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linux-sg2042
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solos: Tidy up DMA handling a little. Still untested 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-01-29 10:51:11 +11:00
parent 909372317e
commit eaf83e3935
1 changed files with 52 additions and 41 deletions
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93
drivers/atm/solos-pci.c
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@ -68,6 +68,8 @@
#define RX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2)
#define TX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2 + BUF_SIZE)
#define RX_DMA_SIZE 2048
static int debug = 0;
static int atmdebug = 0;
static int firmware_upgrade = 0;
@ -608,17 +610,11 @@ void solos_bh(unsigned long card_arg)
if (card->using_dma) {
skb = card->rx_skb[port];
pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr, skb->len,
PCI_DMA_FROMDEVICE);
card->rx_skb[port] = NULL;
pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr,
RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
card->rx_skb[port] = alloc_skb(2048, GFP_ATOMIC);
if (card->rx_skb[port]) {
SKB_CB(card->rx_skb[port])->dma_addr =
pci_map_single(card->dev, skb->data, skb->len,
PCI_DMA_FROMDEVICE);
iowrite32(SKB_CB(card->rx_skb[port])->dma_addr,
card->config_regs + RX_DMA_ADDR(port));
}
header = (void *)skb->data;
size = le16_to_cpu(header->size);
skb_put(skb, size + sizeof(*header));
@ -669,7 +665,7 @@ void solos_bh(unsigned long card_arg)
case PKT_STATUS:
process_status(card, port, skb);
dev_kfree_skb(skb);
dev_kfree_skb_any(skb);
break;
case PKT_COMMAND:
@ -681,12 +677,32 @@ void solos_bh(unsigned long card_arg)
if (net_ratelimit())
dev_warn(&card->dev->dev, "Dropping console response on port %d\n",
port);
dev_kfree_skb_any(skb);
} else
skb_queue_tail(&card->cli_queue[port], skb);
spin_unlock(&card->cli_queue_lock);
break;
}
}
/* Allocate RX skbs for any ports which need them */
if (card->using_dma && card->atmdev[port] &&
!card->rx_skb[port]) {
struct sk_buff *skb = alloc_skb(RX_DMA_SIZE, GFP_ATOMIC);
if (skb) {
SKB_CB(skb)->dma_addr =
pci_map_single(card->dev, skb->data,
RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
iowrite32(SKB_CB(skb)->dma_addr,
card->config_regs + RX_DMA_ADDR(port));
card->rx_skb[port] = skb;
} else {
if (net_ratelimit())
dev_warn(&card->dev->dev, "Failed to allocate RX skb");
/* We'll have to try again later */
tasklet_schedule(&card->tlet);
}
}
}
if (rx_done)
iowrite32(rx_done, card->config_regs + FLAGS_ADDR);
@ -901,50 +917,45 @@ static int fpga_tx(struct solos_card *card)
for (port = 0; port < card->nr_ports; port++) {
if (card->atmdev[port] && !(tx_pending & (1 << port))) {
struct sk_buff *oldskb = card->tx_skb[port];
if (oldskb)
pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
oldskb->len, PCI_DMA_TODEVICE);
spin_lock(&card->tx_queue_lock);
skb = skb_dequeue(&card->tx_queue[port]);
spin_unlock(&card->tx_queue_lock);
if (!skb)
if (skb && !card->using_dma) {
memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
tx_started |= 1 << port; //Set TX full flag
oldskb = skb; /* We're done with this skb already */
} else if (skb && card->using_dma) {
SKB_CB(skb)->dma_addr = pci_map_single(card->dev, skb->data,
skb->len, PCI_DMA_TODEVICE);
iowrite32(SKB_CB(skb)->dma_addr,
card->config_regs + TX_DMA_ADDR(port));
}
if (!oldskb)
continue;
/* Clean up and free oldskb now it's gone */
if (atmdebug) {
dev_info(&card->dev->dev, "Transmitted: port %d\n",
port);
print_buffer(skb);
print_buffer(oldskb);
}
if (card->using_dma) {
if (card->tx_skb[port]) {
struct sk_buff *oldskb = card->tx_skb[port];
pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
oldskb->len, PCI_DMA_TODEVICE);
vcc = SKB_CB(oldskb)->vcc;
vcc = SKB_CB(oldskb)->vcc;
if (vcc) {
atomic_inc(&vcc->stats->tx);
solos_pop(vcc, oldskb);
} else
dev_kfree_skb_irq(oldskb);
if (vcc) {
atomic_inc(&vcc->stats->tx);
solos_pop(vcc, oldskb);
} else
dev_kfree_skb_irq(oldskb);
}
SKB_CB(skb)->dma_addr = pci_map_single(card->dev, skb->data,
skb->len, PCI_DMA_TODEVICE);
iowrite32(SKB_CB(skb)->dma_addr, card->config_regs + TX_DMA_ADDR(port));
} else {
memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
tx_started |= 1 << port; //Set TX full flag
vcc = SKB_CB(skb)->vcc;
if (vcc) {
atomic_inc(&vcc->stats->tx);
solos_pop(vcc, skb);
} else
dev_kfree_skb_irq(skb);
}
}
}
if (tx_started)