[U-Boot] [PATCH v3] mmc: atmel: Add atmel sdhci support

[Bo Shen <voice.shen@gmail.com>]

Hi Wenyou,

On 10/26/2015 11:38 AM, Wenyou Yang wrote:
> The SDHCI is introduced by sama5d2, named as Secure Digital Multimedia
> Card Controller(SDMMC). It supports the embedded MultiMedia Card (e.MMC)
> Specification V4.41, the SD Memory Card Specification V3.0, and the SDIO
> V3.0 specification. It is compliant with the SD Host Controller Standard
> V3.0 specification.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> ---
>
> Changes in v3:
>   1./ return -ENODEV instead of -1, when failing to get proper clock.
>   2./ add free host instance when failing to get proper clock.
>
> Changes in v2:
>   - According to Bo Shen's comments,
>   1./ change the macro ATMEL_SDHC_MIN_FRQ -> ATMEL_SDHC_MIN_FREQ.
>   2./ change the return value to -ENOMEM and print log for malloc failure.
>   3./ add the failed return and log for getting improper clock.
>   4./ add more commit log.
>
>   arch/arm/mach-at91/include/mach/atmel_sdhci.h |   13 ++++++++
>   drivers/mmc/Makefile                          |    1 +
>   drivers/mmc/atmel_sdhci.c                     |   40 +++++++++++++++++++++++++
>   3 files changed, 54 insertions(+)
>   create mode 100644 arch/arm/mach-at91/include/mach/atmel_sdhci.h
>   create mode 100644 drivers/mmc/atmel_sdhci.c
>
> diff --git a/arch/arm/mach-at91/include/mach/atmel_sdhci.h b/arch/arm/mach-at91/include/mach/atmel_sdhci.h
> new file mode 100644
> index 0000000..9652bc2
> --- /dev/null
> +++ b/arch/arm/mach-at91/include/mach/atmel_sdhci.h
> @@ -0,0 +1,13 @@
> +/*
> + * Copyright (c) 2015 Atmel Corporation
> + *		      Wenyou.Yang <wenyou.yang@atmel.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#ifndef __ATMEL_SDHCI_H
> +#define __ATMEL_SDHCI_H
> +
> +int atmel_sdhci_init(void *regbase, u32 id);
> +
> +#endif
> diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
> index 99d0295..5d35705 100644
> --- a/drivers/mmc/Makefile
> +++ b/drivers/mmc/Makefile
> @@ -8,6 +8,7 @@
>   obj-$(CONFIG_DM_MMC) += mmc-uclass.o
>
>   obj-$(CONFIG_ARM_PL180_MMCI) += arm_pl180_mmci.o
> +obj-$(CONFIG_ATMEL_SDHCI) += atmel_sdhci.o
>   obj-$(CONFIG_BCM2835_SDHCI) += bcm2835_sdhci.o
>   obj-$(CONFIG_BFIN_SDH) += bfin_sdh.o
>   obj-$(CONFIG_DAVINCI_MMC) += davinci_mmc.o
> diff --git a/drivers/mmc/atmel_sdhci.c b/drivers/mmc/atmel_sdhci.c
> new file mode 100644
> index 0000000..185a36e
> --- /dev/null
> +++ b/drivers/mmc/atmel_sdhci.c
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright (C) 2015 Atmel Corporation
> + *		      Wenyou.Yang <wenyou.yang@atmel.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <malloc.h>
> +#include <sdhci.h>
> +#include <asm/arch/clk.h>
> +
> +#define ATMEL_SDHC_MIN_FREQ	400000
> +
> +int atmel_sdhci_init(void *regbase, u32 id)

I think the regbase type should be u32, if you keep it as "void *", then 
the following don't need to be covert to "void *".

> +{
> +	struct sdhci_host *host = NULL;

I think it is no need to pass NULL to host.

> +	u32 max_clk, min_clk = ATMEL_SDHC_MIN_FREQ;
> +
> +	host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host));

Maybe calloc will be better.

> +	if (!host) {
> +		printf("%s: sdhci_host malloc failed\n", __func__);
> +		return -ENOMEM;
> +	}
> +
> +	host->name = "atmel_sdhci";
> +	host->ioaddr = (void *)regbase;

Here no need to do covert if the original type is the same.

> +	host->quirks = 0;
> +	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
> +	max_clk = at91_get_periph_generated_clk(id);
> +	if (!max_clk) {
> +		printf("%s: Failed to get the proper clock\n", __func__);
> +		free(host);
> +		return -ENODEV;
> +	}
> +
> +	add_sdhci(host, max_clk, min_clk);
> +
> +	return 0;
> +}
>

Best Regards,
Bo Shen