[U-Boot] [PATCH 4/4 V3] EXYNOS5: GPIO: Enable GPIO Command for EXYNOS5

[Minkyu Kang <mk7.kang@samsung.com>]

Dear Rajeshwari,

On 07/02/13 21:00, Rajeshwari Shinde wrote:
> This patch enables GPIO Command for EXYNOS5.
> Function has been added to asm/gpio.h to decode the
> input gpio name to gpio number.
> example: gpio set gpa00
> 
> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
> ---
> Changes in V2:
>         - New patch
> Changes in V3:
> 	- Created a table to know the base address of input bank.
>  arch/arm/cpu/armv7/exynos/pinmux.c      |   50 +++++++++++++++++++++++++++++++
>  arch/arm/include/asm/arch-exynos/gpio.h |    8 +++++
>  include/configs/exynos5250-dt.h         |    1 +
>  3 files changed, 59 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv7/exynos/pinmux.c b/arch/arm/cpu/armv7/exynos/pinmux.c
> index 28b0306..a01ce0c 100644
> --- a/arch/arm/cpu/armv7/exynos/pinmux.c
> +++ b/arch/arm/cpu/armv7/exynos/pinmux.c
> @@ -27,6 +27,21 @@
>  #include <asm/arch/pinmux.h>
>  #include <asm/arch/sromc.h>
>  
> +struct gpio_name_num_table exynos5_gpio_table[] = {
> +	{ 'a', GPIO_A00 },
> +	{ 'b', GPIO_B00 },
> +	{ 'c', GPIO_C00 },
> +	{ 'd', GPIO_D00 },
> +	{ 'y', GPIO_Y00 },
> +	{ 'x', GPIO_X00 },
> +	{ 'e', GPIO_E00 },
> +	{ 'f', GPIO_F00 },
> +	{ 'g', GPIO_G00 },
> +	{ 'h', GPIO_H00 },
> +	{ 'v', GPIO_V00 },
> +	{ 'z', GPIO_Z0 },
> +};
> +
>  static void exynos5_uart_config(int peripheral)
>  {
>  	int i, start, count;
> @@ -448,3 +463,38 @@ int pinmux_decode_periph_id(const void *blob, int node)
>  		return PERIPH_ID_NONE;
>  }
>  #endif
> +
> +int name_to_gpio(const char *name)

This function should be support exynos4 also.

> +{
> +	unsigned int num, i;
> +
> +	name++;

Please check NULL pointer before you use it.
And I think you should check length of name.
"name++" seems to dangerous.

How about parse the string to bank and number before you use?

> +
> +	if (*name == 'p')
> +		++name;

else?
is not error?

> +
> +	for (i = 0; i < ARRAY_SIZE(exynos5_gpio_table); i++) {
> +		if (*name == exynos5_gpio_table[i].bank) {
> +			if (*name == 'c') {
> +				name++;
> +				num = simple_strtoul(name, NULL, 10);
> +				if (num >= 40) {
> +					num = GPIO_C40 + (num - 40);
> +				} else {
> +					num = simple_strtoul(name, NULL, 8);
> +					num = exynos5_gpio_table[i].base + num;
> +				}
> +			} else {
> +				name++;
> +				num = simple_strtoul(name, NULL, 8);
> +				num = exynos5_gpio_table[i].base + num;
> +			}
> +			break;

			return num;

> +		}
> +	}

	return -1;

> +
> +	if (i == ARRAY_SIZE(exynos5_gpio_table))
> +		return -1;
> +	
> +	return num;
> +}
> diff --git a/arch/arm/include/asm/arch-exynos/gpio.h b/arch/arm/include/asm/arch-exynos/gpio.h
> index 38b959d..016a112 100644
> --- a/arch/arm/include/asm/arch-exynos/gpio.h
> +++ b/arch/arm/include/asm/arch-exynos/gpio.h
> @@ -657,6 +657,14 @@ static inline unsigned int s5p_gpio_part_max(int nr)
>  void gpio_cfg_pin(int gpio, int cfg);
>  void gpio_set_pull(int gpio, int mode);
>  void gpio_set_drv(int gpio, int mode);
> +
> +struct gpio_name_num_table {
> +	char bank;
> +	unsigned int base;
> +};
> +
> +int name_to_gpio(const char *name);
> +#define name_to_gpio(n) name_to_gpio(n)
>  #endif
>  
>  /* Pin configurations */
> diff --git a/include/configs/exynos5250-dt.h b/include/configs/exynos5250-dt.h
> index b1b24a9..a32cc3e 100644
> --- a/include/configs/exynos5250-dt.h
> +++ b/include/configs/exynos5250-dt.h
> @@ -113,6 +113,7 @@
>  #define CONFIG_CMD_EXT2
>  #define CONFIG_CMD_FAT
>  #define CONFIG_CMD_NET
> +#define CONFIG_CMD_GPIO
>  
>  #define CONFIG_BOOTDELAY		3
>  #define CONFIG_ZERO_BOOTDELAY_CHECK
> 

Thanks.
Minkyu Kang.