-/*
-
- Broadcom B43 wireless driver
-
- PIO data transfer
-
- Copyright (c) 2005-2008 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 "dma.h"
-#include "main.h"
-#include "xmit.h"
-
-#include <linux/delay.h>
-
-
-static void b43_pio_rx_work(struct work_struct *work);
-
-
-static u16 generate_cookie(struct b43_pio_txqueue *q,
- struct b43_pio_txpacket *pack)
-{
- u16 cookie;
-
- /* Use the upper 4 bits of the cookie as
- * PIO controller ID and store the packet index number
- * in the lower 12 bits.
- * Note that the cookie must never be 0, as this
- * is a special value used in RX path.
- * It can also not be 0xFFFF because that is special
- * for multicast frames.
- */
- cookie = (((u16)q->index + 1) << 12);
- cookie |= pack->index;
-
- return cookie;
-}
-
-static
-struct b43_pio_txqueue * parse_cookie(struct b43_wldev *dev,
- u16 cookie,
- struct b43_pio_txpacket **pack)
-{
- struct b43_pio *pio = &dev->pio;
- struct b43_pio_txqueue *q = NULL;
- unsigned int pack_index;
-
- switch (cookie & 0xF000) {
- case 0x1000:
- q = pio->tx_queue_AC_BK;
- break;
- case 0x2000:
- q = pio->tx_queue_AC_BE;
- break;
- case 0x3000:
- q = pio->tx_queue_AC_VI;
- break;
- case 0x4000:
- q = pio->tx_queue_AC_VO;
- break;
- case 0x5000:
- q = pio->tx_queue_mcast;
- break;
- }
- if (B43_WARN_ON(!q))
- return NULL;
- pack_index = (cookie & 0x0FFF);
- if (B43_WARN_ON(pack_index >= ARRAY_SIZE(q->packets)))
- return NULL;
- *pack = &q->packets[pack_index];
-
- return q;
-}
-
-static u16 index_to_pioqueue_base(struct b43_wldev *dev,
- unsigned int index)
-{
- static const u16 bases[] = {
- B43_MMIO_PIO_BASE0,
- B43_MMIO_PIO_BASE1,
- B43_MMIO_PIO_BASE2,
- B43_MMIO_PIO_BASE3,
- B43_MMIO_PIO_BASE4,
- B43_MMIO_PIO_BASE5,
- B43_MMIO_PIO_BASE6,
- B43_MMIO_PIO_BASE7,
- };
- static const u16 bases_rev11[] = {
- B43_MMIO_PIO11_BASE0,
- B43_MMIO_PIO11_BASE1,
- B43_MMIO_PIO11_BASE2,
- B43_MMIO_PIO11_BASE3,
- B43_MMIO_PIO11_BASE4,
- B43_MMIO_PIO11_BASE5,
- };
-
- if (dev->dev->id.revision >= 11) {
- B43_WARN_ON(index >= ARRAY_SIZE(bases_rev11));
- return bases_rev11[index];
- }
- B43_WARN_ON(index >= ARRAY_SIZE(bases));
- return bases[index];
-}
-
-static u16 pio_txqueue_offset(struct b43_wldev *dev)
-{
- if (dev->dev->id.revision >= 11)
- return 0x18;
- return 0;
-}
-
-static u16 pio_rxqueue_offset(struct b43_wldev *dev)
-{
- if (dev->dev->id.revision >= 11)
- return 0x38;
- return 8;
-}
-
-static struct b43_pio_txqueue * b43_setup_pioqueue_tx(struct b43_wldev *dev,
- unsigned int index)
-{
- struct b43_pio_txqueue *q;
- struct b43_pio_txpacket *p;
- unsigned int i;
-
- q = kzalloc(sizeof(*q), GFP_KERNEL);
- if (!q)
- return NULL;
- spin_lock_init(&q->lock);
- q->dev = dev;
- q->rev = dev->dev->id.revision;
- q->mmio_base = index_to_pioqueue_base(dev, index) +
- pio_txqueue_offset(dev);
- q->index = index;
-
- q->free_packet_slots = B43_PIO_MAX_NR_TXPACKETS;
- if (q->rev >= 8) {
- q->buffer_size = 1920; //FIXME this constant is wrong.
- } else {
- q->buffer_size = b43_piotx_read16(q, B43_PIO_TXQBUFSIZE);
- q->buffer_size -= 80;
- }
-
- INIT_LIST_HEAD(&q->packets_list);
- for (i = 0; i < ARRAY_SIZE(q->packets); i++) {
- p = &(q->packets[i]);
- INIT_LIST_HEAD(&p->list);
- p->index = i;
- p->queue = q;
- list_add(&p->list, &q->packets_list);
- }
-
- return q;
-}
-
-static struct b43_pio_rxqueue * b43_setup_pioqueue_rx(struct b43_wldev *dev,
- unsigned int index)
-{
- struct b43_pio_rxqueue *q;
-
- q = kzalloc(sizeof(*q), GFP_KERNEL);
- if (!q)
- return NULL;
- spin_lock_init(&q->lock);
- q->dev = dev;
- q->rev = dev->dev->id.revision;
- q->mmio_base = index_to_pioqueue_base(dev, index) +
- pio_rxqueue_offset(dev);
- INIT_WORK(&q->rx_work, b43_pio_rx_work);
-
- /* Enable Direct FIFO RX (PIO) on the engine. */
- b43_dma_direct_fifo_rx(dev, index, 1);
-
- return q;
-}
-
-static void b43_pio_cancel_tx_packets(struct b43_pio_txqueue *q)
-{
- struct b43_pio_txpacket *pack;
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(q->packets); i++) {
- pack = &(q->packets[i]);
- if (pack->skb) {
- dev_kfree_skb_any(pack->skb);
- pack->skb = NULL;
- }
- }
-}
-
-static void b43_destroy_pioqueue_tx(struct b43_pio_txqueue *q,
- const char *name)
-{
- if (!q)
- return;
- b43_pio_cancel_tx_packets(q);
- kfree(q);
-}
-
-static void b43_destroy_pioqueue_rx(struct b43_pio_rxqueue *q,
- const char *name)
-{
- if (!q)
- return;
- kfree(q);
-}
-
-#define destroy_queue_tx(pio, queue) do { \
- b43_destroy_pioqueue_tx((pio)->queue, __stringify(queue)); \
- (pio)->queue = NULL; \
- } while (0)
-
-#define destroy_queue_rx(pio, queue) do { \
- b43_destroy_pioqueue_rx((pio)->queue, __stringify(queue)); \
- (pio)->queue = NULL; \
- } while (0)
-
-void b43_pio_free(struct b43_wldev *dev)
-{
- struct b43_pio *pio;
-
- if (!b43_using_pio_transfers(dev))
- return;
- pio = &dev->pio;
-
- destroy_queue_rx(pio, rx_queue);
- destroy_queue_tx(pio, tx_queue_mcast);
- destroy_queue_tx(pio, tx_queue_AC_VO);
- destroy_queue_tx(pio, tx_queue_AC_VI);
- destroy_queue_tx(pio, tx_queue_AC_BE);
- destroy_queue_tx(pio, tx_queue_AC_BK);
-}
-
-void b43_pio_stop(struct b43_wldev *dev)
-{
- if (!b43_using_pio_transfers(dev))
- return;
- cancel_work_sync(&dev->pio.rx_queue->rx_work);
-}
-
-int b43_pio_init(struct b43_wldev *dev)
-{
- struct b43_pio *pio = &dev->pio;
- int err = -ENOMEM;
-
- b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
- & ~B43_MACCTL_BE);
- b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_RXPADOFF, 0);
-
- pio->tx_queue_AC_BK = b43_setup_pioqueue_tx(dev, 0);
- if (!pio->tx_queue_AC_BK)
- goto out;
-
- pio->tx_queue_AC_BE = b43_setup_pioqueue_tx(dev, 1);
- if (!pio->tx_queue_AC_BE)
- goto err_destroy_bk;
-
- pio->tx_queue_AC_VI = b43_setup_pioqueue_tx(dev, 2);
- if (!pio->tx_queue_AC_VI)
- goto err_destroy_be;
-
- pio->tx_queue_AC_VO = b43_setup_pioqueue_tx(dev, 3);
- if (!pio->tx_queue_AC_VO)
- goto err_destroy_vi;
-
- pio->tx_queue_mcast = b43_setup_pioqueue_tx(dev, 4);
- if (!pio->tx_queue_mcast)
- goto err_destroy_vo;
-
- pio->rx_queue = b43_setup_pioqueue_rx(dev, 0);
- if (!pio->rx_queue)
- goto err_destroy_mcast;
-
- b43dbg(dev->wl, "PIO initialized\n");
- err = 0;
-out:
- return err;
-
-err_destroy_mcast:
- destroy_queue_tx(pio, tx_queue_mcast);
-err_destroy_vo:
- destroy_queue_tx(pio, tx_queue_AC_VO);
-err_destroy_vi:
- destroy_queue_tx(pio, tx_queue_AC_VI);
-err_destroy_be:
- destroy_queue_tx(pio, tx_queue_AC_BE);
-err_destroy_bk:
- destroy_queue_tx(pio, tx_queue_AC_BK);
- return err;
-}
-
-/* Static mapping of mac80211's queues (priorities) to b43 PIO queues. */
-static struct b43_pio_txqueue * select_queue_by_priority(struct b43_wldev *dev,
- u8 queue_prio)
-{
- struct b43_pio_txqueue *q;
-
- if (b43_modparam_qos) {
- /* 0 = highest priority */
- switch (queue_prio) {
- default:
- B43_WARN_ON(1);
- /* fallthrough */
- case 0:
- q = dev->pio.tx_queue_AC_VO;
- break;
- case 1:
- q = dev->pio.tx_queue_AC_VI;
- break;
- case 2:
- q = dev->pio.tx_queue_AC_BE;
- break;
- case 3:
- q = dev->pio.tx_queue_AC_BK;
- break;
- }
- } else
- q = dev->pio.tx_queue_AC_BE;
-
- return q;
-}
-
-static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q,
- u16 ctl,
- const void *_data,
- unsigned int data_len)
-{
- struct b43_wldev *dev = q->dev;
- const u8 *data = _data;
-
- ctl |= B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_WRITEHI;
- b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
-
- ssb_block_write(dev->dev, data, (data_len & ~1),
- q->mmio_base + B43_PIO_TXDATA,
- sizeof(u16));
- if (data_len & 1) {
- /* Write the last byte. */
- ctl &= ~B43_PIO_TXCTL_WRITEHI;
- b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
- b43_piotx_write16(q, B43_PIO_TXDATA, data[data_len - 1]);
- }
-
- return ctl;
-}
-
-static void pio_tx_frame_2byte_queue(struct b43_pio_txpacket *pack,
- const u8 *hdr, unsigned int hdrlen)
-{
- struct b43_pio_txqueue *q = pack->queue;
- const char *frame = pack->skb->data;
- unsigned int frame_len = pack->skb->len;
- u16 ctl;
-
- ctl = b43_piotx_read16(q, B43_PIO_TXCTL);
- ctl |= B43_PIO_TXCTL_FREADY;
- ctl &= ~B43_PIO_TXCTL_EOF;
-
- /* Transfer the header data. */
- ctl = tx_write_2byte_queue(q, ctl, hdr, hdrlen);
- /* Transfer the frame data. */
- ctl = tx_write_2byte_queue(q, ctl, frame, frame_len);
-
- ctl |= B43_PIO_TXCTL_EOF;
- b43_piotx_write16(q, B43_PIO_TXCTL, ctl);
-}
-
-static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q,
- u32 ctl,
- const void *_data,
- unsigned int data_len)
-{
- struct b43_wldev *dev = q->dev;
- const u8 *data = _data;
-
- ctl |= B43_PIO8_TXCTL_0_7 | B43_PIO8_TXCTL_8_15 |
- B43_PIO8_TXCTL_16_23 | B43_PIO8_TXCTL_24_31;
- b43_piotx_write32(q, B43_PIO8_TXCTL, ctl);
-
- ssb_block_write(dev->dev, data, (data_len & ~3),
- q->mmio_base + B43_PIO8_TXDATA,
- sizeof(u32));
- if (data_len & 3) {
- u32 value = 0;
-
- /* Write the last few bytes. */
- ctl &= ~(B43_PIO8_TXCTL_8_15 | B43_PIO8_TXCTL_16_23 |
- B43_PIO8_TXCTL_24_31);
- data = &(data[data_len - 1]);
- switch (data_len & 3) {
- case 3:
- ctl |= B43_PIO8_TXCTL_16_23;
- value |= (u32)(*data) << 16;
- data--;
- case 2:
- ctl |= B43_PIO8_TXCTL_8_15;
- value |= (u32)(*data) << 8;
- data--;
- case 1:
- value |= (u32)(*data);
- }
- b43_piotx_write32(q, B43_PIO8_TXCTL, ctl);
- b43_piotx_write32(q, B43_PIO8_TXDATA, value);
- }
-
- return ctl;
-}
-
-static void pio_tx_frame_4byte_queue(struct b43_pio_txpacket *pack,
- const u8 *hdr, unsigned int hdrlen)
-{
- struct b43_pio_txqueue *q = pack->queue;
- const char *frame = pack->skb->data;
- unsigned int frame_len = pack->skb->len;
- u32 ctl;
-
- ctl = b43_piotx_read32(q, B43_PIO8_TXCTL);
- ctl |= B43_PIO8_TXCTL_FREADY;
- ctl &= ~B43_PIO8_TXCTL_EOF;
-
- /* Transfer the header data. */
- ctl = tx_write_4byte_queue(q, ctl, hdr, hdrlen);
- /* Transfer the frame data. */
- ctl = tx_write_4byte_queue(q, ctl, frame, frame_len);
-
- ctl |= B43_PIO8_TXCTL_EOF;
- b43_piotx_write32(q, B43_PIO_TXCTL, ctl);
-}
-
-static int pio_tx_frame(struct b43_pio_txqueue *q,
- struct sk_buff *skb)
-{
- struct b43_pio_txpacket *pack;
- struct b43_txhdr txhdr;
- u16 cookie;
- int err;
- unsigned int hdrlen;
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-
- B43_WARN_ON(list_empty(&q->packets_list));
- pack = list_entry(q->packets_list.next,
- struct b43_pio_txpacket, list);
-
- cookie = generate_cookie(q, pack);
- hdrlen = b43_txhdr_size(q->dev);
- err = b43_generate_txhdr(q->dev, (u8 *)&txhdr, skb->data,
- skb->len, info, cookie);
- if (err)
- return err;
-
- if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
- /* Tell the firmware about the cookie of the last
- * mcast frame, so it can clear the more-data bit in it. */
- b43_shm_write16(q->dev, B43_SHM_SHARED,
- B43_SHM_SH_MCASTCOOKIE, cookie);
- }
-
- pack->skb = skb;
- if (q->rev >= 8)
- pio_tx_frame_4byte_queue(pack, (const u8 *)&txhdr, hdrlen);
- else
- pio_tx_frame_2byte_queue(pack, (const u8 *)&txhdr, hdrlen);
-
- /* Remove it from the list of available packet slots.
- * It will be put back when we receive the status report. */
- list_del(&pack->list);
-
- /* Update the queue statistics. */
- q->buffer_used += roundup(skb->len + hdrlen, 4);
- q->free_packet_slots -= 1;
-
- return 0;
-}
-
-int b43_pio_tx(struct b43_wldev *dev, struct sk_buff *skb)
-{
- struct b43_pio_txqueue *q;
- struct ieee80211_hdr *hdr;
- unsigned long flags;
- unsigned int hdrlen, total_len;
- int err = 0;
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-
- hdr = (struct ieee80211_hdr *)skb->data;
-
- if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
- /* The multicast queue will be sent after the DTIM. */
- q = dev->pio.tx_queue_mcast;
- /* Set the frame More-Data bit. Ucode will clear it
- * for us on the last frame. */
- hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
- } else {
- /* Decide by priority where to put this frame. */
- q = select_queue_by_priority(dev, skb_get_queue_mapping(skb));
- }
-
- spin_lock_irqsave(&q->lock, flags);
-
- hdrlen = b43_txhdr_size(dev);
- total_len = roundup(skb->len + hdrlen, 4);
-
- if (unlikely(total_len > q->buffer_size)) {
- err = -ENOBUFS;
- b43dbg(dev->wl, "PIO: TX packet longer than queue.\n");
- goto out_unlock;
- }
- if (unlikely(q->free_packet_slots == 0)) {
- err = -ENOBUFS;
- b43warn(dev->wl, "PIO: TX packet overflow.\n");
- goto out_unlock;
- }
- B43_WARN_ON(q->buffer_used > q->buffer_size);
-
- if (total_len > (q->buffer_size - q->buffer_used)) {
- /* Not enough memory on the queue. */
- err = -EBUSY;
- ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
- q->stopped = 1;
- goto out_unlock;
- }
-
- /* Assign the queue number to the ring (if not already done before)
- * so TX status handling can use it. The mac80211-queue to b43-queue
- * mapping is static, so we don't need to store it per frame. */
- q->queue_prio = skb_get_queue_mapping(skb);
-
- err = pio_tx_frame(q, skb);
- if (unlikely(err == -ENOKEY)) {
- /* Drop this packet, as we don't have the encryption key
- * anymore and must not transmit it unencrypted. */
- dev_kfree_skb_any(skb);
- err = 0;
- goto out_unlock;
- }
- if (unlikely(err)) {
- b43err(dev->wl, "PIO transmission failure\n");
- goto out_unlock;
- }
- q->nr_tx_packets++;
-
- B43_WARN_ON(q->buffer_used > q->buffer_size);
- if (((q->buffer_size - q->buffer_used) < roundup(2 + 2 + 6, 4)) ||
- (q->free_packet_slots == 0)) {
- /* The queue is full. */
- ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
- q->stopped = 1;
- }
-
-out_unlock:
- spin_unlock_irqrestore(&q->lock, flags);
-
- return err;
-}
-
-/* Called with IRQs disabled. */
-void b43_pio_handle_txstatus(struct b43_wldev *dev,
- const struct b43_txstatus *status)
-{
- struct b43_pio_txqueue *q;
- struct b43_pio_txpacket *pack = NULL;
- unsigned int total_len;
- struct ieee80211_tx_info *info;
-
- q = parse_cookie(dev, status->cookie, &pack);
- if (unlikely(!q))
- return;
- B43_WARN_ON(!pack);
-
- spin_lock(&q->lock); /* IRQs are already disabled. */
-
- info = (void *)pack->skb;
- memset(&info->status, 0, sizeof(info->status));
-
- b43_fill_txstatus_report(info, status);
-
- total_len = pack->skb->len + b43_txhdr_size(dev);
- total_len = roundup(total_len, 4);
- q->buffer_used -= total_len;
- q->free_packet_slots += 1;
-
- ieee80211_tx_status_irqsafe(dev->wl->hw, pack->skb);
- pack->skb = NULL;
- list_add(&pack->list, &q->packets_list);
-
- if (q->stopped) {
- ieee80211_wake_queue(dev->wl->hw, q->queue_prio);
- q->stopped = 0;
- }
-
- spin_unlock(&q->lock);
-}
-
-void b43_pio_get_tx_stats(struct b43_wldev *dev,
- struct ieee80211_tx_queue_stats *stats)
-{
- const int nr_queues = dev->wl->hw->queues;
- struct b43_pio_txqueue *q;
- unsigned long flags;
- int i;
-
- for (i = 0; i < nr_queues; i++) {
- q = select_queue_by_priority(dev, i);
-
- spin_lock_irqsave(&q->lock, flags);
- stats[i].len = B43_PIO_MAX_NR_TXPACKETS - q->free_packet_slots;
- stats[i].limit = B43_PIO_MAX_NR_TXPACKETS;
- stats[i].count = q->nr_tx_packets;
- spin_unlock_irqrestore(&q->lock, flags);
- }
-}
-
-/* Returns whether we should fetch another frame. */
-static bool pio_rx_frame(struct b43_pio_rxqueue *q)
-{
- struct b43_wldev *dev = q->dev;
- struct b43_rxhdr_fw4 rxhdr;
- u16 len;
- u32 macstat;
- unsigned int i, padding;
- struct sk_buff *skb;
- const char *err_msg = NULL;
-
- memset(&rxhdr, 0, sizeof(rxhdr));
-
- /* Check if we have data and wait for it to get ready. */
- if (q->rev >= 8) {
- u32 ctl;
-
- ctl = b43_piorx_read32(q, B43_PIO8_RXCTL);
- if (!(ctl & B43_PIO8_RXCTL_FRAMERDY))
- return 0;
- b43_piorx_write32(q, B43_PIO8_RXCTL,
- B43_PIO8_RXCTL_FRAMERDY);
- for (i = 0; i < 10; i++) {
- ctl = b43_piorx_read32(q, B43_PIO8_RXCTL);
- if (ctl & B43_PIO8_RXCTL_DATARDY)
- goto data_ready;
- udelay(10);
- }
- } else {
- u16 ctl;
-
- ctl = b43_piorx_read16(q, B43_PIO_RXCTL);
- if (!(ctl & B43_PIO_RXCTL_FRAMERDY))
- return 0;
- b43_piorx_write16(q, B43_PIO_RXCTL,
- B43_PIO_RXCTL_FRAMERDY);
- for (i = 0; i < 10; i++) {
- ctl = b43_piorx_read16(q, B43_PIO_RXCTL);
- if (ctl & B43_PIO_RXCTL_DATARDY)
- goto data_ready;
- udelay(10);
- }
- }
- b43dbg(q->dev->wl, "PIO RX timed out\n");
- return 1;
-data_ready:
-
- /* Get the preamble (RX header) */
- if (q->rev >= 8) {
- ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr),
- q->mmio_base + B43_PIO8_RXDATA,
- sizeof(u32));
- } else {
- ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr),
- q->mmio_base + B43_PIO_RXDATA,
- sizeof(u16));
- }
- /* Sanity checks. */
- len = le16_to_cpu(rxhdr.frame_len);
- if (unlikely(len > 0x700)) {
- err_msg = "len > 0x700";
- goto rx_error;
- }
- if (unlikely(len == 0)) {
- err_msg = "len == 0";
- goto rx_error;
- }
-
- macstat = le32_to_cpu(rxhdr.mac_status);
- if (macstat & B43_RX_MAC_FCSERR) {
- if (!(q->dev->wl->filter_flags & FIF_FCSFAIL)) {
- /* Drop frames with failed FCS. */
- err_msg = "Frame FCS error";
- goto rx_error;
- }
- }
-
- /* We always pad 2 bytes, as that's what upstream code expects
- * due to the RX-header being 30 bytes. In case the frame is
- * unaligned, we pad another 2 bytes. */
- padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
- skb = dev_alloc_skb(len + padding + 2);
- if (unlikely(!skb)) {
- err_msg = "Out of memory";
- goto rx_error;
- }
- skb_reserve(skb, 2);
- skb_put(skb, len + padding);
- if (q->rev >= 8) {
- ssb_block_read(dev->dev, skb->data + padding, (len & ~3),
- q->mmio_base + B43_PIO8_RXDATA,
- sizeof(u32));
- if (len & 3) {
- u32 value;
- char *data;
-
- /* Read the last few bytes. */
- value = b43_piorx_read32(q, B43_PIO8_RXDATA);
- data = &(skb->data[len + padding - 1]);
- switch (len & 3) {
- case 3:
- *data = (value >> 16);
- data--;
- case 2:
- *data = (value >> 8);
- data--;
- case 1:
- *data = value;
- }
- }
- } else {
- ssb_block_read(dev->dev, skb->data + padding, (len & ~1),
- q->mmio_base + B43_PIO_RXDATA,
- sizeof(u16));
- if (len & 1) {
- u16 value;
-
- /* Read the last byte. */
- value = b43_piorx_read16(q, B43_PIO_RXDATA);
- skb->data[len + padding - 1] = value;
- }
- }
-
- b43_rx(q->dev, skb, &rxhdr);
-
- return 1;
-
-rx_error:
- if (err_msg)
- b43dbg(q->dev->wl, "PIO RX error: %s\n", err_msg);
- b43_piorx_write16(q, B43_PIO_RXCTL, B43_PIO_RXCTL_DATARDY);
- return 1;
-}
-
-/* RX workqueue. We can sleep, yay! */
-static void b43_pio_rx_work(struct work_struct *work)
-{
- struct b43_pio_rxqueue *q = container_of(work, struct b43_pio_rxqueue,
- rx_work);
- unsigned int budget = 50;
- bool stop;
-
- do {
- spin_lock_irq(&q->lock);
- stop = (pio_rx_frame(q) == 0);
- spin_unlock_irq(&q->lock);
- cond_resched();
- if (stop)
- break;
- } while (--budget);
-}
-
-/* Called with IRQs disabled. */
-void b43_pio_rx(struct b43_pio_rxqueue *q)
-{
- /* Due to latency issues we must run the RX path in
- * a workqueue to be able to schedule between packets. */
- queue_work(q->dev->wl->hw->workqueue, &q->rx_work);
-}
-
-static void b43_pio_tx_suspend_queue(struct b43_pio_txqueue *q)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&q->lock, flags);
- if (q->rev >= 8) {
- b43_piotx_write32(q, B43_PIO8_TXCTL,
- b43_piotx_read32(q, B43_PIO8_TXCTL)
- | B43_PIO8_TXCTL_SUSPREQ);
- } else {
- b43_piotx_write16(q, B43_PIO_TXCTL,
- b43_piotx_read16(q, B43_PIO_TXCTL)
- | B43_PIO_TXCTL_SUSPREQ);
- }
- spin_unlock_irqrestore(&q->lock, flags);
-}
-
-static void b43_pio_tx_resume_queue(struct b43_pio_txqueue *q)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&q->lock, flags);
- if (q->rev >= 8) {
- b43_piotx_write32(q, B43_PIO8_TXCTL,
- b43_piotx_read32(q, B43_PIO8_TXCTL)
- & ~B43_PIO8_TXCTL_SUSPREQ);
- } else {
- b43_piotx_write16(q, B43_PIO_TXCTL,
- b43_piotx_read16(q, B43_PIO_TXCTL)
- & ~B43_PIO_TXCTL_SUSPREQ);
- }
- spin_unlock_irqrestore(&q->lock, flags);
-}
-
-void b43_pio_tx_suspend(struct b43_wldev *dev)
-{
- b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
- b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_BK);
- b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_BE);
- b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_VI);
- b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_VO);
- b43_pio_tx_suspend_queue(dev->pio.tx_queue_mcast);
-}
-
-void b43_pio_tx_resume(struct b43_wldev *dev)
-{
- b43_pio_tx_resume_queue(dev->pio.tx_queue_mcast);
- b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_VO);
- b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_VI);
- b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_BE);
- b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_BK);
- b43_power_saving_ctl_bits(dev, 0);
-}
projects / openwrt.git / blobdiff