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Release 4.11 drivers/net/wireless/broadcom/b43legacy/pio.c

/*

  Broadcom B43legacy wireless driver

  PIO Transmission

  Copyright (c) 2005 Michael Buesch <m@bues.ch>

  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 "b43legacy.h"
#include "pio.h"
#include "main.h"
#include "xmit.h"

#include <linux/delay.h>
#include <linux/slab.h>



static void tx_start(struct b43legacy_pioqueue *queue) { b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_INIT); }

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static void tx_octet(struct b43legacy_pioqueue *queue, u8 octet) { if (queue->need_workarounds) { b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_WRITELO); } else { b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_WRITELO); b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); } }

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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; }

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static void tx_data(struct b43legacy_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 b43legacy_txhdr_fw3), &i); b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); } b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_WRITELO | B43legacy_PIO_TXCTL_WRITEHI); while (i < octets - 1) { data = tx_get_next_word(txhdr, packet, sizeof(struct b43legacy_txhdr_fw3), &i); b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); } if (octets % 2) tx_octet(queue, packet[octets - sizeof(struct b43legacy_txhdr_fw3) - 1]); }

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static void tx_complete(struct b43legacy_pioqueue *queue, struct sk_buff *skb) { if (queue->need_workarounds) { b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, skb->data[skb->len - 1]); b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_WRITELO | B43legacy_PIO_TXCTL_COMPLETE); } else b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, B43legacy_PIO_TXCTL_COMPLETE); }

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static u16 generate_cookie(struct b43legacy_pioqueue *queue, struct b43legacy_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 B43legacy_MMIO_PIO1_BASE: break; case B43legacy_MMIO_PIO2_BASE: cookie = 0x1000; break; case B43legacy_MMIO_PIO3_BASE: cookie = 0x2000; break; case B43legacy_MMIO_PIO4_BASE: cookie = 0x3000; break; default: B43legacy_WARN_ON(1); } packetindex = pio_txpacket_getindex(packet); B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000)); cookie |= (u16)packetindex; return cookie; }

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static struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev, u16 cookie, struct b43legacy_pio_txpacket **packet) { struct b43legacy_pio *pio = &dev->pio; struct b43legacy_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: B43legacy_WARN_ON(1); } packetindex = (cookie & 0x0FFF); B43legacy_WARN_ON(!(packetindex >= 0 && packetindex < B43legacy_PIO_MAXTXPACKETS)); *packet = &(queue->tx_packets_cache[packetindex]); return queue; }

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union txhdr_union { struct b43legacy_txhdr_fw3 txhdr_fw3; };
static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue, struct sk_buff *skb, struct b43legacy_pio_txpacket *packet, size_t txhdr_size) { union txhdr_union txhdr_data; u8 *txhdr = NULL; unsigned int octets; int err; txhdr = (u8 *)(&txhdr_data.txhdr_fw3); B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); err = b43legacy_generate_txhdr(queue->dev, txhdr, skb->data, skb->len, IEEE80211_SKB_CB(skb), generate_cookie(queue, packet)); if (err) return err; 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); return 0; }

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static void free_txpacket(struct b43legacy_pio_txpacket *packet, int irq_context) { struct b43legacy_pioqueue *queue = packet->queue; if (packet->skb) { if (irq_context) dev_kfree_skb_irq(packet->skb); else dev_kfree_skb(packet->skb); } list_move(&packet->list, &queue->txfree); queue->nr_txfree++; }

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static int pio_tx_packet(struct b43legacy_pio_txpacket *packet) { struct b43legacy_pioqueue *queue = packet->queue; struct sk_buff *skb = packet->skb; u16 octets; int err; octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3); if (queue->tx_devq_size < octets) { b43legacywarn(queue->dev->wl, "PIO queue too small. " "Dropping packet.\n"); /* Drop it silently (return success) */ free_txpacket(packet, 1); return 0; } B43legacy_WARN_ON(queue->tx_devq_packets > B43legacy_PIO_MAXTXDEVQPACKETS); B43legacy_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 == B43legacy_PIO_MAXTXDEVQPACKETS) return -EBUSY; if (queue->tx_devq_used + octets > queue->tx_devq_size) return -EBUSY; /* Now poke the device. */ err = pio_tx_write_fragment(queue, skb, packet, sizeof(struct b43legacy_txhdr_fw3)); if (unlikely(err == -ENOKEY)) { /* Drop this packet, as we don't have the encryption key * anymore and must not transmit it unencrypted. */ free_txpacket(packet, 1); return 0; } /* 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; }

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static void tx_tasklet(unsigned long d) { struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d; struct b43legacy_wldev *dev = queue->dev; unsigned long flags; struct b43legacy_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 = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL); if (txctl & B43legacy_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); }

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static void setup_txqueues(struct b43legacy_pioqueue *queue) { struct b43legacy_pio_txpacket *packet; int i; queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS; for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) { packet = &(queue->tx_packets_cache[i]); packet->queue = queue; INIT_LIST_HEAD(&packet->list); list_add(&packet->list, &queue->txfree); } }

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static struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev, u16 pio_mmio_base) { struct b43legacy_pioqueue *queue; u32 value; 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); value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL); value &= ~B43legacy_MACCTL_BE; b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value); qsize = b43legacy_read16(dev, queue->mmio_base + B43legacy_PIO_TXQBUFSIZE); if (qsize == 0) { b43legacyerr(dev->wl, "This card does not support PIO " "operation mode. Please use DMA mode " "(module parameter pio=0).\n"); goto err_freequeue; } if (qsize <= B43legacy_PIO_TXQADJUST) { b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n", qsize); goto err_freequeue; } qsize -= B43legacy_PIO_TXQADJUST; queue->tx_devq_size = qsize; setup_txqueues(queue); out: return queue; err_freequeue: kfree(queue); queue = NULL; goto out; }

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static void cancel_transfers(struct b43legacy_pioqueue *queue) { struct b43legacy_pio_txpacket *packet, *tmp_packet; tasklet_kill(&queue->txtask); list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list) free_txpacket(packet, 0); list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) free_txpacket(packet, 0); }

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static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue) { if (!queue) return; cancel_transfers(queue); kfree(queue); }

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void b43legacy_pio_free(struct b43legacy_wldev *dev) { struct b43legacy_pio *pio; if (!b43legacy_using_pio(dev)) return; pio = &dev->pio; b43legacy_destroy_pioqueue(pio->queue3); pio->queue3 = NULL; b43legacy_destroy_pioqueue(pio->queue2); pio->queue2 = NULL; b43legacy_destroy_pioqueue(pio->queue1); pio->queue1 = NULL; b43legacy_destroy_pioqueue(pio->queue0); pio->queue0 = NULL; }

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int b43legacy_pio_init(struct b43legacy_wldev *dev) { struct b43legacy_pio *pio = &dev->pio; struct b43legacy_pioqueue *queue; int err = -ENOMEM; queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE); if (!queue) goto out; pio->queue0 = queue; queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE); if (!queue) goto err_destroy0; pio->queue1 = queue; queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE); if (!queue) goto err_destroy1; pio->queue2 = queue; queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE); if (!queue) goto err_destroy2; pio->queue3 = queue; if (dev->dev->id.revision < 3) dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND; b43legacydbg(dev->wl, "PIO initialized\n"); err = 0; out: return err; err_destroy2: b43legacy_destroy_pioqueue(pio->queue2); pio->queue2 = NULL; err_destroy1: b43legacy_destroy_pioqueue(pio->queue1); pio->queue1 = NULL; err_destroy0: b43legacy_destroy_pioqueue(pio->queue0); pio->queue0 = NULL; goto out; }

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int b43legacy_pio_tx(struct b43legacy_wldev *dev, struct sk_buff *skb) { struct b43legacy_pioqueue *queue = dev->pio.queue1; struct b43legacy_pio_txpacket *packet; B43legacy_WARN_ON(queue->tx_suspended); B43legacy_WARN_ON(list_empty(&queue->txfree)); packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket, list); packet->skb = skb; list_move_tail(&packet->list, &queue->txqueue); queue->nr_txfree--; B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS); tasklet_schedule(&queue->txtask); return 0; }

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void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, const struct b43legacy_txstatus *status) { struct b43legacy_pioqueue *queue; struct b43legacy_pio_txpacket *packet; struct ieee80211_tx_info *info; int retry_limit; queue = parse_cookie(dev, status->cookie, &packet); B43legacy_WARN_ON(!queue); if (!packet->skb) return; queue->tx_devq_packets--; queue->tx_devq_used -= (packet->skb->len + sizeof(struct b43legacy_txhdr_fw3)); info = IEEE80211_SKB_CB(packet->skb); /* preserve the confiured retry limit before clearing the status * The xmit function has overwritten the rc's value with the actual * retry limit done by the hardware */ retry_limit = info->status.rates[0].count; ieee80211_tx_info_clear_status(info); if (status->acked) info->flags |= IEEE80211_TX_STAT_ACK; if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { /* * If the short retries (RTS, not data frame) have exceeded * the limit, the hw will not have tried the selected rate, * but will have used the fallback rate instead. * Don't let the rate control count attempts for the selected * rate in this case, otherwise the statistics will be off. */ info->status.rates[0].count = 0; info->status.rates[1].count = status->frame_count; } else { if (status->frame_count > retry_limit) { info->status.rates[0].count = retry_limit; info->status.rates[1].count = status->frame_count - retry_limit; } else { info->status.rates[0].count = status->frame_count; info->status.rates[1].idx = -1; } } ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb); packet->skb = NULL; free_txpacket(packet, 1); /* If there are packets on the txqueue, poke the tasklet * to transmit them. */ if (!list_empty(&queue->txqueue)) tasklet_schedule(&queue->txtask); }

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static void pio_rx_error(struct b43legacy_pioqueue *queue, int clear_buffers, const char *error) { int i; b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error); b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, B43legacy_PIO_RXCTL_READY); if (clear_buffers) { B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE); for (i = 0; i < 15; i++) { /* Dummy read. */ b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); } } }

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void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) { __le16 preamble[21] = { 0 }; struct b43legacy_rxhdr_fw3 *rxhdr; u16 tmp; u16 len; u16 macstat; int i; int preamble_readwords; struct sk_buff *skb; tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE)) return; b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, B43legacy_PIO_RXCTL_DATAAVAILABLE); for (i = 0; i < 10; i++) { tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); if (tmp & B43legacy_PIO_RXCTL_READY) goto data_ready; udelay(10); } b43legacydbg(queue->dev->wl, "PIO RX timed out\n"); return; data_ready: len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); if (unlikely(len > 0x700)) { pio_rx_error(queue, 0, "len > 0x700"); return; } if (unlikely(len == 0 && queue->mmio_base != B43legacy_MMIO_PIO4_BASE)) { pio_rx_error(queue, 0, "len == 0"); return; } preamble[0] = cpu_to_le16(len); if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) preamble_readwords = 14 / sizeof(u16); else preamble_readwords = 18 / sizeof(u16); for (i = 0; i < preamble_readwords; i++) { tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); preamble[i + 1] = cpu_to_le16(tmp); } rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble; macstat = le16_to_cpu(rxhdr->mac_status); if (macstat & B43legacy_RX_MAC_FCSERR) { pio_rx_error(queue, (queue->mmio_base == B43legacy_MMIO_PIO1_BASE), "Frame FCS error"); return; } if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) { /* We received an xmit status. */ struct b43legacy_hwtxstatus *hw; hw = (struct b43legacy_hwtxstatus *)(preamble + 1); b43legacy_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 = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp); } if (len % 2) { tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); skb->data[len - 1] = (tmp & 0x00FF); } b43legacy_rx(queue->dev, skb, rxhdr); }

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void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) { b43legacy_power_saving_ctl_bits(queue->dev, -1, 1); b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) | B43legacy_PIO_TXCTL_SUSPEND); }

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void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) { b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) & ~B43legacy_PIO_TXCTL_SUSPEND); b43legacy_power_saving_ctl_bits(queue->dev, -1, -1); tasklet_schedule(&queue->txtask); }

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void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) { struct b43legacy_pio *pio; B43legacy_WARN_ON(!b43legacy_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; }

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void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) { struct b43legacy_pio *pio; B43legacy_WARN_ON(!b43legacy_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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Michael Büsch10.03%110.00%
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