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path: root/drivers/net/ethoc.c
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Diffstat (limited to 'drivers/net/ethoc.c')
-rw-r--r--drivers/net/ethoc.c83
1 files changed, 56 insertions, 27 deletions
diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index b7311bc0025..9c950bb5e90 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -17,8 +17,13 @@
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
+#include <linux/sched.h>
#include <net/ethoc.h>
+static int buffer_size = 0x8000; /* 32 KBytes */
+module_param(buffer_size, int, 0);
+MODULE_PARM_DESC(buffer_size, "DMA buffer allocation size");
+
/* register offsets */
#define MODER 0x00
#define INT_SOURCE 0x04
@@ -167,6 +172,7 @@
* struct ethoc - driver-private device structure
* @iobase: pointer to I/O memory region
* @membase: pointer to buffer memory region
+ * @dma_alloc: dma allocated buffer size
* @num_tx: number of send buffers
* @cur_tx: last send buffer written
* @dty_tx: last buffer actually sent
@@ -185,6 +191,7 @@
struct ethoc {
void __iomem *iobase;
void __iomem *membase;
+ int dma_alloc;
unsigned int num_tx;
unsigned int cur_tx;
@@ -284,7 +291,7 @@ static int ethoc_init_ring(struct ethoc *dev)
dev->cur_rx = 0;
/* setup transmission buffers */
- bd.addr = 0;
+ bd.addr = virt_to_phys(dev->membase);
bd.stat = TX_BD_IRQ | TX_BD_CRC;
for (i = 0; i < dev->num_tx; i++) {
@@ -295,7 +302,6 @@ static int ethoc_init_ring(struct ethoc *dev)
bd.addr += ETHOC_BUFSIZ;
}
- bd.addr = dev->num_tx * ETHOC_BUFSIZ;
bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
for (i = 0; i < dev->num_rx; i++) {
@@ -400,8 +406,12 @@ static int ethoc_rx(struct net_device *dev, int limit)
if (ethoc_update_rx_stats(priv, &bd) == 0) {
int size = bd.stat >> 16;
struct sk_buff *skb = netdev_alloc_skb(dev, size);
+
+ size -= 4; /* strip the CRC */
+ skb_reserve(skb, 2); /* align TCP/IP header */
+
if (likely(skb)) {
- void *src = priv->membase + bd.addr;
+ void *src = phys_to_virt(bd.addr);
memcpy_fromio(skb_put(skb, size), src, size);
skb->protocol = eth_type_trans(skb, dev);
priv->stats.rx_packets++;
@@ -653,9 +663,10 @@ static int ethoc_open(struct net_device *dev)
if (ret)
return ret;
- /* calculate the number of TX/RX buffers */
- num_bd = (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ;
- priv->num_tx = min(min_tx, num_bd / 4);
+ /* calculate the number of TX/RX buffers, maximum 128 supported */
+ num_bd = min_t(unsigned int,
+ 128, (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ);
+ priv->num_tx = max(min_tx, num_bd / 4);
priv->num_rx = num_bd - priv->num_tx;
ethoc_write(priv, TX_BD_NUM, priv->num_tx);
@@ -823,7 +834,7 @@ static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
else
bd.stat &= ~TX_BD_PAD;
- dest = priv->membase + bd.addr;
+ dest = phys_to_virt(bd.addr);
memcpy_toio(dest, skb->data, skb->len);
bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
@@ -903,22 +914,19 @@ static int ethoc_probe(struct platform_device *pdev)
/* obtain buffer memory space */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!res) {
- dev_err(&pdev->dev, "cannot obtain memory space\n");
- ret = -ENXIO;
- goto free;
- }
-
- mem = devm_request_mem_region(&pdev->dev, res->start,
+ if (res) {
+ mem = devm_request_mem_region(&pdev->dev, res->start,
res->end - res->start + 1, res->name);
- if (!mem) {
- dev_err(&pdev->dev, "cannot request memory space\n");
- ret = -ENXIO;
- goto free;
+ if (!mem) {
+ dev_err(&pdev->dev, "cannot request memory space\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ netdev->mem_start = mem->start;
+ netdev->mem_end = mem->end;
}
- netdev->mem_start = mem->start;
- netdev->mem_end = mem->end;
/* obtain device IRQ number */
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -933,6 +941,7 @@ static int ethoc_probe(struct platform_device *pdev)
/* setup driver-private data */
priv = netdev_priv(netdev);
priv->netdev = netdev;
+ priv->dma_alloc = 0;
priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
mmio->end - mmio->start + 1);
@@ -942,12 +951,27 @@ static int ethoc_probe(struct platform_device *pdev)
goto error;
}
- priv->membase = devm_ioremap_nocache(&pdev->dev, netdev->mem_start,
- mem->end - mem->start + 1);
- if (!priv->membase) {
- dev_err(&pdev->dev, "cannot remap memory space\n");
- ret = -ENXIO;
- goto error;
+ if (netdev->mem_end) {
+ priv->membase = devm_ioremap_nocache(&pdev->dev,
+ netdev->mem_start, mem->end - mem->start + 1);
+ if (!priv->membase) {
+ dev_err(&pdev->dev, "cannot remap memory space\n");
+ ret = -ENXIO;
+ goto error;
+ }
+ } else {
+ /* Allocate buffer memory */
+ priv->membase = dma_alloc_coherent(NULL,
+ buffer_size, (void *)&netdev->mem_start,
+ GFP_KERNEL);
+ if (!priv->membase) {
+ dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
+ buffer_size);
+ ret = -ENOMEM;
+ goto error;
+ }
+ netdev->mem_end = netdev->mem_start + buffer_size;
+ priv->dma_alloc = buffer_size;
}
/* Allow the platform setup code to pass in a MAC address. */
@@ -1034,6 +1058,9 @@ free_mdio:
kfree(priv->mdio->irq);
mdiobus_free(priv->mdio);
free:
+ if (priv->dma_alloc)
+ dma_free_coherent(NULL, priv->dma_alloc, priv->membase,
+ netdev->mem_start);
free_netdev(netdev);
out:
return ret;
@@ -1059,7 +1086,9 @@ static int ethoc_remove(struct platform_device *pdev)
kfree(priv->mdio->irq);
mdiobus_free(priv->mdio);
}
-
+ if (priv->dma_alloc)
+ dma_free_coherent(NULL, priv->dma_alloc, priv->membase,
+ netdev->mem_start);
unregister_netdev(netdev);
free_netdev(netdev);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 14:19:36 +0000