ARM: meson: add watchdog driver
This patch adds the watchdog driver for the Amlogic Meson SoCs used also to reboot the device. Signed-off-by: Carlo Caione <carlo@caione.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Carlo Caione
Wim Van Sebroeck
Родитель
0c5691f008
Коммит
22e1b8f60f
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@ -494,6 +494,16 @@ config QCOM_WDT
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To compile this driver as a module, choose M here: the
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module will be called qcom_wdt.
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config MESON_WATCHDOG
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tristate "Amlogic Meson SoCs watchdog support"
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depends on ARCH_MESON
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select WATCHDOG_CORE
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help
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Say Y here to include support for the watchdog timer
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in Amlogic Meson SoCs.
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To compile this driver as a module, choose M here: the
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module will be called meson_wdt.
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# AVR32 Architecture
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config AT32AP700X_WDT
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@ -62,6 +62,7 @@ obj-$(CONFIG_SIRFSOC_WATCHDOG) += sirfsoc_wdt.o
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obj-$(CONFIG_QCOM_WDT) += qcom-wdt.o
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obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o
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obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o
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obj-$(CONFIG_MESON_WATCHDOG) += meson_wdt.o
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# AVR32 Architecture
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obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
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@ -0,0 +1,236 @@
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/*
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* Meson Watchdog Driver
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*
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* Copyright (c) 2014 Carlo Caione
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#define DRV_NAME "meson_wdt"
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#define MESON_WDT_TC 0x00
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#define MESON_WDT_TC_EN BIT(22)
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#define MESON_WDT_TC_TM_MASK 0x3fffff
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#define MESON_WDT_DC_RESET (3 << 24)
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#define MESON_WDT_RESET 0x04
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#define MESON_WDT_TIMEOUT 30
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#define MESON_WDT_MIN_TIMEOUT 1
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#define MESON_WDT_MAX_TIMEOUT (MESON_WDT_TC_TM_MASK / 100000)
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#define MESON_SEC_TO_TC(s) ((s) * 100000)
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static unsigned int timeout = MESON_WDT_TIMEOUT;
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struct meson_wdt_dev {
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struct watchdog_device wdt_dev;
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void __iomem *wdt_base;
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struct notifier_block restart_handler;
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};
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static int meson_restart_handle(struct notifier_block *this, unsigned long mode,
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void *cmd)
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{
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u32 tc_reboot = MESON_WDT_DC_RESET | MESON_WDT_TC_EN | 100;
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struct meson_wdt_dev *meson_wdt = container_of(this,
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struct meson_wdt_dev,
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restart_handler);
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while (1) {
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writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC);
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mdelay(5);
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}
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return NOTIFY_DONE;
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}
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static int meson_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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writel(0, meson_wdt->wdt_base + MESON_WDT_RESET);
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return 0;
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}
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static void meson_wdt_change_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg &= ~MESON_WDT_TC_TM_MASK;
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reg |= MESON_SEC_TO_TC(timeout);
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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}
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static int meson_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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wdt_dev->timeout = timeout;
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meson_wdt_change_timeout(wdt_dev, timeout);
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meson_wdt_ping(wdt_dev);
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return 0;
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}
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static int meson_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg &= ~MESON_WDT_TC_EN;
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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return 0;
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}
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static int meson_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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meson_wdt_change_timeout(wdt_dev, meson_wdt->wdt_dev.timeout);
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meson_wdt_ping(wdt_dev);
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg |= MESON_WDT_TC_EN;
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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return 0;
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}
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static const struct watchdog_info meson_wdt_info = {
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.identity = DRV_NAME,
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops meson_wdt_ops = {
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.owner = THIS_MODULE,
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.start = meson_wdt_start,
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.stop = meson_wdt_stop,
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.ping = meson_wdt_ping,
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.set_timeout = meson_wdt_set_timeout,
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};
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static int meson_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct meson_wdt_dev *meson_wdt;
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int err;
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meson_wdt = devm_kzalloc(&pdev->dev, sizeof(*meson_wdt), GFP_KERNEL);
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if (!meson_wdt)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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meson_wdt->wdt_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(meson_wdt->wdt_base))
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return PTR_ERR(meson_wdt->wdt_base);
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meson_wdt->wdt_dev.parent = &pdev->dev;
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meson_wdt->wdt_dev.info = &meson_wdt_info;
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meson_wdt->wdt_dev.ops = &meson_wdt_ops;
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meson_wdt->wdt_dev.timeout = MESON_WDT_TIMEOUT;
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meson_wdt->wdt_dev.max_timeout = MESON_WDT_MAX_TIMEOUT;
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meson_wdt->wdt_dev.min_timeout = MESON_WDT_MIN_TIMEOUT;
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watchdog_set_drvdata(&meson_wdt->wdt_dev, meson_wdt);
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watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, &pdev->dev);
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watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout);
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meson_wdt_stop(&meson_wdt->wdt_dev);
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err = watchdog_register_device(&meson_wdt->wdt_dev);
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if (err)
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return err;
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platform_set_drvdata(pdev, meson_wdt);
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meson_wdt->restart_handler.notifier_call = meson_restart_handle;
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meson_wdt->restart_handler.priority = 128;
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err = register_restart_handler(&meson_wdt->restart_handler);
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if (err)
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dev_err(&pdev->dev,
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"cannot register restart handler (err=%d)\n", err);
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dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
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meson_wdt->wdt_dev.timeout, nowayout);
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return 0;
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}
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static int meson_wdt_remove(struct platform_device *pdev)
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{
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struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);
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unregister_restart_handler(&meson_wdt->restart_handler);
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watchdog_unregister_device(&meson_wdt->wdt_dev);
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return 0;
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}
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static void meson_wdt_shutdown(struct platform_device *pdev)
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{
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struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);
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meson_wdt_stop(&meson_wdt->wdt_dev);
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}
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static const struct of_device_id meson_wdt_dt_ids[] = {
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{ .compatible = "amlogic,meson6-wdt" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids);
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static struct platform_driver meson_wdt_driver = {
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.probe = meson_wdt_probe,
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.remove = meson_wdt_remove,
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.shutdown = meson_wdt_shutdown,
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.driver = {
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.owner = THIS_MODULE,
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.name = DRV_NAME,
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.of_match_table = meson_wdt_dt_ids,
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},
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};
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module_platform_driver(meson_wdt_driver);
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");
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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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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
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MODULE_DESCRIPTION("Meson Watchdog Timer Driver");
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