diff options
| author | Pali Rohár | 2022-04-06 14:18:18 +0200 |
|---|---|---|
| committer | Stefan Roese | 2022-04-21 12:31:36 +0200 |
| commit | 8b3d7ecdfec30d63684d86bd76632929b72d8a84 (patch) | |
| tree | c58aab7bc8c7670ff6547b18c9ebbb2dca71e680 | |
| parent | 7001ea3ec408cbc801fc21054927ca1f4840ff79 (diff) | |
arm: mvebu: Add support for reading LD0 and LD1 eFuse
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@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
| -rw-r--r-- | arch/arm/mach-mvebu/efuse.c | 28 | ||||
| -rw-r--r-- | arch/arm/mach-mvebu/include/mach/efuse.h | 5 |
2 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-mvebu/efuse.c b/arch/arm/mach-mvebu/efuse.c index c79eee98fe9..80318c339eb 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 bbc5844d849..122e735f2fc 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); |