![Guenter Roeck](/assets/img/avatar_default.png)
Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches Cc: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
193 lines
4.7 KiB
C
193 lines
4.7 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 <linux/mod_devicetable.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 int mt7621_wdt_is_running(struct watchdog_device *w)
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{
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return !!(rt_wdt_r32(TIMER_REG_TMR1CTL) & TMR1CTL_ENABLE);
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}
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static const 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 device *dev = &pdev->dev;
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mt7621_wdt_base = devm_platform_ioremap_resource(pdev, 0);
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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(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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dev);
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watchdog_set_nowayout(&mt7621_wdt_dev, nowayout);
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if (mt7621_wdt_is_running(&mt7621_wdt_dev)) {
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/*
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* Make sure to apply timeout from watchdog core, taking
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* the prescaler of this driver here into account (the
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* boot loader might be using a different prescaler).
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*
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* To avoid spurious resets because of different scaling,
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* we first disable the watchdog, set the new prescaler
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* and timeout, and then re-enable the watchdog.
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*/
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mt7621_wdt_stop(&mt7621_wdt_dev);
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mt7621_wdt_start(&mt7621_wdt_dev);
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set_bit(WDOG_HW_RUNNING, &mt7621_wdt_dev.status);
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}
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return devm_watchdog_register_device(dev, &mt7621_wdt_dev);
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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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.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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