NCR5380.c (e4dec6806aceca768b74c1c6402e6d31ecf3c960) NCR5380.c (1bb4600245d4d40245dd505ca17528e0b9a9ba8c)
1/*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt

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452 "can_queue %d, cmd_per_lun %d, "
453 "sg_tablesize %d, this_id %d, "
454 "flags { %s%s%s}, "
455 "options { %s} ",
456 instance->hostt->name, instance->io_port, instance->n_io_port,
457 instance->base, instance->irq,
458 instance->can_queue, instance->cmd_per_lun,
459 instance->sg_tablesize, instance->this_id,
1/*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt

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452 "can_queue %d, cmd_per_lun %d, "
453 "sg_tablesize %d, this_id %d, "
454 "flags { %s%s%s}, "
455 "options { %s} ",
456 instance->hostt->name, instance->io_port, instance->n_io_port,
457 instance->base, instance->irq,
458 instance->can_queue, instance->cmd_per_lun,
459 instance->sg_tablesize, instance->this_id,
460 hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "",
460 hostdata->flags & FLAG_DMA_FIXUP ? "DMA_FIXUP " : "",
461 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
462 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
463#ifdef AUTOPROBE_IRQ
464 "AUTOPROBE_IRQ "
465#endif
466#ifdef DIFFERENTIAL
467 "DIFFERENTIAL "
468#endif

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1475 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1476
1477 /*
1478 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1479 * were not disabled for the duration of a single DMA transfer, from
1480 * before the setting of DMA mode to after transfer of the last byte.
1481 */
1482
461 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
462 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
463#ifdef AUTOPROBE_IRQ
464 "AUTOPROBE_IRQ "
465#endif
466#ifdef DIFFERENTIAL
467 "DIFFERENTIAL "
468#endif

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1475 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1476
1477 /*
1478 * Note : on my sample board, watch-dog timeouts occurred when interrupts
1479 * were not disabled for the duration of a single DMA transfer, from
1480 * before the setting of DMA mode to after transfer of the last byte.
1481 */
1482
1483 if (hostdata->flags & FLAG_NO_DMA_FIXUP)
1483 if (hostdata->flags & FLAG_DMA_FIXUP)
1484 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY);
1485 else
1484 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1485 MR_ENABLE_EOP_INTR);
1486 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1487 MR_ENABLE_EOP_INTR);
1486 else
1487 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY);
1488
1489 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
1490
1491 /*
1492 * On the PAS16 at least I/O recovery delays are not needed here.
1493 * Everyone else seems to want them.
1494 */
1495

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1535 * problem. The chosen fix is to DMA fewer bytes, then check for the
1536 * condition before taking the NCR5380 out of DMA mode. One or two extra
1537 * bytes are transferred via PIO as necessary to fill out the original
1538 * request.
1539 */
1540
1541 if (p & SR_IO) {
1542 foo = NCR5380_pread(instance, d,
1488
1489 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
1490
1491 /*
1492 * On the PAS16 at least I/O recovery delays are not needed here.
1493 * Everyone else seems to want them.
1494 */
1495

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1535 * problem. The chosen fix is to DMA fewer bytes, then check for the
1536 * condition before taking the NCR5380 out of DMA mode. One or two extra
1537 * bytes are transferred via PIO as necessary to fill out the original
1538 * request.
1539 */
1540
1541 if (p & SR_IO) {
1542 foo = NCR5380_pread(instance, d,
1543 hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1);
1544 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
1543 hostdata->flags & FLAG_DMA_FIXUP ? c - 1 : c);
1544 if (!foo && (hostdata->flags & FLAG_DMA_FIXUP)) {
1545 /*
1546 * The workaround was to transfer fewer bytes than we
1547 * intended to with the pseudo-DMA read function, wait for
1548 * the chip to latch the last byte, read it, and then disable
1549 * pseudo-DMA mode.
1550 *
1551 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1552 * REQ is deasserted when ACK is asserted, and not reasserted

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1566 SR_REQ, 0, HZ) < 0) {
1567 foo = -1;
1568 shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
1569 }
1570 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
1571 }
1572 } else {
1573 foo = NCR5380_pwrite(instance, d, c);
1545 /*
1546 * The workaround was to transfer fewer bytes than we
1547 * intended to with the pseudo-DMA read function, wait for
1548 * the chip to latch the last byte, read it, and then disable
1549 * pseudo-DMA mode.
1550 *
1551 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1552 * REQ is deasserted when ACK is asserted, and not reasserted

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1566 SR_REQ, 0, HZ) < 0) {
1567 foo = -1;
1568 shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
1569 }
1570 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
1571 }
1572 } else {
1573 foo = NCR5380_pwrite(instance, d, c);
1574 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
1574 if (!foo && (hostdata->flags & FLAG_DMA_FIXUP)) {
1575 /*
1576 * Wait for the last byte to be sent. If REQ is being asserted for
1577 * the byte we're interested, we'll ACK it and it will go false.
1578 */
1579 if (NCR5380_poll_politely2(instance,
1580 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
1581 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
1582 foo = -1;

--- 695 unchanged lines hidden --- 		1575 /*
1576 * Wait for the last byte to be sent. If REQ is being asserted for
1577 * the byte we're interested, we'll ACK it and it will go false.
1578 */
1579 if (NCR5380_poll_politely2(instance,
1580 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
1581 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
1582 foo = -1;

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