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path: root/drivers/watchdog
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Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/omap_wdt.c132
1 files changed, 78 insertions, 54 deletions
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 9c389b16497f..7bcbb7f4745f 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -70,11 +70,14 @@ struct omap_wdt_dev {
static void omap_wdt_ping(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
+
/* wait for posted write to complete */
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
+
wdt_trgr_pattern = ~wdt_trgr_pattern;
__raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
+
/* wait for posted write to complete */
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
cpu_relax();
@@ -83,12 +86,13 @@ static void omap_wdt_ping(struct omap_wdt_dev *wdev)
static void omap_wdt_enable(struct omap_wdt_dev *wdev)
{
- void __iomem *base;
- base = wdev->base;
+ void __iomem *base = wdev->base;
+
/* Sequence to enable the watchdog */
__raw_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
+
__raw_writel(0x4444, base + OMAP_WATCHDOG_SPR);
while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
cpu_relax();
@@ -96,12 +100,13 @@ static void omap_wdt_enable(struct omap_wdt_dev *wdev)
static void omap_wdt_disable(struct omap_wdt_dev *wdev)
{
- void __iomem *base;
- base = wdev->base;
+ void __iomem *base = wdev->base;
+
/* sequence required to disable watchdog */
__raw_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
+
__raw_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
cpu_relax();
@@ -119,12 +124,12 @@ static void omap_wdt_adjust_timeout(unsigned new_timeout)
static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
{
u32 pre_margin = GET_WLDR_VAL(timer_margin);
- void __iomem *base;
- base = wdev->base;
+ void __iomem *base = wdev->base;
/* just count up at 32 KHz */
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
+
__raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
cpu_relax();
@@ -133,13 +138,11 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
/*
* Allow only one task to hold it open
*/
-
static int omap_wdt_open(struct inode *inode, struct file *file)
{
- struct omap_wdt_dev *wdev;
- void __iomem *base;
- wdev = platform_get_drvdata(omap_wdt_dev);
- base = wdev->base;
+ struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
+ void __iomem *base = wdev->base;
+
if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
return -EBUSY;
@@ -154,6 +157,7 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
/* initialize prescaler */
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
+
__raw_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
@@ -162,13 +166,14 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
+
return nonseekable_open(inode, file);
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
- struct omap_wdt_dev *wdev;
- wdev = file->private_data;
+ struct omap_wdt_dev *wdev = file->private_data;
+
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
@@ -187,14 +192,15 @@ static int omap_wdt_release(struct inode *inode, struct file *file)
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
wdev->omap_wdt_users = 0;
+
return 0;
}
static ssize_t omap_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
- struct omap_wdt_dev *wdev;
- wdev = file->private_data;
+ struct omap_wdt_dev *wdev = file->private_data;
+
/* Refresh LOAD_TIME. */
if (len) {
spin_lock(&wdt_lock);
@@ -214,6 +220,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
+
wdev = file->private_data;
switch (cmd) {
@@ -262,31 +269,37 @@ static const struct file_operations omap_wdt_fops = {
.release = omap_wdt_release,
};
-
static int __init omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
- int ret;
struct omap_wdt_dev *wdev;
+ int ret;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENOENT;
+ if (!res) {
+ ret = -ENOENT;
+ goto err_get_resource;
+ }
- if (omap_wdt_dev)
- return -EBUSY;
+ if (omap_wdt_dev) {
+ ret = -EBUSY;
+ goto err_busy;
+ }
mem = request_mem_region(res->start, res->end - res->start + 1,
pdev->name);
- if (mem == NULL)
- return -EBUSY;
+ if (!mem) {
+ ret = -EBUSY;
+ goto err_busy;
+ }
wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
if (!wdev) {
ret = -ENOMEM;
- goto fail;
+ goto err_kzalloc;
}
+
wdev->omap_wdt_users = 0;
wdev->mem = mem;
@@ -295,7 +308,7 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
if (IS_ERR(wdev->armwdt_ck)) {
ret = PTR_ERR(wdev->armwdt_ck);
wdev->armwdt_ck = NULL;
- goto fail;
+ goto err_clk;
}
}
@@ -304,13 +317,13 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
if (IS_ERR(wdev->mpu_wdt_ick)) {
ret = PTR_ERR(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
- goto fail;
+ goto err_clk;
}
wdev->mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
if (IS_ERR(wdev->mpu_wdt_fck)) {
ret = PTR_ERR(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
- goto fail;
+ goto err_clk;
}
}
@@ -319,19 +332,19 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
if (IS_ERR(wdev->mpu_wdt_ick)) {
ret = PTR_ERR(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
- goto fail;
+ goto err_clk;
}
wdev->mpu_wdt_fck = clk_get(&pdev->dev, "wdt2_fck");
if (IS_ERR(wdev->mpu_wdt_fck)) {
ret = PTR_ERR(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
- goto fail;
+ goto err_clk;
}
}
wdev->base = ioremap(res->start, res->end - res->start + 1);
if (!wdev->base) {
ret = -ENOMEM;
- goto fail;
+ goto err_ioremap;
}
platform_set_drvdata(pdev, wdev);
@@ -346,7 +359,7 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
ret = misc_register(&(wdev->omap_wdt_miscdev));
if (ret)
- goto fail;
+ goto err_misc;
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
@@ -359,28 +372,34 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
return 0;
-fail:
- if (wdev) {
- platform_set_drvdata(pdev, NULL);
- if (wdev->armwdt_ck)
- clk_put(wdev->armwdt_ck);
- if (wdev->mpu_wdt_ick)
- clk_put(wdev->mpu_wdt_ick);
- if (wdev->mpu_wdt_fck)
- clk_put(wdev->mpu_wdt_fck);
- iounmap(wdev->base);
- kfree(wdev);
- }
- if (mem) {
- release_mem_region(res->start, res->end - res->start + 1);
- }
+err_misc:
+ platform_set_drvdata(pdev, NULL);
+ iounmap(wdev->base);
+
+err_ioremap:
+ wdev->base = NULL;
+
+err_clk:
+ if (wdev->armwdt_ck)
+ clk_put(wdev->armwdt_ck);
+ if (wdev->mpu_wdt_ick)
+ clk_put(wdev->mpu_wdt_ick);
+ if (wdev->mpu_wdt_fck)
+ clk_put(wdev->mpu_wdt_fck);
+ kfree(wdev);
+
+err_kzalloc:
+ release_mem_region(res->start, res->end - res->start + 1);
+
+err_busy:
+err_get_resource:
+
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
+ struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users)
omap_wdt_disable(wdev);
@@ -388,8 +407,7 @@ static void omap_wdt_shutdown(struct platform_device *pdev)
static int omap_wdt_remove(struct platform_device *pdev)
{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
+ struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@@ -398,14 +416,17 @@ static int omap_wdt_remove(struct platform_device *pdev)
misc_deregister(&(wdev->omap_wdt_miscdev));
release_mem_region(res->start, res->end - res->start + 1);
platform_set_drvdata(pdev, NULL);
+
if (wdev->armwdt_ck) {
clk_put(wdev->armwdt_ck);
wdev->armwdt_ck = NULL;
}
+
if (wdev->mpu_wdt_ick) {
clk_put(wdev->mpu_wdt_ick);
wdev->mpu_wdt_ick = NULL;
}
+
if (wdev->mpu_wdt_fck) {
clk_put(wdev->mpu_wdt_fck);
wdev->mpu_wdt_fck = NULL;
@@ -414,6 +435,7 @@ static int omap_wdt_remove(struct platform_device *pdev)
kfree(wdev);
omap_wdt_dev = NULL;
+
return 0;
}
@@ -427,21 +449,23 @@ static int omap_wdt_remove(struct platform_device *pdev)
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
+ struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+
if (wdev->omap_wdt_users)
omap_wdt_disable(wdev);
+
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
+ struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+
if (wdev->omap_wdt_users) {
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
}
+
return 0;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-27 07:45:40 +0300