linux-kernel - [PATCH v2 74/71] ncr5380: Enable PDMA for NCR53C400A

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Message-Id: <1449440489-9986-1-git-send-email-linux@rainbow-software.org>
Date:	Sun,  6 Dec 2015 23:21:29 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Finn Thain <fthain@...egraphics.com.au>,
	Michael Schmitz <schmitzmic@...il.com>,
	linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 74/71] ncr5380: Enable PDMA for NCR53C400A

Add I/O register mapping for NCR53C400A and enable PDMA mode to
improve performance and fix non-working IRQ.

Tested with HP C2502 (and user-space enabler).

Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
---
 drivers/scsi/g_NCR5380.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index 86740fd..099fdac 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -324,7 +324,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 #endif
 			break;
 		case BOARD_NCR53C400A:
-			flags = FLAG_NO_PSEUDO_DMA;
+			flags = FLAG_NO_DMA_FIXUP;
 			ports = ncr_53c400a_ports;
 			break;
 		case BOARD_DTC3181E:
@@ -406,11 +406,18 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 		 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 		 * the base address.
 		 */
-		if (overrides[current_override].board == BOARD_NCR53C400) {
+		switch (overrides[current_override].board) {
+		case BOARD_NCR53C400:
 			instance->io_port += 8;
 			hostdata->c400_ctl_status = 0;
 			hostdata->c400_blk_cnt = 1;
 			hostdata->c400_host_buf = 4;
+			break;
+		case BOARD_NCR53C400A:
+			hostdata->c400_ctl_status = 9;
+			hostdata->c400_blk_cnt = 10;
+			hostdata->c400_host_buf = 8;
+			break;
 		}
 #else
 		instance->base = overrides[current_override].NCR5380_map_name;
@@ -425,7 +432,8 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
 		if (NCR5380_init(instance, flags))
 			goto out_unregister;
 
-		if (overrides[current_override].board == BOARD_NCR53C400)
+		if (overrides[current_override].board == BOARD_NCR53C400 ||
+		    overrides[current_override].board == BOARD_NCR53C400A)
 			NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 
 		NCR5380_maybe_reset_bus(instance);
-- 
Ondrej Zary

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