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238 lines
5.9 KiB
238 lines
5.9 KiB
--- /dev/null
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+++ b/drivers/watchdog/ar2315-wtd.c
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@@ -0,0 +1,209 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
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+ *
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+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
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+ * Based on EP93xx and ifxmips wdt driver
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+ */
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+
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+#include <linux/interrupt.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/miscdevice.h>
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+#include <linux/watchdog.h>
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+#include <linux/fs.h>
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+#include <linux/ioport.h>
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+#include <linux/notifier.h>
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+#include <linux/reboot.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <linux/io.h>
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+#include <linux/uaccess.h>
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+
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+#define DRIVER_NAME "ar2315-wdt"
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+
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+#define CLOCK_RATE 40000000
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+#define HEARTBEAT(x) (x < 1 || x > 90 ? 20 : x)
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+
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+#define WDT_REG_TIMER 0x00
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+#define WDT_REG_CTRL 0x04
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+
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+#define WDT_CTRL_ACT_NONE 0x00000000 /* No action */
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+#define WDT_CTRL_ACT_NMI 0x00000001 /* NMI on watchdog */
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+#define WDT_CTRL_ACT_RESET 0x00000002 /* reset on watchdog */
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+
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+static int wdt_timeout = 20;
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+static int started;
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+static int in_use;
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+static void __iomem *wdt_base;
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+
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+static inline void ar2315_wdt_wr(unsigned reg, u32 val)
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+{
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+ iowrite32(val, wdt_base + reg);
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+}
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+
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+static void
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+ar2315_wdt_enable(void)
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+{
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+ ar2315_wdt_wr(WDT_REG_TIMER, wdt_timeout * CLOCK_RATE);
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+}
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+
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+static ssize_t
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+ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
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+ loff_t *ppos)
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+{
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+ if (len)
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+ ar2315_wdt_enable();
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+ return len;
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+}
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+
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+static int
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+ar2315_wdt_open(struct inode *inode, struct file *file)
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+{
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+ if (in_use)
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+ return -EBUSY;
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+ ar2315_wdt_enable();
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+ in_use = 1;
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+ started = 1;
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+ return nonseekable_open(inode, file);
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+}
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+
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+static int
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+ar2315_wdt_release(struct inode *inode, struct file *file)
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+{
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+ in_use = 0;
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+ return 0;
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+}
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+
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+static irqreturn_t
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+ar2315_wdt_interrupt(int irq, void *dev)
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+{
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+ struct platform_device *pdev = (struct platform_device *)dev;
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+
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+ if (started) {
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+ dev_crit(&pdev->dev, "watchdog expired, rebooting system\n");
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+ emergency_restart();
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+ } else {
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+ ar2315_wdt_wr(WDT_REG_CTRL, 0);
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+ ar2315_wdt_wr(WDT_REG_TIMER, 0);
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+ }
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+ return IRQ_HANDLED;
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+}
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+
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+static struct watchdog_info ident = {
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+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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+ .identity = "ar2315 Watchdog",
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+};
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+
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+static long
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+ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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+{
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+ int new_wdt_timeout;
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+ int ret = -ENOIOCTLCMD;
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+
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+ switch (cmd) {
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+ case WDIOC_GETSUPPORT:
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+ ret = copy_to_user((void __user *)arg, &ident, sizeof(ident)) ?
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+ -EFAULT : 0;
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+ break;
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+ case WDIOC_KEEPALIVE:
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+ ar2315_wdt_enable();
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+ ret = 0;
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+ break;
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+ case WDIOC_SETTIMEOUT:
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+ ret = get_user(new_wdt_timeout, (int __user *)arg);
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+ if (ret)
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+ break;
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+ wdt_timeout = HEARTBEAT(new_wdt_timeout);
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+ ar2315_wdt_enable();
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+ break;
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+ case WDIOC_GETTIMEOUT:
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+ ret = put_user(wdt_timeout, (int __user *)arg);
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+ break;
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+ }
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+ return ret;
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+}
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+
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+static const struct file_operations ar2315_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .write = ar2315_wdt_write,
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+ .unlocked_ioctl = ar2315_wdt_ioctl,
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+ .open = ar2315_wdt_open,
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+ .release = ar2315_wdt_release,
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+};
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+
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+static struct miscdevice ar2315_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &ar2315_wdt_fops,
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+};
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+
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+static int
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+ar2315_wdt_probe(struct platform_device *dev)
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+{
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+ struct resource *mem_res, *irq_res;
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+ int ret = 0;
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+
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+ if (wdt_base)
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+ return -EBUSY;
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+
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+ irq_res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
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+ if (!irq_res) {
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+ dev_err(&dev->dev, "no IRQ resource\n");
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+ return -ENOENT;
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+ }
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+
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+ mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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+ wdt_base = devm_ioremap_resource(&dev->dev, mem_res);
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+ if (IS_ERR(wdt_base))
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+ return PTR_ERR(wdt_base);
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+
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+ ret = devm_request_irq(&dev->dev, irq_res->start, ar2315_wdt_interrupt,
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+ IRQF_DISABLED, DRIVER_NAME, dev);
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+ if (ret) {
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+ dev_err(&dev->dev, "failed to register inetrrupt\n");
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+ goto out;
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+ }
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+
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+ ret = misc_register(&ar2315_wdt_miscdev);
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+ if (ret)
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+ dev_err(&dev->dev, "failed to register miscdev\n");
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+
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+out:
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+ return ret;
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+}
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+
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+static int
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+ar2315_wdt_remove(struct platform_device *dev)
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+{
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+ misc_deregister(&ar2315_wdt_miscdev);
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+ return 0;
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+}
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+
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+static struct platform_driver ar2315_wdt_driver = {
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+ .probe = ar2315_wdt_probe,
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+ .remove = ar2315_wdt_remove,
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+ .driver = {
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+ .name = DRIVER_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+module_platform_driver(ar2315_wdt_driver);
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+
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+MODULE_DESCRIPTION("Atheros AR2315 hardware watchdog driver");
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+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:" DRIVER_NAME);
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -1202,6 +1202,13 @@ config RALINK_WDT
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help
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Hardware driver for the Ralink SoC Watchdog Timer.
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+config AR2315_WDT
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+ tristate "Atheros AR2315+ WiSoCs Watchdog Timer"
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+ depends on ATHEROS_AR231X
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+ help
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+ Hardware driver for the built-in watchdog timer on the Atheros
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+ AR2315/AR2316 WiSoCs.
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+
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# PARISC Architecture
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# POWERPC Architecture
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -134,6 +134,7 @@ obj-$(CONFIG_GPIO_WDT) += old_gpio_wdt.o
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obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
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obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
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obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
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+obj-$(CONFIG_AR2315_WDT) += ar2315-wtd.o
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obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
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obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
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octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
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