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b18f22d02a
Fix the following warning (Building: ci20_defconfig mips):
drivers/watchdog/jz4740_wdt.c: In function ‘jz4740_wdt_probe’:
drivers/watchdog/jz4740_wdt.c:165:6: warning: unused variable ‘ret’ [-Wunused-variable]
int ret;
^~~
Fixes: 9ee644c932
("watchdog: jz4740_wdt: drop warning after registering device")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190806073953.GA13685@embeddedor
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
211 lines
5.7 KiB
C
211 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net>
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* JZ4740 Watchdog driver
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*/
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#include <linux/mfd/ingenic-tcu.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <asm/mach-jz4740/timer.h>
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#define JZ_WDT_CLOCK_PCLK 0x1
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#define JZ_WDT_CLOCK_RTC 0x2
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#define JZ_WDT_CLOCK_EXT 0x4
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#define JZ_WDT_CLOCK_DIV_1 (0 << TCU_TCSR_PRESCALE_LSB)
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#define JZ_WDT_CLOCK_DIV_4 (1 << TCU_TCSR_PRESCALE_LSB)
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#define JZ_WDT_CLOCK_DIV_16 (2 << TCU_TCSR_PRESCALE_LSB)
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#define JZ_WDT_CLOCK_DIV_64 (3 << TCU_TCSR_PRESCALE_LSB)
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#define JZ_WDT_CLOCK_DIV_256 (4 << TCU_TCSR_PRESCALE_LSB)
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#define JZ_WDT_CLOCK_DIV_1024 (5 << TCU_TCSR_PRESCALE_LSB)
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#define DEFAULT_HEARTBEAT 5
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#define MAX_HEARTBEAT 2048
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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 unsigned int heartbeat = DEFAULT_HEARTBEAT;
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module_param(heartbeat, uint, 0);
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MODULE_PARM_DESC(heartbeat,
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"Watchdog heartbeat period in seconds from 1 to "
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__MODULE_STRING(MAX_HEARTBEAT) ", default "
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__MODULE_STRING(DEFAULT_HEARTBEAT));
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struct jz4740_wdt_drvdata {
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struct watchdog_device wdt;
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void __iomem *base;
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struct clk *rtc_clk;
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};
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static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
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writew(0x0, drvdata->base + TCU_REG_WDT_TCNT);
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return 0;
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}
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static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int new_timeout)
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{
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struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
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unsigned int rtc_clk_rate;
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unsigned int timeout_value;
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unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
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u8 tcer;
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rtc_clk_rate = clk_get_rate(drvdata->rtc_clk);
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timeout_value = rtc_clk_rate * new_timeout;
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while (timeout_value > 0xffff) {
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if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
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/* Requested timeout too high;
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* use highest possible value. */
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timeout_value = 0xffff;
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break;
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}
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timeout_value >>= 2;
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clock_div += (1 << TCU_TCSR_PRESCALE_LSB);
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}
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tcer = readb(drvdata->base + TCU_REG_WDT_TCER);
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writeb(0x0, drvdata->base + TCU_REG_WDT_TCER);
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writew(clock_div, drvdata->base + TCU_REG_WDT_TCSR);
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writew((u16)timeout_value, drvdata->base + TCU_REG_WDT_TDR);
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writew(0x0, drvdata->base + TCU_REG_WDT_TCNT);
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writew(clock_div | JZ_WDT_CLOCK_RTC, drvdata->base + TCU_REG_WDT_TCSR);
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if (tcer & TCU_WDT_TCER_TCEN)
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writeb(TCU_WDT_TCER_TCEN, drvdata->base + TCU_REG_WDT_TCER);
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wdt_dev->timeout = new_timeout;
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return 0;
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}
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static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
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u8 tcer;
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tcer = readb(drvdata->base + TCU_REG_WDT_TCER);
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jz4740_timer_enable_watchdog();
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jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
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/* Start watchdog if it wasn't started already */
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if (!(tcer & TCU_WDT_TCER_TCEN))
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writeb(TCU_WDT_TCER_TCEN, drvdata->base + TCU_REG_WDT_TCER);
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return 0;
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}
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static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
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writeb(0x0, drvdata->base + TCU_REG_WDT_TCER);
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jz4740_timer_disable_watchdog();
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return 0;
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}
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static int jz4740_wdt_restart(struct watchdog_device *wdt_dev,
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unsigned long action, void *data)
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{
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wdt_dev->timeout = 0;
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jz4740_wdt_start(wdt_dev);
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return 0;
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}
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static const struct watchdog_info jz4740_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "jz4740 Watchdog",
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};
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static const struct watchdog_ops jz4740_wdt_ops = {
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.owner = THIS_MODULE,
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.start = jz4740_wdt_start,
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.stop = jz4740_wdt_stop,
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.ping = jz4740_wdt_ping,
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.set_timeout = jz4740_wdt_set_timeout,
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.restart = jz4740_wdt_restart,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id jz4740_wdt_of_matches[] = {
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{ .compatible = "ingenic,jz4740-watchdog", },
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{ .compatible = "ingenic,jz4780-watchdog", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
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#endif
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static int jz4740_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct jz4740_wdt_drvdata *drvdata;
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struct watchdog_device *jz4740_wdt;
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drvdata = devm_kzalloc(dev, sizeof(struct jz4740_wdt_drvdata),
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GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
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heartbeat = DEFAULT_HEARTBEAT;
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jz4740_wdt = &drvdata->wdt;
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jz4740_wdt->info = &jz4740_wdt_info;
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jz4740_wdt->ops = &jz4740_wdt_ops;
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jz4740_wdt->timeout = heartbeat;
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jz4740_wdt->min_timeout = 1;
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jz4740_wdt->max_timeout = MAX_HEARTBEAT;
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jz4740_wdt->parent = dev;
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watchdog_set_nowayout(jz4740_wdt, nowayout);
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watchdog_set_drvdata(jz4740_wdt, drvdata);
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drvdata->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(drvdata->base))
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return PTR_ERR(drvdata->base);
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drvdata->rtc_clk = devm_clk_get(dev, "rtc");
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if (IS_ERR(drvdata->rtc_clk)) {
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dev_err(dev, "cannot find RTC clock\n");
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return PTR_ERR(drvdata->rtc_clk);
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}
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return devm_watchdog_register_device(dev, &drvdata->wdt);
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}
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static struct platform_driver jz4740_wdt_driver = {
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.probe = jz4740_wdt_probe,
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.driver = {
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.name = "jz4740-wdt",
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.of_match_table = of_match_ptr(jz4740_wdt_of_matches),
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},
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};
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module_platform_driver(jz4740_wdt_driver);
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MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
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MODULE_DESCRIPTION("jz4740 Watchdog Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:jz4740-wdt");
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