1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2015 Zodiac Inflight Innovations |
4 | * |
5 | * Author: Martyn Welch <martyn.welch@collabora.co.uk> |
6 | * |
7 | * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>: |
8 | * |
9 | * Copyright (C) Nokia Corporation |
10 | */ |
11 | |
12 | #include <linux/delay.h> |
13 | #include <linux/i2c.h> |
14 | #include <linux/ihex.h> |
15 | #include <linux/firmware.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/sysfs.h> |
20 | #include <linux/types.h> |
21 | #include <linux/watchdog.h> |
22 | |
23 | #include <asm/unaligned.h> |
24 | |
25 | #define ZIIRAVE_TIMEOUT_MIN 3 |
26 | #define ZIIRAVE_TIMEOUT_MAX 255 |
27 | #define ZIIRAVE_TIMEOUT_DEFAULT 30 |
28 | |
29 | #define ZIIRAVE_PING_VALUE 0x0 |
30 | |
31 | #define ZIIRAVE_STATE_INITIAL 0x0 |
32 | #define ZIIRAVE_STATE_OFF 0x1 |
33 | #define ZIIRAVE_STATE_ON 0x2 |
34 | |
35 | #define ZIIRAVE_FW_NAME "ziirave_wdt.fw" |
36 | |
37 | static char *ziirave_reasons[] = {"power cycle" , "hw watchdog" , NULL, NULL, |
38 | "host request" , NULL, "illegal configuration" , |
39 | "illegal instruction" , "illegal trap" , |
40 | "unknown" }; |
41 | |
42 | #define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1 |
43 | #define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3 |
44 | #define ZIIRAVE_WDT_RESET_REASON 0x5 |
45 | #define ZIIRAVE_WDT_STATE 0x6 |
46 | #define ZIIRAVE_WDT_TIMEOUT 0x7 |
47 | #define ZIIRAVE_WDT_TIME_LEFT 0x8 |
48 | #define ZIIRAVE_WDT_PING 0x9 |
49 | #define ZIIRAVE_WDT_RESET_DURATION 0xa |
50 | |
51 | #define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20 |
52 | #define ZIIRAVE_FIRM_PKT_DATA_SIZE 16 |
53 | #define ZIIRAVE_FIRM_FLASH_MEMORY_START (2 * 0x1600) |
54 | #define ZIIRAVE_FIRM_FLASH_MEMORY_END (2 * 0x2bbf) |
55 | #define ZIIRAVE_FIRM_PAGE_SIZE 128 |
56 | |
57 | /* Received and ready for next Download packet. */ |
58 | #define ZIIRAVE_FIRM_DOWNLOAD_ACK 1 |
59 | |
60 | /* Firmware commands */ |
61 | #define ZIIRAVE_CMD_DOWNLOAD_START 0x10 |
62 | #define ZIIRAVE_CMD_DOWNLOAD_END 0x11 |
63 | #define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12 |
64 | #define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13 |
65 | #define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b |
66 | #define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c |
67 | #define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e |
68 | |
69 | #define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC 1 |
70 | #define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC 1 |
71 | |
72 | struct ziirave_wdt_rev { |
73 | unsigned char major; |
74 | unsigned char minor; |
75 | }; |
76 | |
77 | struct ziirave_wdt_data { |
78 | struct mutex sysfs_mutex; |
79 | struct watchdog_device wdd; |
80 | struct ziirave_wdt_rev bootloader_rev; |
81 | struct ziirave_wdt_rev firmware_rev; |
82 | int reset_reason; |
83 | }; |
84 | |
85 | static int wdt_timeout; |
86 | module_param(wdt_timeout, int, 0); |
87 | MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds" ); |
88 | |
89 | static int reset_duration; |
90 | module_param(reset_duration, int, 0); |
91 | MODULE_PARM_DESC(reset_duration, |
92 | "Watchdog reset pulse duration in milliseconds" ); |
93 | |
94 | static bool nowayout = WATCHDOG_NOWAYOUT; |
95 | module_param(nowayout, bool, 0); |
96 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default=" |
97 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")" ); |
98 | |
99 | static int ziirave_wdt_revision(struct i2c_client *client, |
100 | struct ziirave_wdt_rev *rev, u8 command) |
101 | { |
102 | int ret; |
103 | |
104 | ret = i2c_smbus_read_byte_data(client, command); |
105 | if (ret < 0) |
106 | return ret; |
107 | |
108 | rev->major = ret; |
109 | |
110 | ret = i2c_smbus_read_byte_data(client, command: command + 1); |
111 | if (ret < 0) |
112 | return ret; |
113 | |
114 | rev->minor = ret; |
115 | |
116 | return 0; |
117 | } |
118 | |
119 | static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state) |
120 | { |
121 | struct i2c_client *client = to_i2c_client(wdd->parent); |
122 | |
123 | return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, value: state); |
124 | } |
125 | |
126 | static int ziirave_wdt_start(struct watchdog_device *wdd) |
127 | { |
128 | return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON); |
129 | } |
130 | |
131 | static int ziirave_wdt_stop(struct watchdog_device *wdd) |
132 | { |
133 | return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF); |
134 | } |
135 | |
136 | static int ziirave_wdt_ping(struct watchdog_device *wdd) |
137 | { |
138 | struct i2c_client *client = to_i2c_client(wdd->parent); |
139 | |
140 | return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING, |
141 | ZIIRAVE_PING_VALUE); |
142 | } |
143 | |
144 | static int ziirave_wdt_set_timeout(struct watchdog_device *wdd, |
145 | unsigned int timeout) |
146 | { |
147 | struct i2c_client *client = to_i2c_client(wdd->parent); |
148 | int ret; |
149 | |
150 | ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, value: timeout); |
151 | if (!ret) |
152 | wdd->timeout = timeout; |
153 | |
154 | return ret; |
155 | } |
156 | |
157 | static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd) |
158 | { |
159 | struct i2c_client *client = to_i2c_client(wdd->parent); |
160 | int ret; |
161 | |
162 | ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT); |
163 | if (ret < 0) |
164 | ret = 0; |
165 | |
166 | return ret; |
167 | } |
168 | |
169 | static int ziirave_firm_read_ack(struct watchdog_device *wdd) |
170 | { |
171 | struct i2c_client *client = to_i2c_client(wdd->parent); |
172 | int ret; |
173 | |
174 | ret = i2c_smbus_read_byte(client); |
175 | if (ret < 0) { |
176 | dev_err(&client->dev, "Failed to read status byte\n" ); |
177 | return ret; |
178 | } |
179 | |
180 | return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO; |
181 | } |
182 | |
183 | static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr) |
184 | { |
185 | struct i2c_client *client = to_i2c_client(wdd->parent); |
186 | const u16 addr16 = (u16)addr / 2; |
187 | u8 address[2]; |
188 | |
189 | put_unaligned_le16(val: addr16, p: address); |
190 | |
191 | return i2c_smbus_write_block_data(client, |
192 | ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR, |
193 | length: sizeof(address), values: address); |
194 | } |
195 | |
196 | static bool ziirave_firm_addr_readonly(u32 addr) |
197 | { |
198 | return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START || |
199 | addr > ZIIRAVE_FIRM_FLASH_MEMORY_END; |
200 | } |
201 | |
202 | /* |
203 | * ziirave_firm_write_pkt() - Build and write a firmware packet |
204 | * |
205 | * A packet to send to the firmware is composed by following bytes: |
206 | * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum | |
207 | * Where, |
208 | * Length: A data byte containing the length of the data. |
209 | * Addr0: Low byte of the address. |
210 | * Addr1: High byte of the address. |
211 | * Data0 .. Data15: Array of 16 bytes of data. |
212 | * Checksum: Checksum byte to verify data integrity. |
213 | */ |
214 | static int __ziirave_firm_write_pkt(struct watchdog_device *wdd, |
215 | u32 addr, const u8 *data, u8 len) |
216 | { |
217 | const u16 addr16 = (u16)addr / 2; |
218 | struct i2c_client *client = to_i2c_client(wdd->parent); |
219 | u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE]; |
220 | int ret; |
221 | |
222 | /* Check max data size */ |
223 | if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) { |
224 | dev_err(&client->dev, "Firmware packet too long (%d)\n" , |
225 | len); |
226 | return -EMSGSIZE; |
227 | } |
228 | |
229 | /* |
230 | * Ignore packets that are targeting program memory outisde of |
231 | * app partition, since they will be ignored by the |
232 | * bootloader. At the same time, we need to make sure we'll |
233 | * allow zero length packet that will be sent as the last step |
234 | * of firmware update |
235 | */ |
236 | if (len && ziirave_firm_addr_readonly(addr)) |
237 | return 0; |
238 | |
239 | /* Packet length */ |
240 | packet[0] = len; |
241 | /* Packet address */ |
242 | put_unaligned_le16(val: addr16, p: packet + 1); |
243 | |
244 | memcpy(packet + 3, data, len); |
245 | memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len); |
246 | |
247 | /* Packet checksum */ |
248 | for (i = 0; i < len + 3; i++) |
249 | checksum += packet[i]; |
250 | packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum; |
251 | |
252 | ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET, |
253 | length: sizeof(packet), values: packet); |
254 | if (ret) { |
255 | dev_err(&client->dev, |
256 | "Failed to send DOWNLOAD_PACKET: %d\n" , ret); |
257 | return ret; |
258 | } |
259 | |
260 | ret = ziirave_firm_read_ack(wdd); |
261 | if (ret) |
262 | dev_err(&client->dev, |
263 | "Failed to write firmware packet at address 0x%04x: %d\n" , |
264 | addr, ret); |
265 | |
266 | return ret; |
267 | } |
268 | |
269 | static int ziirave_firm_write_pkt(struct watchdog_device *wdd, |
270 | u32 addr, const u8 *data, u8 len) |
271 | { |
272 | const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE - |
273 | (addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE)); |
274 | int ret; |
275 | |
276 | if (len > max_write_len) { |
277 | /* |
278 | * If data crossed page boundary we need to split this |
279 | * write in two |
280 | */ |
281 | ret = __ziirave_firm_write_pkt(wdd, addr, data, len: max_write_len); |
282 | if (ret) |
283 | return ret; |
284 | |
285 | addr += max_write_len; |
286 | data += max_write_len; |
287 | len -= max_write_len; |
288 | } |
289 | |
290 | return __ziirave_firm_write_pkt(wdd, addr, data, len); |
291 | } |
292 | |
293 | static int ziirave_firm_verify(struct watchdog_device *wdd, |
294 | const struct firmware *fw) |
295 | { |
296 | struct i2c_client *client = to_i2c_client(wdd->parent); |
297 | const struct ihex_binrec *rec; |
298 | int i, ret; |
299 | u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE]; |
300 | |
301 | for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { |
302 | const u16 len = be16_to_cpu(rec->len); |
303 | const u32 addr = be32_to_cpu(rec->addr); |
304 | |
305 | if (ziirave_firm_addr_readonly(addr)) |
306 | continue; |
307 | |
308 | ret = ziirave_firm_set_read_addr(wdd, addr); |
309 | if (ret) { |
310 | dev_err(&client->dev, |
311 | "Failed to send SET_READ_ADDR command: %d\n" , |
312 | ret); |
313 | return ret; |
314 | } |
315 | |
316 | for (i = 0; i < len; i++) { |
317 | ret = i2c_smbus_read_byte_data(client, |
318 | ZIIRAVE_CMD_DOWNLOAD_READ_BYTE); |
319 | if (ret < 0) { |
320 | dev_err(&client->dev, |
321 | "Failed to READ DATA: %d\n" , ret); |
322 | return ret; |
323 | } |
324 | data[i] = ret; |
325 | } |
326 | |
327 | if (memcmp(p: data, q: rec->data, size: len)) { |
328 | dev_err(&client->dev, |
329 | "Firmware mismatch at address 0x%04x\n" , addr); |
330 | return -EINVAL; |
331 | } |
332 | } |
333 | |
334 | return 0; |
335 | } |
336 | |
337 | static int ziirave_firm_upload(struct watchdog_device *wdd, |
338 | const struct firmware *fw) |
339 | { |
340 | struct i2c_client *client = to_i2c_client(wdd->parent); |
341 | const struct ihex_binrec *rec; |
342 | int ret; |
343 | |
344 | ret = i2c_smbus_write_byte_data(client, |
345 | ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, |
346 | ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC); |
347 | if (ret) { |
348 | dev_err(&client->dev, "Failed to jump to bootloader\n" ); |
349 | return ret; |
350 | } |
351 | |
352 | msleep(msecs: 500); |
353 | |
354 | ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START); |
355 | if (ret) { |
356 | dev_err(&client->dev, "Failed to start download\n" ); |
357 | return ret; |
358 | } |
359 | |
360 | ret = ziirave_firm_read_ack(wdd); |
361 | if (ret) { |
362 | dev_err(&client->dev, "No ACK for start download\n" ); |
363 | return ret; |
364 | } |
365 | |
366 | msleep(msecs: 500); |
367 | |
368 | for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { |
369 | ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr), |
370 | data: rec->data, be16_to_cpu(rec->len)); |
371 | if (ret) |
372 | return ret; |
373 | } |
374 | |
375 | /* |
376 | * Finish firmware download process by sending a zero length |
377 | * payload |
378 | */ |
379 | ret = ziirave_firm_write_pkt(wdd, addr: 0, NULL, len: 0); |
380 | if (ret) { |
381 | dev_err(&client->dev, "Failed to send EMPTY packet: %d\n" , ret); |
382 | return ret; |
383 | } |
384 | |
385 | /* This sleep seems to be required */ |
386 | msleep(msecs: 20); |
387 | |
388 | /* Start firmware verification */ |
389 | ret = ziirave_firm_verify(wdd, fw); |
390 | if (ret) { |
391 | dev_err(&client->dev, |
392 | "Failed to verify firmware: %d\n" , ret); |
393 | return ret; |
394 | } |
395 | |
396 | /* End download operation */ |
397 | ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END); |
398 | if (ret) { |
399 | dev_err(&client->dev, |
400 | "Failed to end firmware download: %d\n" , ret); |
401 | return ret; |
402 | } |
403 | |
404 | /* Reset the processor */ |
405 | ret = i2c_smbus_write_byte_data(client, |
406 | ZIIRAVE_CMD_RESET_PROCESSOR, |
407 | ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC); |
408 | if (ret) { |
409 | dev_err(&client->dev, |
410 | "Failed to reset the watchdog: %d\n" , ret); |
411 | return ret; |
412 | } |
413 | |
414 | msleep(msecs: 500); |
415 | |
416 | return 0; |
417 | } |
418 | |
419 | static const struct watchdog_info ziirave_wdt_info = { |
420 | .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, |
421 | .identity = "RAVE Switch Watchdog" , |
422 | }; |
423 | |
424 | static const struct watchdog_ops ziirave_wdt_ops = { |
425 | .owner = THIS_MODULE, |
426 | .start = ziirave_wdt_start, |
427 | .stop = ziirave_wdt_stop, |
428 | .ping = ziirave_wdt_ping, |
429 | .set_timeout = ziirave_wdt_set_timeout, |
430 | .get_timeleft = ziirave_wdt_get_timeleft, |
431 | }; |
432 | |
433 | static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev, |
434 | struct device_attribute *attr, |
435 | char *buf) |
436 | { |
437 | struct i2c_client *client = to_i2c_client(dev->parent); |
438 | struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); |
439 | int ret; |
440 | |
441 | ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); |
442 | if (ret) |
443 | return ret; |
444 | |
445 | ret = sysfs_emit(buf, fmt: "02.%02u.%02u\n" , |
446 | w_priv->firmware_rev.major, |
447 | w_priv->firmware_rev.minor); |
448 | |
449 | mutex_unlock(lock: &w_priv->sysfs_mutex); |
450 | |
451 | return ret; |
452 | } |
453 | |
454 | static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm, |
455 | NULL); |
456 | |
457 | static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev, |
458 | struct device_attribute *attr, |
459 | char *buf) |
460 | { |
461 | struct i2c_client *client = to_i2c_client(dev->parent); |
462 | struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); |
463 | int ret; |
464 | |
465 | ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); |
466 | if (ret) |
467 | return ret; |
468 | |
469 | ret = sysfs_emit(buf, fmt: "01.%02u.%02u\n" , |
470 | w_priv->bootloader_rev.major, |
471 | w_priv->bootloader_rev.minor); |
472 | |
473 | mutex_unlock(lock: &w_priv->sysfs_mutex); |
474 | |
475 | return ret; |
476 | } |
477 | |
478 | static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot, |
479 | NULL); |
480 | |
481 | static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev, |
482 | struct device_attribute *attr, |
483 | char *buf) |
484 | { |
485 | struct i2c_client *client = to_i2c_client(dev->parent); |
486 | struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); |
487 | int ret; |
488 | |
489 | ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); |
490 | if (ret) |
491 | return ret; |
492 | |
493 | ret = sysfs_emit(buf, fmt: "%s\n" , ziirave_reasons[w_priv->reset_reason]); |
494 | |
495 | mutex_unlock(lock: &w_priv->sysfs_mutex); |
496 | |
497 | return ret; |
498 | } |
499 | |
500 | static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason, |
501 | NULL); |
502 | |
503 | static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev, |
504 | struct device_attribute *attr, |
505 | const char *buf, size_t count) |
506 | { |
507 | struct i2c_client *client = to_i2c_client(dev->parent); |
508 | struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); |
509 | const struct firmware *fw; |
510 | int err; |
511 | |
512 | err = request_ihex_firmware(fw: &fw, ZIIRAVE_FW_NAME, dev); |
513 | if (err) { |
514 | dev_err(&client->dev, "Failed to request ihex firmware\n" ); |
515 | return err; |
516 | } |
517 | |
518 | err = mutex_lock_interruptible(&w_priv->sysfs_mutex); |
519 | if (err) |
520 | goto release_firmware; |
521 | |
522 | err = ziirave_firm_upload(wdd: &w_priv->wdd, fw); |
523 | if (err) { |
524 | dev_err(&client->dev, "The firmware update failed: %d\n" , err); |
525 | goto unlock_mutex; |
526 | } |
527 | |
528 | /* Update firmware version */ |
529 | err = ziirave_wdt_revision(client, rev: &w_priv->firmware_rev, |
530 | ZIIRAVE_WDT_FIRM_VER_MAJOR); |
531 | if (err) { |
532 | dev_err(&client->dev, "Failed to read firmware version: %d\n" , |
533 | err); |
534 | goto unlock_mutex; |
535 | } |
536 | |
537 | dev_info(&client->dev, |
538 | "Firmware updated to version 02.%02u.%02u\n" , |
539 | w_priv->firmware_rev.major, w_priv->firmware_rev.minor); |
540 | |
541 | /* Restore the watchdog timeout */ |
542 | err = ziirave_wdt_set_timeout(wdd: &w_priv->wdd, timeout: w_priv->wdd.timeout); |
543 | if (err) |
544 | dev_err(&client->dev, "Failed to set timeout: %d\n" , err); |
545 | |
546 | unlock_mutex: |
547 | mutex_unlock(lock: &w_priv->sysfs_mutex); |
548 | |
549 | release_firmware: |
550 | release_firmware(fw); |
551 | |
552 | return err ? err : count; |
553 | } |
554 | |
555 | static DEVICE_ATTR(update_firmware, S_IWUSR, NULL, |
556 | ziirave_wdt_sysfs_store_firm); |
557 | |
558 | static struct attribute *ziirave_wdt_attrs[] = { |
559 | &dev_attr_firmware_version.attr, |
560 | &dev_attr_bootloader_version.attr, |
561 | &dev_attr_reset_reason.attr, |
562 | &dev_attr_update_firmware.attr, |
563 | NULL |
564 | }; |
565 | ATTRIBUTE_GROUPS(ziirave_wdt); |
566 | |
567 | static int ziirave_wdt_init_duration(struct i2c_client *client) |
568 | { |
569 | int ret; |
570 | |
571 | if (!reset_duration) { |
572 | /* See if the reset pulse duration is provided in an of_node */ |
573 | if (!client->dev.of_node) |
574 | ret = -ENODEV; |
575 | else |
576 | ret = of_property_read_u32(np: client->dev.of_node, |
577 | propname: "reset-duration-ms" , |
578 | out_value: &reset_duration); |
579 | if (ret) { |
580 | dev_info(&client->dev, |
581 | "No reset pulse duration specified, using default\n" ); |
582 | return 0; |
583 | } |
584 | } |
585 | |
586 | if (reset_duration < 1 || reset_duration > 255) |
587 | return -EINVAL; |
588 | |
589 | dev_info(&client->dev, "Setting reset duration to %dms" , |
590 | reset_duration); |
591 | |
592 | return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION, |
593 | value: reset_duration); |
594 | } |
595 | |
596 | static int ziirave_wdt_probe(struct i2c_client *client) |
597 | { |
598 | int ret; |
599 | struct ziirave_wdt_data *w_priv; |
600 | int val; |
601 | |
602 | if (!i2c_check_functionality(adap: client->adapter, |
603 | I2C_FUNC_SMBUS_BYTE | |
604 | I2C_FUNC_SMBUS_BYTE_DATA | |
605 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) |
606 | return -ENODEV; |
607 | |
608 | w_priv = devm_kzalloc(dev: &client->dev, size: sizeof(*w_priv), GFP_KERNEL); |
609 | if (!w_priv) |
610 | return -ENOMEM; |
611 | |
612 | mutex_init(&w_priv->sysfs_mutex); |
613 | |
614 | w_priv->wdd.info = &ziirave_wdt_info; |
615 | w_priv->wdd.ops = &ziirave_wdt_ops; |
616 | w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN; |
617 | w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX; |
618 | w_priv->wdd.parent = &client->dev; |
619 | w_priv->wdd.groups = ziirave_wdt_groups; |
620 | |
621 | watchdog_init_timeout(wdd: &w_priv->wdd, timeout_parm: wdt_timeout, dev: &client->dev); |
622 | |
623 | /* |
624 | * The default value set in the watchdog should be perfectly valid, so |
625 | * pass that in if we haven't provided one via the module parameter or |
626 | * of property. |
627 | */ |
628 | if (w_priv->wdd.timeout == 0) { |
629 | val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT); |
630 | if (val < 0) { |
631 | dev_err(&client->dev, "Failed to read timeout\n" ); |
632 | return val; |
633 | } |
634 | |
635 | if (val > ZIIRAVE_TIMEOUT_MAX || |
636 | val < ZIIRAVE_TIMEOUT_MIN) |
637 | val = ZIIRAVE_TIMEOUT_DEFAULT; |
638 | |
639 | w_priv->wdd.timeout = val; |
640 | } |
641 | |
642 | ret = ziirave_wdt_set_timeout(wdd: &w_priv->wdd, timeout: w_priv->wdd.timeout); |
643 | if (ret) { |
644 | dev_err(&client->dev, "Failed to set timeout\n" ); |
645 | return ret; |
646 | } |
647 | |
648 | dev_info(&client->dev, "Timeout set to %ds\n" , w_priv->wdd.timeout); |
649 | |
650 | watchdog_set_nowayout(wdd: &w_priv->wdd, nowayout); |
651 | |
652 | i2c_set_clientdata(client, data: w_priv); |
653 | |
654 | /* If in unconfigured state, set to stopped */ |
655 | val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE); |
656 | if (val < 0) { |
657 | dev_err(&client->dev, "Failed to read state\n" ); |
658 | return val; |
659 | } |
660 | |
661 | if (val == ZIIRAVE_STATE_INITIAL) |
662 | ziirave_wdt_stop(wdd: &w_priv->wdd); |
663 | |
664 | ret = ziirave_wdt_init_duration(client); |
665 | if (ret) { |
666 | dev_err(&client->dev, "Failed to init duration\n" ); |
667 | return ret; |
668 | } |
669 | |
670 | ret = ziirave_wdt_revision(client, rev: &w_priv->firmware_rev, |
671 | ZIIRAVE_WDT_FIRM_VER_MAJOR); |
672 | if (ret) { |
673 | dev_err(&client->dev, "Failed to read firmware version\n" ); |
674 | return ret; |
675 | } |
676 | |
677 | dev_info(&client->dev, |
678 | "Firmware version: 02.%02u.%02u\n" , |
679 | w_priv->firmware_rev.major, w_priv->firmware_rev.minor); |
680 | |
681 | ret = ziirave_wdt_revision(client, rev: &w_priv->bootloader_rev, |
682 | ZIIRAVE_WDT_BOOT_VER_MAJOR); |
683 | if (ret) { |
684 | dev_err(&client->dev, "Failed to read bootloader version\n" ); |
685 | return ret; |
686 | } |
687 | |
688 | dev_info(&client->dev, |
689 | "Bootloader version: 01.%02u.%02u\n" , |
690 | w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor); |
691 | |
692 | w_priv->reset_reason = i2c_smbus_read_byte_data(client, |
693 | ZIIRAVE_WDT_RESET_REASON); |
694 | if (w_priv->reset_reason < 0) { |
695 | dev_err(&client->dev, "Failed to read reset reason\n" ); |
696 | return w_priv->reset_reason; |
697 | } |
698 | |
699 | if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) || |
700 | !ziirave_reasons[w_priv->reset_reason]) { |
701 | dev_err(&client->dev, "Invalid reset reason\n" ); |
702 | return -ENODEV; |
703 | } |
704 | |
705 | ret = watchdog_register_device(&w_priv->wdd); |
706 | |
707 | return ret; |
708 | } |
709 | |
710 | static void ziirave_wdt_remove(struct i2c_client *client) |
711 | { |
712 | struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); |
713 | |
714 | watchdog_unregister_device(&w_priv->wdd); |
715 | } |
716 | |
717 | static const struct i2c_device_id ziirave_wdt_id[] = { |
718 | { "rave-wdt" , 0 }, |
719 | { } |
720 | }; |
721 | MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id); |
722 | |
723 | static const struct of_device_id zrv_wdt_of_match[] = { |
724 | { .compatible = "zii,rave-wdt" , }, |
725 | { }, |
726 | }; |
727 | MODULE_DEVICE_TABLE(of, zrv_wdt_of_match); |
728 | |
729 | static struct i2c_driver ziirave_wdt_driver = { |
730 | .driver = { |
731 | .name = "ziirave_wdt" , |
732 | .of_match_table = zrv_wdt_of_match, |
733 | }, |
734 | .probe = ziirave_wdt_probe, |
735 | .remove = ziirave_wdt_remove, |
736 | .id_table = ziirave_wdt_id, |
737 | }; |
738 | |
739 | module_i2c_driver(ziirave_wdt_driver); |
740 | |
741 | MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk" ); |
742 | MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver" ); |
743 | MODULE_LICENSE("GPL" ); |
744 | |