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681 lines
17 KiB
681 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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Broadcom B43legacy wireless driver |
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PIO Transmission |
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Copyright (c) 2005 Michael Buesch <[email protected]> |
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*/ |
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#include "b43legacy.h" |
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#include "pio.h" |
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#include "main.h" |
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#include "xmit.h" |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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static void tx_start(struct b43legacy_pioqueue *queue) |
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{ |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_INIT); |
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} |
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static void tx_octet(struct b43legacy_pioqueue *queue, |
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u8 octet) |
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{ |
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if (queue->need_workarounds) { |
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b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_WRITELO); |
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} else { |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_WRITELO); |
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b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); |
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} |
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} |
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static u16 tx_get_next_word(const u8 *txhdr, |
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const u8 *packet, |
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size_t txhdr_size, |
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unsigned int *pos) |
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{ |
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const u8 *source; |
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unsigned int i = *pos; |
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u16 ret; |
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if (i < txhdr_size) |
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source = txhdr; |
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else { |
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source = packet; |
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i -= txhdr_size; |
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} |
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ret = le16_to_cpu(*((__le16 *)(source + i))); |
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*pos += 2; |
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return ret; |
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} |
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static void tx_data(struct b43legacy_pioqueue *queue, |
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u8 *txhdr, |
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const u8 *packet, |
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unsigned int octets) |
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{ |
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u16 data; |
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unsigned int i = 0; |
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if (queue->need_workarounds) { |
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data = tx_get_next_word(txhdr, packet, |
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sizeof(struct b43legacy_txhdr_fw3), &i); |
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b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); |
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} |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_WRITELO | |
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B43legacy_PIO_TXCTL_WRITEHI); |
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while (i < octets - 1) { |
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data = tx_get_next_word(txhdr, packet, |
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sizeof(struct b43legacy_txhdr_fw3), &i); |
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b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); |
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} |
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if (octets % 2) |
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tx_octet(queue, packet[octets - |
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sizeof(struct b43legacy_txhdr_fw3) - 1]); |
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} |
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static void tx_complete(struct b43legacy_pioqueue *queue, |
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struct sk_buff *skb) |
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{ |
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if (queue->need_workarounds) { |
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b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, |
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skb->data[skb->len - 1]); |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_WRITELO | |
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B43legacy_PIO_TXCTL_COMPLETE); |
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} else |
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b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, |
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B43legacy_PIO_TXCTL_COMPLETE); |
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} |
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static u16 generate_cookie(struct b43legacy_pioqueue *queue, |
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struct b43legacy_pio_txpacket *packet) |
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{ |
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u16 cookie = 0x0000; |
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int packetindex; |
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|
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/* We use the upper 4 bits for the PIO |
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* controller ID and the lower 12 bits |
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* for the packet index (in the cache). |
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*/ |
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switch (queue->mmio_base) { |
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case B43legacy_MMIO_PIO1_BASE: |
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break; |
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case B43legacy_MMIO_PIO2_BASE: |
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cookie = 0x1000; |
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break; |
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case B43legacy_MMIO_PIO3_BASE: |
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cookie = 0x2000; |
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break; |
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case B43legacy_MMIO_PIO4_BASE: |
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cookie = 0x3000; |
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break; |
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default: |
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B43legacy_WARN_ON(1); |
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} |
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packetindex = pio_txpacket_getindex(packet); |
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B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000)); |
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cookie |= (u16)packetindex; |
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return cookie; |
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} |
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static |
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struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev, |
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u16 cookie, |
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struct b43legacy_pio_txpacket **packet) |
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{ |
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struct b43legacy_pio *pio = &dev->pio; |
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struct b43legacy_pioqueue *queue = NULL; |
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int packetindex; |
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switch (cookie & 0xF000) { |
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case 0x0000: |
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queue = pio->queue0; |
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break; |
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case 0x1000: |
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queue = pio->queue1; |
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break; |
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case 0x2000: |
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queue = pio->queue2; |
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break; |
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case 0x3000: |
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queue = pio->queue3; |
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break; |
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default: |
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B43legacy_WARN_ON(1); |
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} |
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packetindex = (cookie & 0x0FFF); |
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B43legacy_WARN_ON(!(packetindex >= 0 && packetindex |
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< B43legacy_PIO_MAXTXPACKETS)); |
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*packet = &(queue->tx_packets_cache[packetindex]); |
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return queue; |
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} |
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union txhdr_union { |
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struct b43legacy_txhdr_fw3 txhdr_fw3; |
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}; |
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static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue, |
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struct sk_buff *skb, |
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struct b43legacy_pio_txpacket *packet, |
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size_t txhdr_size) |
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{ |
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union txhdr_union txhdr_data; |
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u8 *txhdr = NULL; |
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unsigned int octets; |
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int err; |
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txhdr = (u8 *)(&txhdr_data.txhdr_fw3); |
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B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); |
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err = b43legacy_generate_txhdr(queue->dev, |
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txhdr, skb->data, skb->len, |
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IEEE80211_SKB_CB(skb), |
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generate_cookie(queue, packet)); |
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if (err) |
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return err; |
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tx_start(queue); |
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octets = skb->len + txhdr_size; |
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if (queue->need_workarounds) |
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octets--; |
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tx_data(queue, txhdr, (u8 *)skb->data, octets); |
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tx_complete(queue, skb); |
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return 0; |
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} |
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static void free_txpacket(struct b43legacy_pio_txpacket *packet, |
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int irq_context) |
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{ |
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struct b43legacy_pioqueue *queue = packet->queue; |
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if (packet->skb) { |
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if (irq_context) |
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dev_kfree_skb_irq(packet->skb); |
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else |
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dev_kfree_skb(packet->skb); |
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} |
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list_move(&packet->list, &queue->txfree); |
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queue->nr_txfree++; |
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} |
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static int pio_tx_packet(struct b43legacy_pio_txpacket *packet) |
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{ |
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struct b43legacy_pioqueue *queue = packet->queue; |
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struct sk_buff *skb = packet->skb; |
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u16 octets; |
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int err; |
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octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3); |
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if (queue->tx_devq_size < octets) { |
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b43legacywarn(queue->dev->wl, "PIO queue too small. " |
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"Dropping packet.\n"); |
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/* Drop it silently (return success) */ |
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free_txpacket(packet, 1); |
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return 0; |
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} |
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B43legacy_WARN_ON(queue->tx_devq_packets > |
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B43legacy_PIO_MAXTXDEVQPACKETS); |
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B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size); |
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/* Check if there is sufficient free space on the device |
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* TX queue. If not, return and let the TX tasklet |
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* retry later. |
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*/ |
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if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS) |
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return -EBUSY; |
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if (queue->tx_devq_used + octets > queue->tx_devq_size) |
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return -EBUSY; |
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/* Now poke the device. */ |
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err = pio_tx_write_fragment(queue, skb, packet, |
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sizeof(struct b43legacy_txhdr_fw3)); |
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if (unlikely(err == -ENOKEY)) { |
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/* Drop this packet, as we don't have the encryption key |
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* anymore and must not transmit it unencrypted. */ |
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free_txpacket(packet, 1); |
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return 0; |
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} |
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/* Account for the packet size. |
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* (We must not overflow the device TX queue) |
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*/ |
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queue->tx_devq_packets++; |
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queue->tx_devq_used += octets; |
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/* Transmission started, everything ok, move the |
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* packet to the txrunning list. |
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*/ |
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list_move_tail(&packet->list, &queue->txrunning); |
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return 0; |
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} |
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static void tx_tasklet(struct tasklet_struct *t) |
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{ |
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struct b43legacy_pioqueue *queue = from_tasklet(queue, t, txtask); |
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struct b43legacy_wldev *dev = queue->dev; |
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unsigned long flags; |
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struct b43legacy_pio_txpacket *packet, *tmp_packet; |
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int err; |
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u16 txctl; |
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spin_lock_irqsave(&dev->wl->irq_lock, flags); |
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if (queue->tx_frozen) |
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goto out_unlock; |
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txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL); |
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if (txctl & B43legacy_PIO_TXCTL_SUSPEND) |
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goto out_unlock; |
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list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) { |
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/* Try to transmit the packet. This can fail, if |
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* the device queue is full. In case of failure, the |
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* packet is left in the txqueue. |
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* If transmission succeed, the packet is moved to txrunning. |
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* If it is impossible to transmit the packet, it |
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* is dropped. |
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*/ |
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err = pio_tx_packet(packet); |
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if (err) |
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break; |
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} |
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out_unlock: |
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spin_unlock_irqrestore(&dev->wl->irq_lock, flags); |
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} |
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static void setup_txqueues(struct b43legacy_pioqueue *queue) |
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{ |
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struct b43legacy_pio_txpacket *packet; |
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int i; |
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queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS; |
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for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) { |
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packet = &(queue->tx_packets_cache[i]); |
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packet->queue = queue; |
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INIT_LIST_HEAD(&packet->list); |
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list_add(&packet->list, &queue->txfree); |
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} |
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} |
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static |
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struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev, |
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u16 pio_mmio_base) |
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{ |
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struct b43legacy_pioqueue *queue; |
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u32 value; |
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u16 qsize; |
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queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
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if (!queue) |
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goto out; |
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queue->dev = dev; |
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queue->mmio_base = pio_mmio_base; |
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queue->need_workarounds = (dev->dev->id.revision < 3); |
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INIT_LIST_HEAD(&queue->txfree); |
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INIT_LIST_HEAD(&queue->txqueue); |
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INIT_LIST_HEAD(&queue->txrunning); |
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tasklet_setup(&queue->txtask, tx_tasklet); |
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value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL); |
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value &= ~B43legacy_MACCTL_BE; |
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b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value); |
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qsize = b43legacy_read16(dev, queue->mmio_base |
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+ B43legacy_PIO_TXQBUFSIZE); |
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if (qsize == 0) { |
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b43legacyerr(dev->wl, "This card does not support PIO " |
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"operation mode. Please use DMA mode " |
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"(module parameter pio=0).\n"); |
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goto err_freequeue; |
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} |
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if (qsize <= B43legacy_PIO_TXQADJUST) { |
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b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n", |
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qsize); |
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goto err_freequeue; |
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} |
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qsize -= B43legacy_PIO_TXQADJUST; |
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queue->tx_devq_size = qsize; |
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setup_txqueues(queue); |
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out: |
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return queue; |
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err_freequeue: |
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kfree(queue); |
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queue = NULL; |
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goto out; |
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} |
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static void cancel_transfers(struct b43legacy_pioqueue *queue) |
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{ |
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struct b43legacy_pio_txpacket *packet, *tmp_packet; |
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tasklet_kill(&queue->txtask); |
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list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list) |
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free_txpacket(packet, 0); |
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list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) |
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free_txpacket(packet, 0); |
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} |
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static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue) |
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{ |
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if (!queue) |
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return; |
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cancel_transfers(queue); |
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kfree(queue); |
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} |
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void b43legacy_pio_free(struct b43legacy_wldev *dev) |
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{ |
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struct b43legacy_pio *pio; |
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if (!b43legacy_using_pio(dev)) |
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return; |
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pio = &dev->pio; |
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b43legacy_destroy_pioqueue(pio->queue3); |
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pio->queue3 = NULL; |
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b43legacy_destroy_pioqueue(pio->queue2); |
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pio->queue2 = NULL; |
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b43legacy_destroy_pioqueue(pio->queue1); |
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pio->queue1 = NULL; |
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b43legacy_destroy_pioqueue(pio->queue0); |
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pio->queue0 = NULL; |
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} |
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int b43legacy_pio_init(struct b43legacy_wldev *dev) |
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{ |
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struct b43legacy_pio *pio = &dev->pio; |
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struct b43legacy_pioqueue *queue; |
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int err = -ENOMEM; |
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queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE); |
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if (!queue) |
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goto out; |
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pio->queue0 = queue; |
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queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE); |
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if (!queue) |
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goto err_destroy0; |
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pio->queue1 = queue; |
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queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE); |
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if (!queue) |
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goto err_destroy1; |
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pio->queue2 = queue; |
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queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE); |
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if (!queue) |
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goto err_destroy2; |
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pio->queue3 = queue; |
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if (dev->dev->id.revision < 3) |
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dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND; |
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b43legacydbg(dev->wl, "PIO initialized\n"); |
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err = 0; |
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out: |
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return err; |
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err_destroy2: |
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b43legacy_destroy_pioqueue(pio->queue2); |
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pio->queue2 = NULL; |
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err_destroy1: |
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b43legacy_destroy_pioqueue(pio->queue1); |
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pio->queue1 = NULL; |
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err_destroy0: |
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b43legacy_destroy_pioqueue(pio->queue0); |
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pio->queue0 = NULL; |
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goto out; |
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} |
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int b43legacy_pio_tx(struct b43legacy_wldev *dev, |
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struct sk_buff *skb) |
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{ |
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struct b43legacy_pioqueue *queue = dev->pio.queue1; |
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struct b43legacy_pio_txpacket *packet; |
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|
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B43legacy_WARN_ON(queue->tx_suspended); |
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B43legacy_WARN_ON(list_empty(&queue->txfree)); |
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packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket, |
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list); |
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packet->skb = skb; |
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|
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list_move_tail(&packet->list, &queue->txqueue); |
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queue->nr_txfree--; |
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B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS); |
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|
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tasklet_schedule(&queue->txtask); |
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|
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return 0; |
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} |
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void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, |
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const struct b43legacy_txstatus *status) |
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{ |
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struct b43legacy_pioqueue *queue; |
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struct b43legacy_pio_txpacket *packet; |
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struct ieee80211_tx_info *info; |
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int retry_limit; |
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|
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queue = parse_cookie(dev, status->cookie, &packet); |
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B43legacy_WARN_ON(!queue); |
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|
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if (!packet->skb) |
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return; |
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queue->tx_devq_packets--; |
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queue->tx_devq_used -= (packet->skb->len + |
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sizeof(struct b43legacy_txhdr_fw3)); |
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|
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info = IEEE80211_SKB_CB(packet->skb); |
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|
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/* preserve the confiured retry limit before clearing the status |
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* The xmit function has overwritten the rc's value with the actual |
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* retry limit done by the hardware */ |
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retry_limit = info->status.rates[0].count; |
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ieee80211_tx_info_clear_status(info); |
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|
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if (status->acked) |
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info->flags |= IEEE80211_TX_STAT_ACK; |
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|
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if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { |
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/* |
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* If the short retries (RTS, not data frame) have exceeded |
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* the limit, the hw will not have tried the selected rate, |
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* but will have used the fallback rate instead. |
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* Don't let the rate control count attempts for the selected |
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* rate in this case, otherwise the statistics will be off. |
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*/ |
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info->status.rates[0].count = 0; |
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info->status.rates[1].count = status->frame_count; |
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} else { |
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if (status->frame_count > retry_limit) { |
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info->status.rates[0].count = retry_limit; |
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info->status.rates[1].count = status->frame_count - |
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retry_limit; |
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|
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} else { |
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info->status.rates[0].count = status->frame_count; |
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info->status.rates[1].idx = -1; |
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} |
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} |
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ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb); |
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packet->skb = NULL; |
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|
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free_txpacket(packet, 1); |
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/* If there are packets on the txqueue, poke the tasklet |
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* to transmit them. |
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*/ |
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if (!list_empty(&queue->txqueue)) |
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tasklet_schedule(&queue->txtask); |
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} |
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|
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static void pio_rx_error(struct b43legacy_pioqueue *queue, |
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int clear_buffers, |
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const char *error) |
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{ |
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int i; |
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|
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b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error); |
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b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, |
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B43legacy_PIO_RXCTL_READY); |
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if (clear_buffers) { |
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B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE); |
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for (i = 0; i < 15; i++) { |
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/* Dummy read. */ |
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b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); |
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} |
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} |
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} |
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|
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void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) |
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{ |
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__le16 preamble[21] = { 0 }; |
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struct b43legacy_rxhdr_fw3 *rxhdr; |
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u16 tmp; |
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u16 len; |
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u16 macstat; |
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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); |
|
} |
|
|
|
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); |
|
} |
|
|
|
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); |
|
} |
|
|
|
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; |
|
} |
|
|
|
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); |
|
}
|
|
|