/* Block input and output are easy on shared memory ethercards.
The E21xx makes block_input() especially easy by wrapping the top
ring buffer to the bottom automatically. */
static void
e21_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
short ioaddr = dev->base_addr;
char __iomem *shared_mem = ei_status.mem;
mem_on(ioaddr, shared_mem, (ring_offset>>8));
/* Packet is always in one chunk -- we can copy + cksum. */
eth_io_copy_and_sum(skb, ei_status.mem + (ring_offset & 0xff), count, 0);
mem_off(ioaddr);
}
static void es_block_input(struct net_device *dev, int count, struct sk_buff *skb,
int ring_offset)
{
void __iomem *xfer_start = ei_status.mem + ring_offset - ES_START_PG*256;
if (ring_offset + count > ES_STOP_PG*256) {
/* Packet wraps over end of ring buffer. */
int semi_count = ES_STOP_PG*256 - ring_offset;
memcpy_fromio(skb->data, xfer_start, semi_count);
count -= semi_count;
memcpy_fromio(skb->data + semi_count, ei_status.mem, count);
} else {
/* Packet is in one chunk. */
eth_io_copy_and_sum(skb, xfer_start, count, 0);
}
}
static void ac_block_input(struct net_device *dev, int count, struct sk_buff *skb,
int ring_offset)
{
void __iomem *start = ei_status.mem + ring_offset - AC_START_PG*256;
if (ring_offset + count > AC_STOP_PG*256) {
/* We must wrap the input move. */
int semi_count = AC_STOP_PG*256 - ring_offset;
memcpy_fromio(skb->data, start, semi_count);
count -= semi_count;
memcpy_fromio(skb->data + semi_count,
ei_status.mem + TX_PAGES*256, count);
} else {
/* Packet is in one chunk -- we can copy + cksum. */
eth_io_copy_and_sum(skb, start, count, 0);
}
}
static void
el2_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
{
int boguscount = 0;
void __iomem *base = ei_status.mem;
unsigned short int *buf;
unsigned short word;
/* Maybe enable shared memory just be to be safe... nahh.*/
if (base) { /* Use the shared memory. */
ring_offset -= (EL2_MB1_START_PG<<8);
if (ring_offset + count > EL2_MEMSIZE) {
/* We must wrap the input move. */
int semi_count = EL2_MEMSIZE - ring_offset;
memcpy_fromio(skb->data, base + ring_offset, semi_count);
count -= semi_count;
memcpy_fromio(skb->data + semi_count, base + ei_status.priv, count);
} else {
/* Packet is in one chunk -- we can copy + cksum. */
eth_io_copy_and_sum(skb, base + ring_offset, count, 0);
}
return;
}
/*
* No shared memory, use programmed I/O.
*/
word = (unsigned short) ring_offset;
outb(word>>8, E33G_DMAAH);
outb(word&0xFF, E33G_DMAAL);
outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
| ECNTRL_START, E33G_CNTRL);
/*
* Here I also try to get data as fast as possible. I am betting that I
* can read one extra byte without clobbering anything in the kernel because
* this would only occur on an odd byte-count and allocation of skb->data
* is word-aligned. Variable 'count' is NOT checked. Caller must check
* for a valid count.
* [This is currently quite safe.... but if one day the 3c503 explodes
* you know where to come looking ;)]
*/
buf = (unsigned short int *) skb->data;
count = (count + 1) >> 1;
for(;;)
{
boguscount = 0x1000;
while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
{
if(!boguscount--)
{
printk("%s: FIFO blocked in el2_block_input.\n", dev->name);
el2_reset_8390(dev);
goto blocked;
}
}
if(count > WRD_COUNT)
{
insw(E33G_FIFOH, buf, WRD_COUNT);
buf += WRD_COUNT;
count -= WRD_COUNT;
}
else
{
insw(E33G_FIFOH, buf, count);
break;
}
}
blocked:
;
outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
return;
}
