[smscusb] Add ability to read MAC address from OTP
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
parent
b1df34d7bd
commit
d4df9f573f
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@ -166,7 +166,7 @@ int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb,
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/* Check that EEPROM is physically present */
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if ( ! is_valid_ether_addr ( netdev->hw_addr ) ) {
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DBGC ( smscusb, "SMSCUSB %p has no EEPROM (%s)\n",
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DBGC ( smscusb, "SMSCUSB %p has no EEPROM MAC (%s)\n",
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smscusb, eth_ntoa ( netdev->hw_addr ) );
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return -ENODEV;
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}
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@ -176,6 +176,212 @@ int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb,
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return 0;
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}
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/******************************************************************************
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*
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* OTP access
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*
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******************************************************************************
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*/
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/**
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* Power up OTP
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*
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* @v smscusb SMSC USB device
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* @v otp_base OTP register base
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* @ret rc Return status code
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*/
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static int smscusb_otp_power_up ( struct smscusb_device *smscusb,
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unsigned int otp_base ) {
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uint32_t otp_power;
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unsigned int i;
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int rc;
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/* Power up OTP */
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if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_POWER ),
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0 ) ) != 0 )
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return rc;
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/* Wait for OTP_POWER_DOWN to become clear */
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for ( i = 0 ; i < SMSCUSB_OTP_MAX_WAIT_MS ; i++ ) {
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/* Read OTP_POWER and check OTP_POWER_DOWN */
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if ( ( rc = smscusb_readl ( smscusb,
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( otp_base + SMSCUSB_OTP_POWER ),
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&otp_power ) ) != 0 )
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return rc;
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if ( ! ( otp_power & SMSCUSB_OTP_POWER_DOWN ) )
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return 0;
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/* Delay */
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mdelay ( 1 );
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}
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DBGC ( smscusb, "SMSCUSB %p timed out waiting for OTP power up\n",
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smscusb );
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return -ETIMEDOUT;
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}
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/**
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* Wait for OTP to become idle
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*
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* @v smscusb SMSC USB device
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* @v otp_base OTP register base
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* @ret rc Return status code
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*/
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static int smscusb_otp_wait ( struct smscusb_device *smscusb,
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unsigned int otp_base ) {
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uint32_t otp_status;
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unsigned int i;
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int rc;
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/* Wait for OTP_STATUS_BUSY to become clear */
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for ( i = 0 ; i < SMSCUSB_OTP_MAX_WAIT_MS ; i++ ) {
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/* Read OTP_STATUS and check OTP_STATUS_BUSY */
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if ( ( rc = smscusb_readl ( smscusb,
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( otp_base + SMSCUSB_OTP_STATUS ),
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&otp_status ) ) != 0 )
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return rc;
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if ( ! ( otp_status & SMSCUSB_OTP_STATUS_BUSY ) )
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return 0;
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/* Delay */
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mdelay ( 1 );
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}
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DBGC ( smscusb, "SMSCUSB %p timed out waiting for OTP\n",
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smscusb );
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return -ETIMEDOUT;
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}
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/**
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* Read byte from OTP
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*
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* @v smscusb SMSC USB device
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* @v otp_base OTP register base
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* @v address OTP address
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* @ret byte Byte read, or negative error
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*/
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static int smscusb_otp_read_byte ( struct smscusb_device *smscusb,
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unsigned int otp_base,
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unsigned int address ) {
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uint8_t addrh = ( address >> 8 );
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uint8_t addrl = ( address >> 0 );
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uint32_t otp_data;
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int rc;
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/* Wait for OTP to become idle */
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if ( ( rc = smscusb_otp_wait ( smscusb, otp_base ) ) != 0 )
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return rc;
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/* Initiate read command */
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if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_ADDRH ),
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addrh ) ) != 0 )
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return rc;
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if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_ADDRL ),
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addrl ) ) != 0 )
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return rc;
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if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_CMD ),
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SMSCUSB_OTP_CMD_READ ) ) != 0 )
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return rc;
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if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_GO ),
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SMSCUSB_OTP_GO_GO ) ) != 0 )
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return rc;
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/* Wait for command to complete */
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if ( ( rc = smscusb_otp_wait ( smscusb, otp_base ) ) != 0 )
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return rc;
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/* Read OTP data */
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if ( ( rc = smscusb_readl ( smscusb, ( otp_base + SMSCUSB_OTP_DATA ),
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&otp_data ) ) != 0 )
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return rc;
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return SMSCUSB_OTP_DATA_GET ( otp_data );
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}
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/**
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* Read data from OTP
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*
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* @v smscusb SMSC USB device
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* @v otp_base OTP register base
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* @v address OTP address
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* @v data Data buffer
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* @v len Length of data
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* @ret rc Return status code
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*/
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static int smscusb_otp_read ( struct smscusb_device *smscusb,
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unsigned int otp_base, unsigned int address,
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void *data, size_t len ) {
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uint8_t *bytes;
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int byte;
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int rc;
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/* Power up OTP */
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if ( ( rc = smscusb_otp_power_up ( smscusb, otp_base ) ) != 0 )
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return rc;
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/* Read bytes */
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for ( bytes = data ; len-- ; address++, bytes++ ) {
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byte = smscusb_otp_read_byte ( smscusb, otp_base, address );
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if ( byte < 0 )
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return byte;
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*bytes = byte;
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}
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return 0;
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}
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/**
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* Fetch MAC address from OTP
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*
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* @v smscusb SMSC USB device
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* @v otp_base OTP register base
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* @ret rc Return status code
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*/
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int smscusb_otp_fetch_mac ( struct smscusb_device *smscusb,
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unsigned int otp_base ) {
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struct net_device *netdev = smscusb->netdev;
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uint8_t signature;
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unsigned int address;
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int rc;
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/* Read OTP signature byte */
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if ( ( rc = smscusb_otp_read ( smscusb, otp_base, 0, &signature,
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sizeof ( signature ) ) ) != 0 )
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return rc;
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/* Determine location of MAC address */
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switch ( signature ) {
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case SMSCUSB_OTP_1_SIG:
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address = SMSCUSB_OTP_1_MAC;
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break;
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case SMSCUSB_OTP_2_SIG:
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address = SMSCUSB_OTP_2_MAC;
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break;
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default:
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DBGC ( smscusb, "SMSCUSB %p unknown OTP signature %#02x\n",
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smscusb, signature );
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return -ENOTSUP;
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}
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/* Read MAC address from OTP */
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if ( ( rc = smscusb_otp_read ( smscusb, otp_base, address,
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netdev->hw_addr, ETH_ALEN ) ) != 0 )
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return rc;
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/* Check that OTP is valid */
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if ( ! is_valid_ether_addr ( netdev->hw_addr ) ) {
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DBGC ( smscusb, "SMSCUSB %p has no layout %#02x OTP MAC (%s)\n",
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smscusb, signature, eth_ntoa ( netdev->hw_addr ) );
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return -ENODEV;
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}
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DBGC ( smscusb, "SMSCUSB %p using layout %#02x OTP MAC %s\n",
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smscusb, signature, eth_ntoa ( netdev->hw_addr ) );
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return 0;
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}
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/******************************************************************************
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*
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* MII access
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@ -50,6 +50,48 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** Maximum time to wait for EEPROM (in milliseconds) */
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#define SMSCUSB_EEPROM_MAX_WAIT_MS 100
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/** OTP power register offset */
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#define SMSCUSB_OTP_POWER 0x000
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#define SMSCUSB_OTP_POWER_DOWN 0x00000001UL /**< OTP power down */
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/** OTP address high byte register offset */
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#define SMSCUSB_OTP_ADDRH 0x004
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/** OTP address low byte register offset */
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#define SMSCUSB_OTP_ADDRL 0x008
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/** OTP data register offset */
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#define SMSCUSB_OTP_DATA 0x018
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#define SMSCUSB_OTP_DATA_GET(otp_data) \
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( ( (otp_data) >> 0 ) & 0xff ) /**< OTP data */
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/** OTP command selection register offset */
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#define SMSCUSB_OTP_CMD 0x020
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#define SMSCUSB_OTP_CMD_READ 0x00000001UL /**< Read command */
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/** OTP command initiation register offset */
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#define SMSCUSB_OTP_GO 0x028
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#define SMSCUSB_OTP_GO_GO 0x00000001UL /**< Initiate command */
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/** OTP status register offset */
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#define SMSCUSB_OTP_STATUS 0x030
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#define SMSCUSB_OTP_STATUS_BUSY 0x00000001UL /**< OTP busy */
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/** Maximum time to wait for OTP (in milliseconds) */
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#define SMSCUSB_OTP_MAX_WAIT_MS 100
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/** OTP layout 1 signature */
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#define SMSCUSB_OTP_1_SIG 0xf3
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/** OTP layout 1 MAC address offset */
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#define SMSCUSB_OTP_1_MAC 0x001
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/** OTP layout 2 signature */
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#define SMSCUSB_OTP_2_SIG 0xf7
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/** OTP layout 2 MAC address offset */
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#define SMSCUSB_OTP_2_MAC 0x101
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/** MII access register offset */
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#define SMSCUSB_MII_ACCESS 0x000
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#define SMSCUSB_MII_ACCESS_PHY_ADDRESS 0x00000800UL /**< PHY address */
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@ -292,6 +334,8 @@ smscusb_mii_init ( struct smscusb_device *smscusb, unsigned int mii_base ) {
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extern int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb,
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unsigned int e2p_base );
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extern int smscusb_otp_fetch_mac ( struct smscusb_device *smscusb,
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unsigned int otp_base );
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extern int smscusb_mii_check_link ( struct smscusb_device *smscusb );
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extern int smscusb_mii_open ( struct smscusb_device *smscusb );
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extern int smscusb_set_address ( struct smscusb_device *smscusb,
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