// SPDX-License-Identifier: GPL-2.0-or-later /* Broadcom B43 wireless driver DMA ringbuffer and descriptor allocation/management Copyright (c) 2005, 2006 Michael Buesch Some code in this file is derived from the b44.c driver Copyright (C) 2002 David S. Miller Copyright (C) Pekka Pietikainen */ #include "b43.h" #include "dma.h" #include "main.h" #include "debugfs.h" #include "xmit.h" #include #include #include #include #include #include #include /* Required number of TX DMA slots per TX frame. * This currently is 2, because we put the header and the ieee80211 frame * into separate slots. */ #define TX_SLOTS_PER_FRAME 2 static u32 b43_dma_address(struct b43_dma *dma, dma_addr_t dmaaddr, enum b43_addrtype addrtype) { u32 addr; switch (addrtype) { case B43_DMA_ADDR_LOW: addr = lower_32_bits(dmaaddr); if (dma->translation_in_low) { addr &= ~SSB_DMA_TRANSLATION_MASK; addr |= dma->translation; } break; case B43_DMA_ADDR_HIGH: addr = upper_32_bits(dmaaddr); if (!dma->translation_in_low) { addr &= ~SSB_DMA_TRANSLATION_MASK; addr |= dma->translation; } break; case B43_DMA_ADDR_EXT: if (dma->translation_in_low) addr = lower_32_bits(dmaaddr); else addr = upper_32_bits(dmaaddr); addr &= SSB_DMA_TRANSLATION_MASK; addr >>= SSB_DMA_TRANSLATION_SHIFT; break; } return addr; } /* 32bit DMA ops. */ static struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring, int slot, struct b43_dmadesc_meta **meta) { struct b43_dmadesc32 *desc; *meta = &(ring->meta[slot]); desc = ring->descbase; desc = &(desc[slot]); return (struct b43_dmadesc_generic *)desc; } static void op32_fill_descriptor(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { struct b43_dmadesc32 *descbase = ring->descbase; int slot; u32 ctl; u32 addr; u32 addrext; slot = (int)(&(desc->dma32) - descbase); B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); addr = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW); addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT); ctl = bufsize & B43_DMA32_DCTL_BYTECNT; if (slot == ring->nr_slots - 1) ctl |= B43_DMA32_DCTL_DTABLEEND; if (start) ctl |= B43_DMA32_DCTL_FRAMESTART; if (end) ctl |= B43_DMA32_DCTL_FRAMEEND; if (irq) ctl |= B43_DMA32_DCTL_IRQ; ctl |= (addrext << B43_DMA32_DCTL_ADDREXT_SHIFT) & B43_DMA32_DCTL_ADDREXT_MASK; desc->dma32.control = cpu_to_le32(ctl); desc->dma32.address = cpu_to_le32(addr); } static void op32_poke_tx(struct b43_dmaring *ring, int slot) { b43_dma_write(ring, B43_DMA32_TXINDEX, (u32) (slot * sizeof(struct b43_dmadesc32))); } static void op32_tx_suspend(struct b43_dmaring *ring) { b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) | B43_DMA32_TXSUSPEND); } static void op32_tx_resume(struct b43_dmaring *ring) { b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) & ~B43_DMA32_TXSUSPEND); } static int op32_get_current_rxslot(struct b43_dmaring *ring) { u32 val; val = b43_dma_read(ring, B43_DMA32_RXSTATUS); val &= B43_DMA32_RXDPTR; return (val / sizeof(struct b43_dmadesc32)); } static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot) { b43_dma_write(ring, B43_DMA32_RXINDEX, (u32) (slot * sizeof(struct b43_dmadesc32))); } static const struct b43_dma_ops dma32_ops = { .idx2desc = op32_idx2desc, .fill_descriptor = op32_fill_descriptor, .poke_tx = op32_poke_tx, .tx_suspend = op32_tx_suspend, .tx_resume = op32_tx_resume, .get_current_rxslot = op32_get_current_rxslot, .set_current_rxslot = op32_set_current_rxslot, }; /* 64bit DMA ops. */ static struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring, int slot, struct b43_dmadesc_meta **meta) { struct b43_dmadesc64 *desc; *meta = &(ring->meta[slot]); desc = ring->descbase; desc = &(desc[slot]); return (struct b43_dmadesc_generic *)desc; } static void op64_fill_descriptor(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { struct b43_dmadesc64 *descbase = ring->descbase; int slot; u32 ctl0 = 0, ctl1 = 0; u32 addrlo, addrhi; u32 addrext; slot = (int)(&(desc->dma64) - descbase); B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); addrlo = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW); addrhi = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_HIGH); addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT); if (slot == ring->nr_slots - 1) ctl0 |= B43_DMA64_DCTL0_DTABLEEND; if (start) ctl0 |= B43_DMA64_DCTL0_FRAMESTART; if (end) ctl0 |= B43_DMA64_DCTL0_FRAMEEND; if (irq) ctl0 |= B43_DMA64_DCTL0_IRQ; ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT; ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT) & B43_DMA64_DCTL1_ADDREXT_MASK; desc->dma64.control0 = cpu_to_le32(ctl0); desc->dma64.control1 = cpu_to_le32(ctl1); desc->dma64.address_low = cpu_to_le32(addrlo); desc->dma64.address_high = cpu_to_le32(addrhi); } static void op64_poke_tx(struct b43_dmaring *ring, int slot) { b43_dma_write(ring, B43_DMA64_TXINDEX, (u32) (slot * sizeof(struct b43_dmadesc64))); } static void op64_tx_suspend(struct b43_dmaring *ring) { b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) | B43_DMA64_TXSUSPEND); } static void op64_tx_resume(struct b43_dmaring *ring) { b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) & ~B43_DMA64_TXSUSPEND); } static int op64_get_current_rxslot(struct b43_dmaring *ring) { u32 val; val = b43_dma_read(ring, B43_DMA64_RXSTATUS); val &= B43_DMA64_RXSTATDPTR; return (val / sizeof(struct b43_dmadesc64)); } static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot) { b43_dma_write(ring, B43_DMA64_RXINDEX, (u32) (slot * sizeof(struct b43_dmadesc64))); } static const struct b43_dma_ops dma64_ops = { .idx2desc = op64_idx2desc, .fill_descriptor = op64_fill_descriptor, .poke_tx = op64_poke_tx, .tx_suspend = op64_tx_suspend, .tx_resume = op64_tx_resume, .get_current_rxslot = op64_get_current_rxslot, .set_current_rxslot = op64_set_current_rxslot, }; static inline int free_slots(struct b43_dmaring *ring) { return (ring->nr_slots - ring->used_slots); } static inline int next_slot(struct b43_dmaring *ring, int slot) { B43_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); if (slot == ring->nr_slots - 1) return 0; return slot + 1; } static inline int prev_slot(struct b43_dmaring *ring, int slot) { B43_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); if (slot == 0) return ring->nr_slots - 1; return slot - 1; } #ifdef CONFIG_B43_DEBUG static void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) { if (current_used_slots <= ring->max_used_slots) return; ring->max_used_slots = current_used_slots; if (b43_debug(ring->dev, B43_DBG_DMAVERBOSE)) { b43dbg(ring->dev->wl, "max_used_slots increased to %d on %s ring %d\n", ring->max_used_slots, ring->tx ? "TX" : "RX", ring->index); } } #else static inline void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) { } #endif /* DEBUG */ /* Request a slot for usage. */ static inline int request_slot(struct b43_dmaring *ring) { int slot; B43_WARN_ON(!ring->tx); B43_WARN_ON(ring->stopped); B43_WARN_ON(free_slots(ring) == 0); slot = next_slot(ring, ring->current_slot); ring->current_slot = slot; ring->used_slots++; update_max_used_slots(ring, ring->used_slots); return slot; } static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx) { static const u16 map64[] = { B43_MMIO_DMA64_BASE0, B43_MMIO_DMA64_BASE1, B43_MMIO_DMA64_BASE2, B43_MMIO_DMA64_BASE3, B43_MMIO_DMA64_BASE4, B43_MMIO_DMA64_BASE5, }; static const u16 map32[] = { B43_MMIO_DMA32_BASE0, B43_MMIO_DMA32_BASE1, B43_MMIO_DMA32_BASE2, B43_MMIO_DMA32_BASE3, B43_MMIO_DMA32_BASE4, B43_MMIO_DMA32_BASE5, }; if (type == B43_DMA_64BIT) { B43_WARN_ON(!(controller_idx >= 0 && controller_idx < ARRAY_SIZE(map64))); return map64[controller_idx]; } B43_WARN_ON(!(controller_idx >= 0 && controller_idx < ARRAY_SIZE(map32))); return map32[controller_idx]; } static inline dma_addr_t map_descbuffer(struct b43_dmaring *ring, unsigned char *buf, size_t len, int tx) { dma_addr_t dmaaddr; if (tx) { dmaaddr = dma_map_single(ring->dev->dev->dma_dev, buf, len, DMA_TO_DEVICE); } else { dmaaddr = dma_map_single(ring->dev->dev->dma_dev, buf, len, DMA_FROM_DEVICE); } return dmaaddr; } static inline void unmap_descbuffer(struct b43_dmaring *ring, dma_addr_t addr, size_t len, int tx) { if (tx) { dma_unmap_single(ring->dev->dev->dma_dev, addr, len, DMA_TO_DEVICE); } else { dma_unmap_single(ring->dev->dev->dma_dev, addr, len, DMA_FROM_DEVICE); } } static inline void sync_descbuffer_for_cpu(struct b43_dmaring *ring, dma_addr_t addr, size_t len) { B43_WARN_ON(ring->tx); dma_sync_single_for_cpu(ring->dev->dev->dma_dev, addr, len, DMA_FROM_DEVICE); } static inline void sync_descbuffer_for_device(struct b43_dmaring *ring, dma_addr_t addr, size_t len) { B43_WARN_ON(ring->tx); dma_sync_single_for_device(ring->dev->dev->dma_dev, addr, len, DMA_FROM_DEVICE); } static inline void free_descriptor_buffer(struct b43_dmaring *ring, struct b43_dmadesc_meta *meta) { if (meta->skb) { if (ring->tx) ieee80211_free_txskb(ring->dev->wl->hw, meta->skb); else dev_kfree_skb_any(meta->skb); meta->skb = NULL; } } static int alloc_ringmemory(struct b43_dmaring *ring) { /* 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. * In practice we could use smaller buffers for the latter, but the * alignment is really important because of the hardware bug. If bit * 0x00001000 is used in DMA address, some hardware (like BCM4331) * copies that bit into B43_DMA64_RXSTATUS and we get false values from * B43_DMA64_RXSTATDPTR. Let's just use 8K buffers even if we don't use * more than 256 slots for ring. */ u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ? B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE; ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev, ring_mem_size, &(ring->dmabase), GFP_KERNEL); if (!ring->descbase) return -ENOMEM; return 0; } static void free_ringmemory(struct b43_dmaring *ring) { u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ? B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE; dma_free_coherent(ring->dev->dev->dma_dev, ring_mem_size, ring->descbase, ring->dmabase); } /* Reset the RX DMA channel */ static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, enum b43_dmatype type) { int i; u32 value; u16 offset; might_sleep(); offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXCTL : B43_DMA32_RXCTL; b43_write32(dev, mmio_base + offset, 0); for (i = 0; i < 10; i++) { offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXSTATUS : B43_DMA32_RXSTATUS; value = b43_read32(dev, mmio_base + offset); if (type == B43_DMA_64BIT) { value &= B43_DMA64_RXSTAT; if (value == B43_DMA64_RXSTAT_DISABLED) { i = -1; break; } } else { value &= B43_DMA32_RXSTATE; if (value == B43_DMA32_RXSTAT_DISABLED) { i = -1; break; } } msleep(1); } if (i != -1) { b43err(dev->wl, "DMA RX reset timed out\n"); return -ENODEV; } return 0; } /* Reset the TX DMA channel */ static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, enum b43_dmatype type) { int i; u32 value; u16 offset; might_sleep(); for (i = 0; i < 10; i++) { offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : B43_DMA32_TXSTATUS; value = b43_read32(dev, mmio_base + offset); if (type == B43_DMA_64BIT) { value &= B43_DMA64_TXSTAT; if (value == B43_DMA64_TXSTAT_DISABLED || value == B43_DMA64_TXSTAT_IDLEWAIT || value == B43_DMA64_TXSTAT_STOPPED) break; } else { value &= B43_DMA32_TXSTATE; if (value == B43_DMA32_TXSTAT_DISABLED || value == B43_DMA32_TXSTAT_IDLEWAIT || value == B43_DMA32_TXSTAT_STOPPED) break; } msleep(1); } offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXCTL : B43_DMA32_TXCTL; b43_write32(dev, mmio_base + offset, 0); for (i = 0; i < 10; i++) { offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : B43_DMA32_TXSTATUS; value = b43_read32(dev, mmio_base + offset); if (type == B43_DMA_64BIT) { value &= B43_DMA64_TXSTAT; if (value == B43_DMA64_TXSTAT_DISABLED) { i = -1; break; } } else { value &= B43_DMA32_TXSTATE; if (value == B43_DMA32_TXSTAT_DISABLED) { i = -1; break; } } msleep(1); } if (i != -1) { b43err(dev->wl, "DMA TX reset timed out\n"); return -ENODEV; } /* ensure the reset is completed. */ msleep(1); return 0; } /* Check if a DMA mapping address is invalid. */ static bool b43_dma_mapping_error(struct b43_dmaring *ring, dma_addr_t addr, size_t buffersize, bool dma_to_device) { if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr))) return true; switch (ring->type) { case B43_DMA_30BIT: if ((u64)addr + buffersize > (1ULL << 30)) goto address_error; break; case B43_DMA_32BIT: if ((u64)addr + buffersize > (1ULL << 32)) goto address_error; break; case B43_DMA_64BIT: /* Currently we can't have addresses beyond * 64bit in the kernel. */ break; } /* The address is OK. */ return false; address_error: /* We can't support this address. Unmap it again. */ unmap_descbuffer(ring, addr, buffersize, dma_to_device); return true; } static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb) { unsigned char *f = skb->data + ring->frameoffset; return ((f[0] & f[1] & f[2] & f[3] & f[4] & f[5] & f[6] & f[7]) == 0xFF); } static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb) { struct b43_rxhdr_fw4 *rxhdr; unsigned char *frame; /* This poisons the RX buffer to detect DMA failures. */ rxhdr = (struct b43_rxhdr_fw4 *)(skb->data); rxhdr->frame_len = 0; B43_WARN_ON(ring->rx_buffersize < ring->frameoffset + sizeof(struct b43_plcp_hdr6) + 2); frame = skb->data + ring->frameoffset; memset(frame, 0xFF, sizeof(struct b43_plcp_hdr6) + 2 /* padding */); } static int setup_rx_descbuffer(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, struct b43_dmadesc_meta *meta, gfp_t gfp_flags) { dma_addr_t dmaaddr; struct sk_buff *skb; B43_WARN_ON(ring->tx); skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); if (unlikely(!skb)) return -ENOMEM; b43_poison_rx_buffer(ring, skb); dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { /* ugh. try to realloc in zone_dma */ gfp_flags |= GFP_DMA; dev_kfree_skb_any(skb); skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); if (unlikely(!skb)) return -ENOMEM; b43_poison_rx_buffer(ring, skb); dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { b43err(ring->dev->wl, "RX DMA buffer allocation failed\n"); dev_kfree_skb_any(skb); return -EIO; } } meta->skb = skb; meta->dmaaddr = dmaaddr; ring->ops->fill_descriptor(ring, desc, dmaaddr, ring->rx_buffersize, 0, 0, 0); return 0; } /* Allocate the initial descbuffers. * This is used for an RX ring only. */ static int alloc_initial_descbuffers(struct b43_dmaring *ring) { int i, err = -ENOMEM; struct b43_dmadesc_generic *desc; struct b43_dmadesc_meta *meta; for (i = 0; i < ring->nr_slots; i++) { desc = ring->ops->idx2desc(ring, i, &meta); err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); if (err) { b43err(ring->dev->wl, "Failed to allocate initial descbuffers\n"); goto err_unwind; } } mb(); ring->used_slots = ring->nr_slots; err = 0; out: return err; err_unwind: for (i--; i >= 0; i--) { desc = ring->ops->idx2desc(ring, i, &meta); unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); dev_kfree_skb(meta->skb); } goto out; } /* Do initial setup of the DMA controller. * Reset the controller, write the ring busaddress * and switch the "enable" bit on. */ static int dmacontroller_setup(struct b43_dmaring *ring) { int err = 0; u32 value; u32 addrext; bool parity = ring->dev->dma.parity; u32 addrlo; u32 addrhi; if (ring->tx) { if (ring->type == B43_DMA_64BIT) { u64 ringbase = (u64) (ring->dmabase); addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH); value = B43_DMA64_TXENABLE; value |= (addrext << B43_DMA64_TXADDREXT_SHIFT) & B43_DMA64_TXADDREXT_MASK; if (!parity) value |= B43_DMA64_TXPARITYDISABLE; b43_dma_write(ring, B43_DMA64_TXCTL, value); b43_dma_write(ring, B43_DMA64_TXRINGLO, addrlo); b43_dma_write(ring, B43_DMA64_TXRINGHI, addrhi); } else { u32 ringbase = (u32) (ring->dmabase); addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); value = B43_DMA32_TXENABLE; value |= (addrext << B43_DMA32_TXADDREXT_SHIFT) & B43_DMA32_TXADDREXT_MASK; if (!parity) value |= B43_DMA32_TXPARITYDISABLE; b43_dma_write(ring, B43_DMA32_TXCTL, value); b43_dma_write(ring, B43_DMA32_TXRING, addrlo); } } else { err = alloc_initial_descbuffers(ring); if (err) goto out; if (ring->type == B43_DMA_64BIT) { u64 ringbase = (u64) (ring->dmabase); addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH); value = (ring->frameoffset << B43_DMA64_RXFROFF_SHIFT); value |= B43_DMA64_RXENABLE; value |= (addrext << B43_DMA64_RXADDREXT_SHIFT) & B43_DMA64_RXADDREXT_MASK; if (!parity) value |= B43_DMA64_RXPARITYDISABLE; b43_dma_write(ring, B43_DMA64_RXCTL, value); b43_dma_write(ring, B43_DMA64_RXRINGLO, addrlo); b43_dma_write(ring, B43_DMA64_RXRINGHI, addrhi); b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * sizeof(struct b43_dmadesc64)); } else { u32 ringbase = (u32) (ring->dmabase); addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); value = (ring->frameoffset << B43_DMA32_RXFROFF_SHIFT); value |= B43_DMA32_RXENABLE; value |= (addrext << B43_DMA32_RXADDREXT_SHIFT) & B43_DMA32_RXADDREXT_MASK; if (!parity) value |= B43_DMA32_RXPARITYDISABLE; b43_dma_write(ring, B43_DMA32_RXCTL, value); b43_dma_write(ring, B43_DMA32_RXRING, addrlo); b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * sizeof(struct b43_dmadesc32)); } } out: return err; } /* Shutdown the DMA controller. */ static void dmacontroller_cleanup(struct b43_dmaring *ring) { if (ring->tx) { b43_dmacontroller_tx_reset(ring->dev, ring->mmio_base, ring->type); if (ring->type == B43_DMA_64BIT) { b43_dma_write(ring, B43_DMA64_TXRINGLO, 0); b43_dma_write(ring, B43_DMA64_TXRINGHI, 0); } else b43_dma_write(ring, B43_DMA32_TXRING, 0); } else { b43_dmacontroller_rx_reset(ring->dev, ring->mmio_base, ring->type); if (ring->type == B43_DMA_64BIT) { b43_dma_write(ring, B43_DMA64_RXRINGLO, 0); b43_dma_write(ring, B43_DMA64_RXRINGHI, 0); } else b43_dma_write(ring, B43_DMA32_RXRING, 0); } } static void free_all_descbuffers(struct b43_dmaring *ring) { struct b43_dmadesc_meta *meta; int i; if (!ring->used_slots) return; for (i = 0; i < ring->nr_slots; i++) { /* get meta - ignore returned value */ ring->ops->idx2desc(ring, i, &meta); if (!meta->skb || b43_dma_ptr_is_poisoned(meta->skb)) { B43_WARN_ON(!ring->tx); continue; } if (ring->tx) { unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); } else { unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); } free_descriptor_buffer(ring, meta); } } static enum b43_dmatype b43_engine_type(struct b43_wldev *dev) { u32 tmp; u16 mmio_base; switch (dev->dev->bus_type) { #ifdef CONFIG_B43_BCMA case B43_BUS_BCMA: tmp = bcma_aread32(dev->dev->bdev, BCMA_IOST); if (tmp & BCMA_IOST_DMA64) return B43_DMA_64BIT; break; #endif #ifdef CONFIG_B43_SSB case B43_BUS_SSB: tmp = ssb_read32(dev->dev->sdev, SSB_TMSHIGH); if (tmp & SSB_TMSHIGH_DMA64) return B43_DMA_64BIT; break; #endif } mmio_base = b43_dmacontroller_base(0, 0); b43_write32(dev, mmio_base + B43_DMA32_TXCTL, B43_DMA32_TXADDREXT_MASK); tmp = b43_read32(dev, mmio_base + B43_DMA32_TXCTL); if (tmp & B43_DMA32_TXADDREXT_MASK) return B43_DMA_32BIT; return B43_DMA_30BIT; } /* Main initialization function. */ static struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, int controller_index, int for_tx, enum b43_dmatype type) { struct b43_dmaring *ring; int i, err; dma_addr_t dma_test; ring = kzalloc(sizeof(*ring), GFP_KERNEL); if (!ring) goto out; ring->nr_slots = B43_RXRING_SLOTS; if (for_tx) ring->nr_slots = B43_TXRING_SLOTS; ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta), GFP_KERNEL); if (!ring->meta) goto err_kfree_ring; for (i = 0; i < ring->nr_slots; i++) ring->meta->skb = B43_DMA_PTR_POISON; ring->type = type; ring->dev = dev; ring->mmio_base = b43_dmacontroller_base(type, controller_index); ring->index = controller_index; if (type == B43_DMA_64BIT) ring->ops = &dma64_ops; else ring->ops = &dma32_ops; if (for_tx) { ring->tx = true; ring->current_slot = -1; } else { if (ring->index == 0) { switch (dev->fw.hdr_format) { case B43_FW_HDR_598: ring->rx_buffersize = B43_DMA0_RX_FW598_BUFSIZE; ring->frameoffset = B43_DMA0_RX_FW598_FO; break; case B43_FW_HDR_410: case B43_FW_HDR_351: ring->rx_buffersize = B43_DMA0_RX_FW351_BUFSIZE; ring->frameoffset = B43_DMA0_RX_FW351_FO; break; } } else B43_WARN_ON(1); } #ifdef CONFIG_B43_DEBUG ring->last_injected_overflow = jiffies; #endif if (for_tx) { /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */ BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0); ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, b43_txhdr_size(dev), GFP_KERNEL); if (!ring->txhdr_cache) goto err_kfree_meta; /* test for ability to dma to txhdr_cache */ dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache, b43_txhdr_size(dev), DMA_TO_DEVICE); if (b43_dma_mapping_error(ring, dma_test, b43_txhdr_size(dev), 1)) { /* ugh realloc */ kfree(ring->txhdr_cache); ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, b43_txhdr_size(dev), GFP_KERNEL | GFP_DMA); if (!ring->txhdr_cache) goto err_kfree_meta; dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache, b43_txhdr_size(dev), DMA_TO_DEVICE); if (b43_dma_mapping_error(ring, dma_test, b43_txhdr_size(dev), 1)) { b43err(dev->wl, "TXHDR DMA allocation failed\n"); goto err_kfree_txhdr_cache; } } dma_unmap_single(dev->dev->dma_dev, dma_test, b43_txhdr_size(dev), DMA_TO_DEVICE); } err = alloc_ringmemory(ring); if (err) goto err_kfree_txhdr_cache; err = dmacontroller_setup(ring); if (err) goto err_free_ringmemory; out: return ring; err_free_ringmemory: free_ringmemory(ring); err_kfree_txhdr_cache: kfree(ring->txhdr_cache); err_kfree_meta: kfree(ring->meta); err_kfree_ring: kfree(ring); ring = NULL; 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, const char *ringname) { if (!ring) return; #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. */ dmacontroller_cleanup(ring); free_all_descbuffers(ring); free_ringmemory(ring); kfree(ring->txhdr_cache); kfree(ring->meta); 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; 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); } /* Some hardware with 64-bit DMA seems to be bugged and looks for translation * bit in low address word instead of high one. */ static bool b43_dma_translation_in_low_word(struct b43_wldev *dev, enum b43_dmatype type) { if (type != B43_DMA_64BIT) return true; #ifdef CONFIG_B43_SSB if (dev->dev->bus_type == B43_BUS_SSB && dev->dev->sdev->bus->bustype == SSB_BUSTYPE_PCI && !(pci_is_pcie(dev->dev->sdev->bus->host_pci) && ssb_read32(dev->dev->sdev, SSB_TMSHIGH) & SSB_TMSHIGH_DMA64)) return true; #endif return false; } int b43_dma_init(struct b43_wldev *dev) { struct b43_dma *dma = &dev->dma; enum b43_dmatype type = b43_engine_type(dev); int err; err = dma_set_mask_and_coherent(dev->dev->dma_dev, DMA_BIT_MASK(type)); if (err) { b43err(dev->wl, "The machine/kernel does not support " "the required %u-bit DMA mask\n", type); return err; } switch (dev->dev->bus_type) { #ifdef CONFIG_B43_BCMA case B43_BUS_BCMA: dma->translation = bcma_core_dma_translation(dev->dev->bdev); break; #endif #ifdef CONFIG_B43_SSB case B43_BUS_SSB: dma->translation = ssb_dma_translation(dev->dev->sdev); break; #endif } dma->translation_in_low = b43_dma_translation_in_low_word(dev, type); dma->parity = true; #ifdef CONFIG_B43_BCMA /* TODO: find out which SSB devices need disabling parity */ if (dev->dev->bus_type == B43_BUS_BCMA) dma->parity = false; #endif err = -ENOMEM; /* setup TX DMA channels. */ dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type); if (!dma->tx_ring_AC_BK) goto out; dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type); if (!dma->tx_ring_AC_BE) goto err_destroy_bk; dma->tx_ring_AC_VI = b43_setup_dmaring(dev, 2, 1, type); if (!dma->tx_ring_AC_VI) goto err_destroy_be; dma->tx_ring_AC_VO = b43_setup_dmaring(dev, 3, 1, type); if (!dma->tx_ring_AC_VO) goto err_destroy_vi; dma->tx_ring_mcast = b43_setup_dmaring(dev, 4, 1, type); if (!dma->tx_ring_mcast) goto err_destroy_vo; /* setup RX DMA channel. */ dma->rx_ring = b43_setup_dmaring(dev, 0, 0, type); if (!dma->rx_ring) goto err_destroy_mcast; /* No support for the TX status DMA ring. */ B43_WARN_ON(dev->dev->core_rev < 5); b43dbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type); err = 0; out: return err; 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; /* Use the upper 4 bits of the cookie as * DMA controller ID and store the slot number * 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. */ cookie = (((u16)ring->index + 1) << 12); B43_WARN_ON(slot & ~0x0FFF); cookie |= (u16)slot; return cookie; } /* Inspect a cookie and find out to which controller/slot it belongs. */ static struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot) { struct b43_dma *dma = &dev->dma; struct b43_dmaring *ring = NULL; switch (cookie & 0xF000) { case 0x1000: ring = dma->tx_ring_AC_BK; break; case 0x2000: ring = dma->tx_ring_AC_BE; break; case 0x3000: ring = dma->tx_ring_AC_VI; break; case 0x4000: ring = dma->tx_ring_AC_VO; break; case 0x5000: ring = dma->tx_ring_mcast; break; } *slot = (cookie & 0x0FFF); if (unlikely(!ring || *slot < 0 || *slot >= ring->nr_slots)) { b43dbg(dev->wl, "TX-status contains " "invalid cookie: 0x%04X\n", cookie); return NULL; } return ring; } static int dma_tx_fragment(struct b43_dmaring *ring, struct sk_buff *skb) { const struct b43_dma_ops *ops = ring->ops; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct b43_private_tx_info *priv_info = b43_get_priv_tx_info(info); u8 *header; int slot, old_top_slot, old_used_slots; int err; struct b43_dmadesc_generic *desc; struct b43_dmadesc_meta *meta; struct b43_dmadesc_meta *meta_hdr; u16 cookie; size_t hdrsize = b43_txhdr_size(ring->dev); /* Important note: If the number of used DMA slots per TX frame * is changed here, the TX_SLOTS_PER_FRAME definition at the top of * the file has to be updated, too! */ old_top_slot = ring->current_slot; old_used_slots = ring->used_slots; /* Get a slot for the header. */ slot = request_slot(ring); desc = ops->idx2desc(ring, slot, &meta_hdr); memset(meta_hdr, 0, sizeof(*meta_hdr)); header = &(ring->txhdr_cache[(slot / TX_SLOTS_PER_FRAME) * hdrsize]); cookie = generate_cookie(ring, slot); err = b43_generate_txhdr(ring->dev, header, skb, info, cookie); if (unlikely(err)) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; return err; } meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, hdrsize, 1); if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize, 1)) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; return -EIO; } ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, hdrsize, 1, 0, 0); /* Get a slot for the payload. */ slot = request_slot(ring); desc = ops->idx2desc(ring, slot, &meta); memset(meta, 0, sizeof(*meta)); meta->skb = skb; meta->is_last_fragment = true; priv_info->bouncebuffer = NULL; meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); /* create a bounce buffer in zone_dma on mapping failure. */ if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { priv_info->bouncebuffer = kmemdup(skb->data, skb->len, GFP_ATOMIC | GFP_DMA); if (!priv_info->bouncebuffer) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; err = -ENOMEM; goto out_unmap_hdr; } meta->dmaaddr = map_descbuffer(ring, priv_info->bouncebuffer, skb->len, 1); if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { kfree(priv_info->bouncebuffer); priv_info->bouncebuffer = NULL; ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; err = -EIO; goto out_unmap_hdr; } } ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1); if (info->flags & IEEE80211_TX_CTL_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_unmap_hdr: unmap_descbuffer(ring, meta_hdr->dmaaddr, hdrsize, 1); return err; } static inline int should_inject_overflow(struct b43_dmaring *ring) { #ifdef CONFIG_B43_DEBUG if (unlikely(b43_debug(ring->dev, B43_DBG_DMAOVERFLOW))) { /* Check if we should inject another ringbuffer overflow * to test handling of this situation in the stack. */ unsigned long next_overflow; next_overflow = ring->last_injected_overflow + HZ; if (time_after(jiffies, next_overflow)) { ring->last_injected_overflow = jiffies; b43dbg(ring->dev->wl, "Injecting TX ring overflow on " "DMA controller %d\n", ring->index); return 1; } } #endif /* CONFIG_B43_DEBUG */ 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 (dev->qos_enabled) { /* 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 b43_dmaring *ring; struct ieee80211_hdr *hdr; int err = 0; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); hdr = (struct ieee80211_hdr *)skb->data; if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { /* The multicast ring will be sent after the DTIM */ 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 = select_ring_by_priority( dev, skb_get_queue_mapping(skb)); } B43_WARN_ON(!ring->tx); if (unlikely(ring->stopped)) { /* We get here only because of a bug in mac80211. * Because of a race, one packet may be queued after * the queue is stopped, thus we got called when we shouldn't. * For now, just refuse the transmit. */ if (b43_debug(dev, B43_DBG_DMAVERBOSE)) b43err(dev->wl, "Packet after queue stopped\n"); err = -ENOSPC; goto out; } if (WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME)) { /* If we get here, we have a real error with the queue * full, but queues not stopped. */ b43err(dev->wl, "DMA queue overflow\n"); err = -ENOSPC; goto out; } /* 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 = skb_get_queue_mapping(skb); err = dma_tx_fragment(ring, skb); if (unlikely(err == -ENOKEY)) { /* Drop this packet, as we don't have the encryption key * anymore and must not transmit it unencrypted. */ ieee80211_free_txskb(dev->wl->hw, skb); err = 0; goto out; } if (unlikely(err)) { b43err(dev->wl, "DMA tx mapping failure\n"); goto out; } if ((free_slots(ring) < TX_SLOTS_PER_FRAME) || should_inject_overflow(ring)) { /* This TX ring is full. */ unsigned int skb_mapping = skb_get_queue_mapping(skb); b43_stop_queue(dev, skb_mapping); dev->wl->tx_queue_stopped[skb_mapping] = true; ring->stopped = true; if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index); } } out: return err; } void b43_dma_handle_txstatus(struct b43_wldev *dev, const struct b43_txstatus *status) { const struct b43_dma_ops *ops; struct b43_dmaring *ring; struct b43_dmadesc_meta *meta; static const struct b43_txstatus fake; /* filled with 0 */ const struct b43_txstatus *txstat; int slot, firstused; bool frame_succeed; int skip; static u8 err_out1; ring = parse_cookie(dev, status->cookie, &slot); if (unlikely(!ring)) return; B43_WARN_ON(!ring->tx); /* Sanity check: TX packets are processed in-order on one ring. * Check if the slot deduced from the cookie really is the first * used slot. */ firstused = ring->current_slot - ring->used_slots + 1; if (firstused < 0) firstused = ring->nr_slots + firstused; skip = 0; if (unlikely(slot != firstused)) { /* This possibly is a firmware bug and will result in * malfunction, memory leaks and/or stall of DMA functionality. */ if (slot == next_slot(ring, next_slot(ring, firstused))) { /* If a single header/data pair was missed, skip over * the first two slots in an attempt to recover. */ slot = firstused; skip = 2; if (!err_out1) { /* Report the error once. */ b43dbg(dev->wl, "Skip on DMA ring %d slot %d.\n", ring->index, slot); err_out1 = 1; } } else { /* More than a single header/data pair were missed. * Report this error. If running with open-source * firmware, then reset the controller to * revive operation. */ b43dbg(dev->wl, "Out of order TX status report on DMA ring %d. Expected %d, but got %d\n", ring->index, firstused, slot); if (dev->fw.opensource) b43_controller_restart(dev, "Out of order TX"); return; } } ops = ring->ops; while (1) { B43_WARN_ON(slot < 0 || slot >= ring->nr_slots); /* get meta - ignore returned value */ ops->idx2desc(ring, slot, &meta); if (b43_dma_ptr_is_poisoned(meta->skb)) { b43dbg(dev->wl, "Poisoned TX slot %d (first=%d) " "on ring %d\n", slot, firstused, ring->index); break; } if (meta->skb) { struct b43_private_tx_info *priv_info = b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb)); unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); kfree(priv_info->bouncebuffer); priv_info->bouncebuffer = NULL; } else { unmap_descbuffer(ring, meta->dmaaddr, b43_txhdr_size(dev), 1); } if (meta->is_last_fragment) { struct ieee80211_tx_info *info; if (unlikely(!meta->skb)) { /* This is a scatter-gather fragment of a frame, * so the skb pointer must not be NULL. */ b43dbg(dev->wl, "TX status unexpected NULL skb " "at slot %d (first=%d) on ring %d\n", slot, firstused, ring->index); break; } info = IEEE80211_SKB_CB(meta->skb); /* * Call back to inform the ieee80211 subsystem about * the status of the transmission. When skipping over * a missed TX status report, use a status structure * filled with zeros to indicate that the frame was not * sent (frame_count 0) and not acknowledged */ if (unlikely(skip)) txstat = &fake; else txstat = status; frame_succeed = b43_fill_txstatus_report(dev, info, txstat); #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(dev->wl->hw, meta->skb); /* skb will be freed by ieee80211_tx_status(). * Poison our pointer. */ meta->skb = B43_DMA_PTR_POISON; } else { /* No need to call free_descriptor_buffer here, as * this is only the txhdr, which is not allocated. */ if (unlikely(meta->skb)) { b43dbg(dev->wl, "TX status unexpected non-NULL skb " "at slot %d (first=%d) on ring %d\n", slot, firstused, ring->index); break; } } /* Everything unmapped and free'd. So it's not used anymore. */ ring->used_slots--; if (meta->is_last_fragment && !skip) { /* This is the last scatter-gather * fragment of the frame. We are done. */ break; } slot = next_slot(ring, slot); if (skip > 0) --skip; } if (ring->stopped) { B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME); ring->stopped = false; } if (dev->wl->tx_queue_stopped[ring->queue_prio]) { dev->wl->tx_queue_stopped[ring->queue_prio] = false; } else { /* If the driver queue is running wake the corresponding * mac80211 queue. */ b43_wake_queue(dev, ring->queue_prio); if (b43_debug(dev, B43_DBG_DMAVERBOSE)) { b43dbg(dev->wl, "Woke up TX ring %d\n", ring->index); } } /* Add work to the queue. */ ieee80211_queue_work(dev->wl->hw, &dev->wl->tx_work); } static void dma_rx(struct b43_dmaring *ring, int *slot) { const struct b43_dma_ops *ops = ring->ops; struct b43_dmadesc_generic *desc; struct b43_dmadesc_meta *meta; struct b43_rxhdr_fw4 *rxhdr; struct sk_buff *skb; u16 len; int err; dma_addr_t dmaaddr; desc = ops->idx2desc(ring, *slot, &meta); sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); skb = meta->skb; rxhdr = (struct b43_rxhdr_fw4 *)skb->data; len = le16_to_cpu(rxhdr->frame_len); if (len == 0) { int i = 0; do { udelay(2); barrier(); len = le16_to_cpu(rxhdr->frame_len); } while (len == 0 && i++ < 5); if (unlikely(len == 0)) { dmaaddr = meta->dmaaddr; goto drop_recycle_buffer; } } if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) { /* Something went wrong with the DMA. * The device did not touch the buffer and did not overwrite the poison. */ b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n"); dmaaddr = meta->dmaaddr; goto drop_recycle_buffer; } if (unlikely(len + ring->frameoffset > ring->rx_buffersize)) { /* The data did not fit into one descriptor buffer * and is split over multiple buffers. * This should never happen, as we try to allocate buffers * big enough. So simply ignore this packet. */ int cnt = 0; s32 tmp = len; while (1) { desc = ops->idx2desc(ring, *slot, &meta); /* recycle the descriptor buffer. */ b43_poison_rx_buffer(ring, meta->skb); sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); *slot = next_slot(ring, *slot); cnt++; tmp -= ring->rx_buffersize; if (tmp <= 0) break; } b43err(ring->dev->wl, "DMA RX buffer too small " "(len: %u, buffer: %u, nr-dropped: %d)\n", len, ring->rx_buffersize, cnt); goto drop; } dmaaddr = meta->dmaaddr; err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); if (unlikely(err)) { b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n"); goto drop_recycle_buffer; } unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); skb_put(skb, len + ring->frameoffset); skb_pull(skb, ring->frameoffset); b43_rx(ring->dev, skb, rxhdr); drop: return; drop_recycle_buffer: /* Poison and recycle the RX buffer. */ b43_poison_rx_buffer(ring, skb); sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize); } void b43_dma_handle_rx_overflow(struct b43_dmaring *ring) { int current_slot, previous_slot; B43_WARN_ON(ring->tx); /* Device has filled all buffers, drop all packets and let TCP * decrease speed. * Decrement RX index by one will let the device to see all slots * as free again */ /* *TODO: How to increase rx_drop in mac80211? */ current_slot = ring->ops->get_current_rxslot(ring); previous_slot = prev_slot(ring, current_slot); ring->ops->set_current_rxslot(ring, previous_slot); } void b43_dma_rx(struct b43_dmaring *ring) { const struct b43_dma_ops *ops = ring->ops; int slot, current_slot; int used_slots = 0; B43_WARN_ON(ring->tx); current_slot = ops->get_current_rxslot(ring); B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots)); slot = ring->current_slot; for (; slot != current_slot; slot = next_slot(ring, slot)) { dma_rx(ring, &slot); update_max_used_slots(ring, ++used_slots); } wmb(); ops->set_current_rxslot(ring, slot); ring->current_slot = slot; } static void b43_dma_tx_suspend_ring(struct b43_dmaring *ring) { B43_WARN_ON(!ring->tx); ring->ops->tx_suspend(ring); } static void b43_dma_tx_resume_ring(struct b43_dmaring *ring) { B43_WARN_ON(!ring->tx); ring->ops->tx_resume(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_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_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); } 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 = b43_engine_type(dev); mmio_base = b43_dmacontroller_base(type, engine_index); direct_fifo_rx(dev, type, mmio_base, enable); }