Commit | Line | Data |
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d0173278 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
789fc0ad SAMJ |
2 | /* |
3 | * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x | |
4 | * | |
00b3b3e6 | 5 | * This code is based on wdt.c with original copyright. |
789fc0ad | 6 | * |
00b3b3e6 SAMJ |
7 | * (C) Copyright 2006 Sven Anders, <anders@anduras.de> |
8 | * and Marcus Junker, <junker@anduras.de> | |
789fc0ad | 9 | * |
00b3b3e6 | 10 | * Neither Sven Anders, Marcus Junker nor ANDURAS AG |
789fc0ad SAMJ |
11 | * admit liability nor provide warranty for any of this software. |
12 | * This material is provided "AS-IS" and at no charge. | |
13 | * | |
00b3b3e6 | 14 | * Release 1.1 |
789fc0ad SAMJ |
15 | */ |
16 | ||
27c766aa JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
789fc0ad SAMJ |
19 | #include <linux/module.h> |
20 | #include <linux/types.h> | |
21 | #include <linux/miscdevice.h> | |
22 | #include <linux/watchdog.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/notifier.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/reboot.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/moduleparam.h> | |
aee334c2 AC |
31 | #include <linux/io.h> |
32 | #include <linux/uaccess.h> | |
789fc0ad | 33 | |
789fc0ad | 34 | |
00b3b3e6 | 35 | /* #define DEBUG 1 */ |
789fc0ad | 36 | |
7944d3a5 | 37 | #define DEFAULT_TIMEOUT 1 /* 1 minute */ |
00b3b3e6 | 38 | #define MAX_TIMEOUT 255 |
789fc0ad | 39 | |
00b3b3e6 SAMJ |
40 | #define VERSION "1.1" |
41 | #define MODNAME "pc87413 WDT" | |
00b3b3e6 | 42 | #define DPFX MODNAME " - DEBUG: " |
789fc0ad | 43 | |
7944d3a5 | 44 | #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ |
00b3b3e6 SAMJ |
45 | #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) |
46 | #define SWC_LDN 0x04 | |
7944d3a5 | 47 | #define SIOCFG2 0x22 /* Serial IO register */ |
25985edc | 48 | #define WDCTL 0x10 /* Watchdog-Timer-Control-Register */ |
7944d3a5 WVS |
49 | #define WDTO 0x11 /* Watchdog timeout register */ |
50 | #define WDCFG 0x12 /* Watchdog config register */ | |
789fc0ad | 51 | |
76550d32 RD |
52 | #define IO_DEFAULT 0x2E /* Address used on Portwell Boards */ |
53 | ||
54 | static int io = IO_DEFAULT; | |
7ccdb946 | 55 | static int swc_base_addr = -1; |
789fc0ad | 56 | |
7944d3a5 | 57 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
aee334c2 | 58 | static unsigned long timer_enabled; /* is the timer enabled? */ |
789fc0ad | 59 | |
aee334c2 | 60 | static char expect_close; /* is the close expected? */ |
789fc0ad | 61 | |
aee334c2 | 62 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
789fc0ad | 63 | |
86a1e189 | 64 | static bool nowayout = WATCHDOG_NOWAYOUT; |
789fc0ad | 65 | |
00b3b3e6 | 66 | /* -- Low level function ----------------------------------------*/ |
789fc0ad | 67 | |
00b3b3e6 | 68 | /* Select pins for Watchdog output */ |
789fc0ad | 69 | |
aee334c2 | 70 | static inline void pc87413_select_wdt_out(void) |
789fc0ad | 71 | { |
00b3b3e6 | 72 | unsigned int cr_data = 0; |
789fc0ad | 73 | |
00b3b3e6 | 74 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
789fc0ad SAMJ |
75 | |
76 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
77 | ||
aee334c2 | 78 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
79 | |
80 | cr_data |= 0x80; /* Set Bit7 to 1*/ | |
81 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
82 | ||
83 | outb_p(cr_data, WDT_DATA_IO_PORT); | |
84 | ||
00b3b3e6 | 85 | #ifdef DEBUG |
27c766aa | 86 | pr_info(DPFX |
aee334c2 AC |
87 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", |
88 | cr_data); | |
00b3b3e6 | 89 | #endif |
789fc0ad SAMJ |
90 | } |
91 | ||
00b3b3e6 | 92 | /* Enable SWC functions */ |
789fc0ad | 93 | |
00b3b3e6 SAMJ |
94 | static inline void pc87413_enable_swc(void) |
95 | { | |
aee334c2 | 96 | unsigned int cr_data = 0; |
789fc0ad SAMJ |
97 | |
98 | /* Step 2: Enable SWC functions */ | |
99 | ||
7944d3a5 | 100 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ |
789fc0ad SAMJ |
101 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); |
102 | ||
7944d3a5 | 103 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ |
00b3b3e6 | 104 | cr_data = inb(WDT_DATA_IO_PORT); |
7944d3a5 | 105 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
789fc0ad | 106 | outb_p(0x30, WDT_INDEX_IO_PORT); |
7944d3a5 | 107 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ |
789fc0ad | 108 | |
00b3b3e6 | 109 | #ifdef DEBUG |
27c766aa | 110 | pr_info(DPFX "pc87413 - Enable SWC functions\n"); |
00b3b3e6 | 111 | #endif |
789fc0ad SAMJ |
112 | } |
113 | ||
00b3b3e6 SAMJ |
114 | /* Read SWC I/O base address */ |
115 | ||
7ccdb946 | 116 | static void pc87413_get_swc_base_addr(void) |
789fc0ad | 117 | { |
00b3b3e6 | 118 | unsigned char addr_l, addr_h = 0; |
789fc0ad SAMJ |
119 | |
120 | /* Step 3: Read SWC I/O Base Address */ | |
121 | ||
7944d3a5 | 122 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ |
00b3b3e6 | 123 | addr_h = inb(WDT_DATA_IO_PORT); |
789fc0ad | 124 | |
7944d3a5 | 125 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ |
789fc0ad | 126 | |
00b3b3e6 | 127 | addr_l = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
128 | |
129 | swc_base_addr = (addr_h << 8) + addr_l; | |
00b3b3e6 | 130 | #ifdef DEBUG |
27c766aa | 131 | pr_info(DPFX |
aee334c2 AC |
132 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", |
133 | addr_l, addr_h, swc_base_addr); | |
00b3b3e6 | 134 | #endif |
789fc0ad SAMJ |
135 | } |
136 | ||
00b3b3e6 SAMJ |
137 | /* Select Bank 3 of SWC */ |
138 | ||
7ccdb946 | 139 | static inline void pc87413_swc_bank3(void) |
789fc0ad SAMJ |
140 | { |
141 | /* Step 4: Select Bank3 of SWC */ | |
00b3b3e6 | 142 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
00b3b3e6 | 143 | #ifdef DEBUG |
27c766aa | 144 | pr_info(DPFX "Select Bank3 of SWC\n"); |
00b3b3e6 | 145 | #endif |
789fc0ad SAMJ |
146 | } |
147 | ||
00b3b3e6 SAMJ |
148 | /* Set watchdog timeout to x minutes */ |
149 | ||
7ccdb946 | 150 | static inline void pc87413_programm_wdto(char pc87413_time) |
789fc0ad SAMJ |
151 | { |
152 | /* Step 5: Programm WDTO, Twd. */ | |
00b3b3e6 | 153 | outb_p(pc87413_time, swc_base_addr + WDTO); |
00b3b3e6 | 154 | #ifdef DEBUG |
27c766aa | 155 | pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time); |
00b3b3e6 | 156 | #endif |
789fc0ad SAMJ |
157 | } |
158 | ||
00b3b3e6 SAMJ |
159 | /* Enable WDEN */ |
160 | ||
7ccdb946 | 161 | static inline void pc87413_enable_wden(void) |
789fc0ad SAMJ |
162 | { |
163 | /* Step 6: Enable WDEN */ | |
aee334c2 | 164 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
00b3b3e6 | 165 | #ifdef DEBUG |
27c766aa | 166 | pr_info(DPFX "Enable WDEN\n"); |
00b3b3e6 | 167 | #endif |
789fc0ad SAMJ |
168 | } |
169 | ||
00b3b3e6 | 170 | /* Enable SW_WD_TREN */ |
7ccdb946 | 171 | static inline void pc87413_enable_sw_wd_tren(void) |
789fc0ad SAMJ |
172 | { |
173 | /* Enable SW_WD_TREN */ | |
aee334c2 | 174 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
00b3b3e6 | 175 | #ifdef DEBUG |
27c766aa | 176 | pr_info(DPFX "Enable SW_WD_TREN\n"); |
00b3b3e6 | 177 | #endif |
789fc0ad SAMJ |
178 | } |
179 | ||
00b3b3e6 SAMJ |
180 | /* Disable SW_WD_TREN */ |
181 | ||
7ccdb946 | 182 | static inline void pc87413_disable_sw_wd_tren(void) |
789fc0ad SAMJ |
183 | { |
184 | /* Disable SW_WD_TREN */ | |
aee334c2 | 185 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
00b3b3e6 | 186 | #ifdef DEBUG |
27c766aa | 187 | pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n"); |
00b3b3e6 | 188 | #endif |
789fc0ad SAMJ |
189 | } |
190 | ||
00b3b3e6 | 191 | /* Enable SW_WD_TRG */ |
789fc0ad | 192 | |
7ccdb946 | 193 | static inline void pc87413_enable_sw_wd_trg(void) |
789fc0ad | 194 | { |
789fc0ad | 195 | /* Enable SW_WD_TRG */ |
aee334c2 | 196 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
00b3b3e6 | 197 | #ifdef DEBUG |
27c766aa | 198 | pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n"); |
00b3b3e6 | 199 | #endif |
789fc0ad SAMJ |
200 | } |
201 | ||
00b3b3e6 | 202 | /* Disable SW_WD_TRG */ |
789fc0ad | 203 | |
7ccdb946 | 204 | static inline void pc87413_disable_sw_wd_trg(void) |
00b3b3e6 | 205 | { |
789fc0ad | 206 | /* Disable SW_WD_TRG */ |
aee334c2 | 207 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
00b3b3e6 | 208 | #ifdef DEBUG |
27c766aa | 209 | pr_info(DPFX "Disable SW_WD_TRG\n"); |
00b3b3e6 | 210 | #endif |
789fc0ad SAMJ |
211 | } |
212 | ||
00b3b3e6 | 213 | /* -- Higher level functions ------------------------------------*/ |
789fc0ad | 214 | |
00b3b3e6 | 215 | /* Enable the watchdog */ |
789fc0ad | 216 | |
00b3b3e6 | 217 | static void pc87413_enable(void) |
789fc0ad | 218 | { |
00b3b3e6 | 219 | spin_lock(&io_lock); |
789fc0ad | 220 | |
7ccdb946 JM |
221 | pc87413_swc_bank3(); |
222 | pc87413_programm_wdto(timeout); | |
223 | pc87413_enable_wden(); | |
224 | pc87413_enable_sw_wd_tren(); | |
225 | pc87413_enable_sw_wd_trg(); | |
00b3b3e6 SAMJ |
226 | |
227 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
228 | } |
229 | ||
00b3b3e6 | 230 | /* Disable the watchdog */ |
789fc0ad | 231 | |
00b3b3e6 | 232 | static void pc87413_disable(void) |
789fc0ad | 233 | { |
00b3b3e6 | 234 | spin_lock(&io_lock); |
789fc0ad | 235 | |
7ccdb946 JM |
236 | pc87413_swc_bank3(); |
237 | pc87413_disable_sw_wd_tren(); | |
238 | pc87413_disable_sw_wd_trg(); | |
239 | pc87413_programm_wdto(0); | |
00b3b3e6 SAMJ |
240 | |
241 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
242 | } |
243 | ||
00b3b3e6 | 244 | /* Refresh the watchdog */ |
789fc0ad | 245 | |
00b3b3e6 | 246 | static void pc87413_refresh(void) |
789fc0ad | 247 | { |
00b3b3e6 | 248 | spin_lock(&io_lock); |
789fc0ad | 249 | |
7ccdb946 JM |
250 | pc87413_swc_bank3(); |
251 | pc87413_disable_sw_wd_tren(); | |
252 | pc87413_disable_sw_wd_trg(); | |
253 | pc87413_programm_wdto(timeout); | |
254 | pc87413_enable_wden(); | |
255 | pc87413_enable_sw_wd_tren(); | |
256 | pc87413_enable_sw_wd_trg(); | |
789fc0ad | 257 | |
00b3b3e6 | 258 | spin_unlock(&io_lock); |
789fc0ad SAMJ |
259 | } |
260 | ||
00b3b3e6 SAMJ |
261 | /* -- File operations -------------------------------------------*/ |
262 | ||
263 | /** | |
264 | * pc87413_open: | |
265 | * @inode: inode of device | |
266 | * @file: file handle to device | |
267 | * | |
268 | */ | |
269 | ||
270 | static int pc87413_open(struct inode *inode, struct file *file) | |
271 | { | |
272 | /* /dev/watchdog can only be opened once */ | |
273 | ||
274 | if (test_and_set_bit(0, &timer_enabled)) | |
275 | return -EBUSY; | |
276 | ||
277 | if (nowayout) | |
278 | __module_get(THIS_MODULE); | |
789fc0ad | 279 | |
00b3b3e6 SAMJ |
280 | /* Reload and activate timer */ |
281 | pc87413_refresh(); | |
789fc0ad | 282 | |
27c766aa | 283 | pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout); |
00b3b3e6 | 284 | |
c5bf68fe | 285 | return stream_open(inode, file); |
00b3b3e6 | 286 | } |
789fc0ad SAMJ |
287 | |
288 | /** | |
00b3b3e6 SAMJ |
289 | * pc87413_release: |
290 | * @inode: inode to board | |
291 | * @file: file handle to board | |
789fc0ad | 292 | * |
00b3b3e6 SAMJ |
293 | * The watchdog has a configurable API. There is a religious dispute |
294 | * between people who want their watchdog to be able to shut down and | |
295 | * those who want to be sure if the watchdog manager dies the machine | |
296 | * reboots. In the former case we disable the counters, in the latter | |
297 | * case you have to open it again very soon. | |
789fc0ad SAMJ |
298 | */ |
299 | ||
00b3b3e6 | 300 | static int pc87413_release(struct inode *inode, struct file *file) |
789fc0ad | 301 | { |
00b3b3e6 SAMJ |
302 | /* Shut off the timer. */ |
303 | ||
304 | if (expect_close == 42) { | |
305 | pc87413_disable(); | |
27c766aa | 306 | pr_info("Watchdog disabled, sleeping again...\n"); |
00b3b3e6 | 307 | } else { |
27c766aa | 308 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
00b3b3e6 SAMJ |
309 | pc87413_refresh(); |
310 | } | |
00b3b3e6 SAMJ |
311 | clear_bit(0, &timer_enabled); |
312 | expect_close = 0; | |
00b3b3e6 | 313 | return 0; |
789fc0ad SAMJ |
314 | } |
315 | ||
00b3b3e6 SAMJ |
316 | /** |
317 | * pc87413_status: | |
318 | * | |
319 | * return, if the watchdog is enabled (timeout is set...) | |
320 | */ | |
321 | ||
322 | ||
323 | static int pc87413_status(void) | |
789fc0ad | 324 | { |
0835caa2 | 325 | return 0; /* currently not supported */ |
789fc0ad SAMJ |
326 | } |
327 | ||
328 | /** | |
329 | * pc87413_write: | |
330 | * @file: file handle to the watchdog | |
00b3b3e6 SAMJ |
331 | * @data: data buffer to write |
332 | * @len: length in bytes | |
789fc0ad SAMJ |
333 | * @ppos: pointer to the position to write. No seeks allowed |
334 | * | |
335 | * A write to a watchdog device is defined as a keepalive signal. Any | |
336 | * write of data will do, as we we don't define content meaning. | |
337 | */ | |
338 | ||
00b3b3e6 SAMJ |
339 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
340 | size_t len, loff_t *ppos) | |
789fc0ad | 341 | { |
00b3b3e6 SAMJ |
342 | /* See if we got the magic character 'V' and reload the timer */ |
343 | if (len) { | |
344 | if (!nowayout) { | |
345 | size_t i; | |
346 | ||
347 | /* reset expect flag */ | |
348 | expect_close = 0; | |
349 | ||
aee334c2 AC |
350 | /* scan to see whether or not we got the |
351 | magic character */ | |
00b3b3e6 SAMJ |
352 | for (i = 0; i != len; i++) { |
353 | char c; | |
7944d3a5 | 354 | if (get_user(c, data + i)) |
00b3b3e6 SAMJ |
355 | return -EFAULT; |
356 | if (c == 'V') | |
357 | expect_close = 42; | |
358 | } | |
359 | } | |
360 | ||
361 | /* someone wrote to us, we should reload the timer */ | |
362 | pc87413_refresh(); | |
789fc0ad | 363 | } |
00b3b3e6 | 364 | return len; |
789fc0ad SAMJ |
365 | } |
366 | ||
00b3b3e6 | 367 | /** |
789fc0ad | 368 | * pc87413_ioctl: |
789fc0ad SAMJ |
369 | * @file: file handle to the device |
370 | * @cmd: watchdog command | |
371 | * @arg: argument pointer | |
372 | * | |
373 | * The watchdog API defines a common set of functions for all watchdogs | |
374 | * according to their available features. We only actually usefully support | |
375 | * querying capabilities and current status. | |
376 | */ | |
377 | ||
aee334c2 AC |
378 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
379 | unsigned long arg) | |
789fc0ad | 380 | { |
00b3b3e6 SAMJ |
381 | int new_timeout; |
382 | ||
383 | union { | |
384 | struct watchdog_info __user *ident; | |
385 | int __user *i; | |
386 | } uarg; | |
387 | ||
42747d71 | 388 | static const struct watchdog_info ident = { |
00b3b3e6 | 389 | .options = WDIOF_KEEPALIVEPING | |
aee334c2 AC |
390 | WDIOF_SETTIMEOUT | |
391 | WDIOF_MAGICCLOSE, | |
00b3b3e6 | 392 | .firmware_version = 1, |
7944d3a5 | 393 | .identity = "PC87413(HF/F) watchdog", |
789fc0ad SAMJ |
394 | }; |
395 | ||
00b3b3e6 | 396 | uarg.i = (int __user *)arg; |
789fc0ad | 397 | |
aee334c2 AC |
398 | switch (cmd) { |
399 | case WDIOC_GETSUPPORT: | |
400 | return copy_to_user(uarg.ident, &ident, | |
401 | sizeof(ident)) ? -EFAULT : 0; | |
402 | case WDIOC_GETSTATUS: | |
403 | return put_user(pc87413_status(), uarg.i); | |
404 | case WDIOC_GETBOOTSTATUS: | |
405 | return put_user(0, uarg.i); | |
0c06090c WVS |
406 | case WDIOC_SETOPTIONS: |
407 | { | |
408 | int options, retval = -EINVAL; | |
409 | if (get_user(options, uarg.i)) | |
410 | return -EFAULT; | |
411 | if (options & WDIOS_DISABLECARD) { | |
412 | pc87413_disable(); | |
413 | retval = 0; | |
414 | } | |
415 | if (options & WDIOS_ENABLECARD) { | |
416 | pc87413_enable(); | |
417 | retval = 0; | |
418 | } | |
419 | return retval; | |
420 | } | |
aee334c2 AC |
421 | case WDIOC_KEEPALIVE: |
422 | pc87413_refresh(); | |
00b3b3e6 | 423 | #ifdef DEBUG |
27c766aa | 424 | pr_info(DPFX "keepalive\n"); |
00b3b3e6 | 425 | #endif |
aee334c2 AC |
426 | return 0; |
427 | case WDIOC_SETTIMEOUT: | |
428 | if (get_user(new_timeout, uarg.i)) | |
429 | return -EFAULT; | |
430 | /* the API states this is given in secs */ | |
431 | new_timeout /= 60; | |
432 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
433 | return -EINVAL; | |
434 | timeout = new_timeout; | |
435 | pc87413_refresh(); | |
bd490f82 | 436 | fallthrough; /* and return the new timeout */ |
aee334c2 AC |
437 | case WDIOC_GETTIMEOUT: |
438 | new_timeout = timeout * 60; | |
439 | return put_user(new_timeout, uarg.i); | |
aee334c2 AC |
440 | default: |
441 | return -ENOTTY; | |
789fc0ad | 442 | } |
789fc0ad SAMJ |
443 | } |
444 | ||
00b3b3e6 SAMJ |
445 | /* -- Notifier funtions -----------------------------------------*/ |
446 | ||
789fc0ad | 447 | /** |
4700df05 | 448 | * pc87413_notify_sys: |
789fc0ad SAMJ |
449 | * @this: our notifier block |
450 | * @code: the event being reported | |
451 | * @unused: unused | |
452 | * | |
453 | * Our notifier is called on system shutdowns. We want to turn the card | |
454 | * off at reboot otherwise the machine will reboot again during memory | |
455 | * test or worse yet during the following fsck. This would suck, in fact | |
456 | * trust me - if it happens it does suck. | |
457 | */ | |
458 | ||
00b3b3e6 SAMJ |
459 | static int pc87413_notify_sys(struct notifier_block *this, |
460 | unsigned long code, | |
461 | void *unused) | |
789fc0ad | 462 | { |
00b3b3e6 | 463 | if (code == SYS_DOWN || code == SYS_HALT) |
789fc0ad SAMJ |
464 | /* Turn the card off */ |
465 | pc87413_disable(); | |
789fc0ad SAMJ |
466 | return NOTIFY_DONE; |
467 | } | |
468 | ||
00b3b3e6 | 469 | /* -- Module's structures ---------------------------------------*/ |
789fc0ad | 470 | |
2b8693c0 | 471 | static const struct file_operations pc87413_fops = { |
789fc0ad | 472 | .owner = THIS_MODULE, |
00b3b3e6 | 473 | .llseek = no_llseek, |
789fc0ad | 474 | .write = pc87413_write, |
aee334c2 | 475 | .unlocked_ioctl = pc87413_ioctl, |
b6dfb247 | 476 | .compat_ioctl = compat_ptr_ioctl, |
789fc0ad SAMJ |
477 | .open = pc87413_open, |
478 | .release = pc87413_release, | |
479 | }; | |
480 | ||
aee334c2 | 481 | static struct notifier_block pc87413_notifier = { |
00b3b3e6 | 482 | .notifier_call = pc87413_notify_sys, |
789fc0ad SAMJ |
483 | }; |
484 | ||
aee334c2 | 485 | static struct miscdevice pc87413_miscdev = { |
00b3b3e6 SAMJ |
486 | .minor = WATCHDOG_MINOR, |
487 | .name = "watchdog", | |
7944d3a5 | 488 | .fops = &pc87413_fops, |
789fc0ad SAMJ |
489 | }; |
490 | ||
00b3b3e6 | 491 | /* -- Module init functions -------------------------------------*/ |
789fc0ad SAMJ |
492 | |
493 | /** | |
5f3b2756 | 494 | * pc87413_init: module's "constructor" |
789fc0ad SAMJ |
495 | * |
496 | * Set up the WDT watchdog board. All we have to do is grab the | |
497 | * resources we require and bitch if anyone beat us to them. | |
498 | * The open() function will actually kick the board off. | |
499 | */ | |
500 | ||
00b3b3e6 | 501 | static int __init pc87413_init(void) |
789fc0ad SAMJ |
502 | { |
503 | int ret; | |
504 | ||
27c766aa | 505 | pr_info("Version " VERSION " at io 0x%X\n", |
aee334c2 | 506 | WDT_INDEX_IO_PORT); |
789fc0ad | 507 | |
7ccdb946 JM |
508 | if (!request_muxed_region(io, 2, MODNAME)) |
509 | return -EBUSY; | |
789fc0ad | 510 | |
789fc0ad | 511 | ret = register_reboot_notifier(&pc87413_notifier); |
5f5e1909 | 512 | if (ret != 0) |
27c766aa | 513 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
789fc0ad | 514 | |
789fc0ad | 515 | ret = misc_register(&pc87413_miscdev); |
789fc0ad | 516 | if (ret != 0) { |
27c766aa JP |
517 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
518 | WATCHDOG_MINOR, ret); | |
7ccdb946 | 519 | goto reboot_unreg; |
789fc0ad | 520 | } |
27c766aa | 521 | pr_info("initialized. timeout=%d min\n", timeout); |
7ccdb946 JM |
522 | |
523 | pc87413_select_wdt_out(); | |
524 | pc87413_enable_swc(); | |
525 | pc87413_get_swc_base_addr(); | |
526 | ||
527 | if (!request_region(swc_base_addr, 0x20, MODNAME)) { | |
27c766aa | 528 | pr_err("cannot request SWC region at 0x%x\n", swc_base_addr); |
7ccdb946 JM |
529 | ret = -EBUSY; |
530 | goto misc_unreg; | |
531 | } | |
532 | ||
00b3b3e6 | 533 | pc87413_enable(); |
7ccdb946 JM |
534 | |
535 | release_region(io, 2); | |
789fc0ad | 536 | return 0; |
7ccdb946 JM |
537 | |
538 | misc_unreg: | |
539 | misc_deregister(&pc87413_miscdev); | |
540 | reboot_unreg: | |
541 | unregister_reboot_notifier(&pc87413_notifier); | |
542 | release_region(io, 2); | |
543 | return ret; | |
789fc0ad SAMJ |
544 | } |
545 | ||
00b3b3e6 SAMJ |
546 | /** |
547 | * pc87413_exit: module's "destructor" | |
548 | * | |
549 | * Unload the watchdog. You cannot do this with any file handles open. | |
550 | * If your watchdog is set to continue ticking on close and you unload | |
551 | * it, well it keeps ticking. We won't get the interrupt but the board | |
552 | * will not touch PC memory so all is fine. You just have to load a new | |
553 | * module in 60 seconds or reboot. | |
554 | */ | |
555 | ||
556 | static void __exit pc87413_exit(void) | |
557 | { | |
558 | /* Stop the timer before we leave */ | |
aee334c2 | 559 | if (!nowayout) { |
00b3b3e6 | 560 | pc87413_disable(); |
27c766aa | 561 | pr_info("Watchdog disabled\n"); |
00b3b3e6 SAMJ |
562 | } |
563 | ||
564 | misc_deregister(&pc87413_miscdev); | |
565 | unregister_reboot_notifier(&pc87413_notifier); | |
7ccdb946 | 566 | release_region(swc_base_addr, 0x20); |
00b3b3e6 | 567 | |
27c766aa | 568 | pr_info("watchdog component driver removed\n"); |
00b3b3e6 | 569 | } |
789fc0ad SAMJ |
570 | |
571 | module_init(pc87413_init); | |
572 | module_exit(pc87413_exit); | |
573 | ||
5f5e1909 JH |
574 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>"); |
575 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>"); | |
789fc0ad | 576 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
00b3b3e6 SAMJ |
577 | MODULE_LICENSE("GPL"); |
578 | ||
5d1c93ce | 579 | module_param_hw(io, int, ioport, 0); |
76550d32 RD |
580 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " |
581 | __MODULE_STRING(IO_DEFAULT) ")."); | |
00b3b3e6 SAMJ |
582 | |
583 | module_param(timeout, int, 0); | |
aee334c2 AC |
584 | MODULE_PARM_DESC(timeout, |
585 | "Watchdog timeout in minutes (default=" | |
76550d32 | 586 | __MODULE_STRING(DEFAULT_TIMEOUT) ")."); |
00b3b3e6 | 587 | |
86a1e189 | 588 | module_param(nowayout, bool, 0); |
aee334c2 AC |
589 | MODULE_PARM_DESC(nowayout, |
590 | "Watchdog cannot be stopped once started (default=" | |
591 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
00b3b3e6 | 592 |