diff options
Diffstat (limited to 'package/b43/src/pio.c')
| -rw-r--r-- | package/b43/src/pio.c | 842 |
1 files changed, 0 insertions, 842 deletions
diff --git a/package/b43/src/pio.c b/package/b43/src/pio.c index 8b1555d95f..e69de29bb2 100644 --- a/package/b43/src/pio.c +++ b/package/b43/src/pio.c @@ -1,842 +0,0 @@ -/* - - 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); -} |