--- /dev/null
+/*
+
+ 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_zalloc_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_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);
+ 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 (unlikely(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);
+}
Code Review / kvmfornfv.git / blobdiff