/*
* iwl_find_otp_image: find EEPROM image in OTP
* finding the OTP block that contains the EEPROM image.
* the last valid block on the link list (the block _before_ the last block)
* is the block we should read and used to configure the device.
* If all the available OTP blocks are full, the last block will be the block
* we should read and used to configure the device.
* only perform this operation if shadow RAM is disabled
*/
static int iwl_find_otp_image(struct iwl_priv *priv,
u16 *validblockaddr)
{
u16 next_link_addr = 0, link_value = 0, valid_addr;
int ret = 0;
int usedblocks = 0;
/* set addressing mode to absolute to traverse the link list */
iwl_set_otp_access(priv, IWL_OTP_ACCESS_ABSOLUTE);
/* checking for empty OTP or error */
if (iwl_is_otp_empty(priv))
return -EINVAL;
/*
* start traverse link list
* until reach the max number of OTP blocks
* different devices have different number of OTP blocks
*/
do {
/* save current valid block address
* check for more block on the link list
*/
valid_addr = next_link_addr;
next_link_addr = link_value;
IWL_DEBUG_INFO(priv, "OTP blocks %d addr 0x%x\n",
usedblocks, next_link_addr);
if (iwl_read_otp_word(priv, next_link_addr, &link_value))
return -EINVAL;
if (!link_value) {
/*
* reach the end of link list,
* set address point to the starting address
* of the image
*/
goto done;
}
/* more in the link list, continue */
usedblocks++;
} while (usedblocks < priv->cfg->max_ll_items);
/* OTP full, use last block */
IWL_DEBUG_INFO(priv, "OTP is full, use last block\n");
done:
*validblockaddr = valid_addr;
/* skip first 2 bytes (link list pointer) */
*validblockaddr += 2;
return ret;
}
/*
* iwl_find_otp_image: find EEPROM image in OTP
* finding the OTP block that contains the EEPROM image.
* the last valid block on the link list (the block _before_ the last block)
* is the block we should read and used to configure the device.
* If all the available OTP blocks are full, the last block will be the block
* we should read and used to configure the device.
* only perform this operation if shadow RAM is disabled
*/
static int iwl_find_otp_image(struct iwl_trans *trans,
u16 *validblockaddr)
{
u16 next_link_addr = 0, valid_addr;
__le16 link_value = 0;
int usedblocks = 0;
/* set addressing mode to absolute to traverse the link list */
iwl_set_otp_access_absolute(trans);
/* checking for empty OTP or error */
if (iwl_is_otp_empty(trans))
return -EINVAL;
/*
* start traverse link list
* until reach the max number of OTP blocks
* different devices have different number of OTP blocks
*/
do {
/* save current valid block address
* check for more block on the link list
*/
valid_addr = next_link_addr;
next_link_addr = le16_to_cpu(link_value) * sizeof(u16);
IWL_DEBUG_EEPROM(trans->dev, "OTP blocks %d addr 0x%x\n",
usedblocks, next_link_addr);
if (iwl_read_otp_word(trans, next_link_addr, &link_value))
return -EINVAL;
if (!link_value) {
/*
* reach the end of link list, return success and
* set address point to the starting address
* of the image
*/
*validblockaddr = valid_addr;
/* skip first 2 bytes (link list pointer) */
*validblockaddr += 2;
return 0;
}
/* more in the link list, continue */
usedblocks++;
} while (usedblocks <= trans->cfg->base_params->max_ll_items);
/* OTP has no valid blocks */
IWL_DEBUG_EEPROM(trans->dev, "OTP has no valid blocks\n");
return -EINVAL;
}