Skip to content

L
linux-davinci
Commit c88e5dbf authored by Felipe Balbi's avatar Felipe Balbi Committed by Tony Lindgren
Browse files
Options

watchdog: cleanup a bit omap_wdt.c 

Trivial cleanup patch.
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 872de949
Show whitespace changes
Inline Side-by-side
Showing with 79 additions and 57 deletions
drivers/watchdog/omap_wdt.c
View file @ c88e5dbf
/*
* linux/drivers/watchdog/omap_wdt.c
* omap_wdt.c
*
* Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
*
......@@ -39,7 +39,6 @@
#include <linux/platform_device.h>
#include <linux/moduleparam.h>
#include <linux/clk.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/uaccess.h>
......@@ -71,11 +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();
......@@ -84,12 +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();
......@@ -97,12 +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();
......@@ -120,12 +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();
......@@ -134,13 +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;
......@@ -155,6 +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();
......@@ -163,13 +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.
*/
......@@ -188,14 +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);
......@@ -215,6 +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) {
......@@ -253,7 +259,6 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
default:
return -ENOTTY;
}
return 0;
}
static const struct file_operations omap_wdt_fops = {
......@@ -264,31 +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;
......@@ -297,7 +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;
}
}
......@@ -306,13 +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;
}
}
......@@ -321,19 +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);
......@@ -348,7 +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,
......@@ -361,28 +372,34 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
return 0;
fail:
if (wdev) {
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);
iounmap(wdev->base);
kfree(wdev);
}
if (mem) {
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);
......@@ -390,8 +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)
......@@ -400,14 +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;
......@@ -416,6 +435,7 @@ static int omap_wdt_remove(struct platform_device *pdev)
kfree(wdev);
omap_wdt_dev = NULL;
return 0;
}
......@@ -429,21 +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;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment