682 lines
17 KiB
C
682 lines
17 KiB
C
// 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 <m@bues.ch>
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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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/* 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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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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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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tasklet_schedule(&queue->txtask);
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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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queue = parse_cookie(dev, status->cookie, &packet);
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B43legacy_WARN_ON(!queue);
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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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info = IEEE80211_SKB_CB(packet->skb);
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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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if (status->acked)
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info->flags |= IEEE80211_TX_STAT_ACK;
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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,
|
|
* 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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|