smsc9420: add ethtool eeprom support

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 124 insertions, 0 deletions

diff --git a/drivers/net/smsc9420.c b/drivers/net/smsc9420.c
index 80dab8bea76c..2a8e9b71de92 100644
--- a/drivers/net/smsc9420.c
+++ b/drivers/net/smsc9420.c
@@ -293,6 +293,124 @@ static int smsc9420_ethtool_nway_reset(struct net_device *netdev)
         return phy_start_aneg(pd->phy_dev);
 }
 
+static void smsc9420_eeprom_enable_access(struct smsc9420_pdata *pd)
+{
+        unsigned int temp = smsc9420_reg_read(pd, GPIO_CFG);
+        temp &= ~GPIO_CFG_EEPR_EN_;
+        smsc9420_reg_write(pd, GPIO_CFG, temp);
+        msleep(1);
+}
+
+static int smsc9420_eeprom_send_cmd(struct smsc9420_pdata *pd, u32 op)
+{
+        int timeout = 100;
+        u32 e2cmd;
+
+        smsc_dbg(HW, "op 0x%08x", op);
+        if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
+                smsc_warn(HW, "Busy at start");
+                return -EBUSY;
+        }
+
+        e2cmd = op | E2P_CMD_EPC_BUSY_;
+        smsc9420_reg_write(pd, E2P_CMD, e2cmd);
+
+        do {
+                msleep(1);
+                e2cmd = smsc9420_reg_read(pd, E2P_CMD);
+        } while ((e2cmd & E2P_CMD_EPC_BUSY_) && (timeout--));
+
+        if (!timeout) {
+                smsc_info(HW, "TIMED OUT");
+                return -EAGAIN;
+        }
+
+        if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
+                smsc_info(HW, "Error occured during eeprom operation");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int smsc9420_eeprom_read_location(struct smsc9420_pdata *pd,
+                                         u8 address, u8 *data)
+{
+        u32 op = E2P_CMD_EPC_CMD_READ_ | address;
+        int ret;
+
+        smsc_dbg(HW, "address 0x%x", address);
+        ret = smsc9420_eeprom_send_cmd(pd, op);
+
+        if (!ret)
+                data[address] = smsc9420_reg_read(pd, E2P_DATA);
+
+        return ret;
+}
+
+static int smsc9420_eeprom_write_location(struct smsc9420_pdata *pd,
+                                          u8 address, u8 data)
+{
+        u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
+        int ret;
+
+        smsc_dbg(HW, "address 0x%x, data 0x%x", address, data);
+        ret = smsc9420_eeprom_send_cmd(pd, op);
+
+        if (!ret) {
+                op = E2P_CMD_EPC_CMD_WRITE_ | address;
+                smsc9420_reg_write(pd, E2P_DATA, (u32)data);
+                ret = smsc9420_eeprom_send_cmd(pd, op);
+        }
+
+        return ret;
+}
+
+static int smsc9420_ethtool_get_eeprom_len(struct net_device *dev)
+{
+        return SMSC9420_EEPROM_SIZE;
+}
+
+static int smsc9420_ethtool_get_eeprom(struct net_device *dev,
+                                       struct ethtool_eeprom *eeprom, u8 *data)
+{
+        struct smsc9420_pdata *pd = netdev_priv(dev);
+        u8 eeprom_data[SMSC9420_EEPROM_SIZE];
+        int len, i;
+
+        smsc9420_eeprom_enable_access(pd);
+
+        len = min(eeprom->len, SMSC9420_EEPROM_SIZE);
+        for (i = 0; i < len; i++) {
+                int ret = smsc9420_eeprom_read_location(pd, i, eeprom_data);
+                if (ret < 0) {
+                        eeprom->len = 0;
+                        return ret;
+                }
+        }
+
+        memcpy(data, &eeprom_data[eeprom->offset], len);
+        eeprom->len = len;
+        return 0;
+}
+
+static int smsc9420_ethtool_set_eeprom(struct net_device *dev,
+                                       struct ethtool_eeprom *eeprom, u8 *data)
+{
+        struct smsc9420_pdata *pd = netdev_priv(dev);
+        int ret;
+
+        smsc9420_eeprom_enable_access(pd);
+        smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
+        ret = smsc9420_eeprom_write_location(pd, eeprom->offset, *data);
+        smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWDS_);
+
+        /* Single byte write, according to man page */
+        eeprom->len = 1;
+
+        return ret;
+}
+
 static const struct ethtool_ops smsc9420_ethtool_ops = {
         .get_settings = smsc9420_ethtool_get_settings,
         .set_settings = smsc9420_ethtool_set_settings,
@@ -301,6 +419,9 @@ static const struct ethtool_ops smsc9420_ethtool_ops = {
         .set_msglevel = smsc9420_ethtool_set_msglevel,
         .nway_reset = smsc9420_ethtool_nway_reset,
         .get_link = ethtool_op_get_link,
+        .get_eeprom_len = smsc9420_ethtool_get_eeprom_len,
+        .get_eeprom = smsc9420_ethtool_get_eeprom,
+        .set_eeprom = smsc9420_ethtool_set_eeprom,
 };
 
 /* Sets the device MAC address to dev_addr */
diff --git a/drivers/net/smsc9420.h b/drivers/net/smsc9420.h
index afda2d249eb6..80c426dc4325 100644
--- a/drivers/net/smsc9420.h
+++ b/drivers/net/smsc9420.h
@@ -43,6 +43,8 @@
 
 #define LAN_REGISTER_EXTENT             (0x400)
 
+#define SMSC9420_EEPROM_SIZE            ((u32)11)
+
 #define FLOW_CTRL_TX                    (1)
 #define FLOW_CTRL_RX                    (2)
 
@@ -238,6 +240,7 @@
 #define GPIO_CFG_LED_3_                 (0x40000000)
 #define GPIO_CFG_LED_2_                 (0x20000000)
 #define GPIO_CFG_LED_1_                 (0x10000000)
+#define GPIO_CFG_EEPR_EN_               (0x00700000)
 
 #define GPT_CFG                         (0xD4)
 #define GPT_CFG_TIMER_EN_               (0x20000000)