// SPDX-License-Identifier: GPL-2.0 /* Marvell GTI Watchdog driver * * Copyright (C) 2023 Marvell. */ #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/watchdog.h> /* * Hardware supports following mode of operation: * 1) Interrupt Only: * This will generate the interrupt to arm core whenever timeout happens. * * 2) Interrupt + del3t (Interrupt to firmware (SCP processor)). * This will generate interrupt to arm core on 1st timeout happens * This will generate interrupt to SCP processor on 2nd timeout happens * * 3) Interrupt + Interrupt to SCP processor (called delt3t) + reboot. * This will generate interrupt to arm core on 1st timeout happens * Will generate interrupt to SCP processor on 2nd timeout happens, * if interrupt is configured. * Reboot on 3rd timeout. * * Driver will use hardware in mode-3 above so that system can reboot in case * a hardware hang. Also h/w is configured not to generate SCP interrupt, so * effectively 2nd timeout is ignored within hardware. * * First timeout is effectively watchdog pretimeout. */ /* GTI CWD Watchdog (GTI_CWD_WDOG) Register */ #define GTI_CWD_WDOG(reg_offset) … #define GTI_CWD_WDOG_MODE_INT_DEL3T_RST … #define GTI_CWD_WDOG_MODE_MASK … #define GTI_CWD_WDOG_LEN_SHIFT … #define GTI_CWD_WDOG_LEN_MASK … #define GTI_CWD_WDOG_CNT_SHIFT … #define GTI_CWD_WDOG_CNT_MASK … /* GTI CWD Watchdog Interrupt (GTI_CWD_INT) Register */ #define GTI_CWD_INT … #define GTI_CWD_INT_PENDING_STATUS(bit) … /* GTI CWD Watchdog Interrupt Enable Clear (GTI_CWD_INT_ENA_CLR) Register */ #define GTI_CWD_INT_ENA_CLR … #define GTI_CWD_INT_ENA_CLR_VAL(bit) … /* GTI CWD Watchdog Interrupt Enable Set (GTI_CWD_INT_ENA_SET) Register */ #define GTI_CWD_INT_ENA_SET … #define GTI_CWD_INT_ENA_SET_VAL(bit) … /* GTI CWD Watchdog Poke (GTI_CWD_POKE) Registers */ #define GTI_CWD_POKE(reg_offset) … #define GTI_CWD_POKE_VAL … struct gti_match_data { … }; static const struct gti_match_data match_data_octeontx2 = …; static const struct gti_match_data match_data_cn10k = …; struct gti_wdt_priv { … }; static irqreturn_t gti_wdt_interrupt(int irq, void *data) { … } static int gti_wdt_ping(struct watchdog_device *wdev) { … } static int gti_wdt_start(struct watchdog_device *wdev) { … } static int gti_wdt_stop(struct watchdog_device *wdev) { … } static int gti_wdt_settimeout(struct watchdog_device *wdev, unsigned int timeout) { … } static int gti_wdt_set_pretimeout(struct watchdog_device *wdev, unsigned int timeout) { … } static void gti_clk_disable_unprepare(void *data) { … } static int gti_wdt_get_cntfrq(struct platform_device *pdev, struct gti_wdt_priv *priv) { … } static const struct watchdog_info gti_wdt_ident = …; static const struct watchdog_ops gti_wdt_ops = …; static int gti_wdt_probe(struct platform_device *pdev) { … } static const struct of_device_id gti_wdt_of_match[] = …; MODULE_DEVICE_TABLE(of, gti_wdt_of_match); static struct platform_driver gti_wdt_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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