diff options
Diffstat (limited to 'drivers/net/wireless/b43/pio.c')
| -rw-r--r-- | drivers/net/wireless/b43/pio.c | 652 |
1 files changed, 0 insertions, 652 deletions
diff --git a/drivers/net/wireless/b43/pio.c b/drivers/net/wireless/b43/pio.c deleted file mode 100644 index 67752a2..0000000 --- a/drivers/net/wireless/b43/pio.c +++ /dev/null @@ -1,652 +0,0 @@ -/* - - 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); -} |