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path: root/drivers/net/wireless/b43/dma.c
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Diffstat (limited to 'drivers/net/wireless/b43/dma.c')
-rw-r--r--drivers/net/wireless/b43/dma.c440
1 files changed, 209 insertions, 231 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 48e912487b16..21c886a9a1d9 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -38,6 +38,7 @@
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
+#include <asm/div64.h>
/* 32bit DMA ops. */
@@ -291,52 +292,6 @@ static inline int request_slot(struct b43_dmaring *ring)
return slot;
}
-/* Mac80211-queue to b43-ring mapping */
-static struct b43_dmaring *priority_to_txring(struct b43_wldev *dev,
- int queue_priority)
-{
- struct b43_dmaring *ring;
-
-/*FIXME: For now we always run on TX-ring-1 */
- return dev->dma.tx_ring1;
-
- /* 0 = highest priority */
- switch (queue_priority) {
- default:
- B43_WARN_ON(1);
- /* fallthrough */
- case 0:
- ring = dev->dma.tx_ring3;
- break;
- case 1:
- ring = dev->dma.tx_ring2;
- break;
- case 2:
- ring = dev->dma.tx_ring1;
- break;
- case 3:
- ring = dev->dma.tx_ring0;
- break;
- }
-
- return ring;
-}
-
-/* b43-ring to mac80211-queue mapping */
-static inline int txring_to_priority(struct b43_dmaring *ring)
-{
- static const u8 idx_to_prio[] = { 3, 2, 1, 0, };
- unsigned int index;
-
-/*FIXME: have only one queue, for now */
- return 0;
-
- index = ring->index;
- if (B43_WARN_ON(index >= ARRAY_SIZE(idx_to_prio)))
- index = 0;
- return idx_to_prio[index];
-}
-
static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx)
{
static const u16 map64[] = {
@@ -596,7 +551,6 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
struct b43_dmadesc_meta *meta, gfp_t gfp_flags)
{
struct b43_rxhdr_fw4 *rxhdr;
- struct b43_hwtxstatus *txstat;
dma_addr_t dmaaddr;
struct sk_buff *skb;
@@ -632,8 +586,6 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
rxhdr = (struct b43_rxhdr_fw4 *)(skb->data);
rxhdr->frame_len = 0;
- txstat = (struct b43_hwtxstatus *)(skb->data);
- txstat->cookie = 0;
return 0;
}
@@ -822,6 +774,18 @@ static u64 supported_dma_mask(struct b43_wldev *dev)
return DMA_30BIT_MASK;
}
+static enum b43_dmatype dma_mask_to_engine_type(u64 dmamask)
+{
+ if (dmamask == DMA_30BIT_MASK)
+ return B43_DMA_30BIT;
+ if (dmamask == DMA_32BIT_MASK)
+ return B43_DMA_32BIT;
+ if (dmamask == DMA_64BIT_MASK)
+ return B43_DMA_64BIT;
+ B43_WARN_ON(1);
+ return B43_DMA_30BIT;
+}
+
/* Main initialization function. */
static
struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
@@ -937,16 +901,52 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
goto out;
}
+#define divide(a, b) ({ \
+ typeof(a) __a = a; \
+ do_div(__a, b); \
+ __a; \
+ })
+
+#define modulo(a, b) ({ \
+ typeof(a) __a = a; \
+ do_div(__a, b); \
+ })
+
/* Main cleanup function. */
-static void b43_destroy_dmaring(struct b43_dmaring *ring)
+static void b43_destroy_dmaring(struct b43_dmaring *ring,
+ const char *ringname)
{
if (!ring)
return;
- b43dbg(ring->dev->wl, "DMA-%u 0x%04X (%s) max used slots: %d/%d\n",
- (unsigned int)(ring->type),
- ring->mmio_base,
- (ring->tx) ? "TX" : "RX", ring->max_used_slots, ring->nr_slots);
+#ifdef CONFIG_B43_DEBUG
+ {
+ /* Print some statistics. */
+ u64 failed_packets = ring->nr_failed_tx_packets;
+ u64 succeed_packets = ring->nr_succeed_tx_packets;
+ u64 nr_packets = failed_packets + succeed_packets;
+ u64 permille_failed = 0, average_tries = 0;
+
+ if (nr_packets)
+ permille_failed = divide(failed_packets * 1000, nr_packets);
+ if (nr_packets)
+ average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets);
+
+ b43dbg(ring->dev->wl, "DMA-%u %s: "
+ "Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, "
+ "Average tries %llu.%02llu\n",
+ (unsigned int)(ring->type), ringname,
+ ring->max_used_slots,
+ ring->nr_slots,
+ (unsigned long long)failed_packets,
+ (unsigned long long)nr_packets,
+ (unsigned long long)divide(permille_failed, 10),
+ (unsigned long long)modulo(permille_failed, 10),
+ (unsigned long long)divide(average_tries, 100),
+ (unsigned long long)modulo(average_tries, 100));
+ }
+#endif /* DEBUG */
+
/* Device IRQs are disabled prior entering this function,
* so no need to take care of concurrency with rx handler stuff.
*/
@@ -959,51 +959,36 @@ static void b43_destroy_dmaring(struct b43_dmaring *ring)
kfree(ring);
}
+#define destroy_ring(dma, ring) do { \
+ b43_destroy_dmaring((dma)->ring, __stringify(ring)); \
+ (dma)->ring = NULL; \
+ } while (0)
+
void b43_dma_free(struct b43_wldev *dev)
{
- struct b43_dma *dma = &dev->dma;
+ struct b43_dma *dma;
- b43_destroy_dmaring(dma->rx_ring3);
- dma->rx_ring3 = NULL;
- b43_destroy_dmaring(dma->rx_ring0);
- dma->rx_ring0 = NULL;
-
- b43_destroy_dmaring(dma->tx_ring5);
- dma->tx_ring5 = NULL;
- b43_destroy_dmaring(dma->tx_ring4);
- dma->tx_ring4 = NULL;
- b43_destroy_dmaring(dma->tx_ring3);
- dma->tx_ring3 = NULL;
- b43_destroy_dmaring(dma->tx_ring2);
- dma->tx_ring2 = NULL;
- b43_destroy_dmaring(dma->tx_ring1);
- dma->tx_ring1 = NULL;
- b43_destroy_dmaring(dma->tx_ring0);
- dma->tx_ring0 = NULL;
+ if (b43_using_pio_transfers(dev))
+ return;
+ dma = &dev->dma;
+
+ destroy_ring(dma, rx_ring);
+ destroy_ring(dma, tx_ring_AC_BK);
+ destroy_ring(dma, tx_ring_AC_BE);
+ destroy_ring(dma, tx_ring_AC_VI);
+ destroy_ring(dma, tx_ring_AC_VO);
+ destroy_ring(dma, tx_ring_mcast);
}
int b43_dma_init(struct b43_wldev *dev)
{
struct b43_dma *dma = &dev->dma;
- struct b43_dmaring *ring;
int err;
u64 dmamask;
enum b43_dmatype type;
dmamask = supported_dma_mask(dev);
- switch (dmamask) {
- default:
- B43_WARN_ON(1);
- case DMA_30BIT_MASK:
- type = B43_DMA_30BIT;
- break;
- case DMA_32BIT_MASK:
- type = B43_DMA_32BIT;
- break;
- case DMA_64BIT_MASK:
- type = B43_DMA_64BIT;
- break;
- }
+ type = dma_mask_to_engine_type(dmamask);
err = ssb_dma_set_mask(dev->dev, dmamask);
if (err) {
b43err(dev->wl, "The machine/kernel does not support "
@@ -1015,83 +1000,57 @@ int b43_dma_init(struct b43_wldev *dev)
err = -ENOMEM;
/* setup TX DMA channels. */
- ring = b43_setup_dmaring(dev, 0, 1, type);
- if (!ring)
+ dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type);
+ if (!dma->tx_ring_AC_BK)
goto out;
- dma->tx_ring0 = ring;
- ring = b43_setup_dmaring(dev, 1, 1, type);
- if (!ring)
- goto err_destroy_tx0;
- dma->tx_ring1 = ring;
+ dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type);
+ if (!dma->tx_ring_AC_BE)
+ goto err_destroy_bk;
- ring = b43_setup_dmaring(dev, 2, 1, type);
- if (!ring)
- goto err_destroy_tx1;
- dma->tx_ring2 = ring;
+ dma->tx_ring_AC_VI = b43_setup_dmaring(dev, 2, 1, type);
+ if (!dma->tx_ring_AC_VI)
+ goto err_destroy_be;
- ring = b43_setup_dmaring(dev, 3, 1, type);
- if (!ring)
- goto err_destroy_tx2;
- dma->tx_ring3 = ring;
+ dma->tx_ring_AC_VO = b43_setup_dmaring(dev, 3, 1, type);
+ if (!dma->tx_ring_AC_VO)
+ goto err_destroy_vi;
- ring = b43_setup_dmaring(dev, 4, 1, type);
- if (!ring)
- goto err_destroy_tx3;
- dma->tx_ring4 = ring;
+ dma->tx_ring_mcast = b43_setup_dmaring(dev, 4, 1, type);
+ if (!dma->tx_ring_mcast)
+ goto err_destroy_vo;
- ring = b43_setup_dmaring(dev, 5, 1, type);
- if (!ring)
- goto err_destroy_tx4;
- dma->tx_ring5 = ring;
+ /* setup RX DMA channel. */
+ dma->rx_ring = b43_setup_dmaring(dev, 0, 0, type);
+ if (!dma->rx_ring)
+ goto err_destroy_mcast;
- /* setup RX DMA channels. */
- ring = b43_setup_dmaring(dev, 0, 0, type);
- if (!ring)
- goto err_destroy_tx5;
- dma->rx_ring0 = ring;
-
- if (dev->dev->id.revision < 5) {
- ring = b43_setup_dmaring(dev, 3, 0, type);
- if (!ring)
- goto err_destroy_rx0;
- dma->rx_ring3 = ring;
- }
+ /* No support for the TX status DMA ring. */
+ B43_WARN_ON(dev->dev->id.revision < 5);
b43dbg(dev->wl, "%u-bit DMA initialized\n",
(unsigned int)type);
err = 0;
- out:
+out:
return err;
- err_destroy_rx0:
- b43_destroy_dmaring(dma->rx_ring0);
- dma->rx_ring0 = NULL;
- err_destroy_tx5:
- b43_destroy_dmaring(dma->tx_ring5);
- dma->tx_ring5 = NULL;
- err_destroy_tx4:
- b43_destroy_dmaring(dma->tx_ring4);
- dma->tx_ring4 = NULL;
- err_destroy_tx3:
- b43_destroy_dmaring(dma->tx_ring3);
- dma->tx_ring3 = NULL;
- err_destroy_tx2:
- b43_destroy_dmaring(dma->tx_ring2);
- dma->tx_ring2 = NULL;
- err_destroy_tx1:
- b43_destroy_dmaring(dma->tx_ring1);
- dma->tx_ring1 = NULL;
- err_destroy_tx0:
- b43_destroy_dmaring(dma->tx_ring0);
- dma->tx_ring0 = NULL;
- goto out;
+err_destroy_mcast:
+ destroy_ring(dma, tx_ring_mcast);
+err_destroy_vo:
+ destroy_ring(dma, tx_ring_AC_VO);
+err_destroy_vi:
+ destroy_ring(dma, tx_ring_AC_VI);
+err_destroy_be:
+ destroy_ring(dma, tx_ring_AC_BE);
+err_destroy_bk:
+ destroy_ring(dma, tx_ring_AC_BK);
+ return err;
}
/* Generate a cookie for the TX header. */
static u16 generate_cookie(struct b43_dmaring *ring, int slot)
{
- u16 cookie = 0x1000;
+ u16 cookie;
/* Use the upper 4 bits of the cookie as
* DMA controller ID and store the slot number
@@ -1101,30 +1060,9 @@ static u16 generate_cookie(struct b43_dmaring *ring, int slot)
* It can also not be 0xFFFF because that is special
* for multicast frames.
*/
- switch (ring->index) {
- case 0:
- cookie = 0x1000;
- break;
- case 1:
- cookie = 0x2000;
- break;
- case 2:
- cookie = 0x3000;
- break;
- case 3:
- cookie = 0x4000;
- break;
- case 4:
- cookie = 0x5000;
- break;
- case 5:
- cookie = 0x6000;
- break;
- default:
- B43_WARN_ON(1);
- }
+ cookie = (((u16)ring->index + 1) << 12);
B43_WARN_ON(slot & ~0x0FFF);
- cookie |= (u16) slot;
+ cookie |= (u16)slot;
return cookie;
}
@@ -1138,22 +1076,19 @@ struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot)
switch (cookie & 0xF000) {
case 0x1000:
- ring = dma->tx_ring0;
+ ring = dma->tx_ring_AC_BK;
break;
case 0x2000:
- ring = dma->tx_ring1;
+ ring = dma->tx_ring_AC_BE;
break;
case 0x3000:
- ring = dma->tx_ring2;
+ ring = dma->tx_ring_AC_VI;
break;
case 0x4000:
- ring = dma->tx_ring3;
+ ring = dma->tx_ring_AC_VO;
break;
case 0x5000:
- ring = dma->tx_ring4;
- break;
- case 0x6000:
- ring = dma->tx_ring5;
+ ring = dma->tx_ring_mcast;
break;
default:
B43_WARN_ON(1);
@@ -1180,7 +1115,6 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
size_t hdrsize = b43_txhdr_size(ring->dev);
#define SLOTS_PER_PACKET 2
- B43_WARN_ON(skb_shinfo(skb)->nr_frags);
old_top_slot = ring->current_slot;
old_used_slots = ring->used_slots;
@@ -1285,6 +1219,37 @@ static inline int should_inject_overflow(struct b43_dmaring *ring)
return 0;
}
+/* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */
+static struct b43_dmaring * select_ring_by_priority(struct b43_wldev *dev,
+ u8 queue_prio)
+{
+ struct b43_dmaring *ring;
+
+ if (b43_modparam_qos) {
+ /* 0 = highest priority */
+ switch (queue_prio) {
+ default:
+ B43_WARN_ON(1);
+ /* fallthrough */
+ case 0:
+ ring = dev->dma.tx_ring_AC_VO;
+ break;
+ case 1:
+ ring = dev->dma.tx_ring_AC_VI;
+ break;
+ case 2:
+ ring = dev->dma.tx_ring_AC_BE;
+ break;
+ case 3:
+ ring = dev->dma.tx_ring_AC_BK;
+ break;
+ }
+ } else
+ ring = dev->dma.tx_ring_AC_BE;
+
+ return ring;
+}
+
int b43_dma_tx(struct b43_wldev *dev,
struct sk_buff *skb, struct ieee80211_tx_control *ctl)
{
@@ -1293,21 +1258,16 @@ int b43_dma_tx(struct b43_wldev *dev,
int err = 0;
unsigned long flags;
- if (unlikely(skb->len < 2 + 2 + 6)) {
- /* Too short, this can't be a valid frame. */
- return -EINVAL;
- }
-
hdr = (struct ieee80211_hdr *)skb->data;
if (ctl->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM) {
/* The multicast ring will be sent after the DTIM */
- ring = dev->dma.tx_ring4;
+ ring = dev->dma.tx_ring_mcast;
/* Set the more-data bit. Ucode will clear it on
* the last frame for us. */
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
} else {
/* Decide by priority where to put this frame. */
- ring = priority_to_txring(dev, ctl->queue);
+ ring = select_ring_by_priority(dev, ctl->queue);
}
spin_lock_irqsave(&ring->lock, flags);
@@ -1322,6 +1282,11 @@ int b43_dma_tx(struct b43_wldev *dev,
* That would be a mac80211 bug. */
B43_WARN_ON(ring->stopped);
+ /* Assign the queue number to the ring (if not already done before)
+ * so TX status handling can use it. The queue to ring mapping is
+ * static, so we don't need to store it per frame. */
+ ring->queue_prio = ctl->queue;
+
err = dma_tx_fragment(ring, skb, ctl);
if (unlikely(err == -ENOKEY)) {
/* Drop this packet, as we don't have the encryption key
@@ -1338,7 +1303,7 @@ int b43_dma_tx(struct b43_wldev *dev,
if ((free_slots(ring) < SLOTS_PER_PACKET) ||
should_inject_overflow(ring)) {
/* This TX ring is full. */
- ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring));
+ ieee80211_stop_queue(dev->wl->hw, ctl->queue);
ring->stopped = 1;
if (b43_debug(dev, B43_DBG_DMAVERBOSE)) {
b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index);
@@ -1359,6 +1324,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
struct b43_dmadesc_generic *desc;
struct b43_dmadesc_meta *meta;
int slot;
+ bool frame_succeed;
ring = parse_cookie(dev, status->cookie, &slot);
if (unlikely(!ring))
@@ -1385,18 +1351,15 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
* status of the transmission.
* Some fields of txstat are already filled in dma_tx().
*/
- if (status->acked) {
- meta->txstat.flags |= IEEE80211_TX_STATUS_ACK;
- } else {
- if (!(meta->txstat.control.flags
- & IEEE80211_TXCTL_NO_ACK))
- meta->txstat.excessive_retries = 1;
- }
- if (status->frame_count == 0) {
- /* The frame was not transmitted at all. */
- meta->txstat.retry_count = 0;
- } else
- meta->txstat.retry_count = status->frame_count - 1;
+ frame_succeed = b43_fill_txstatus_report(
+ &(meta->txstat), status);
+#ifdef CONFIG_B43_DEBUG
+ if (frame_succeed)
+ ring->nr_succeed_tx_packets++;
+ else
+ ring->nr_failed_tx_packets++;
+ ring->nr_total_packet_tries += status->frame_count;
+#endif /* DEBUG */
ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb,
&(meta->txstat));
/* skb is freed by ieee80211_tx_status_irqsafe() */
@@ -1418,7 +1381,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
dev->stats.last_tx = jiffies;
if (ring->stopped) {
B43_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET);
- ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring));
+ ieee80211_wake_queue(dev->wl->hw, ring->queue_prio);
ring->stopped = 0;
if (b43_debug(dev, B43_DBG_DMAVERBOSE)) {
b43dbg(dev->wl, "Woke up TX ring %d\n", ring->index);
@@ -1439,7 +1402,7 @@ void b43_dma_get_tx_stats(struct b43_wldev *dev,
for (i = 0; i < nr_queues; i++) {
data = &(stats->data[i]);
- ring = priority_to_txring(dev, i);
+ ring = select_ring_by_priority(dev, i);
spin_lock_irqsave(&ring->lock, flags);
data->len = ring->used_slots / SLOTS_PER_PACKET;
@@ -1465,25 +1428,6 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize);
skb = meta->skb;
- if (ring->index == 3) {
- /* We received an xmit status. */
- struct b43_hwtxstatus *hw = (struct b43_hwtxstatus *)skb->data;
- int i = 0;
-
- while (hw->cookie == 0) {
- if (i > 100)
- break;
- i++;
- udelay(2);
- barrier();
- }
- b43_handle_hwtxstatus(ring->dev, hw);
- /* recycle the descriptor buffer. */
- sync_descbuffer_for_device(ring, meta->dmaaddr,
- ring->rx_buffersize);
-
- return;
- }
rxhdr = (struct b43_rxhdr_fw4 *)skb->data;
len = le16_to_cpu(rxhdr->frame_len);
if (len == 0) {
@@ -1540,7 +1484,7 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
skb_pull(skb, ring->frameoffset);
b43_rx(ring->dev, skb, rxhdr);
- drop:
+drop:
return;
}
@@ -1586,21 +1530,55 @@ static void b43_dma_tx_resume_ring(struct b43_dmaring *ring)
void b43_dma_tx_suspend(struct b43_wldev *dev)
{
b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring0);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring1);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring2);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring3);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring4);
- b43_dma_tx_suspend_ring(dev->dma.tx_ring5);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BK);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BE);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VI);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VO);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_mcast);
}
void b43_dma_tx_resume(struct b43_wldev *dev)
{
- b43_dma_tx_resume_ring(dev->dma.tx_ring5);
- b43_dma_tx_resume_ring(dev->dma.tx_ring4);
- b43_dma_tx_resume_ring(dev->dma.tx_ring3);
- b43_dma_tx_resume_ring(dev->dma.tx_ring2);
- b43_dma_tx_resume_ring(dev->dma.tx_ring1);
- b43_dma_tx_resume_ring(dev->dma.tx_ring0);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_mcast);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VO);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VI);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BE);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BK);
b43_power_saving_ctl_bits(dev, 0);
}
+
+#ifdef CONFIG_B43_PIO
+static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type,
+ u16 mmio_base, bool enable)
+{
+ u32 ctl;
+
+ if (type == B43_DMA_64BIT) {
+ ctl = b43_read32(dev, mmio_base + B43_DMA64_RXCTL);
+ ctl &= ~B43_DMA64_RXDIRECTFIFO;
+ if (enable)
+ ctl |= B43_DMA64_RXDIRECTFIFO;
+ b43_write32(dev, mmio_base + B43_DMA64_RXCTL, ctl);
+ } else {
+ ctl = b43_read32(dev, mmio_base + B43_DMA32_RXCTL);
+ ctl &= ~B43_DMA32_RXDIRECTFIFO;
+ if (enable)
+ ctl |= B43_DMA32_RXDIRECTFIFO;
+ b43_write32(dev, mmio_base + B43_DMA32_RXCTL, ctl);
+ }
+}
+
+/* Enable/Disable Direct FIFO Receive Mode (PIO) on a RX engine.
+ * This is called from PIO code, so DMA structures are not available. */
+void b43_dma_direct_fifo_rx(struct b43_wldev *dev,
+ unsigned int engine_index, bool enable)
+{
+ enum b43_dmatype type;
+ u16 mmio_base;
+
+ type = dma_mask_to_engine_type(supported_dma_mask(dev));
+
+ mmio_base = b43_dmacontroller_base(type, engine_index);
+ direct_fifo_rx(dev, type, mmio_base, enable);
+}
+#endif /* CONFIG_B43_PIO */