linux-sg2042/drivers/net/mipsnet.c

305 lines
7.2 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define DEBUG
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <asm/mips-boards/simint.h>
#include "mipsnet.h" /* actual device IO mapping */
#define MIPSNET_VERSION "2005-06-20"
#define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field))
static char mipsnet_string[] = "mipsnet";
/*
* Copy data from the MIPSNET rx data port
*/
static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata,
int len)
{
uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount));
if (available_len < len)
return -EFAULT;
for (; len > 0; len--, kdata++)
*kdata = inb(mipsnet_reg_address(dev, rxDataBuffer));
return inl(mipsnet_reg_address(dev, rxDataCount));
}
static inline ssize_t mipsnet_put_todevice(struct net_device *dev,
struct sk_buff *skb)
{
int count_to_go = skb->len;
char *buf_ptr = skb->data;
pr_debug("%s: %s(): telling MIPSNET txDataCount(%d)\n",
dev->name, __FUNCTION__, skb->len);
outl(skb->len, mipsnet_reg_address(dev, txDataCount));
pr_debug("%s: %s(): sending data to MIPSNET txDataBuffer(%d)\n",
dev->name, __FUNCTION__, skb->len);
for (; count_to_go; buf_ptr++, count_to_go--)
outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer));
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return skb->len;
}
static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev)
{
pr_debug("%s:%s(): transmitting %d bytes\n",
dev->name, __FUNCTION__, skb->len);
/* Only one packet at a time. Once TXDONE interrupt is serviced, the
* queue will be restarted.
*/
netif_stop_queue(dev);
mipsnet_put_todevice(dev, skb);
return 0;
}
static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count)
{
struct sk_buff *skb;
size_t len = count;
skb = alloc_skb(len + 2, GFP_KERNEL);
if (!skb) {
dev->stats.rx_dropped++;
return -ENOMEM;
}
skb_reserve(skb, 2);
if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len))
return -EFAULT;
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
pr_debug("%s:%s(): pushing RXed data to kernel\n",
dev->name, __FUNCTION__);
netif_rx(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
return count;
}
static irqreturn_t mipsnet_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
irqreturn_t retval = IRQ_NONE;
uint64_t interruptFlags;
if (irq == dev->irq) {
pr_debug("%s:%s(): irq %d for device\n",
dev->name, __FUNCTION__, irq);
retval = IRQ_HANDLED;
interruptFlags =
inl(mipsnet_reg_address(dev, interruptControl));
pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name,
__FUNCTION__, interruptFlags);
if (interruptFlags & MIPSNET_INTCTL_TXDONE) {
pr_debug("%s:%s(): got TXDone\n",
dev->name, __FUNCTION__);
outl(MIPSNET_INTCTL_TXDONE,
mipsnet_reg_address(dev, interruptControl));
/* only one packet at a time, we are done. */
netif_wake_queue(dev);
} else if (interruptFlags & MIPSNET_INTCTL_RXDONE) {
pr_debug("%s:%s(): got RX data\n",
dev->name, __FUNCTION__);
mipsnet_get_fromdev(dev,
inl(mipsnet_reg_address(dev, rxDataCount)));
pr_debug("%s:%s(): clearing RX int\n",
dev->name, __FUNCTION__);
outl(MIPSNET_INTCTL_RXDONE,
mipsnet_reg_address(dev, interruptControl));
} else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) {
pr_debug("%s:%s(): got test interrupt\n",
dev->name, __FUNCTION__);
/*
* TESTBIT is cleared on read.
* And takes effect after a write with 0
*/
outl(0, mipsnet_reg_address(dev, interruptControl));
} else {
pr_debug("%s:%s(): no valid fags 0x%016llx\n",
dev->name, __FUNCTION__, interruptFlags);
/* Maybe shared IRQ, just ignore, no clearing. */
retval = IRQ_NONE;
}
} else {
printk(KERN_INFO "%s: %s(): irq %d for unknown device\n",
dev->name, __FUNCTION__, irq);
retval = IRQ_NONE;
}
return retval;
}
static int mipsnet_open(struct net_device *dev)
{
int err;
pr_debug("%s: mipsnet_open\n", dev->name);
err = request_irq(dev->irq, &mipsnet_interrupt,
IRQF_SHARED, dev->name, (void *) dev);
if (err) {
pr_debug("%s: %s(): can't get irq %d\n",
dev->name, __FUNCTION__, dev->irq);
release_region(dev->base_addr, MIPSNET_IO_EXTENT);
return err;
}
pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n",
dev->name, __FUNCTION__, dev->base_addr, dev->irq);
netif_start_queue(dev);
/* test interrupt handler */
outl(MIPSNET_INTCTL_TESTBIT,
mipsnet_reg_address(dev, interruptControl));
return 0;
}
static int mipsnet_close(struct net_device *dev)
{
pr_debug("%s: %s()\n", dev->name, __FUNCTION__);
netif_stop_queue(dev);
return 0;
}
static void mipsnet_set_mclist(struct net_device *dev)
{
}
static int __init mipsnet_probe(struct device *dev)
{
struct net_device *netdev;
int err;
netdev = alloc_etherdev(0);
if (!netdev) {
err = -ENOMEM;
goto out;
}
dev_set_drvdata(dev, netdev);
netdev->open = mipsnet_open;
netdev->stop = mipsnet_close;
netdev->hard_start_xmit = mipsnet_xmit;
netdev->set_multicast_list = mipsnet_set_mclist;
/*
* TODO: probe for these or load them from PARAM
*/
netdev->base_addr = 0x4200;
netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 +
inl(mipsnet_reg_address(netdev, interruptInfo));
/* Get the io region now, get irq on open() */
if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) {
pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} "
"for dev is not availble.\n", netdev->name,
__FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT);
err = -EBUSY;
goto out_free_netdev;
}
/*
* Lacking any better mechanism to allocate a MAC address we use a
* random one ...
*/
random_ether_addr(netdev->dev_addr);
err = register_netdev(netdev);
if (err) {
printk(KERN_ERR "MIPSNet: failed to register netdev.\n");
goto out_free_region;
}
return 0;
out_free_region:
release_region(netdev->base_addr, MIPSNET_IO_EXTENT);
out_free_netdev:
free_netdev(netdev);
out:
return err;
}
static int __devexit mipsnet_device_remove(struct device *device)
{
struct net_device *dev = dev_get_drvdata(device);
unregister_netdev(dev);
release_region(dev->base_addr, MIPSNET_IO_EXTENT);
free_netdev(dev);
dev_set_drvdata(device, NULL);
return 0;
}
static struct device_driver mipsnet_driver = {
.name = mipsnet_string,
.bus = &platform_bus_type,
.probe = mipsnet_probe,
.remove = __devexit_p(mipsnet_device_remove),
};
static int __init mipsnet_init_module(void)
{
int err;
printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. "
"(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION);
err = driver_register(&mipsnet_driver);
if (err)
printk(KERN_ERR "Driver registration failed\n");
return err;
}
static void __exit mipsnet_exit_module(void)
{
pr_debug("MIPSNet Ethernet driver exiting\n");
driver_unregister(&mipsnet_driver);
}
module_init(mipsnet_init_module);
module_exit(mipsnet_exit_module);