b43: Add PIO support for PCMCIA devices

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Index: wireless-testing/drivers/net/wireless/b43/dma.h
===================================================================
@@ -288,7 +288,10 @@ int b43_dma_tx(struct b43_wldev *dev,
 	       struct sk_buff *skb, struct ieee80211_tx_control *ctl);
 void b43_dma_handle_txstatus(struct b43_wldev *dev,
 			     const struct b43_txstatus *status);
 
 void b43_dma_rx(struct b43_dmaring *ring);
 
+void b43_dma_direct_fifo_rx(struct b43_wldev *dev,
+			    unsigned int engine_index, bool enable);
+
 #endif /* B43_DMA_H_ */

Index: wireless-testing/drivers/net/wireless/b43/main.c
===================================================================
@@ -44,12 +44,13 @@
 
 #include "b43.h"
 #include "main.h"
 #include "debugfs.h"
 #include "phy.h"
 #include "dma.h"
+#include "pio.h"
 #include "sysfs.h"
 #include "xmit.h"
 #include "lo.h"
 #include "pcmcia.h"
 
 MODULE_DESCRIPTION("Broadcom B43 wireless driver");

@@ -1590,14 +1591,18 @@ static void b43_interrupt_tasklet(struct
 	if (reason & B43_IRQ_TXFIFO_FLUSH_OK)
 		;/* TODO */
 	if (reason & B43_IRQ_NOISESAMPLE_OK)
 		handle_irq_noise(dev);
 
 	/* Check the DMA reason registers for received data. */
-	if (dma_reason[0] & B43_DMAIRQ_RX_DONE)
-		b43_dma_rx(dev->dma.rx_ring);
+	if (dma_reason[0] & B43_DMAIRQ_RX_DONE) {
+		if (b43_using_pio_transfers(dev))
+			b43_pio_rx(dev->pio.rx_queue);
+		else
+			b43_dma_rx(dev->dma.rx_ring);
+	}
 	B43_WARN_ON(dma_reason[1] & B43_DMAIRQ_RX_DONE);
 	B43_WARN_ON(dma_reason[2] & B43_DMAIRQ_RX_DONE);
 	B43_WARN_ON(dma_reason[3] & B43_DMAIRQ_RX_DONE);
 	B43_WARN_ON(dma_reason[4] & B43_DMAIRQ_RX_DONE);
 	B43_WARN_ON(dma_reason[5] & B43_DMAIRQ_RX_DONE);
 

@@ -2695,18 +2700,27 @@ static int b43_op_tx(struct ieee80211_hw
 		     struct ieee80211_tx_control *ctl)
 {
 	struct b43_wl *wl = hw_to_b43_wl(hw);
 	struct b43_wldev *dev = wl->current_dev;
 	int err = -ENODEV;
 
+	if (unlikely(skb->len < 2 + 2 + 6)) {
+		/* Too short, this can't be a valid frame. */
+		return -EINVAL;
+	}
+	B43_WARN_ON(skb_shinfo(skb)->nr_frags);
+
 	if (unlikely(!dev))
 		goto out;
 	if (unlikely(b43_status(dev) < B43_STAT_STARTED))
 		goto out;
-	/* DMA-TX is done without a global lock. */
-	err = b43_dma_tx(dev, skb, ctl);
+	/* TX is done without a global lock. */
+	if (b43_using_pio_transfers(dev))
+		err = b43_pio_tx(dev, skb, ctl);
+	else
+		err = b43_dma_tx(dev, skb, ctl);
 out:
 	if (unlikely(err))
 		return NETDEV_TX_BUSY;
 	return NETDEV_TX_OK;
 }
 

@@ -2894,13 +2908,16 @@ static int b43_op_get_tx_stats(struct ie
 	int err = -ENODEV;
 
 	if (!dev)
 		goto out;
 	spin_lock_irqsave(&wl->irq_lock, flags);
 	if (likely(b43_status(dev) >= B43_STAT_STARTED)) {
-		b43_dma_get_tx_stats(dev, stats);
+		if (b43_using_pio_transfers(dev))
+			b43_pio_get_tx_stats(dev, stats);
+		else
+			b43_dma_get_tx_stats(dev, stats);
 		err = 0;
 	}
 	spin_unlock_irqrestore(&wl->irq_lock, flags);
 out:
 	return err;
 }

@@ -3363,12 +3380,13 @@ static void b43_wireless_core_stop(struc
 	b43_read32(dev, B43_MMIO_GEN_IRQ_MASK);	/* flush */
 	spin_unlock_irqrestore(&wl->irq_lock, flags);
 	b43_synchronize_irq(dev);
 
 	b43_set_status(dev, B43_STAT_INITIALIZED);
 
+	b43_pio_stop(dev);
 	mutex_unlock(&wl->mutex);
 	/* Must unlock as it would otherwise deadlock. No races here.
 	 * Cancel the possibly running self-rearming periodic work. */
 	cancel_delayed_work_sync(&dev->periodic_work);
 	mutex_lock(&wl->mutex);
 

@@ -3680,12 +3698,13 @@ static void b43_wireless_core_exit(struc
 
 	if (!dev->suspend_in_progress) {
 		b43_leds_exit(dev);
 		b43_rng_exit(dev->wl, false);
 	}
 	b43_dma_free(dev);
+	b43_pio_free(dev);
 	b43_chip_exit(dev);
 	b43_radio_turn_off(dev, 1);
 	b43_switch_analog(dev, 0);
 	if (phy->dyn_tssi_tbl)
 		kfree(phy->tssi2dbm);
 	kfree(phy->lo_control);

@@ -3777,13 +3796,19 @@ static int b43_wireless_core_init(struct
 	} else {
 		b43_shm_write16(dev, B43_SHM_SCRATCH, B43_SHM_SC_MINCONT, 0xF);
 	}
 	/* Maximum Contention Window */
 	b43_shm_write16(dev, B43_SHM_SCRATCH, B43_SHM_SC_MAXCONT, 0x3FF);
 
-	err = b43_dma_init(dev);
+	if ((dev->dev->bus->bustype == SSB_BUSTYPE_PCMCIA) || B43_FORCE_PIO) {
+		dev->__using_pio_transfers = 1;
+		err = b43_pio_init(dev);
+	} else {
+		dev->__using_pio_transfers = 0;
+		err = b43_dma_init(dev);
+	}
 	if (err)
 		goto err_chip_exit;
 	b43_qos_init(dev);
 
 //FIXME
 #if 1

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Index: wireless-testing/drivers/net/wireless/b43/xmit.h
===================================================================
@@ -204,24 +204,12 @@ enum {
 	B43_TXST_SUPP_CHAN,	/* Channel mismatch */
 	B43_TXST_SUPP_LIFE,	/* Lifetime expired */
 	B43_TXST_SUPP_UNDER,	/* Buffer underflow */
 	B43_TXST_SUPP_ABNACK,	/* Afterburner NACK */
 };
 
-/* Transmit Status as received through DMA/PIO on old chips */
-struct b43_hwtxstatus {
-	PAD_BYTES(4);
-	__le16 cookie;
-	u8 flags;
-	u8 count;
-	 PAD_BYTES(2);
-	__le16 seq;
-	u8 phy_stat;
-	 PAD_BYTES(1);
-} __attribute__ ((__packed__));
-
 /* Receive header for v4 firmware. */
 struct b43_rxhdr_fw4 {
 	__le16 frame_len;	/* Frame length */
 	 PAD_BYTES(2);
 	__le16 phy_status0;	/* PHY RX Status 0 */
 	__u8 jssi;		/* PHY RX Status 1: JSSI */

@@ -292,15 +280,14 @@ void b43_generate_plcp_hdr(struct b43_pl
 			   const u16 octets, const u8 bitrate);
 
 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr);
 
 void b43_handle_txstatus(struct b43_wldev *dev,
 			 const struct b43_txstatus *status);
-
-void b43_handle_hwtxstatus(struct b43_wldev *dev,
-			   const struct b43_hwtxstatus *hw);
+bool b43_fill_txstatus_report(struct ieee80211_tx_status *report,
+			      const struct b43_txstatus *status);
 
 void b43_tx_suspend(struct b43_wldev *dev);
 void b43_tx_resume(struct b43_wldev *dev);
 
 
 /* Helper functions for converting the key-table index from "firmware-format"