watchdog: Add Broadcom BCM2835 watchdog timer driver

This adds a driver for watchdog timer hardware present on Broadcom BCM2835 SoC,
used in Raspberry Pi and Roku 2 devices.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: linux-rpi-kernel@lists.infradead.org
Cc: linux-watchdog@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org

3 files changed, 201 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 6042e9ed542c..f17ffdb75bb0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1100,6 +1100,17 @@ config BCM63XX_WDT
           To compile this driver as a loadable module, choose M here.
           The module will be called bcm63xx_wdt.
 
+config BCM2835_WDT
+        tristate "Broadcom BCM2835 hardware watchdog"
+        depends on ARCH_BCM2835
+        select WATCHDOG_CORE
+        help
+          Watchdog driver for the built in watchdog hardware in Broadcom
+          BCM2835 SoC.
+
+          To compile this driver as a loadable module, choose M here.
+          The module will be called bcm2835_wdt.
+
 config LANTIQ_WDT
         tristate "Lantiq SoC watchdog"
         depends on LANTIQ
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 291828b356c5..c443f6247fa6 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
 obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
 obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
 obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
+obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c
new file mode 100644
index 000000000000..61566fc47f84
--- /dev/null
+++ b/drivers/watchdog/bcm2835_wdt.c
@@ -0,0 +1,189 @@
+/*
+ * Watchdog driver for Broadcom BCM2835
+ *
+ * "bcm2708_wdog" driver written by Luke Diamand that was obtained from
+ * branch "rpi-3.6.y" of git://github.com/raspberrypi/linux.git was used
+ * as a hardware reference for the Broadcom BCM2835 watchdog timer.
+ *
+ * Copyright (C) 2013 Lubomir Rintel <lkundrak@v3.sk>
+ *
+ * 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/types.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/miscdevice.h>
+
+#define PM_RSTC                         0x1c
+#define PM_WDOG                         0x24
+
+#define PM_PASSWORD                     0x5a000000
+
+#define PM_WDOG_TIME_SET                0x000fffff
+#define PM_RSTC_WRCFG_CLR               0xffffffcf
+#define PM_RSTC_WRCFG_SET               0x00000030
+#define PM_RSTC_WRCFG_FULL_RESET        0x00000020
+#define PM_RSTC_RESET                   0x00000102
+
+#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
+#define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
+
+struct bcm2835_wdt {
+        void __iomem            *base;
+        spinlock_t              lock;
+};
+
+static unsigned int heartbeat;
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+static int bcm2835_wdt_start(struct watchdog_device *wdog)
+{
+        struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog);
+        uint32_t cur;
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdt->lock, flags);
+
+        writel_relaxed(PM_PASSWORD | (SECS_TO_WDOG_TICKS(wdog->timeout) &
+                                PM_WDOG_TIME_SET), wdt->base + PM_WDOG);
+        cur = readl_relaxed(wdt->base + PM_RSTC);
+        writel_relaxed(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) |
+                  PM_RSTC_WRCFG_FULL_RESET, wdt->base + PM_RSTC);
+
+        spin_unlock_irqrestore(&wdt->lock, flags);
+
+        return 0;
+}
+
+static int bcm2835_wdt_stop(struct watchdog_device *wdog)
+{
+        struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog);
+
+        writel_relaxed(PM_PASSWORD | PM_RSTC_RESET, wdt->base + PM_RSTC);
+        dev_info(wdog->dev, "Watchdog timer stopped");
+        return 0;
+}
+
+static int bcm2835_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t)
+{
+        wdog->timeout = t;
+        return 0;
+}
+
+static unsigned int bcm2835_wdt_get_timeleft(struct watchdog_device *wdog)
+{
+        struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog);
+
+        uint32_t ret = readl_relaxed(wdt->base + PM_WDOG);
+        return WDOG_TICKS_TO_SECS(ret & PM_WDOG_TIME_SET);
+}
+
+static struct watchdog_ops bcm2835_wdt_ops = {
+        .owner =        THIS_MODULE,
+        .start =        bcm2835_wdt_start,
+        .stop =         bcm2835_wdt_stop,
+        .set_timeout =  bcm2835_wdt_set_timeout,
+        .get_timeleft = bcm2835_wdt_get_timeleft,
+};
+
+static struct watchdog_info bcm2835_wdt_info = {
+        .options =      WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
+                        WDIOF_KEEPALIVEPING,
+        .identity =     "Broadcom BCM2835 Watchdog timer",
+};
+
+static struct watchdog_device bcm2835_wdt_wdd = {
+        .info =         &bcm2835_wdt_info,
+        .ops =          &bcm2835_wdt_ops,
+        .min_timeout =  1,
+        .max_timeout =  WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET),
+        .timeout =      WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET),
+};
+
+static int bcm2835_wdt_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct device_node *np = dev->of_node;
+        struct bcm2835_wdt *wdt;
+        int err;
+
+        wdt = devm_kzalloc(dev, sizeof(struct bcm2835_wdt), GFP_KERNEL);
+        if (!wdt) {
+                dev_err(dev, "Failed to allocate memory for watchdog device");
+                return -ENOMEM;
+        }
+        platform_set_drvdata(pdev, wdt);
+
+        spin_lock_init(&wdt->lock);
+
+        wdt->base = of_iomap(np, 0);
+        if (!wdt->base) {
+                dev_err(dev, "Failed to remap watchdog regs");
+                return -ENODEV;
+        }
+
+        watchdog_set_drvdata(&bcm2835_wdt_wdd, wdt);
+        watchdog_init_timeout(&bcm2835_wdt_wdd, heartbeat, dev);
+        watchdog_set_nowayout(&bcm2835_wdt_wdd, nowayout);
+        err = watchdog_register_device(&bcm2835_wdt_wdd);
+        if (err) {
+                dev_err(dev, "Failed to register watchdog device");
+                iounmap(wdt->base);
+                return err;
+        }
+
+        dev_info(dev, "Broadcom BCM2835 watchdog timer");
+        return 0;
+}
+
+static int bcm2835_wdt_remove(struct platform_device *pdev)
+{
+        struct bcm2835_wdt *wdt = platform_get_drvdata(pdev);
+
+        watchdog_unregister_device(&bcm2835_wdt_wdd);
+        iounmap(wdt->base);
+
+        return 0;
+}
+
+static void bcm2835_wdt_shutdown(struct platform_device *pdev)
+{
+        bcm2835_wdt_stop(&bcm2835_wdt_wdd);
+}
+
+static const struct of_device_id bcm2835_wdt_of_match[] = {
+        { .compatible = "brcm,bcm2835-pm-wdt", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_wdt_of_match);
+
+static struct platform_driver bcm2835_wdt_driver = {
+        .probe          = bcm2835_wdt_probe,
+        .remove         = bcm2835_wdt_remove,
+        .shutdown       = bcm2835_wdt_shutdown,
+        .driver = {
+                .name =         "bcm2835-wdt",
+                .owner =        THIS_MODULE,
+                .of_match_table = bcm2835_wdt_of_match,
+        },
+};
+module_platform_driver(bcm2835_wdt_driver);
+
+module_param(heartbeat, uint, 0);
+MODULE_PARM_DESC(heartbeat, "Initial 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_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
+MODULE_DESCRIPTION("Driver for Broadcom BCM2835 watchdog timer");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);