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ARM: amlogic: add sm efuse write support and cmd for read/write efuse

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This adds support for amlogic efuse write and provides two subcommands
of "sm" command: "efuseread" and "efusewrite" to read/write bytes between
memory and efuse.

Signed-off-by: Vyacheslav Bocharov <adeep@lexina.in>
[narmstrong: fixed indent at end of patch]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Vyacheslav Bocharov 2021-10-05 15:00:03 +03:00 committed by Neil Armstrong
parent aafc378a6c
commit 52195ba5f5
1 changed files with 67 additions and 1 deletions
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68
arch/arm/mach-meson/sm.c
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@ -68,6 +68,26 @@ ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
return regs.regs[0];
}
ssize_t meson_sm_write_efuse(uintptr_t offset, void *buffer, size_t size)
{
struct pt_regs regs;
meson_init_shmem();
memcpy(shmem_input, buffer, size);
regs.regs[0] = FN_EFUSE_WRITE;
regs.regs[1] = offset;
regs.regs[2] = size;
smc_call(&regs);
if (regs.regs[0] == 0)
return -1;
return 0;
}
#define SM_CHIP_ID_LENGTH 119
#define SM_CHIP_ID_OFFSET 4
#define SM_CHIP_ID_SIZE 12
@ -187,9 +207,53 @@ static int do_sm_reboot_reason(struct cmd_tbl *cmdtp, int flag, int argc,
return CMD_RET_SUCCESS;
}
static int do_efuse_read(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
ulong address, offset, size;
int ret;
if (argc < 4)
return CMD_RET_USAGE;
offset = simple_strtoul(argv[1], NULL, 0);
size = simple_strtoul(argv[2], NULL, 0);
address = simple_strtoul(argv[3], NULL, 0);
ret = meson_sm_read_efuse(offset, (void *)address, size);
if (ret)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
static int do_efuse_write(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
ulong address, offset, size;
int ret;
if (argc < 4)
return CMD_RET_USAGE;
offset = simple_strtoul(argv[1], NULL, 0);
size = simple_strtoul(argv[2], NULL, 0);
address = simple_strtoul(argv[3], NULL, 0);
ret = meson_sm_write_efuse(offset, (void *)address, size);
if (ret)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
static struct cmd_tbl cmd_sm_sub[] = {
U_BOOT_CMD_MKENT(serial, 2, 1, do_sm_serial, "", ""),
U_BOOT_CMD_MKENT(reboot_reason, 1, 1, do_sm_reboot_reason, "", ""),
U_BOOT_CMD_MKENT(efuseread, 4, 1, do_efuse_read, "", ""),
U_BOOT_CMD_MKENT(efusewrite, 4, 0, do_efuse_write, "", ""),
};
static int do_sm(struct cmd_tbl *cmdtp, int flag, int argc,
@ -216,5 +280,7 @@ U_BOOT_CMD(
sm, 5, 0, do_sm,
"Secure Monitor Control",
"serial <address> - read chip unique id to memory address\n"
"sm reboot_reason [name] - get reboot reason and store to to environment"
"sm reboot_reason [name] - get reboot reason and store to to environment\n"
"sm efuseread <offset> <size> <address> - read efuse to memory address\n"
"sm efusewrite <offset> <size> <address> - write into efuse from memory address"
);