--- /dev/null
+/*
+
+ Broadcom B43 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 "b43.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/etherdevice.h>
+#include <linux/slab.h>
+#include <asm/div64.h>
+
+
+/* Required number of TX DMA slots per TX frame.
+ * This currently is 2, because we put the header and the ieee80211 frame
+ * into separate slots. */
+#define TX_SLOTS_PER_FRAME 2
+
+static u32 b43_dma_address(struct b43_dma *dma, dma_addr_t dmaaddr,
+ enum b43_addrtype addrtype)
+{
+ u32 uninitialized_var(addr);
+
+ switch (addrtype) {
+ case B43_DMA_ADDR_LOW:
+ addr = lower_32_bits(dmaaddr);
+ if (dma->translation_in_low) {
+ addr &= ~SSB_DMA_TRANSLATION_MASK;
+ addr |= dma->translation;
+ }
+ break;
+ case B43_DMA_ADDR_HIGH:
+ addr = upper_32_bits(dmaaddr);
+ if (!dma->translation_in_low) {
+ addr &= ~SSB_DMA_TRANSLATION_MASK;
+ addr |= dma->translation;
+ }
+ break;
+ case B43_DMA_ADDR_EXT:
+ if (dma->translation_in_low)
+ addr = lower_32_bits(dmaaddr);
+ else
+ addr = upper_32_bits(dmaaddr);
+ addr &= SSB_DMA_TRANSLATION_MASK;
+ addr >>= SSB_DMA_TRANSLATION_SHIFT;
+ break;
+ }
+
+ return addr;
+}
+
+/* 32bit DMA ops. */
+static
+struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring,
+ int slot,
+ struct b43_dmadesc_meta **meta)
+{
+ struct b43_dmadesc32 *desc;
+
+ *meta = &(ring->meta[slot]);
+ desc = ring->descbase;
+ desc = &(desc[slot]);
+
+ return (struct b43_dmadesc_generic *)desc;
+}
+
+static void op32_fill_descriptor(struct b43_dmaring *ring,
+ struct b43_dmadesc_generic *desc,
+ dma_addr_t dmaaddr, u16 bufsize,
+ int start, int end, int irq)
+{
+ struct b43_dmadesc32 *descbase = ring->descbase;
+ int slot;
+ u32 ctl;
+ u32 addr;
+ u32 addrext;
+
+ slot = (int)(&(desc->dma32) - descbase);
+ B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
+
+ addr = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW);
+ addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT);
+
+ ctl = bufsize & B43_DMA32_DCTL_BYTECNT;
+ if (slot == ring->nr_slots - 1)
+ ctl |= B43_DMA32_DCTL_DTABLEEND;
+ if (start)
+ ctl |= B43_DMA32_DCTL_FRAMESTART;
+ if (end)
+ ctl |= B43_DMA32_DCTL_FRAMEEND;
+ if (irq)
+ ctl |= B43_DMA32_DCTL_IRQ;
+ ctl |= (addrext << B43_DMA32_DCTL_ADDREXT_SHIFT)
+ & B43_DMA32_DCTL_ADDREXT_MASK;
+
+ desc->dma32.control = cpu_to_le32(ctl);
+ desc->dma32.address = cpu_to_le32(addr);
+}
+
+static void op32_poke_tx(struct b43_dmaring *ring, int slot)
+{
+ b43_dma_write(ring, B43_DMA32_TXINDEX,
+ (u32) (slot * sizeof(struct b43_dmadesc32)));
+}
+
+static void op32_tx_suspend(struct b43_dmaring *ring)
+{
+ b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL)
+ | B43_DMA32_TXSUSPEND);
+}
+
+static void op32_tx_resume(struct b43_dmaring *ring)
+{
+ b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL)
+ & ~B43_DMA32_TXSUSPEND);
+}
+
+static int op32_get_current_rxslot(struct b43_dmaring *ring)
+{
+ u32 val;
+
+ val = b43_dma_read(ring, B43_DMA32_RXSTATUS);
+ val &= B43_DMA32_RXDPTR;
+
+ return (val / sizeof(struct b43_dmadesc32));
+}
+
+static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot)
+{
+ b43_dma_write(ring, B43_DMA32_RXINDEX,
+ (u32) (slot * sizeof(struct b43_dmadesc32)));
+}
+
+static const struct b43_dma_ops dma32_ops = {
+ .idx2desc = op32_idx2desc,
+ .fill_descriptor = op32_fill_descriptor,
+ .poke_tx = op32_poke_tx,
+ .tx_suspend = op32_tx_suspend,
+ .tx_resume = op32_tx_resume,
+ .get_current_rxslot = op32_get_current_rxslot,
+ .set_current_rxslot = op32_set_current_rxslot,
+};
+
+/* 64bit DMA ops. */
+static
+struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring,
+ int slot,
+ struct b43_dmadesc_meta **meta)
+{
+ struct b43_dmadesc64 *desc;
+
+ *meta = &(ring->meta[slot]);
+ desc = ring->descbase;
+ desc = &(desc[slot]);
+
+ return (struct b43_dmadesc_generic *)desc;
+}
+
+static void op64_fill_descriptor(struct b43_dmaring *ring,
+ struct b43_dmadesc_generic *desc,
+ dma_addr_t dmaaddr, u16 bufsize,
+ int start, int end, int irq)
+{
+ struct b43_dmadesc64 *descbase = ring->descbase;
+ int slot;
+ u32 ctl0 = 0, ctl1 = 0;
+ u32 addrlo, addrhi;
+ u32 addrext;
+
+ slot = (int)(&(desc->dma64) - descbase);
+ B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
+
+ addrlo = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW);
+ addrhi = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_HIGH);
+ addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT);
+
+ if (slot == ring->nr_slots - 1)
+ ctl0 |= B43_DMA64_DCTL0_DTABLEEND;
+ if (start)
+ ctl0 |= B43_DMA64_DCTL0_FRAMESTART;
+ if (end)
+ ctl0 |= B43_DMA64_DCTL0_FRAMEEND;
+ if (irq)
+ ctl0 |= B43_DMA64_DCTL0_IRQ;
+ ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT;
+ ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT)
+ & B43_DMA64_DCTL1_ADDREXT_MASK;
+
+ desc->dma64.control0 = cpu_to_le32(ctl0);
+ desc->dma64.control1 = cpu_to_le32(ctl1);
+ desc->dma64.address_low = cpu_to_le32(addrlo);
+ desc->dma64.address_high = cpu_to_le32(addrhi);
+}
+
+static void op64_poke_tx(struct b43_dmaring *ring, int slot)
+{
+ b43_dma_write(ring, B43_DMA64_TXINDEX,
+ (u32) (slot * sizeof(struct b43_dmadesc64)));
+}
+
+static void op64_tx_suspend(struct b43_dmaring *ring)
+{
+ b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL)
+ | B43_DMA64_TXSUSPEND);
+}
+
+static void op64_tx_resume(struct b43_dmaring *ring)
+{
+ b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL)
+ & ~B43_DMA64_TXSUSPEND);
+}
+
+static int op64_get_current_rxslot(struct b43_dmaring *ring)
+{
+ u32 val;
+
+ val = b43_dma_read(ring, B43_DMA64_RXSTATUS);
+ val &= B43_DMA64_RXSTATDPTR;
+
+ return (val / sizeof(struct b43_dmadesc64));
+}
+
+static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot)
+{
+ b43_dma_write(ring, B43_DMA64_RXINDEX,
+ (u32) (slot * sizeof(struct b43_dmadesc64)));
+}
+
+static const struct b43_dma_ops dma64_ops = {
+ .idx2desc = op64_idx2desc,
+ .fill_descriptor = op64_fill_descriptor,
+ .poke_tx = op64_poke_tx,
+ .tx_suspend = op64_tx_suspend,
+ .tx_resume = op64_tx_resume,
+ .get_current_rxslot = op64_get_current_rxslot,
+ .set_current_rxslot = op64_set_current_rxslot,
+};
+
+static inline int free_slots(struct b43_dmaring *ring)
+{
+ return (ring->nr_slots - ring->used_slots);
+}
+
+static inline int next_slot(struct b43_dmaring *ring, int slot)
+{
+ B43_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1));
+ if (slot == ring->nr_slots - 1)
+ return 0;
+ return slot + 1;
+}
+
+static inline int prev_slot(struct b43_dmaring *ring, int slot)
+{
+ B43_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1));
+ if (slot == 0)
+ return ring->nr_slots - 1;
+ return slot - 1;
+}
+
+#ifdef CONFIG_B43_DEBUG
+static void update_max_used_slots(struct b43_dmaring *ring,
+ int current_used_slots)
+{
+ if (current_used_slots <= ring->max_used_slots)
+ return;
+ ring->max_used_slots = current_used_slots;
+ if (b43_debug(ring->dev, B43_DBG_DMAVERBOSE)) {
+ b43dbg(ring->dev->wl,
+ "max_used_slots increased to %d on %s ring %d\n",
+ ring->max_used_slots,
+ ring->tx ? "TX" : "RX", ring->index);
+ }
+}
+#else
+static inline
+ void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots)
+{
+}
+#endif /* DEBUG */
+
+/* Request a slot for usage. */
+static inline int request_slot(struct b43_dmaring *ring)
+{
+ int slot;
+
+ B43_WARN_ON(!ring->tx);
+ B43_WARN_ON(ring->stopped);
+ B43_WARN_ON(free_slots(ring) == 0);
+
+ slot = next_slot(ring, ring->current_slot);
+ ring->current_slot = slot;
+ ring->used_slots++;
+
+ update_max_used_slots(ring, ring->used_slots);
+
+ return slot;
+}
+
+static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx)
+{
+ static const u16 map64[] = {
+ B43_MMIO_DMA64_BASE0,
+ B43_MMIO_DMA64_BASE1,
+ B43_MMIO_DMA64_BASE2,
+ B43_MMIO_DMA64_BASE3,
+ B43_MMIO_DMA64_BASE4,
+ B43_MMIO_DMA64_BASE5,
+ };
+ static const u16 map32[] = {
+ B43_MMIO_DMA32_BASE0,
+ B43_MMIO_DMA32_BASE1,
+ B43_MMIO_DMA32_BASE2,
+ B43_MMIO_DMA32_BASE3,
+ B43_MMIO_DMA32_BASE4,
+ B43_MMIO_DMA32_BASE5,
+ };
+
+ if (type == B43_DMA_64BIT) {
+ B43_WARN_ON(!(controller_idx >= 0 &&
+ controller_idx < ARRAY_SIZE(map64)));
+ return map64[controller_idx];
+ }
+ B43_WARN_ON(!(controller_idx >= 0 &&
+ controller_idx < ARRAY_SIZE(map32)));
+ return map32[controller_idx];
+}
+
+static inline
+ dma_addr_t map_descbuffer(struct b43_dmaring *ring,
+ unsigned char *buf, size_t len, int tx)
+{
+ dma_addr_t dmaaddr;
+
+ if (tx) {
+ dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
+ buf, len, DMA_TO_DEVICE);
+ } else {
+ dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
+ buf, len, DMA_FROM_DEVICE);
+ }
+
+ return dmaaddr;
+}
+
+static inline
+ void unmap_descbuffer(struct b43_dmaring *ring,
+ dma_addr_t addr, size_t len, int tx)
+{
+ if (tx) {
+ dma_unmap_single(ring->dev->dev->dma_dev,
+ addr, len, DMA_TO_DEVICE);
+ } else {
+ dma_unmap_single(ring->dev->dev->dma_dev,
+ addr, len, DMA_FROM_DEVICE);
+ }
+}
+
+static inline
+ void sync_descbuffer_for_cpu(struct b43_dmaring *ring,
+ dma_addr_t addr, size_t len)
+{
+ B43_WARN_ON(ring->tx);
+ dma_sync_single_for_cpu(ring->dev->dev->dma_dev,
+ addr, len, DMA_FROM_DEVICE);
+}
+
+static inline
+ void sync_descbuffer_for_device(struct b43_dmaring *ring,
+ dma_addr_t addr, size_t len)
+{
+ B43_WARN_ON(ring->tx);
+ dma_sync_single_for_device(ring->dev->dev->dma_dev,
+ addr, len, DMA_FROM_DEVICE);
+}
+
+static inline
+ void free_descriptor_buffer(struct b43_dmaring *ring,
+ struct b43_dmadesc_meta *meta)
+{
+ if (meta->skb) {
+ if (ring->tx)
+ ieee80211_free_txskb(ring->dev->wl->hw, meta->skb);
+ else
+ dev_kfree_skb_any(meta->skb);
+ meta->skb = NULL;
+ }
+}
+
+static int alloc_ringmemory(struct b43_dmaring *ring)
+{
+ /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K
+ * alignment and 8K buffers for 64-bit DMA with 8K alignment.
+ * In practice we could use smaller buffers for the latter, but the
+ * alignment is really important because of the hardware bug. If bit
+ * 0x00001000 is used in DMA address, some hardware (like BCM4331)
+ * copies that bit into B43_DMA64_RXSTATUS and we get false values from
+ * B43_DMA64_RXSTATDPTR. Let's just use 8K buffers even if we don't use
+ * more than 256 slots for ring.
+ */
+ u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ?
+ B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE;
+
+ ring->descbase = dma_zalloc_coherent(ring->dev->dev->dma_dev,
+ ring_mem_size, &(ring->dmabase),
+ GFP_KERNEL);
+ if (!ring->descbase)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void free_ringmemory(struct b43_dmaring *ring)
+{
+ u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ?
+ B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE;
+ dma_free_coherent(ring->dev->dev->dma_dev, ring_mem_size,
+ ring->descbase, ring->dmabase);
+}
+
+/* Reset the RX DMA channel */
+static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base,
+ enum b43_dmatype type)
+{
+ int i;
+ u32 value;
+ u16 offset;
+
+ might_sleep();
+
+ offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXCTL : B43_DMA32_RXCTL;
+ b43_write32(dev, mmio_base + offset, 0);
+ for (i = 0; i < 10; i++) {
+ offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXSTATUS :
+ B43_DMA32_RXSTATUS;
+ value = b43_read32(dev, mmio_base + offset);
+ if (type == B43_DMA_64BIT) {
+ value &= B43_DMA64_RXSTAT;
+ if (value == B43_DMA64_RXSTAT_DISABLED) {
+ i = -1;
+ break;
+ }
+ } else {
+ value &= B43_DMA32_RXSTATE;
+ if (value == B43_DMA32_RXSTAT_DISABLED) {
+ i = -1;
+ break;
+ }
+ }
+ msleep(1);
+ }
+ if (i != -1) {
+ b43err(dev->wl, "DMA RX reset timed out\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/* Reset the TX DMA channel */
+static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base,
+ enum b43_dmatype type)
+{
+ int i;
+ u32 value;
+ u16 offset;
+
+ might_sleep();
+
+ for (i = 0; i < 10; i++) {
+ offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS :
+ B43_DMA32_TXSTATUS;
+ value = b43_read32(dev, mmio_base + offset);
+ if (type == B43_DMA_64BIT) {
+ value &= B43_DMA64_TXSTAT;
+ if (value == B43_DMA64_TXSTAT_DISABLED ||
+ value == B43_DMA64_TXSTAT_IDLEWAIT ||
+ value == B43_DMA64_TXSTAT_STOPPED)
+ break;
+ } else {
+ value &= B43_DMA32_TXSTATE;
+ if (value == B43_DMA32_TXSTAT_DISABLED ||
+ value == B43_DMA32_TXSTAT_IDLEWAIT ||
+ value == B43_DMA32_TXSTAT_STOPPED)
+ break;
+ }
+ msleep(1);
+ }
+ offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXCTL : B43_DMA32_TXCTL;
+ b43_write32(dev, mmio_base + offset, 0);
+ for (i = 0; i < 10; i++) {
+ offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS :
+ B43_DMA32_TXSTATUS;
+ value = b43_read32(dev, mmio_base + offset);
+ if (type == B43_DMA_64BIT) {
+ value &= B43_DMA64_TXSTAT;
+ if (value == B43_DMA64_TXSTAT_DISABLED) {
+ i = -1;
+ break;
+ }
+ } else {
+ value &= B43_DMA32_TXSTATE;
+ if (value == B43_DMA32_TXSTAT_DISABLED) {
+ i = -1;
+ break;
+ }
+ }
+ msleep(1);
+ }
+ if (i != -1) {
+ b43err(dev->wl, "DMA TX reset timed out\n");
+ return -ENODEV;
+ }
+ /* ensure the reset is completed. */
+ msleep(1);
+
+ return 0;
+}
+
+/* Check if a DMA mapping address is invalid. */
+static bool b43_dma_mapping_error(struct b43_dmaring *ring,
+ dma_addr_t addr,
+ size_t buffersize, bool dma_to_device)
+{
+ if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr)))
+ return true;
+
+ switch (ring->type) {
+ case B43_DMA_30BIT:
+ if ((u64)addr + buffersize > (1ULL << 30))
+ goto address_error;
+ break;
+ case B43_DMA_32BIT:
+ if ((u64)addr + buffersize > (1ULL << 32))
+ goto address_error;
+ break;
+ case B43_DMA_64BIT:
+ /* Currently we can't have addresses beyond
+ * 64bit in the kernel. */
+ break;
+ }
+
+ /* The address is OK. */
+ return false;
+
+address_error:
+ /* We can't support this address. Unmap it again. */
+ unmap_descbuffer(ring, addr, buffersize, dma_to_device);
+
+ return true;
+}
+
+static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb)
+{
+ unsigned char *f = skb->data + ring->frameoffset;
+
+ return ((f[0] & f[1] & f[2] & f[3] & f[4] & f[5] & f[6] & f[7]) == 0xFF);
+}
+
+static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb)
+{
+ struct b43_rxhdr_fw4 *rxhdr;
+ unsigned char *frame;
+
+ /* This poisons the RX buffer to detect DMA failures. */
+
+ rxhdr = (struct b43_rxhdr_fw4 *)(skb->data);
+ rxhdr->frame_len = 0;
+
+ B43_WARN_ON(ring->rx_buffersize < ring->frameoffset + sizeof(struct b43_plcp_hdr6) + 2);
+ frame = skb->data + ring->frameoffset;
+ memset(frame, 0xFF, sizeof(struct b43_plcp_hdr6) + 2 /* padding */);
+}
+
+static int setup_rx_descbuffer(struct b43_dmaring *ring,
+ struct b43_dmadesc_generic *desc,
+ struct b43_dmadesc_meta *meta, gfp_t gfp_flags)
+{
+ dma_addr_t dmaaddr;
+ struct sk_buff *skb;
+
+ B43_WARN_ON(ring->tx);
+
+ skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
+ if (unlikely(!skb))
+ return -ENOMEM;
+ b43_poison_rx_buffer(ring, skb);
+ dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0);
+ if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
+ /* ugh. try to realloc in zone_dma */
+ gfp_flags |= GFP_DMA;
+
+ dev_kfree_skb_any(skb);
+
+ skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
+ if (unlikely(!skb))
+ return -ENOMEM;
+ b43_poison_rx_buffer(ring, skb);
+ dmaaddr = map_descbuffer(ring, skb->data,
+ ring->rx_buffersize, 0);
+ if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
+ b43err(ring->dev->wl, "RX DMA buffer allocation failed\n");
+ dev_kfree_skb_any(skb);
+ return -EIO;
+ }
+ }
+
+ meta->skb = skb;
+ meta->dmaaddr = dmaaddr;
+ ring->ops->fill_descriptor(ring, desc, dmaaddr,
+ ring->rx_buffersize, 0, 0, 0);
+
+ return 0;
+}
+
+/* Allocate the initial descbuffers.
+ * This is used for an RX ring only.
+ */
+static int alloc_initial_descbuffers(struct b43_dmaring *ring)
+{
+ int i, err = -ENOMEM;
+ struct b43_dmadesc_generic *desc;
+ struct b43_dmadesc_meta *meta;
+
+ for (i = 0; i < ring->nr_slots; i++) {
+ desc = ring->ops->idx2desc(ring, i, &meta);
+
+ err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL);
+ if (err) {
+ b43err(ring->dev->wl,
+ "Failed to allocate initial descbuffers\n");
+ goto err_unwind;
+ }
+ }
+ mb();
+ ring->used_slots = ring->nr_slots;
+ err = 0;
+ out:
+ return err;
+
+ err_unwind:
+ for (i--; i >= 0; i--) {
+ desc = ring->ops->idx2desc(ring, i, &meta);
+
+ unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0);
+ dev_kfree_skb(meta->skb);
+ }
+ goto out;
+}
+
+/* Do initial setup of the DMA controller.
+ * Reset the controller, write the ring busaddress
+ * and switch the "enable" bit on.
+ */
+static int dmacontroller_setup(struct b43_dmaring *ring)
+{
+ int err = 0;
+ u32 value;
+ u32 addrext;
+ bool parity = ring->dev->dma.parity;
+ u32 addrlo;
+ u32 addrhi;
+
+ if (ring->tx) {
+ if (ring->type == B43_DMA_64BIT) {
+ u64 ringbase = (u64) (ring->dmabase);
+ addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT);
+ addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW);
+ addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH);
+
+ value = B43_DMA64_TXENABLE;
+ value |= (addrext << B43_DMA64_TXADDREXT_SHIFT)
+ & B43_DMA64_TXADDREXT_MASK;
+ if (!parity)
+ value |= B43_DMA64_TXPARITYDISABLE;
+ b43_dma_write(ring, B43_DMA64_TXCTL, value);
+ b43_dma_write(ring, B43_DMA64_TXRINGLO, addrlo);
+ b43_dma_write(ring, B43_DMA64_TXRINGHI, addrhi);
+ } else {
+ u32 ringbase = (u32) (ring->dmabase);
+ addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT);
+ addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW);
+
+ value = B43_DMA32_TXENABLE;
+ value |= (addrext << B43_DMA32_TXADDREXT_SHIFT)
+ & B43_DMA32_TXADDREXT_MASK;
+ if (!parity)
+ value |= B43_DMA32_TXPARITYDISABLE;
+ b43_dma_write(ring, B43_DMA32_TXCTL, value);
+ b43_dma_write(ring, B43_DMA32_TXRING, addrlo);
+ }
+ } else {
+ err = alloc_initial_descbuffers(ring);
+ if (err)
+ goto out;
+ if (ring->type == B43_DMA_64BIT) {
+ u64 ringbase = (u64) (ring->dmabase);
+ addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT);
+ addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW);
+ addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH);
+
+ value = (ring->frameoffset << B43_DMA64_RXFROFF_SHIFT);
+ value |= B43_DMA64_RXENABLE;
+ value |= (addrext << B43_DMA64_RXADDREXT_SHIFT)
+ & B43_DMA64_RXADDREXT_MASK;
+ if (!parity)
+ value |= B43_DMA64_RXPARITYDISABLE;
+ b43_dma_write(ring, B43_DMA64_RXCTL, value);
+ b43_dma_write(ring, B43_DMA64_RXRINGLO, addrlo);
+ b43_dma_write(ring, B43_DMA64_RXRINGHI, addrhi);
+ b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots *
+ sizeof(struct b43_dmadesc64));
+ } else {
+ u32 ringbase = (u32) (ring->dmabase);
+ addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT);
+ addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW);
+
+ value = (ring->frameoffset << B43_DMA32_RXFROFF_SHIFT);
+ value |= B43_DMA32_RXENABLE;
+ value |= (addrext << B43_DMA32_RXADDREXT_SHIFT)
+ & B43_DMA32_RXADDREXT_MASK;
+ if (!parity)
+ value |= B43_DMA32_RXPARITYDISABLE;
+ b43_dma_write(ring, B43_DMA32_RXCTL, value);
+ b43_dma_write(ring, B43_DMA32_RXRING, addrlo);
+ b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots *
+ sizeof(struct b43_dmadesc32));
+ }
+ }
+
+out:
+ return err;
+}
+
+/* Shutdown the DMA controller. */
+static void dmacontroller_cleanup(struct b43_dmaring *ring)
+{
+ if (ring->tx) {
+ b43_dmacontroller_tx_reset(ring->dev, ring->mmio_base,
+ ring->type);
+ if (ring->type == B43_DMA_64BIT) {
+ b43_dma_write(ring, B43_DMA64_TXRINGLO, 0);
+ b43_dma_write(ring, B43_DMA64_TXRINGHI, 0);
+ } else
+ b43_dma_write(ring, B43_DMA32_TXRING, 0);
+ } else {
+ b43_dmacontroller_rx_reset(ring->dev, ring->mmio_base,
+ ring->type);
+ if (ring->type == B43_DMA_64BIT) {
+ b43_dma_write(ring, B43_DMA64_RXRINGLO, 0);
+ b43_dma_write(ring, B43_DMA64_RXRINGHI, 0);
+ } else
+ b43_dma_write(ring, B43_DMA32_RXRING, 0);
+ }
+}
+
+static void free_all_descbuffers(struct b43_dmaring *ring)
+{
+ struct b43_dmadesc_meta *meta;
+ int i;
+
+ if (!ring->used_slots)
+ return;
+ for (i = 0; i < ring->nr_slots; i++) {
+ /* get meta - ignore returned value */
+ ring->ops->idx2desc(ring, i, &meta);
+
+ if (!meta->skb || b43_dma_ptr_is_poisoned(meta->skb)) {
+ B43_WARN_ON(!ring->tx);
+ continue;
+ }
+ if (ring->tx) {
+ unmap_descbuffer(ring, meta->dmaaddr,
+ meta->skb->len, 1);
+ } else {
+ unmap_descbuffer(ring, meta->dmaaddr,
+ ring->rx_buffersize, 0);
+ }
+ free_descriptor_buffer(ring, meta);
+ }
+}
+
+static u64 supported_dma_mask(struct b43_wldev *dev)
+{
+ u32 tmp;
+ u16 mmio_base;
+
+ switch (dev->dev->bus_type) {
+#ifdef CONFIG_B43_BCMA
+ case B43_BUS_BCMA:
+ tmp = bcma_aread32(dev->dev->bdev, BCMA_IOST);
+ if (tmp & BCMA_IOST_DMA64)
+ return DMA_BIT_MASK(64);
+ break;
+#endif
+#ifdef CONFIG_B43_SSB
+ case B43_BUS_SSB:
+ tmp = ssb_read32(dev->dev->sdev, SSB_TMSHIGH);
+ if (tmp & SSB_TMSHIGH_DMA64)
+ return DMA_BIT_MASK(64);
+ break;
+#endif
+ }
+
+ mmio_base = b43_dmacontroller_base(0, 0);
+ b43_write32(dev, mmio_base + B43_DMA32_TXCTL, B43_DMA32_TXADDREXT_MASK);
+ tmp = b43_read32(dev, mmio_base + B43_DMA32_TXCTL);
+ if (tmp & B43_DMA32_TXADDREXT_MASK)
+ return DMA_BIT_MASK(32);
+
+ return DMA_BIT_MASK(30);
+}
+
+static enum b43_dmatype dma_mask_to_engine_type(u64 dmamask)
+{
+ if (dmamask == DMA_BIT_MASK(30))
+ return B43_DMA_30BIT;
+ if (dmamask == DMA_BIT_MASK(32))
+ return B43_DMA_32BIT;
+ if (dmamask == DMA_BIT_MASK(64))
+ return B43_DMA_64BIT;
+ B43_WARN_ON(1);
+ return B43_DMA_30BIT;
+}
+
+/* Main initialization function. */
+static
+struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
+ int controller_index,
+ int for_tx,
+ enum b43_dmatype type)
+{
+ struct b43_dmaring *ring;
+ int i, err;
+ dma_addr_t dma_test;
+
+ ring = kzalloc(sizeof(*ring), GFP_KERNEL);
+ if (!ring)
+ goto out;
+
+ ring->nr_slots = B43_RXRING_SLOTS;
+ if (for_tx)
+ ring->nr_slots = B43_TXRING_SLOTS;
+
+ ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta),
+ GFP_KERNEL);
+ if (!ring->meta)
+ goto err_kfree_ring;
+ for (i = 0; i < ring->nr_slots; i++)
+ ring->meta->skb = B43_DMA_PTR_POISON;
+
+ ring->type = type;
+ ring->dev = dev;
+ ring->mmio_base = b43_dmacontroller_base(type, controller_index);
+ ring->index = controller_index;
+ if (type == B43_DMA_64BIT)
+ ring->ops = &dma64_ops;
+ else
+ ring->ops = &dma32_ops;
+ if (for_tx) {
+ ring->tx = true;
+ ring->current_slot = -1;
+ } else {
+ if (ring->index == 0) {
+ switch (dev->fw.hdr_format) {
+ case B43_FW_HDR_598:
+ ring->rx_buffersize = B43_DMA0_RX_FW598_BUFSIZE;
+ ring->frameoffset = B43_DMA0_RX_FW598_FO;
+ break;
+ case B43_FW_HDR_410:
+ case B43_FW_HDR_351:
+ ring->rx_buffersize = B43_DMA0_RX_FW351_BUFSIZE;
+ ring->frameoffset = B43_DMA0_RX_FW351_FO;
+ break;
+ }
+ } else
+ B43_WARN_ON(1);
+ }
+#ifdef CONFIG_B43_DEBUG
+ ring->last_injected_overflow = jiffies;
+#endif
+
+ if (for_tx) {
+ /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */
+ BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0);
+
+ ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
+ b43_txhdr_size(dev),
+ GFP_KERNEL);
+ if (!ring->txhdr_cache)
+ goto err_kfree_meta;
+
+ /* test for ability to dma to txhdr_cache */
+ dma_test = dma_map_single(dev->dev->dma_dev,
+ ring->txhdr_cache,
+ b43_txhdr_size(dev),
+ DMA_TO_DEVICE);
+
+ if (b43_dma_mapping_error(ring, dma_test,
+ b43_txhdr_size(dev), 1)) {
+ /* ugh realloc */
+ kfree(ring->txhdr_cache);
+ ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
+ b43_txhdr_size(dev),
+ GFP_KERNEL | GFP_DMA);
+ if (!ring->txhdr_cache)
+ goto err_kfree_meta;
+
+ dma_test = dma_map_single(dev->dev->dma_dev,
+ ring->txhdr_cache,
+ b43_txhdr_size(dev),
+ DMA_TO_DEVICE);
+
+ if (b43_dma_mapping_error(ring, dma_test,
+ b43_txhdr_size(dev), 1)) {
+
+ b43err(dev->wl,
+ "TXHDR DMA allocation failed\n");
+ goto err_kfree_txhdr_cache;
+ }
+ }
+
+ dma_unmap_single(dev->dev->dma_dev,
+ dma_test, b43_txhdr_size(dev),
+ DMA_TO_DEVICE);
+ }
+
+ err = alloc_ringmemory(ring);
+ if (err)
+ goto err_kfree_txhdr_cache;
+ err = dmacontroller_setup(ring);
+ if (err)
+ goto err_free_ringmemory;
+
+ out:
+ return ring;
+
+ err_free_ringmemory:
+ free_ringmemory(ring);
+ err_kfree_txhdr_cache:
+ kfree(ring->txhdr_cache);
+ err_kfree_meta:
+ kfree(ring->meta);
+ err_kfree_ring:
+ kfree(ring);
+ ring = NULL;
+ goto out;
+}
+
+#define divide(a, b) ({ \
+ typeof(a) __a = a; \
+ do_div(__a, b); \
+ __a; \
+ })
+
+#define modulo(a, b) ({ \
+ typeof(a) __a = a; \
+ do_div(__a, b); \
+ })
+
+/* Main cleanup function. */
+static void b43_destroy_dmaring(struct b43_dmaring *ring,
+ const char *ringname)
+{
+ if (!ring)
+ return;
+
+#ifdef CONFIG_B43_DEBUG
+ {
+ /* Print some statistics. */
+ u64 failed_packets = ring->nr_failed_tx_packets;
+ u64 succeed_packets = ring->nr_succeed_tx_packets;
+ u64 nr_packets = failed_packets + succeed_packets;
+ u64 permille_failed = 0, average_tries = 0;
+
+ if (nr_packets)
+ permille_failed = divide(failed_packets * 1000, nr_packets);
+ if (nr_packets)
+ average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets);
+
+ b43dbg(ring->dev->wl, "DMA-%u %s: "
+ "Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, "
+ "Average tries %llu.%02llu\n",
+ (unsigned int)(ring->type), ringname,
+ ring->max_used_slots,
+ ring->nr_slots,
+ (unsigned long long)failed_packets,
+ (unsigned long long)nr_packets,
+ (unsigned long long)divide(permille_failed, 10),
+ (unsigned long long)modulo(permille_failed, 10),
+ (unsigned long long)divide(average_tries, 100),
+ (unsigned long long)modulo(average_tries, 100));
+ }
+#endif /* DEBUG */
+
+ /* Device IRQs are disabled prior entering this function,
+ * so no need to take care of concurrency with rx handler stuff.
+ */
+ dmacontroller_cleanup(ring);
+ free_all_descbuffers(ring);
+ free_ringmemory(ring);
+
+ kfree(ring->txhdr_cache);
+ kfree(ring->meta);
+ kfree(ring);
+}
+
+#define destroy_ring(dma, ring) do { \
+ b43_destroy_dmaring((dma)->ring, __stringify(ring)); \
+ (dma)->ring = NULL; \
+ } while (0)
+
+void b43_dma_free(struct b43_wldev *dev)
+{
+ struct b43_dma *dma;
+
+ if (b43_using_pio_transfers(dev))
+ return;
+ dma = &dev->dma;
+
+ destroy_ring(dma, rx_ring);
+ destroy_ring(dma, tx_ring_AC_BK);
+ destroy_ring(dma, tx_ring_AC_BE);
+ destroy_ring(dma, tx_ring_AC_VI);
+ destroy_ring(dma, tx_ring_AC_VO);
+ destroy_ring(dma, tx_ring_mcast);
+}
+
+static int b43_dma_set_mask(struct b43_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;
+ }
+ b43err(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) {
+ b43info(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;
+}
+
+/* Some hardware with 64-bit DMA seems to be bugged and looks for translation
+ * bit in low address word instead of high one.
+ */
+static bool b43_dma_translation_in_low_word(struct b43_wldev *dev,
+ enum b43_dmatype type)
+{
+ if (type != B43_DMA_64BIT)
+ return true;
+
+#ifdef CONFIG_B43_SSB
+ if (dev->dev->bus_type == B43_BUS_SSB &&
+ dev->dev->sdev->bus->bustype == SSB_BUSTYPE_PCI &&
+ !(pci_is_pcie(dev->dev->sdev->bus->host_pci) &&
+ ssb_read32(dev->dev->sdev, SSB_TMSHIGH) & SSB_TMSHIGH_DMA64))
+ return true;
+#endif
+ return false;
+}
+
+int b43_dma_init(struct b43_wldev *dev)
+{
+ struct b43_dma *dma = &dev->dma;
+ int err;
+ u64 dmamask;
+ enum b43_dmatype type;
+
+ dmamask = supported_dma_mask(dev);
+ type = dma_mask_to_engine_type(dmamask);
+ err = b43_dma_set_mask(dev, dmamask);
+ if (err)
+ return err;
+
+ switch (dev->dev->bus_type) {
+#ifdef CONFIG_B43_BCMA
+ case B43_BUS_BCMA:
+ dma->translation = bcma_core_dma_translation(dev->dev->bdev);
+ break;
+#endif
+#ifdef CONFIG_B43_SSB
+ case B43_BUS_SSB:
+ dma->translation = ssb_dma_translation(dev->dev->sdev);
+ break;
+#endif
+ }
+ dma->translation_in_low = b43_dma_translation_in_low_word(dev, type);
+
+ dma->parity = true;
+#ifdef CONFIG_B43_BCMA
+ /* TODO: find out which SSB devices need disabling parity */
+ if (dev->dev->bus_type == B43_BUS_BCMA)
+ dma->parity = false;
+#endif
+
+ err = -ENOMEM;
+ /* setup TX DMA channels. */
+ dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type);
+ if (!dma->tx_ring_AC_BK)
+ goto out;
+
+ dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type);
+ if (!dma->tx_ring_AC_BE)
+ goto err_destroy_bk;
+
+ dma->tx_ring_AC_VI = b43_setup_dmaring(dev, 2, 1, type);
+ if (!dma->tx_ring_AC_VI)
+ goto err_destroy_be;
+
+ dma->tx_ring_AC_VO = b43_setup_dmaring(dev, 3, 1, type);
+ if (!dma->tx_ring_AC_VO)
+ goto err_destroy_vi;
+
+ dma->tx_ring_mcast = b43_setup_dmaring(dev, 4, 1, type);
+ if (!dma->tx_ring_mcast)
+ goto err_destroy_vo;
+
+ /* setup RX DMA channel. */
+ dma->rx_ring = b43_setup_dmaring(dev, 0, 0, type);
+ if (!dma->rx_ring)
+ goto err_destroy_mcast;
+
+ /* No support for the TX status DMA ring. */
+ B43_WARN_ON(dev->dev->core_rev < 5);
+
+ b43dbg(dev->wl, "%u-bit DMA initialized\n",
+ (unsigned int)type);
+ err = 0;
+out:
+ return err;
+
+err_destroy_mcast:
+ destroy_ring(dma, tx_ring_mcast);
+err_destroy_vo:
+ destroy_ring(dma, tx_ring_AC_VO);
+err_destroy_vi:
+ destroy_ring(dma, tx_ring_AC_VI);
+err_destroy_be:
+ destroy_ring(dma, tx_ring_AC_BE);
+err_destroy_bk:
+ destroy_ring(dma, tx_ring_AC_BK);
+ return err;
+}
+
+/* Generate a cookie for the TX header. */
+static u16 generate_cookie(struct b43_dmaring *ring, int slot)
+{
+ u16 cookie;
+
+ /* Use the upper 4 bits of the cookie as
+ * DMA controller ID and store the slot number
+ * in the lower 12 bits.
+ * Note that the cookie must never be 0, as this
+ * is a special value used in RX path.
+ * It can also not be 0xFFFF because that is special
+ * for multicast frames.
+ */
+ cookie = (((u16)ring->index + 1) << 12);
+ B43_WARN_ON(slot & ~0x0FFF);
+ cookie |= (u16)slot;
+
+ return cookie;
+}
+
+/* Inspect a cookie and find out to which controller/slot it belongs. */
+static
+struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot)
+{
+ struct b43_dma *dma = &dev->dma;
+ struct b43_dmaring *ring = NULL;
+
+ switch (cookie & 0xF000) {
+ case 0x1000:
+ ring = dma->tx_ring_AC_BK;
+ break;
+ case 0x2000:
+ ring = dma->tx_ring_AC_BE;
+ break;
+ case 0x3000:
+ ring = dma->tx_ring_AC_VI;
+ break;
+ case 0x4000:
+ ring = dma->tx_ring_AC_VO;
+ break;
+ case 0x5000:
+ ring = dma->tx_ring_mcast;
+ break;
+ }
+ *slot = (cookie & 0x0FFF);
+ if (unlikely(!ring || *slot < 0 || *slot >= ring->nr_slots)) {
+ b43dbg(dev->wl, "TX-status contains "
+ "invalid cookie: 0x%04X\n", cookie);
+ return NULL;
+ }
+
+ return ring;
+}
+
+static int dma_tx_fragment(struct b43_dmaring *ring,
+ struct sk_buff *skb)
+{
+ const struct b43_dma_ops *ops = ring->ops;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct b43_private_tx_info *priv_info = b43_get_priv_tx_info(info);
+ u8 *header;
+ int slot, old_top_slot, old_used_slots;
+ int err;
+ struct b43_dmadesc_generic *desc;
+ struct b43_dmadesc_meta *meta;
+ struct b43_dmadesc_meta *meta_hdr;
+ u16 cookie;
+ size_t hdrsize = b43_txhdr_size(ring->dev);
+
+ /* Important note: If the number of used DMA slots per TX frame
+ * is changed here, the TX_SLOTS_PER_FRAME definition at the top of
+ * the file has to be updated, too!
+ */
+
+ old_top_slot = ring->current_slot;
+ old_used_slots = ring->used_slots;
+
+ /* Get a slot for the header. */
+ slot = request_slot(ring);
+ desc = ops->idx2desc(ring, slot, &meta_hdr);
+ memset(meta_hdr, 0, sizeof(*meta_hdr));
+
+ header = &(ring->txhdr_cache[(slot / TX_SLOTS_PER_FRAME) * hdrsize]);
+ cookie = generate_cookie(ring, slot);
+ err = b43_generate_txhdr(ring->dev, header,
+ skb, info, cookie);
+ if (unlikely(err)) {
+ ring->current_slot = old_top_slot;
+ ring->used_slots = old_used_slots;
+ return err;
+ }
+
+ meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
+ hdrsize, 1);
+ if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize, 1)) {
+ ring->current_slot = old_top_slot;
+ ring->used_slots = old_used_slots;
+ return -EIO;
+ }
+ ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr,
+ hdrsize, 1, 0, 0);
+
+ /* Get a slot for the payload. */
+ slot = request_slot(ring);
+ desc = ops->idx2desc(ring, slot, &meta);
+ memset(meta, 0, sizeof(*meta));
+
+ meta->skb = skb;
+ meta->is_last_fragment = true;
+ priv_info->bouncebuffer = NULL;
+
+ meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
+ /* create a bounce buffer in zone_dma on mapping failure. */
+ if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
+ priv_info->bouncebuffer = kmemdup(skb->data, skb->len,
+ GFP_ATOMIC | GFP_DMA);
+ if (!priv_info->bouncebuffer) {
+ ring->current_slot = old_top_slot;
+ ring->used_slots = old_used_slots;
+ err = -ENOMEM;
+ goto out_unmap_hdr;
+ }
+
+ meta->dmaaddr = map_descbuffer(ring, priv_info->bouncebuffer, skb->len, 1);
+ if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
+ kfree(priv_info->bouncebuffer);
+ priv_info->bouncebuffer = NULL;
+ ring->current_slot = old_top_slot;
+ ring->used_slots = old_used_slots;
+ err = -EIO;
+ goto out_unmap_hdr;
+ }
+ }
+
+ ops->fill_descriptor(ring, desc, meta->dmaaddr, skb->len, 0, 1, 1);
+
+ if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
+ /* Tell the firmware about the cookie of the last
+ * mcast frame, so it can clear the more-data bit in it. */
+ b43_shm_write16(ring->dev, B43_SHM_SHARED,
+ B43_SHM_SH_MCASTCOOKIE, cookie);
+ }
+ /* Now transfer the whole frame. */
+ wmb();
+ ops->poke_tx(ring, next_slot(ring, slot));
+ return 0;
+
+out_unmap_hdr:
+ unmap_descbuffer(ring, meta_hdr->dmaaddr,
+ hdrsize, 1);
+ return err;
+}
+
+static inline int should_inject_overflow(struct b43_dmaring *ring)
+{
+#ifdef CONFIG_B43_DEBUG
+ if (unlikely(b43_debug(ring->dev, B43_DBG_DMAOVERFLOW))) {
+ /* Check if we should inject another ringbuffer overflow
+ * to test handling of this situation in the stack. */
+ unsigned long next_overflow;
+
+ next_overflow = ring->last_injected_overflow + HZ;
+ if (time_after(jiffies, next_overflow)) {
+ ring->last_injected_overflow = jiffies;
+ b43dbg(ring->dev->wl,
+ "Injecting TX ring overflow on "
+ "DMA controller %d\n", ring->index);
+ return 1;
+ }
+ }
+#endif /* CONFIG_B43_DEBUG */
+ return 0;
+}
+
+/* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */
+static struct b43_dmaring *select_ring_by_priority(struct b43_wldev *dev,
+ u8 queue_prio)
+{
+ struct b43_dmaring *ring;
+
+ if (dev->qos_enabled) {
+ /* 0 = highest priority */
+ switch (queue_prio) {
+ default:
+ B43_WARN_ON(1);
+ /* fallthrough */
+ case 0:
+ ring = dev->dma.tx_ring_AC_VO;
+ break;
+ case 1:
+ ring = dev->dma.tx_ring_AC_VI;
+ break;
+ case 2:
+ ring = dev->dma.tx_ring_AC_BE;
+ break;
+ case 3:
+ ring = dev->dma.tx_ring_AC_BK;
+ break;
+ }
+ } else
+ ring = dev->dma.tx_ring_AC_BE;
+
+ return ring;
+}
+
+int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb)
+{
+ struct b43_dmaring *ring;
+ struct ieee80211_hdr *hdr;
+ int err = 0;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
+ /* The multicast ring will be sent after the DTIM */
+ ring = dev->dma.tx_ring_mcast;
+ /* Set the more-data bit. Ucode will clear it on
+ * the last frame for us. */
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+ } else {
+ /* Decide by priority where to put this frame. */
+ ring = select_ring_by_priority(
+ dev, skb_get_queue_mapping(skb));
+ }
+
+ B43_WARN_ON(!ring->tx);
+
+ if (unlikely(ring->stopped)) {
+ /* We get here only because of a bug in mac80211.
+ * Because of a race, one packet may be queued after
+ * the queue is stopped, thus we got called when we shouldn't.
+ * For now, just refuse the transmit. */
+ if (b43_debug(dev, B43_DBG_DMAVERBOSE))
+ b43err(dev->wl, "Packet after queue stopped\n");
+ err = -ENOSPC;
+ goto out;
+ }
+
+ if (unlikely(WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME))) {
+ /* If we get here, we have a real error with the queue
+ * full, but queues not stopped. */
+ b43err(dev->wl, "DMA queue overflow\n");
+ err = -ENOSPC;
+ goto out;
+ }
+
+ /* Assign the queue number to the ring (if not already done before)
+ * so TX status handling can use it. The queue to ring mapping is
+ * static, so we don't need to store it per frame. */
+ ring->queue_prio = skb_get_queue_mapping(skb);
+
+ err = dma_tx_fragment(ring, skb);
+ if (unlikely(err == -ENOKEY)) {
+ /* Drop this packet, as we don't have the encryption key
+ * anymore and must not transmit it unencrypted. */
+ ieee80211_free_txskb(dev->wl->hw, skb);
+ err = 0;
+ goto out;
+ }
+ if (unlikely(err)) {
+ b43err(dev->wl, "DMA tx mapping failure\n");
+ goto out;
+ }
+ if ((free_slots(ring) < TX_SLOTS_PER_FRAME) ||
+ should_inject_overflow(ring)) {
+ /* This TX ring is full. */
+ unsigned int skb_mapping = skb_get_queue_mapping(skb);
+ ieee80211_stop_queue(dev->wl->hw, skb_mapping);
+ dev->wl->tx_queue_stopped[skb_mapping] = 1;
+ ring->stopped = true;
+ if (b43_debug(dev, B43_DBG_DMAVERBOSE)) {
+ b43dbg(dev->wl, "Stopped TX ring %d\n", ring->index);
+ }
+ }
+out:
+
+ return err;
+}
+
+void b43_dma_handle_txstatus(struct b43_wldev *dev,
+ const struct b43_txstatus *status)
+{
+ const struct b43_dma_ops *ops;
+ struct b43_dmaring *ring;
+ struct b43_dmadesc_meta *meta;
+ static const struct b43_txstatus fake; /* filled with 0 */
+ const struct b43_txstatus *txstat;
+ int slot, firstused;
+ bool frame_succeed;
+ int skip;
+ static u8 err_out1, err_out2;
+
+ ring = parse_cookie(dev, status->cookie, &slot);
+ if (unlikely(!ring))
+ return;
+ B43_WARN_ON(!ring->tx);
+
+ /* Sanity check: TX packets are processed in-order on one ring.
+ * Check if the slot deduced from the cookie really is the first
+ * used slot. */
+ firstused = ring->current_slot - ring->used_slots + 1;
+ if (firstused < 0)
+ firstused = ring->nr_slots + firstused;
+
+ skip = 0;
+ if (unlikely(slot != firstused)) {
+ /* This possibly is a firmware bug and will result in
+ * malfunction, memory leaks and/or stall of DMA functionality.
+ */
+ if (slot == next_slot(ring, next_slot(ring, firstused))) {
+ /* If a single header/data pair was missed, skip over
+ * the first two slots in an attempt to recover.
+ */
+ slot = firstused;
+ skip = 2;
+ if (!err_out1) {
+ /* Report the error once. */
+ b43dbg(dev->wl,
+ "Skip on DMA ring %d slot %d.\n",
+ ring->index, slot);
+ err_out1 = 1;
+ }
+ } else {
+ /* More than a single header/data pair were missed.
+ * Report this error once.
+ */
+ if (!err_out2)
+ b43dbg(dev->wl,
+ "Out of order TX status report on DMA ring %d. Expected %d, but got %d\n",
+ ring->index, firstused, slot);
+ err_out2 = 1;
+ return;
+ }
+ }
+
+ ops = ring->ops;
+ while (1) {
+ B43_WARN_ON(slot < 0 || slot >= ring->nr_slots);
+ /* get meta - ignore returned value */
+ ops->idx2desc(ring, slot, &meta);
+
+ if (b43_dma_ptr_is_poisoned(meta->skb)) {
+ b43dbg(dev->wl, "Poisoned TX slot %d (first=%d) "
+ "on ring %d\n",
+ slot, firstused, ring->index);
+ break;
+ }
+
+ if (meta->skb) {
+ struct b43_private_tx_info *priv_info =
+ b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb));
+
+ unmap_descbuffer(ring, meta->dmaaddr,
+ meta->skb->len, 1);
+ kfree(priv_info->bouncebuffer);
+ priv_info->bouncebuffer = NULL;
+ } else {
+ unmap_descbuffer(ring, meta->dmaaddr,
+ b43_txhdr_size(dev), 1);
+ }
+
+ if (meta->is_last_fragment) {
+ struct ieee80211_tx_info *info;
+
+ if (unlikely(!meta->skb)) {
+ /* This is a scatter-gather fragment of a frame,
+ * so the skb pointer must not be NULL.
+ */
+ b43dbg(dev->wl, "TX status unexpected NULL skb "
+ "at slot %d (first=%d) on ring %d\n",
+ slot, firstused, ring->index);
+ break;
+ }
+
+ info = IEEE80211_SKB_CB(meta->skb);
+
+ /*
+ * Call back to inform the ieee80211 subsystem about
+ * the status of the transmission. When skipping over
+ * a missed TX status report, use a status structure
+ * filled with zeros to indicate that the frame was not
+ * sent (frame_count 0) and not acknowledged
+ */
+ if (unlikely(skip))
+ txstat = &fake;
+ else
+ txstat = status;
+
+ frame_succeed = b43_fill_txstatus_report(dev, info,
+ txstat);
+#ifdef CONFIG_B43_DEBUG
+ if (frame_succeed)
+ ring->nr_succeed_tx_packets++;
+ else
+ ring->nr_failed_tx_packets++;
+ ring->nr_total_packet_tries += status->frame_count;
+#endif /* DEBUG */
+ ieee80211_tx_status(dev->wl->hw, meta->skb);
+
+ /* skb will be freed by ieee80211_tx_status().
+ * Poison our pointer. */
+ meta->skb = B43_DMA_PTR_POISON;
+ } else {
+ /* No need to call free_descriptor_buffer here, as
+ * this is only the txhdr, which is not allocated.
+ */
+ if (unlikely(meta->skb)) {
+ b43dbg(dev->wl, "TX status unexpected non-NULL skb "
+ "at slot %d (first=%d) on ring %d\n",
+ slot, firstused, ring->index);
+ break;
+ }
+ }
+
+ /* Everything unmapped and free'd. So it's not used anymore. */
+ ring->used_slots--;
+
+ if (meta->is_last_fragment && !skip) {
+ /* This is the last scatter-gather
+ * fragment of the frame. We are done. */
+ break;
+ }
+ slot = next_slot(ring, slot);
+ if (skip > 0)
+ --skip;
+ }
+ if (ring->stopped) {
+ B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME);
+ ring->stopped = false;
+ }
+
+ if (dev->wl->tx_queue_stopped[ring->queue_prio]) {
+ dev->wl->tx_queue_stopped[ring->queue_prio] = 0;
+ } else {
+ /* If the driver queue is running wake the corresponding
+ * mac80211 queue. */
+ ieee80211_wake_queue(dev->wl->hw, ring->queue_prio);
+ if (b43_debug(dev, B43_DBG_DMAVERBOSE)) {
+ b43dbg(dev->wl, "Woke up TX ring %d\n", ring->index);
+ }
+ }
+ /* Add work to the queue. */
+ ieee80211_queue_work(dev->wl->hw, &dev->wl->tx_work);
+}
+
+static void dma_rx(struct b43_dmaring *ring, int *slot)
+{
+ const struct b43_dma_ops *ops = ring->ops;
+ struct b43_dmadesc_generic *desc;
+ struct b43_dmadesc_meta *meta;
+ struct b43_rxhdr_fw4 *rxhdr;
+ struct sk_buff *skb;
+ u16 len;
+ int err;
+ dma_addr_t dmaaddr;
+
+ desc = ops->idx2desc(ring, *slot, &meta);
+
+ sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize);
+ skb = meta->skb;
+
+ rxhdr = (struct b43_rxhdr_fw4 *)skb->data;
+ len = le16_to_cpu(rxhdr->frame_len);
+ if (len == 0) {
+ int i = 0;
+
+ do {
+ udelay(2);
+ barrier();
+ len = le16_to_cpu(rxhdr->frame_len);
+ } while (len == 0 && i++ < 5);
+ if (unlikely(len == 0)) {
+ dmaaddr = meta->dmaaddr;
+ goto drop_recycle_buffer;
+ }
+ }
+ if (unlikely(b43_rx_buffer_is_poisoned(ring, skb))) {
+ /* Something went wrong with the DMA.
+ * The device did not touch the buffer and did not overwrite the poison. */
+ b43dbg(ring->dev->wl, "DMA RX: Dropping poisoned buffer.\n");
+ dmaaddr = meta->dmaaddr;
+ goto drop_recycle_buffer;
+ }
+ if (unlikely(len + ring->frameoffset > ring->rx_buffersize)) {
+ /* The data did not fit into one descriptor buffer
+ * and is split over multiple buffers.
+ * This should never happen, as we try to allocate buffers
+ * big enough. So simply ignore this packet.
+ */
+ int cnt = 0;
+ s32 tmp = len;
+
+ while (1) {
+ desc = ops->idx2desc(ring, *slot, &meta);
+ /* recycle the descriptor buffer. */
+ b43_poison_rx_buffer(ring, meta->skb);
+ sync_descbuffer_for_device(ring, meta->dmaaddr,
+ ring->rx_buffersize);
+ *slot = next_slot(ring, *slot);
+ cnt++;
+ tmp -= ring->rx_buffersize;
+ if (tmp <= 0)
+ break;
+ }
+ b43err(ring->dev->wl, "DMA RX buffer too small "
+ "(len: %u, buffer: %u, nr-dropped: %d)\n",
+ len, ring->rx_buffersize, cnt);
+ goto drop;
+ }
+
+ dmaaddr = meta->dmaaddr;
+ err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
+ if (unlikely(err)) {
+ b43dbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer() failed\n");
+ goto drop_recycle_buffer;
+ }
+
+ unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0);
+ skb_put(skb, len + ring->frameoffset);
+ skb_pull(skb, ring->frameoffset);
+
+ b43_rx(ring->dev, skb, rxhdr);
+drop:
+ return;
+
+drop_recycle_buffer:
+ /* Poison and recycle the RX buffer. */
+ b43_poison_rx_buffer(ring, skb);
+ sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize);
+}
+
+void b43_dma_handle_rx_overflow(struct b43_dmaring *ring)
+{
+ int current_slot, previous_slot;
+
+ B43_WARN_ON(ring->tx);
+
+ /* Device has filled all buffers, drop all packets and let TCP
+ * decrease speed.
+ * Decrement RX index by one will let the device to see all slots
+ * as free again
+ */
+ /*
+ *TODO: How to increase rx_drop in mac80211?
+ */
+ current_slot = ring->ops->get_current_rxslot(ring);
+ previous_slot = prev_slot(ring, current_slot);
+ ring->ops->set_current_rxslot(ring, previous_slot);
+}
+
+void b43_dma_rx(struct b43_dmaring *ring)
+{
+ const struct b43_dma_ops *ops = ring->ops;
+ int slot, current_slot;
+ int used_slots = 0;
+
+ B43_WARN_ON(ring->tx);
+ current_slot = ops->get_current_rxslot(ring);
+ B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots));
+
+ slot = ring->current_slot;
+ for (; slot != current_slot; slot = next_slot(ring, slot)) {
+ dma_rx(ring, &slot);
+ update_max_used_slots(ring, ++used_slots);
+ }
+ wmb();
+ ops->set_current_rxslot(ring, slot);
+ ring->current_slot = slot;
+}
+
+static void b43_dma_tx_suspend_ring(struct b43_dmaring *ring)
+{
+ B43_WARN_ON(!ring->tx);
+ ring->ops->tx_suspend(ring);
+}
+
+static void b43_dma_tx_resume_ring(struct b43_dmaring *ring)
+{
+ B43_WARN_ON(!ring->tx);
+ ring->ops->tx_resume(ring);
+}
+
+void b43_dma_tx_suspend(struct b43_wldev *dev)
+{
+ b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BK);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_BE);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VI);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_AC_VO);
+ b43_dma_tx_suspend_ring(dev->dma.tx_ring_mcast);
+}
+
+void b43_dma_tx_resume(struct b43_wldev *dev)
+{
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_mcast);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VO);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_VI);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BE);
+ b43_dma_tx_resume_ring(dev->dma.tx_ring_AC_BK);
+ b43_power_saving_ctl_bits(dev, 0);
+}
+
+static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type,
+ u16 mmio_base, bool enable)
+{
+ u32 ctl;
+
+ if (type == B43_DMA_64BIT) {
+ ctl = b43_read32(dev, mmio_base + B43_DMA64_RXCTL);
+ ctl &= ~B43_DMA64_RXDIRECTFIFO;
+ if (enable)
+ ctl |= B43_DMA64_RXDIRECTFIFO;
+ b43_write32(dev, mmio_base + B43_DMA64_RXCTL, ctl);
+ } else {
+ ctl = b43_read32(dev, mmio_base + B43_DMA32_RXCTL);
+ ctl &= ~B43_DMA32_RXDIRECTFIFO;
+ if (enable)
+ ctl |= B43_DMA32_RXDIRECTFIFO;
+ b43_write32(dev, mmio_base + B43_DMA32_RXCTL, ctl);
+ }
+}
+
+/* Enable/Disable Direct FIFO Receive Mode (PIO) on a RX engine.
+ * This is called from PIO code, so DMA structures are not available. */
+void b43_dma_direct_fifo_rx(struct b43_wldev *dev,
+ unsigned int engine_index, bool enable)
+{
+ enum b43_dmatype type;
+ u16 mmio_base;
+
+ type = dma_mask_to_engine_type(supported_dma_mask(dev));
+
+ mmio_base = b43_dmacontroller_base(type, engine_index);
+ direct_fifo_rx(dev, type, mmio_base, enable);
+}
Code Review / kvmfornfv.git / blobdiff