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-rw-r--r--drivers/watchdog/Kconfig1
-rw-r--r--drivers/watchdog/davinci_wdt.c147
2 files changed, 36 insertions, 112 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 1491f0f4d41d..b69a0f763a6d 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -271,6 +271,7 @@ config IOP_WATCHDOG
config DAVINCI_WATCHDOG
tristate "DaVinci watchdog"
depends on ARCH_DAVINCI
+ select WATCHDOG_CORE
help
Say Y here if to include support for the watchdog timer
in the DaVinci DM644x/DM646x processors.
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 12591f6596ef..bb8f23cd449a 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -3,7 +3,7 @@
*
* Watchdog driver for DaVinci DM644x/DM646x processors
*
- * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2006-2013 Texas Instruments.
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
@@ -15,18 +15,12 @@
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
-#include <linux/bitops.h>
#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/clk.h>
-#include <linux/slab.h>
#include <linux/err.h>
#define MODULE_NAME "DAVINCI-WDT: "
@@ -61,31 +55,12 @@
#define WDKEY_SEQ0 (0xa5c6 << 16)
#define WDKEY_SEQ1 (0xda7e << 16)
-static int heartbeat = DEFAULT_HEARTBEAT;
-
-static DEFINE_SPINLOCK(io_lock);
-static unsigned long wdt_status;
-#define WDT_IN_USE 0
-#define WDT_OK_TO_CLOSE 1
-#define WDT_REGION_INITED 2
-#define WDT_DEVICE_INITED 3
-
+static int heartbeat;
static void __iomem *wdt_base;
struct clk *wdt_clk;
+static struct watchdog_device wdt_wdd;
-static void wdt_service(void)
-{
- spin_lock(&io_lock);
-
- /* put watchdog in service state */
- iowrite32(WDKEY_SEQ0, wdt_base + WDTCR);
- /* put watchdog in active state */
- iowrite32(WDKEY_SEQ1, wdt_base + WDTCR);
-
- spin_unlock(&io_lock);
-}
-
-static void wdt_enable(void)
+static int davinci_wdt_start(struct watchdog_device *wdd)
{
u32 tgcr;
u32 timer_margin;
@@ -93,8 +68,6 @@ static void wdt_enable(void)
wdt_freq = clk_get_rate(wdt_clk);
- spin_lock(&io_lock);
-
/* disable, internal clock source */
iowrite32(0, wdt_base + TCR);
/* reset timer, set mode to 64-bit watchdog, and unreset */
@@ -105,9 +78,9 @@ static void wdt_enable(void)
iowrite32(0, wdt_base + TIM12);
iowrite32(0, wdt_base + TIM34);
/* set timeout period */
- timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
+ timer_margin = (((u64)wdd->timeout * wdt_freq) & 0xffffffff);
iowrite32(timer_margin, wdt_base + PRD12);
- timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
+ timer_margin = (((u64)wdd->timeout * wdt_freq) >> 32);
iowrite32(timer_margin, wdt_base + PRD34);
/* enable run continuously */
iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
@@ -119,84 +92,28 @@ static void wdt_enable(void)
iowrite32(WDKEY_SEQ0 | WDEN, wdt_base + WDTCR);
/* put watchdog in active state */
iowrite32(WDKEY_SEQ1 | WDEN, wdt_base + WDTCR);
-
- spin_unlock(&io_lock);
-}
-
-static int davinci_wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(WDT_IN_USE, &wdt_status))
- return -EBUSY;
-
- wdt_enable();
-
- return nonseekable_open(inode, file);
+ return 0;
}
-static ssize_t
-davinci_wdt_write(struct file *file, const char *data, size_t len,
- loff_t *ppos)
+static int davinci_wdt_ping(struct watchdog_device *wdd)
{
- if (len)
- wdt_service();
-
- return len;
+ /* put watchdog in service state */
+ iowrite32(WDKEY_SEQ0, wdt_base + WDTCR);
+ /* put watchdog in active state */
+ iowrite32(WDKEY_SEQ1, wdt_base + WDTCR);
+ return 0;
}
-static const struct watchdog_info ident = {
+static const struct watchdog_info davinci_wdt_info = {
.options = WDIOF_KEEPALIVEPING,
.identity = "DaVinci Watchdog",
};
-static long davinci_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int ret = -ENOTTY;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- ret = copy_to_user((struct watchdog_info *)arg, &ident,
- sizeof(ident)) ? -EFAULT : 0;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- ret = put_user(0, (int *)arg);
- break;
-
- case WDIOC_KEEPALIVE:
- wdt_service();
- ret = 0;
- break;
-
- case WDIOC_GETTIMEOUT:
- ret = put_user(heartbeat, (int *)arg);
- break;
- }
- return ret;
-}
-
-static int davinci_wdt_release(struct inode *inode, struct file *file)
-{
- wdt_service();
- clear_bit(WDT_IN_USE, &wdt_status);
-
- return 0;
-}
-
-static const struct file_operations davinci_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = davinci_wdt_write,
- .unlocked_ioctl = davinci_wdt_ioctl,
- .open = davinci_wdt_open,
- .release = davinci_wdt_release,
-};
-
-static struct miscdevice davinci_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &davinci_wdt_fops,
+static const struct watchdog_ops davinci_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = davinci_wdt_start,
+ .stop = davinci_wdt_ping,
+ .ping = davinci_wdt_ping,
};
static int davinci_wdt_probe(struct platform_device *pdev)
@@ -204,6 +121,7 @@ static int davinci_wdt_probe(struct platform_device *pdev)
int ret = 0;
struct device *dev = &pdev->dev;
struct resource *wdt_mem;
+ struct watchdog_device *wdd;
wdt_clk = devm_clk_get(dev, NULL);
if (WARN_ON(IS_ERR(wdt_clk)))
@@ -211,29 +129,34 @@ static int davinci_wdt_probe(struct platform_device *pdev)
clk_prepare_enable(wdt_clk);
- if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
- heartbeat = DEFAULT_HEARTBEAT;
+ wdd = &wdt_wdd;
+ wdd->info = &davinci_wdt_info;
+ wdd->ops = &davinci_wdt_ops;
+ wdd->min_timeout = 1;
+ wdd->max_timeout = MAX_HEARTBEAT;
+ wdd->timeout = DEFAULT_HEARTBEAT;
+
+ watchdog_init_timeout(wdd, heartbeat, dev);
+
+ dev_info(dev, "heartbeat %d sec\n", wdd->timeout);
- dev_info(dev, "heartbeat %d sec\n", heartbeat);
+ watchdog_set_nowayout(wdd, 1);
wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt_base = devm_ioremap_resource(dev, wdt_mem);
if (IS_ERR(wdt_base))
return PTR_ERR(wdt_base);
- ret = misc_register(&davinci_wdt_miscdev);
- if (ret < 0) {
- dev_err(dev, "cannot register misc device\n");
- } else {
- set_bit(WDT_DEVICE_INITED, &wdt_status);
- }
+ ret = watchdog_register_device(wdd);
+ if (ret < 0)
+ dev_err(dev, "cannot register watchdog device\n");
return ret;
}
static int davinci_wdt_remove(struct platform_device *pdev)
{
- misc_deregister(&davinci_wdt_miscdev);
+ watchdog_unregister_device(&wdt_wdd);
clk_disable_unprepare(wdt_clk);
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 23:40:21 +0000