[U-Boot] [PATCH v2 1/4] mmc: fsl_esdhc: Add adapter card type identification support

[York Sun <yorksun@freescale.com>]

+Pantelis

On 04/16/2015 09:51 PM, Yangbo Lu wrote:
> Add adapter card type identification support by reading
> FPGA STAT_PRES1 register SDHC Card ID[0:2] bits. To use this function,
> define CONFIG_FSL_ESDHC_ADAPTER_IDENT.
> 
> Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
> Cc: York Sun <yorksun@freescale.com>
> ---
> Changes for v2:
> 	- Document CONFIG_FSL_ESDHC_ADAPTER_IDENT
> ---
>  arch/powerpc/include/asm/global_data.h |  3 +++
>  board/freescale/common/qixis.h         | 14 +++++++++++++
>  doc/README.fsl-esdhc                   | 25 ++++++++++++++++++----
>  drivers/mmc/fsl_esdhc.c                | 38 +++++++++++++++++++++++++++++++++-
>  drivers/mmc/mmc.c                      |  6 ++++++
>  drivers/mmc/mmc_private.h              |  3 +++
>  include/fsl_esdhc.h                    |  4 ++++
>  7 files changed, 88 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/global_data.h b/arch/powerpc/include/asm/global_data.h
> index c57d9c0..4090975 100644
> --- a/arch/powerpc/include/asm/global_data.h
> +++ b/arch/powerpc/include/asm/global_data.h
> @@ -15,6 +15,9 @@
>  struct arch_global_data {
>  #if defined(CONFIG_FSL_ESDHC)
>  	u32 sdhc_clk;
> +#if defined(CONFIG_FSL_ESDHC_ADAPTER_IDENT)
> +	u8 sdhc_adapter;
> +#endif
>  #endif
>  #if defined(CONFIG_8xx)
>  	unsigned long brg_clk;
> diff --git a/board/freescale/common/qixis.h b/board/freescale/common/qixis.h
> index 52d2021..51ce9c3 100644
> --- a/board/freescale/common/qixis.h
> +++ b/board/freescale/common/qixis.h
> @@ -115,4 +115,18 @@ void qixis_write_i2c(unsigned int reg, u8 value);
>  			qixis_write_i2c(offsetof(struct qixis, reg), value)
>  #endif
>  
> +/* Use for SDHC adapter card type identification and operation */
> +#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
> +#define QIXIS_SDID_MASK                         0x07
> +#define QIXIS_ESDHC_ADAPTER_TYPE_EMMC45         0x1	/* eMMC Card Rev4.5 */
> +#define QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY   0x2	/* SD/MMC Legacy Card */
> +#define QIXIS_ESDHC_ADAPTER_TYPE_EMMC44         0x3	/* eMMC Card Rev4.4 */
> +#define QIXIS_ESDHC_ADAPTER_TYPE_RSV            0x4	/* Reserved */
> +#define QIXIS_ESDHC_ADAPTER_TYPE_MMC            0x5	/* MMC Card */
> +#define QIXIS_ESDHC_ADAPTER_TYPE_SD             0x6	/* SD Card Rev2.0 3.0 */
> +#define QIXIS_ESDHC_NO_ADAPTER                  0x7	/* No Card is Present*/
> +#define QIXIS_SDCLKIN		0x08
> +#define QIXIS_SDCLKOUT		0x02
> +#endif
> +
>  #endif
> diff --git a/doc/README.fsl-esdhc b/doc/README.fsl-esdhc
> index b70f271..29cc661 100644
> --- a/doc/README.fsl-esdhc
> +++ b/doc/README.fsl-esdhc
> @@ -1,5 +1,22 @@
> -CONFIG_SYS_FSL_ESDHC_LE means ESDHC IP is in little-endian mode.
> -CONFIG_SYS_FSL_ESDHC_BE means ESDHC IP is in big-endian mode.
> +Freescale esdhc-specific options
>  
> -Accessing ESDHC registers can be determined by ESDHC IP's endian
> -mode or processor's endian mode.
> +	- CONFIG_FSL_ESDHC_ADAPTER_IDENT
> +		Support Freescale adapter card type identification. This is implemented by
> +		operating Qixis FPGA relevant registers. The STAT_PRES1 register has SDHC
> +		Card ID[0:2] bits showing the type of card installed in the SDHC Adapter Slot.
> +
> +		SDHC Card ID[0:2]	Adapter Card Type
> +		0b000			reserved
> +		0b001			eMMC Card Rev4.5
> +		0b010			SD/MMC Legacy Card
> +		0b011			eMMC Card Rev4.4
> +		0b100			reserved
> +		0b101			MMC Card
> +		0b110			SD Card Rev2.0/3.0
> +		0b111			No card is present
> +	- CONFIG_SYS_FSL_ESDHC_LE
> +		ESDHC IP is in little-endian mode. Accessing ESDHC registers can be
> +		determined by ESDHC IP's endian mode or processor's endian mode.
> +	- CONFIG_SYS_FSL_ESDHC_BE
> +		ESDHC IP is in big-endian mode. Accessing ESDHC registers can be determined
> +		by ESDHC IP's endian mode or processor's endian mode.
> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
> index f5d2ccb..355cada 100644
> --- a/drivers/mmc/fsl_esdhc.c
> +++ b/drivers/mmc/fsl_esdhc.c
> @@ -643,6 +643,39 @@ int fsl_esdhc_mmc_init(bd_t *bis)
>  	return fsl_esdhc_initialize(bis, cfg);
>  }
>  
> +#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
> +void mmc_adapter_card_type_ident(void)
> +{
> +	u8 card_id;
> +	u8 value;
> +
> +	card_id = QIXIS_READ(present) & QIXIS_SDID_MASK;
> +	gd->arch.sdhc_adapter = card_id;
> +
> +	switch (card_id) {
> +	case QIXIS_ESDHC_ADAPTER_TYPE_EMMC45:
> +		break;
> +	case QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY:
> +		break;
> +	case QIXIS_ESDHC_ADAPTER_TYPE_EMMC44:
> +		value = QIXIS_READ(brdcfg[5]);
> +		value |= (QIXIS_SDCLKIN | QIXIS_SDCLKOUT);
> +		QIXIS_WRITE(brdcfg[5], value);
> +		break;
> +	case QIXIS_ESDHC_ADAPTER_TYPE_RSV:
> +		break;
> +	case QIXIS_ESDHC_ADAPTER_TYPE_MMC:
> +		break;
> +	case QIXIS_ESDHC_ADAPTER_TYPE_SD:
> +		break;
> +	case QIXIS_ESDHC_NO_ADAPTER:
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +#endif
> +

Do you foresee any possibility of having similar function on RDB boards or
custom boards?


>  #ifdef CONFIG_OF_LIBFDT
>  void fdt_fixup_esdhc(void *blob, bd_t *bd)
>  {
> @@ -658,7 +691,10 @@ void fdt_fixup_esdhc(void *blob, bd_t *bd)
>  
>  	do_fixup_by_compat_u32(blob, compat, "clock-frequency",
>  			       gd->arch.sdhc_clk, 1);
> -
> +#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
> +	do_fixup_by_compat_u32(blob, compat, "adapter-type",
> +			       (u32)(gd->arch.sdhc_adapter), 1);
> +#endif

How does OS (Linux) use this node? This is not a question to this patch, but for
my understanding.

York