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r6040: add helpers to allocate and free the Tx/Rx buffers
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r6040_init_ring_desc moves around but it is kept unchanged.

Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
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Florian Fainelli authored and Francois Romieu committed Feb 5, 2008
1 parent d248fd7 commit b4f1255
Showing 1 changed file with 84 additions and 60 deletions.
144 changes: 84 additions & 60 deletions drivers/net/r6040.c
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,38 @@ static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
phy_write(ioaddr, lp->phy_addr, reg, val);
}

static void r6040_free_txbufs(struct net_device *dev)
{
struct r6040_private *lp = netdev_priv(dev);
int i;

for (i = 0; i < TX_DCNT; i++) {
if (lp->tx_insert_ptr->skb_ptr) {
pci_unmap_single(lp->pdev, lp->tx_insert_ptr->buf,
MAX_BUF_SIZE, PCI_DMA_TODEVICE);
dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
lp->rx_insert_ptr->skb_ptr = NULL;
}
lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
}
}

static void r6040_free_rxbufs(struct net_device *dev)
{
struct r6040_private *lp = netdev_priv(dev);
int i;

for (i = 0; i < RX_DCNT; i++) {
if (lp->rx_insert_ptr->skb_ptr) {
pci_unmap_single(lp->pdev, lp->rx_insert_ptr->buf,
MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
lp->rx_insert_ptr->skb_ptr = NULL;
}
lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
}
}

static void r6040_tx_timeout(struct net_device *dev)
{
struct r6040_private *priv = netdev_priv(dev);
Expand All @@ -247,6 +279,23 @@ static void r6040_tx_timeout(struct net_device *dev)
netif_stop_queue(dev);
}

static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
dma_addr_t desc_dma, int size)
{
struct r6040_descriptor *desc = desc_ring;
dma_addr_t mapping = desc_dma;

while (size-- > 0) {
mapping += sizeof(sizeof(*desc));
desc->ndesc = cpu_to_le32(mapping);
desc->vndescp = desc + 1;
desc++;
}
desc--;
desc->ndesc = cpu_to_le32(desc_dma);
desc->vndescp = desc_ring;
}

/* Allocate skb buffer for rx descriptor */
static void rx_buf_alloc(struct r6040_private *lp, struct net_device *dev)
{
Expand All @@ -271,6 +320,35 @@ static void rx_buf_alloc(struct r6040_private *lp, struct net_device *dev)
lp->rx_insert_ptr = descptr;
}

static void r6040_alloc_txbufs(struct net_device *dev)
{
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;

lp->tx_free_desc = TX_DCNT;

lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);

iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);
}

static void r6040_alloc_rxbufs(struct net_device *dev)
{
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;

lp->rx_free_desc = 0;

lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);

rx_buf_alloc(lp, dev);

iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);
}

static struct net_device_stats *r6040_get_stats(struct net_device *dev)
{
Expand All @@ -292,7 +370,6 @@ static void r6040_down(struct net_device *dev)
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;
struct pci_dev *pdev = lp->pdev;
int i;
int limit = 2048;
u16 *adrp;
u16 cmd;
Expand All @@ -312,27 +389,12 @@ static void r6040_down(struct net_device *dev)
iowrite16(adrp[1], ioaddr + MID_0M);
iowrite16(adrp[2], ioaddr + MID_0H);
free_irq(dev->irq, dev);

/* Free RX buffer */
for (i = 0; i < RX_DCNT; i++) {
if (lp->rx_insert_ptr->skb_ptr) {
pci_unmap_single(lp->pdev, lp->rx_insert_ptr->buf,
MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
lp->rx_insert_ptr->skb_ptr = NULL;
}
lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
}
r6040_free_rxbufs(dev);

/* Free TX buffer */
for (i = 0; i < TX_DCNT; i++) {
if (lp->tx_insert_ptr->skb_ptr) {
pci_unmap_single(lp->pdev, lp->tx_insert_ptr->buf,
MAX_BUF_SIZE, PCI_DMA_TODEVICE);
dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
lp->rx_insert_ptr->skb_ptr = NULL;
}
lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
}
r6040_free_txbufs(dev);

/* Free Descriptor memory */
pci_free_consistent(pdev, RX_DESC_SIZE, lp->rx_ring, lp->rx_ring_dma);
Expand Down Expand Up @@ -583,53 +645,15 @@ static void r6040_poll_controller(struct net_device *dev)
}
#endif

static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
dma_addr_t desc_dma, int size)
{
struct r6040_descriptor *desc = desc_ring;
dma_addr_t mapping = desc_dma;

while (size-- > 0) {
mapping += sizeof(sizeof(*desc));
desc->ndesc = cpu_to_le32(mapping);
desc->vndescp = desc + 1;
desc++;
}
desc--;
desc->ndesc = cpu_to_le32(desc_dma);
desc->vndescp = desc_ring;
}

/* Init RDC MAC */
static void r6040_up(struct net_device *dev)
{
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;

/* Initialize */
lp->tx_free_desc = TX_DCNT;
lp->rx_free_desc = 0;
/* Init descriptor */
lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
/* Init TX descriptor */
r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);

/* Init RX descriptor */
r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);

/* Allocate buffer for RX descriptor */
rx_buf_alloc(lp, dev);

/*
* TX and RX descriptor start registers.
* Lower 16-bits to MxD_SA0. Higher 16-bits to MxD_SA1.
*/
iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);

iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);
/* Initialise and alloc RX/TX buffers */
r6040_alloc_txbufs(dev);
r6040_alloc_rxbufs(dev);

/* Buffer Size Register */
iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);
Expand Down

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