b43: Always use block-I/O for the PIO data registers

On SDIO the PIO data register seems to be hardwired to LE. So
the MACCTL bit has no effect on the endianness.
So also use block-I/O for the last word of the packet. block-I/O is always LE.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Tested-by: Albert Herranz <albert_herranz@yahoo.es>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/pio.c

@@ -340,10 +340,15 @@ static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q,
 			q->mmio_base + B43_PIO_TXDATA,
 			sizeof(u16));
 	if (data_len & 1) {
+		u8 tail[2] = { 0, };
+
 		/* Write the last byte. */
 		ctl &= ~B43_PIO_TXCTL_WRITEHI;
 		b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
-		b43_piotx_write16(q, B43_PIO_TXDATA, data[data_len - 1]);
+		tail[0] = data[data_len - 1];
+		ssb_block_write(dev->dev, tail, 2,
+				q->mmio_base + B43_PIO_TXDATA,
+				sizeof(u16));
 	}
 
 	return ctl;
@@ -386,26 +391,31 @@ static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q,
 			q->mmio_base + B43_PIO8_TXDATA,
 			sizeof(u32));
 	if (data_len & 3) {
-		u32 value = 0;
+		u8 tail[4] = { 0, };
 
 		/* Write the last few bytes. */
 		ctl &= ~(B43_PIO8_TXCTL_8_15 | B43_PIO8_TXCTL_16_23 |
 			 B43_PIO8_TXCTL_24_31);
-		data = &(data[data_len - 1]);
 		switch (data_len & 3) {
 		case 3:
-			ctl |= B43_PIO8_TXCTL_16_23;
-			value |= (u32)(*data) << 16;
-			data--;
+			ctl |= B43_PIO8_TXCTL_16_23 | B43_PIO8_TXCTL_8_15;
+			tail[0] = data[data_len - 3];
+			tail[1] = data[data_len - 2];
+			tail[2] = data[data_len - 1];
+			break;
 		case 2:
 			ctl |= B43_PIO8_TXCTL_8_15;
-			value |= (u32)(*data) << 8;
-			data--;
+			tail[0] = data[data_len - 2];
+			tail[1] = data[data_len - 1];
+			break;
 		case 1:
-			value |= (u32)(*data);
+			tail[0] = data[data_len - 1];
+			break;
 		}
 		b43_piotx_write32(q, B43_PIO8_TXCTL, ctl);
-		b43_piotx_write32(q, B43_PIO8_TXDATA, value);
+		ssb_block_write(dev->dev, tail, 4,
+				q->mmio_base + B43_PIO8_TXDATA,
+				sizeof(u32));
 	}
 
 	return ctl;
@@ -693,21 +703,25 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
 			       q->mmio_base + B43_PIO8_RXDATA,
 			       sizeof(u32));
 		if (len & 3) {
-			u32 value;
-			char *data;
+			u8 tail[4] = { 0, };
 
 			/* Read the last few bytes. */
-			value = b43_piorx_read32(q, B43_PIO8_RXDATA);
-			data = &(skb->data[len + padding - 1]);
+			ssb_block_read(dev->dev, tail, 4,
+				       q->mmio_base + B43_PIO8_RXDATA,
+				       sizeof(u32));
 			switch (len & 3) {
 			case 3:
-				*data = (value >> 16);
-				data--;
+				skb->data[len + padding - 3] = tail[0];
+				skb->data[len + padding - 2] = tail[1];
+				skb->data[len + padding - 1] = tail[2];
+				break;
 			case 2:
-				*data = (value >> 8);
-				data--;
+				skb->data[len + padding - 2] = tail[0];
+				skb->data[len + padding - 1] = tail[1];
+				break;
 			case 1:
-				*data = value;
+				skb->data[len + padding - 1] = tail[0];
+				break;
 			}
 		}
 	} else {
@@ -715,11 +729,13 @@ static bool pio_rx_frame(struct b43_pio_rxqueue *q)
 			       q->mmio_base + B43_PIO_RXDATA,
 			       sizeof(u16));
 		if (len & 1) {
-			u16 value;
+			u8 tail[2] = { 0, };
 
 			/* Read the last byte. */
-			value = b43_piorx_read16(q, B43_PIO_RXDATA);
-			skb->data[len + padding - 1] = value;
+			ssb_block_read(dev->dev, tail, 2,
+				       q->mmio_base + B43_PIO_RXDATA,
+				       sizeof(u16));
+			skb->data[len + padding - 1] = tail[0];
 		}
 	}