/* * Ralink MT7621/MT7628 built-in hardware watchdog timer * * Copyright (C) 2014 John Crispin * * This driver was based on: drivers/watchdog/rt2880_wdt.c * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #define SYSC_RSTSTAT 0x38 #define WDT_RST_CAUSE BIT(1) #define RALINK_WDT_TIMEOUT 30 #define TIMER_REG_TMRSTAT 0x00 #define TIMER_REG_TMR1LOAD 0x24 #define TIMER_REG_TMR1CTL 0x20 #define TMR1CTL_ENABLE BIT(7) #define TMR1CTL_RESTART BIT(9) #define TMR1CTL_PRESCALE_SHIFT 16 static void __iomem *mt7621_wdt_base; static struct reset_control *mt7621_wdt_reset; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static inline void rt_wdt_w32(unsigned reg, u32 val) { iowrite32(val, mt7621_wdt_base + reg); } static inline u32 rt_wdt_r32(unsigned reg) { return ioread32(mt7621_wdt_base + reg); } static int mt7621_wdt_ping(struct watchdog_device *w) { rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART); return 0; } static int mt7621_wdt_set_timeout(struct watchdog_device *w, unsigned int t) { w->timeout = t; rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000); mt7621_wdt_ping(w); return 0; } static int mt7621_wdt_start(struct watchdog_device *w) { u32 t; /* set the prescaler to 1ms == 1000us */ rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << TMR1CTL_PRESCALE_SHIFT); mt7621_wdt_set_timeout(w, w->timeout); t = rt_wdt_r32(TIMER_REG_TMR1CTL); t |= TMR1CTL_ENABLE; rt_wdt_w32(TIMER_REG_TMR1CTL, t); return 0; } static int mt7621_wdt_stop(struct watchdog_device *w) { u32 t; mt7621_wdt_ping(w); t = rt_wdt_r32(TIMER_REG_TMR1CTL); t &= ~TMR1CTL_ENABLE; rt_wdt_w32(TIMER_REG_TMR1CTL, t); return 0; } static int mt7621_wdt_bootcause(void) { if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE) return WDIOF_CARDRESET; return 0; } static struct watchdog_info mt7621_wdt_info = { .identity = "Mediatek Watchdog", .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, }; static struct watchdog_ops mt7621_wdt_ops = { .owner = THIS_MODULE, .start = mt7621_wdt_start, .stop = mt7621_wdt_stop, .ping = mt7621_wdt_ping, .set_timeout = mt7621_wdt_set_timeout, }; static struct watchdog_device mt7621_wdt_dev = { .info = &mt7621_wdt_info, .ops = &mt7621_wdt_ops, .min_timeout = 1, .max_timeout = 0xfffful / 1000, }; static int mt7621_wdt_probe(struct platform_device *pdev) { struct resource *res; int ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mt7621_wdt_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mt7621_wdt_base)) return PTR_ERR(mt7621_wdt_base); mt7621_wdt_reset = devm_reset_control_get(&pdev->dev, NULL); if (!IS_ERR(mt7621_wdt_reset)) reset_control_deassert(mt7621_wdt_reset); mt7621_wdt_dev.bootstatus = mt7621_wdt_bootcause(); watchdog_init_timeout(&mt7621_wdt_dev, mt7621_wdt_dev.max_timeout, &pdev->dev); watchdog_set_nowayout(&mt7621_wdt_dev, nowayout); ret = watchdog_register_device(&mt7621_wdt_dev); return 0; } static int mt7621_wdt_remove(struct platform_device *pdev) { watchdog_unregister_device(&mt7621_wdt_dev); return 0; } static void mt7621_wdt_shutdown(struct platform_device *pdev) { mt7621_wdt_stop(&mt7621_wdt_dev); } static const struct of_device_id mt7621_wdt_match[] = { { .compatible = "mediatek,mt7621-wdt" }, {}, }; MODULE_DEVICE_TABLE(of, mt7621_wdt_match); static struct platform_driver mt7621_wdt_driver = { .probe = mt7621_wdt_probe, .remove = mt7621_wdt_remove, .shutdown = mt7621_wdt_shutdown, .driver = { .name = KBUILD_MODNAME, .of_match_table = mt7621_wdt_match, }, }; module_platform_driver(mt7621_wdt_driver); MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver"); MODULE_AUTHOR("John Crispin
authorLuuk Paulussen <luuk.paulussen@alliedtelesis.co.nz>2016-12-08 11:43:34 +1300
committerRalf Baechle <ralf@linux-mips.org>2016-12-11 11:19:04 +0100
commitedb6fa1a6452edf736c04d02e3f6de59043df69e (patch)
treef854dd896b1e5033a26f305ec9a50a87b1b13939 /tools/perf/arch/arm
parent3e5de27e940d00d8d504dfb96625fb654f641509 (diff)
MIPS: Return -ENODEV from weak implementation of rtc_mips_set_time
The sync_cmos_clock function in kernel/time/ntp.c first tries to update the internal clock of the cpu by calling the "update_persistent_clock64" architecture specific function. If this returns -ENODEV, it then tries to update an external RTC using "rtc_set_ntp_time". On the mips architecture, the weak implementation of the underlying function would return 0 if it wasn't overridden. This meant that the sync_cmos_clock function would never try to update an external RTC (if both CONFIG_GENERIC_CMOS_UPDATE and CONFIG_RTC_SYSTOHC are configured) Returning -ENODEV instead, means that an external RTC will be tried. Signed-off-by: Luuk Paulussen <luuk.paulussen@alliedtelesis.co.nz> Reviewed-by: Richard Laing <richard.laing@alliedtelesis.co.nz> Reviewed-by: Scott Parlane <scott.parlane@alliedtelesis.co.nz> Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14649/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'tools/perf/arch/arm')