diff options
Diffstat (limited to 'drivers/net/wireless/b43/dma.c')
| -rw-r--r-- | drivers/net/wireless/b43/dma.c | 155 |
1 files changed, 94 insertions, 61 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c index 5e8f8ac0f1dd..3e73d2a523aa 100644 --- a/drivers/net/wireless/b43/dma.c +++ b/drivers/net/wireless/b43/dma.c @@ -37,6 +37,8 @@ #include <linux/pci.h> #include <linux/delay.h> #include <linux/skbuff.h> +#include <linux/etherdevice.h> + /* 32bit DMA ops. */ static @@ -165,7 +167,7 @@ static void op64_fill_descriptor(struct b43_dmaring *ring, addrhi = (((u64) dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK); addrext = (((u64) dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; - addrhi |= ssb_dma_translation(ring->dev->dev); + addrhi |= (ssb_dma_translation(ring->dev->dev) << 1); if (slot == ring->nr_slots - 1) ctl0 |= B43_DMA64_DCTL0_DTABLEEND; if (start) @@ -315,26 +317,24 @@ static struct b43_dmaring *priority_to_txring(struct b43_wldev *dev, case 3: ring = dev->dma.tx_ring0; break; - case 4: - ring = dev->dma.tx_ring4; - break; - case 5: - ring = dev->dma.tx_ring5; - break; } return ring; } -/* Bcm43xx-ring to mac80211-queue mapping */ +/* 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, 4, 5, }; + static const u8 idx_to_prio[] = { 3, 2, 1, 0, }; + unsigned int index; /*FIXME: have only one queue, for now */ return 0; - return idx_to_prio[ring->index]; + index = ring->index; + if (B43_WARN_ON(index >= ARRAY_SIZE(idx_to_prio))) + index = 0; + return idx_to_prio[index]; } u16 b43_dmacontroller_base(int dma64bit, int controller_idx) @@ -426,9 +426,21 @@ static inline static int alloc_ringmemory(struct b43_dmaring *ring) { struct device *dev = ring->dev->dev->dev; - + gfp_t flags = GFP_KERNEL; + + /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K + * alignment and 8K buffers for 64-bit DMA with 8K alignment. Testing + * has shown that 4K is sufficient for the latter as long as the buffer + * does not cross an 8K boundary. + * + * For unknown reasons - possibly a hardware error - the BCM4311 rev + * 02, which uses 64-bit DMA, needs the ring buffer in very low memory, + * which accounts for the GFP_DMA flag below. + */ + if (ring->dma64) + flags |= GFP_DMA; ring->descbase = dma_alloc_coherent(dev, B43_DMA_RINGMEMSIZE, - &(ring->dmabase), GFP_KERNEL); + &(ring->dmabase), flags); if (!ring->descbase) { b43err(ring->dev->wl, "DMA ringmemory allocation failed\n"); return -ENOMEM; @@ -483,7 +495,7 @@ int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, int dma64) return 0; } -/* Reset the RX DMA channel */ +/* Reset the TX DMA channel */ int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, int dma64) { int i; @@ -647,7 +659,7 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA64_TXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) - | trans); + | (trans << 1)); } else { u32 ringbase = (u32) (ring->dmabase); @@ -680,8 +692,9 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA64_RXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) - | trans); - b43_dma_write(ring, B43_DMA64_RXINDEX, 200); + | (trans << 1)); + b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * + sizeof(struct b43_dmadesc64)); } else { u32 ringbase = (u32) (ring->dmabase); @@ -695,11 +708,12 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA32_RXRING, (ringbase & ~SSB_DMA_TRANSLATION_MASK) | trans); - b43_dma_write(ring, B43_DMA32_RXINDEX, 200); + b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * + sizeof(struct b43_dmadesc32)); } } - out: +out: return err; } @@ -793,7 +807,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, goto err_kfree_ring; if (for_tx) { ring->txhdr_cache = kcalloc(nr_slots, - sizeof(struct b43_txhdr_fw4), + b43_txhdr_size(dev), GFP_KERNEL); if (!ring->txhdr_cache) goto err_kfree_meta; @@ -801,22 +815,21 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, /* test for ability to dma to txhdr_cache */ dma_test = dma_map_single(dev->dev->dev, ring->txhdr_cache, - sizeof(struct b43_txhdr_fw4), + b43_txhdr_size(dev), DMA_TO_DEVICE); if (dma_mapping_error(dma_test)) { /* ugh realloc */ kfree(ring->txhdr_cache); ring->txhdr_cache = kcalloc(nr_slots, - sizeof(struct - b43_txhdr_fw4), + b43_txhdr_size(dev), GFP_KERNEL | GFP_DMA); if (!ring->txhdr_cache) goto err_kfree_meta; dma_test = dma_map_single(dev->dev->dev, ring->txhdr_cache, - sizeof(struct b43_txhdr_fw4), + b43_txhdr_size(dev), DMA_TO_DEVICE); if (dma_mapping_error(dma_test)) @@ -824,7 +837,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, } dma_unmap_single(dev->dev->dev, - dma_test, sizeof(struct b43_txhdr_fw4), + dma_test, b43_txhdr_size(dev), DMA_TO_DEVICE); } @@ -901,11 +914,7 @@ static void b43_destroy_dmaring(struct b43_dmaring *ring) void b43_dma_free(struct b43_wldev *dev) { - struct b43_dma *dma; - - if (b43_using_pio(dev)) - return; - dma = &dev->dma; + struct b43_dma *dma = &dev->dma; b43_destroy_dmaring(dma->rx_ring3); dma->rx_ring3 = NULL; @@ -940,16 +949,11 @@ int b43_dma_init(struct b43_wldev *dev) err = ssb_dma_set_mask(dev->dev, dmamask); if (err) { -#ifdef B43_PIO - b43warn(dev->wl, "DMA for this device not supported. " - "Falling back to PIO\n"); - dev->__using_pio = 1; - return -EAGAIN; -#else - b43err(dev->wl, "DMA for this device not supported and " - "no PIO support compiled in\n"); + b43err(dev->wl, "The machine/kernel does not support " + "the required DMA mask (0x%08X%08X)\n", + (unsigned int)((dmamask & 0xFFFFFFFF00000000ULL) >> 32), + (unsigned int)(dmamask & 0x00000000FFFFFFFFULL)); return -EOPNOTSUPP; -#endif } err = -ENOMEM; @@ -1038,26 +1042,30 @@ static u16 generate_cookie(struct b43_dmaring *ring, int slot) * in the lower 12 bits. * Note that the cookie must never be 0, as this * is a special value used in RX path. + * It can also not be 0xFFFF because that is special + * for multicast frames. */ switch (ring->index) { case 0: - cookie = 0xA000; + cookie = 0x1000; break; case 1: - cookie = 0xB000; + cookie = 0x2000; break; case 2: - cookie = 0xC000; + cookie = 0x3000; break; case 3: - cookie = 0xD000; + cookie = 0x4000; break; case 4: - cookie = 0xE000; + cookie = 0x5000; break; case 5: - cookie = 0xF000; + cookie = 0x6000; break; + default: + B43_WARN_ON(1); } B43_WARN_ON(slot & ~0x0FFF); cookie |= (u16) slot; @@ -1073,22 +1081,22 @@ struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot) struct b43_dmaring *ring = NULL; switch (cookie & 0xF000) { - case 0xA000: + case 0x1000: ring = dma->tx_ring0; break; - case 0xB000: + case 0x2000: ring = dma->tx_ring1; break; - case 0xC000: + case 0x3000: ring = dma->tx_ring2; break; - case 0xD000: + case 0x4000: ring = dma->tx_ring3; break; - case 0xE000: + case 0x5000: ring = dma->tx_ring4; break; - case 0xF000: + case 0x6000: ring = dma->tx_ring5; break; default: @@ -1112,6 +1120,8 @@ static int dma_tx_fragment(struct b43_dmaring *ring, struct b43_dmadesc_meta *meta; struct b43_dmadesc_meta *meta_hdr; struct sk_buff *bounce_skb; + u16 cookie; + size_t hdrsize = b43_txhdr_size(ring->dev); #define SLOTS_PER_PACKET 2 B43_WARN_ON(skb_shinfo(skb)->nr_frags); @@ -1121,17 +1131,17 @@ static int dma_tx_fragment(struct b43_dmaring *ring, desc = ops->idx2desc(ring, slot, &meta_hdr); memset(meta_hdr, 0, sizeof(*meta_hdr)); - header = &(ring->txhdr_cache[slot * sizeof(struct b43_txhdr_fw4)]); + header = &(ring->txhdr_cache[slot * hdrsize]); + cookie = generate_cookie(ring, slot); b43_generate_txhdr(ring->dev, header, - skb->data, skb->len, ctl, - generate_cookie(ring, slot)); + skb->data, skb->len, ctl, cookie); meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, - sizeof(struct b43_txhdr_fw4), 1); + hdrsize, 1); if (dma_mapping_error(meta_hdr->dmaaddr)) return -EIO; ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, - sizeof(struct b43_txhdr_fw4), 1, 0, 0); + hdrsize, 1, 0, 0); /* Get a slot for the payload. */ slot = request_slot(ring); @@ -1164,16 +1174,22 @@ static int dma_tx_fragment(struct b43_dmaring *ring, ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1); + if (ctl->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM) { + /* Tell the firmware about the cookie of the last + * mcast frame, so it can clear the more-data bit in it. */ + b43_shm_write16(ring->dev, B43_SHM_SHARED, + B43_SHM_SH_MCASTCOOKIE, cookie); + } /* Now transfer the whole frame. */ wmb(); ops->poke_tx(ring, next_slot(ring, slot)); return 0; - out_free_bounce: +out_free_bounce: dev_kfree_skb_any(skb); - out_unmap_hdr: +out_unmap_hdr: unmap_descbuffer(ring, meta_hdr->dmaaddr, - sizeof(struct b43_txhdr_fw4), 1); + hdrsize, 1); return err; } @@ -1202,10 +1218,27 @@ int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb, struct ieee80211_tx_control *ctl) { struct b43_dmaring *ring; + struct ieee80211_hdr *hdr; int err = 0; unsigned long flags; - ring = priority_to_txring(dev, ctl->queue); + 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; + /* 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); + } + spin_lock_irqsave(&ring->lock, flags); B43_WARN_ON(!ring->tx); if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) { @@ -1233,7 +1266,7 @@ int b43_dma_tx(struct b43_wldev *dev, b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index); } } - out_unlock: +out_unlock: spin_unlock_irqrestore(&ring->lock, flags); return err; @@ -1265,7 +1298,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, 1); else unmap_descbuffer(ring, meta->dmaaddr, - sizeof(struct b43_txhdr_fw4), 1); + b43_txhdr_size(dev), 1); if (meta->is_last_fragment) { B43_WARN_ON(!meta->skb); |