-/*
-
- 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(*((__le16 *)(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;
- u16 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 = packet->index;
- 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);
- packet->index = i;
-
- 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)
-{
- __le16 preamble[21] = { 0 };
- struct b43_rxhdr_fw4 *rxhdr;
- u16 tmp, len;
- u32 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 = le32_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);
- *((__le16 *)(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);
-}
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