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

Marek Vasut
2012-01-18T16:07:03Z

> 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