--- /dev/null
+/*
+
+ Broadcom B43 wireless driver
+
+ PIO Transmission
+
+ Copyright (c) 2005 Michael Buesch <mb@bu3sch.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 "b43.h"
+#include "pio.h"
+#include "main.h"
+#include "xmit.h"
+
+#include <linux/delay.h>
+
+static void tx_start(struct b43_pioqueue *queue)
+{
+ b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_INIT);
+}
+
+static void tx_octet(struct b43_pioqueue *queue, u8 octet)
+{
+ if (queue->need_workarounds) {
+ b43_pio_write(queue, B43_PIO_TXDATA, octet);
+ b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_WRITELO);
+ } else {
+ b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_WRITELO);
+ b43_pio_write(queue, B43_PIO_TXDATA, octet);
+ }
+}
+
+static u16 tx_get_next_word(const u8 * txhdr,
+ const u8 * packet,
+ size_t txhdr_size, unsigned int *pos)
+{
+ const u8 *source;
+ unsigned int i = *pos;
+ u16 ret;
+
+ if (i < txhdr_size) {
+ source = txhdr;
+ } else {
+ source = packet;
+ i -= txhdr_size;
+ }
+ ret = le16_to_cpu(*((u16 *) (source + i)));
+ *pos += 2;
+
+ return ret;
+}
+
+static void tx_data(struct b43_pioqueue *queue,
+ u8 * txhdr, const u8 * packet, unsigned int octets)
+{
+ u16 data;
+ unsigned int i = 0;
+
+ if (queue->need_workarounds) {
+ data = tx_get_next_word(txhdr, packet,
+ sizeof(struct b43_txhdr_fw4), &i);
+ b43_pio_write(queue, B43_PIO_TXDATA, data);
+ }
+ b43_pio_write(queue, B43_PIO_TXCTL,
+ B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_WRITEHI);
+ while (i < octets - 1) {
+ data = tx_get_next_word(txhdr, packet,
+ sizeof(struct b43_txhdr_fw4), &i);
+ b43_pio_write(queue, B43_PIO_TXDATA, data);
+ }
+ if (octets % 2)
+ tx_octet(queue,
+ packet[octets - sizeof(struct b43_txhdr_fw4) - 1]);
+}
+
+static void tx_complete(struct b43_pioqueue *queue, struct sk_buff *skb)
+{
+ if (queue->need_workarounds) {
+ b43_pio_write(queue, B43_PIO_TXDATA, skb->data[skb->len - 1]);
+ b43_pio_write(queue, B43_PIO_TXCTL,
+ B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_COMPLETE);
+ } else {
+ b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_COMPLETE);
+ }
+}
+
+static u16 generate_cookie(struct b43_pioqueue *queue,
+ struct b43_pio_txpacket *packet)
+{
+ u16 cookie = 0x0000;
+ int packetindex;
+
+ /* 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 B43_MMIO_PIO1_BASE:
+ break;
+ case B43_MMIO_PIO2_BASE:
+ cookie = 0x1000;
+ break;
+ case B43_MMIO_PIO3_BASE:
+ cookie = 0x2000;
+ break;
+ case B43_MMIO_PIO4_BASE:
+ cookie = 0x3000;
+ break;
+ default:
+ B43_WARN_ON(1);
+ }
+ packetindex = pio_txpacket_getindex(packet);
+ B43_WARN_ON(packetindex & ~0x0FFF);
+ cookie |= (u16) packetindex;
+
+ return cookie;
+}
+
+static
+struct b43_pioqueue *parse_cookie(struct b43_wldev *dev,
+ u16 cookie, struct b43_pio_txpacket **packet)
+{
+ struct b43_pio *pio = &dev->pio;
+ struct b43_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:
+ B43_WARN_ON(1);
+ }
+ packetindex = (cookie & 0x0FFF);
+ B43_WARN_ON(!(packetindex >= 0 && packetindex < B43_PIO_MAXTXPACKETS));
+ *packet = &(queue->tx_packets_cache[packetindex]);
+
+ return queue;
+}
+
+union txhdr_union {
+ struct b43_txhdr_fw4 txhdr_fw4;
+};
+
+static void pio_tx_write_fragment(struct b43_pioqueue *queue,
+ struct sk_buff *skb,
+ struct b43_pio_txpacket *packet,
+ size_t txhdr_size)
+{
+ union txhdr_union txhdr_data;
+ u8 *txhdr = NULL;
+ unsigned int octets;
+
+ txhdr = (u8 *) (&txhdr_data.txhdr_fw4);
+
+ B43_WARN_ON(skb_shinfo(skb)->nr_frags);
+ b43_generate_txhdr(queue->dev,
+ txhdr, skb->data, skb->len,
+ &packet->txstat.control,
+ generate_cookie(queue, packet));
+
+ tx_start(queue);
+ octets = skb->len + txhdr_size;
+ if (queue->need_workarounds)
+ octets--;
+ tx_data(queue, txhdr, (u8 *) skb->data, octets);
+ tx_complete(queue, skb);
+}
+
+static void free_txpacket(struct b43_pio_txpacket *packet)
+{
+ struct b43_pioqueue *queue = packet->queue;
+
+ if (packet->skb)
+ dev_kfree_skb_any(packet->skb);
+ list_move(&packet->list, &queue->txfree);
+ queue->nr_txfree++;
+}
+
+static int pio_tx_packet(struct b43_pio_txpacket *packet)
+{
+ struct b43_pioqueue *queue = packet->queue;
+ struct sk_buff *skb = packet->skb;
+ u16 octets;
+
+ octets = (u16) skb->len + sizeof(struct b43_txhdr_fw4);
+ if (queue->tx_devq_size < octets) {
+ b43warn(queue->dev->wl, "PIO queue too small. "
+ "Dropping packet.\n");
+ /* Drop it silently (return success) */
+ free_txpacket(packet);
+ return 0;
+ }
+ B43_WARN_ON(queue->tx_devq_packets > B43_PIO_MAXTXDEVQPACKETS);
+ B43_WARN_ON(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 == B43_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, sizeof(struct b43_txhdr_fw4));
+
+ /* Account for the packet size.
+ * (We must not overflow the device TX queue)
+ */
+ queue->tx_devq_packets++;
+ queue->tx_devq_used += octets;
+
+ /* Transmission started, everything ok, move the
+ * packet to the txrunning list.
+ */
+ list_move_tail(&packet->list, &queue->txrunning);
+
+ return 0;
+}
+
+static void tx_tasklet(unsigned long d)
+{
+ struct b43_pioqueue *queue = (struct b43_pioqueue *)d;
+ struct b43_wldev *dev = queue->dev;
+ unsigned long flags;
+ struct b43_pio_txpacket *packet, *tmp_packet;
+ int err;
+ u16 txctl;
+
+ spin_lock_irqsave(&dev->wl->irq_lock, flags);
+ if (queue->tx_frozen)
+ goto out_unlock;
+ txctl = b43_pio_read(queue, B43_PIO_TXCTL);
+ if (txctl & B43_PIO_TXCTL_SUSPEND)
+ goto out_unlock;
+
+ list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
+ /* Try to transmit the packet. This can fail, if
+ * the device queue is full. In case of failure, the
+ * packet is left in the txqueue.
+ * If transmission succeed, the packet is moved to txrunning.
+ * If it is impossible to transmit the packet, it
+ * is dropped.
+ */
+ err = pio_tx_packet(packet);
+ if (err)
+ break;
+ }
+ out_unlock:
+ spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
+}
+
+static void setup_txqueues(struct b43_pioqueue *queue)
+{
+ struct b43_pio_txpacket *packet;
+ int i;
+
+ queue->nr_txfree = B43_PIO_MAXTXPACKETS;
+ for (i = 0; i < B43_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 b43_pioqueue *b43_setup_pioqueue(struct b43_wldev *dev,
+ u16 pio_mmio_base)
+{
+ struct b43_pioqueue *queue;
+ u16 qsize;
+
+ queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+ if (!queue)
+ goto out;
+
+ queue->dev = dev;
+ queue->mmio_base = pio_mmio_base;
+ queue->need_workarounds = (dev->dev->id.revision < 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);
+
+ b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
+ & ~B43_MACCTL_BE);
+
+ qsize = b43_read16(dev, queue->mmio_base + B43_PIO_TXQBUFSIZE);
+ if (qsize == 0) {
+ b43err(dev->wl, "This card does not support PIO "
+ "operation mode. Please use DMA mode "
+ "(module parameter pio=0).\n");
+ goto err_freequeue;
+ }
+ if (qsize <= B43_PIO_TXQADJUST) {
+ b43err(dev->wl, "PIO tx device-queue too small (%u)\n", qsize);
+ goto err_freequeue;
+ }
+ qsize -= B43_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 b43_pioqueue *queue)
+{
+ struct b43_pio_txpacket *packet, *tmp_packet;
+
+ tasklet_disable(&queue->txtask);
+
+ list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
+ free_txpacket(packet);
+ list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
+ free_txpacket(packet);
+}
+
+static void b43_destroy_pioqueue(struct b43_pioqueue *queue)
+{
+ if (!queue)
+ return;
+
+ cancel_transfers(queue);
+ kfree(queue);
+}
+
+void b43_pio_free(struct b43_wldev *dev)
+{
+ struct b43_pio *pio;
+
+ if (!b43_using_pio(dev))
+ return;
+ pio = &dev->pio;
+
+ b43_destroy_pioqueue(pio->queue3);
+ pio->queue3 = NULL;
+ b43_destroy_pioqueue(pio->queue2);
+ pio->queue2 = NULL;
+ b43_destroy_pioqueue(pio->queue1);
+ pio->queue1 = NULL;
+ b43_destroy_pioqueue(pio->queue0);
+ pio->queue0 = NULL;
+}
+
+int b43_pio_init(struct b43_wldev *dev)
+{
+ struct b43_pio *pio = &dev->pio;
+ struct b43_pioqueue *queue;
+ int err = -ENOMEM;
+
+ queue = b43_setup_pioqueue(dev, B43_MMIO_PIO1_BASE);
+ if (!queue)
+ goto out;
+ pio->queue0 = queue;
+
+ queue = b43_setup_pioqueue(dev, B43_MMIO_PIO2_BASE);
+ if (!queue)
+ goto err_destroy0;
+ pio->queue1 = queue;
+
+ queue = b43_setup_pioqueue(dev, B43_MMIO_PIO3_BASE);
+ if (!queue)
+ goto err_destroy1;
+ pio->queue2 = queue;
+
+ queue = b43_setup_pioqueue(dev, B43_MMIO_PIO4_BASE);
+ if (!queue)
+ goto err_destroy2;
+ pio->queue3 = queue;
+
+ if (dev->dev->id.revision < 3)
+ dev->irq_savedstate |= B43_IRQ_PIO_WORKAROUND;
+
+ b43dbg(dev->wl, "PIO initialized\n");
+ err = 0;
+ out:
+ return err;
+
+ err_destroy2:
+ b43_destroy_pioqueue(pio->queue2);
+ pio->queue2 = NULL;
+ err_destroy1:
+ b43_destroy_pioqueue(pio->queue1);
+ pio->queue1 = NULL;
+ err_destroy0:
+ b43_destroy_pioqueue(pio->queue0);
+ pio->queue0 = NULL;
+ goto out;
+}
+
+int b43_pio_tx(struct b43_wldev *dev,
+ struct sk_buff *skb, struct ieee80211_tx_control *ctl)
+{
+ struct b43_pioqueue *queue = dev->pio.queue1;
+ struct b43_pio_txpacket *packet;
+
+ B43_WARN_ON(queue->tx_suspended);
+ B43_WARN_ON(list_empty(&queue->txfree));
+
+ packet = list_entry(queue->txfree.next, struct b43_pio_txpacket, list);
+ packet->skb = skb;
+
+ memset(&packet->txstat, 0, sizeof(packet->txstat));
+ memcpy(&packet->txstat.control, ctl, sizeof(*ctl));
+
+ list_move_tail(&packet->list, &queue->txqueue);
+ queue->nr_txfree--;
+ queue->nr_tx_packets++;
+ B43_WARN_ON(queue->nr_txfree >= B43_PIO_MAXTXPACKETS);
+
+ tasklet_schedule(&queue->txtask);
+
+ return 0;
+}
+
+void b43_pio_handle_txstatus(struct b43_wldev *dev,
+ const struct b43_txstatus *status)
+{
+ struct b43_pioqueue *queue;
+ struct b43_pio_txpacket *packet;
+
+ queue = parse_cookie(dev, status->cookie, &packet);
+ if (B43_WARN_ON(!queue))
+ return;
+
+ queue->tx_devq_packets--;
+ queue->tx_devq_used -=
+ (packet->skb->len + sizeof(struct b43_txhdr_fw4));
+
+ if (status->acked) {
+ packet->txstat.flags |= IEEE80211_TX_STATUS_ACK;
+ } else {
+ if (!(packet->txstat.control.flags & IEEE80211_TXCTL_NO_ACK))
+ packet->txstat.excessive_retries = 1;
+ }
+ if (status->frame_count == 0) {
+ /* The frame was not transmitted at all. */
+ packet->txstat.retry_count = 0;
+ } else
+ packet->txstat.retry_count = status->frame_count - 1;
+ ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb,
+ &(packet->txstat));
+ packet->skb = NULL;
+
+ free_txpacket(packet);
+ /* If there are packets on the txqueue, poke the tasklet
+ * to transmit them.
+ */
+ if (!list_empty(&queue->txqueue))
+ tasklet_schedule(&queue->txtask);
+}
+
+void b43_pio_get_tx_stats(struct b43_wldev *dev,
+ struct ieee80211_tx_queue_stats *stats)
+{
+ struct b43_pio *pio = &dev->pio;
+ struct b43_pioqueue *queue;
+ struct ieee80211_tx_queue_stats_data *data;
+
+ queue = pio->queue1;
+ data = &(stats->data[0]);
+ data->len = B43_PIO_MAXTXPACKETS - queue->nr_txfree;
+ data->limit = B43_PIO_MAXTXPACKETS;
+ data->count = queue->nr_tx_packets;
+}
+
+static void pio_rx_error(struct b43_pioqueue *queue,
+ int clear_buffers, const char *error)
+{
+ int i;
+
+ b43err(queue->dev->wl, "PIO RX error: %s\n", error);
+ b43_pio_write(queue, B43_PIO_RXCTL, B43_PIO_RXCTL_READY);
+ if (clear_buffers) {
+ B43_WARN_ON(queue->mmio_base != B43_MMIO_PIO1_BASE);
+ for (i = 0; i < 15; i++) {
+ /* Dummy read. */
+ b43_pio_read(queue, B43_PIO_RXDATA);
+ }
+ }
+}
+
+void b43_pio_rx(struct b43_pioqueue *queue)
+{
+ u16 preamble[21] = { 0 };
+ struct b43_rxhdr_fw4 *rxhdr;
+ u16 tmp, len, macstat;
+ int i, preamble_readwords;
+ struct sk_buff *skb;
+
+ tmp = b43_pio_read(queue, B43_PIO_RXCTL);
+ if (!(tmp & B43_PIO_RXCTL_DATAAVAILABLE))
+ return;
+ b43_pio_write(queue, B43_PIO_RXCTL, B43_PIO_RXCTL_DATAAVAILABLE);
+
+ for (i = 0; i < 10; i++) {
+ tmp = b43_pio_read(queue, B43_PIO_RXCTL);
+ if (tmp & B43_PIO_RXCTL_READY)
+ goto data_ready;
+ udelay(10);
+ }
+ b43dbg(queue->dev->wl, "PIO RX timed out\n");
+ return;
+ data_ready:
+
+ len = b43_pio_read(queue, B43_PIO_RXDATA);
+ if (unlikely(len > 0x700)) {
+ pio_rx_error(queue, 0, "len > 0x700");
+ return;
+ }
+ if (unlikely(len == 0 && queue->mmio_base != B43_MMIO_PIO4_BASE)) {
+ pio_rx_error(queue, 0, "len == 0");
+ return;
+ }
+ preamble[0] = cpu_to_le16(len);
+ if (queue->mmio_base == B43_MMIO_PIO4_BASE)
+ preamble_readwords = 14 / sizeof(u16);
+ else
+ preamble_readwords = 18 / sizeof(u16);
+ for (i = 0; i < preamble_readwords; i++) {
+ tmp = b43_pio_read(queue, B43_PIO_RXDATA);
+ preamble[i + 1] = cpu_to_le16(tmp);
+ }
+ rxhdr = (struct b43_rxhdr_fw4 *)preamble;
+ macstat = le16_to_cpu(rxhdr->mac_status);
+ if (macstat & B43_RX_MAC_FCSERR) {
+ pio_rx_error(queue,
+ (queue->mmio_base == B43_MMIO_PIO1_BASE),
+ "Frame FCS error");
+ return;
+ }
+ if (queue->mmio_base == B43_MMIO_PIO4_BASE) {
+ /* We received an xmit status. */
+ struct b43_hwtxstatus *hw;
+
+ hw = (struct b43_hwtxstatus *)(preamble + 1);
+ b43_handle_hwtxstatus(queue->dev, hw);
+
+ 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 = b43_pio_read(queue, B43_PIO_RXDATA);
+ *((u16 *) (skb->data + i)) = cpu_to_le16(tmp);
+ }
+ if (len % 2) {
+ tmp = b43_pio_read(queue, B43_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 & B43_RXHDR_FLAGS2_TYPE2FRAME)
+ skb->data[2] = (tmp & 0xFF00) >> 8;
+ else
+ skb->data[0] = (tmp & 0xFF00) >> 8;
+#endif
+ }
+ b43_rx(queue->dev, skb, rxhdr);
+}
+
+void b43_pio_tx_suspend(struct b43_pioqueue *queue)
+{
+ b43_power_saving_ctl_bits(queue->dev, B43_PS_AWAKE);
+ b43_pio_write(queue, B43_PIO_TXCTL, b43_pio_read(queue, B43_PIO_TXCTL)
+ | B43_PIO_TXCTL_SUSPEND);
+}
+
+void b43_pio_tx_resume(struct b43_pioqueue *queue)
+{
+ b43_pio_write(queue, B43_PIO_TXCTL, b43_pio_read(queue, B43_PIO_TXCTL)
+ & ~B43_PIO_TXCTL_SUSPEND);
+ b43_power_saving_ctl_bits(queue->dev, 0);
+ tasklet_schedule(&queue->txtask);
+}
+
+void b43_pio_freeze_txqueues(struct b43_wldev *dev)
+{
+ struct b43_pio *pio;
+
+ B43_WARN_ON(!b43_using_pio(dev));
+ pio = &dev->pio;
+ pio->queue0->tx_frozen = 1;
+ pio->queue1->tx_frozen = 1;
+ pio->queue2->tx_frozen = 1;
+ pio->queue3->tx_frozen = 1;
+}
+
+void b43_pio_thaw_txqueues(struct b43_wldev *dev)
+{
+ struct b43_pio *pio;
+
+ B43_WARN_ON(!b43_using_pio(dev));
+ pio = &dev->pio;
+ pio->queue0->tx_frozen = 0;
+ pio->queue1->tx_frozen = 0;
+ pio->queue2->tx_frozen = 0;
+ pio->queue3->tx_frozen = 0;
+ if (!list_empty(&pio->queue0->txqueue))
+ tasklet_schedule(&pio->queue0->txtask);
+ if (!list_empty(&pio->queue1->txqueue))
+ tasklet_schedule(&pio->queue1->txtask);
+ if (!list_empty(&pio->queue2->txqueue))
+ tasklet_schedule(&pio->queue2->txtask);
+ if (!list_empty(&pio->queue3->txqueue))
+ tasklet_schedule(&pio->queue3->txtask);
+}
projects / openwrt.git / blobdiff