diff options
Diffstat (limited to 'drivers/net/wireless/bcm43xx/bcm43xx_dma.c')
| -rw-r--r-- | drivers/net/wireless/bcm43xx/bcm43xx_dma.c | 969 |
1 files changed, 0 insertions, 969 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_dma.c b/drivers/net/wireless/bcm43xx/bcm43xx_dma.c deleted file mode 100644 index bbecba02e69..00000000000 --- a/drivers/net/wireless/bcm43xx/bcm43xx_dma.c +++ /dev/null @@ -1,969 +0,0 @@ -/* - - Broadcom BCM43xx wireless driver - - DMA ringbuffer and descriptor allocation/management - - Copyright (c) 2005 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); - } - } -} - -static inline -dma_addr_t map_descbuffer(struct bcm43xx_dmaring *ring, - unsigned char *buf, - size_t len, - int tx) -{ - dma_addr_t dmaaddr; - - if (tx) { - dmaaddr = dma_map_single(&ring->bcm->pci_dev->dev, - buf, len, - DMA_TO_DEVICE); - } else { - dmaaddr = dma_map_single(&ring->bcm->pci_dev->dev, - buf, len, - DMA_FROM_DEVICE); - } - - return dmaaddr; -} - -static inline -void unmap_descbuffer(struct bcm43xx_dmaring *ring, - dma_addr_t addr, - size_t len, - int tx) -{ - if (tx) { - dma_unmap_single(&ring->bcm->pci_dev->dev, - addr, len, - DMA_TO_DEVICE); - } else { - dma_unmap_single(&ring->bcm->pci_dev->dev, - addr, len, - DMA_FROM_DEVICE); - } -} - -static inline -void sync_descbuffer_for_cpu(struct bcm43xx_dmaring *ring, - dma_addr_t addr, - size_t len) -{ - assert(!ring->tx); - - dma_sync_single_for_cpu(&ring->bcm->pci_dev->dev, - addr, len, DMA_FROM_DEVICE); -} - -static inline -void sync_descbuffer_for_device(struct bcm43xx_dmaring *ring, - dma_addr_t addr, - size_t len) -{ - assert(!ring->tx); - - dma_sync_single_for_device(&ring->bcm->pci_dev->dev, - addr, len, DMA_FROM_DEVICE); -} - -/* Unmap and free a descriptor buffer. */ -static inline -void free_descriptor_buffer(struct bcm43xx_dmaring *ring, - struct bcm43xx_dmadesc *desc, - 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) -{ - struct device *dev = &(ring->bcm->pci_dev->dev); - - ring->vbase = dma_alloc_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, - &(ring->dmabase), GFP_KERNEL); - if (!ring->vbase) { - printk(KERN_ERR PFX "DMA ringmemory allocation failed\n"); - return -ENOMEM; - } - if (ring->dmabase + BCM43xx_DMA_RINGMEMSIZE > BCM43xx_DMA_BUSADDRMAX) { - printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA RINGMEMORY >1G " - "(0x%llx, len: %lu)\n", - (unsigned long long)ring->dmabase, - BCM43xx_DMA_RINGMEMSIZE); - dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, - ring->vbase, ring->dmabase); - return -ENOMEM; - } - assert(!(ring->dmabase & 0x000003FF)); - memset(ring->vbase, 0, BCM43xx_DMA_RINGMEMSIZE); - - return 0; -} - -static void free_ringmemory(struct bcm43xx_dmaring *ring) -{ - struct device *dev = &(ring->bcm->pci_dev->dev); - - dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, - ring->vbase, ring->dmabase); -} - -/* Reset the RX DMA channel */ -int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm, - u16 mmio_base) -{ - int i; - u32 value; - - bcm43xx_write32(bcm, - mmio_base + BCM43xx_DMA_RX_CONTROL, - 0x00000000); - for (i = 0; i < 1000; i++) { - value = bcm43xx_read32(bcm, - mmio_base + BCM43xx_DMA_RX_STATUS); - value &= BCM43xx_DMA_RXSTAT_STAT_MASK; - if (value == BCM43xx_DMA_RXSTAT_STAT_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 i; - u32 value; - - for (i = 0; i < 1000; i++) { - value = bcm43xx_read32(bcm, - mmio_base + BCM43xx_DMA_TX_STATUS); - value &= BCM43xx_DMA_TXSTAT_STAT_MASK; - if (value == BCM43xx_DMA_TXSTAT_STAT_DISABLED || - value == BCM43xx_DMA_TXSTAT_STAT_IDLEWAIT || - value == BCM43xx_DMA_TXSTAT_STAT_STOPPED) - break; - udelay(10); - } - bcm43xx_write32(bcm, - mmio_base + BCM43xx_DMA_TX_CONTROL, - 0x00000000); - for (i = 0; i < 1000; i++) { - value = bcm43xx_read32(bcm, - mmio_base + BCM43xx_DMA_TX_STATUS); - value &= BCM43xx_DMA_TXSTAT_STAT_MASK; - if (value == BCM43xx_DMA_TXSTAT_STAT_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 int setup_rx_descbuffer(struct bcm43xx_dmaring *ring, - struct bcm43xx_dmadesc *desc, - struct bcm43xx_dmadesc_meta *meta, - gfp_t gfp_flags) -{ - struct bcm43xx_rxhdr *rxhdr; - dma_addr_t dmaaddr; - u32 desc_addr; - u32 desc_ctl; - const int slot = (int)(desc - ring->vbase); - struct sk_buff *skb; - - assert(slot >= 0 && slot < ring->nr_slots); - 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); - if (unlikely(dmaaddr + ring->rx_buffersize > BCM43xx_DMA_BUSADDRMAX)) { - unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); - dev_kfree_skb_any(skb); - printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA RX SKB >1G " - "(0x%llx, len: %u)\n", - (unsigned long long)dmaaddr, ring->rx_buffersize); - return -ENOMEM; - } - meta->skb = skb; - meta->dmaaddr = dmaaddr; - skb->dev = ring->bcm->net_dev; - desc_addr = (u32)(dmaaddr + ring->memoffset); - desc_ctl = (BCM43xx_DMADTOR_BYTECNT_MASK & - (u32)(ring->rx_buffersize - ring->frameoffset)); - if (slot == ring->nr_slots - 1) - desc_ctl |= BCM43xx_DMADTOR_DTABLEEND; - set_desc_addr(desc, desc_addr); - set_desc_ctl(desc, desc_ctl); - - rxhdr = (struct bcm43xx_rxhdr *)(skb->data); - rxhdr->frame_length = 0; - rxhdr->flags1 = 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 *desc; - struct bcm43xx_dmadesc_meta *meta; - - for (i = 0; i < ring->nr_slots; i++) { - desc = ring->vbase + i; - meta = ring->meta + i; - - err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); - if (err) - goto err_unwind; - } - ring->used_slots = ring->nr_slots; - err = 0; -out: - return err; - -err_unwind: - for (i--; i >= 0; i--) { - desc = ring->vbase + i; - meta = ring->meta + i; - - 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; - - if (ring->tx) { - /* Set Transmit Control register to "transmit enable" */ - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, - BCM43xx_DMA_TXCTRL_ENABLE); - /* Set Transmit Descriptor ring address. */ - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_RING, - ring->dmabase + ring->memoffset); - } else { - err = alloc_initial_descbuffers(ring); - if (err) - goto out; - /* Set Receive Control "receive enable" and frame offset */ - value = (ring->frameoffset << BCM43xx_DMA_RXCTRL_FRAMEOFF_SHIFT); - value |= BCM43xx_DMA_RXCTRL_ENABLE; - bcm43xx_dma_write(ring, BCM43xx_DMA_RX_CONTROL, value); - /* Set Receive Descriptor ring address. */ - bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_RING, - ring->dmabase + ring->memoffset); - /* Init the descriptor pointer. */ - bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_INDEX, 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); - /* Zero out Transmit Descriptor ring address. */ - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_RING, 0); - } else { - bcm43xx_dmacontroller_rx_reset(ring->bcm, ring->mmio_base); - /* Zero out Receive Descriptor ring address. */ - bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_RING, 0); - } -} - -static void free_all_descbuffers(struct bcm43xx_dmaring *ring) -{ - struct bcm43xx_dmadesc *desc; - struct bcm43xx_dmadesc_meta *meta; - int i; - - if (!ring->used_slots) - return; - for (i = 0; i < ring->nr_slots; i++) { - desc = ring->vbase + i; - meta = ring->meta + i; - - 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, desc, meta, 0); - } -} - -/* Main initialization function. */ -static -struct bcm43xx_dmaring * bcm43xx_setup_dmaring(struct bcm43xx_private *bcm, - u16 dma_controller_base, - int nr_descriptor_slots, - int tx) -{ - struct bcm43xx_dmaring *ring; - int err; - - ring = kzalloc(sizeof(*ring), GFP_KERNEL); - if (!ring) - goto out; - - ring->meta = kzalloc(sizeof(*ring->meta) * nr_descriptor_slots, - GFP_KERNEL); - if (!ring->meta) - goto err_kfree_ring; - - ring->memoffset = BCM43xx_DMA_DMABUSADDROFFSET; -#ifdef CONFIG_BCM947XX - if (bcm->pci_dev->bus->number == 0) - ring->memoffset = 0; -#endif - - ring->bcm = bcm; - ring->nr_slots = nr_descriptor_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 = dma_controller_base; - if (tx) { - ring->tx = 1; - ring->current_slot = -1; - } else { - switch (dma_controller_base) { - case BCM43xx_MMIO_DMA1_BASE: - ring->rx_buffersize = BCM43xx_DMA1_RXBUFFERSIZE; - ring->frameoffset = BCM43xx_DMA1_RX_FRAMEOFFSET; - break; - case BCM43xx_MMIO_DMA4_BASE: - ring->rx_buffersize = BCM43xx_DMA4_RXBUFFERSIZE; - ring->frameoffset = BCM43xx_DMA4_RX_FRAMEOFFSET; - break; - default: - assert(0); - } - } - - err = alloc_ringmemory(ring); - if (err) - goto err_kfree_meta; - err = dmacontroller_setup(ring); - if (err) - goto err_free_ringmemory; - -out: - 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 0x%04x (%s) max used slots: %d/%d\n", - 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_ring1); - dma->rx_ring1 = NULL; - bcm43xx_destroy_dmaring(dma->rx_ring0); - dma->rx_ring0 = 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; - - /* setup TX DMA channels. */ - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA1_BASE, - BCM43xx_TXRING_SLOTS, 1); - if (!ring) - goto out; - dma->tx_ring0 = ring; - - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA2_BASE, - BCM43xx_TXRING_SLOTS, 1); - if (!ring) - goto err_destroy_tx0; - dma->tx_ring1 = ring; - - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA3_BASE, - BCM43xx_TXRING_SLOTS, 1); - if (!ring) - goto err_destroy_tx1; - dma->tx_ring2 = ring; - - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA4_BASE, - BCM43xx_TXRING_SLOTS, 1); - if (!ring) - goto err_destroy_tx2; - dma->tx_ring3 = ring; - - /* setup RX DMA channels. */ - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA1_BASE, - BCM43xx_RXRING_SLOTS, 0); - if (!ring) - goto err_destroy_tx3; - dma->rx_ring0 = ring; - - if (bcm->current_core->rev < 5) { - ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA4_BASE, - BCM43xx_RXRING_SLOTS, 0); - if (!ring) - goto err_destroy_rx0; - dma->rx_ring1 = ring; - } - - dprintk(KERN_INFO PFX "DMA initialized\n"); - err = 0; -out: - return err; - -err_destroy_rx0: - bcm43xx_destroy_dmaring(dma->rx_ring0); - dma->rx_ring0 = 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; - goto out; -} - -/* Generate a cookie for the TX header. */ -static u16 generate_cookie(struct bcm43xx_dmaring *ring, - int slot) -{ - u16 cookie = 0x0000; - - /* Use the upper 4 bits of the cookie as - * DMA controller ID and store the slot number - * in the lower 12 bits - */ - switch (ring->mmio_base) { - default: - assert(0); - case BCM43xx_MMIO_DMA1_BASE: - break; - case BCM43xx_MMIO_DMA2_BASE: - cookie = 0x1000; - break; - case BCM43xx_MMIO_DMA3_BASE: - cookie = 0x2000; - break; - case BCM43xx_MMIO_DMA4_BASE: - cookie = 0x3000; - 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 0x0000: - ring = dma->tx_ring0; - break; - case 0x1000: - ring = dma->tx_ring1; - break; - case 0x2000: - ring = dma->tx_ring2; - break; - case 0x3000: - ring = dma->tx_ring3; - 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) -{ - /* 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); - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_INDEX, - (u32)(slot * sizeof(struct bcm43xx_dmadesc))); -} - -static int dma_tx_fragment(struct bcm43xx_dmaring *ring, - struct sk_buff *skb, - u8 cur_frag) -{ - int slot; - struct bcm43xx_dmadesc *desc; - struct bcm43xx_dmadesc_meta *meta; - u32 desc_ctl; - u32 desc_addr; - - assert(skb_shinfo(skb)->nr_frags == 0); - - slot = request_slot(ring); - desc = ring->vbase + slot; - meta = ring->meta + slot; - - /* 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)); - - meta->skb = skb; - meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); - if (unlikely(meta->dmaaddr + skb->len > BCM43xx_DMA_BUSADDRMAX)) { - return_slot(ring, slot); - printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA TX SKB >1G " - "(0x%llx, len: %u)\n", - (unsigned long long)meta->dmaaddr, skb->len); - return -ENOMEM; - } - - desc_addr = (u32)(meta->dmaaddr + ring->memoffset); - desc_ctl = BCM43xx_DMADTOR_FRAMESTART | BCM43xx_DMADTOR_FRAMEEND; - desc_ctl |= BCM43xx_DMADTOR_COMPIRQ; - desc_ctl |= (BCM43xx_DMADTOR_BYTECNT_MASK & - (u32)(meta->skb->len - ring->frameoffset)); - if (slot == ring->nr_slots - 1) - desc_ctl |= BCM43xx_DMADTOR_DTABLEEND; - - set_desc_ctl(desc, desc_ctl); - set_desc_addr(desc, desc_addr); - /* Now transfer the whole frame. */ - dmacontroller_poke_tx(ring, slot); - - return 0; -} - -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); - //TODO: handle failure of dma_tx_fragment - } - 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 *desc; - struct bcm43xx_dmadesc_meta *meta; - int is_last_fragment; - int slot; - - ring = parse_cookie(bcm, status->cookie, &slot); - assert(ring); - assert(ring->tx); - assert(get_desc_ctl(ring->vbase + slot) & BCM43xx_DMADTOR_FRAMESTART); - while (1) { - assert(slot >= 0 && slot < ring->nr_slots); - desc = ring->vbase + slot; - meta = ring->meta + slot; - - is_last_fragment = !!(get_desc_ctl(desc) & BCM43xx_DMADTOR_FRAMEEND); - unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); - free_descriptor_buffer(ring, desc, 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 *desc; - struct bcm43xx_dmadesc_meta *meta; - struct bcm43xx_rxhdr *rxhdr; - struct sk_buff *skb; - u16 len; - int err; - dma_addr_t dmaaddr; - - desc = ring->vbase + *slot; - meta = ring->meta + *slot; - - sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); - skb = meta->skb; - - if (ring->mmio_base == BCM43xx_MMIO_DMA4_BASE) { - /* We received an xmit status. */ - struct bcm43xx_hwxmitstatus *hw = (struct bcm43xx_hwxmitstatus *)skb->data; - struct bcm43xx_xmitstatus stat; - - 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 = ring->vbase + *slot; - meta = ring->meta + *slot; - /* 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); - status = bcm43xx_dma_read(ring, BCM43xx_DMA_RX_STATUS); - descptr = (status & BCM43xx_DMA_RXSTAT_DPTR_MASK); - current_slot = descptr / sizeof(struct bcm43xx_dmadesc); - 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 - } - bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_INDEX, - (u32)(slot * sizeof(struct bcm43xx_dmadesc))); - 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); - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, - bcm43xx_dma_read(ring, BCM43xx_DMA_TX_CONTROL) - | BCM43xx_DMA_TXCTRL_SUSPEND); -} - -void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring) -{ - assert(ring->tx); - bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, - bcm43xx_dma_read(ring, BCM43xx_DMA_TX_CONTROL) - & ~BCM43xx_DMA_TXCTRL_SUSPEND); - bcm43xx_power_saving_ctl_bits(ring->bcm, -1, -1); -} |