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fix loading of 0 to intended value of 256. closes 1871

This commit is contained in:
chopps 1996-01-28 19:29:15 +00:00
parent 225c9b3965
commit f14299b866
1 changed files with 40 additions and 37 deletions
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77
sys/arch/amiga/dev/sfas.c
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@ -1404,54 +1404,57 @@ sfas_postaction(dev, rp, nexus)
* from the DMA block. */
dev->sc_setup_dma(dev, 0, 0, SFAS_DMA_CLEAR);
if (dev->sc_cur_link < dev->sc_max_link) {
if (!dev->sc_dma_blk_len) {
dev->sc_dma_blk_ptr = dev->sc_chain[dev->sc_cur_link].ptr;
dev->sc_dma_blk_len = dev->sc_chain[dev->sc_cur_link].len;
dev->sc_dma_blk_flg = dev->sc_chain[dev->sc_cur_link].flg;
}
if (!dev->sc_dma_blk_len) {
dev->sc_dma_blk_ptr =
dev->sc_chain[dev->sc_cur_link].ptr;
dev->sc_dma_blk_len =
dev->sc_chain[dev->sc_cur_link].len;
dev->sc_dma_blk_flg =
dev->sc_chain[dev->sc_cur_link].flg;
}
/* We should use polled IO here. */
if (dev->sc_dma_blk_flg == SFAS_CHAIN_PRG) {
sfas_ixfer(dev);
dev->sc_cur_link++;
dev->sc_dma_len = 0;
break;
}
else if (dev->sc_dma_blk_flg == SFAS_CHAIN_BUMP)
len = dev->sc_dma_blk_len;
else
len = dev->sc_need_bump(dev, dev->sc_dma_blk_ptr,
dev->sc_dma_blk_len);
/* We should use polled IO here. */
if (dev->sc_dma_blk_flg == SFAS_CHAIN_PRG) {
sfas_ixfer(dev);
dev->sc_cur_link++;
dev->sc_dma_len = 0;
break;
} else if (dev->sc_dma_blk_flg == SFAS_CHAIN_BUMP)
len = dev->sc_dma_blk_len;
else
len = dev->sc_need_bump(dev,
dev->sc_dma_blk_ptr, dev->sc_dma_blk_len);
/*
* If len != 0 we must bump the data, else we just DMA it
* straight into memory.
*/
if (len) {
dev->sc_dma_buf = dev->sc_bump_pa;
dev->sc_dma_len = len;
/*
* If len != 0 we must bump the data, else we just
* DMA it straight into memory.
*/
if (len) {
dev->sc_dma_buf = dev->sc_bump_pa;
dev->sc_dma_len = len;
if (nexus->state == SFAS_NS_DATA_OUT)
bcopy(dev->sc_buf, dev->sc_bump_va, dev->sc_dma_len);
} else {
dev->sc_dma_buf = dev->sc_dma_blk_ptr;
dev->sc_dma_len = dev->sc_dma_blk_len;
}
if (nexus->state == SFAS_NS_DATA_OUT)
bcopy(dev->sc_buf, dev->sc_bump_va,
dev->sc_dma_len);
} else {
dev->sc_dma_buf = dev->sc_dma_blk_ptr;
dev->sc_dma_len = dev->sc_dma_blk_len;
}
/* Load DMA with adress and length of transfer. */
dev->sc_setup_dma(dev, dev->sc_dma_buf, dev->sc_dma_len,
((nexus->state == SFAS_NS_DATA_OUT) ?
SFAS_DMA_WRITE : SFAS_DMA_READ));
/* Load DMA with adress and length of transfer. */
dev->sc_setup_dma(dev, dev->sc_dma_buf, dev->sc_dma_len,
((nexus->state == SFAS_NS_DATA_OUT)
? SFAS_DMA_WRITE : SFAS_DMA_READ));
cmd = SFAS_CMD_TRANSFER_INFO | SFAS_CMD_DMA;
cmd = SFAS_CMD_TRANSFER_INFO | SFAS_CMD_DMA;
} else {
/*
* Hmmm, the unit wants more info than we have or has
* more than we want. Let the chip handle that.
*/
*rp->sfas_tc_low = 256;
*rp->sfas_tc_mid = 0;
*rp->sfas_tc_low = 0;
*rp->sfas_tc_mid = 1;
*rp->sfas_tc_high = 0;
cmd = SFAS_CMD_TRANSFER_PAD;
}