/* The typical workload of the driver:
Handle the network interface interrupts. */
static irqreturn_t net_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct net_local *lp;
int ioaddr, status;
if (dev == NULL) {
printk ("net_interrupt(): irq %d for unknown device.\n", irq);
return IRQ_NONE;
}
ioaddr = dev->base_addr;
lp = netdev_priv(dev);
/* we MUST read all the events out of the ISQ, otherwise we'll never
get interrupted again. As a consequence, we can't have any limit
on the number of times we loop in the interrupt handler. The
hardware guarantees that eventually we'll run out of events. Of
course, if you're on a slow machine, and packets are arriving
faster than you can read them off, you're screwed. Hasta la
vista, baby! */
while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
if (net_debug > 4)printk("%s: event=%04x\n", dev->name, status);
switch(status & ISQ_EVENT_MASK) {
case ISQ_RECEIVER_EVENT:
/* Got a packet(s). */
net_rx(dev);
break;
case ISQ_TRANSMITTER_EVENT:
lp->stats.tx_packets++;
netif_wake_queue(dev);
if ((status & TX_OK) == 0) lp->stats.tx_errors++;
if (status & TX_LOST_CRS) lp->stats.tx_carrier_errors++;
if (status & TX_SQE_ERROR) lp->stats.tx_heartbeat_errors++;
if (status & TX_LATE_COL) lp->stats.tx_window_errors++;
if (status & TX_16_COL) lp->stats.tx_aborted_errors++;
break;
case ISQ_BUFFER_EVENT:
if (status & READY_FOR_TX) {
/* we tried to transmit a packet earlier,
but inexplicably ran out of buffers.
That shouldn't happen since we only ever
load one packet. Shrug. Do the right
thing anyway. */
netif_wake_queue(dev);
}
if (status & TX_UNDERRUN) {
if (net_debug > 0) printk("%s: transmit underrun\n", dev->name);
lp->send_underrun++;
if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
}
break;
case ISQ_RX_MISS_EVENT:
lp->stats.rx_missed_errors += (status >>6);
break;
case ISQ_TX_COL_EVENT:
lp->stats.collisions += (status >>6);
break;
}
}
return IRQ_HANDLED;
}
/* Probe for the CS8900 card in slot E. We won't bother looking
anywhere else until we have a really good reason to do so. */
struct net_device * __init mac89x0_probe(int unit)
{
struct net_device *dev;
static int once_is_enough;
struct net_local *lp;
static unsigned version_printed;
int i, slot;
unsigned rev_type = 0;
unsigned long ioaddr;
unsigned short sig;
int err = -ENODEV;
if (!MACH_IS_MAC)
return ERR_PTR(-ENODEV);
dev = alloc_etherdev(sizeof(struct net_local));
if (!dev)
return ERR_PTR(-ENOMEM);
if (unit >= 0) {
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
}
if (once_is_enough)
goto out;
once_is_enough = 1;
/* We might have to parameterize this later */
slot = 0xE;
/* Get out now if there's a real NuBus card in slot E */
if (nubus_find_slot(slot, NULL) != NULL)
goto out;
/* The pseudo-ISA bits always live at offset 0x300 (gee,
wonder why...) */
ioaddr = (unsigned long)
nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
{
unsigned long flags;
int card_present;
local_irq_save(flags);
card_present = (hwreg_present((void*) ioaddr+4) &&
hwreg_present((void*) ioaddr + DATA_PORT));
local_irq_restore(flags);
if (!card_present)
goto out;
}
nubus_writew(0, ioaddr + ADD_PORT);
sig = nubus_readw(ioaddr + DATA_PORT);
if (sig != swab16(CHIP_EISA_ID_SIG))
goto out;
/* Initialize the net_device structure. */
lp = netdev_priv(dev);
/* Fill in the 'dev' fields. */
dev->base_addr = ioaddr;
dev->mem_start = (unsigned long)
nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
dev->mem_end = dev->mem_start + 0x1000;
/* Turn on shared memory */
writereg_io(dev, PP_BusCTL, MEMORY_ON);
/* get the chip type */
rev_type = readreg(dev, PRODUCT_ID_ADD);
lp->chip_type = rev_type &~ REVISON_BITS;
lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
/* Check the chip type and revision in order to set the correct send command
CS8920 revision C and CS8900 revision F can use the faster send. */
lp->send_cmd = TX_AFTER_381;
if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
lp->send_cmd = TX_NOW;
if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
lp->send_cmd = TX_NOW;
if (net_debug && version_printed++ == 0)
printk(version);
printk(KERN_INFO "%s: cs89%c0%s rev %c found at %#8lx",
dev->name,
lp->chip_type==CS8900?'0':'2',
lp->chip_type==CS8920M?"M":"",
lp->chip_revision,
dev->base_addr);
/* Try to read the MAC address */
if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
printk("\nmac89x0: No EEPROM, giving up now.\n");
goto out1;
} else {
for (i = 0; i < ETH_ALEN; i += 2) {
/* Big-endian (why??!) */
unsigned short s = readreg(dev, PP_IA + i);
dev->dev_addr[i] = s >> 8;
dev->dev_addr[i+1] = s & 0xff;
}
}
dev->irq = SLOT2IRQ(slot);
/* print the IRQ and ethernet address. */
printk(" IRQ %d ADDR %pM\n", dev->irq, dev->dev_addr);
dev->netdev_ops = &mac89x0_netdev_ops;
err = register_netdev(dev);
if (err)
goto out1;
return NULL;
out1:
nubus_writew(0, dev->base_addr + ADD_PORT);
out:
free_netdev(dev);
return ERR_PTR(err);
}
/* For reading/writing registers ISA-style */
static inline int
readreg_io(struct net_device *dev, int portno)
{
nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
return swab16(nubus_readw(dev->base_addr + DATA_PORT));
}
/* These are for reading/writing registers in shared memory */
static inline int
readreg(struct net_device *dev, int portno)
{
return swab16(nubus_readw(dev->mem_start + portno));
}
/* Probe for the CS8900 card in slot E. We won't bother looking
anywhere else until we have a really good reason to do so. */
int __init mac89x0_probe(struct net_device *dev)
{
static int once_is_enough;
struct net_local *lp;
static unsigned version_printed;
int i, slot;
unsigned rev_type = 0;
unsigned long ioaddr;
unsigned short sig;
SET_MODULE_OWNER(dev);
if (once_is_enough)
return -ENODEV;
once_is_enough = 1;
/* We might have to parameterize this later */
slot = 0xE;
/* Get out now if there's a real NuBus card in slot E */
if (nubus_find_slot(slot, NULL) != NULL)
return -ENODEV;
/* The pseudo-ISA bits always live at offset 0x300 (gee,
wonder why...) */
ioaddr = (unsigned long)
nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
{
unsigned long flags;
int card_present;
local_irq_save(flags);
card_present = hwreg_present((void*) ioaddr+4)
&& hwreg_present((void*) ioaddr + DATA_PORT);
local_irq_restore(flags);
if (!card_present)
return -ENODEV;
}
nubus_writew(0, ioaddr + ADD_PORT);
sig = nubus_readw(ioaddr + DATA_PORT);
if (sig != swab16(CHIP_EISA_ID_SIG))
return -ENODEV;
/* Initialize the net_device structure. */
if (dev->priv == NULL) {
dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
if (!dev->priv)
return -ENOMEM;
memset(dev->priv, 0, sizeof(struct net_local));
}
lp = (struct net_local *)dev->priv;
/* Fill in the 'dev' fields. */
dev->base_addr = ioaddr;
dev->mem_start = (unsigned long)
nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
dev->mem_end = dev->mem_start + 0x1000;
/* Turn on shared memory */
writereg_io(dev, PP_BusCTL, MEMORY_ON);
/* get the chip type */
rev_type = readreg(dev, PRODUCT_ID_ADD);
lp->chip_type = rev_type &~ REVISON_BITS;
lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
/* Check the chip type and revision in order to set the correct send command
CS8920 revision C and CS8900 revision F can use the faster send. */
lp->send_cmd = TX_AFTER_381;
if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
lp->send_cmd = TX_NOW;
if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
lp->send_cmd = TX_NOW;
if (net_debug && version_printed++ == 0)
printk(version);
printk(KERN_INFO "%s: cs89%c0%s rev %c found at %#8lx",
dev->name,
lp->chip_type==CS8900?'0':'2',
lp->chip_type==CS8920M?"M":"",
lp->chip_revision,
dev->base_addr);
/* Try to read the MAC address */
if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
printk("\nmac89x0: No EEPROM, giving up now.\n");
kfree(dev->priv);
dev->priv = NULL;
return -ENODEV;
} else {
for (i = 0; i < ETH_ALEN; i += 2) {
/* Big-endian (why??!) */
unsigned short s = readreg(dev, PP_IA + i);
dev->dev_addr[i] = s >> 8;
dev->dev_addr[i+1] = s & 0xff;
}
}
dev->irq = SLOT2IRQ(slot);
printk(" IRQ %d ADDR ", dev->irq);
/* print the ethernet address. */
for (i = 0; i < ETH_ALEN; i++)
printk("%2.2x%s", dev->dev_addr[i],
((i < ETH_ALEN-1) ? ":" : ""));
dev->open = net_open;
dev->stop = net_close;
dev->hard_start_xmit = net_send_packet;
dev->get_stats = net_get_stats;
dev->set_multicast_list = &set_multicast_list;
dev->set_mac_address = &set_mac_address;
/* Fill in the fields of the net_device structure with ethernet values. */
ether_setup(dev);
printk("\n");
return 0;
}
