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arm: mvebu: a37xx: Add support for writing Security OTP values

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Implement write support for Security OTP values via mailbox API commands
MBOX_CMD_OTP_WRITE_32B and MBOX_CMD_OTP_WRITE.

Write support for North and South Bridge OTPs are not implemented as these
OTPs are already burned in factory with some data.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Pali Rohár 2022-04-07 11:32:10 +02:00 committed by Stefan Roese
parent 2975bba6df
commit 1d71bbca45
1 changed files with 48 additions and 2 deletions
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46
arch/arm/mach-mvebu/armada3700/efuse.c
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@ -113,6 +113,41 @@ static int rwtm_otp_read(u8 row, u32 word, u32 *data)
return res;
}
static int rwtm_otp_write(u8 row, u32 word, u32 data)
{
u32 in[4];
int res = -EINVAL;
if (word < 2) {
/*
* MBOX_CMD_OTP_WRITE_32B command is supported by Marvell
* fuse.bin firmware and also by new CZ.NIC wtmi firmware.
* This command writes only selected bits to OTP and does
* not calculate ECC bits. It does not allow to write the
* lock bit.
*/
in[0] = row;
in[1] = word * 32;
in[2] = data;
res = mbox_do_cmd(MBOX_CMD_OTP_WRITE_32B, in, 3, NULL, 0);
} else if (word == 2 && !(data & ~0x1)) {
/*
* MBOX_CMD_OTP_WRITE command is supported only by new CZ.NIC
* wtmi firmware and allows to write any bit to OTP, including
* the lock bit. It does not calculate or write ECC bits too.
* For compatibility with Marvell fuse.bin firmware, use this
* command only for writing the lock bit.
*/
in[0] = row;
in[1] = 0;
in[2] = 0;
in[3] = data;
res = mbox_do_cmd(MBOX_CMD_OTP_WRITE, in, 4, NULL, 0);
}
return res;
}
/*
* Banks 0-43 are used for accessing Security OTP (44 rows with 67 bits via 44 banks and words 0-2)
* Bank 44 is used for accessing North Bridge OTP (69 bits via words 0-2)
@ -154,8 +189,19 @@ int fuse_read(u32 bank, u32 word, u32 *val)
int fuse_prog(u32 bank, u32 word, u32 val)
{
if (bank <= RWTM_MAX_BANK) {
if (word >= RWTM_ROW_WORDS)
return -EINVAL;
return rwtm_otp_write(bank, word, val);
} else if (bank == OTP_NB_BANK) {
/* TODO: not implemented yet */
return -ENOSYS;
} else if (bank == OTP_SB_BANK) {
/* TODO: not implemented yet */
return -ENOSYS;
} else {
return -EINVAL;
}
}
int fuse_sense(u32 bank, u32 word, u32 *val)