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>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index a51ccf3..9ff8588 100644 (file)
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -494,6 +494,16 @@ config QCOM_WDT
          To compile this driver as a module, choose M here: the
          module will be called qcom_wdt.
 
+config MESON_WATCHDOG
+       tristate "Amlogic Meson SoCs watchdog support"
+       depends on ARCH_MESON
+       select WATCHDOG_CORE
+       help
+         Say Y here to include support for the watchdog timer
+         in Amlogic Meson SoCs.
+         To compile this driver as a module, choose M here: the
+         module will be called meson_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT

diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f8eaaf4..c569ec8 100644 (file)
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_SIRFSOC_WATCHDOG) += sirfsoc_wdt.o
 obj-$(CONFIG_QCOM_WDT) += qcom-wdt.o
 obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o
 obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o
+obj-$(CONFIG_MESON_WATCHDOG) += meson_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o

diff --git a/drivers/watchdog/meson_wdt.c b/drivers/watchdog/meson_wdt.c
new file mode 100644 (file)
index 0000000..37f9f5e
--- /dev/null
+++ b/drivers/watchdog/meson_wdt.c
@@ -0,0 +1,236 @@
+/*
+ *      Meson Watchdog Driver
+ *
+ *      Copyright (c) 2014 Carlo Caione
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define DRV_NAME               "meson_wdt"
+
+#define MESON_WDT_TC           0x00
+#define MESON_WDT_TC_EN                BIT(22)
+#define MESON_WDT_TC_TM_MASK   0x3fffff
+#define MESON_WDT_DC_RESET     (3 << 24)
+
+#define MESON_WDT_RESET                0x04
+
+#define MESON_WDT_TIMEOUT      30
+#define MESON_WDT_MIN_TIMEOUT  1
+#define MESON_WDT_MAX_TIMEOUT  (MESON_WDT_TC_TM_MASK / 100000)
+
+#define MESON_SEC_TO_TC(s)     ((s) * 100000)
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int timeout = MESON_WDT_TIMEOUT;
+
+struct meson_wdt_dev {
+       struct watchdog_device wdt_dev;
+       void __iomem *wdt_base;
+       struct notifier_block restart_handler;
+};
+
+static int meson_restart_handle(struct notifier_block *this, unsigned long mode,
+                               void *cmd)
+{
+       u32 tc_reboot = MESON_WDT_DC_RESET | MESON_WDT_TC_EN | 100;
+       struct meson_wdt_dev *meson_wdt = container_of(this,
+                                                      struct meson_wdt_dev,
+                                                      restart_handler);
+
+       while (1) {
+               writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC);
+               mdelay(5);
+       }
+
+       return NOTIFY_DONE;
+}
+
+static int meson_wdt_ping(struct watchdog_device *wdt_dev)
+{
+       struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
+
+       writel(0, meson_wdt->wdt_base + MESON_WDT_RESET);
+
+       return 0;
+}
+
+static void meson_wdt_change_timeout(struct watchdog_device *wdt_dev,
+                                    unsigned int timeout)
+{
+       struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
+       u32 reg;
+
+       reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
+       reg &= ~MESON_WDT_TC_TM_MASK;
+       reg |= MESON_SEC_TO_TC(timeout);
+       writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
+}
+
+static int meson_wdt_set_timeout(struct watchdog_device *wdt_dev,
+                                unsigned int timeout)
+{
+       wdt_dev->timeout = timeout;
+
+       meson_wdt_change_timeout(wdt_dev, timeout);
+       meson_wdt_ping(wdt_dev);
+
+       return 0;
+}
+
+static int meson_wdt_stop(struct watchdog_device *wdt_dev)
+{
+       struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
+       u32 reg;
+
+       reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
+       reg &= ~MESON_WDT_TC_EN;
+       writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
+
+       return 0;
+}
+
+static int meson_wdt_start(struct watchdog_device *wdt_dev)
+{
+       struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
+       u32 reg;
+
+       meson_wdt_change_timeout(wdt_dev, meson_wdt->wdt_dev.timeout);
+       meson_wdt_ping(wdt_dev);
+
+       reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
+       reg |= MESON_WDT_TC_EN;
+       writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
+
+       return 0;
+}
+
+static const struct watchdog_info meson_wdt_info = {
+       .identity       = DRV_NAME,
+       .options        = WDIOF_SETTIMEOUT |
+                         WDIOF_KEEPALIVEPING |
+                         WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops meson_wdt_ops = {
+       .owner          = THIS_MODULE,
+       .start          = meson_wdt_start,
+       .stop           = meson_wdt_stop,
+       .ping           = meson_wdt_ping,
+       .set_timeout    = meson_wdt_set_timeout,
+};
+
+static int meson_wdt_probe(struct platform_device *pdev)
+{
+       struct resource *res;
+       struct meson_wdt_dev *meson_wdt;
+       int err;
+
+       meson_wdt = devm_kzalloc(&pdev->dev, sizeof(*meson_wdt), GFP_KERNEL);
+       if (!meson_wdt)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       meson_wdt->wdt_base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(meson_wdt->wdt_base))
+               return PTR_ERR(meson_wdt->wdt_base);
+
+       meson_wdt->wdt_dev.parent = &pdev->dev;
+       meson_wdt->wdt_dev.info = &meson_wdt_info;
+       meson_wdt->wdt_dev.ops = &meson_wdt_ops;
+       meson_wdt->wdt_dev.timeout = MESON_WDT_TIMEOUT;
+       meson_wdt->wdt_dev.max_timeout = MESON_WDT_MAX_TIMEOUT;
+       meson_wdt->wdt_dev.min_timeout = MESON_WDT_MIN_TIMEOUT;
+
+       watchdog_set_drvdata(&meson_wdt->wdt_dev, meson_wdt);
+
+       watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, &pdev->dev);
+       watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout);
+
+       meson_wdt_stop(&meson_wdt->wdt_dev);
+
+       err = watchdog_register_device(&meson_wdt->wdt_dev);
+       if (err)
+               return err;
+
+       platform_set_drvdata(pdev, meson_wdt);
+
+       meson_wdt->restart_handler.notifier_call = meson_restart_handle;
+       meson_wdt->restart_handler.priority = 128;
+       err = register_restart_handler(&meson_wdt->restart_handler);
+       if (err)
+               dev_err(&pdev->dev,
+                       "cannot register restart handler (err=%d)\n", err);
+
+       dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
+                meson_wdt->wdt_dev.timeout, nowayout);
+
+       return 0;
+}
+
+static int meson_wdt_remove(struct platform_device *pdev)
+{
+       struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);
+
+       unregister_restart_handler(&meson_wdt->restart_handler);
+
+       watchdog_unregister_device(&meson_wdt->wdt_dev);
+
+       return 0;
+}
+
+static void meson_wdt_shutdown(struct platform_device *pdev)
+{
+       struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);
+
+       meson_wdt_stop(&meson_wdt->wdt_dev);
+}
+
+static const struct of_device_id meson_wdt_dt_ids[] = {
+       { .compatible = "amlogic,meson6-wdt" },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids);
+
+static struct platform_driver meson_wdt_driver = {
+       .probe          = meson_wdt_probe,
+       .remove         = meson_wdt_remove,
+       .shutdown       = meson_wdt_shutdown,
+       .driver         = {
+               .owner          = THIS_MODULE,
+               .name           = DRV_NAME,
+               .of_match_table = meson_wdt_dt_ids,
+       },
+};
+
+module_platform_driver(meson_wdt_driver);
+
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+                "Watchdog cannot be stopped once started (default="
+                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
+MODULE_DESCRIPTION("Meson Watchdog Timer Driver");