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arm: meson: add sm cmd to retrieve SoC serial

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The Secure Monitor offers multiple services, like returning the
SoC unique serial number, already used to generate an unique MAC
address.

This adds a new, Amlogic specific, "sm" cmd with a "serial" subcommand
to write the SoC unique serial to memory.

This "cm" command will be extended in further patches.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2019-08-06 17:21:02 +02:00
parent 191a374e65
commit 559e6256f8
1 changed files with 48 additions and 0 deletions
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48
arch/arm/mach-meson/sm.c
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@ -77,3 +77,51 @@ int meson_sm_get_serial(void *buffer, size_t size)
return 0;
}
static int do_sm_serial(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
ulong address;
int ret;
if (argc < 2)
return CMD_RET_USAGE;
address = simple_strtoul(argv[1], NULL, 0);
ret = meson_sm_get_serial((void *)address, SM_CHIP_ID_SIZE);
if (ret)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
static cmd_tbl_t cmd_sm_sub[] = {
U_BOOT_CMD_MKENT(serial, 2, 1, do_sm_serial, "", ""),
};
static int do_sm(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
cmd_tbl_t *c;
if (argc < 2)
return CMD_RET_USAGE;
/* Strip off leading 'sm' command argument */
argc--;
argv++;
c = find_cmd_tbl(argv[0], &cmd_sm_sub[0], ARRAY_SIZE(cmd_sm_sub));
if (c)
return c->cmd(cmdtp, flag, argc, argv);
else
return CMD_RET_USAGE;
}
U_BOOT_CMD(
sm, 5, 0, do_sm,
"Secure Monitor Control",
"serial <address> - read chip unique id to memory address"
);