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-rw-r--r--src/drivers/net/smscusb.c208
-rw-r--r--src/drivers/net/smscusb.h44
2 files changed, 251 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
*
******************************************************************************
diff --git a/src/drivers/net/smscusb.h b/src/drivers/net/smscusb.h
index 15233818..8c602dc5 100644
--- a/src/drivers/net/smscusb.h
+++ b/src/drivers/net/smscusb.h
@@ -50,6 +50,48 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** Maximum time to wait for EEPROM (in milliseconds) */
#define SMSCUSB_EEPROM_MAX_WAIT_MS 100
+/** OTP power register offset */
+#define SMSCUSB_OTP_POWER 0x000
+#define SMSCUSB_OTP_POWER_DOWN 0x00000001UL /**< OTP power down */
+
+/** OTP address high byte register offset */
+#define SMSCUSB_OTP_ADDRH 0x004
+
+/** OTP address low byte register offset */
+#define SMSCUSB_OTP_ADDRL 0x008
+
+/** OTP data register offset */
+#define SMSCUSB_OTP_DATA 0x018
+#define SMSCUSB_OTP_DATA_GET(otp_data) \
+ ( ( (otp_data) >> 0 ) & 0xff ) /**< OTP data */
+
+/** OTP command selection register offset */
+#define SMSCUSB_OTP_CMD 0x020
+#define SMSCUSB_OTP_CMD_READ 0x00000001UL /**< Read command */
+
+/** OTP command initiation register offset */
+#define SMSCUSB_OTP_GO 0x028
+#define SMSCUSB_OTP_GO_GO 0x00000001UL /**< Initiate command */
+
+/** OTP status register offset */
+#define SMSCUSB_OTP_STATUS 0x030
+#define SMSCUSB_OTP_STATUS_BUSY 0x00000001UL /**< OTP busy */
+
+/** Maximum time to wait for OTP (in milliseconds) */
+#define SMSCUSB_OTP_MAX_WAIT_MS 100
+
+/** OTP layout 1 signature */
+#define SMSCUSB_OTP_1_SIG 0xf3
+
+/** OTP layout 1 MAC address offset */
+#define SMSCUSB_OTP_1_MAC 0x001
+
+/** OTP layout 2 signature */
+#define SMSCUSB_OTP_2_SIG 0xf7
+
+/** OTP layout 2 MAC address offset */
+#define SMSCUSB_OTP_2_MAC 0x101
+
/** MII access register offset */
#define SMSCUSB_MII_ACCESS 0x000
#define SMSCUSB_MII_ACCESS_PHY_ADDRESS 0x00000800UL /**< PHY address */
@@ -292,6 +334,8 @@ smscusb_mii_init ( struct smscusb_device *smscusb, unsigned int mii_base ) {
extern int smscusb_eeprom_fetch_mac ( struct smscusb_device *smscusb,
unsigned int e2p_base );
+extern int smscusb_otp_fetch_mac ( struct smscusb_device *smscusb,
+ unsigned int otp_base );
extern int smscusb_mii_check_link ( struct smscusb_device *smscusb );
extern int smscusb_mii_open ( struct smscusb_device *smscusb );
extern int smscusb_set_address ( struct smscusb_device *smscusb,
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-10 21:46:45 +0100