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Date: Tue, 10 Mar 2009 18:03:54 +0200
From: Atal Shargorodsky <ext-atal.shargorodsky@...ia.com>
To: linux-kernel@...r.kernel.org
Cc: linux@....linux.org.uk,
Atal Shargorodsky <ext-atal.shargorodsky@...ia.com>
Subject: [PATCH 4/6] Proper interface clock management.
Enable interface clock only when accesssing the hw.
Signed-off-by: Atal Shargorodsky <ext-atal.shargorodsky@...ia.com>
---
drivers/watchdog/omap_wdt.c | 47 +++++++++++++++++++++++++++++++-----------
1 files changed, 34 insertions(+), 13 deletions(-)
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 1364d7e..d033139 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -83,6 +83,16 @@ static void omap_wdt_ping(struct omap_wdt_dev *wdev)
/* reloaded WCRR from WLDR */
}
+static void omap_wdt_ick_enable(struct clk *ick, int enable)
+{
+ if (ick) {
+ if (enable)
+ clk_enable(ick);
+ else
+ clk_disable(ick);
+ }
+}
+
static void omap_wdt_enable(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
@@ -145,9 +155,7 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
return -EBUSY;
- if (wdev->mpu_wdt_ick)
- clk_enable(wdev->mpu_wdt_ick);
-
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
clk_enable(wdev->mpu_wdt_fck);
/* initialize prescaler */
@@ -162,6 +170,7 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
return nonseekable_open(inode, file);
}
@@ -175,10 +184,9 @@ static int omap_wdt_release(struct inode *inode, struct file *file)
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_disable(wdev);
-
- if (wdev->mpu_wdt_ick)
- clk_disable(wdev->mpu_wdt_ick);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
clk_disable(wdev->mpu_wdt_fck);
#else
@@ -196,9 +204,11 @@ static ssize_t omap_wdt_write(struct file *file, const char __user *data,
/* Refresh LOAD_TIME. */
if (len) {
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
}
return len;
}
@@ -230,15 +240,18 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
return put_user(omap_prcm_get_reset_sources(),
(int __user *)arg);
case WDIOC_KEEPALIVE:
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
spin_lock(&wdt_lock);
omap_wdt_disable(wdev);
omap_wdt_set_timeout(wdev);
@@ -246,6 +259,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timer_margin, (int __user *)arg);
@@ -344,9 +358,7 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, wdev);
/* enable clocks for register access */
- if (wdev->mpu_wdt_ick)
- clk_enable(wdev->mpu_wdt_ick);
-
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
clk_enable(wdev->mpu_wdt_fck);
omap_wdt_disable(wdev);
@@ -369,8 +381,7 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
__raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
/* disable clocks since we don't need them now */
- if (wdev->mpu_wdt_ick)
- clk_disable(wdev->mpu_wdt_ick);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
clk_disable(wdev->mpu_wdt_fck);
omap_wdt_dev = pdev;
@@ -378,6 +389,8 @@ static int __init omap_wdt_probe(struct platform_device *pdev)
return 0;
err_misc:
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+ clk_disable(wdev->mpu_wdt_fck);
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
@@ -404,8 +417,11 @@ static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
- if (wdev->omap_wdt_users)
+ if (wdev->omap_wdt_users) {
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_disable(wdev);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+ }
}
static int omap_wdt_remove(struct platform_device *pdev)
@@ -449,8 +465,11 @@ static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
- if (wdev->omap_wdt_users)
+ if (wdev->omap_wdt_users) {
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_disable(wdev);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
+ }
return 0;
}
@@ -460,8 +479,10 @@ static int omap_wdt_resume(struct platform_device *pdev)
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
+ omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0);
}
return 0;
--
1.5.4.3
--
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