From patchwork Sun Dec 6 23:20:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ondrej Zary X-Patchwork-Id: 7779651 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DF8F2BEEE1 for ; Sun, 6 Dec 2015 23:21:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 01E1620434 for ; Sun, 6 Dec 2015 23:21:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E97A620421 for ; Sun, 6 Dec 2015 23:21:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754882AbbLFXVA (ORCPT ); Sun, 6 Dec 2015 18:21:00 -0500 Received: from ns.gsystem.sk ([62.176.172.50]:40802 "EHLO gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754809AbbLFXU7 (ORCPT ); Sun, 6 Dec 2015 18:20:59 -0500 Received: from stip-static-68.213-81-217.telecom.sk ([213.81.217.68] helo=gsql.ggedos.sk) by gsystem.sk with esmtpsa (TLS1.1:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1a5ibw-0006Nw-5W; Mon, 07 Dec 2015 00:20:56 +0100 From: Ondrej Zary To: Finn Thain , Michael Schmitz , linux-m68k@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 76/71] ncr5380: Enable PDMA for DTC chips Date: Mon, 7 Dec 2015 00:20:48 +0100 Message-Id: <1449444048-29757-1-git-send-email-linux@rainbow-software.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <20151118083455.331768508@telegraphics.com.au> References: <20151118083455.331768508@telegraphics.com.au> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add I/O register mapping for DTC chips and enable PDMA mode. These chips have 16-bit wide HOST BUFFER register and it must be read by 16-bit accesses (we lose data otherwise). Large PIO transfers crash at least the DTCT-436P chip (all reads result in 0xFF) so this patch actually makes it work. The chip also crashes when we bang the C400 host status register too heavily after PDMA write - a small udelay is needed. Tested on DTCT-436P and verified that it does not break 53C400A. Signed-off-by: Ondrej Zary --- drivers/scsi/g_NCR5380.c | 39 +++++++++++++++++++++++++++++++-------- drivers/scsi/g_NCR5380.h | 3 ++- 2 files changed, 33 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index 578d4fa..ef719cf0 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -328,7 +328,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) ports = ncr_53c400a_ports; break; case BOARD_DTC3181E: - flags = FLAG_NO_PSEUDO_DMA; + flags = FLAG_NO_DMA_FIXUP; ports = dtc_3181e_ports; break; } @@ -401,6 +401,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) #ifndef SCSI_G_NCR5380_MEM instance->io_port = overrides[current_override].NCR5380_map_name; instance->n_io_port = region_size; + hostdata->io_width = 1; /* 8-bit PDMA by default */ /* * On NCR53C400 boards, NCR5380 registers are mapped 8 past @@ -413,6 +414,9 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) hostdata->c400_blk_cnt = 1; hostdata->c400_host_buf = 4; break; + case BOARD_DTC3181E: + hostdata->io_width = 2; /* 16-bit PDMA */ + /* fall through */ case BOARD_NCR53C400A: hostdata->c400_ctl_status = 9; hostdata->c400_blk_cnt = 10; @@ -433,7 +437,8 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt) goto out_unregister; if (overrides[current_override].board == BOARD_NCR53C400 || - overrides[current_override].board == BOARD_NCR53C400A) + overrides[current_override].board == BOARD_NCR53C400A || + overrides[current_override].board == BOARD_DTC3181E) NCR5380_write(hostdata->c400_ctl_status, CSR_BASE); NCR5380_maybe_reset_bus(instance); @@ -559,7 +564,11 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, ; /* FIXME - no timeout */ #ifndef SCSI_G_NCR5380_MEM - insb(instance->io_port + hostdata->c400_host_buf, + if (hostdata->io_width == 2) + insw(instance->io_port + hostdata->c400_host_buf, + dst + start, 64); + else + insb(instance->io_port + hostdata->c400_host_buf, dst + start, 128); #else /* implies SCSI_G_NCR5380_MEM */ @@ -575,7 +584,11 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, ; /* FIXME - no timeout */ #ifndef SCSI_G_NCR5380_MEM - insb(instance->io_port + hostdata->c400_host_buf, + if (hostdata->io_width == 2) + insw(instance->io_port + hostdata->c400_host_buf, + dst + start, 64); + else + insb(instance->io_port + hostdata->c400_host_buf, dst + start, 128); #else /* implies SCSI_G_NCR5380_MEM */ @@ -633,7 +646,11 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY) ; // FIXME - timeout #ifndef SCSI_G_NCR5380_MEM - outsb(instance->io_port + hostdata->c400_host_buf, + if (hostdata->io_width == 2) + outsw(instance->io_port + hostdata->c400_host_buf, + src + start, 64); + else + outsb(instance->io_port + hostdata->c400_host_buf, src + start, 128); #else /* implies SCSI_G_NCR5380_MEM */ @@ -648,7 +665,11 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, ; // FIXME - no timeout #ifndef SCSI_G_NCR5380_MEM - outsb(instance->io_port + hostdata->c400_host_buf, + if (hostdata->io_width == 2) + outsw(instance->io_port + hostdata->c400_host_buf, + src + start, 64); + else + outsb(instance->io_port + hostdata->c400_host_buf, src + start, 128); #else /* implies SCSI_G_NCR5380_MEM */ @@ -669,8 +690,10 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, /* All documentation says to check for this. Maybe my hardware is too * fast. Waiting for it seems to work fine! KLL */ - while (!(i = NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ)) - ; // FIXME - no timeout + while (!(i = NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ)) { + udelay(4); /* DTC436 chip hangs without this */ + /* FIXME - no timeout */ + } /* * I know. i is certainly != 0 here but the loop is new. See previous diff --git a/drivers/scsi/g_NCR5380.h b/drivers/scsi/g_NCR5380.h index c5e57b7..5ab64d9 100644 --- a/drivers/scsi/g_NCR5380.h +++ b/drivers/scsi/g_NCR5380.h @@ -44,7 +44,8 @@ #define NCR5380_implementation_fields \ int c400_ctl_status; \ int c400_blk_cnt; \ - int c400_host_buf; + int c400_host_buf; \ + int io_width; #else /* therefore SCSI_G_NCR5380_MEM */