net: ks8851: Use 16-bit writes to program MAC address

On the SPI variant of KS8851, the MAC address can be programmed with
either 8/16/32-bit writes. To make it easier to support the 16-bit
parallel option of KS8851 too, switch both the MAC address programming
and readout to 16-bit operations.

Remove ks8851_wrreg8() as it is not used anywhere anymore.

There should be no functional change.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Petr Stetiar <ynezz@true.cz>
Cc: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index 8df130e..1b81340 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -186,36 +186,6 @@ static void ks8851_wrreg16(struct ks8851_net *ks, unsigned reg, unsigned val)
 }
 
 /**
- * ks8851_wrreg8 - write 8bit register value to chip
- * @ks: The chip state
- * @reg: The register address
- * @val: The value to write
- *
- * Issue a write to put the value @val into the register specified in @reg.
- */
-static void ks8851_wrreg8(struct ks8851_net *ks, unsigned reg, unsigned val)
-{
-       struct spi_transfer *xfer = &ks->spi_xfer1;
-       struct spi_message *msg = &ks->spi_msg1;
-       __le16 txb[2];
-       int ret;
-       int bit;
-
-       bit = 1 << (reg & 3);
-
-       txb[0] = cpu_to_le16(MK_OP(bit, reg) | KS_SPIOP_WR);
-       txb[1] = val;
-
-       xfer->tx_buf = txb;
-       xfer->rx_buf = NULL;
-       xfer->len = 3;
-
-       ret = spi_sync(ks->spidev, msg);
-       if (ret < 0)
-               netdev_err(ks->netdev, "spi_sync() failed\n");
-}
-
-/**
  * ks8851_rdreg - issue read register command and return the data
  * @ks: The device state
  * @op: The register address and byte enables in message format.
@@ -349,6 +319,7 @@ static void ks8851_set_powermode(struct ks8851_net *ks, unsigned pwrmode)
 static int ks8851_write_mac_addr(struct net_device *dev)
 {
        struct ks8851_net *ks = netdev_priv(dev);
+       u16 val;
        int i;
 
        mutex_lock(&ks->lock);
@@ -358,8 +329,12 @@ static int ks8851_write_mac_addr(struct net_device *dev)
         * the first write to the MAC address does not take effect.
         */
        ks8851_set_powermode(ks, PMECR_PM_NORMAL);
-       for (i = 0; i < ETH_ALEN; i++)
-               ks8851_wrreg8(ks, KS_MAR(i), dev->dev_addr[i]);
+
+       for (i = 0; i < ETH_ALEN; i += 2) {
+               val = (dev->dev_addr[i] << 8) | dev->dev_addr[i + 1];
+               ks8851_wrreg16(ks, KS_MAR(i), val);
+       }
+
        if (!netif_running(dev))
                ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
 
@@ -377,12 +352,16 @@ static int ks8851_write_mac_addr(struct net_device *dev)
 static void ks8851_read_mac_addr(struct net_device *dev)
 {
        struct ks8851_net *ks = netdev_priv(dev);
+       u16 reg;
        int i;
 
        mutex_lock(&ks->lock);
 
-       for (i = 0; i < ETH_ALEN; i++)
-               dev->dev_addr[i] = ks8851_rdreg8(ks, KS_MAR(i));
+       for (i = 0; i < ETH_ALEN; i += 2) {
+               reg = ks8851_rdreg16(ks, KS_MAR(i));
+               dev->dev_addr[i] = reg >> 8;
+               dev->dev_addr[i + 1] = reg & 0xff;
+       }
 
        mutex_unlock(&ks->lock);
 }

diff --git a/drivers/net/ethernet/micrel/ks8851.h b/drivers/net/ethernet/micrel/ks8851.h
index 8f834ae..f210d18 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8851.h
+++ b/drivers/net/ethernet/micrel/ks8851.h
@@ -19,7 +19,7 @@
 #define CCR_32PIN                              (1 << 0)    /* KSZ8851SNL    */
 
 /* MAC address registers */
-#define KS_MAR(_m)                             (0x15 - (_m))
+#define KS_MAR(_m)                             (0x14 - (_m))
 #define KS_MARL                                        0x10
 #define KS_MARM                                        0x12
 #define KS_MARH                                        0x14