KS8851: Fix MAC address write order

The MAC address register was being written in the wrong order, so add
a new address macro to convert mac-address byte to register address and
a ks8851_wrreg8() function to write each byte without having to worry
about any difficult byte swapping.

Fixes a bug reported by Doong, Ping of Micrel.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 34 insertions, 4 deletions

diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
index 18b17a1deb11..29fa19a076bd 100644
--- a/drivers/net/ks8851.c
+++ b/drivers/net/ks8851.c
@@ -171,6 +171,36 @@ 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)
+                ks_err(ks, "spi_sync() failed\n");
+}
+
+/**
  * ks8851_rx_1msg - select whether to use one or two messages for spi read
  * @ks: The device structure
  *
@@ -322,13 +352,12 @@ static void ks8851_soft_reset(struct ks8851_net *ks, unsigned op)
 static int ks8851_write_mac_addr(struct net_device *dev)
 {
         struct ks8851_net *ks = netdev_priv(dev);
-        u16 *mcp = (u16 *)dev->dev_addr;
+        int i;
 
         mutex_lock(&ks->lock);
 
-        ks8851_wrreg16(ks, KS_MARL, mcp[0]);
-        ks8851_wrreg16(ks, KS_MARM, mcp[1]);
-        ks8851_wrreg16(ks, KS_MARH, mcp[2]);
+        for (i = 0; i < ETH_ALEN; i++)
+                ks8851_wrreg8(ks, KS_MAR(i), dev->dev_addr[i]);
 
         mutex_unlock(&ks->lock);
 
diff --git a/drivers/net/ks8851.h b/drivers/net/ks8851.h
index 85abe147afbf..f52c312cc356 100644
--- a/drivers/net/ks8851.h
+++ b/drivers/net/ks8851.h
@@ -16,6 +16,7 @@
 #define CCR_32PIN                               (1 << 0)
 
 /* MAC address registers */
+#define KS_MAR(_m)                              0x15 - (_m)
 #define KS_MARL                                 0x10
 #define KS_MARM                                 0x12
 #define KS_MARH                                 0x14