2 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index eb7db032a780..5113b26fc2d9 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -47,6 +47,7 @@
 #include <linux/bitops.h>
 #include <linux/irq.h>
 #include <linux/io.h>
+#include <linux/swab.h>
 #include <linux/phy.h>
 #include <linux/smsc911x.h>
 #include "smsc911x.h"
@@ -175,6 +176,12 @@ static inline void
 smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
                       unsigned int wordcount)
 {
+        if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
+                while (wordcount--)
+                        smsc911x_reg_write(pdata, TX_DATA_FIFO, swab32(*buf++));
+                return;
+        }
+
         if (pdata->config.flags & SMSC911X_USE_32BIT) {
                 writesl(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
                 return;
@@ -194,6 +201,12 @@ static inline void
 smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
                      unsigned int wordcount)
 {
+        if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
+                while (wordcount--)
+                        *buf++ = swab32(smsc911x_reg_read(pdata, RX_DATA_FIFO));
+                return;
+        }
+
         if (pdata->config.flags & SMSC911X_USE_32BIT) {
                 readsl(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
                 return;
diff --git a/include/linux/smsc911x.h b/include/linux/smsc911x.h
index b32725075d71..5241e4fb4eca 100644
--- a/include/linux/smsc911x.h
+++ b/include/linux/smsc911x.h
@@ -47,4 +47,14 @@ struct smsc911x_platform_config {
 #define SMSC911X_FORCE_EXTERNAL_PHY             (BIT(3))
 #define SMSC911X_SAVE_MAC_ADDRESS               (BIT(4))
 
+/*
+ * SMSC911X_SWAP_FIFO:
+ * Enables software byte swap for fifo data. Should only be used as a
+ * "last resort" in the case of big endian mode on boards with incorrectly
+ * routed data bus to older devices such as LAN9118. Newer devices such as
+ * LAN9221 can handle this in hardware, there are registers to control
+ * this swapping but the driver doesn't currently use them.
+ */
+#define SMSC911X_SWAP_FIFO                      (BIT(5))
+
 #endif /* __LINUX_SMSC911X_H__ */