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linux-sg2042
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ethoc: use system memory as buffer 

This patch enabled the ethoc to allocate system memory as buffer
when there is no dedicated buffer memory.

Some hardware designs may not have dedicated buffer memory such as
on chip or off chip SRAM. In this case, only one memory resource is
supplied in the platform data instead of two. Then a DMA buffer can
be allocated from system memory and used for the transfer.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Chou 2009-10-04 23:33:20 +00:00 committed by David S. Miller
parent 050f91dcd9
commit 0baa080c75
1 changed files with 44 additions and 20 deletions
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64
drivers/net/ethoc.c
View File

@ -19,6 +19,10 @@
#include <linux/platform_device.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 +171,7 @@
* 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 +190,7 @@
struct ethoc {
void __iomem *iobase;
void __iomem *membase;
int dma_alloc;
unsigned int num_tx;
unsigned int cur_tx;
@ -906,22 +912,19 @@ 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);
@ -936,6 +939,7 @@ 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);
@ -945,12 +949,27 @@ 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. */
@ -1037,6 +1056,9 @@ 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;
@ -1062,7 +1084,9 @@ 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);
}