arm: exynos: Read default MMC device from XOM[7:5] pins

XOM pins provide information for iROM bootloader about the boot device.
Those pins are mapped to lower bits of OP_MODE register (0x10000008),
which is common for all Exynos SoC variants. Set the default MMC device id
to reflect the boot device selected by XOM[7:5] pins (2 for the SD or 0 for
the eMMC).

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 arch/arm/mach-exynos/include/mach/cpu.h |  1 +
 board/samsung/common/board.c            | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

On Wed, 15 Jan 2020 15:05:58 +0100
Marek Szyprowski <m.szyprowski at samsung.com> wrote:

> XOM pins provide information for iROM bootloader about the boot
> device. Those pins are mapped to lower bits of OP_MODE register
> (0x10000008), which is common for all Exynos SoC variants. Set the
> default MMC device id to reflect the boot device selected by XOM[7:5]
> pins (2 for the SD or 0 for the eMMC).
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
> ---
>  arch/arm/mach-exynos/include/mach/cpu.h |  1 +
>  board/samsung/common/board.c            | 14 ++++++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm/mach-exynos/include/mach/cpu.h
> b/arch/arm/mach-exynos/include/mach/cpu.h index
> 766edeeb29..fb5fdaf3ba 100644 ---
> a/arch/arm/mach-exynos/include/mach/cpu.h +++
> b/arch/arm/mach-exynos/include/mach/cpu.h @@ -17,6 +17,7 @@
>  
>  #define EXYNOS4_GPIO_PART3_BASE		0x03860000
>  #define EXYNOS4_PRO_ID			0x10000000
> +#define EXYNOS4_OP_MODE			0x10000008
>  #define EXYNOS4_SYSREG_BASE		0x10010000
>  #define EXYNOS4_POWER_BASE		0x10020000
>  #define EXYNOS4_SWRESET			0x10020400
> diff --git a/board/samsung/common/board.c
> b/board/samsung/common/board.c index ee2fc7971e..ac91c0a6fb 100644
> --- a/board/samsung/common/board.c
> +++ b/board/samsung/common/board.c
> @@ -359,3 +359,17 @@ int board_usb_cleanup(int index, enum
> usb_init_type init) #endif
>  	return 0;
>  }
> +
> +/**
> + * mmc_get_env_dev() - read boot MMC device id from XOM[7:5] pins.
> + */
> +int mmc_get_env_dev(void)
> +{
> +	u32 mode = readl(EXYNOS4_OP_MODE) & 0x1C;
> +
> +	if (mode == 0x04)
> +		return 2; /* MMC2: SD */
> +
> +	/* MMC0: eMMC or unknown */
> +	return 0;
> +}

Reviewed-by: Lukasz Majewski <lukma at denx.de>


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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Hi Marek,

On Wed, 15 Jan 2020 at 19:36, Marek Szyprowski <m.szyprowski at samsung.com> wrote:
>
> XOM pins provide information for iROM bootloader about the boot device.
> Those pins are mapped to lower bits of OP_MODE register (0x10000008),
> which is common for all Exynos SoC variants. Set the default MMC device id
> to reflect the boot device selected by XOM[7:5] pins (2 for the SD or 0 for
> the eMMC).
>
> Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
> ---
>  arch/arm/mach-exynos/include/mach/cpu.h |  1 +
>  board/samsung/common/board.c            | 14 ++++++++++++++
>  2 files changed, 15 insertions(+)
>
> diff --git a/arch/arm/mach-exynos/include/mach/cpu.h b/arch/arm/mach-exynos/include/mach/cpu.h
> index 766edeeb29..fb5fdaf3ba 100644
> --- a/arch/arm/mach-exynos/include/mach/cpu.h
> +++ b/arch/arm/mach-exynos/include/mach/cpu.h
> @@ -17,6 +17,7 @@
>
>  #define EXYNOS4_GPIO_PART3_BASE                0x03860000
>  #define EXYNOS4_PRO_ID                 0x10000000
> +#define EXYNOS4_OP_MODE                        0x10000008
>  #define EXYNOS4_SYSREG_BASE            0x10010000
>  #define EXYNOS4_POWER_BASE             0x10020000
>  #define EXYNOS4_SWRESET                        0x10020400
> diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
> index ee2fc7971e..ac91c0a6fb 100644
> --- a/board/samsung/common/board.c
> +++ b/board/samsung/common/board.c
> @@ -359,3 +359,17 @@ int board_usb_cleanup(int index, enum usb_init_type init)
>  #endif
>         return 0;
>  }
> +
> +/**
> + * mmc_get_env_dev() - read boot MMC device id from XOM[7:5] pins.
> + */
> +int mmc_get_env_dev(void)
> +{
> +       u32 mode = readl(EXYNOS4_OP_MODE) & 0x1C;
> +
> +       if (mode == 0x04)
> +               return 2; /* MMC2: SD */
> +
> +       /* MMC0: eMMC or unknown */
> +       return 0;
> +}
> --
> 2.17.1
>
If you could add some debug prints which boot mode got selected,
It will be much help. Please add my

Reviewed-by: Anand Moon <linux.amoon at gmail.com>

-Anand