[U-Boot] [PATCH V3 3/5] I2C: add i2c support for Pantheon platform

[Prafulla Wadaskar]

> -----Original Message-----
> From: Lei Wen [mailto:leiwen at marvell.com]
> Sent: Thursday, March 17, 2011 12:15 PM
> To: Heiko Schocher; Wolfgang Denk; Prafulla Wadaskar; u-
> boot at lists.denx.de; Marek Vasut; Ashish Karkare; Prabhanjan Sarnaik;
> adrian.wenl at gmail.com
> Subject: [PATCH V3 3/5] I2C: add i2c support for Pantheon platform
> 
> Add i2c support to dkb board with pantheon soc.
> 
> Signed-off-by: Lei Wen <leiwen at marvell.com>
> ---
> Changelog:
> V3:
> clean code sytle issue
> Add i2c clock enable code include in I2C configure define block
> 
>  arch/arm/cpu/arm926ejs/pantheon/cpu.c    |   12 ++++++++++++
>  arch/arm/include/asm/arch-pantheon/cpu.h |    4 +++-
>  arch/arm/include/asm/arch-pantheon/mfp.h |    6 ++++--
>  board/Marvell/dkb/dkb.c                  |    4 ++++
>  include/configs/dkb.h                    |   11 +++++++++++
>  5 files changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/cpu/arm926ejs/pantheon/cpu.c
> b/arch/arm/cpu/arm926ejs/pantheon/cpu.c
> index 9ddc77c..8b2eafa 100644
> --- a/arch/arm/cpu/arm926ejs/pantheon/cpu.c
> +++ b/arch/arm/cpu/arm926ejs/pantheon/cpu.c
> @@ -59,6 +59,12 @@ int arch_cpu_init(void)
>  	/* Enable GPIO clock */
>  	writel(APBC_APBCLK, &apbclkres->gpio);
> 
> +#ifdef CONFIG_I2C_MV
> +	/* Enable I2C clock */
> +	writel(APBC_RST | APBC_FNCLK | APBC_APBCLK, &apbclkres->twsi);
> +	writel(APBC_FNCLK | APBC_APBCLK, &apbclkres->twsi);
> +#endif
> +
>  	icache_enable();
> 
>  	return 0;
> @@ -76,3 +82,9 @@ int print_cpuinfo(void)
>  	return 0;
>  }
>  #endif
> +
> +#ifdef CONFIG_I2C_MV
> +void i2c_clk_enable(void)
> +{
> +}

Empty function !!

> +#endif
> diff --git a/arch/arm/include/asm/arch-pantheon/cpu.h
> b/arch/arm/include/asm/arch-pantheon/cpu.h
> index 30f4393..60955c5 100644
> --- a/arch/arm/include/asm/arch-pantheon/cpu.h
> +++ b/arch/arm/include/asm/arch-pantheon/cpu.h
> @@ -50,7 +50,9 @@ struct panthapb_registers {
>  	u32 uart0;	/*0x000*/
>  	u32 uart1;	/*0x004*/
>  	u32 gpio;	/*0x008*/
> -	u8 pad0[0x034 - 0x08 - 4];
> +	u8 pad0[0x02c - 0x08 - 4];
> +	u32 twsi;	/*0x02c*/
> +	u8 pad1[0x034 - 0x2c - 4];
>  	u32 timers;	/*0x034*/
>  };
> 
> diff --git a/arch/arm/include/asm/arch-pantheon/mfp.h
> b/arch/arm/include/asm/arch-pantheon/mfp.h
> index fb291cf..e939196 100644
> --- a/arch/arm/include/asm/arch-pantheon/mfp.h
> +++ b/arch/arm/include/asm/arch-pantheon/mfp.h
> @@ -32,8 +32,10 @@
>   * offset, pull,pF, drv,dF, edge,eF ,afn,aF
>   */
>  /* UART2 */
> -#define MFP47_UART2_RXD		MFP_REG(0x198) | MFP_AF6 |
> MFP_DRIVE_MEDIUM
> -#define MFP48_UART2_TXD		MFP_REG(0x19c) | MFP_AF6 |
> MFP_DRIVE_MEDIUM
> +#define MFP47_UART2_RXD		(MFP_REG(0x198) | MFP_AF6 |
> MFP_DRIVE_MEDIUM)
> +#define MFP48_UART2_TXD		(MFP_REG(0x19c) | MFP_AF6 |
> MFP_DRIVE_MEDIUM)
> +#define MFP53_CI2C_SCL		(MFP_REG(0x1b0) | MFP_AF2 |
> MFP_DRIVE_MEDIUM)
> +#define MFP54_CI2C_SDA		(MFP_REG(0x1b4) | MFP_AF2 |
> MFP_DRIVE_MEDIUM)
> 
>  /* More macros can be defined here... */
> 
> diff --git a/board/Marvell/dkb/dkb.c b/board/Marvell/dkb/dkb.c
> index 72a2d2a..00f73e7 100644
> --- a/board/Marvell/dkb/dkb.c
> +++ b/board/Marvell/dkb/dkb.c
> @@ -36,6 +36,10 @@ int board_early_init_f(void)
>  		MFP47_UART2_RXD,
>  		MFP48_UART2_TXD,
> 
> +		/* I2C */
> +		MFP53_CI2C_SCL,
> +		MFP54_CI2C_SDA,
> +
>  		MFP_EOC		/*End of configureation*/
>  	};
>  	/* configure MFP's */
> diff --git a/include/configs/dkb.h b/include/configs/dkb.h
> index 638af5e..1b18c44 100644
> --- a/include/configs/dkb.h
> +++ b/include/configs/dkb.h
> @@ -56,6 +56,17 @@
>  #include "mv-common.h"
> 
>  #undef CONFIG_ARCH_MISC_INIT
> +
> +/*
> + * I2C definition
> + */
> +#define CONFIG_CMD_I2C
> +#define CONFIG_I2C_MV			1
> +#define CONFIG_PXA_I2C_REG		0xd4011000
> +#define CONFIG_HARD_I2C			1
> +#define CONFIG_SYS_I2C_SPEED		0
> +#define CONFIG_SYS_I2C_SLAVE		0xfe
> +
What about if I don't want to include this support
These configuration must if ifdefed with CONFIG_CMD_I2C which will be defined in board config file.

Regards..
Prafulla . .