/**
* Perform a flash read or write command
*
* @param dev CROS-EC device to read/write
* @param is_write 1 do to a write, 0 to do a read
* @param argc Number of arguments
* @param argv Arguments (2 is region, 3 is address)
* @return 0 for ok, 1 for a usage error or -ve for ec command error
* (negative EC_RES_...)
*/
static int do_read_write(struct cros_ec_dev *dev, int is_write, int argc,
char * const argv[])
{
uint32_t offset, size = -1U, region_size;
unsigned long addr;
char *endp;
int region;
int ret;
region = cros_ec_decode_region(argc - 2, argv + 2);
if (region == -1)
return 1;
if (argc < 4)
return 1;
addr = simple_strtoul(argv[3], &endp, 16);
if (*argv[3] == 0 || *endp != 0)
return 1;
if (argc > 4) {
size = simple_strtoul(argv[4], &endp, 16);
if (*argv[4] == 0 || *endp != 0)
return 1;
}
ret = cros_ec_flash_offset(dev, region, &offset, ®ion_size);
if (ret) {
debug("%s: Could not read region info\n", __func__);
return ret;
}
if (size == -1U)
size = region_size;
ret = is_write ?
cros_ec_flash_write(dev, (uint8_t *)addr, offset, size) :
cros_ec_flash_read(dev, (uint8_t *)addr, offset, size);
if (ret) {
debug("%s: Could not %s region\n", __func__,
is_write ? "write" : "read");
return ret;
}
return 0;
}
int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
int image_size)
{
uint32_t rw_offset, rw_size;
int ret;
if (cros_ec_flash_offset(dev, EC_FLASH_REGION_ACTIVE, &rw_offset,
&rw_size))
return -1;
if (image_size > (int)rw_size)
return -1;
/* Invalidate the existing hash, just in case the AP reboots
* unexpectedly during the update. If that happened, the EC RW firmware
* would be invalid, but the EC would still have the original hash.
*/
ret = cros_ec_invalidate_hash(dev);
if (ret)
return ret;
/*
* Erase the entire RW section, so that the EC doesn't see any garbage
* past the new image if it's smaller than the current image.
*
* TODO: could optimize this to erase just the current image, since
* presumably everything past that is 0xff's. But would still need to
* round up to the nearest multiple of erase size.
*/
ret = cros_ec_flash_erase(dev, rw_offset, rw_size);
if (ret)
return ret;
/* Write the image */
ret = cros_ec_flash_write(dev, image, rw_offset, image_size);
if (ret)
return ret;
return 0;
}