/*
* Either use the shared memory (if enabled on the board) or put the packet
* out through the ASIC FIFO.
*/
static void
el2_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
unsigned short int *wrd;
int boguscount; /* timeout counter */
unsigned short word; /* temporary for better machine code */
if (ei_status.word16) /* Tx packets go into bank 0 on EL2/16 card */
outb(EGACFR_RSEL|EGACFR_TCM, E33G_GACFR);
else
outb(EGACFR_NORM, E33G_GACFR);
if (dev->mem_start) { /* Shared memory transfer */
unsigned long dest_addr = dev->mem_start +
((start_page - ei_status.tx_start_page) << 8);
isa_memcpy_toio(dest_addr, buf, count);
outb(EGACFR_NORM, E33G_GACFR); /* Back to bank1 in case on bank0 */
return;
}
/*
* No shared memory, put the packet out the other way.
* Set up then start the internal memory transfer to Tx Start Page
*/
word = (unsigned short)start_page;
outb(word&0xFF, E33G_DMAAH);
outb(word>>8, E33G_DMAAL);
outb_p((ei_status.interface_num ? ECNTRL_AUI : ECNTRL_THIN ) | ECNTRL_OUTPUT
| ECNTRL_START, E33G_CNTRL);
/*
* Here I am going to write data to the FIFO as quickly as possible.
* Note that E33G_FIFOH is defined incorrectly. It is really
* E33G_FIFOL, the lowest port address for both the byte and
* word write. Variable 'count' is NOT checked. Caller must supply a
* valid count. Note that I may write a harmless extra byte to the
* 8390 if the byte-count was not even.
*/
wrd = (unsigned short int *) buf;
count = (count + 1) >> 1;
for(;;)
{
boguscount = 0x1000;
while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
{
if(!boguscount--)
{
printk("%s: FIFO blocked in el2_block_output.\n", dev->name);
el2_reset_8390(dev);
goto blocked;
}
}
if(count > WRD_COUNT)
{
outsw(E33G_FIFOH, wrd, WRD_COUNT);
wrd += WRD_COUNT;
count -= WRD_COUNT;
}
else
{
outsw(E33G_FIFOH, wrd, count);
break;
}
}
blocked:;
outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
return;
}
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 {
memcpy_fromio(skb->data, base + ring_offset, count);
}
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;
}
