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

Matthias Fuchs
2012-01-18T18:49:42Z

On 01/18/2012 05:07 PM, Marek Vasut wrote:
>> 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 ?
Of course not! The SPI driver needs to be fixed. Either by my previously
posted patch or by god's hands :-)

Fabio asked for this patch in order to test my SPI driver fix.
But I think this is independant from each other.

Matthias