * write of data will do, as we we don't define content meaning. | |
342 | */ | |
343 | ||
00b3b3e6 SAMJ |
344 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
345 | size_t len, loff_t *ppos) | |
789fc0ad | 346 | { |
00b3b3e6 SAMJ |
347 | /* See if we got the magic character 'V' and reload the timer */ |
348 | if (len) { | |
349 | if (!nowayout) { | |
350 | size_t i; | |
351 | ||
352 | /* reset expect flag */ | |
353 | expect_close = 0; | |
354 | ||
aee334c2 AC |
355 | /* scan to see whether or not we got the |
356 | magic character */ | |
00b3b3e6 SAMJ |
357 | for (i = 0; i != len; i++) { |
358 | char c; | |
7944d3a5 | 359 | if (get_user(c, data + i)) |
00b3b3e6 SAMJ |
360 | return -EFAULT; |
361 | if (c == 'V') | |
362 | expect_close = 42; | |
363 | } | |
364 | } | |
365 | ||
366 | /* someone wrote to us, we should reload the timer */ | |
367 | pc87413_refresh(); | |
789fc0ad | 368 | } |
00b3b3e6 | 369 | return len; |
789fc0ad SAMJ |
370 | } |
371 | ||
00b3b3e6 | 372 | /** |
789fc0ad | 373 | * pc87413_ioctl: |
789fc0ad SAMJ |
374 | * @file: file handle to the device |
375 | * @cmd: watchdog command | |
376 | * @arg: argument pointer | |
377 | * | |
378 | * The watchdog API defines a common set of functions for all watchdogs | |
379 | * according to their available features. We only actually usefully support | |
380 | * querying capabilities and current status. | |
381 | */ | |
382 | ||
aee334c2 AC |
383 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
384 | unsigned long arg) | |
789fc0ad | 385 | { |
00b3b3e6 SAMJ |
386 | int new_timeout; |
387 | ||
388 | union { | |
389 | struct watchdog_info __user *ident; | |
390 | int __user *i; | |
391 | } uarg; | |
392 | ||
42747d71 | 393 | static const struct watchdog_info ident = { |
00b3b3e6 | 394 | .options = WDIOF_KEEPALIVEPING | |
aee334c2 AC |
395 | WDIOF_SETTIMEOUT | |
396 | WDIOF_MAGICCLOSE, | |
00b3b3e6 | 397 | .firmware_version = 1, |
7944d3a5 | 398 | .identity = "PC87413(HF/F) watchdog", |
789fc0ad SAMJ |
399 | }; |
400 | ||
00b3b3e6 | 401 | uarg.i = (int __user *)arg; |
789fc0ad | 402 | |
aee334c2 AC |
403 | switch (cmd) { |
404 | case WDIOC_GETSUPPORT: | |
405 | return copy_to_user(uarg.ident, &ident, | |
406 | sizeof(ident)) ? -EFAULT : 0; | |
407 | case WDIOC_GETSTATUS: | |
408 | return put_user(pc87413_status(), uarg.i); | |
409 | case WDIOC_GETBOOTSTATUS: | |
410 | return put_user(0, uarg.i); | |
0c06090c WVS |
411 | case WDIOC_SETOPTIONS: |
412 | { | |
413 | int options, retval = -EINVAL; | |
414 | if (get_user(options, uarg.i)) | |
415 | return -EFAULT; | |
416 | if (options & WDIOS_DISABLECARD) { | |
417 | pc87413_disable(); | |
418 | retval = 0; | |
419 | } | |
420 | if (options & WDIOS_ENABLECARD) { | |
421 | pc87413_enable(); | |
422 | retval = 0; | |
423 | } | |
424 | return retval; | |
425 | } | |
aee334c2 AC |
426 | case WDIOC_KEEPALIVE: |
427 | pc87413_refresh(); | |
00b3b3e6 | 428 | #ifdef DEBUG |
27c766aa | 429 | pr_info(DPFX "keepalive\n"); |
00b3b3e6 | 430 | #endif |
aee334c2 AC |
431 | return 0; |
432 | case WDIOC_SETTIMEOUT: | |
433 | if (get_user(new_timeout, uarg.i)) | |
434 | return -EFAULT; | |
435 | /* the API states this is given in secs */ | |
436 | new_timeout /= 60; | |
437 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
438 | return -EINVAL; | |
439 | timeout = new_timeout; | |
440 | pc87413_refresh(); | |
441 | /* fall through and return the new timeout... */ | |
442 | case WDIOC_GETTIMEOUT: | |
443 | new_timeout = timeout * 60; | |
444 | return put_user(new_timeout, uarg.i); | |
aee334c2 AC |
445 | default: |
446 | return -ENOTTY; | |
789fc0ad | 447 | } |
789fc0ad SAMJ |
448 | } |
449 | ||
00b3b3e6 SAMJ |
450 | /* -- Notifier funtions -----------------------------------------*/ |
451 | ||
789fc0ad SAMJ |
452 | /** |
453 | * notify_sys: | |
454 | * @this: our notifier block | |
455 | * @code: the event being reported | |
456 | * @unused: unused | |
457 | * | |
458 | * Our notifier is called on system shutdowns. We want to turn the card | |
459 | * off at reboot otherwise the machine will reboot again during memory | |
460 | * test or worse yet during the following fsck. This would suck, in fact | |
461 | * trust me - if it happens it does suck. | |
462 | */ | |
463 | ||
00b3b3e6 SAMJ |
464 | static int pc87413_notify_sys(struct notifier_block *this, |
465 | unsigned long code, | |
466 | void *unused) | |
789fc0ad | 467 | { |
00b3b3e6 | 468 | if (code == SYS_DOWN || code == SYS_HALT) |
789fc0ad SAMJ |
469 | /* Turn the card off */ |
470 | pc87413_disable(); | |
789fc0ad SAMJ |
471 | return NOTIFY_DONE; |
472 | } | |
473 | ||
00b3b3e6 | 474 | /* -- Module's structures ---------------------------------------*/ |
789fc0ad | 475 | |
2b8693c0 | 476 | static const struct file_operations pc87413_fops = { |
789fc0ad | 477 | .owner = THIS_MODULE, |
00b3b3e6 | 478 | .llseek = no_llseek, |
789fc0ad | 479 | .write = pc87413_write, |
aee334c2 | 480 | .unlocked_ioctl = pc87413_ioctl, |
789fc0ad SAMJ |
481 | .open = pc87413_open, |
482 | .release = pc87413_release, | |
483 | }; | |
484 | ||
aee334c2 | 485 | static struct notifier_block pc87413_notifier = { |
00b3b3e6 | 486 | .notifier_call = pc87413_notify_sys, |
789fc0ad SAMJ |
487 | }; |
488 | ||
aee334c2 | 489 | static struct miscdevice pc87413_miscdev = { |
00b3b3e6 SAMJ |
490 | .minor = WATCHDOG_MINOR, |
491 | .name = "watchdog", | |
7944d3a5 | 492 | .fops = &pc87413_fops, |
789fc0ad SAMJ |
493 | }; |
494 | ||
00b3b3e6 | 495 | /* -- Module init functions -------------------------------------*/ |
789fc0ad SAMJ |
496 | |
497 | /** | |
5f3b2756 | 498 | * pc87413_init: module's "constructor" |
789fc0ad SAMJ |
499 | * |
500 | * Set up the WDT watchdog board. All we have to do is grab the | |
501 | * resources we require and bitch if anyone beat us to them. | |
502 | * The open() function will actually kick the board off. | |
503 | */ | |
504 | ||
00b3b3e6 | 505 | static int __init pc87413_init(void) |
789fc0ad SAMJ |
506 | { |
507 | int ret; | |
508 | ||
27c766aa | 509 | pr_info("Version " VERSION " at io 0x%X\n", |
aee334c2 | 510 | WDT_INDEX_IO_PORT); |
789fc0ad | 511 | |
7ccdb946 JM |
512 | if (!request_muxed_region(io, 2, MODNAME)) |
513 | return -EBUSY; | |
789fc0ad | 514 | |
789fc0ad SAMJ |
515 | ret = register_reboot_notifier(&pc87413_notifier); |
516 | if (ret != 0) { | |
27c766aa | 517 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
789fc0ad SAMJ |
518 | } |
519 | ||
789fc0ad | 520 | ret = misc_register(&pc87413_miscdev); |
789fc0ad | 521 | if (ret != 0) { |
27c766aa JP |
522 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
523 | WATCHDOG_MINOR, ret); | |
7ccdb946 | 524 | goto reboot_unreg; |
789fc0ad | 525 | } |
27c766aa | 526 | pr_info("initialized. timeout=%d min\n", timeout); |
7ccdb946 JM |
527 | |
528 | pc87413_select_wdt_out(); | |
529 | pc87413_enable_swc(); | |
530 | pc87413_get_swc_base_addr(); | |
531 | ||
532 | if (!request_region(swc_base_addr, 0x20, MODNAME)) { | |
27c766aa | 533 | pr_err("cannot request SWC region at 0x%x\n", swc_base_addr); |
7ccdb946 JM |
534 | ret = -EBUSY; |
535 | goto misc_unreg; | |
536 | } | |
537 | ||
00b3b3e6 | 538 | pc87413_enable(); |
7ccdb946 JM |
539 | |
540 | release_region(io, 2); | |
789fc0ad | 541 | return 0; |
7ccdb946 JM |
542 | |
543 | misc_unreg: | |
544 | misc_deregister(&pc87413_miscdev); | |
545 | reboot_unreg: | |
546 | unregister_reboot_notifier(&pc87413_notifier); | |
547 | release_region(io, 2); | |
548 | return ret; | |
789fc0ad SAMJ |
549 | } |
550 | ||
00b3b3e6 SAMJ |
551 | /** |
552 | * pc87413_exit: module's "destructor" | |
553 | * | |
554 | * Unload the watchdog. You cannot do this with any file handles open. | |
555 | * If your watchdog is set to continue ticking on close and you unload | |
556 | * it, well it keeps ticking. We won't get the interrupt but the board | |
557 | * will not touch PC memory so all is fine. You just have to load a new | |
558 | * module in 60 seconds or reboot. | |
559 | */ | |
560 | ||
561 | static void __exit pc87413_exit(void) | |
562 | { | |
563 | /* Stop the timer before we leave */ | |
aee334c2 | 564 | if (!nowayout) { |
00b3b3e6 | 565 | pc87413_disable(); |
27c766aa | 566 | pr_info("Watchdog disabled\n"); |
00b3b3e6 SAMJ |
567 | } |
568 | ||
569 | misc_deregister(&pc87413_miscdev); | |
570 | unregister_reboot_notifier(&pc87413_notifier); | |
7ccdb946 | 571 | release_region(swc_base_addr, 0x20); |
00b3b3e6 | 572 | |
27c766aa | 573 | pr_info("watchdog component driver removed\n"); |
00b3b3e6 | 574 | } |
789fc0ad SAMJ |
575 | |
576 | module_init(pc87413_init); | |
577 | module_exit(pc87413_exit); | |
578 | ||
143a2e54 WVS |
579 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>, " |
580 | "Marcus Junker <junker@anduras.de>,"); | |
789fc0ad | 581 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
00b3b3e6 SAMJ |
582 | MODULE_LICENSE("GPL"); |
583 | ||
789fc0ad SAMJ |
584 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
585 | ||
00b3b3e6 | 586 | module_param(io, int, 0); |
76550d32 RD |
587 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " |
588 | __MODULE_STRING(IO_DEFAULT) ")."); | |
00b3b3e6 SAMJ |
589 | |
590 | module_param(timeout, int, 0); | |
aee334c2 AC |
591 | MODULE_PARM_DESC(timeout, |
592 | "Watchdog timeout in minutes (default=" | |
76550d32 | 593 | __MODULE_STRING(DEFAULT_TIMEOUT) ")."); |
00b3b3e6 SAMJ |
594 | |
595 | module_param(nowayout, int, 0); | |
aee334c2 AC |
596 | MODULE_PARM_DESC(nowayout, |
597 | "Watchdog cannot be stopped once started (default=" | |
598 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
00b3b3e6 | 599 |