| /* |
| |
| Broadcom B43legacy wireless driver |
| |
| DMA ringbuffer and descriptor allocation/management |
| |
| Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch> |
| |
| 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 <linux/dma-mapping.h> |
| #include <linux/pci.h> |
| #include <linux/delay.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <net/dst.h> |
| |
| /* 32bit DMA ops. */ |
| static |
| struct b43legacy_dmadesc32 *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 desc; |
| } |
| |
| static void op32_fill_descriptor(struct b43legacy_dmaring *ring, |
| struct b43legacy_dmadesc32 *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 - 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 |= ring->dev->dma.translation; |
| 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->control = cpu_to_le32(ctl); |
| desc->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 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 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, |
| }; |
| |
| 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) |
| { |
| /* GFP flags must match the flags in free_ringmemory()! */ |
| ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev, |
| B43legacy_DMA_RINGMEMSIZE, |
| &(ring->dmabase), GFP_KERNEL); |
| if (!ring->descbase) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void free_ringmemory(struct b43legacy_dmaring *ring) |
| { |
| dma_free_coherent(ring->dev->dev->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 = B43legacy_DMA32_RXCTL; |
| b43legacy_write32(dev, mmio_base + offset, 0); |
| for (i = 0; i < 10; i++) { |
| offset = B43legacy_DMA32_RXSTATUS; |
| value = b43legacy_read32(dev, mmio_base + offset); |
| 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 = B43legacy_DMA32_TXSTATUS; |
| value = b43legacy_read32(dev, mmio_base + offset); |
| value &= B43legacy_DMA32_TXSTATE; |
| if (value == B43legacy_DMA32_TXSTAT_DISABLED || |
| value == B43legacy_DMA32_TXSTAT_IDLEWAIT || |
| value == B43legacy_DMA32_TXSTAT_STOPPED) |
| break; |
| msleep(1); |
| } |
| offset = B43legacy_DMA32_TXCTL; |
| b43legacy_write32(dev, mmio_base + offset, 0); |
| for (i = 0; i < 10; i++) { |
| offset = B43legacy_DMA32_TXSTATUS; |
| value = b43legacy_read32(dev, mmio_base + offset); |
| 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(ring->dev->dev->dma_dev, addr))) |
| return true; |
| |
| 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; |
| } |
| |
| /* 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 int setup_rx_descbuffer(struct b43legacy_dmaring *ring, |
| struct b43legacy_dmadesc32 *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; |
| op32_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_dmadesc32 *desc; |
| struct b43legacy_dmadesc_meta *meta; |
| |
| for (i = 0; i < ring->nr_slots; i++) { |
| desc = op32_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 = op32_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 = ring->dev->dma.translation; |
| u32 ringbase = (u32)(ring->dmabase); |
| |
| if (ring->tx) { |
| 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; |
| |
| 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); |
| b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0); |
| } else { |
| b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base, |
| ring->type); |
| b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0); |
| } |
| } |
| |
| static void free_all_descbuffers(struct b43legacy_dmaring *ring) |
| { |
| struct b43legacy_dmadesc_meta *meta; |
| int i; |
| |
| if (!ring->used_slots) |
| return; |
| for (i = 0; i < ring->nr_slots; i++) { |
| op32_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; |
| |
| 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_BIT_MASK(32); |
| |
| return DMA_BIT_MASK(30); |
| } |
| |
| static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask) |
| { |
| if (dmamask == DMA_BIT_MASK(30)) |
| return B43legacy_DMA_30BIT; |
| if (dmamask == DMA_BIT_MASK(32)) |
| return B43legacy_DMA_32BIT; |
| B43legacy_WARN_ON(1); |
| return B43legacy_DMA_30BIT; |
| } |
| |
| /* 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; |
| ring->dev = dev; |
| |
| 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->nr_slots = nr_slots; |
| ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index); |
| ring->index = controller_index; |
| if (for_tx) { |
| ring->tx = true; |
| 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); |
| } |
| #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; |
| } |
| |
| static int b43legacy_dma_set_mask(struct b43legacy_wldev *dev, u64 mask) |
| { |
| u64 orig_mask = mask; |
| bool fallback = false; |
| int err; |
| |
| /* Try to set the DMA mask. If it fails, try falling back to a |
| * lower mask, as we can always also support a lower one. */ |
| while (1) { |
| err = dma_set_mask_and_coherent(dev->dev->dma_dev, mask); |
| if (!err) |
| break; |
| if (mask == DMA_BIT_MASK(64)) { |
| mask = DMA_BIT_MASK(32); |
| fallback = true; |
| continue; |
| } |
| if (mask == DMA_BIT_MASK(32)) { |
| mask = DMA_BIT_MASK(30); |
| fallback = true; |
| continue; |
| } |
| b43legacyerr(dev->wl, "The machine/kernel does not support " |
| "the required %u-bit DMA mask\n", |
| (unsigned int)dma_mask_to_engine_type(orig_mask)); |
| return -EOPNOTSUPP; |
| } |
| if (fallback) { |
| b43legacyinfo(dev->wl, "DMA mask fallback from %u-bit to %u-" |
| "bit\n", |
| (unsigned int)dma_mask_to_engine_type(orig_mask), |
| (unsigned int)dma_mask_to_engine_type(mask)); |
| } |
| |
| return 0; |
| } |
| |
| 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); |
| type = dma_mask_to_engine_type(dmamask); |
| err = b43legacy_dma_set_mask(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 = true; |
| return -EAGAIN; |
| #else |
| b43legacyerr(dev->wl, "DMA for this device not supported and " |
| "no PIO support compiled in\n"); |
| return -EOPNOTSUPP; |
| #endif |
| } |
| dma->translation = ssb_dma_translation(dev->dev); |
| |
| 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 **in_skb) |
| { |
| struct sk_buff *skb = *in_skb; |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| u8 *header; |
| int slot, old_top_slot, old_used_slots; |
| int err; |
| struct b43legacy_dmadesc32 *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 = op32_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; |
| } |
| op32_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 = op32_idx2desc(ring, slot, &meta); |
| memset(meta, 0, sizeof(*meta)); |
| |
| meta->skb = skb; |
| meta->is_last_fragment = true; |
| |
| 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 = alloc_skb(skb->len, GFP_KERNEL | GFP_DMA); |
| if (!bounce_skb) { |
| ring->current_slot = old_top_slot; |
| ring->used_slots = old_used_slots; |
| err = -ENOMEM; |
| goto out_unmap_hdr; |
| } |
| |
| skb_put_data(bounce_skb, skb->data, skb->len); |
| memcpy(bounce_skb->cb, skb->cb, sizeof(skb->cb)); |
| bounce_skb->dev = skb->dev; |
| skb_set_queue_mapping(bounce_skb, skb_get_queue_mapping(skb)); |
| info = IEEE80211_SKB_CB(bounce_skb); |
| |
| dev_kfree_skb_any(skb); |
| skb = bounce_skb; |
| *in_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; |
| } |
| } |
| |
| op32_fill_descriptor(ring, desc, meta->dmaaddr, |
| skb->len, 0, 1, 1); |
| |
| wmb(); /* previous stuff MUST be done */ |
| /* Now transfer the whole frame. */ |
| op32_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; |
| int err = 0; |
| |
| ring = priority_to_txring(dev, skb_get_queue_mapping(skb)); |
| B43legacy_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 (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) |
| b43legacyerr(dev->wl, "Packet after queue stopped\n"); |
| return -ENOSPC; |
| } |
| |
| if (WARN_ON(free_slots(ring) < SLOTS_PER_PACKET)) { |
| /* If we get here, we have a real error with the queue |
| * full, but queues not stopped. */ |
| b43legacyerr(dev->wl, "DMA queue overflow\n"); |
| return -ENOSPC; |
| } |
| |
| /* dma_tx_fragment might reallocate the skb, so invalidate pointers pointing |
| * into the skb data or cb now. */ |
| 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); |
| return 0; |
| } |
| if (unlikely(err)) { |
| b43legacyerr(dev->wl, "DMA tx mapping failure\n"); |
| return err; |
| } |
| if ((free_slots(ring) < SLOTS_PER_PACKET) || |
| should_inject_overflow(ring)) { |
| /* This TX ring is full. */ |
| unsigned int skb_mapping = skb_get_queue_mapping(skb); |
| ieee80211_stop_queue(dev->wl->hw, skb_mapping); |
| dev->wl->tx_queue_stopped[skb_mapping] = 1; |
| ring->stopped = true; |
| if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) |
| b43legacydbg(dev->wl, "Stopped TX ring %d\n", |
| ring->index); |
| } |
| return err; |
| } |
| |
| void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev, |
| const struct b43legacy_txstatus *status) |
| { |
| struct b43legacy_dmaring *ring; |
| struct b43legacy_dmadesc_meta *meta; |
| int retry_limit; |
| int slot; |
| int firstused; |
| |
| ring = parse_cookie(dev, status->cookie, &slot); |
| if (unlikely(!ring)) |
| return; |
| B43legacy_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; |
| if (unlikely(slot != firstused)) { |
| /* This possibly is a firmware bug and will result in |
| * malfunction, memory leaks and/or stall of DMA functionality. |
| */ |
| b43legacydbg(dev->wl, "Out of order TX status report on DMA " |
| "ring %d. Expected %d, but got %d\n", |
| ring->index, firstused, slot); |
| return; |
| } |
| |
| while (1) { |
| B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); |
| op32_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); |
| |
| /* preserve the confiured retry limit before clearing the status |
| * The xmit function has overwritten the rc's value with the actual |
| * retry limit done by the hardware */ |
| retry_limit = info->status.rates[0].count; |
| ieee80211_tx_info_clear_status(info); |
| |
| if (status->acked) |
| info->flags |= IEEE80211_TX_STAT_ACK; |
| |
| if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { |
| /* |
| * If the short retries (RTS, not data frame) have exceeded |
| * the limit, the hw will not have tried the selected rate, |
| * but will have used the fallback rate instead. |
| * Don't let the rate control count attempts for the selected |
| * rate in this case, otherwise the statistics will be off. |
| */ |
| info->status.rates[0].count = 0; |
| info->status.rates[1].count = status->frame_count; |
| } else { |
| if (status->frame_count > retry_limit) { |
| info->status.rates[0].count = retry_limit; |
| info->status.rates[1].count = status->frame_count - |
| retry_limit; |
| |
| } else { |
| info->status.rates[0].count = status->frame_count; |
| info->status.rates[1].idx = -1; |
| } |
| } |
| |
| /* Call back to inform the ieee80211 subsystem about the |
| * status of the transmission. |
| * Some fields of txstat are already filled in dma_tx(). |
| */ |
| 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); |
| ring->stopped = false; |
| } |
| |
| if (dev->wl->tx_queue_stopped[ring->queue_prio]) { |
| dev->wl->tx_queue_stopped[ring->queue_prio] = 0; |
| } else { |
| /* If the driver queue is running wake the corresponding |
| * mac80211 queue. */ |
| ieee80211_wake_queue(dev->wl->hw, ring->queue_prio); |
| if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) |
| b43legacydbg(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 b43legacy_dmaring *ring, |
| int *slot) |
| { |
| struct b43legacy_dmadesc32 *desc; |
| struct b43legacy_dmadesc_meta *meta; |
| struct b43legacy_rxhdr_fw3 *rxhdr; |
| struct sk_buff *skb; |
| u16 len; |
| int err; |
| dma_addr_t dmaaddr; |
| |
| desc = op32_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 = op32_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) |
| { |
| int slot; |
| int current_slot; |
| int used_slots = 0; |
| |
| B43legacy_WARN_ON(ring->tx); |
| current_slot = op32_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); |
| } |
| op32_set_current_rxslot(ring, slot); |
| ring->current_slot = slot; |
| } |
| |
| static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring) |
| { |
| B43legacy_WARN_ON(!ring->tx); |
| op32_tx_suspend(ring); |
| } |
| |
| static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring) |
| { |
| B43legacy_WARN_ON(!ring->tx); |
| op32_tx_resume(ring); |
| } |
| |
| 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); |
| } |