watchdog: add driver for the Atheros AR71XX/AR724X/AR913X SoCs

This patch adds a driver for the built-in hardware watchdog device
of the Atheros AR71XX/AR724X/AR913X SoCs.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

3 files changed, 313 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index db00fa9f6979..68a9527f92d0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -866,6 +866,13 @@ config SBC_EPX_C3_WATCHDOG
 
 # MIPS Architecture
 
+config ATH79_WDT
+        tristate "Atheros AR71XX/AR724X/AR913X hardware watchdog"
+        depends on ATH79
+        help
+          Hardware driver for the built-in watchdog timer on the Atheros
+          AR71XX/AR724X/AR913X SoCs.
+
 config BCM47XX_WDT
         tristate "Broadcom BCM47xx Watchdog Timer"
         depends on BCM47XX
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index cd77f5492f95..9b6b33a02072 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -110,6 +110,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
 # M68KNOMMU Architecture
 
 # MIPS Architecture
+obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o
 obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
 obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
new file mode 100644
index 000000000000..725c84bfdd76
--- /dev/null
+++ b/drivers/watchdog/ath79_wdt.c
@@ -0,0 +1,305 @@
+/*
+ * Atheros AR71XX/AR724X/AR913X built-in hardware watchdog timer.
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * This driver was based on: drivers/watchdog/ixp4xx_wdt.c
+ *      Author: Deepak Saxena <dsaxena@plexity.net>
+ *      Copyright 2004 (c) MontaVista, Software, Inc.
+ *
+ * which again was based on sa1100 driver,
+ *      Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+
+#define DRIVER_NAME     "ath79-wdt"
+
+#define WDT_TIMEOUT     15      /* seconds */
+
+#define WDOG_CTRL_LAST_RESET    BIT(31)
+#define WDOG_CTRL_ACTION_MASK   3
+#define WDOG_CTRL_ACTION_NONE   0       /* no action */
+#define WDOG_CTRL_ACTION_GPI    1       /* general purpose interrupt */
+#define WDOG_CTRL_ACTION_NMI    2       /* NMI */
+#define WDOG_CTRL_ACTION_FCR    3       /* full chip reset */
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+                           "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int timeout = WDT_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds "
+                          "(default=" __MODULE_STRING(WDT_TIMEOUT) "s)");
+
+static unsigned long wdt_flags;
+
+#define WDT_FLAGS_BUSY          0
+#define WDT_FLAGS_EXPECT_CLOSE  1
+
+static struct clk *wdt_clk;
+static unsigned long wdt_freq;
+static int boot_status;
+static int max_timeout;
+
+static inline void ath79_wdt_keepalive(void)
+{
+        ath79_reset_wr(AR71XX_RESET_REG_WDOG, wdt_freq * timeout);
+}
+
+static inline void ath79_wdt_enable(void)
+{
+        ath79_wdt_keepalive();
+        ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR);
+}
+
+static inline void ath79_wdt_disable(void)
+{
+        ath79_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_NONE);
+}
+
+static int ath79_wdt_set_timeout(int val)
+{
+        if (val < 1 || val > max_timeout)
+                return -EINVAL;
+
+        timeout = val;
+        ath79_wdt_keepalive();
+
+        return 0;
+}
+
+static int ath79_wdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(WDT_FLAGS_BUSY, &wdt_flags))
+                return -EBUSY;
+
+        clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
+        ath79_wdt_enable();
+
+        return nonseekable_open(inode, file);
+}
+
+static int ath79_wdt_release(struct inode *inode, struct file *file)
+{
+        if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags))
+                ath79_wdt_disable();
+        else {
+                pr_crit(DRIVER_NAME ": device closed unexpectedly, "
+                        "watchdog timer will not stop!\n");
+                ath79_wdt_keepalive();
+        }
+
+        clear_bit(WDT_FLAGS_BUSY, &wdt_flags);
+        clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
+
+        return 0;
+}
+
+static ssize_t ath79_wdt_write(struct file *file, const char *data,
+                                size_t len, loff_t *ppos)
+{
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
+
+                        for (i = 0; i != len; i++) {
+                                char c;
+
+                                if (get_user(c, data + i))
+                                        return -EFAULT;
+
+                                if (c == 'V')
+                                        set_bit(WDT_FLAGS_EXPECT_CLOSE,
+                                                &wdt_flags);
+                        }
+                }
+
+                ath79_wdt_keepalive();
+        }
+
+        return len;
+}
+
+static const struct watchdog_info ath79_wdt_info = {
+        .options                = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+                                  WDIOF_MAGICCLOSE | WDIOF_CARDRESET,
+        .firmware_version       = 0,
+        .identity               = "ATH79 watchdog",
+};
+
+static long ath79_wdt_ioctl(struct file *file, unsigned int cmd,
+                            unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        int err;
+        int t;
+
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                err = copy_to_user(argp, &ath79_wdt_info,
+                                   sizeof(ath79_wdt_info)) ? -EFAULT : 0;
+                break;
+
+        case WDIOC_GETSTATUS:
+                err = put_user(0, p);
+                break;
+
+        case WDIOC_GETBOOTSTATUS:
+                err = put_user(boot_status, p);
+                break;
+
+        case WDIOC_KEEPALIVE:
+                ath79_wdt_keepalive();
+                err = 0;
+                break;
+
+        case WDIOC_SETTIMEOUT:
+                err = get_user(t, p);
+                if (err)
+                        break;
+
+                err = ath79_wdt_set_timeout(t);
+                if (err)
+                        break;
+
+                /* fallthrough */
+        case WDIOC_GETTIMEOUT:
+                err = put_user(timeout, p);
+                break;
+
+        default:
+                err = -ENOTTY;
+                break;
+        }
+
+        return err;
+}
+
+static const struct file_operations ath79_wdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = ath79_wdt_write,
+        .unlocked_ioctl = ath79_wdt_ioctl,
+        .open           = ath79_wdt_open,
+        .release        = ath79_wdt_release,
+};
+
+static struct miscdevice ath79_wdt_miscdev = {
+        .minor = WATCHDOG_MINOR,
+        .name = "watchdog",
+        .fops = &ath79_wdt_fops,
+};
+
+static int __devinit ath79_wdt_probe(struct platform_device *pdev)
+{
+        u32 ctrl;
+        int err;
+
+        wdt_clk = clk_get(&pdev->dev, "wdt");
+        if (IS_ERR(wdt_clk))
+                return PTR_ERR(wdt_clk);
+
+        err = clk_enable(wdt_clk);
+        if (err)
+                goto err_clk_put;
+
+        wdt_freq = clk_get_rate(wdt_clk);
+        if (!wdt_freq) {
+                err = -EINVAL;
+                goto err_clk_disable;
+        }
+
+        max_timeout = (0xfffffffful / wdt_freq);
+        if (timeout < 1 || timeout > max_timeout) {
+                timeout = max_timeout;
+                dev_info(&pdev->dev,
+                        "timeout value must be 0 < timeout < %d, using %d\n",
+                        max_timeout, timeout);
+        }
+
+        ctrl = ath79_reset_rr(AR71XX_RESET_REG_WDOG_CTRL);
+        boot_status = (ctrl & WDOG_CTRL_LAST_RESET) ? WDIOF_CARDRESET : 0;
+
+        err = misc_register(&ath79_wdt_miscdev);
+        if (err) {
+                dev_err(&pdev->dev,
+                        "unable to register misc device, err=%d\n", err);
+                goto err_clk_disable;
+        }
+
+        return 0;
+
+err_clk_disable:
+        clk_disable(wdt_clk);
+err_clk_put:
+        clk_put(wdt_clk);
+        return err;
+}
+
+static int __devexit ath79_wdt_remove(struct platform_device *pdev)
+{
+        misc_deregister(&ath79_wdt_miscdev);
+        clk_disable(wdt_clk);
+        clk_put(wdt_clk);
+        return 0;
+}
+
+static void ath97_wdt_shutdown(struct platform_device *pdev)
+{
+        ath79_wdt_disable();
+}
+
+static struct platform_driver ath79_wdt_driver = {
+        .remove         = __devexit_p(ath79_wdt_remove),
+        .shutdown       = ath97_wdt_shutdown,
+        .driver         = {
+                .name   = DRIVER_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init ath79_wdt_init(void)
+{
+        return platform_driver_probe(&ath79_wdt_driver, ath79_wdt_probe);
+}
+module_init(ath79_wdt_init);
+
+static void __exit ath79_wdt_exit(void)
+{
+        platform_driver_unregister(&ath79_wdt_driver);
+}
+module_exit(ath79_wdt_exit);
+
+MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X hardware watchdog driver");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
+MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);