[PATCH] arm: mvebu: Add support for reading LD0 and LD1 eFuse

[Stefan Roese]

On 4/6/22 14:18, Pali Rohár wrote:
> Armada 385 contains 64 lines of HD eFuse and 2 lines of LD eFuse. HD eFuse
> is used for secure boot and each line is 64 bits long + 1 lock bit. LD
> eFuse lines are 256 bits long + 1 lock bit. LD 0 line is reserved for
> Marvell Internal Use and LD 1 line is for General Purpose Data. U-Boot
> already contains HD eFuse reading and programming support.
> 
> This patch implements LD eFuse reading support. LD 0 line is mapped to
> U-Boot fuse bank 64 and LD 1 line to fuse bank 65.
> 
> LD 0 Marvell Internal Use line seems that was burned in factory with some
> data and can be read by U-Boot fuse command:
> 
>    => fuse read 64 0 9
> 
> LD 1 General Purpose Data line is by default empty and can be read by
> U-Boot fuse command:
> 
>    => fuse read 65 0 9
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>

Applied to u-boot-marvell/master

Thanks,
Stefan

> ---
>   arch/arm/mach-mvebu/efuse.c              | 28 ++++++++++++++++++++++++
>   arch/arm/mach-mvebu/include/mach/efuse.h |  5 +++++
>   2 files changed, 33 insertions(+)
> 
> diff --git a/arch/arm/mach-mvebu/efuse.c b/arch/arm/mach-mvebu/efuse.c
> index c79eee98fe98..80318c339eb7 100644
> --- a/arch/arm/mach-mvebu/efuse.c
> +++ b/arch/arm/mach-mvebu/efuse.c
> @@ -27,6 +27,7 @@
>   
>   enum {
>   	MVEBU_EFUSE_CTRL_PROGRAM_ENABLE = (1 << 31),
> +	MVEBU_EFUSE_LD1_SELECT          = (1 <<  6),
>   };
>   
>   struct mvebu_hd_efuse {
> @@ -39,8 +40,10 @@ struct mvebu_hd_efuse {
>   #ifndef DRY_RUN
>   static struct mvebu_hd_efuse *efuses =
>   	(struct mvebu_hd_efuse *)(MBUS_EFUSE_BASE + 0xF9000);
> +static u32 *ld_efuses = (void *)MBUS_EFUSE_BASE + 0xF8F00;
>   #else
>   static struct mvebu_hd_efuse efuses[EFUSE_LINE_MAX + 1];
> +static u32 ld_efuses[EFUSE_LD_WORDS];
>   #endif
>   
>   static int efuse_initialised;
> @@ -169,6 +172,21 @@ int mvebu_read_efuse(int nr, struct efuse_val *val)
>   	return 0;
>   }
>   
> +void mvebu_read_ld_efuse(int ld1, u32 *line)
> +{
> +	int i;
> +
> +#ifndef DRY_RUN
> +	if (ld1)
> +		setbits_le32(MVEBU_EFUSE_CONTROL, MVEBU_EFUSE_LD1_SELECT);
> +	else
> +		clrbits_le32(MVEBU_EFUSE_CONTROL, MVEBU_EFUSE_LD1_SELECT);
> +#endif
> +
> +	for (i = 0; i < EFUSE_LD_WORDS; i++)
> +		line[i] = readl(ld_efuses + i);
> +}
> +
>   int mvebu_write_efuse(int nr, struct efuse_val *val)
>   {
>   	return prog_efuse(nr, val, ~0, ~0);
> @@ -199,8 +217,18 @@ static int valid_prog_words;
>   int fuse_read(u32 bank, u32 word, u32 *val)
>   {
>   	struct efuse_val fuse_line;
> +	u32 ld_line[EFUSE_LD_WORDS];
>   	int res;
>   
> +	if ((bank == EFUSE_LD0_LINE || bank == EFUSE_LD1_LINE) && word < EFUSE_LD_WORDS) {
> +		res = mvebu_efuse_init_hw();
> +		if (res)
> +			return res;
> +		mvebu_read_ld_efuse(bank == EFUSE_LD1_LINE, ld_line);
> +		*val = ld_line[word];
> +		return 0;
> +	}
> +
>   	if (bank < EFUSE_LINE_MIN || bank > EFUSE_LINE_MAX || word > 2)
>   		return -EINVAL;
>   
> diff --git a/arch/arm/mach-mvebu/include/mach/efuse.h b/arch/arm/mach-mvebu/include/mach/efuse.h
> index bbc5844d849c..122e735f2fc7 100644
> --- a/arch/arm/mach-mvebu/include/mach/efuse.h
> +++ b/arch/arm/mach-mvebu/include/mach/efuse.h
> @@ -53,8 +53,13 @@ enum efuse_line {
>   
>   	EFUSE_LINE_MIN = 0,
>   	EFUSE_LINE_MAX = 63,
> +
> +	EFUSE_LD0_LINE = 64,
> +	EFUSE_LD1_LINE = 65,
>   };
>   
> +#define EFUSE_LD_WORDS 9
> +
>   #endif
>   
>   int mvebu_efuse_init_hw(void);

Viele Grüße,
Stefan Roese

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de