linux-kernel - Re: [PATCH 1/7] MFD: ASIC3: add API for EXTCF and SDHWCTRL register manipulation

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Date:	Fri, 5 Jun 2009 01:46:26 +0200
From:	Samuel Ortiz <sameo@...nedhand.com>
To:	Philipp Zabel <philipp.zabel@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] MFD: ASIC3: add API for EXTCF and SDHWCTRL
	register manipulation

Hi Philipp

On Thu, Jun 04, 2009 at 08:36:10PM +0200, Philipp Zabel wrote:
> Those registers are needed for PCMCIA and MMC/SDIO operation as
> well as for the DS1WM.
> 
> Signed-off-by: Philipp Zabel <philipp.zabel@...il.com>
> ---
>  drivers/mfd/asic3.c       |   48 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/asic3.h |   13 +++++++----
>  2 files changed, 56 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
> index 9e48545..8e1653a 100644
> --- a/drivers/mfd/asic3.c
> +++ b/drivers/mfd/asic3.c
> @@ -52,6 +52,54 @@ static inline u32 asic3_read_register(struct asic3 *asic,
>  			(reg >> asic->bus_shift));
>  }
>  
> +void asic3_set_extcf_select(struct device *dev, u32 bits, int value)
2 remarks here:
- The "value" parameter could be a bool, and could use a better name, e.g.
"set".
- Those 3 routines are basically doing the same thing. Why not having a
generic:
void asic3_set_register(struct device *dev, u32 reg, u32 bits, bool set) ?

Cheers,
Samuel.

> +{
> +	struct asic3 *asic = dev->driver_data;
> +	unsigned long flags;
> +	u32 v;
> +
> +	spin_lock_irqsave(&asic->lock, flags);
> +	v = asic3_read_register(asic, ASIC3_OFFSET(EXTCF, SELECT));
> +	if (value)
> +		v |= bits;
> +	else
> +		v &= ~bits;
> +	asic3_write_register(asic, ASIC3_OFFSET(EXTCF, SELECT), v);
> +	spin_unlock_irqrestore(&asic->lock, flags);
> +}
> +EXPORT_SYMBOL(asic3_set_extcf_select);
> +
> +void asic3_set_extcf_reset(struct device *dev, u32 bits, int value)
> +{
> +	struct asic3 *asic = dev->driver_data;
> +	unsigned long flags;
> +	u32 v;
> +
> +	spin_lock_irqsave(&asic->lock, flags);
> +	v = asic3_read_register(asic, ASIC3_OFFSET(EXTCF, RESET));
> +	if (value)
> +		v |= bits;
> +	else
> +		v &= ~bits;
> +	asic3_write_register(asic, ASIC3_OFFSET(EXTCF, RESET), v);
> +	spin_unlock_irqrestore(&asic->lock, flags);
> +}
> +
> +void asic3_set_sdhwctrl(struct asic3 *asic, u32 bits, int value)
> +{
> +	unsigned long flags;
> +	u32 v;
> +
> +	spin_lock_irqsave(&asic->lock, flags);
> +	v = asic3_read_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF));
> +	if (value)
> +		v |= bits;
> +	else
> +		v &= ~bits;
> +	asic3_write_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF), v);
> +	spin_unlock_irqrestore(&asic->lock, flags);
> +}
> +
>  /* IRQs */
>  #define MAX_ASIC_ISR_LOOPS    20
>  #define ASIC3_GPIO_BASE_INCR \
> diff --git a/include/linux/mfd/asic3.h b/include/linux/mfd/asic3.h
> index 322cd6d..cd02d20 100644
> --- a/include/linux/mfd/asic3.h
> +++ b/include/linux/mfd/asic3.h
> @@ -16,6 +16,9 @@
>  
>  #include <linux/types.h>
>  
> +/* for PCMCIA */
> +extern void asic3_set_extcf_select(struct device *dev, u32 bits, int value);
> +
>  struct asic3_platform_data {
>  	u16 *gpio_config;
>  	unsigned int gpio_config_num;
> @@ -227,8 +230,8 @@ struct asic3_platform_data {
>  
>  
>  /* Basic control of the SD ASIC */
> -#define ASIC3_SDHWCTRL_Base	0x0E00
> -#define ASIC3_SDHWCTRL_SDConf    0x00
> +#define ASIC3_SDHWCTRL_BASE     0x0E00
> +#define ASIC3_SDHWCTRL_SDCONF     0x00
>  
>  #define ASIC3_SDHWCTRL_SUSPEND    (1 << 0)  /* 1=suspend all SD operations */
>  #define ASIC3_SDHWCTRL_CLKSEL     (1 << 1)  /* 1=SDICK, 0=HCLK */
> @@ -242,10 +245,10 @@ struct asic3_platform_data {
>  /* SD card power supply ctrl 1=enable */
>  #define ASIC3_SDHWCTRL_SDPWR      (1 << 6)
>  
> -#define ASIC3_EXTCF_Base		0x1100
> +#define ASIC3_EXTCF_BASE        0x1100
>  
> -#define ASIC3_EXTCF_Select         0x00
> -#define ASIC3_EXTCF_Reset          0x04
> +#define ASIC3_EXTCF_SELECT        0x00
> +#define ASIC3_EXTCF_RESET         0x04
>  
>  #define ASIC3_EXTCF_SMOD0	         (1 << 0)  /* slot number of mode 0 */
>  #define ASIC3_EXTCF_SMOD1	         (1 << 1)  /* slot number of mode 1 */
> -- 
> 1.6.3.1
> 

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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