1 // SPDX-License-Identifier: GPL-2.0
3  * CZ.NIC's Turris Omnia MCU watchdog driver
16 #include <linux/turris-omnia-mcu-interface.h>
17 #include "turris-omnia-mcu.h"
32 	struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);  in omnia_wdt_start()  local
34 	return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 1);  in omnia_wdt_start()
39 	struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);  in omnia_wdt_stop()  local
41 	return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 0);  in omnia_wdt_stop()
46 	struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);  in omnia_wdt_ping()  local
48 	return omnia_cmd_write_u8(mcu->client, OMNIA_CMD_SET_WATCHDOG_STATE, 1);  in omnia_wdt_ping()
54 	struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);  in omnia_wdt_set_timeout()  local
56 	return omnia_cmd_write_u16(mcu->client, OMNIA_CMD_SET_WDT_TIMEOUT,  in omnia_wdt_set_timeout()
62 	struct omnia_mcu *mcu = watchdog_get_drvdata(wdt);  in omnia_wdt_get_timeleft()  local
66 	err = omnia_cmd_read_u16(mcu->client, OMNIA_CMD_GET_WDT_TIMELEFT,  in omnia_wdt_get_timeleft()
69 		dev_err(&mcu->client->dev, "Cannot get watchdog timeleft: %d\n",  in omnia_wdt_get_timeleft()
79 	.identity = "Turris Omnia MCU Watchdog",
91 int omnia_mcu_register_watchdog(struct omnia_mcu *mcu)  in omnia_mcu_register_watchdog()  argument
93 	struct device *dev = &mcu->client->dev;  in omnia_mcu_register_watchdog()
97 	if (!(mcu->features & OMNIA_FEAT_WDT_PING))  in omnia_mcu_register_watchdog()
100 	mcu->wdt.info = &omnia_wdt_info;  in omnia_mcu_register_watchdog()
101 	mcu->wdt.ops = &omnia_wdt_ops;  in omnia_mcu_register_watchdog()
102 	mcu->wdt.parent = dev;  in omnia_mcu_register_watchdog()
103 	mcu->wdt.min_timeout = 1;  in omnia_mcu_register_watchdog()
104 	mcu->wdt.max_timeout = 65535 / DECI;  in omnia_mcu_register_watchdog()
106 	mcu->wdt.timeout = WATCHDOG_TIMEOUT;  in omnia_mcu_register_watchdog()
107 	watchdog_init_timeout(&mcu->wdt, timeout, dev);  in omnia_mcu_register_watchdog()
109 	watchdog_set_drvdata(&mcu->wdt, mcu);  in omnia_mcu_register_watchdog()
111 	omnia_wdt_set_timeout(&mcu->wdt, mcu->wdt.timeout);  in omnia_mcu_register_watchdog()
113 	err = omnia_cmd_read_u8(mcu->client, OMNIA_CMD_GET_WATCHDOG_STATE,  in omnia_mcu_register_watchdog()
117 				     "Cannot get MCU watchdog state\n");  in omnia_mcu_register_watchdog()
120 		set_bit(WDOG_HW_RUNNING, &mcu->wdt.status);  in omnia_mcu_register_watchdog()
122 	watchdog_set_nowayout(&mcu->wdt, nowayout);  in omnia_mcu_register_watchdog()
123 	watchdog_stop_on_reboot(&mcu->wdt);  in omnia_mcu_register_watchdog()
124 	err = devm_watchdog_register_device(dev, &mcu->wdt);  in omnia_mcu_register_watchdog()
127 				     "Cannot register MCU watchdog\n");  in omnia_mcu_register_watchdog()