static int google_chromeec_command_version(void)
{
u8 id1, id2, flags;
#if CONFIG_EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
if (read_memmap(&id1, EC_MEMMAP_ID) ||
read_memmap(&id2, EC_MEMMAP_ID + 1) ||
read_memmap(&flags, EC_MEMMAP_HOST_CMD_FLAGS)) {
printk(BIOS_ERR, "Error reading memmap data.\n");
return -1;
}
#else
id1 = read_byte(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID);
id2 = read_byte(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1);
flags = read_byte(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_HOST_CMD_FLAGS);
#endif
if (id1 != 'E' || id2 != 'C') {
printk(BIOS_ERR, "Missing Chromium EC memory map.\n");
return -1;
}
if (flags & EC_HOST_CMD_FLAG_VERSION_3) {
return EC_HOST_CMD_FLAG_VERSION_3;
} else if (flags & EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED) {
return EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED;
} else {
printk(BIOS_ERR,
"Chromium EC command version unsupported\n");
return -1;
}
}
static uint8_t read_byte(uint16_t addr)
{
if (addr >= 0x800 && addr <= 0x9ff)
return read_memmap(addr);
else
return inb(addr);
}