Subject: [PATCH TESTING] bcm43xx PIO mode

From: Michael Buesch <[email-masked]>
Date: Sat, 22 Apr 2006 17:18:53 +0200

Hi,

Here is a patch to get PIO mode working in
the bcm43xx driver for cards that support it.
Supporting cards are all the "older" ones like 4306
(Apple Airport Extreme).

Please test this patch on a little endian machine,
such as i386. This patch works on PPC, but I am
not 100% sure, if I got the endianess right.
So please someone test it for me.

I would like to get this into mainline kernel
before 2.6.17 (if it works correctly on LE), because
this could be used as a tempoary solution for
people with the >1G problem.

Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_dma.h
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_dma.h	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_dma.h	2006-04-22 16:47:51.000000000 +0200
@@ -213,6 +213,14 @@
 void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
 {
 }
+static inline
+void bcm43xx_dma_tx_suspend(struct bcm43xx_dmaring *ring)
+{
+}
+static inline
+void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring)
+{
+}
 
 #endif /* CONFIG_BCM43XX_DMA */
 #endif /* BCM43xx_DMA_H_ */
Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_pio.c	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.c	2006-04-22 16:48:23.000000000 +0200
@@ -27,6 +27,7 @@
 #include "bcm43xx_pio.h"
 #include "bcm43xx_main.h"
 #include "bcm43xx_xmit.h"
+#include "bcm43xx_power.h"
 
 #include <linux/delay.h>
 
@@ -44,10 +45,10 @@
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  octet);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI);
+				  BCM43xx_PIO_TXCTL_WRITELO);
 	} else {
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI);
+				  BCM43xx_PIO_TXCTL_WRITELO);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  octet);
 	}
@@ -103,7 +104,7 @@
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  skb->data[skb->len - 1]);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI |
+				  BCM43xx_PIO_TXCTL_WRITELO |
 				  BCM43xx_PIO_TXCTL_COMPLETE);
 	} else {
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
@@ -112,9 +113,10 @@
 }
 
 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
-			   int packetindex)
+			   struct bcm43xx_pio_txpacket *packet)
 {
 	u16 cookie = 0x0000;
+	int packetindex;
 
 	/* We use the upper 4 bits for the PIO
 	 * controller ID and the lower 12 bits
@@ -135,6 +137,7 @@
 	default:
 		assert(0);
 	}
+	packetindex = pio_txpacket_getindex(packet);
 	assert(((u16)packetindex & 0xF000) == 0x0000);
 	cookie |= (u16)packetindex;
 
@@ -184,7 +187,7 @@
 	bcm43xx_generate_txhdr(queue->bcm,
 			       &txhdr, skb->data, skb->len,
 			       (packet->xmitted_frags == 0),
-			       generate_cookie(queue, pio_txpacket_getindex(packet)));
+			       generate_cookie(queue, packet));
 
 	tx_start(queue);
 	octets = skb->len + sizeof(txhdr);
@@ -241,7 +244,7 @@
 		queue->tx_devq_packets++;
 		queue->tx_devq_used += octets;
 
-		assert(packet->xmitted_frags <= packet->txb->nr_frags);
+		assert(packet->xmitted_frags < packet->txb->nr_frags);
 		packet->xmitted_frags++;
 		packet->xmitted_octets += octets;
 	}
@@ -257,8 +260,14 @@
 	unsigned long flags;
 	struct bcm43xx_pio_txpacket *packet, *tmp_packet;
 	int err;
+	u16 txctl;
 
 	bcm43xx_lock_mmio(bcm, flags);
+
+	txctl = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
+	if (txctl & BCM43xx_PIO_TXCTL_SUSPEND)
+		return;
+
 	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 		assert(packet->xmitted_frags < packet->txb->nr_frags);
 		if (packet->xmitted_frags == 0) {
@@ -330,7 +339,7 @@
 		     (unsigned long)queue);
 
 	value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
-	value |= BCM43xx_SBF_XFER_REG_BYTESWAP;
+	value &= ~BCM43xx_SBF_XFER_REG_BYTESWAP;
 	bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
 
 	qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
@@ -444,15 +453,10 @@
 {
 	struct bcm43xx_pioqueue *queue = bcm43xx_current_pio(bcm)->queue1;
 	struct bcm43xx_pio_txpacket *packet;
-	u16 tmp;
 
 	assert(!queue->tx_suspended);
 	assert(!list_empty(&queue->txfree));
 
-	tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
-	if (tmp & BCM43xx_PIO_TXCTL_SUSPEND)
-		return -EBUSY;
-
 	packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
 	packet->txb = txb;
 	packet->xmitted_frags = 0;
@@ -462,7 +466,7 @@
 	assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
 
 	/* Suspend TX, if we are out of packets in the "free" queue. */
-	if (unlikely(list_empty(&queue->txfree))) {
+	if (list_empty(&queue->txfree)) {
 		netif_stop_queue(queue->bcm->net_dev);
 		queue->tx_suspended = 1;
 	}
@@ -480,15 +484,15 @@
 
 	queue = parse_cookie(bcm, status->cookie, &packet);
 	assert(queue);
-//TODO
-if (!queue)
-return;
+
 	free_txpacket(packet, 1);
-	if (unlikely(queue->tx_suspended)) {
+	if (queue->tx_suspended) {
 		queue->tx_suspended = 0;
 		netif_wake_queue(queue->bcm->net_dev);
 	}
-	/* If there are packets on the txqueue, poke the tasklet. */
+	/* If there are packets on the txqueue, poke the tasklet
+	 * to transmit them.
+	 */
 	if (!list_empty(&queue->txqueue))
 		tasklet_schedule(&queue->txtask);
 }
@@ -519,12 +523,9 @@
 	int i, preamble_readwords;
 	struct sk_buff *skb;
 
-return;
 	tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
-	if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE)) {
-		dprintkl(KERN_ERR PFX "PIO RX: No data available\n");//TODO: remove this printk.
+	if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE))
 		return;
-	}
 	bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
 			  BCM43xx_PIO_RXCTL_DATAAVAILABLE);
 
@@ -538,8 +539,7 @@
 	return;
 data_ready:
 
-//FIXME: endianess in this function.
-	len = le16_to_cpu(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
+	len = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 	if (unlikely(len > 0x700)) {
 		pio_rx_error(queue, 0, "len > 0x700");
 		return;
@@ -555,7 +555,7 @@
 		preamble_readwords = 18 / sizeof(u16);
 	for (i = 0; i < preamble_readwords; i++) {
 		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
-		preamble[i + 1] = cpu_to_be16(tmp);//FIXME?
+		preamble[i + 1] = cpu_to_le16(tmp);
 	}
 	rxhdr = (struct bcm43xx_rxhdr *)preamble;
 	rxflags2 = le16_to_cpu(rxhdr->flags2);
@@ -591,16 +591,40 @@
 	}
 	skb_put(skb, len);
 	for (i = 0; i < len - 1; i += 2) {
-		tmp = cpu_to_be16(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
-		*((u16 *)(skb->data + i)) = tmp;
+		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
+		*((u16 *)(skb->data + i)) = cpu_to_le16(tmp);
 	}
 	if (len % 2) {
 		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 		skb->data[len - 1] = (tmp & 0x00FF);
+/* The specs say the following is required, but
+ * it is wrong and corrupts the PLCP. If we don't do
+ * this, the PLCP seems to be correct. So ifdef it out for now.
+ */
+#if 0
 		if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
-			skb->data[0x20] = (tmp & 0xFF00) >> 8;
+			skb->data[2] = (tmp & 0xFF00) >> 8;
 		else
-			skb->data[0x1E] = (tmp & 0xFF00) >> 8;
+			skb->data[0] = (tmp & 0xFF00) >> 8;
+#endif
 	}
+	skb_trim(skb, len - IEEE80211_FCS_LEN);
 	bcm43xx_rx(queue->bcm, skb, rxhdr);
 }
+
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
+{
+	bcm43xx_power_saving_ctl_bits(queue->bcm, -1, 1);
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
+			  | BCM43xx_PIO_TXCTL_SUSPEND);
+}
+
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
+{
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
+			  & ~BCM43xx_PIO_TXCTL_SUSPEND);
+	bcm43xx_power_saving_ctl_bits(queue->bcm, -1, -1);
+	tasklet_schedule(&queue->txtask);
+}
Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.h
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_pio.h	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.h	2006-04-22 16:47:17.000000000 +0200
@@ -14,8 +14,8 @@
 #define BCM43xx_PIO_RXCTL		0x08
 #define BCM43xx_PIO_RXDATA		0x0A
 
-#define BCM43xx_PIO_TXCTL_WRITEHI	(1 << 0)
-#define BCM43xx_PIO_TXCTL_WRITELO	(1 << 1)
+#define BCM43xx_PIO_TXCTL_WRITELO	(1 << 0)
+#define BCM43xx_PIO_TXCTL_WRITEHI	(1 << 1)
 #define BCM43xx_PIO_TXCTL_COMPLETE	(1 << 2)
 #define BCM43xx_PIO_TXCTL_INIT		(1 << 3)
 #define BCM43xx_PIO_TXCTL_SUSPEND	(1 << 7)
@@ -95,6 +95,7 @@
 		       u16 offset, u16 value)
 {
 	bcm43xx_write16(queue->bcm, queue->mmio_base + offset, value);
+	mmiowb();
 }

@@ -107,6 +108,9 @@
 				   struct bcm43xx_xmitstatus *status);
 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue);
 
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue);
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue);
+
 #else /* CONFIG_BCM43XX_PIO */
 
 static inline
@@ -133,6 +137,14 @@
 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
 {
 }
+static inline
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
+{
+}
+static inline
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
+{
+}
 
 #endif /* CONFIG_BCM43XX_PIO */
 #endif /* BCM43xx_PIO_H_ */

-- 
Greetings Michael.
Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_dma.h
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_dma.h	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_dma.h	2006-04-22 16:47:51.000000000 +0200
@@ -213,6 +213,14 @@
 void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
 {
 }
+static inline
+void bcm43xx_dma_tx_suspend(struct bcm43xx_dmaring *ring)
+{
+}
+static inline
+void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring)
+{
+}
 
 #endif /* CONFIG_BCM43XX_DMA */
 #endif /* BCM43xx_DMA_H_ */
Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_pio.c	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.c	2006-04-22 16:48:23.000000000 +0200
@@ -27,6 +27,7 @@
 #include "bcm43xx_pio.h"
 #include "bcm43xx_main.h"
 #include "bcm43xx_xmit.h"
+#include "bcm43xx_power.h"
 
 #include <linux/delay.h>
 
@@ -44,10 +45,10 @@
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  octet);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI);
+				  BCM43xx_PIO_TXCTL_WRITELO);
 	} else {
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI);
+				  BCM43xx_PIO_TXCTL_WRITELO);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  octet);
 	}
@@ -103,7 +104,7 @@
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
 				  skb->data[skb->len - 1]);
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
-				  BCM43xx_PIO_TXCTL_WRITEHI |
+				  BCM43xx_PIO_TXCTL_WRITELO |
 				  BCM43xx_PIO_TXCTL_COMPLETE);
 	} else {
 		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
@@ -112,9 +113,10 @@
 }
 
 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
-			   int packetindex)
+			   struct bcm43xx_pio_txpacket *packet)
 {
 	u16 cookie = 0x0000;
+	int packetindex;
 
 	/* We use the upper 4 bits for the PIO
 	 * controller ID and the lower 12 bits
@@ -135,6 +137,7 @@
 	default:
 		assert(0);
 	}
+	packetindex = pio_txpacket_getindex(packet);
 	assert(((u16)packetindex & 0xF000) == 0x0000);
 	cookie |= (u16)packetindex;
 
@@ -184,7 +187,7 @@
 	bcm43xx_generate_txhdr(queue->bcm,
 			       &txhdr, skb->data, skb->len,
 			       (packet->xmitted_frags == 0),
-			       generate_cookie(queue, pio_txpacket_getindex(packet)));
+			       generate_cookie(queue, packet));
 
 	tx_start(queue);
 	octets = skb->len + sizeof(txhdr);
@@ -241,7 +244,7 @@
 		queue->tx_devq_packets++;
 		queue->tx_devq_used += octets;
 
-		assert(packet->xmitted_frags <= packet->txb->nr_frags);
+		assert(packet->xmitted_frags < packet->txb->nr_frags);
 		packet->xmitted_frags++;
 		packet->xmitted_octets += octets;
 	}
@@ -257,8 +260,14 @@
 	unsigned long flags;
 	struct bcm43xx_pio_txpacket *packet, *tmp_packet;
 	int err;
+	u16 txctl;
 
 	bcm43xx_lock_mmio(bcm, flags);
+
+	txctl = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
+	if (txctl & BCM43xx_PIO_TXCTL_SUSPEND)
+		return;
+
 	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 		assert(packet->xmitted_frags < packet->txb->nr_frags);
 		if (packet->xmitted_frags == 0) {
@@ -330,7 +339,7 @@
 		     (unsigned long)queue);
 
 	value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
-	value |= BCM43xx_SBF_XFER_REG_BYTESWAP;
+	value &= ~BCM43xx_SBF_XFER_REG_BYTESWAP;
 	bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
 
 	qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
@@ -444,15 +453,10 @@
 {
 	struct bcm43xx_pioqueue *queue = bcm43xx_current_pio(bcm)->queue1;
 	struct bcm43xx_pio_txpacket *packet;
-	u16 tmp;
 
 	assert(!queue->tx_suspended);
 	assert(!list_empty(&queue->txfree));
 
-	tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
-	if (tmp & BCM43xx_PIO_TXCTL_SUSPEND)
-		return -EBUSY;
-
 	packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
 	packet->txb = txb;
 	packet->xmitted_frags = 0;
@@ -462,7 +466,7 @@
 	assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
 
 	/* Suspend TX, if we are out of packets in the "free" queue. */
-	if (unlikely(list_empty(&queue->txfree))) {
+	if (list_empty(&queue->txfree)) {
 		netif_stop_queue(queue->bcm->net_dev);
 		queue->tx_suspended = 1;
 	}
@@ -480,15 +484,15 @@
 
 	queue = parse_cookie(bcm, status->cookie, &packet);
 	assert(queue);
-//TODO
-if (!queue)
-return;
+
 	free_txpacket(packet, 1);
-	if (unlikely(queue->tx_suspended)) {
+	if (queue->tx_suspended) {
 		queue->tx_suspended = 0;
 		netif_wake_queue(queue->bcm->net_dev);
 	}
-	/* If there are packets on the txqueue, poke the tasklet. */
+	/* If there are packets on the txqueue, poke the tasklet
+	 * to transmit them.
+	 */
 	if (!list_empty(&queue->txqueue))
 		tasklet_schedule(&queue->txtask);
 }
@@ -519,12 +523,9 @@
 	int i, preamble_readwords;
 	struct sk_buff *skb;
 
-return;
 	tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
-	if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE)) {
-		dprintkl(KERN_ERR PFX "PIO RX: No data available\n");//TODO: remove this printk.
+	if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE))
 		return;
-	}
 	bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
 			  BCM43xx_PIO_RXCTL_DATAAVAILABLE);
 
@@ -538,8 +539,7 @@
 	return;
 data_ready:
 
-//FIXME: endianess in this function.
-	len = le16_to_cpu(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
+	len = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 	if (unlikely(len > 0x700)) {
 		pio_rx_error(queue, 0, "len > 0x700");
 		return;
@@ -555,7 +555,7 @@
 		preamble_readwords = 18 / sizeof(u16);
 	for (i = 0; i < preamble_readwords; i++) {
 		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
-		preamble[i + 1] = cpu_to_be16(tmp);//FIXME?
+		preamble[i + 1] = cpu_to_le16(tmp);
 	}
 	rxhdr = (struct bcm43xx_rxhdr *)preamble;
 	rxflags2 = le16_to_cpu(rxhdr->flags2);
@@ -591,16 +591,40 @@
 	}
 	skb_put(skb, len);
 	for (i = 0; i < len - 1; i += 2) {
-		tmp = cpu_to_be16(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
-		*((u16 *)(skb->data + i)) = tmp;
+		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
+		*((u16 *)(skb->data + i)) = cpu_to_le16(tmp);
 	}
 	if (len % 2) {
 		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
 		skb->data[len - 1] = (tmp & 0x00FF);
+/* The specs say the following is required, but
+ * it is wrong and corrupts the PLCP. If we don't do
+ * this, the PLCP seems to be correct. So ifdef it out for now.
+ */
+#if 0
 		if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
-			skb->data[0x20] = (tmp & 0xFF00) >> 8;
+			skb->data[2] = (tmp & 0xFF00) >> 8;
 		else
-			skb->data[0x1E] = (tmp & 0xFF00) >> 8;
+			skb->data[0] = (tmp & 0xFF00) >> 8;
+#endif
 	}
+	skb_trim(skb, len - IEEE80211_FCS_LEN);
 	bcm43xx_rx(queue->bcm, skb, rxhdr);
 }
+
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
+{
+	bcm43xx_power_saving_ctl_bits(queue->bcm, -1, 1);
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
+			  | BCM43xx_PIO_TXCTL_SUSPEND);
+}
+
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
+{
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
+			  & ~BCM43xx_PIO_TXCTL_SUSPEND);
+	bcm43xx_power_saving_ctl_bits(queue->bcm, -1, -1);
+	tasklet_schedule(&queue->txtask);
+}
Index: wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.h
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/bcm43xx/bcm43xx_pio.h	2006-04-11 06:26:46.000000000 +0200
+++ wireless-2.6/drivers/net/wireless/bcm43xx/bcm43xx_pio.h	2006-04-22 16:47:17.000000000 +0200
@@ -14,8 +14,8 @@
 #define BCM43xx_PIO_RXCTL		0x08
 #define BCM43xx_PIO_RXDATA		0x0A
 
-#define BCM43xx_PIO_TXCTL_WRITEHI	(1 << 0)
-#define BCM43xx_PIO_TXCTL_WRITELO	(1 << 1)
+#define BCM43xx_PIO_TXCTL_WRITELO	(1 << 0)
+#define BCM43xx_PIO_TXCTL_WRITEHI	(1 << 1)
 #define BCM43xx_PIO_TXCTL_COMPLETE	(1 << 2)
 #define BCM43xx_PIO_TXCTL_INIT		(1 << 3)
 #define BCM43xx_PIO_TXCTL_SUSPEND	(1 << 7)
@@ -95,6 +95,7 @@
 		       u16 offset, u16 value)
 {
 	bcm43xx_write16(queue->bcm, queue->mmio_base + offset, value);
+	mmiowb();
 }

@@ -107,6 +108,9 @@
 				   struct bcm43xx_xmitstatus *status);
 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue);
 
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue);
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue);
+
 #else /* CONFIG_BCM43XX_PIO */
 
 static inline
@@ -133,6 +137,14 @@
 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
 {
 }
+static inline
+void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
+{
+}
+static inline
+void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
+{
+}
 
 #endif /* CONFIG_BCM43XX_PIO */
 #endif /* BCM43xx_PIO_H_ */