static void setup_tx_dma(struct pi_local *lp, int length)
{
unsigned long dma_abs;
unsigned long flags;
unsigned long dmachan;
save_flags(flags);
cli();
dmachan = lp->dmachan;
dma_abs = (unsigned long) (lp->txdmabuf);
if(!valid_dma_page(dma_abs, DMA_BUFF_SIZE + sizeof(struct mbuf)))
panic("PI: TX buffer violates DMA boundary!");
disable_dma(dmachan);
/* Set DMA mode register to single transfers, incrementing address,
* no auto init, reads
*/
set_dma_mode(dmachan, DMA_MODE_WRITE);
clear_dma_ff(dmachan);
set_dma_addr(dmachan, dma_abs);
/* output byte count */
set_dma_count(dmachan, length);
restore_flags(flags);
}
static void setup_rx_dma(struct pt_local *lp)
{
unsigned long flags;
int cmd;
unsigned long dma_abs;
unsigned char dmachan;
save_flags(flags);
cli();
dma_abs = (unsigned long) (lp->rcvbuf->data);
dmachan = lp->dmachan;
cmd = lp->base + CTL;
if(!valid_dma_page(dma_abs, DMA_BUFF_SIZE + sizeof(struct mbuf)))
panic("PI: RX buffer violates DMA boundary!");
/* Get ready for RX DMA */
wrtscc(lp->cardbase, cmd, R1, WT_FN_RDYFN | WT_RDY_RT | INT_ERR_Rx | EXT_INT_ENAB);
disable_dma(dmachan);
clear_dma_ff(dmachan);
/*
* Set DMA mode register to single transfers, incrementing address,
* auto init, writes
*/
set_dma_mode(dmachan, DMA_MODE_READ | 0x10);
set_dma_addr(dmachan, dma_abs);
set_dma_count(dmachan, lp->bufsiz);
enable_dma(dmachan);
/*
* If a packet is already coming in, this line is supposed to
* avoid receiving a partial packet.
*/
wrtscc(lp->cardbase, cmd, R0, RES_Rx_CRC);
/* Enable RX dma */
wrtscc(lp->cardbase, cmd, R1,
WT_RDY_ENAB | WT_FN_RDYFN | WT_RDY_RT | INT_ERR_Rx | EXT_INT_ENAB);
restore_flags(flags);
}