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authorRussell King <rmk+kernel@arm.linux.org.uk>2009-11-20 13:04:14 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-12 17:32:37 +0000
commit24fd1edaac79fe9554c557f9f93b3197c136c236 (patch)
treec4832abaf020d7f75745e9c401f3df64ead87474 /drivers/watchdog/pnx4008_wdt.c
parent9bb787f435c86ffed079b66efa3ef6a8c577568c (diff)
downloadvexpress-lsk-24fd1edaac79fe9554c557f9f93b3197c136c236.tar.gz
ARM: PNX4008: convert watchdog to use clk API enable/disable calls
clk_set_rate() is not supposed to be used to turn clocks on and off. That's what clk_enable/clk_disable is for. Acked-by: Wim Van Sebroeck <wim@iguana.be> Acked-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/watchdog/pnx4008_wdt.c')
-rw-r--r--drivers/watchdog/pnx4008_wdt.c37
1 files changed, 24 insertions, 13 deletions
diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c
index 8c5367fc4e5..c7a9479934a 100644
--- a/drivers/watchdog/pnx4008_wdt.c
+++ b/drivers/watchdog/pnx4008_wdt.c
@@ -96,9 +96,6 @@ static void wdt_enable(void)
{
spin_lock(&io_lock);
- if (wdt_clk)
- clk_set_rate(wdt_clk, 1);
-
/* stop counter, initiate counter reset */
__raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
/*wait for reset to complete. 100% guarantee event */
@@ -125,19 +122,25 @@ static void wdt_disable(void)
spin_lock(&io_lock);
__raw_writel(0, WDTIM_CTRL(wdt_base)); /*stop counter */
- if (wdt_clk)
- clk_set_rate(wdt_clk, 0);
spin_unlock(&io_lock);
}
static int pnx4008_wdt_open(struct inode *inode, struct file *file)
{
+ int ret;
+
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
return -EBUSY;
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+ ret = clk_enable(wdt_clk);
+ if (ret) {
+ clear_bit(WDT_IN_USE, &wdt_status);
+ return ret;
+ }
+
wdt_enable();
return nonseekable_open(inode, file);
@@ -225,6 +228,7 @@ static int pnx4008_wdt_release(struct inode *inode, struct file *file)
printk(KERN_WARNING "WATCHDOG: Device closed unexpectdly\n");
wdt_disable();
+ clk_disable(wdt_clk);
clear_bit(WDT_IN_USE, &wdt_status);
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
@@ -279,19 +283,27 @@ static int __devinit pnx4008_wdt_probe(struct platform_device *pdev)
release_resource(wdt_mem);
kfree(wdt_mem);
goto out;
- } else
- clk_set_rate(wdt_clk, 1);
+ }
+
+ ret = clk_enable(wdt_clk);
+ if (ret) {
+ release_resource(wdt_mem);
+ kfree(wdt_mem);
+ goto out;
+ }
ret = misc_register(&pnx4008_wdt_miscdev);
if (ret < 0) {
printk(KERN_ERR MODULE_NAME "cannot register misc device\n");
release_resource(wdt_mem);
kfree(wdt_mem);
- clk_set_rate(wdt_clk, 0);
+ clk_disable(wdt_clk);
+ clk_put(wdt_clk);
} else {
boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
WDIOF_CARDRESET : 0;
wdt_disable(); /*disable for now */
+ clk_disable(wdt_clk);
set_bit(WDT_DEVICE_INITED, &wdt_status);
}
@@ -302,11 +314,10 @@ out:
static int __devexit pnx4008_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&pnx4008_wdt_miscdev);
- if (wdt_clk) {
- clk_set_rate(wdt_clk, 0);
- clk_put(wdt_clk);
- wdt_clk = NULL;
- }
+
+ clk_disable(wdt_clk);
+ clk_put(wdt_clk);
+
if (wdt_mem) {
release_resource(wdt_mem);
kfree(wdt_mem);