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Date: Mon, 10 Aug 2009 14:04:31 -0700
From: Kevin Hilman <khilman@...prootsystems.com>
To: Russell King - ARM Linux <linux@....linux.org.uk>
Cc: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
rt-users <linux-rt-users@...r.kernel.org>,
Wim Van Sebroeck <wim@...ana.be>,
linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH RT 8/6] [ARM, WATCHDOG] davinci: include mach/timex.h in davinci_wdt.c
Russell King - ARM Linux <linux@....linux.org.uk> writes:
> On Mon, Aug 10, 2009 at 09:48:07AM -0700, Kevin Hilman wrote:
>> diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
>> index 83e22e7..5ed89e4 100644
>> --- a/drivers/watchdog/davinci_wdt.c
>> +++ b/drivers/watchdog/davinci_wdt.c
>> @@ -25,6 +25,7 @@
>> #include <linux/uaccess.h>
>> #include <linux/io.h>
>> #include <linux/device.h>
>> +#include <linux/clk.h>
>>
>> #define MODULE_NAME "DAVINCI-WDT: "
>>
>> @@ -69,6 +70,7 @@ static unsigned long wdt_status;
>>
>> static struct resource *wdt_mem;
>> static void __iomem *wdt_base;
>> +struct clk *wdt_clk;
>
> Why the random spacing?
oops, not tabified.
>>
>> static void wdt_service(void)
>> {
>> @@ -86,6 +88,10 @@ static void wdt_enable(void)
>> {
>> u32 tgcr;
>> u32 timer_margin;
>> + u32 wdt_freq;
>> +
>> + BUG_ON(!wdt_clk);
>
> BUG_ON here is not required (and wrong).
removed.
>> + wdt_freq = clk_get_rate(wdt_clk);
>>
>> spin_lock(&io_lock);
>>
>> @@ -99,9 +105,9 @@ static void wdt_enable(void)
>> iowrite32(0, wdt_base + TIM12);
>> iowrite32(0, wdt_base + TIM34);
>> /* set timeout period */
>> - timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) & 0xffffffff);
>> + timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
>> iowrite32(timer_margin, wdt_base + PRD12);
>> - timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) >> 32);
>> + timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
>> iowrite32(timer_margin, wdt_base + PRD34);
>> /* enable run continuously */
>> iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
>> @@ -199,6 +205,11 @@ static int __devinit davinci_wdt_probe(struct platform_device *pdev)
>> struct resource *res;
>> struct device *dev = &pdev->dev;
>>
>> + wdt_clk = clk_get(dev, NULL);
>> + if (WARN_ON(!wdt_clk))
>> + return -ENODEV;
>
> if (WARN_ON(IS_ERR(wdt_clk)))
> return PTR_ERR(wdt_clk);
fixed.
>> + clk_enable(wdt_clk);
>> +
>> if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
>> heartbeat = DEFAULT_HEARTBEAT;
>>
>> @@ -245,6 +256,12 @@ static int __devexit davinci_wdt_remove(struct platform_device *pdev)
>> kfree(wdt_mem);
>> wdt_mem = NULL;
>> }
>> +
>> + if (wdt_clk) {
>
> NULL check is not required.
removed.
>> + clk_disable(wdt_clk);
>> + clk_put(wdt_clk);
>> + }
>> +
>> return 0;
>> }
>>
>> --
Updated version:
>From c7b99413b5323a5f7faa00e86d623b0711fcd0d0 Mon Sep 17 00:00:00 2001
From: Kevin Hilman <khilman@...prootsystems.com>
Date: Tue, 10 Feb 2009 20:30:37 -0800
Subject: [PATCH] watchdog: davinci: use clock framework for timer frequency
Remove use of CLOCK_TICK_RATE in favor of using clock framework
for getting timer frequency.
Signed-off-by: Kevin Hilman <khilman@...prootsystems.com>
---
drivers/watchdog/davinci_wdt.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 83e22e7..43c42f5 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -25,6 +25,7 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/device.h>
+#include <linux/clk.h>
#define MODULE_NAME "DAVINCI-WDT: "
@@ -69,6 +70,7 @@ static unsigned long wdt_status;
static struct resource *wdt_mem;
static void __iomem *wdt_base;
+struct clk *wdt_clk;
static void wdt_service(void)
{
@@ -86,6 +88,9 @@ static void wdt_enable(void)
{
u32 tgcr;
u32 timer_margin;
+ u32 wdt_freq;
+
+ wdt_freq = clk_get_rate(wdt_clk);
spin_lock(&io_lock);
@@ -99,9 +104,9 @@ static void wdt_enable(void)
iowrite32(0, wdt_base + TIM12);
iowrite32(0, wdt_base + TIM34);
/* set timeout period */
- timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) & 0xffffffff);
+ timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
iowrite32(timer_margin, wdt_base + PRD12);
- timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) >> 32);
+ timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
iowrite32(timer_margin, wdt_base + PRD34);
/* enable run continuously */
iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
@@ -199,6 +204,12 @@ static int __devinit davinci_wdt_probe(struct platform_device *pdev)
struct resource *res;
struct device *dev = &pdev->dev;
+ wdt_clk = clk_get(dev, NULL);
+ if (WARN_ON(IS_ERR(wdt_clk)))
+ return PTR_ERR(wdt_clk);
+
+ clk_enable(wdt_clk);
+
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
heartbeat = DEFAULT_HEARTBEAT;
@@ -245,6 +256,10 @@ static int __devexit davinci_wdt_remove(struct platform_device *pdev)
kfree(wdt_mem);
wdt_mem = NULL;
}
+
+ clk_disable(wdt_clk);
+ clk_put(wdt_clk);
+
return 0;
}
--
1.6.3.3
--
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