[B43]: add mac80211-based driver for modern BCM43xx devices

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 650 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43/pio.c b/drivers/net/wireless/b43/pio.c
new file mode 100644
index 000000000000..4ac91fdd356e
--- /dev/null
+++ b/drivers/net/wireless/b43/pio.c
@@ -0,0 +1,650 @@
+/*
+
+  Broadcom B43 wireless driver
+
+  PIO Transmission
+
+  Copyright (c) 2005 Michael Buesch <mb@bu3sch.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; see the file COPYING.  If not, write to
+  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+
+*/
+
+#include "b43.h"
+#include "pio.h"
+#include "main.h"
+#include "xmit.h"
+
+#include <linux/delay.h>
+
+static void tx_start(struct b43_pioqueue *queue)
+{
+        b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_INIT);
+}
+
+static void tx_octet(struct b43_pioqueue *queue, u8 octet)
+{
+        if (queue->need_workarounds) {
+                b43_pio_write(queue, B43_PIO_TXDATA, octet);
+                b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_WRITELO);
+        } else {
+                b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_WRITELO);
+                b43_pio_write(queue, B43_PIO_TXDATA, octet);
+        }
+}
+
+static u16 tx_get_next_word(const u8 * txhdr,
+                            const u8 * packet,
+                            size_t txhdr_size, unsigned int *pos)
+{
+        const u8 *source;
+        unsigned int i = *pos;
+        u16 ret;
+
+        if (i < txhdr_size) {
+                source = txhdr;
+        } else {
+                source = packet;
+                i -= txhdr_size;
+        }
+        ret = le16_to_cpu(*((u16 *) (source + i)));
+        *pos += 2;
+
+        return ret;
+}
+
+static void tx_data(struct b43_pioqueue *queue,
+                    u8 * txhdr, const u8 * packet, unsigned int octets)
+{
+        u16 data;
+        unsigned int i = 0;
+
+        if (queue->need_workarounds) {
+                data = tx_get_next_word(txhdr, packet,
+                                        sizeof(struct b43_txhdr_fw4), &i);
+                b43_pio_write(queue, B43_PIO_TXDATA, data);
+        }
+        b43_pio_write(queue, B43_PIO_TXCTL,
+                      B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_WRITEHI);
+        while (i < octets - 1) {
+                data = tx_get_next_word(txhdr, packet,
+                                        sizeof(struct b43_txhdr_fw4), &i);
+                b43_pio_write(queue, B43_PIO_TXDATA, data);
+        }
+        if (octets % 2)
+                tx_octet(queue,
+                         packet[octets - sizeof(struct b43_txhdr_fw4) - 1]);
+}
+
+static void tx_complete(struct b43_pioqueue *queue, struct sk_buff *skb)
+{
+        if (queue->need_workarounds) {
+                b43_pio_write(queue, B43_PIO_TXDATA, skb->data[skb->len - 1]);
+                b43_pio_write(queue, B43_PIO_TXCTL,
+                              B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_COMPLETE);
+        } else {
+                b43_pio_write(queue, B43_PIO_TXCTL, B43_PIO_TXCTL_COMPLETE);
+        }
+}
+
+static u16 generate_cookie(struct b43_pioqueue *queue,
+                           struct b43_pio_txpacket *packet)
+{
+        u16 cookie = 0x0000;
+        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 B43_MMIO_PIO1_BASE:
+                break;
+        case B43_MMIO_PIO2_BASE:
+                cookie = 0x1000;
+                break;
+        case B43_MMIO_PIO3_BASE:
+                cookie = 0x2000;
+                break;
+        case B43_MMIO_PIO4_BASE:
+                cookie = 0x3000;
+                break;
+        default:
+                B43_WARN_ON(1);
+        }
+        packetindex = pio_txpacket_getindex(packet);
+        B43_WARN_ON(packetindex & ~0x0FFF);
+        cookie |= (u16) packetindex;
+
+        return cookie;
+}
+
+static
+struct b43_pioqueue *parse_cookie(struct b43_wldev *dev,
+                                  u16 cookie, struct b43_pio_txpacket **packet)
+{
+        struct b43_pio *pio = &dev->pio;
+        struct b43_pioqueue *queue = NULL;
+        int packetindex;
+
+        switch (cookie & 0xF000) {
+        case 0x0000:
+                queue = pio->queue0;
+                break;
+        case 0x1000:
+                queue = pio->queue1;
+                break;
+        case 0x2000:
+                queue = pio->queue2;
+                break;
+        case 0x3000:
+                queue = pio->queue3;
+                break;
+        default:
+                B43_WARN_ON(1);
+        }
+        packetindex = (cookie & 0x0FFF);
+        B43_WARN_ON(!(packetindex >= 0 && packetindex < B43_PIO_MAXTXPACKETS));
+        *packet = &(queue->tx_packets_cache[packetindex]);
+
+        return queue;
+}
+
+union txhdr_union {
+        struct b43_txhdr_fw4 txhdr_fw4;
+};
+
+static void pio_tx_write_fragment(struct b43_pioqueue *queue,
+                                  struct sk_buff *skb,
+                                  struct b43_pio_txpacket *packet,
+                                  size_t txhdr_size)
+{
+        union txhdr_union txhdr_data;
+        u8 *txhdr = NULL;
+        unsigned int octets;
+
+        txhdr = (u8 *) (&txhdr_data.txhdr_fw4);
+
+        B43_WARN_ON(skb_shinfo(skb)->nr_frags);
+        b43_generate_txhdr(queue->dev,
+                           txhdr, skb->data, skb->len,
+                           &packet->txstat.control,
+                           generate_cookie(queue, packet));
+
+        tx_start(queue);
+        octets = skb->len + txhdr_size;
+        if (queue->need_workarounds)
+                octets--;
+        tx_data(queue, txhdr, (u8 *) skb->data, octets);
+        tx_complete(queue, skb);
+}
+
+static void free_txpacket(struct b43_pio_txpacket *packet)
+{
+        struct b43_pioqueue *queue = packet->queue;
+
+        if (packet->skb)
+                dev_kfree_skb_any(packet->skb);
+        list_move(&packet->list, &queue->txfree);
+        queue->nr_txfree++;
+}
+
+static int pio_tx_packet(struct b43_pio_txpacket *packet)
+{
+        struct b43_pioqueue *queue = packet->queue;
+        struct sk_buff *skb = packet->skb;
+        u16 octets;
+
+        octets = (u16) skb->len + sizeof(struct b43_txhdr_fw4);
+        if (queue->tx_devq_size < octets) {
+                b43warn(queue->dev->wl, "PIO queue too small. "
+                        "Dropping packet.\n");
+                /* Drop it silently (return success) */
+                free_txpacket(packet);
+                return 0;
+        }
+        B43_WARN_ON(queue->tx_devq_packets > B43_PIO_MAXTXDEVQPACKETS);
+        B43_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
+        /* Check if there is sufficient free space on the device
+         * TX queue. If not, return and let the TX tasklet
+         * retry later.
+         */
+        if (queue->tx_devq_packets == B43_PIO_MAXTXDEVQPACKETS)
+                return -EBUSY;
+        if (queue->tx_devq_used + octets > queue->tx_devq_size)
+                return -EBUSY;
+        /* Now poke the device. */
+        pio_tx_write_fragment(queue, skb, packet, sizeof(struct b43_txhdr_fw4));
+
+        /* Account for the packet size.
+         * (We must not overflow the device TX queue)
+         */
+        queue->tx_devq_packets++;
+        queue->tx_devq_used += octets;
+
+        /* Transmission started, everything ok, move the
+         * packet to the txrunning list.
+         */
+        list_move_tail(&packet->list, &queue->txrunning);
+
+        return 0;
+}
+
+static void tx_tasklet(unsigned long d)
+{
+        struct b43_pioqueue *queue = (struct b43_pioqueue *)d;
+        struct b43_wldev *dev = queue->dev;
+        unsigned long flags;
+        struct b43_pio_txpacket *packet, *tmp_packet;
+        int err;
+        u16 txctl;
+
+        spin_lock_irqsave(&dev->wl->irq_lock, flags);
+        if (queue->tx_frozen)
+                goto out_unlock;
+        txctl = b43_pio_read(queue, B43_PIO_TXCTL);
+        if (txctl & B43_PIO_TXCTL_SUSPEND)
+                goto out_unlock;
+
+        list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
+                /* Try to transmit the packet. This can fail, if
+                 * the device queue is full. In case of failure, the
+                 * packet is left in the txqueue.
+                 * If transmission succeed, the packet is moved to txrunning.
+                 * If it is impossible to transmit the packet, it
+                 * is dropped.
+                 */
+                err = pio_tx_packet(packet);
+                if (err)
+                        break;
+        }
+      out_unlock:
+        spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
+}
+
+static void setup_txqueues(struct b43_pioqueue *queue)
+{
+        struct b43_pio_txpacket *packet;
+        int i;
+
+        queue->nr_txfree = B43_PIO_MAXTXPACKETS;
+        for (i = 0; i < B43_PIO_MAXTXPACKETS; i++) {
+                packet = &(queue->tx_packets_cache[i]);
+
+                packet->queue = queue;
+                INIT_LIST_HEAD(&packet->list);
+
+                list_add(&packet->list, &queue->txfree);
+        }
+}
+
+static
+struct b43_pioqueue *b43_setup_pioqueue(struct b43_wldev *dev,
+                                        u16 pio_mmio_base)
+{
+        struct b43_pioqueue *queue;
+        u16 qsize;
+
+        queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+        if (!queue)
+                goto out;
+
+        queue->dev = dev;
+        queue->mmio_base = pio_mmio_base;
+        queue->need_workarounds = (dev->dev->id.revision < 3);
+
+        INIT_LIST_HEAD(&queue->txfree);
+        INIT_LIST_HEAD(&queue->txqueue);
+        INIT_LIST_HEAD(&queue->txrunning);
+        tasklet_init(&queue->txtask, tx_tasklet, (unsigned long)queue);
+
+        b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
+                    & ~B43_MACCTL_BE);
+
+        qsize = b43_read16(dev, queue->mmio_base + B43_PIO_TXQBUFSIZE);
+        if (qsize == 0) {
+                b43err(dev->wl, "This card does not support PIO "
+                       "operation mode. Please use DMA mode "
+                       "(module parameter pio=0).\n");
+                goto err_freequeue;
+        }
+        if (qsize <= B43_PIO_TXQADJUST) {
+                b43err(dev->wl, "PIO tx device-queue too small (%u)\n", qsize);
+                goto err_freequeue;
+        }
+        qsize -= B43_PIO_TXQADJUST;
+        queue->tx_devq_size = qsize;
+
+        setup_txqueues(queue);
+
+      out:
+        return queue;
+
+      err_freequeue:
+        kfree(queue);
+        queue = NULL;
+        goto out;
+}
+
+static void cancel_transfers(struct b43_pioqueue *queue)
+{
+        struct b43_pio_txpacket *packet, *tmp_packet;
+
+        tasklet_disable(&queue->txtask);
+
+        list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
+            free_txpacket(packet);
+        list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
+            free_txpacket(packet);
+}
+
+static void b43_destroy_pioqueue(struct b43_pioqueue *queue)
+{
+        if (!queue)
+                return;
+
+        cancel_transfers(queue);
+        kfree(queue);
+}
+
+void b43_pio_free(struct b43_wldev *dev)
+{
+        struct b43_pio *pio;
+
+        if (!b43_using_pio(dev))
+                return;
+        pio = &dev->pio;
+
+        b43_destroy_pioqueue(pio->queue3);
+        pio->queue3 = NULL;
+        b43_destroy_pioqueue(pio->queue2);
+        pio->queue2 = NULL;
+        b43_destroy_pioqueue(pio->queue1);
+        pio->queue1 = NULL;
+        b43_destroy_pioqueue(pio->queue0);
+        pio->queue0 = NULL;
+}
+
+int b43_pio_init(struct b43_wldev *dev)
+{
+        struct b43_pio *pio = &dev->pio;
+        struct b43_pioqueue *queue;
+        int err = -ENOMEM;
+
+        queue = b43_setup_pioqueue(dev, B43_MMIO_PIO1_BASE);
+        if (!queue)
+                goto out;
+        pio->queue0 = queue;
+
+        queue = b43_setup_pioqueue(dev, B43_MMIO_PIO2_BASE);
+        if (!queue)
+                goto err_destroy0;
+        pio->queue1 = queue;
+
+        queue = b43_setup_pioqueue(dev, B43_MMIO_PIO3_BASE);
+        if (!queue)
+                goto err_destroy1;
+        pio->queue2 = queue;
+
+        queue = b43_setup_pioqueue(dev, B43_MMIO_PIO4_BASE);
+        if (!queue)
+                goto err_destroy2;
+        pio->queue3 = queue;
+
+        if (dev->dev->id.revision < 3)
+                dev->irq_savedstate |= B43_IRQ_PIO_WORKAROUND;
+
+        b43dbg(dev->wl, "PIO initialized\n");
+        err = 0;
+      out:
+        return err;
+
+      err_destroy2:
+        b43_destroy_pioqueue(pio->queue2);
+        pio->queue2 = NULL;
+      err_destroy1:
+        b43_destroy_pioqueue(pio->queue1);
+        pio->queue1 = NULL;
+      err_destroy0:
+        b43_destroy_pioqueue(pio->queue0);
+        pio->queue0 = NULL;
+        goto out;
+}
+
+int b43_pio_tx(struct b43_wldev *dev,
+               struct sk_buff *skb, struct ieee80211_tx_control *ctl)
+{
+        struct b43_pioqueue *queue = dev->pio.queue1;
+        struct b43_pio_txpacket *packet;
+
+        B43_WARN_ON(queue->tx_suspended);
+        B43_WARN_ON(list_empty(&queue->txfree));
+
+        packet = list_entry(queue->txfree.next, struct b43_pio_txpacket, list);
+        packet->skb = skb;
+
+        memset(&packet->txstat, 0, sizeof(packet->txstat));
+        memcpy(&packet->txstat.control, ctl, sizeof(*ctl));
+
+        list_move_tail(&packet->list, &queue->txqueue);
+        queue->nr_txfree--;
+        queue->nr_tx_packets++;
+        B43_WARN_ON(queue->nr_txfree >= B43_PIO_MAXTXPACKETS);
+
+        tasklet_schedule(&queue->txtask);
+
+        return 0;
+}
+
+void b43_pio_handle_txstatus(struct b43_wldev *dev,
+                             const struct b43_txstatus *status)
+{
+        struct b43_pioqueue *queue;
+        struct b43_pio_txpacket *packet;
+
+        queue = parse_cookie(dev, status->cookie, &packet);
+        if (B43_WARN_ON(!queue))
+                return;
+
+        queue->tx_devq_packets--;
+        queue->tx_devq_used -=
+            (packet->skb->len + sizeof(struct b43_txhdr_fw4));
+
+        if (status->acked) {
+                packet->txstat.flags |= IEEE80211_TX_STATUS_ACK;
+        } else {
+                if (!(packet->txstat.control.flags & IEEE80211_TXCTL_NO_ACK))
+                        packet->txstat.excessive_retries = 1;
+        }
+        if (status->frame_count == 0) {
+                /* The frame was not transmitted at all. */
+                packet->txstat.retry_count = 0;
+        } else
+                packet->txstat.retry_count = status->frame_count - 1;
+        ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb,
+                                    &(packet->txstat));
+        packet->skb = NULL;
+
+        free_txpacket(packet);
+        /* If there are packets on the txqueue, poke the tasklet
+         * to transmit them.
+         */
+        if (!list_empty(&queue->txqueue))
+                tasklet_schedule(&queue->txtask);
+}
+
+void b43_pio_get_tx_stats(struct b43_wldev *dev,
+                          struct ieee80211_tx_queue_stats *stats)
+{
+        struct b43_pio *pio = &dev->pio;
+        struct b43_pioqueue *queue;
+        struct ieee80211_tx_queue_stats_data *data;
+
+        queue = pio->queue1;
+        data = &(stats->data[0]);
+        data->len = B43_PIO_MAXTXPACKETS - queue->nr_txfree;
+        data->limit = B43_PIO_MAXTXPACKETS;
+        data->count = queue->nr_tx_packets;
+}
+
+static void pio_rx_error(struct b43_pioqueue *queue,
+                         int clear_buffers, const char *error)
+{
+        int i;
+
+        b43err(queue->dev->wl, "PIO RX error: %s\n", error);
+        b43_pio_write(queue, B43_PIO_RXCTL, B43_PIO_RXCTL_READY);
+        if (clear_buffers) {
+                B43_WARN_ON(queue->mmio_base != B43_MMIO_PIO1_BASE);
+                for (i = 0; i < 15; i++) {
+                        /* Dummy read. */
+                        b43_pio_read(queue, B43_PIO_RXDATA);
+                }
+        }
+}
+
+void b43_pio_rx(struct b43_pioqueue *queue)
+{
+        u16 preamble[21] = { 0 };
+        struct b43_rxhdr_fw4 *rxhdr;
+        u16 tmp, len, macstat;
+        int i, preamble_readwords;
+        struct sk_buff *skb;
+
+        tmp = b43_pio_read(queue, B43_PIO_RXCTL);
+        if (!(tmp & B43_PIO_RXCTL_DATAAVAILABLE))
+                return;
+        b43_pio_write(queue, B43_PIO_RXCTL, B43_PIO_RXCTL_DATAAVAILABLE);
+
+        for (i = 0; i < 10; i++) {
+                tmp = b43_pio_read(queue, B43_PIO_RXCTL);
+                if (tmp & B43_PIO_RXCTL_READY)
+                        goto data_ready;
+                udelay(10);
+        }
+        b43dbg(queue->dev->wl, "PIO RX timed out\n");
+        return;
+      data_ready:
+
+        len = b43_pio_read(queue, B43_PIO_RXDATA);
+        if (unlikely(len > 0x700)) {
+                pio_rx_error(queue, 0, "len > 0x700");
+                return;
+        }
+        if (unlikely(len == 0 && queue->mmio_base != B43_MMIO_PIO4_BASE)) {
+                pio_rx_error(queue, 0, "len == 0");
+                return;
+        }
+        preamble[0] = cpu_to_le16(len);
+        if (queue->mmio_base == B43_MMIO_PIO4_BASE)
+                preamble_readwords = 14 / sizeof(u16);
+        else
+                preamble_readwords = 18 / sizeof(u16);
+        for (i = 0; i < preamble_readwords; i++) {
+                tmp = b43_pio_read(queue, B43_PIO_RXDATA);
+                preamble[i + 1] = cpu_to_le16(tmp);
+        }
+        rxhdr = (struct b43_rxhdr_fw4 *)preamble;
+        macstat = le16_to_cpu(rxhdr->mac_status);
+        if (macstat & B43_RX_MAC_FCSERR) {
+                pio_rx_error(queue,
+                             (queue->mmio_base == B43_MMIO_PIO1_BASE),
+                             "Frame FCS error");
+                return;
+        }
+        if (queue->mmio_base == B43_MMIO_PIO4_BASE) {
+                /* We received an xmit status. */
+                struct b43_hwtxstatus *hw;
+
+                hw = (struct b43_hwtxstatus *)(preamble + 1);
+                b43_handle_hwtxstatus(queue->dev, hw);
+
+                return;
+        }
+
+        skb = dev_alloc_skb(len);
+        if (unlikely(!skb)) {
+                pio_rx_error(queue, 1, "OOM");
+                return;
+        }
+        skb_put(skb, len);
+        for (i = 0; i < len - 1; i += 2) {
+                tmp = b43_pio_read(queue, B43_PIO_RXDATA);
+                *((u16 *) (skb->data + i)) = cpu_to_le16(tmp);
+        }
+        if (len % 2) {
+                tmp = b43_pio_read(queue, B43_PIO_RXDATA);
+                skb->data[len - 1] = (tmp & 0x00FF);
+/* The specs say the following is required, but
+ * it is wrong and corrupts the PLCP. If we don't do
+ * this, the PLCP seems to be correct. So ifdef it out for now.
+ */
+#if 0
+                if (rxflags2 & B43_RXHDR_FLAGS2_TYPE2FRAME)
+                        skb->data[2] = (tmp & 0xFF00) >> 8;
+                else
+                        skb->data[0] = (tmp & 0xFF00) >> 8;
+#endif
+        }
+        b43_rx(queue->dev, skb, rxhdr);
+}
+
+void b43_pio_tx_suspend(struct b43_pioqueue *queue)
+{
+        b43_power_saving_ctl_bits(queue->dev, B43_PS_AWAKE);
+        b43_pio_write(queue, B43_PIO_TXCTL, b43_pio_read(queue, B43_PIO_TXCTL)
+                      | B43_PIO_TXCTL_SUSPEND);
+}
+
+void b43_pio_tx_resume(struct b43_pioqueue *queue)
+{
+        b43_pio_write(queue, B43_PIO_TXCTL, b43_pio_read(queue, B43_PIO_TXCTL)
+                      & ~B43_PIO_TXCTL_SUSPEND);
+        b43_power_saving_ctl_bits(queue->dev, 0);
+        tasklet_schedule(&queue->txtask);
+}
+
+void b43_pio_freeze_txqueues(struct b43_wldev *dev)
+{
+        struct b43_pio *pio;
+
+        B43_WARN_ON(!b43_using_pio(dev));
+        pio = &dev->pio;
+        pio->queue0->tx_frozen = 1;
+        pio->queue1->tx_frozen = 1;
+        pio->queue2->tx_frozen = 1;
+        pio->queue3->tx_frozen = 1;
+}
+
+void b43_pio_thaw_txqueues(struct b43_wldev *dev)
+{
+        struct b43_pio *pio;
+
+        B43_WARN_ON(!b43_using_pio(dev));
+        pio = &dev->pio;
+        pio->queue0->tx_frozen = 0;
+        pio->queue1->tx_frozen = 0;
+        pio->queue2->tx_frozen = 0;
+        pio->queue3->tx_frozen = 0;
+        if (!list_empty(&pio->queue0->txqueue))
+                tasklet_schedule(&pio->queue0->txtask);
+        if (!list_empty(&pio->queue1->txqueue))
+                tasklet_schedule(&pio->queue1->txtask);
+        if (!list_empty(&pio->queue2->txqueue))
+                tasklet_schedule(&pio->queue2->txtask);
+        if (!list_empty(&pio->queue3->txqueue))
+                tasklet_schedule(&pio->queue3->txtask);
+}