/* Broadcom B43legacy 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 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 "b43legacy.h" #include "dma.h" #include "main.h" #include "debugfs.h" #include "xmit.h" #include #include #include #include #include /* 32bit DMA ops. */ static struct b43legacy_dmadesc_generic *op32_idx2desc( struct b43legacy_dmaring *ring, int slot, struct b43legacy_dmadesc_meta **meta) { struct b43legacy_dmadesc32 *desc; *meta = &(ring->meta[slot]); desc = ring->descbase; desc = &(desc[slot]); return (struct b43legacy_dmadesc_generic *)desc; } static void op32_fill_descriptor(struct b43legacy_dmaring *ring, struct b43legacy_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { struct b43legacy_dmadesc32 *descbase = ring->descbase; int slot; u32 ctl; u32 addr; u32 addrext; slot = (int)(&(desc->dma32) - descbase); B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); addr = (u32)(dmaaddr & ~SSB_DMA_TRANSLATION_MASK); addrext = (u32)(dmaaddr & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; addr |= ssb_dma_translation(ring->dev->dev); ctl = (bufsize - ring->frameoffset) & B43legacy_DMA32_DCTL_BYTECNT; if (slot == ring->nr_slots - 1) ctl |= B43legacy_DMA32_DCTL_DTABLEEND; if (start) ctl |= B43legacy_DMA32_DCTL_FRAMESTART; if (end) ctl |= B43legacy_DMA32_DCTL_FRAMEEND; if (irq) ctl |= B43legacy_DMA32_DCTL_IRQ; ctl |= (addrext << B43legacy_DMA32_DCTL_ADDREXT_SHIFT) & B43legacy_DMA32_DCTL_ADDREXT_MASK; desc->dma32.control = cpu_to_le32(ctl); desc->dma32.address = cpu_to_le32(addr); } static void op32_poke_tx(struct b43legacy_dmaring *ring, int slot) { b43legacy_dma_write(ring, B43legacy_DMA32_TXINDEX, (u32)(slot * sizeof(struct b43legacy_dmadesc32))); } static void op32_tx_suspend(struct b43legacy_dmaring *ring) { b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) | B43legacy_DMA32_TXSUSPEND); } static void op32_tx_resume(struct b43legacy_dmaring *ring) { b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) & ~B43legacy_DMA32_TXSUSPEND); } static int op32_get_current_rxslot(struct b43legacy_dmaring *ring) { u32 val; val = b43legacy_dma_read(ring, B43legacy_DMA32_RXSTATUS); val &= B43legacy_DMA32_RXDPTR; return (val / sizeof(struct b43legacy_dmadesc32)); } static void op32_set_current_rxslot(struct b43legacy_dmaring *ring, int slot) { b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, (u32)(slot * sizeof(struct b43legacy_dmadesc32))); } static const struct b43legacy_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 b43legacy_dmadesc_generic *op64_idx2desc( struct b43legacy_dmaring *ring, int slot, struct b43legacy_dmadesc_meta **meta) { struct b43legacy_dmadesc64 *desc; *meta = &(ring->meta[slot]); desc = ring->descbase; desc = &(desc[slot]); return (struct b43legacy_dmadesc_generic *)desc; } static void op64_fill_descriptor(struct b43legacy_dmaring *ring, struct b43legacy_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { struct b43legacy_dmadesc64 *descbase = ring->descbase; int slot; u32 ctl0 = 0; u32 ctl1 = 0; u32 addrlo; u32 addrhi; u32 addrext; slot = (int)(&(desc->dma64) - descbase); B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); addrlo = (u32)(dmaaddr & 0xFFFFFFFF); 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); if (slot == ring->nr_slots - 1) ctl0 |= B43legacy_DMA64_DCTL0_DTABLEEND; if (start) ctl0 |= B43legacy_DMA64_DCTL0_FRAMESTART; if (end) ctl0 |= B43legacy_DMA64_DCTL0_FRAMEEND; if (irq) ctl0 |= B43legacy_DMA64_DCTL0_IRQ; ctl1 |= (bufsize - ring->frameoffset) & B43legacy_DMA64_DCTL1_BYTECNT; ctl1 |= (addrext << B43legacy_DMA64_DCTL1_ADDREXT_SHIFT) & B43legacy_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 b43legacy_dmaring *ring, int slot) { b43legacy_dma_write(ring, B43legacy_DMA64_TXINDEX, (u32)(slot * sizeof(struct b43legacy_dmadesc64))); } static void op64_tx_suspend(struct b43legacy_dmaring *ring) { b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL) | B43legacy_DMA64_TXSUSPEND); } static void op64_tx_resume(struct b43legacy_dmaring *ring) { b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, b43legacy_dma_read(ring, B43legacy_DMA64_TXCTL) & ~B43legacy_DMA64_TXSUSPEND); } static int op64_get_current_rxslot(struct b43legacy_dmaring *ring) { u32 val; val = b43legacy_dma_read(ring, B43legacy_DMA64_RXSTATUS); val &= B43legacy_DMA64_RXSTATDPTR; return (val / sizeof(struct b43legacy_dmadesc64)); } static void op64_set_current_rxslot(struct b43legacy_dmaring *ring, int slot) { b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX, (u32)(slot * sizeof(struct b43legacy_dmadesc64))); } static const struct b43legacy_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 b43legacy_dmaring *ring) { return (ring->nr_slots - ring->used_slots); } static inline int next_slot(struct b43legacy_dmaring *ring, int slot) { B43legacy_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 b43legacy_dmaring *ring, int slot) { B43legacy_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); if (slot == 0) return ring->nr_slots - 1; return slot - 1; } #ifdef CONFIG_B43LEGACY_DEBUG static void update_max_used_slots(struct b43legacy_dmaring *ring, int current_used_slots) { if (current_used_slots <= ring->max_used_slots) return; ring->max_used_slots = current_used_slots; if (b43legacy_debug(ring->dev, B43legacy_DBG_DMAVERBOSE)) b43legacydbg(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 b43legacy_dmaring *ring, int current_used_slots) { } #endif /* DEBUG */ /* Request a slot for usage. */ static inline int request_slot(struct b43legacy_dmaring *ring) { int slot; B43legacy_WARN_ON(!ring->tx); B43legacy_WARN_ON(ring->stopped); B43legacy_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; } /* Mac80211-queue to b43legacy-ring mapping */ static struct b43legacy_dmaring *priority_to_txring( struct b43legacy_wldev *dev, int queue_priority) { struct b43legacy_dmaring *ring; /*FIXME: For now we always run on TX-ring-1 */ return dev->dma.tx_ring1; /* 0 = highest priority */ switch (queue_priority) { default: B43legacy_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; case 4: ring = dev->dma.tx_ring4; break; case 5: ring = dev->dma.tx_ring5; break; } return ring; } /* Bcm4301-ring to mac80211-queue mapping */ static inline int txring_to_priority(struct b43legacy_dmaring *ring) { static const u8 idx_to_prio[] = { 3, 2, 1, 0, 4, 5, }; /*FIXME: have only one queue, for now */ return 0; return idx_to_prio[ring->index]; } static u16 b43legacy_dmacontroller_base(enum b43legacy_dmatype type, int controller_idx) { static const u16 map64[] = { B43legacy_MMIO_DMA64_BASE0, B43legacy_MMIO_DMA64_BASE1, B43legacy_MMIO_DMA64_BASE2, B43legacy_MMIO_DMA64_BASE3, B43legacy_MMIO_DMA64_BASE4, B43legacy_MMIO_DMA64_BASE5, }; static const u16 map32[] = { B43legacy_MMIO_DMA32_BASE0, B43legacy_MMIO_DMA32_BASE1, B43legacy_MMIO_DMA32_BASE2, B43legacy_MMIO_DMA32_BASE3, B43legacy_MMIO_DMA32_BASE4, B43legacy_MMIO_DMA32_BASE5, }; if (type == B43legacy_DMA_64BIT) { B43legacy_WARN_ON(!(controller_idx >= 0 && controller_idx < ARRAY_SIZE(map64))); return map64[controller_idx]; } B43legacy_WARN_ON(!(controller_idx >= 0 && controller_idx < ARRAY_SIZE(map32))); return map32[controller_idx]; } static inline dma_addr_t map_descbuffer(struct b43legacy_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 b43legacy_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 b43legacy_dmaring *ring, dma_addr_t addr, size_t len) { B43legacy_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 b43legacy_dmaring *ring, dma_addr_t addr, size_t len) { B43legacy_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 b43legacy_dmaring *ring, struct b43legacy_dmadesc_meta *meta, int irq_context) { if (meta->skb) { if (irq_context) dev_kfree_skb_irq(meta->skb); else dev_kfree_skb(meta->skb); meta->skb = NULL; } } static int alloc_ringmemory(struct b43legacy_dmaring *ring) { struct device *dma_dev = ring->dev->dev->dma_dev; ring->descbase = dma_alloc_coherent(dma_dev, B43legacy_DMA_RINGMEMSIZE, &(ring->dmabase), GFP_KERNEL); if (!ring->descbase) { b43legacyerr(ring->dev->wl, "DMA ringmemory allocation" " failed\n"); return -ENOMEM; } memset(ring->descbase, 0, B43legacy_DMA_RINGMEMSIZE); return 0; } static void free_ringmemory(struct b43legacy_dmaring *ring) { struct device *dma_dev = ring->dev->dev->dma_dev; dma_free_coherent(dma_dev, B43legacy_DMA_RINGMEMSIZE, ring->descbase, ring->dmabase); } /* Reset the RX DMA channel */ static int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev, u16 mmio_base, enum b43legacy_dmatype type) { int i; u32 value; u16 offset; might_sleep(); offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_RXCTL : B43legacy_DMA32_RXCTL; b43legacy_write32(dev, mmio_base + offset, 0); for (i = 0; i < 10; i++) { offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_RXSTATUS : B43legacy_DMA32_RXSTATUS; value = b43legacy_read32(dev, mmio_base + offset); if (type == B43legacy_DMA_64BIT) { value &= B43legacy_DMA64_RXSTAT; if (value == B43legacy_DMA64_RXSTAT_DISABLED) { i = -1; break; } } else { value &= B43legacy_DMA32_RXSTATE; if (value == B43legacy_DMA32_RXSTAT_DISABLED) { i = -1; break; } } msleep(1); } if (i != -1) { b43legacyerr(dev->wl, "DMA RX reset timed out\n"); return -ENODEV; } return 0; } /* Reset the RX DMA channel */ static int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev, u16 mmio_base, enum b43legacy_dmatype type) { int i; u32 value; u16 offset; might_sleep(); for (i = 0; i < 10; i++) { offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS; value = b43legacy_read32(dev, mmio_base + offset); if (type == B43legacy_DMA_64BIT) { value &= B43legacy_DMA64_TXSTAT; if (value == B43legacy_DMA64_TXSTAT_DISABLED || value == B43legacy_DMA64_TXSTAT_IDLEWAIT || value == B43legacy_DMA64_TXSTAT_STOPPED) break; } else { value &= B43legacy_DMA32_TXSTATE; if (value == B43legacy_DMA32_TXSTAT_DISABLED || value == B43legacy_DMA32_TXSTAT_IDLEWAIT || value == B43legacy_DMA32_TXSTAT_STOPPED) break; } msleep(1); } offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_TXCTL : B43legacy_DMA32_TXCTL; b43legacy_write32(dev, mmio_base + offset, 0); for (i = 0; i < 10; i++) { offset = (type == B43legacy_DMA_64BIT) ? B43legacy_DMA64_TXSTATUS : B43legacy_DMA32_TXSTATUS; value = b43legacy_read32(dev, mmio_base + offset); if (type == B43legacy_DMA_64BIT) { value &= B43legacy_DMA64_TXSTAT; if (value == B43legacy_DMA64_TXSTAT_DISABLED) { i = -1; break; } } else { value &= B43legacy_DMA32_TXSTATE; if (value == B43legacy_DMA32_TXSTAT_DISABLED) { i = -1; break; } } msleep(1); } if (i != -1) { b43legacyerr(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 b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring, dma_addr_t addr, size_t buffersize, bool dma_to_device) { if (unlikely(dma_mapping_error(addr))) return 1; switch (ring->type) { case B43legacy_DMA_30BIT: if ((u64)addr + buffersize > (1ULL << 30)) goto address_error; break; case B43legacy_DMA_32BIT: if ((u64)addr + buffersize > (1ULL << 32)) goto address_error; break; case B43legacy_DMA_64BIT: /* Currently we can't have addresses beyond 64 bits in the kernel. */ break; } /* The address is OK. */ return 0; address_error: /* We can't support this address. Unmap it again. */ unmap_descbuffer(ring, addr, buffersize, dma_to_device); return 1; } static int setup_rx_descbuffer(struct b43legacy_dmaring *ring, struct b43legacy_dmadesc_generic *desc, struct b43legacy_dmadesc_meta *meta, gfp_t gfp_flags) { struct b43legacy_rxhdr_fw3 *rxhdr; struct b43legacy_hwtxstatus *txstat; dma_addr_t dmaaddr; struct sk_buff *skb; B43legacy_WARN_ON(ring->tx); skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); if (unlikely(!skb)) return -ENOMEM; dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); if (b43legacy_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; dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); } if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { 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); rxhdr = (struct b43legacy_rxhdr_fw3 *)(skb->data); rxhdr->frame_len = 0; txstat = (struct b43legacy_hwtxstatus *)(skb->data); txstat->cookie = 0; return 0; } /* Allocate the initial descbuffers. * This is used for an RX ring only. */ static int alloc_initial_descbuffers(struct b43legacy_dmaring *ring) { int i; int err = -ENOMEM; struct b43legacy_dmadesc_generic *desc; struct b43legacy_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) { b43legacyerr(ring->dev->wl, "Failed to allocate initial descbuffers\n"); goto err_unwind; } } mb(); /* all descbuffer setup before next line */ 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 b43legacy_dmaring *ring) { int err = 0; u32 value; u32 addrext; u32 trans = ssb_dma_translation(ring->dev->dev); if (ring->tx) { if (ring->type == B43legacy_DMA_64BIT) { u64 ringbase = (u64)(ring->dmabase); addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; value = B43legacy_DMA64_TXENABLE; value |= (addrext << B43legacy_DMA64_TXADDREXT_SHIFT) & B43legacy_DMA64_TXADDREXT_MASK; b43legacy_dma_write(ring, B43legacy_DMA64_TXCTL, value); b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, (ringbase & 0xFFFFFFFF)); b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) | trans); } else { u32 ringbase = (u32)(ring->dmabase); addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; value = B43legacy_DMA32_TXENABLE; value |= (addrext << B43legacy_DMA32_TXADDREXT_SHIFT) & B43legacy_DMA32_TXADDREXT_MASK; b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, value); b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, (ringbase & ~SSB_DMA_TRANSLATION_MASK) | trans); } } else { err = alloc_initial_descbuffers(ring); if (err) goto out; if (ring->type == B43legacy_DMA_64BIT) { u64 ringbase = (u64)(ring->dmabase); addrext = ((ringbase >> 32) & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; value = (ring->frameoffset << B43legacy_DMA64_RXFROFF_SHIFT); value |= B43legacy_DMA64_RXENABLE; value |= (addrext << B43legacy_DMA64_RXADDREXT_SHIFT) & B43legacy_DMA64_RXADDREXT_MASK; b43legacy_dma_write(ring, B43legacy_DMA64_RXCTL, value); b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, (ringbase & 0xFFFFFFFF)); b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) | trans); b43legacy_dma_write(ring, B43legacy_DMA64_RXINDEX, 200); } else { u32 ringbase = (u32)(ring->dmabase); addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; value = (ring->frameoffset << B43legacy_DMA32_RXFROFF_SHIFT); value |= B43legacy_DMA32_RXENABLE; value |= (addrext << B43legacy_DMA32_RXADDREXT_SHIFT) & B43legacy_DMA32_RXADDREXT_MASK; b43legacy_dma_write(ring, B43legacy_DMA32_RXCTL, value); b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, (ringbase & ~SSB_DMA_TRANSLATION_MASK) | trans); b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, 200); } } out: return err; } /* Shutdown the DMA controller. */ static void dmacontroller_cleanup(struct b43legacy_dmaring *ring) { if (ring->tx) { b43legacy_dmacontroller_tx_reset(ring->dev, ring->mmio_base, ring->type); if (ring->type == B43legacy_DMA_64BIT) { b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGLO, 0); b43legacy_dma_write(ring, B43legacy_DMA64_TXRINGHI, 0); } else b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0); } else { b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base, ring->type); if (ring->type == B43legacy_DMA_64BIT) { b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGLO, 0); b43legacy_dma_write(ring, B43legacy_DMA64_RXRINGHI, 0); } else b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0); } } static void free_all_descbuffers(struct b43legacy_dmaring *ring) { struct b43legacy_dmadesc_generic *desc; struct b43legacy_dmadesc_meta *meta; int i; if (!ring->used_slots) return; for (i = 0; i < ring->nr_slots; i++) { desc = ring->ops->idx2desc(ring, i, &meta); if (!meta->skb) { B43legacy_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, 0); } } static u64 supported_dma_mask(struct b43legacy_wldev *dev) { u32 tmp; u16 mmio_base; tmp = b43legacy_read32(dev, SSB_TMSHIGH); if (tmp & SSB_TMSHIGH_DMA64) return DMA_64BIT_MASK; mmio_base = b43legacy_dmacontroller_base(0, 0); b43legacy_write32(dev, mmio_base + B43legacy_DMA32_TXCTL, B43legacy_DMA32_TXADDREXT_MASK); tmp = b43legacy_read32(dev, mmio_base + B43legacy_DMA32_TXCTL); if (tmp & B43legacy_DMA32_TXADDREXT_MASK) return DMA_32BIT_MASK; return DMA_30BIT_MASK; } /* Main initialization function. */ static struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev, int controller_index, int for_tx, enum b43legacy_dmatype type) { struct b43legacy_dmaring *ring; int err; int nr_slots; dma_addr_t dma_test; ring = kzalloc(sizeof(*ring), GFP_KERNEL); if (!ring) goto out; ring->type = type; nr_slots = B43legacy_RXRING_SLOTS; if (for_tx) nr_slots = B43legacy_TXRING_SLOTS; ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta), GFP_KERNEL); if (!ring->meta) goto err_kfree_ring; if (for_tx) { ring->txhdr_cache = kcalloc(nr_slots, sizeof(struct b43legacy_txhdr_fw3), 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, sizeof(struct b43legacy_txhdr_fw3), DMA_TO_DEVICE); if (b43legacy_dma_mapping_error(ring, dma_test, sizeof(struct b43legacy_txhdr_fw3), 1)) { /* ugh realloc */ kfree(ring->txhdr_cache); ring->txhdr_cache = kcalloc(nr_slots, sizeof(struct b43legacy_txhdr_fw3), GFP_KERNEL | GFP_DMA); if (!ring->txhdr_cache) goto err_kfree_meta; dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache, sizeof(struct b43legacy_txhdr_fw3), DMA_TO_DEVICE); if (b43legacy_dma_mapping_error(ring, dma_test, sizeof(struct b43legacy_txhdr_fw3), 1)) goto err_kfree_txhdr_cache; } dma_unmap_single(dev->dev->dma_dev, dma_test, sizeof(struct b43legacy_txhdr_fw3), DMA_TO_DEVICE); } ring->dev = dev; ring->nr_slots = nr_slots; ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index); ring->index = controller_index; if (type == B43legacy_DMA_64BIT) ring->ops = &dma64_ops; else ring->ops = &dma32_ops; if (for_tx) { ring->tx = 1; ring->current_slot = -1; } else { if (ring->index == 0) { ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE; ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET; } else if (ring->index == 3) { ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE; ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET; } else B43legacy_WARN_ON(1); } spin_lock_init(&ring->lock); #ifdef CONFIG_B43LEGACY_DEBUG ring->last_injected_overflow = jiffies; #endif 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; } /* Main cleanup function. */ static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring) { if (!ring) return; b43legacydbg(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); /* 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); } void b43legacy_dma_free(struct b43legacy_wldev *dev) { struct b43legacy_dma *dma; if (b43legacy_using_pio(dev)) return; dma = &dev->dma; b43legacy_destroy_dmaring(dma->rx_ring3); dma->rx_ring3 = NULL; b43legacy_destroy_dmaring(dma->rx_ring0); dma->rx_ring0 = NULL; b43legacy_destroy_dmaring(dma->tx_ring5); dma->tx_ring5 = NULL; b43legacy_destroy_dmaring(dma->tx_ring4); dma->tx_ring4 = NULL; b43legacy_destroy_dmaring(dma->tx_ring3); dma->tx_ring3 = NULL; b43legacy_destroy_dmaring(dma->tx_ring2); dma->tx_ring2 = NULL; b43legacy_destroy_dmaring(dma->tx_ring1); dma->tx_ring1 = NULL; b43legacy_destroy_dmaring(dma->tx_ring0); dma->tx_ring0 = NULL; } int b43legacy_dma_init(struct b43legacy_wldev *dev) { struct b43legacy_dma *dma = &dev->dma; struct b43legacy_dmaring *ring; int err; u64 dmamask; enum b43legacy_dmatype type; dmamask = supported_dma_mask(dev); switch (dmamask) { default: B43legacy_WARN_ON(1); case DMA_30BIT_MASK: type = B43legacy_DMA_30BIT; break; case DMA_32BIT_MASK: type = B43legacy_DMA_32BIT; break; case DMA_64BIT_MASK: type = B43legacy_DMA_64BIT; break; } err = ssb_dma_set_mask(dev->dev, dmamask); if (err) { #ifdef CONFIG_B43LEGACY_PIO b43legacywarn(dev->wl, "DMA for this device not supported. " "Falling back to PIO\n"); dev->__using_pio = 1; return -EAGAIN; #else b43legacyerr(dev->wl, "DMA for this device not supported and " "no PIO support compiled in\n"); return -EOPNOTSUPP; #endif } err = -ENOMEM; /* setup TX DMA channels. */ ring = b43legacy_setup_dmaring(dev, 0, 1, type); if (!ring) goto out; dma->tx_ring0 = ring; ring = b43legacy_setup_dmaring(dev, 1, 1, type); if (!ring) goto err_destroy_tx0; dma->tx_ring1 = ring; ring = b43legacy_setup_dmaring(dev, 2, 1, type); if (!ring) goto err_destroy_tx1; dma->tx_ring2 = ring; ring = b43legacy_setup_dmaring(dev, 3, 1, type); if (!ring) goto err_destroy_tx2; dma->tx_ring3 = ring; ring = b43legacy_setup_dmaring(dev, 4, 1, type); if (!ring) goto err_destroy_tx3; dma->tx_ring4 = ring; ring = b43legacy_setup_dmaring(dev, 5, 1, type); if (!ring) goto err_destroy_tx4; dma->tx_ring5 = ring; /* setup RX DMA channels. */ ring = b43legacy_setup_dmaring(dev, 0, 0, type); if (!ring) goto err_destroy_tx5; dma->rx_ring0 = ring; if (dev->dev->id.revision < 5) { ring = b43legacy_setup_dmaring(dev, 3, 0, type); if (!ring) goto err_destroy_rx0; dma->rx_ring3 = ring; } b43legacydbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type); err = 0; out: return err; err_destroy_rx0: b43legacy_destroy_dmaring(dma->rx_ring0); dma->rx_ring0 = NULL; err_destroy_tx5: b43legacy_destroy_dmaring(dma->tx_ring5); dma->tx_ring5 = NULL; err_destroy_tx4: b43legacy_destroy_dmaring(dma->tx_ring4); dma->tx_ring4 = NULL; err_destroy_tx3: b43legacy_destroy_dmaring(dma->tx_ring3); dma->tx_ring3 = NULL; err_destroy_tx2: b43legacy_destroy_dmaring(dma->tx_ring2); dma->tx_ring2 = NULL; err_destroy_tx1: b43legacy_destroy_dmaring(dma->tx_ring1); dma->tx_ring1 = NULL; err_destroy_tx0: b43legacy_destroy_dmaring(dma->tx_ring0); dma->tx_ring0 = NULL; goto out; } /* Generate a cookie for the TX header. */ static u16 generate_cookie(struct b43legacy_dmaring *ring, int slot) { u16 cookie = 0x1000; /* 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. */ switch (ring->index) { case 0: cookie = 0xA000; break; case 1: cookie = 0xB000; break; case 2: cookie = 0xC000; break; case 3: cookie = 0xD000; break; case 4: cookie = 0xE000; break; case 5: cookie = 0xF000; break; } B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000)); cookie |= (u16)slot; return cookie; } /* Inspect a cookie and find out to which controller/slot it belongs. */ static struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev, u16 cookie, int *slot) { struct b43legacy_dma *dma = &dev->dma; struct b43legacy_dmaring *ring = NULL; switch (cookie & 0xF000) { case 0xA000: ring = dma->tx_ring0; break; case 0xB000: ring = dma->tx_ring1; break; case 0xC000: ring = dma->tx_ring2; break; case 0xD000: ring = dma->tx_ring3; break; case 0xE000: ring = dma->tx_ring4; break; case 0xF000: ring = dma->tx_ring5; break; default: B43legacy_WARN_ON(1); } *slot = (cookie & 0x0FFF); B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots)); return ring; } static int dma_tx_fragment(struct b43legacy_dmaring *ring, struct sk_buff *skb) { const struct b43legacy_dma_ops *ops = ring->ops; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); u8 *header; int slot, old_top_slot, old_used_slots; int err; struct b43legacy_dmadesc_generic *desc; struct b43legacy_dmadesc_meta *meta; struct b43legacy_dmadesc_meta *meta_hdr; struct sk_buff *bounce_skb; #define SLOTS_PER_PACKET 2 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); 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 * sizeof( struct b43legacy_txhdr_fw3)]); err = b43legacy_generate_txhdr(ring->dev, header, skb->data, skb->len, info, generate_cookie(ring, slot)); 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, sizeof(struct b43legacy_txhdr_fw3), 1); if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr, sizeof(struct b43legacy_txhdr_fw3), 1)) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; return -EIO; } ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr, sizeof(struct b43legacy_txhdr_fw3), 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 = 1; meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); /* create a bounce buffer in zone_dma on mapping failure. */ if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); if (!bounce_skb) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; err = -ENOMEM; goto out_unmap_hdr; } memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len); dev_kfree_skb_any(skb); skb = bounce_skb; meta->skb = skb; meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { ring->current_slot = old_top_slot; ring->used_slots = old_used_slots; err = -EIO; goto out_free_bounce; } } ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1); wmb(); /* previous stuff MUST be done */ /* Now transfer the whole frame. */ ops->poke_tx(ring, next_slot(ring, slot)); return 0; out_free_bounce: dev_kfree_skb_any(skb); out_unmap_hdr: unmap_descbuffer(ring, meta_hdr->dmaaddr, sizeof(struct b43legacy_txhdr_fw3), 1); return err; } static inline int should_inject_overflow(struct b43legacy_dmaring *ring) { #ifdef CONFIG_B43LEGACY_DEBUG if (unlikely(b43legacy_debug(ring->dev, B43legacy_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; b43legacydbg(ring->dev->wl, "Injecting TX ring overflow on " "DMA controller %d\n", ring->index); return 1; } } #endif /* CONFIG_B43LEGACY_DEBUG */ return 0; } int b43legacy_dma_tx(struct b43legacy_wldev *dev, struct sk_buff *skb) { struct b43legacy_dmaring *ring; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); int err = 0; unsigned long flags; ring = priority_to_txring(dev, info->queue); spin_lock_irqsave(&ring->lock, flags); B43legacy_WARN_ON(!ring->tx); if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) { b43legacywarn(dev->wl, "DMA queue overflow\n"); err = -ENOSPC; goto out_unlock; } /* Check if the queue was stopped in mac80211, * but we got called nevertheless. * That would be a mac80211 bug. */ B43legacy_BUG_ON(ring->stopped); 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. */ dev_kfree_skb_any(skb); err = 0; goto out_unlock; } if (unlikely(err)) { b43legacyerr(dev->wl, "DMA tx mapping failure\n"); goto out_unlock; } ring->nr_tx_packets++; 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)); ring->stopped = 1; if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) b43legacydbg(dev->wl, "Stopped TX ring %d\n", ring->index); } out_unlock: spin_unlock_irqrestore(&ring->lock, flags); return err; } void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev, const struct b43legacy_txstatus *status) { const struct b43legacy_dma_ops *ops; struct b43legacy_dmaring *ring; struct b43legacy_dmadesc_generic *desc; struct b43legacy_dmadesc_meta *meta; int slot; ring = parse_cookie(dev, status->cookie, &slot); if (unlikely(!ring)) return; B43legacy_WARN_ON(!irqs_disabled()); spin_lock(&ring->lock); B43legacy_WARN_ON(!ring->tx); ops = ring->ops; while (1) { B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); desc = ops->idx2desc(ring, slot, &meta); if (meta->skb) unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); else unmap_descbuffer(ring, meta->dmaaddr, sizeof(struct b43legacy_txhdr_fw3), 1); if (meta->is_last_fragment) { struct ieee80211_tx_info *info; BUG_ON(!meta->skb); info = IEEE80211_SKB_CB(meta->skb); /* Call back to inform the ieee80211 subsystem about the * status of the transmission. * Some fields of txstat are already filled in dma_tx(). */ memset(&info->status, 0, sizeof(info->status)); if (status->acked) { info->flags |= IEEE80211_TX_STAT_ACK; } else { if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) info->status.excessive_retries = 1; } if (status->frame_count == 0) { /* The frame was not transmitted at all. */ info->status.retry_count = 0; } else info->status.retry_count = status->frame_count - 1; ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb); /* skb is freed by ieee80211_tx_status_irqsafe() */ meta->skb = NULL; } else { /* No need to call free_descriptor_buffer here, as * this is only the txhdr, which is not allocated. */ B43legacy_WARN_ON(meta->skb != NULL); } /* Everything unmapped and free'd. So it's not used anymore. */ ring->used_slots--; if (meta->is_last_fragment) break; slot = next_slot(ring, slot); } dev->stats.last_tx = jiffies; if (ring->stopped) { B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET); ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring)); ring->stopped = 0; if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) b43legacydbg(dev->wl, "Woke up TX ring %d\n", ring->index); } spin_unlock(&ring->lock); } void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev, struct ieee80211_tx_queue_stats *stats) { const int nr_queues = dev->wl->hw->queues; struct b43legacy_dmaring *ring; unsigned long flags; int i; for (i = 0; i < nr_queues; i++) { ring = priority_to_txring(dev, i); spin_lock_irqsave(&ring->lock, flags); stats[i].len = ring->used_slots / SLOTS_PER_PACKET; stats[i].limit = ring->nr_slots / SLOTS_PER_PACKET; stats[i].count = ring->nr_tx_packets; spin_unlock_irqrestore(&ring->lock, flags); } } static void dma_rx(struct b43legacy_dmaring *ring, int *slot) { const struct b43legacy_dma_ops *ops = ring->ops; struct b43legacy_dmadesc_generic *desc; struct b43legacy_dmadesc_meta *meta; struct b43legacy_rxhdr_fw3 *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; if (ring->index == 3) { /* We received an xmit status. */ struct b43legacy_hwtxstatus *hw = (struct b43legacy_hwtxstatus *)skb->data; int i = 0; while (hw->cookie == 0) { if (i > 100) break; i++; udelay(2); barrier(); } b43legacy_handle_hwtxstatus(ring->dev, hw); /* recycle the descriptor buffer. */ sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); return; } rxhdr = (struct b43legacy_rxhdr_fw3 *)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)) { /* recycle the descriptor buffer. */ sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); goto drop; } } if (unlikely(len > 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. */ sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); *slot = next_slot(ring, *slot); cnt++; tmp -= ring->rx_buffersize; if (tmp <= 0) break; } b43legacyerr(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)) { b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()" " failed\n"); sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize); goto drop; } unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); skb_put(skb, len + ring->frameoffset); skb_pull(skb, ring->frameoffset); b43legacy_rx(ring->dev, skb, rxhdr); drop: return; } void b43legacy_dma_rx(struct b43legacy_dmaring *ring) { const struct b43legacy_dma_ops *ops = ring->ops; int slot; int current_slot; int used_slots = 0; B43legacy_WARN_ON(ring->tx); current_slot = ops->get_current_rxslot(ring); B43legacy_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); } ops->set_current_rxslot(ring, slot); ring->current_slot = slot; } static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring) { unsigned long flags; spin_lock_irqsave(&ring->lock, flags); B43legacy_WARN_ON(!ring->tx); ring->ops->tx_suspend(ring); spin_unlock_irqrestore(&ring->lock, flags); } static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring) { unsigned long flags; spin_lock_irqsave(&ring->lock, flags); B43legacy_WARN_ON(!ring->tx); ring->ops->tx_resume(ring); spin_unlock_irqrestore(&ring->lock, flags); } void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev) { b43legacy_power_saving_ctl_bits(dev, -1, 1); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4); b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5); } void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev) { b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5); b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4); b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3); b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2); b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1); b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0); b43legacy_power_saving_ctl_bits(dev, -1, -1); }