[U-Boot] [PATCH 3/3] mx28evk: add SPI support

[Marek Vasut <marek.vasut@gmail.com>]

> This patch adds SPI support for the MX28EVK. Support for
> an optionally installed SPI flash is also added. An example
> configuration for redundant envrionment from SPI flash is also
> added but disabled by default.
> 
> This patch has been tested on a MX28EVK Rev. D with an installed
> SST25VF032B 32Mbit SPI flash.
> 
> Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
> ---
>  board/freescale/mx28evk/iomux.c |    8 +++++++
>  include/configs/mx28evk.h       |   44
> ++++++++++++++++++++++++++++++++++++-- 2 files changed, 49 insertions(+),
> 3 deletions(-)
> 
> diff --git a/board/freescale/mx28evk/iomux.c
> b/board/freescale/mx28evk/iomux.c index 904e3f3..396761b 100644
> --- a/board/freescale/mx28evk/iomux.c
> +++ b/board/freescale/mx28evk/iomux.c
> @@ -28,6 +28,7 @@
>  #define	MUX_CONFIG_SSP0	(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP)
>  #define	MUX_CONFIG_ENET	(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP)
>  #define	MUX_CONFIG_EMI	(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL)
> +#define	MUX_CONFIG_SSP2	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_PULLUP)
> 
>  const iomux_cfg_t iomux_setup[] = {
>  	/* DUART */
> @@ -130,6 +131,13 @@ const iomux_cfg_t iomux_setup[] = {
>  	MX28_PAD_EMI_CE0N__EMI_CE0N | MUX_CONFIG_EMI,
>  	MX28_PAD_EMI_CE1N__EMI_CE1N | MUX_CONFIG_EMI,
>  	MX28_PAD_EMI_CKE__EMI_CKE | MUX_CONFIG_EMI,
> +
> +	/* SPI2 (for SPI flash) */
> +	MX28_PAD_SSP2_SCK__SSP2_SCK | MUX_CONFIG_SSP2,
> +	MX28_PAD_SSP2_MOSI__SSP2_CMD | MUX_CONFIG_SSP2,
> +	MX28_PAD_SSP2_MISO__SSP2_D0 | MUX_CONFIG_SSP2,
> +	MX28_PAD_SSP2_SS0__SSP2_D3 |
> +		(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP),
>  };
> 
>  void board_init_ll(void)
> diff --git a/include/configs/mx28evk.h b/include/configs/mx28evk.h
> index 8f791aa..04967d7 100644
> --- a/include/configs/mx28evk.h
> +++ b/include/configs/mx28evk.h
> @@ -64,6 +64,8 @@
>  #define CONFIG_CMD_NET
>  #define CONFIG_CMD_NFS
>  #define CONFIG_CMD_PING
> +#define CONFIG_CMD_SF
> +#define CONFIG_CMD_SPI
>  #define CONFIG_CMD_USB
> 
>  /*
> @@ -127,9 +129,11 @@
>   * MMC Driver
>   */
>  #define CONFIG_ENV_IS_IN_MMC
> -#define CONFIG_ENV_OFFSET	(256 * 1024)
> -#define CONFIG_ENV_SIZE	(16 * 1024)
> -#define CONFIG_SYS_MMC_ENV_DEV 0
> +#ifdef CONFIG_ENV_IS_IN_MMC
> + #define CONFIG_ENV_OFFSET	(256 * 1024)
> + #define CONFIG_ENV_SIZE	(16 * 1024)
> + #define CONFIG_SYS_MMC_ENV_DEV 0
> +#endif
>  #define CONFIG_CMD_SAVEENV
>  #ifdef	CONFIG_CMD_MMC
>  #define CONFIG_MMC
> @@ -170,6 +174,40 @@
>  #endif
> 
>  /*
> + * SPI
> + */
> +#ifdef CONFIG_CMD_SPI
> +#define CONFIG_HARD_SPI
> +#define CONFIG_MXS_SPI
> +#define CONFIG_SPI_HALF_DUPLEX
> +#define CONFIG_DEFAULT_SPI_BUS		2
> +#define CONFIG_DEFAULT_SPI_MODE		SPI_MODE_0
> +
> +/* SPI Flash */
> +#ifdef CONFIG_CMD_SF
> +#define CONFIG_SPI_FLASH
> +/* this may vary and depends on the installed chip */
> +#define CONFIG_SPI_FLASH_SST
> +#define CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
> +#define CONFIG_SF_DEFAULT_SPEED		24000000
> +
> +/* (redundant) environemnt in SPI flash */
> +#undef CONFIG_ENV_IS_IN_SPI_FLASH
> +#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
> +#define CONFIG_SYS_REDUNDAND_ENVIRONMENT
> +#define CONFIG_ENV_SIZE			0x1000		/* 4KB */
> +#define CONFIG_ENV_OFFSET		0x40000		/* 256K */
> +#define CONFIG_ENV_OFFSET_REDUND	(CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE)
> +#define CONFIG_ENV_SECT_SIZE		0x1000
> +#define CONFIG_ENV_SPI_CS		0
> +#define CONFIG_ENV_SPI_BUS		2
> +#define CONFIG_ENV_SPI_MAX_HZ		24000000
> +#define CONFIG_ENV_SPI_MODE		SPI_MODE_0
> +#endif
> +#endif
> +#endif
> +
> +/*
>   * Boot Linux
>   */
>  #define CONFIG_CMDLINE_TAG

Hm, good ... so the SPI flash works now with no modifications ?

M