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Diffstat (limited to 'drivers/net/wireless/bcm43xx/bcm43xx_dma.c')
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_dma.c1263
1 files changed, 0 insertions, 1263 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_dma.c b/drivers/net/wireless/bcm43xx/bcm43xx_dma.c
deleted file mode 100644
index 1f7731f..0000000
--- a/drivers/net/wireless/bcm43xx/bcm43xx_dma.c
+++ /dev/null
@@ -1,1263 +0,0 @@
-/*
-
- Broadcom BCM43xx wireless driver
-
- DMA ringbuffer and descriptor allocation/management
-
- Copyright (c) 2005, 2006 Michael Buesch <mbuesch@freenet.de>
-
- 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 "bcm43xx.h"
-#include "bcm43xx_dma.h"
-#include "bcm43xx_main.h"
-#include "bcm43xx_debugfs.h"
-#include "bcm43xx_power.h"
-#include "bcm43xx_xmit.h"
-
-#include <linux/dma-mapping.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/skbuff.h>
-
-
-static inline int free_slots(struct bcm43xx_dmaring *ring)
-{
- return (ring->nr_slots - ring->used_slots);
-}
-
-static inline int next_slot(struct bcm43xx_dmaring *ring, int slot)
-{
- assert(slot >= -1 && slot <= ring->nr_slots - 1);
- if (slot == ring->nr_slots - 1)
- return 0;
- return slot + 1;
-}
-
-static inline int prev_slot(struct bcm43xx_dmaring *ring, int slot)
-{
- assert(slot >= 0 && slot <= ring->nr_slots - 1);
- if (slot == 0)
- return ring->nr_slots - 1;
- return slot - 1;
-}
-
-/* Request a slot for usage. */
-static inline
-int request_slot(struct bcm43xx_dmaring *ring)
-{
- int slot;
-
- assert(ring->tx);
- assert(!ring->suspended);
- assert(free_slots(ring) != 0);
-
- slot = next_slot(ring, ring->current_slot);
- ring->current_slot = slot;
- ring->used_slots++;
-
- /* Check the number of available slots and suspend TX,
- * if we are running low on free slots.
- */
- if (unlikely(free_slots(ring) < ring->suspend_mark)) {
- netif_stop_queue(ring->bcm->net_dev);
- ring->suspended = 1;
- }
-#ifdef CONFIG_BCM43XX_DEBUG
- if (ring->used_slots > ring->max_used_slots)
- ring->max_used_slots = ring->used_slots;
-#endif /* CONFIG_BCM43XX_DEBUG*/
-
- return slot;
-}
-
-/* Return a slot to the free slots. */
-static inline
-void return_slot(struct bcm43xx_dmaring *ring, int slot)
-{
- assert(ring->tx);
-
- ring->used_slots--;
-
- /* Check if TX is suspended and check if we have
- * enough free slots to resume it again.
- */
- if (unlikely(ring->suspended)) {
- if (free_slots(ring) >= ring->resume_mark) {
- ring->suspended = 0;
- netif_wake_queue(ring->bcm->net_dev);
- }
- }
-}
-
-u16 bcm43xx_dmacontroller_base(int dma64bit, int controller_idx)
-{
- static const u16 map64[] = {
- BCM43xx_MMIO_DMA64_BASE0,
- BCM43xx_MMIO_DMA64_BASE1,
- BCM43xx_MMIO_DMA64_BASE2,
- BCM43xx_MMIO_DMA64_BASE3,
- BCM43xx_MMIO_DMA64_BASE4,
- BCM43xx_MMIO_DMA64_BASE5,
- };
- static const u16 map32[] = {
- BCM43xx_MMIO_DMA32_BASE0,
- BCM43xx_MMIO_DMA32_BASE1,
- BCM43xx_MMIO_DMA32_BASE2,
- BCM43xx_MMIO_DMA32_BASE3,
- BCM43xx_MMIO_DMA32_BASE4,
- BCM43xx_MMIO_DMA32_BASE5,
- };
-
- if (dma64bit) {
- assert(controller_idx >= 0 &&
- controller_idx < ARRAY_SIZE(map64));
- return map64[controller_idx];
- }
- assert(controller_idx >= 0 &&
- controller_idx < ARRAY_SIZE(map32));
- return map32[controller_idx];
-}
-
-static inline
-dma_addr_t map_descbuffer(struct bcm43xx_dmaring *ring,
- unsigned char *buf,
- size_t len,
- int tx)
-{
- dma_addr_t dmaaddr;
- int direction = PCI_DMA_FROMDEVICE;
-
- if (tx)
- direction = PCI_DMA_TODEVICE;
-
- dmaaddr = pci_map_single(ring->bcm->pci_dev,
- buf, len,
- direction);
-
- return dmaaddr;
-}
-
-static inline
-void unmap_descbuffer(struct bcm43xx_dmaring *ring,
- dma_addr_t addr,
- size_t len,
- int tx)
-{
- if (tx) {
- pci_unmap_single(ring->bcm->pci_dev,
- addr, len,
- PCI_DMA_TODEVICE);
- } else {
- pci_unmap_single(ring->bcm->pci_dev,
- addr, len,
- PCI_DMA_FROMDEVICE);
- }
-}
-
-static inline
-void sync_descbuffer_for_cpu(struct bcm43xx_dmaring *ring,
- dma_addr_t addr,
- size_t len)
-{
- assert(!ring->tx);
-
- pci_dma_sync_single_for_cpu(ring->bcm->pci_dev,
- addr, len, PCI_DMA_FROMDEVICE);
-}
-
-static inline
-void sync_descbuffer_for_device(struct bcm43xx_dmaring *ring,
- dma_addr_t addr,
- size_t len)
-{
- assert(!ring->tx);
-
- pci_dma_sync_single_for_cpu(ring->bcm->pci_dev,
- addr, len, PCI_DMA_TODEVICE);
-}
-
-/* Unmap and free a descriptor buffer. */
-static inline
-void free_descriptor_buffer(struct bcm43xx_dmaring *ring,
- struct bcm43xx_dmadesc_meta *meta,
- int irq_context)
-{
- assert(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 bcm43xx_dmaring *ring)
-{
- ring->descbase = pci_alloc_consistent(ring->bcm->pci_dev, BCM43xx_DMA_RINGMEMSIZE,
- &(ring->dmabase));
- if (!ring->descbase) {
- /* Allocation may have failed due to pci_alloc_consistent
- insisting on use of GFP_DMA, which is more restrictive
- than necessary... */
- struct dma_desc *rx_ring;
- dma_addr_t rx_ring_dma;
-
- rx_ring = kzalloc(BCM43xx_DMA_RINGMEMSIZE, GFP_KERNEL);
- if (!rx_ring)
- goto out_err;
-
- rx_ring_dma = pci_map_single(ring->bcm->pci_dev, rx_ring,
- BCM43xx_DMA_RINGMEMSIZE,
- PCI_DMA_BIDIRECTIONAL);
-
- if (pci_dma_mapping_error(rx_ring_dma) ||
- rx_ring_dma + BCM43xx_DMA_RINGMEMSIZE > ring->bcm->dma_mask) {
- /* Sigh... */
- if (!pci_dma_mapping_error(rx_ring_dma))
- pci_unmap_single(ring->bcm->pci_dev,
- rx_ring_dma, BCM43xx_DMA_RINGMEMSIZE,
- PCI_DMA_BIDIRECTIONAL);
- rx_ring_dma = pci_map_single(ring->bcm->pci_dev,
- rx_ring, BCM43xx_DMA_RINGMEMSIZE,
- PCI_DMA_BIDIRECTIONAL);
- if (pci_dma_mapping_error(rx_ring_dma) ||
- rx_ring_dma + BCM43xx_DMA_RINGMEMSIZE > ring->bcm->dma_mask) {
- assert(0);
- if (!pci_dma_mapping_error(rx_ring_dma))
- pci_unmap_single(ring->bcm->pci_dev,
- rx_ring_dma, BCM43xx_DMA_RINGMEMSIZE,
- PCI_DMA_BIDIRECTIONAL);
- goto out_err;
- }
- }
-
- ring->descbase = rx_ring;
- ring->dmabase = rx_ring_dma;
- }
- memset(ring->descbase, 0, BCM43xx_DMA_RINGMEMSIZE);
-
- return 0;
-out_err:
- printk(KERN_ERR PFX "DMA ringmemory allocation failed\n");
- return -ENOMEM;
-}
-
-static void free_ringmemory(struct bcm43xx_dmaring *ring)
-{
- struct device *dev = &(ring->bcm->pci_dev->dev);
-
- dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE,
- ring->descbase, ring->dmabase);
-}
-
-/* Reset the RX DMA channel */
-int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm,
- u16 mmio_base, int dma64)
-{
- int i;
- u32 value;
- u16 offset;
-
- offset = dma64 ? BCM43xx_DMA64_RXCTL : BCM43xx_DMA32_RXCTL;
- bcm43xx_write32(bcm, mmio_base + offset, 0);
- for (i = 0; i < 1000; i++) {
- offset = dma64 ? BCM43xx_DMA64_RXSTATUS : BCM43xx_DMA32_RXSTATUS;
- value = bcm43xx_read32(bcm, mmio_base + offset);
- if (dma64) {
- value &= BCM43xx_DMA64_RXSTAT;
- if (value == BCM43xx_DMA64_RXSTAT_DISABLED) {
- i = -1;
- break;
- }
- } else {
- value &= BCM43xx_DMA32_RXSTATE;
- if (value == BCM43xx_DMA32_RXSTAT_DISABLED) {
- i = -1;
- break;
- }
- }
- udelay(10);
- }
- if (i != -1) {
- printk(KERN_ERR PFX "Error: Wait on DMA RX status timed out.\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-/* Reset the RX DMA channel */
-int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm,
- u16 mmio_base, int dma64)
-{
- int i;
- u32 value;
- u16 offset;
-
- for (i = 0; i < 1000; i++) {
- offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS;
- value = bcm43xx_read32(bcm, mmio_base + offset);
- if (dma64) {
- value &= BCM43xx_DMA64_TXSTAT;
- if (value == BCM43xx_DMA64_TXSTAT_DISABLED ||
- value == BCM43xx_DMA64_TXSTAT_IDLEWAIT ||
- value == BCM43xx_DMA64_TXSTAT_STOPPED)
- break;
- } else {
- value &= BCM43xx_DMA32_TXSTATE;
- if (value == BCM43xx_DMA32_TXSTAT_DISABLED ||
- value == BCM43xx_DMA32_TXSTAT_IDLEWAIT ||
- value == BCM43xx_DMA32_TXSTAT_STOPPED)
- break;
- }
- udelay(10);
- }
- offset = dma64 ? BCM43xx_DMA64_TXCTL : BCM43xx_DMA32_TXCTL;
- bcm43xx_write32(bcm, mmio_base + offset, 0);
- for (i = 0; i < 1000; i++) {
- offset = dma64 ? BCM43xx_DMA64_TXSTATUS : BCM43xx_DMA32_TXSTATUS;
- value = bcm43xx_read32(bcm, mmio_base + offset);
- if (dma64) {
- value &= BCM43xx_DMA64_TXSTAT;
- if (value == BCM43xx_DMA64_TXSTAT_DISABLED) {
- i = -1;
- break;
- }
- } else {
- value &= BCM43xx_DMA32_TXSTATE;
- if (value == BCM43xx_DMA32_TXSTAT_DISABLED) {
- i = -1;
- break;
- }
- }
- udelay(10);
- }
- if (i != -1) {
- printk(KERN_ERR PFX "Error: Wait on DMA TX status timed out.\n");
- return -ENODEV;
- }
- /* ensure the reset is completed. */
- udelay(300);
-
- return 0;
-}
-
-static void fill_descriptor(struct bcm43xx_dmaring *ring,
- struct bcm43xx_dmadesc_generic *desc,
- dma_addr_t dmaaddr,
- u16 bufsize,
- int start, int end, int irq)
-{
- int slot;
-
- slot = bcm43xx_dma_desc2idx(ring, desc);
- assert(slot >= 0 && slot < ring->nr_slots);
-
- if (ring->dma64) {
- u32 ctl0 = 0, ctl1 = 0;
- u32 addrlo, addrhi;
- u32 addrext;
-
- addrlo = (u32)(dmaaddr & 0xFFFFFFFF);
- addrhi = (((u64)dmaaddr >> 32) & ~BCM43xx_DMA64_ROUTING);
- addrext = (((u64)dmaaddr >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT);
- addrhi |= ring->routing;
- if (slot == ring->nr_slots - 1)
- ctl0 |= BCM43xx_DMA64_DCTL0_DTABLEEND;
- if (start)
- ctl0 |= BCM43xx_DMA64_DCTL0_FRAMESTART;
- if (end)
- ctl0 |= BCM43xx_DMA64_DCTL0_FRAMEEND;
- if (irq)
- ctl0 |= BCM43xx_DMA64_DCTL0_IRQ;
- ctl1 |= (bufsize - ring->frameoffset)
- & BCM43xx_DMA64_DCTL1_BYTECNT;
- ctl1 |= (addrext << BCM43xx_DMA64_DCTL1_ADDREXT_SHIFT)
- & BCM43xx_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);
- } else {
- u32 ctl;
- u32 addr;
- u32 addrext;
-
- addr = (u32)(dmaaddr & ~BCM43xx_DMA32_ROUTING);
- addrext = (u32)(dmaaddr & BCM43xx_DMA32_ROUTING)
- >> BCM43xx_DMA32_ROUTING_SHIFT;
- addr |= ring->routing;
- ctl = (bufsize - ring->frameoffset)
- & BCM43xx_DMA32_DCTL_BYTECNT;
- if (slot == ring->nr_slots - 1)
- ctl |= BCM43xx_DMA32_DCTL_DTABLEEND;
- if (start)
- ctl |= BCM43xx_DMA32_DCTL_FRAMESTART;
- if (end)
- ctl |= BCM43xx_DMA32_DCTL_FRAMEEND;
- if (irq)
- ctl |= BCM43xx_DMA32_DCTL_IRQ;
- ctl |= (addrext << BCM43xx_DMA32_DCTL_ADDREXT_SHIFT)
- & BCM43xx_DMA32_DCTL_ADDREXT_MASK;
-
- desc->dma32.control = cpu_to_le32(ctl);
- desc->dma32.address = cpu_to_le32(addr);
- }
-}
-
-static int setup_rx_descbuffer(struct bcm43xx_dmaring *ring,
- struct bcm43xx_dmadesc_generic *desc,
- struct bcm43xx_dmadesc_meta *meta,
- gfp_t gfp_flags)
-{
- struct bcm43xx_rxhdr *rxhdr;
- struct bcm43xx_hwxmitstatus *xmitstat;
- dma_addr_t dmaaddr;
- struct sk_buff *skb;
-
- assert(!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);
- /* This hardware bug work-around adapted from the b44 driver.
- The chip may be unable to do PCI DMA to/from anything above 1GB */
- if (pci_dma_mapping_error(dmaaddr) ||
- dmaaddr + ring->rx_buffersize > ring->bcm->dma_mask) {
- /* This one has 30-bit addressing... */
- if (!pci_dma_mapping_error(dmaaddr))
- pci_unmap_single(ring->bcm->pci_dev,
- dmaaddr, ring->rx_buffersize,
- PCI_DMA_FROMDEVICE);
- dev_kfree_skb_any(skb);
- skb = __dev_alloc_skb(ring->rx_buffersize,GFP_DMA);
- if (skb == NULL)
- return -ENOMEM;
- dmaaddr = pci_map_single(ring->bcm->pci_dev,
- skb->data, ring->rx_buffersize,
- PCI_DMA_FROMDEVICE);
- if (pci_dma_mapping_error(dmaaddr) ||
- dmaaddr + ring->rx_buffersize > ring->bcm->dma_mask) {
- assert(0);
- dev_kfree_skb_any(skb);
- return -ENOMEM;
- }
- }
- meta->skb = skb;
- meta->dmaaddr = dmaaddr;
- skb->dev = ring->bcm->net_dev;
-
- fill_descriptor(ring, desc, dmaaddr,
- ring->rx_buffersize, 0, 0, 0);
-
- rxhdr = (struct bcm43xx_rxhdr *)(skb->data);
- rxhdr->frame_length = 0;
- rxhdr->flags1 = 0;
- xmitstat = (struct bcm43xx_hwxmitstatus *)(skb->data);
- xmitstat->cookie = 0;
-
- return 0;
-}
-
-/* Allocate the initial descbuffers.
- * This is used for an RX ring only.
- */
-static int alloc_initial_descbuffers(struct bcm43xx_dmaring *ring)
-{
- int i, err = -ENOMEM;
- struct bcm43xx_dmadesc_generic *desc;
- struct bcm43xx_dmadesc_meta *meta;
-
- for (i = 0; i < ring->nr_slots; i++) {
- desc = bcm43xx_dma_idx2desc(ring, i, &meta);
-
- err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL);
- if (err)
- goto err_unwind;
- }
- mb();
- ring->used_slots = ring->nr_slots;
- err = 0;
-out:
- return err;
-
-err_unwind:
- for (i--; i >= 0; i--) {
- desc = bcm43xx_dma_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 bcm43xx_dmaring *ring)
-{
- int err = 0;
- u32 value;
- u32 addrext;
-
- if (ring->tx) {
- if (ring->dma64) {
- u64 ringbase = (u64)(ring->dmabase);
-
- addrext = ((ringbase >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT);
- value = BCM43xx_DMA64_TXENABLE;
- value |= (addrext << BCM43xx_DMA64_TXADDREXT_SHIFT)
- & BCM43xx_DMA64_TXADDREXT_MASK;
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL, value);
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO,
- (ringbase & 0xFFFFFFFF));
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI,
- ((ringbase >> 32) & ~BCM43xx_DMA64_ROUTING)
- | ring->routing);
- } else {
- u32 ringbase = (u32)(ring->dmabase);
-
- addrext = (ringbase >> BCM43xx_DMA32_ROUTING_SHIFT);
- value = BCM43xx_DMA32_TXENABLE;
- value |= (addrext << BCM43xx_DMA32_TXADDREXT_SHIFT)
- & BCM43xx_DMA32_TXADDREXT_MASK;
- bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL, value);
- bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING,
- (ringbase & ~BCM43xx_DMA32_ROUTING)
- | ring->routing);
- }
- } else {
- err = alloc_initial_descbuffers(ring);
- if (err)
- goto out;
- if (ring->dma64) {
- u64 ringbase = (u64)(ring->dmabase);
-
- addrext = ((ringbase >> 32) >> BCM43xx_DMA64_ROUTING_SHIFT);
- value = (ring->frameoffset << BCM43xx_DMA64_RXFROFF_SHIFT);
- value |= BCM43xx_DMA64_RXENABLE;
- value |= (addrext << BCM43xx_DMA64_RXADDREXT_SHIFT)
- & BCM43xx_DMA64_RXADDREXT_MASK;
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXCTL, value);
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO,
- (ringbase & 0xFFFFFFFF));
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI,
- ((ringbase >> 32) & ~BCM43xx_DMA64_ROUTING)
- | ring->routing);
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX, 200);
- } else {
- u32 ringbase = (u32)(ring->dmabase);
-
- addrext = (ringbase >> BCM43xx_DMA32_ROUTING_SHIFT);
- value = (ring->frameoffset << BCM43xx_DMA32_RXFROFF_SHIFT);
- value |= BCM43xx_DMA32_RXENABLE;
- value |= (addrext << BCM43xx_DMA32_RXADDREXT_SHIFT)
- & BCM43xx_DMA32_RXADDREXT_MASK;
- bcm43xx_dma_write(ring, BCM43xx_DMA32_RXCTL, value);
- bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING,
- (ringbase & ~BCM43xx_DMA32_ROUTING)
- | ring->routing);
- bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX, 200);
- }
- }
-
-out:
- return err;
-}
-
-/* Shutdown the DMA controller. */
-static void dmacontroller_cleanup(struct bcm43xx_dmaring *ring)
-{
- if (ring->tx) {
- bcm43xx_dmacontroller_tx_reset(ring->bcm, ring->mmio_base, ring->dma64);
- if (ring->dma64) {
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGLO, 0);
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXRINGHI, 0);
- } else
- bcm43xx_dma_write(ring, BCM43xx_DMA32_TXRING, 0);
- } else {
- bcm43xx_dmacontroller_rx_reset(ring->bcm, ring->mmio_base, ring->dma64);
- if (ring->dma64) {
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGLO, 0);
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXRINGHI, 0);
- } else
- bcm43xx_dma_write(ring, BCM43xx_DMA32_RXRING, 0);
- }
-}
-
-static void free_all_descbuffers(struct bcm43xx_dmaring *ring)
-{
- struct bcm43xx_dmadesc_generic *desc;
- struct bcm43xx_dmadesc_meta *meta;
- int i;
-
- if (!ring->used_slots)
- return;
- for (i = 0; i < ring->nr_slots; i++) {
- desc = bcm43xx_dma_idx2desc(ring, i, &meta);
-
- if (!meta->skb) {
- assert(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);
- }
-}
-
-/* Main initialization function. */
-static
-struct bcm43xx_dmaring * bcm43xx_setup_dmaring(struct bcm43xx_private *bcm,
- int controller_index,
- int for_tx,
- int dma64)
-{
- struct bcm43xx_dmaring *ring;
- int err;
- int nr_slots;
-
- ring = kzalloc(sizeof(*ring), GFP_KERNEL);
- if (!ring)
- goto out;
-
- nr_slots = BCM43xx_RXRING_SLOTS;
- if (for_tx)
- nr_slots = BCM43xx_TXRING_SLOTS;
-
- ring->meta = kcalloc(nr_slots, sizeof(struct bcm43xx_dmadesc_meta),
- GFP_KERNEL);
- if (!ring->meta)
- goto err_kfree_ring;
-
- ring->routing = BCM43xx_DMA32_CLIENTTRANS;
- if (dma64)
- ring->routing = BCM43xx_DMA64_CLIENTTRANS;
-
- ring->bcm = bcm;
- ring->nr_slots = nr_slots;
- ring->suspend_mark = ring->nr_slots * BCM43xx_TXSUSPEND_PERCENT / 100;
- ring->resume_mark = ring->nr_slots * BCM43xx_TXRESUME_PERCENT / 100;
- assert(ring->suspend_mark < ring->resume_mark);
- ring->mmio_base = bcm43xx_dmacontroller_base(dma64, controller_index);
- ring->index = controller_index;
- ring->dma64 = !!dma64;
- if (for_tx) {
- ring->tx = 1;
- ring->current_slot = -1;
- } else {
- if (ring->index == 0) {
- ring->rx_buffersize = BCM43xx_DMA0_RX_BUFFERSIZE;
- ring->frameoffset = BCM43xx_DMA0_RX_FRAMEOFFSET;
- } else if (ring->index == 3) {
- ring->rx_buffersize = BCM43xx_DMA3_RX_BUFFERSIZE;
- ring->frameoffset = BCM43xx_DMA3_RX_FRAMEOFFSET;
- } else
- assert(0);
- }
-
- err = alloc_ringmemory(ring);
- if (err)
- goto err_kfree_meta;
- err = dmacontroller_setup(ring);
- if (err)
- goto err_free_ringmemory;
- return ring;
-
-out:
- printk(KERN_ERR PFX "Error in bcm43xx_setup_dmaring\n");
- return ring;
-
-err_free_ringmemory:
- free_ringmemory(ring);
-err_kfree_meta:
- kfree(ring->meta);
-err_kfree_ring:
- kfree(ring);
- ring = NULL;
- goto out;
-}
-
-/* Main cleanup function. */
-static void bcm43xx_destroy_dmaring(struct bcm43xx_dmaring *ring)
-{
- if (!ring)
- return;
-
- dprintk(KERN_INFO PFX "DMA-%s 0x%04X (%s) max used slots: %d/%d\n",
- (ring->dma64) ? "64" : "32",
- 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->meta);
- kfree(ring);
-}
-
-void bcm43xx_dma_free(struct bcm43xx_private *bcm)
-{
- struct bcm43xx_dma *dma;
-
- if (bcm43xx_using_pio(bcm))
- return;
- dma = bcm43xx_current_dma(bcm);
-
- bcm43xx_destroy_dmaring(dma->rx_ring3);
- dma->rx_ring3 = NULL;
- bcm43xx_destroy_dmaring(dma->rx_ring0);
- dma->rx_ring0 = NULL;
-
- bcm43xx_destroy_dmaring(dma->tx_ring5);
- dma->tx_ring5 = NULL;
- bcm43xx_destroy_dmaring(dma->tx_ring4);
- dma->tx_ring4 = NULL;
- bcm43xx_destroy_dmaring(dma->tx_ring3);
- dma->tx_ring3 = NULL;
- bcm43xx_destroy_dmaring(dma->tx_ring2);
- dma->tx_ring2 = NULL;
- bcm43xx_destroy_dmaring(dma->tx_ring1);
- dma->tx_ring1 = NULL;
- bcm43xx_destroy_dmaring(dma->tx_ring0);
- dma->tx_ring0 = NULL;
-}
-
-int bcm43xx_dma_init(struct bcm43xx_private *bcm)
-{
- struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm);
- struct bcm43xx_dmaring *ring;
- int err = -ENOMEM;
- int dma64 = 0;
-
- bcm->dma_mask = bcm43xx_get_supported_dma_mask(bcm);
- if (bcm->dma_mask == DMA_64BIT_MASK)
- dma64 = 1;
- err = pci_set_dma_mask(bcm->pci_dev, bcm->dma_mask);
- if (err)
- goto no_dma;
- err = pci_set_consistent_dma_mask(bcm->pci_dev, bcm->dma_mask);
- if (err)
- goto no_dma;
-
- /* setup TX DMA channels. */
- ring = bcm43xx_setup_dmaring(bcm, 0, 1, dma64);
- if (!ring)
- goto out;
- dma->tx_ring0 = ring;
-
- ring = bcm43xx_setup_dmaring(bcm, 1, 1, dma64);
- if (!ring)
- goto err_destroy_tx0;
- dma->tx_ring1 = ring;
-
- ring = bcm43xx_setup_dmaring(bcm, 2, 1, dma64);
- if (!ring)
- goto err_destroy_tx1;
- dma->tx_ring2 = ring;
-
- ring = bcm43xx_setup_dmaring(bcm, 3, 1, dma64);
- if (!ring)
- goto err_destroy_tx2;
- dma->tx_ring3 = ring;
-
- ring = bcm43xx_setup_dmaring(bcm, 4, 1, dma64);
- if (!ring)
- goto err_destroy_tx3;
- dma->tx_ring4 = ring;
-
- ring = bcm43xx_setup_dmaring(bcm, 5, 1, dma64);
- if (!ring)
- goto err_destroy_tx4;
- dma->tx_ring5 = ring;
-
- /* setup RX DMA channels. */
- ring = bcm43xx_setup_dmaring(bcm, 0, 0, dma64);
- if (!ring)
- goto err_destroy_tx5;
- dma->rx_ring0 = ring;
-
- if (bcm->current_core->rev < 5) {
- ring = bcm43xx_setup_dmaring(bcm, 3, 0, dma64);
- if (!ring)
- goto err_destroy_rx0;
- dma->rx_ring3 = ring;
- }
-
- dprintk(KERN_INFO PFX "%d-bit DMA initialized\n",
- (bcm->dma_mask == DMA_64BIT_MASK) ? 64 :
- (bcm->dma_mask == DMA_32BIT_MASK) ? 32 : 30);
- err = 0;
-out:
- return err;
-
-err_destroy_rx0:
- bcm43xx_destroy_dmaring(dma->rx_ring0);
- dma->rx_ring0 = NULL;
-err_destroy_tx5:
- bcm43xx_destroy_dmaring(dma->tx_ring5);
- dma->tx_ring5 = NULL;
-err_destroy_tx4:
- bcm43xx_destroy_dmaring(dma->tx_ring4);
- dma->tx_ring4 = NULL;
-err_destroy_tx3:
- bcm43xx_destroy_dmaring(dma->tx_ring3);
- dma->tx_ring3 = NULL;
-err_destroy_tx2:
- bcm43xx_destroy_dmaring(dma->tx_ring2);
- dma->tx_ring2 = NULL;
-err_destroy_tx1:
- bcm43xx_destroy_dmaring(dma->tx_ring1);
- dma->tx_ring1 = NULL;
-err_destroy_tx0:
- bcm43xx_destroy_dmaring(dma->tx_ring0);
- dma->tx_ring0 = NULL;
-no_dma:
-#ifdef CONFIG_BCM43XX_PIO
- printk(KERN_WARNING PFX "DMA not supported on this device."
- " Falling back to PIO.\n");
- bcm->__using_pio = 1;
- return -ENOSYS;
-#else
- printk(KERN_ERR PFX "FATAL: DMA not supported and PIO not configured. "
- "Please recompile the driver with PIO support.\n");
- return -ENODEV;
-#endif /* CONFIG_BCM43XX_PIO */
-}
-
-/* Generate a cookie for the TX header. */
-static u16 generate_cookie(struct bcm43xx_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;
- }
- assert(((u16)slot & 0xF000) == 0x0000);
- cookie |= (u16)slot;
-
- return cookie;
-}
-
-/* Inspect a cookie and find out to which controller/slot it belongs. */
-static
-struct bcm43xx_dmaring * parse_cookie(struct bcm43xx_private *bcm,
- u16 cookie, int *slot)
-{
- struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm);
- struct bcm43xx_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:
- assert(0);
- }
- *slot = (cookie & 0x0FFF);
- assert(*slot >= 0 && *slot < ring->nr_slots);
-
- return ring;
-}
-
-static void dmacontroller_poke_tx(struct bcm43xx_dmaring *ring,
- int slot)
-{
- u16 offset;
- int descsize;
-
- /* Everything is ready to start. Buffers are DMA mapped and
- * associated with slots.
- * "slot" is the last slot of the new frame we want to transmit.
- * Close your seat belts now, please.
- */
- wmb();
- slot = next_slot(ring, slot);
- offset = (ring->dma64) ? BCM43xx_DMA64_TXINDEX : BCM43xx_DMA32_TXINDEX;
- descsize = (ring->dma64) ? sizeof(struct bcm43xx_dmadesc64)
- : sizeof(struct bcm43xx_dmadesc32);
- bcm43xx_dma_write(ring, offset,
- (u32)(slot * descsize));
-}
-
-static void dma_tx_fragment(struct bcm43xx_dmaring *ring,
- struct sk_buff *skb,
- u8 cur_frag)
-{
- int slot;
- struct bcm43xx_dmadesc_generic *desc;
- struct bcm43xx_dmadesc_meta *meta;
- dma_addr_t dmaaddr;
- struct sk_buff *bounce_skb;
-
- assert(skb_shinfo(skb)->nr_frags == 0);
-
- slot = request_slot(ring);
- desc = bcm43xx_dma_idx2desc(ring, slot, &meta);
-
- /* Add a device specific TX header. */
- assert(skb_headroom(skb) >= sizeof(struct bcm43xx_txhdr));
- /* Reserve enough headroom for the device tx header. */
- __skb_push(skb, sizeof(struct bcm43xx_txhdr));
- /* Now calculate and add the tx header.
- * The tx header includes the PLCP header.
- */
- bcm43xx_generate_txhdr(ring->bcm,
- (struct bcm43xx_txhdr *)skb->data,
- skb->data + sizeof(struct bcm43xx_txhdr),
- skb->len - sizeof(struct bcm43xx_txhdr),
- (cur_frag == 0),
- generate_cookie(ring, slot));
- dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
- if (dma_mapping_error(dmaaddr) || dmaaddr + skb->len > ring->bcm->dma_mask) {
- /* chip cannot handle DMA to/from > 1GB, use bounce buffer (copied from b44 driver) */
- if (!dma_mapping_error(dmaaddr))
- unmap_descbuffer(ring, dmaaddr, skb->len, 1);
- bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC|GFP_DMA);
- if (!bounce_skb)
- return;
- dmaaddr = map_descbuffer(ring, bounce_skb->data, bounce_skb->len, 1);
- if (dma_mapping_error(dmaaddr) || dmaaddr + skb->len > ring->bcm->dma_mask) {
- if (!dma_mapping_error(dmaaddr))
- unmap_descbuffer(ring, dmaaddr, skb->len, 1);
- dev_kfree_skb_any(bounce_skb);
- assert(0);
- return;
- }
- skb_copy_from_linear_data(skb, skb_put(bounce_skb, skb->len),
- skb->len);
- dev_kfree_skb_any(skb);
- skb = bounce_skb;
- }
-
- meta->skb = skb;
- meta->dmaaddr = dmaaddr;
-
- fill_descriptor(ring, desc, dmaaddr,
- skb->len, 1, 1, 1);
-
- /* Now transfer the whole frame. */
- dmacontroller_poke_tx(ring, slot);
-}
-
-int bcm43xx_dma_tx(struct bcm43xx_private *bcm,
- struct ieee80211_txb *txb)
-{
- /* We just received a packet from the kernel network subsystem.
- * Add headers and DMA map the memory. Poke
- * the device to send the stuff.
- * Note that this is called from atomic context.
- */
- struct bcm43xx_dmaring *ring = bcm43xx_current_dma(bcm)->tx_ring1;
- u8 i;
- struct sk_buff *skb;
-
- assert(ring->tx);
- if (unlikely(free_slots(ring) < txb->nr_frags)) {
- /* The queue should be stopped,
- * if we are low on free slots.
- * If this ever triggers, we have to lower the suspend_mark.
- */
- dprintkl(KERN_ERR PFX "Out of DMA descriptor slots!\n");
- return -ENOMEM;
- }
-
- for (i = 0; i < txb->nr_frags; i++) {
- skb = txb->fragments[i];
- /* Take skb from ieee80211_txb_free */
- txb->fragments[i] = NULL;
- dma_tx_fragment(ring, skb, i);
- }
- ieee80211_txb_free(txb);
-
- return 0;
-}
-
-void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm,
- struct bcm43xx_xmitstatus *status)
-{
- struct bcm43xx_dmaring *ring;
- struct bcm43xx_dmadesc_generic *desc;
- struct bcm43xx_dmadesc_meta *meta;
- int is_last_fragment;
- int slot;
- u32 tmp;
-
- ring = parse_cookie(bcm, status->cookie, &slot);
- assert(ring);
- assert(ring->tx);
- while (1) {
- assert(slot >= 0 && slot < ring->nr_slots);
- desc = bcm43xx_dma_idx2desc(ring, slot, &meta);
-
- if (ring->dma64) {
- tmp = le32_to_cpu(desc->dma64.control0);
- is_last_fragment = !!(tmp & BCM43xx_DMA64_DCTL0_FRAMEEND);
- } else {
- tmp = le32_to_cpu(desc->dma32.control);
- is_last_fragment = !!(tmp & BCM43xx_DMA32_DCTL_FRAMEEND);
- }
- unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1);
- free_descriptor_buffer(ring, meta, 1);
- /* Everything belonging to the slot is unmapped
- * and freed, so we can return it.
- */
- return_slot(ring, slot);
-
- if (is_last_fragment)
- break;
- slot = next_slot(ring, slot);
- }
- bcm->stats.last_tx = jiffies;
-}
-
-static void dma_rx(struct bcm43xx_dmaring *ring,
- int *slot)
-{
- struct bcm43xx_dmadesc_generic *desc;
- struct bcm43xx_dmadesc_meta *meta;
- struct bcm43xx_rxhdr *rxhdr;
- struct sk_buff *skb;
- u16 len;
- int err;
- dma_addr_t dmaaddr;
-
- desc = bcm43xx_dma_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 bcm43xx_hwxmitstatus *hw = (struct bcm43xx_hwxmitstatus *)skb->data;
- struct bcm43xx_xmitstatus stat;
- int i = 0;
-
- stat.cookie = le16_to_cpu(hw->cookie);
- while (stat.cookie == 0) {
- if (unlikely(++i >= 10000)) {
- assert(0);
- break;
- }
- udelay(2);
- barrier();
- stat.cookie = le16_to_cpu(hw->cookie);
- }
- stat.flags = hw->flags;
- stat.cnt1 = hw->cnt1;
- stat.cnt2 = hw->cnt2;
- stat.seq = le16_to_cpu(hw->seq);
- stat.unknown = le16_to_cpu(hw->unknown);
-
- bcm43xx_debugfs_log_txstat(ring->bcm, &stat);
- bcm43xx_dma_handle_xmitstatus(ring->bcm, &stat);
- /* recycle the descriptor buffer. */
- sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize);
-
- return;
- }
- rxhdr = (struct bcm43xx_rxhdr *)skb->data;
- len = le16_to_cpu(rxhdr->frame_length);
- if (len == 0) {
- int i = 0;
-
- do {
- udelay(2);
- barrier();
- len = le16_to_cpu(rxhdr->frame_length);
- } 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 = bcm43xx_dma_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;
- }
- printkl(KERN_ERR PFX "DMA RX buffer too small "
- "(len: %u, buffer: %u, nr-dropped: %d)\n",
- len, ring->rx_buffersize, cnt);
- goto drop;
- }
- len -= IEEE80211_FCS_LEN;
-
- dmaaddr = meta->dmaaddr;
- err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC);
- if (unlikely(err)) {
- dprintkl(KERN_ERR PFX "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);
-
- err = bcm43xx_rx(ring->bcm, skb, rxhdr);
- if (err) {
- dev_kfree_skb_irq(skb);
- goto drop;
- }
-
-drop:
- return;
-}
-
-void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
-{
- u32 status;
- u16 descptr;
- int slot, current_slot;
-#ifdef CONFIG_BCM43XX_DEBUG
- int used_slots = 0;
-#endif
-
- assert(!ring->tx);
- if (ring->dma64) {
- status = bcm43xx_dma_read(ring, BCM43xx_DMA64_RXSTATUS);
- descptr = (status & BCM43xx_DMA64_RXSTATDPTR);
- current_slot = descptr / sizeof(struct bcm43xx_dmadesc64);
- } else {
- status = bcm43xx_dma_read(ring, BCM43xx_DMA32_RXSTATUS);
- descptr = (status & BCM43xx_DMA32_RXDPTR);
- current_slot = descptr / sizeof(struct bcm43xx_dmadesc32);
- }
- assert(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);
-#ifdef CONFIG_BCM43XX_DEBUG
- if (++used_slots > ring->max_used_slots)
- ring->max_used_slots = used_slots;
-#endif
- }
- if (ring->dma64) {
- bcm43xx_dma_write(ring, BCM43xx_DMA64_RXINDEX,
- (u32)(slot * sizeof(struct bcm43xx_dmadesc64)));
- } else {
- bcm43xx_dma_write(ring, BCM43xx_DMA32_RXINDEX,
- (u32)(slot * sizeof(struct bcm43xx_dmadesc32)));
- }
- ring->current_slot = slot;
-}
-
-void bcm43xx_dma_tx_suspend(struct bcm43xx_dmaring *ring)
-{
- assert(ring->tx);
- bcm43xx_power_saving_ctl_bits(ring->bcm, -1, 1);
- if (ring->dma64) {
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL,
- bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL)
- | BCM43xx_DMA64_TXSUSPEND);
- } else {
- bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL,
- bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL)
- | BCM43xx_DMA32_TXSUSPEND);
- }
-}
-
-void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring)
-{
- assert(ring->tx);
- if (ring->dma64) {
- bcm43xx_dma_write(ring, BCM43xx_DMA64_TXCTL,
- bcm43xx_dma_read(ring, BCM43xx_DMA64_TXCTL)
- & ~BCM43xx_DMA64_TXSUSPEND);
- } else {
- bcm43xx_dma_write(ring, BCM43xx_DMA32_TXCTL,
- bcm43xx_dma_read(ring, BCM43xx_DMA32_TXCTL)
- & ~BCM43xx_DMA32_TXSUSPEND);
- }
- bcm43xx_power_saving_ctl_bits(ring->bcm, -1, -1);
-}
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