1 files changed, 606 insertions, 0 deletions

diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_pio.c b/drivers/net/wireless/bcm43xx/bcm43xx_pio.c
new file mode 100644
index 000000000000..c59ddd40680d
--- /dev/null
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_pio.c
@@ -0,0 +1,606 @@
+/*
+
+  Broadcom BCM43xx wireless driver
+
+  PIO Transmission
+
+  Copyright (c) 2005 Michael Buesch <mbuesch@freenet.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; see the file COPYING.  If not, write to
+  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+
+*/
+
+#include "bcm43xx.h"
+#include "bcm43xx_pio.h"
+#include "bcm43xx_main.h"
+#include "bcm43xx_xmit.h"
+
+#include <linux/delay.h>
+
+
+static void tx_start(struct bcm43xx_pioqueue *queue)
+{
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  BCM43xx_PIO_TXCTL_INIT);
+}
+
+static void tx_octet(struct bcm43xx_pioqueue *queue,
+		     u8 octet)
+{
+	if (queue->need_workarounds) {
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
+				  octet);
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+				  BCM43xx_PIO_TXCTL_WRITEHI);
+	} else {
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+				  BCM43xx_PIO_TXCTL_WRITEHI);
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
+				  octet);
+	}
+}
+
+static u16 tx_get_next_word(struct bcm43xx_txhdr *txhdr,
+			    const u8 *packet,
+			    unsigned int *pos)
+{
+	const u8 *source;
+	unsigned int i = *pos;
+	u16 ret;
+
+	if (i < sizeof(*txhdr)) {
+		source = (const u8 *)txhdr;
+	} else {
+		source = packet;
+		i -= sizeof(*txhdr);
+	}
+	ret = le16_to_cpu( *((u16 *)(source + i)) );
+	*pos += 2;
+
+	return ret;
+}
+
+static void tx_data(struct bcm43xx_pioqueue *queue,
+		    struct bcm43xx_txhdr *txhdr,
+		    const u8 *packet,
+		    unsigned int octets)
+{
+	u16 data;
+	unsigned int i = 0;
+
+	if (queue->need_workarounds) {
+		data = tx_get_next_word(txhdr, packet, &i);
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
+	}
+	bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+			  BCM43xx_PIO_TXCTL_WRITELO |
+			  BCM43xx_PIO_TXCTL_WRITEHI);
+	while (i < octets - 1) {
+		data = tx_get_next_word(txhdr, packet, &i);
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
+	}
+	if (octets % 2)
+		tx_octet(queue, packet[octets - sizeof(*txhdr) - 1]);
+}
+
+static void tx_complete(struct bcm43xx_pioqueue *queue,
+			struct sk_buff *skb)
+{
+	if (queue->need_workarounds) {
+		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_COMPLETE);
+	} else {
+		bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
+				  BCM43xx_PIO_TXCTL_COMPLETE);
+	}
+}
+
+static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
+			   int packetindex)
+{
+	u16 cookie = 0x0000;
+
+	/* We use the upper 4 bits for the PIO
+	 * controller ID and the lower 12 bits
+	 * for the packet index (in the cache).
+	 */
+	switch (queue->mmio_base) {
+	case BCM43xx_MMIO_PIO1_BASE:
+		break;
+	case BCM43xx_MMIO_PIO2_BASE:
+		cookie = 0x1000;
+		break;
+	case BCM43xx_MMIO_PIO3_BASE:
+		cookie = 0x2000;
+		break;
+	case BCM43xx_MMIO_PIO4_BASE:
+		cookie = 0x3000;
+		break;
+	default:
+		assert(0);
+	}
+	assert(((u16)packetindex & 0xF000) == 0x0000);
+	cookie |= (u16)packetindex;
+
+	return cookie;
+}
+
+static
+struct bcm43xx_pioqueue * parse_cookie(struct bcm43xx_private *bcm,
+				       u16 cookie,
+				       struct bcm43xx_pio_txpacket **packet)
+{
+	struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
+	struct bcm43xx_pioqueue *queue = NULL;
+	int packetindex;
+
+	switch (cookie & 0xF000) {
+	case 0x0000:
+		queue = pio->queue0;
+		break;
+	case 0x1000:
+		queue = pio->queue1;
+		break;
+	case 0x2000:
+		queue = pio->queue2;
+		break;
+	case 0x3000:
+		queue = pio->queue3;
+		break;
+	default:
+		assert(0);
+	}
+	packetindex = (cookie & 0x0FFF);
+	assert(packetindex >= 0 && packetindex < BCM43xx_PIO_MAXTXPACKETS);
+	*packet = &(queue->tx_packets_cache[packetindex]);
+
+	return queue;
+}
+
+static void pio_tx_write_fragment(struct bcm43xx_pioqueue *queue,
+				  struct sk_buff *skb,
+				  struct bcm43xx_pio_txpacket *packet)
+{
+	struct bcm43xx_txhdr txhdr;
+	unsigned int octets;
+
+	assert(skb_shinfo(skb)->nr_frags == 0);
+	bcm43xx_generate_txhdr(queue->bcm,
+			       &txhdr, skb->data, skb->len,
+			       (packet->xmitted_frags == 0),
+			       generate_cookie(queue, pio_txpacket_getindex(packet)));
+
+	tx_start(queue);
+	octets = skb->len + sizeof(txhdr);
+	if (queue->need_workarounds)
+		octets--;
+	tx_data(queue, &txhdr, (u8 *)skb->data, octets);
+	tx_complete(queue, skb);
+}
+
+static void free_txpacket(struct bcm43xx_pio_txpacket *packet,
+			  int irq_context)
+{
+	struct bcm43xx_pioqueue *queue = packet->queue;
+
+	ieee80211_txb_free(packet->txb);
+	list_move(&packet->list, &queue->txfree);
+	queue->nr_txfree++;
+
+	assert(queue->tx_devq_used >= packet->xmitted_octets);
+	assert(queue->tx_devq_packets >= packet->xmitted_frags);
+	queue->tx_devq_used -= packet->xmitted_octets;
+	queue->tx_devq_packets -= packet->xmitted_frags;
+}
+
+static int pio_tx_packet(struct bcm43xx_pio_txpacket *packet)
+{
+	struct bcm43xx_pioqueue *queue = packet->queue;
+	struct ieee80211_txb *txb = packet->txb;
+	struct sk_buff *skb;
+	u16 octets;
+	int i;
+
+	for (i = packet->xmitted_frags; i < txb->nr_frags; i++) {
+		skb = txb->fragments[i];
+
+		octets = (u16)skb->len + sizeof(struct bcm43xx_txhdr);
+		assert(queue->tx_devq_size >= octets);
+		assert(queue->tx_devq_packets <= BCM43xx_PIO_MAXTXDEVQPACKETS);
+		assert(queue->tx_devq_used <= queue->tx_devq_size);
+		/* Check if there is sufficient free space on the device
+		 * TX queue. If not, return and let the TX tasklet
+		 * retry later.
+		 */
+		if (queue->tx_devq_packets == BCM43xx_PIO_MAXTXDEVQPACKETS)
+			return -EBUSY;
+		if (queue->tx_devq_used + octets > queue->tx_devq_size)
+			return -EBUSY;
+		/* Now poke the device. */
+		pio_tx_write_fragment(queue, skb, packet);
+
+		/* Account for the packet size.
+		 * (We must not overflow the device TX queue)
+		 */
+		queue->tx_devq_packets++;
+		queue->tx_devq_used += octets;
+
+		assert(packet->xmitted_frags <= packet->txb->nr_frags);
+		packet->xmitted_frags++;
+		packet->xmitted_octets += octets;
+	}
+	list_move_tail(&packet->list, &queue->txrunning);
+
+	return 0;
+}
+
+static void tx_tasklet(unsigned long d)
+{
+	struct bcm43xx_pioqueue *queue = (struct bcm43xx_pioqueue *)d;
+	struct bcm43xx_private *bcm = queue->bcm;
+	unsigned long flags;
+	struct bcm43xx_pio_txpacket *packet, *tmp_packet;
+	int err;
+
+	bcm43xx_lock_mmio(bcm, flags);
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
+		assert(packet->xmitted_frags < packet->txb->nr_frags);
+		if (packet->xmitted_frags == 0) {
+			int i;
+			struct sk_buff *skb;
+
+			/* Check if the device queue is big
+			 * enough for every fragment. If not, drop the
+			 * whole packet.
+			 */
+			for (i = 0; i < packet->txb->nr_frags; i++) {
+				skb = packet->txb->fragments[i];
+				if (unlikely(skb->len > queue->tx_devq_size)) {
+					dprintkl(KERN_ERR PFX "PIO TX device queue too small. "
+							      "Dropping packet.\n");
+					free_txpacket(packet, 1);
+					goto next_packet;
+				}
+			}
+		}
+		/* Try to transmit the packet.
+		 * This may not completely succeed.
+		 */
+		err = pio_tx_packet(packet);
+		if (err)
+			break;
+	next_packet:
+		continue;
+	}
+	bcm43xx_unlock_mmio(bcm, flags);
+}
+
+static void setup_txqueues(struct bcm43xx_pioqueue *queue)
+{
+	struct bcm43xx_pio_txpacket *packet;
+	int i;
+
+	queue->nr_txfree = BCM43xx_PIO_MAXTXPACKETS;
+	for (i = 0; i < BCM43xx_PIO_MAXTXPACKETS; i++) {
+		packet = &(queue->tx_packets_cache[i]);
+
+		packet->queue = queue;
+		INIT_LIST_HEAD(&packet->list);
+
+		list_add(&packet->list, &queue->txfree);
+	}
+}
+
+static
+struct bcm43xx_pioqueue * bcm43xx_setup_pioqueue(struct bcm43xx_private *bcm,
+						 u16 pio_mmio_base)
+{
+	struct bcm43xx_pioqueue *queue;
+	u32 value;
+	u16 qsize;
+
+	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+	if (!queue)
+		goto out;
+
+	queue->bcm = bcm;
+	queue->mmio_base = pio_mmio_base;
+	queue->need_workarounds = (bcm->current_core->rev < 3);
+
+	INIT_LIST_HEAD(&queue->txfree);
+	INIT_LIST_HEAD(&queue->txqueue);
+	INIT_LIST_HEAD(&queue->txrunning);
+	tasklet_init(&queue->txtask, tx_tasklet,
+		     (unsigned long)queue);
+
+	value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
+	value |= BCM43xx_SBF_XFER_REG_BYTESWAP;
+	bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
+
+	qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
+	if (qsize <= BCM43xx_PIO_TXQADJUST) {
+		printk(KERN_ERR PFX "PIO tx device-queue too small (%u)\n", qsize);
+		goto err_freequeue;
+	}
+	qsize -= BCM43xx_PIO_TXQADJUST;
+	queue->tx_devq_size = qsize;
+
+	setup_txqueues(queue);
+
+out:
+	return queue;
+
+err_freequeue:
+	kfree(queue);
+	queue = NULL;
+	goto out;
+}
+
+static void cancel_transfers(struct bcm43xx_pioqueue *queue)
+{
+	struct bcm43xx_pio_txpacket *packet, *tmp_packet;
+
+	netif_tx_disable(queue->bcm->net_dev);
+	assert(queue->bcm->shutting_down);
+	tasklet_disable(&queue->txtask);
+
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
+		free_txpacket(packet, 0);
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
+		free_txpacket(packet, 0);
+}
+
+static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue *queue)
+{
+	if (!queue)
+		return;
+
+	cancel_transfers(queue);
+	kfree(queue);
+}
+
+void bcm43xx_pio_free(struct bcm43xx_private *bcm)
+{
+	struct bcm43xx_pio *pio;
+
+	if (!bcm43xx_using_pio(bcm))
+		return;
+	pio = bcm43xx_current_pio(bcm);
+
+	bcm43xx_destroy_pioqueue(pio->queue3);
+	pio->queue3 = NULL;
+	bcm43xx_destroy_pioqueue(pio->queue2);
+	pio->queue2 = NULL;
+	bcm43xx_destroy_pioqueue(pio->queue1);
+	pio->queue1 = NULL;
+	bcm43xx_destroy_pioqueue(pio->queue0);
+	pio->queue0 = NULL;
+}
+
+int bcm43xx_pio_init(struct bcm43xx_private *bcm)
+{
+	struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
+	struct bcm43xx_pioqueue *queue;
+	int err = -ENOMEM;
+
+	queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO1_BASE);
+	if (!queue)
+		goto out;
+	pio->queue0 = queue;
+
+	queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO2_BASE);
+	if (!queue)
+		goto err_destroy0;
+	pio->queue1 = queue;
+
+	queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO3_BASE);
+	if (!queue)
+		goto err_destroy1;
+	pio->queue2 = queue;
+
+	queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO4_BASE);
+	if (!queue)
+		goto err_destroy2;
+	pio->queue3 = queue;
+
+	if (bcm->current_core->rev < 3)
+		bcm->irq_savedstate |= BCM43xx_IRQ_PIO_WORKAROUND;
+
+	dprintk(KERN_INFO PFX "PIO initialized\n");
+	err = 0;
+out:
+	return err;
+
+err_destroy2:
+	bcm43xx_destroy_pioqueue(pio->queue2);
+	pio->queue2 = NULL;
+err_destroy1:
+	bcm43xx_destroy_pioqueue(pio->queue1);
+	pio->queue1 = NULL;
+err_destroy0:
+	bcm43xx_destroy_pioqueue(pio->queue0);
+	pio->queue0 = NULL;
+	goto out;
+}
+
+int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
+		   struct ieee80211_txb *txb)
+{
+	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;
+	packet->xmitted_octets = 0;
+	list_move_tail(&packet->list, &queue->txqueue);
+	queue->nr_txfree--;
+	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))) {
+		netif_stop_queue(queue->bcm->net_dev);
+		queue->tx_suspended = 1;
+	}
+
+	tasklet_schedule(&queue->txtask);
+
+	return 0;
+}
+
+void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
+				   struct bcm43xx_xmitstatus *status)
+{
+	struct bcm43xx_pioqueue *queue;
+	struct bcm43xx_pio_txpacket *packet;
+
+	queue = parse_cookie(bcm, status->cookie, &packet);
+	assert(queue);
+//TODO
+if (!queue)
+return;
+	free_txpacket(packet, 1);
+	if (unlikely(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 (!list_empty(&queue->txqueue))
+		tasklet_schedule(&queue->txtask);
+}
+
+static void pio_rx_error(struct bcm43xx_pioqueue *queue,
+			 int clear_buffers,
+			 const char *error)
+{
+	int i;
+
+	printkl("PIO RX error: %s\n", error);
+	bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
+			  BCM43xx_PIO_RXCTL_READY);
+	if (clear_buffers) {
+		assert(queue->mmio_base == BCM43xx_MMIO_PIO1_BASE);
+		for (i = 0; i < 15; i++) {
+			/* Dummy read. */
+			bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
+		}
+	}
+}
+
+void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
+{
+	u16 preamble[21] = { 0 };
+	struct bcm43xx_rxhdr *rxhdr;
+	u16 tmp, len, rxflags2;
+	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.
+		return;
+	}
+	bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
+			  BCM43xx_PIO_RXCTL_DATAAVAILABLE);
+
+	for (i = 0; i < 10; i++) {
+		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
+		if (tmp & BCM43xx_PIO_RXCTL_READY)
+			goto data_ready;
+		udelay(10);
+	}
+	dprintkl(KERN_ERR PFX "PIO RX timed out\n");
+	return;
+data_ready:
+
+//FIXME: endianess in this function.
+	len = le16_to_cpu(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
+	if (unlikely(len > 0x700)) {
+		pio_rx_error(queue, 0, "len > 0x700");
+		return;
+	}
+	if (unlikely(len == 0 && queue->mmio_base != BCM43xx_MMIO_PIO4_BASE)) {
+		pio_rx_error(queue, 0, "len == 0");
+		return;
+	}
+	preamble[0] = cpu_to_le16(len);
+	if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE)
+		preamble_readwords = 14 / sizeof(u16);
+	else
+		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?
+	}
+	rxhdr = (struct bcm43xx_rxhdr *)preamble;
+	rxflags2 = le16_to_cpu(rxhdr->flags2);
+	if (unlikely(rxflags2 & BCM43xx_RXHDR_FLAGS2_INVALIDFRAME)) {
+		pio_rx_error(queue,
+			     (queue->mmio_base == BCM43xx_MMIO_PIO1_BASE),
+			     "invalid frame");
+		return;
+	}
+	if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE) {
+		/* We received an xmit status. */
+		struct bcm43xx_hwxmitstatus *hw;
+		struct bcm43xx_xmitstatus stat;
+
+		hw = (struct bcm43xx_hwxmitstatus *)(preamble + 1);
+		stat.cookie = le16_to_cpu(hw->cookie);
+		stat.flags = hw->flags;
+		stat.cnt1 = hw->cnt1;
+		stat.cnt2 = hw->cnt2;
+		stat.seq = le16_to_cpu(hw->seq);
+		stat.unknown = le16_to_cpu(hw->unknown);
+
+		bcm43xx_debugfs_log_txstat(queue->bcm, &stat);
+		bcm43xx_pio_handle_xmitstatus(queue->bcm, &stat);
+
+		return;
+	}
+
+	skb = dev_alloc_skb(len);
+	if (unlikely(!skb)) {
+		pio_rx_error(queue, 1, "OOM");
+		return;
+	}
+	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;
+	}
+	if (len % 2) {
+		tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
+		skb->data[len - 1] = (tmp & 0x00FF);
+		if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
+			skb->data[0x20] = (tmp & 0xFF00) >> 8;
+		else
+			skb->data[0x1E] = (tmp & 0xFF00) >> 8;
+	}
+	bcm43xx_rx(queue->bcm, skb, rxhdr);
+}