1 // SPDX-License-Identifier: GPL-2.0-or-later
15 #include <linux/firmware.h>
61 /* Firmware commands */
96 		 "Watchdog reset pulse duration in milliseconds");
112 	rev->major = ret;  in ziirave_wdt_revision()
118 	rev->minor = ret;  in ziirave_wdt_revision()
125 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_wdt_set_state()
142 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_wdt_ping()
151 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_wdt_set_timeout()
156 		wdd->timeout = timeout;  in ziirave_wdt_set_timeout()
163 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_wdt_get_timeleft()
175 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_firm_read_ack()
180 		dev_err(&client->dev, "Failed to read status byte\n");  in ziirave_firm_read_ack()
184 	return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;  in ziirave_firm_read_ack()
189 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_firm_set_read_addr()
207  * ziirave_firm_write_pkt() - Build and write a firmware packet
209  * A packet to send to the firmware is composed by following bytes:
222 	struct i2c_client *client = to_i2c_client(wdd->parent);  in __ziirave_firm_write_pkt()
228 		dev_err(&client->dev, "Firmware packet too long (%d)\n",  in __ziirave_firm_write_pkt()
230 		return -EMSGSIZE;  in __ziirave_firm_write_pkt()
238 	 * of firmware update  in __ziirave_firm_write_pkt()
249 	memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len);  in __ziirave_firm_write_pkt()
254 	packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;  in __ziirave_firm_write_pkt()
259 		dev_err(&client->dev,  in __ziirave_firm_write_pkt()
266 		dev_err(&client->dev,  in __ziirave_firm_write_pkt()
267 		      "Failed to write firmware packet at address 0x%04x: %d\n",  in __ziirave_firm_write_pkt()
276 	const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE -  in ziirave_firm_write_pkt()
277 		(addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE));  in ziirave_firm_write_pkt()
291 		len  -= max_write_len;  in ziirave_firm_write_pkt()
298 			       const struct firmware *fw)  in ziirave_firm_verify()
300 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_firm_verify()
305 	for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {  in ziirave_firm_verify()
306 		const u16 len = be16_to_cpu(rec->len);  in ziirave_firm_verify()
307 		const u32 addr = be32_to_cpu(rec->addr);  in ziirave_firm_verify()
314 			dev_err(&client->dev,  in ziirave_firm_verify()
324 				dev_err(&client->dev,  in ziirave_firm_verify()
331 		if (memcmp(data, rec->data, len)) {  in ziirave_firm_verify()
332 			dev_err(&client->dev,  in ziirave_firm_verify()
333 				"Firmware mismatch at address 0x%04x\n", addr);  in ziirave_firm_verify()
334 			return -EINVAL;  in ziirave_firm_verify()
342 			       const struct firmware *fw)  in ziirave_firm_upload()
344 	struct i2c_client *client = to_i2c_client(wdd->parent);  in ziirave_firm_upload()
352 		dev_err(&client->dev, "Failed to jump to bootloader\n");  in ziirave_firm_upload()
360 		dev_err(&client->dev, "Failed to start download\n");  in ziirave_firm_upload()
366 		dev_err(&client->dev, "No ACK for start download\n");  in ziirave_firm_upload()
372 	for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {  in ziirave_firm_upload()
373 		ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr),  in ziirave_firm_upload()
374 					     rec->data, be16_to_cpu(rec->len));  in ziirave_firm_upload()
380 	 * Finish firmware download process by sending a zero length  in ziirave_firm_upload()
385 		dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret);  in ziirave_firm_upload()
392 	/* Start firmware verification */  in ziirave_firm_upload()
395 		dev_err(&client->dev,  in ziirave_firm_upload()
396 			"Failed to verify firmware: %d\n", ret);  in ziirave_firm_upload()
403 		dev_err(&client->dev,  in ziirave_firm_upload()
404 			"Failed to end firmware download: %d\n", ret);  in ziirave_firm_upload()
408 	/* Reset the processor */  in ziirave_firm_upload()
413 		dev_err(&client->dev,  in ziirave_firm_upload()
414 			"Failed to reset the watchdog: %d\n", ret);  in ziirave_firm_upload()
441 	struct i2c_client *client = to_i2c_client(dev->parent);  in ziirave_wdt_sysfs_show_firm()
445 	ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_firm()
449 	ret = sprintf(buf, ZIIRAVE_FW_VERSION_FMT, w_priv->firmware_rev.major,  in ziirave_wdt_sysfs_show_firm()
450 		      w_priv->firmware_rev.minor);  in ziirave_wdt_sysfs_show_firm()
452 	mutex_unlock(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_firm()
464 	struct i2c_client *client = to_i2c_client(dev->parent);  in ziirave_wdt_sysfs_show_boot()
468 	ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_boot()
472 	ret = sprintf(buf, ZIIRAVE_BL_VERSION_FMT, w_priv->bootloader_rev.major,  in ziirave_wdt_sysfs_show_boot()
473 		      w_priv->bootloader_rev.minor);  in ziirave_wdt_sysfs_show_boot()
475 	mutex_unlock(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_boot()
487 	struct i2c_client *client = to_i2c_client(dev->parent);  in ziirave_wdt_sysfs_show_reason()
491 	ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_reason()
495 	ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);  in ziirave_wdt_sysfs_show_reason()
497 	mutex_unlock(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_show_reason()
509 	struct i2c_client *client = to_i2c_client(dev->parent);  in ziirave_wdt_sysfs_store_firm()
511 	const struct firmware *fw;  in ziirave_wdt_sysfs_store_firm()
516 		dev_err(&client->dev, "Failed to request ihex firmware\n");  in ziirave_wdt_sysfs_store_firm()
520 	err = mutex_lock_interruptible(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_store_firm()
524 	err = ziirave_firm_upload(&w_priv->wdd, fw);  in ziirave_wdt_sysfs_store_firm()
526 		dev_err(&client->dev, "The firmware update failed: %d\n", err);  in ziirave_wdt_sysfs_store_firm()
530 	/* Update firmware version */  in ziirave_wdt_sysfs_store_firm()
531 	err = ziirave_wdt_revision(client, &w_priv->firmware_rev,  in ziirave_wdt_sysfs_store_firm()
534 		dev_err(&client->dev, "Failed to read firmware version: %d\n",  in ziirave_wdt_sysfs_store_firm()
539 	dev_info(&client->dev,  in ziirave_wdt_sysfs_store_firm()
540 		 "Firmware updated to version " ZIIRAVE_FW_VERSION_FMT "\n",  in ziirave_wdt_sysfs_store_firm()
541 		 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);  in ziirave_wdt_sysfs_store_firm()
544 	err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);  in ziirave_wdt_sysfs_store_firm()
546 		dev_err(&client->dev, "Failed to set timeout: %d\n", err);  in ziirave_wdt_sysfs_store_firm()
549 	mutex_unlock(&w_priv->sysfs_mutex);  in ziirave_wdt_sysfs_store_firm()
574 		/* See if the reset pulse duration is provided in an of_node */  in ziirave_wdt_init_duration()
575 		if (!client->dev.of_node)  in ziirave_wdt_init_duration()
576 			ret = -ENODEV;  in ziirave_wdt_init_duration()
578 			ret = of_property_read_u32(client->dev.of_node,  in ziirave_wdt_init_duration()
579 						   "reset-duration-ms",  in ziirave_wdt_init_duration()
582 			dev_info(&client->dev,  in ziirave_wdt_init_duration()
583 			 "No reset pulse duration specified, using default\n");  in ziirave_wdt_init_duration()
589 		return -EINVAL;  in ziirave_wdt_init_duration()
591 	dev_info(&client->dev, "Setting reset duration to %dms",  in ziirave_wdt_init_duration()
605 	if (!i2c_check_functionality(client->adapter,  in ziirave_wdt_probe()
609 		return -ENODEV;  in ziirave_wdt_probe()
611 	w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);  in ziirave_wdt_probe()
613 		return -ENOMEM;  in ziirave_wdt_probe()
615 	mutex_init(&w_priv->sysfs_mutex);  in ziirave_wdt_probe()
617 	w_priv->wdd.info = &ziirave_wdt_info;  in ziirave_wdt_probe()
618 	w_priv->wdd.ops = &ziirave_wdt_ops;  in ziirave_wdt_probe()
619 	w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;  in ziirave_wdt_probe()
620 	w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX;  in ziirave_wdt_probe()
621 	w_priv->wdd.parent = &client->dev;  in ziirave_wdt_probe()
622 	w_priv->wdd.groups = ziirave_wdt_groups;  in ziirave_wdt_probe()
624 	watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev);  in ziirave_wdt_probe()
631 	if (w_priv->wdd.timeout == 0) {  in ziirave_wdt_probe()
634 			dev_err(&client->dev, "Failed to read timeout\n");  in ziirave_wdt_probe()
642 		w_priv->wdd.timeout = val;  in ziirave_wdt_probe()
645 	ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);  in ziirave_wdt_probe()
647 		dev_err(&client->dev, "Failed to set timeout\n");  in ziirave_wdt_probe()
651 	dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout);  in ziirave_wdt_probe()
653 	watchdog_set_nowayout(&w_priv->wdd, nowayout);  in ziirave_wdt_probe()
660 		dev_err(&client->dev, "Failed to read state\n");  in ziirave_wdt_probe()
665 		ziirave_wdt_stop(&w_priv->wdd);  in ziirave_wdt_probe()
669 		dev_err(&client->dev, "Failed to init duration\n");  in ziirave_wdt_probe()
673 	ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,  in ziirave_wdt_probe()
676 		dev_err(&client->dev, "Failed to read firmware version\n");  in ziirave_wdt_probe()
680 	dev_info(&client->dev,  in ziirave_wdt_probe()
681 		 "Firmware version: " ZIIRAVE_FW_VERSION_FMT "\n",  in ziirave_wdt_probe()
682 		 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);  in ziirave_wdt_probe()
684 	ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,  in ziirave_wdt_probe()
687 		dev_err(&client->dev, "Failed to read bootloader version\n");  in ziirave_wdt_probe()
691 	dev_info(&client->dev,  in ziirave_wdt_probe()
693 		 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor);  in ziirave_wdt_probe()
695 	w_priv->reset_reason = i2c_smbus_read_byte_data(client,  in ziirave_wdt_probe()
697 	if (w_priv->reset_reason < 0) {  in ziirave_wdt_probe()
698 		dev_err(&client->dev, "Failed to read reset reason\n");  in ziirave_wdt_probe()
699 		return w_priv->reset_reason;  in ziirave_wdt_probe()
702 	if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||  in ziirave_wdt_probe()
703 	    !ziirave_reasons[w_priv->reset_reason]) {  in ziirave_wdt_probe()
704 		dev_err(&client->dev, "Invalid reset reason\n");  in ziirave_wdt_probe()
705 		return -ENODEV;  in ziirave_wdt_probe()
708 	ret = watchdog_register_device(&w_priv->wdd);  in ziirave_wdt_probe()
717 	watchdog_unregister_device(&w_priv->wdd);  in ziirave_wdt_remove()
723 	{ "rave-wdt", 0 },
729 	{ .compatible = "zii,rave-wdt", },