linux-kernel - Re: [PATCH] gpio: langwell: ensure alternate function is cleared

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Date:	Wed, 05 Oct 2011 10:52:07 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH] gpio: langwell: ensure alternate function is cleared

On 04/10/11 21:37, Grant Likely wrote:
> On Mon, Oct 03, 2011 at 02:36:07PM +0300, Adrian Hunter wrote:
>> Alternate function must be zero for the pin to act as
>> a GPIO.
>>
>> Signed-off-by: Adrian Hunter<adrian.hunter@...el.com>
>> Signed-off-by: Alan Cox<alan@...ux.intel.com>
>> ---
>>   drivers/gpio/gpio-langwell.c |   27 +++++++++++++++++++++++++++
>>   1 files changed, 27 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
>> index d2eb57c..00692e8 100644
>> --- a/drivers/gpio/gpio-langwell.c
>> +++ b/drivers/gpio/gpio-langwell.c
>> @@ -59,6 +59,7 @@ enum GPIO_REG {
>>   	GRER,		/* rising edge detect */
>>   	GFER,		/* falling edge detect */
>>   	GEDR,		/* edge detect result */
>> +	GAFR,		/* alt function */
>>   };
>>
>>   struct lnw_gpio {
>> @@ -81,6 +82,31 @@ static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
>>   	return ptr;
>>   }
>>
>> +static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset,
>> +				   enum GPIO_REG reg_type)
>> +{
>> +	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
>> +	unsigned nreg = chip->ngpio / 32;
>> +	u8 reg = offset / 16;
>> +	void __iomem *ptr;
>> +
>> +	ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4);
>
> This looks wrong.  It looks to me like the __iomem annotation should
> be added to ->reg_base.
>
> Otherwise, the patch looks okay.
>

Deserves a separate patch...

From: Adrian Hunter <adrian.hunter@...el.com>
Date: Wed, 5 Oct 2011 10:29:27 +0300
Subject: [PATCH] gpio: langwell: declare reg_base as __iomem

reg_base is __iomem so add that to the declaration
and fix up assignment casts and types.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
  drivers/gpio/gpio-langwell.c |   12 ++++++------
  1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index 00692e8..b7465e5 100644
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -64,7 +64,7 @@ enum GPIO_REG {

  struct lnw_gpio {
  	struct gpio_chip		chip;
-	void				*reg_base;
+	void __iomem			*reg_base;
  	spinlock_t			lock;
  	unsigned			irq_base;
  	struct pci_dev			*pdev;
@@ -78,7 +78,7 @@ static void __iomem *gpio_reg(struct gpio_chip *chip, 
unsigned offset,
  	u8 reg = offset / 32;
  	void __iomem *ptr;

-	ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4);
+	ptr = lnw->reg_base + reg_type * nreg * 4 + reg * 4;
  	return ptr;
  }

@@ -90,7 +90,7 @@ static void __iomem *gpio_reg_2bit(struct gpio_chip 
*chip, unsigned offset,
  	u8 reg = offset / 16;
  	void __iomem *ptr;

-	ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4);
+	ptr = lnw->reg_base + reg_type * nreg * 4 + reg * 4;
  	return ptr;
  }

@@ -299,7 +299,7 @@ static const struct dev_pm_ops lnw_gpio_pm_ops = {
  static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
  			const struct pci_device_id *id)
  {
-	void *base;
+	void __iomem *base;
  	int i;
  	resource_size_t start, len;
  	struct lnw_gpio *lnw;
@@ -324,8 +324,8 @@ static int __devinit lnw_gpio_probe(struct pci_dev 
*pdev,
  		dev_err(&pdev->dev, "error mapping bar1\n");
  		goto err3;
  	}
-	irq_base = *(u32 *)base;
-	gpio_base = *((u32 *)base + 1);
+	irq_base = *(__force u32 *)base;
+	gpio_base = *((__force u32 *)base + 1);
  	/* release the IO mapping, since we already get the info from bar1 */
  	iounmap(base);
  	/* get the register base from bar0 */
-- 
1.7.6

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