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0bade0215c
Commit a53e35db70 ("reset: Ensure drivers are explicit when requesting
reset lines") started to transition the reset control request API calls
to explicitly state whether the driver needs exclusive or shared reset
control behavior. Convert all drivers requesting exclusive resets to the
explicit API call so the temporary transition helpers can be removed.
No functional changes.
Cc: linux-watchdog@vger.kernel.org
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
185 lines
4.2 KiB
C
185 lines
4.2 KiB
C
/*
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* Ralink MT7621/MT7628 built-in hardware watchdog timer
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*
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* Copyright (C) 2014 John Crispin <john@phrozen.org>
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*
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* This driver was based on: drivers/watchdog/rt2880_wdt.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/reset.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/watchdog.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#define SYSC_RSTSTAT 0x38
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#define WDT_RST_CAUSE BIT(1)
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#define RALINK_WDT_TIMEOUT 30
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#define TIMER_REG_TMRSTAT 0x00
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#define TIMER_REG_TMR1LOAD 0x24
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#define TIMER_REG_TMR1CTL 0x20
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#define TMR1CTL_ENABLE BIT(7)
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#define TMR1CTL_RESTART BIT(9)
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#define TMR1CTL_PRESCALE_SHIFT 16
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static void __iomem *mt7621_wdt_base;
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static struct reset_control *mt7621_wdt_reset;
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static inline void rt_wdt_w32(unsigned reg, u32 val)
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{
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iowrite32(val, mt7621_wdt_base + reg);
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}
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static inline u32 rt_wdt_r32(unsigned reg)
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{
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return ioread32(mt7621_wdt_base + reg);
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}
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static int mt7621_wdt_ping(struct watchdog_device *w)
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{
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rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
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return 0;
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}
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static int mt7621_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
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{
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w->timeout = t;
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rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
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mt7621_wdt_ping(w);
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return 0;
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}
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static int mt7621_wdt_start(struct watchdog_device *w)
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{
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u32 t;
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/* set the prescaler to 1ms == 1000us */
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rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << TMR1CTL_PRESCALE_SHIFT);
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mt7621_wdt_set_timeout(w, w->timeout);
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t = rt_wdt_r32(TIMER_REG_TMR1CTL);
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t |= TMR1CTL_ENABLE;
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rt_wdt_w32(TIMER_REG_TMR1CTL, t);
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return 0;
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}
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static int mt7621_wdt_stop(struct watchdog_device *w)
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{
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u32 t;
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mt7621_wdt_ping(w);
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t = rt_wdt_r32(TIMER_REG_TMR1CTL);
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t &= ~TMR1CTL_ENABLE;
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rt_wdt_w32(TIMER_REG_TMR1CTL, t);
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return 0;
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}
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static int mt7621_wdt_bootcause(void)
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{
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if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
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return WDIOF_CARDRESET;
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return 0;
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}
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static struct watchdog_info mt7621_wdt_info = {
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.identity = "Mediatek Watchdog",
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops mt7621_wdt_ops = {
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.owner = THIS_MODULE,
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.start = mt7621_wdt_start,
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.stop = mt7621_wdt_stop,
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.ping = mt7621_wdt_ping,
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.set_timeout = mt7621_wdt_set_timeout,
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};
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static struct watchdog_device mt7621_wdt_dev = {
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.info = &mt7621_wdt_info,
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.ops = &mt7621_wdt_ops,
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.min_timeout = 1,
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.max_timeout = 0xfffful / 1000,
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};
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static int mt7621_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mt7621_wdt_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(mt7621_wdt_base))
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return PTR_ERR(mt7621_wdt_base);
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mt7621_wdt_reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
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if (!IS_ERR(mt7621_wdt_reset))
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reset_control_deassert(mt7621_wdt_reset);
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mt7621_wdt_dev.bootstatus = mt7621_wdt_bootcause();
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watchdog_init_timeout(&mt7621_wdt_dev, mt7621_wdt_dev.max_timeout,
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&pdev->dev);
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watchdog_set_nowayout(&mt7621_wdt_dev, nowayout);
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ret = watchdog_register_device(&mt7621_wdt_dev);
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return 0;
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}
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static int mt7621_wdt_remove(struct platform_device *pdev)
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{
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watchdog_unregister_device(&mt7621_wdt_dev);
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return 0;
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}
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static void mt7621_wdt_shutdown(struct platform_device *pdev)
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{
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mt7621_wdt_stop(&mt7621_wdt_dev);
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}
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static const struct of_device_id mt7621_wdt_match[] = {
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{ .compatible = "mediatek,mt7621-wdt" },
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{},
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};
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MODULE_DEVICE_TABLE(of, mt7621_wdt_match);
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static struct platform_driver mt7621_wdt_driver = {
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.probe = mt7621_wdt_probe,
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.remove = mt7621_wdt_remove,
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.shutdown = mt7621_wdt_shutdown,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = mt7621_wdt_match,
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},
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};
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module_platform_driver(mt7621_wdt_driver);
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MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
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MODULE_AUTHOR("John Crispin <john@phrozen.org");
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MODULE_LICENSE("GPL v2");
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