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arm: mvebu: Add support for reading LD0 and LD1 eFuse

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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>
This commit is contained in:
Pali Rohár 2022-04-06 14:18:18 +02:00 committed by Stefan Roese
parent 7001ea3ec4
commit 8b3d7ecdfe
2 changed files with 33 additions and 0 deletions
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28
arch/arm/mach-mvebu/efuse.c
View file

@ -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;

5
arch/arm/mach-mvebu/include/mach/efuse.h
View file

@ -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);