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497 lines
12 KiB
Diff
497 lines
12 KiB
Diff
--- /dev/null
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+++ b/drivers/watchdog/cns3xxx_wdt.c
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@@ -0,0 +1,465 @@
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+/*******************************************************************************
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+ *
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+ * drivers/watchdog/cns3xxx_wdt.c
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+ *
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+ * Watchdog timer driver for the CNS3XXX SOCs
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+ *
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+ * Author: Scott Shu
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+ *
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+ * Copyright (c) 2008 Cavium Networks
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+ *
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+ * This file is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License, Version 2, as
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+ * published by the Free Software Foundation.
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+ *
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+ * This file is distributed in the hope that it will be useful,
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+ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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+ * NONINFRINGEMENT. See the 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 file; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
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+ * visit http://www.gnu.org/licenses/.
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+ *
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+ * This file may also be available under a different license from Cavium.
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+ * Contact Cavium Networks for more information
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+ *
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+ ******************************************************************************/
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+
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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/reboot.h>
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+#include <linux/init.h>
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+#include <linux/interrupt.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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+#include <asm/hardware/arm_twd.h>
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+
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+struct cns3xxx_wdt {
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+ unsigned long timer_alive;
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+ struct device *dev;
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+ void __iomem *base;
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+ int irq;
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+ unsigned int perturb;
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+ char expect_close;
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+};
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+
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+static struct platform_device *cns3xxx_wdt_dev;
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+extern unsigned int twd_timer_rate;
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+static spinlock_t wdt_lock;
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+
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+#define TIMER_MARGIN 60
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+static int cns3xxx_margin = TIMER_MARGIN;
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+module_param(cns3xxx_margin, int, 0);
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+MODULE_PARM_DESC(cns3xxx_margin,
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+ "CNS3XXX timer margin in seconds. (0 < cns3xxx_margin < 65536, default="
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+ __MODULE_STRING(TIMER_MARGIN) ")");
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+
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+static int nowayout = WATCHDOG_NOWAYOUT;
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+module_param(nowayout, int, 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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+
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+#define ONLY_TESTING 0
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+static int cns3xxx_noboot = ONLY_TESTING;
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+module_param(cns3xxx_noboot, int, 0);
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+MODULE_PARM_DESC(cns3xxx_noboot, "CNS3XXX watchdog action, "
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+ "set to 1 to ignore reboots, 0 to reboot (default="
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+ __MODULE_STRING(ONLY_TESTING) ")");
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+
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+/*
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+ * This is the interrupt handler. Note that we only use this
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+ * in testing mode, so don't actually do a reboot here.
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+ */
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+static irqreturn_t cns3xxx_wdt_fire(int irq, void *arg)
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+{
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+ struct cns3xxx_wdt *wdt = arg;
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+
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+ /* Check it really was our interrupt */
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+ if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
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+ dev_printk(KERN_CRIT, wdt->dev,
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+ "Triggered - Reboot ignored.\n");
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+ /* Clear the interrupt on the watchdog */
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+ writel(1, wdt->base + TWD_WDOG_INTSTAT);
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+ return IRQ_HANDLED;
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+ }
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+ return IRQ_NONE;
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+}
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+
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+/*
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+ * cns3xxx_wdt_keepalive - reload the timer
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+ *
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+ * Note that the spec says a DIFFERENT value must be written to the reload
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+ * register each time. The "perturb" variable deals with this by adding 1
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+ * to the count every other time the function is called.
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+ */
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+static void cns3xxx_wdt_keepalive(struct cns3xxx_wdt *wdt)
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+{
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+ unsigned int count;
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+
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+ /* Assume prescale is set to 256 */
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+ count = (twd_timer_rate / 256) * cns3xxx_margin;
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+
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+ /* Reload the counter */
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+ spin_lock(&wdt_lock);
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+ writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
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+ wdt->perturb = wdt->perturb ? 0 : 1;
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+ spin_unlock(&wdt_lock);
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+}
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+
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+static void cns3xxx_wdt_stop(struct cns3xxx_wdt *wdt)
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+{
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+ spin_lock(&wdt_lock);
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+ writel(0x12345678, wdt->base + TWD_WDOG_DISABLE);
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+ writel(0x87654321, wdt->base + TWD_WDOG_DISABLE);
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+ writel(0x0, wdt->base + TWD_WDOG_CONTROL);
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+ spin_unlock(&wdt_lock);
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+}
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+
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+static void cns3xxx_wdt_start(struct cns3xxx_wdt *wdt)
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+{
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+ dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
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+
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+ //spin_lock(&wdt_lock);
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+ /* This loads the count register but does NOT start the count yet */
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+ cns3xxx_wdt_keepalive(wdt);
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+ spin_lock(&wdt_lock);
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+
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+ if (cns3xxx_noboot) {
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+ /* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */
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+ writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL);
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+ } else {
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+ /* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */
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+ writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL);
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+ }
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+ spin_unlock(&wdt_lock);
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+}
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+
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+static int cns3xxx_wdt_set_heartbeat(int t)
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+{
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+ if (t < 0x0001 || t > 0xFFFF)
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+ return -EINVAL;
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+
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+ cns3xxx_margin = t;
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+ return 0;
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+}
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+
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+/*
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+ * /dev/watchdog handling
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+ */
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+static int cns3xxx_wdt_open(struct inode *inode, struct file *file)
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+{
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+ struct cns3xxx_wdt *wdt = platform_get_drvdata(cns3xxx_wdt_dev);
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+
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+ if (test_and_set_bit(0, &wdt->timer_alive))
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+ return -EBUSY;
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+
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+ if (nowayout)
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+ __module_get(THIS_MODULE);
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+
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+ file->private_data = wdt;
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+
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+ /*
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+ * Activate timer
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+ */
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+ cns3xxx_wdt_start(wdt);
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+
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+ return nonseekable_open(inode, file);
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+}
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+
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+static int cns3xxx_wdt_release(struct inode *inode, struct file *file)
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+{
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+ struct cns3xxx_wdt *wdt = file->private_data;
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+
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+ /*
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+ * Shut off the timer.
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+ * Lock it in if it's a module and we set nowayout
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+ */
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+ if (wdt->expect_close == 42)
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+ cns3xxx_wdt_stop(wdt);
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+ else {
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+ dev_printk(KERN_CRIT, wdt->dev,
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+ "unexpected close, not stopping watchdog!\n");
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+ cns3xxx_wdt_keepalive(wdt);
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+ }
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+ clear_bit(0, &wdt->timer_alive);
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+ wdt->expect_close = 0;
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+ return 0;
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+}
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+
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+static ssize_t cns3xxx_wdt_write(struct file *file, const char *data,
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+ size_t len, loff_t *ppos)
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+{
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+ struct cns3xxx_wdt *wdt = file->private_data;
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+
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+ /*
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+ * Refresh the timer.
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+ */
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+ if (len) {
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+ if (!nowayout) {
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+ size_t i;
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+
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+ /* In case it was set long ago */
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+ wdt->expect_close = 0;
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+
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+ for (i = 0; i != len; i++) {
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+ char c;
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+
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+ if (get_user(c, data + i))
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+ return -EFAULT;
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+ if (c == 'V')
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+ wdt->expect_close = 42;
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+ }
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+ }
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+ cns3xxx_wdt_keepalive(wdt);
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+ }
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+ return len;
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+}
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+
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+static struct watchdog_info ident = {
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+ .options = WDIOF_SETTIMEOUT |
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+ WDIOF_KEEPALIVEPING |
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+ WDIOF_MAGICCLOSE,
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+ .identity = "CNS3XXX Watchdog",
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+};
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+
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+static long cns3xxx_wdt_ioctl(struct file *file, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ struct cns3xxx_wdt *wdt = file->private_data;
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+ int ret;
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+ union {
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+ struct watchdog_info ident;
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+ int i;
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+ } uarg;
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+
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+ if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg))
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+ return -ENOTTY;
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+
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+ if (_IOC_DIR(cmd) & _IOC_WRITE) {
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+ ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd));
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+ if (ret)
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+ return -EFAULT;
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+ }
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+
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+ switch (cmd) {
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+ case WDIOC_GETSUPPORT:
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+ uarg.ident = ident;
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+ ret = 0;
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+ break;
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+
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+ case WDIOC_GETSTATUS:
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+ case WDIOC_GETBOOTSTATUS:
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+ uarg.i = 0;
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+ ret = 0;
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+ break;
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+
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+ case WDIOC_SETOPTIONS:
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+ ret = -EINVAL;
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+ if (uarg.i & WDIOS_DISABLECARD) {
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+ cns3xxx_wdt_stop(wdt);
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+ ret = 0;
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+ }
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+ if (uarg.i & WDIOS_ENABLECARD) {
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+ cns3xxx_wdt_start(wdt);
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+ ret = 0;
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+ }
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+ break;
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+
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+ case WDIOC_KEEPALIVE:
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+ cns3xxx_wdt_keepalive(wdt);
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+ ret = 0;
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+ break;
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+
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+ case WDIOC_SETTIMEOUT:
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+ ret = cns3xxx_wdt_set_heartbeat(uarg.i);
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+ if (ret)
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+ break;
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+
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+ cns3xxx_wdt_keepalive(wdt);
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+ /* Fall */
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+ case WDIOC_GETTIMEOUT:
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+ uarg.i = cns3xxx_margin;
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+ ret = 0;
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+ break;
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+
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+ default:
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+ return -ENOTTY;
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+ }
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+
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+ if (ret == 0 && _IOC_DIR(cmd) & _IOC_READ) {
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+ ret = copy_to_user((void __user *)arg, &uarg, _IOC_SIZE(cmd));
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+ if (ret)
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+ ret = -EFAULT;
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+ }
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+ return ret;
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+}
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+
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+/*
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+ * System shutdown handler. Turn off the watchdog if we're
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+ * restarting or halting the system.
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+ */
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+static void cns3xxx_wdt_shutdown(struct platform_device *dev)
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+{
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+ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
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+
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+ if (system_state == SYSTEM_RESTART || system_state == SYSTEM_HALT)
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+ cns3xxx_wdt_stop(wdt);
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+}
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+
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+/*
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+ * Kernel Interfaces
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+ */
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+static const struct file_operations cns3xxx_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .write = cns3xxx_wdt_write,
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+ .unlocked_ioctl = cns3xxx_wdt_ioctl,
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+ .open = cns3xxx_wdt_open,
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+ .release = cns3xxx_wdt_release,
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+};
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+
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+static struct miscdevice cns3xxx_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &cns3xxx_wdt_fops,
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+};
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+
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+static int __devinit cns3xxx_wdt_probe(struct platform_device *dev)
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+{
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+ struct cns3xxx_wdt *wdt;
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+ struct resource *res;
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+ int ret;
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+
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+ /* We only accept one device, and it must have an id of -1 */
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+ if (dev->id != -1)
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+ return -ENODEV;
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+
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+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ ret = -ENODEV;
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+ goto err_out;
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+ }
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+
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+ wdt = kzalloc(sizeof(struct cns3xxx_wdt), GFP_KERNEL);
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+ if (!wdt) {
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+ ret = -ENOMEM;
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+ goto err_out;
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+ }
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+
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+ wdt->dev = &dev->dev;
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+ wdt->irq = platform_get_irq(dev, 0);
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+ if (wdt->irq < 0) {
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+ ret = -ENXIO;
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+ goto err_free;
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+ }
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+ wdt->base = ioremap(res->start, res->end - res->start + 1);
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+ if (!wdt->base) {
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+ ret = -ENOMEM;
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+ goto err_free;
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+ }
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+
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+ cns3xxx_wdt_miscdev.parent = &dev->dev;
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+ ret = misc_register(&cns3xxx_wdt_miscdev);
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+ if (ret) {
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+ dev_printk(KERN_ERR, wdt->dev,
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+ "cannot register miscdev on minor=%d (err=%d)\n",
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+ WATCHDOG_MINOR, ret);
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+ goto err_misc;
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+ }
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+
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+ ret = request_irq(wdt->irq, cns3xxx_wdt_fire, IRQF_DISABLED,
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+ dev->name, wdt);
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+ if (ret) {
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+ dev_printk(KERN_ERR, wdt->dev,
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+ "cannot register IRQ%d for watchdog\n", wdt->irq);
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+ goto err_irq;
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+ }
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+
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+ cns3xxx_wdt_stop(wdt);
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+ platform_set_drvdata(dev, wdt);
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+ cns3xxx_wdt_dev = dev;
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+
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+ return 0;
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+
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+err_irq:
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+ misc_deregister(&cns3xxx_wdt_miscdev);
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+err_misc:
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+ platform_set_drvdata(dev, NULL);
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+ iounmap(wdt->base);
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+err_free:
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+ kfree(wdt);
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+err_out:
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+ return ret;
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+}
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+
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+static int __devexit cns3xxx_wdt_remove(struct platform_device *dev)
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+{
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+ struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
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+
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+ platform_set_drvdata(dev, NULL);
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+
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+ misc_deregister(&cns3xxx_wdt_miscdev);
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+
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+ cns3xxx_wdt_dev = NULL;
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+
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+ free_irq(wdt->irq, wdt);
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+ iounmap(wdt->base);
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+ kfree(wdt);
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+ return 0;
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+}
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+
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+
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+static struct platform_driver cns3xxx_wdt_driver = {
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+ .probe = cns3xxx_wdt_probe,
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+ .remove = __devexit_p(cns3xxx_wdt_remove),
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+ .shutdown = cns3xxx_wdt_shutdown,
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "cns3xxx-wdt",
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+ },
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+};
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+
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+static char banner[] __initdata = KERN_INFO
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+ "CNS3XXX Watchdog Timer, noboot=%d margin=%d sec (nowayout= %d)\n";
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+
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+static int __init cns3xxx_wdt_init(void)
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+{
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+ /*
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+ * Check that the margin value is within it's range;
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+ * if not reset to the default
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+ */
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+ if (cns3xxx_wdt_set_heartbeat(cns3xxx_margin)) {
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+ cns3xxx_wdt_set_heartbeat(TIMER_MARGIN);
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+ printk(KERN_INFO "cns3xxx_margin value must be 0 < cns3xxx_margin < 65536, using %d\n",
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+ TIMER_MARGIN);
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+ }
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+
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+ printk(banner, cns3xxx_noboot, cns3xxx_margin, nowayout);
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+
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+ spin_lock_init(&wdt_lock);
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+
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+ return platform_driver_register(&cns3xxx_wdt_driver);
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+}
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+
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+static void __exit cns3xxx_wdt_exit(void)
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+{
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+ platform_driver_unregister(&cns3xxx_wdt_driver);
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+}
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+
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+module_init(cns3xxx_wdt_init);
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+module_exit(cns3xxx_wdt_exit);
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+
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+MODULE_AUTHOR("Scott Shu");
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+MODULE_DESCRIPTION("CNS3XXX Watchdog Device Driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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+MODULE_ALIAS("platform:cns3xxx-wdt");
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -231,6 +231,15 @@ config DAVINCI_WATCHDOG
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NOTE: once enabled, this timer cannot be disabled.
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Say N if you are unsure.
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|
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+config CNS3XXX_WATCHDOG
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+ tristate "CNS3XXX watchdog"
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+ depends on ARCH_CNS3XXX && LOCAL_TIMERS
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+ help
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+ Watchdog timer embedded into the CNS3XXX SoCs system.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called cns3xxx_wdt.
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+
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config ORION_WATCHDOG
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tristate "Orion watchdog"
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depends on ARCH_ORION5X || ARCH_KIRKWOOD
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -41,6 +41,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_
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obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
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obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
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obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
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+obj-$(CONFIG_CNS3XXX_WATCHDOG) += cns3xxx_wdt.o
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obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
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obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
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obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
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