diff options
Diffstat (limited to 'src/drivers/net/smscusb.c')
| -rw-r--r-- | src/drivers/net/smscusb.c | 208 |
1 files changed, 207 insertions, 1 deletions
diff --git a/src/drivers/net/smscusb.c b/src/drivers/net/smscusb.c index d4f3af03..32e24418 100644 --- a/src/drivers/net/smscusb.c +++ b/src/drivers/net/smscusb.c @@ -166,7 +166,7 @@ int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb, /* Check that EEPROM is physically present */ if ( ! is_valid_ether_addr ( netdev->hw_addr ) ) { - DBGC ( smscusb, "SMSCUSB %p has no EEPROM (%s)\n", + DBGC ( smscusb, "SMSCUSB %p has no EEPROM MAC (%s)\n", smscusb, eth_ntoa ( netdev->hw_addr ) ); return -ENODEV; } @@ -178,6 +178,212 @@ int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb, /****************************************************************************** * + * OTP access + * + ****************************************************************************** + */ + +/** + * Power up OTP + * + * @v smscusb SMSC USB device + * @v otp_base OTP register base + * @ret rc Return status code + */ +static int smscusb_otp_power_up ( struct smscusb_device *smscusb, + unsigned int otp_base ) { + uint32_t otp_power; + unsigned int i; + int rc; + + /* Power up OTP */ + if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_POWER ), + 0 ) ) != 0 ) + return rc; + + /* Wait for OTP_POWER_DOWN to become clear */ + for ( i = 0 ; i < SMSCUSB_OTP_MAX_WAIT_MS ; i++ ) { + + /* Read OTP_POWER and check OTP_POWER_DOWN */ + if ( ( rc = smscusb_readl ( smscusb, + ( otp_base + SMSCUSB_OTP_POWER ), + &otp_power ) ) != 0 ) + return rc; + if ( ! ( otp_power & SMSCUSB_OTP_POWER_DOWN ) ) + return 0; + + /* Delay */ + mdelay ( 1 ); + } + + DBGC ( smscusb, "SMSCUSB %p timed out waiting for OTP power up\n", + smscusb ); + return -ETIMEDOUT; +} + +/** + * Wait for OTP to become idle + * + * @v smscusb SMSC USB device + * @v otp_base OTP register base + * @ret rc Return status code + */ +static int smscusb_otp_wait ( struct smscusb_device *smscusb, + unsigned int otp_base ) { + uint32_t otp_status; + unsigned int i; + int rc; + + /* Wait for OTP_STATUS_BUSY to become clear */ + for ( i = 0 ; i < SMSCUSB_OTP_MAX_WAIT_MS ; i++ ) { + + /* Read OTP_STATUS and check OTP_STATUS_BUSY */ + if ( ( rc = smscusb_readl ( smscusb, + ( otp_base + SMSCUSB_OTP_STATUS ), + &otp_status ) ) != 0 ) + return rc; + if ( ! ( otp_status & SMSCUSB_OTP_STATUS_BUSY ) ) + return 0; + + /* Delay */ + mdelay ( 1 ); + } + + DBGC ( smscusb, "SMSCUSB %p timed out waiting for OTP\n", + smscusb ); + return -ETIMEDOUT; +} + +/** + * Read byte from OTP + * + * @v smscusb SMSC USB device + * @v otp_base OTP register base + * @v address OTP address + * @ret byte Byte read, or negative error + */ +static int smscusb_otp_read_byte ( struct smscusb_device *smscusb, + unsigned int otp_base, + unsigned int address ) { + uint8_t addrh = ( address >> 8 ); + uint8_t addrl = ( address >> 0 ); + uint32_t otp_data; + int rc; + + /* Wait for OTP to become idle */ + if ( ( rc = smscusb_otp_wait ( smscusb, otp_base ) ) != 0 ) + return rc; + + /* Initiate read command */ + if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_ADDRH ), + addrh ) ) != 0 ) + return rc; + if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_ADDRL ), + addrl ) ) != 0 ) + return rc; + if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_CMD ), + SMSCUSB_OTP_CMD_READ ) ) != 0 ) + return rc; + if ( ( rc = smscusb_writel ( smscusb, ( otp_base + SMSCUSB_OTP_GO ), + SMSCUSB_OTP_GO_GO ) ) != 0 ) + return rc; + + /* Wait for command to complete */ + if ( ( rc = smscusb_otp_wait ( smscusb, otp_base ) ) != 0 ) + return rc; + + /* Read OTP data */ + if ( ( rc = smscusb_readl ( smscusb, ( otp_base + SMSCUSB_OTP_DATA ), + &otp_data ) ) != 0 ) + return rc; + + return SMSCUSB_OTP_DATA_GET ( otp_data ); +} + +/** + * Read data from OTP + * + * @v smscusb SMSC USB device + * @v otp_base OTP register base + * @v address OTP address + * @v data Data buffer + * @v len Length of data + * @ret rc Return status code + */ +static int smscusb_otp_read ( struct smscusb_device *smscusb, + unsigned int otp_base, unsigned int address, + void *data, size_t len ) { + uint8_t *bytes; + int byte; + int rc; + + /* Power up OTP */ + if ( ( rc = smscusb_otp_power_up ( smscusb, otp_base ) ) != 0 ) + return rc; + + /* Read bytes */ + for ( bytes = data ; len-- ; address++, bytes++ ) { + byte = smscusb_otp_read_byte ( smscusb, otp_base, address ); + if ( byte < 0 ) + return byte; + *bytes = byte; + } + + return 0; +} + +/** + * Fetch MAC address from OTP + * + * @v smscusb SMSC USB device + * @v otp_base OTP register base + * @ret rc Return status code + */ +int smscusb_otp_fetch_mac ( struct smscusb_device *smscusb, + unsigned int otp_base ) { + struct net_device *netdev = smscusb->netdev; + uint8_t signature; + unsigned int address; + int rc; + + /* Read OTP signature byte */ + if ( ( rc = smscusb_otp_read ( smscusb, otp_base, 0, &signature, + sizeof ( signature ) ) ) != 0 ) + return rc; + + /* Determine location of MAC address */ + switch ( signature ) { + case SMSCUSB_OTP_1_SIG: + address = SMSCUSB_OTP_1_MAC; + break; + case SMSCUSB_OTP_2_SIG: + address = SMSCUSB_OTP_2_MAC; + break; + default: + DBGC ( smscusb, "SMSCUSB %p unknown OTP signature %#02x\n", + smscusb, signature ); + return -ENOTSUP; + } + + /* Read MAC address from OTP */ + if ( ( rc = smscusb_otp_read ( smscusb, otp_base, address, + netdev->hw_addr, ETH_ALEN ) ) != 0 ) + return rc; + + /* Check that OTP is valid */ + if ( ! is_valid_ether_addr ( netdev->hw_addr ) ) { + DBGC ( smscusb, "SMSCUSB %p has no layout %#02x OTP MAC (%s)\n", + smscusb, signature, eth_ntoa ( netdev->hw_addr ) ); + return -ENODEV; + } + + DBGC ( smscusb, "SMSCUSB %p using layout %#02x OTP MAC %s\n", + smscusb, signature, eth_ntoa ( netdev->hw_addr ) ); + return 0; +} + +/****************************************************************************** + * * MII access * ****************************************************************************** |