From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH 09/22] ncr5380: Adopt uniform DMA setup convention Date: Mon, 14 Mar 2016 08:36:22 +0100 Message-ID: <56E669F6.8070407@suse.de> References: <20160314042700.596192247@telegraphics.com.au> <20160314042702.976019738@telegraphics.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mx2.suse.de ([195.135.220.15]:55697 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933658AbcCNHgY (ORCPT ); Mon, 14 Mar 2016 03:36:24 -0400 In-Reply-To: <20160314042702.976019738@telegraphics.com.au> Sender: linux-m68k-owner@vger.kernel.org List-Id: linux-m68k@vger.kernel.org To: Finn Thain , "James E.J. Bottomley" , "Martin K. Petersen" , Michael Schmitz , linux-m68k@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org Cc: Ondrej Zary , Sam Creasey On 03/14/2016 05:27 AM, Finn Thain wrote: > Standardize the DMA setup hooks so that the DMA implementation in > atari_NCR5380.c can be reconciled with pseudo DMA implementation in > NCR5380.c. >=20 > Calls to NCR5380_dma_recv_setup() and NCR5380_dma_send_setup() return > a negative value on failure, zero on PDMA transfer success and a posi= tive > byte count for DMA setup success. >=20 > This convention is not entirely new, but is now applied consistently. >=20 > Signed-off-by: Finn Thain >=20 > --- > drivers/scsi/NCR5380.c | 21 ++++++++++----------- > drivers/scsi/arm/cumana_1.c | 10 ++++++++-- > drivers/scsi/arm/oak.c | 4 ++-- > drivers/scsi/atari_scsi.c | 3 --- > 4 files changed, 20 insertions(+), 18 deletions(-) >=20 > Index: linux/drivers/scsi/NCR5380.c > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- linux.orig/drivers/scsi/NCR5380.c 2016-03-14 15:26:34.000000000 += 1100 > +++ linux/drivers/scsi/NCR5380.c 2016-03-14 15:26:37.000000000 +1100 > @@ -1431,7 +1431,7 @@ static int NCR5380_transfer_dma(struct S > register unsigned char p =3D *phase; > register unsigned char *d =3D *data; > unsigned char tmp; > - int foo; > + int result; > =20 > if ((tmp =3D (NCR5380_read(STATUS_REG) & PHASE_MASK)) !=3D p) { > *phase =3D tmp; > @@ -1505,9 +1505,9 @@ static int NCR5380_transfer_dma(struct S > */ > =20 > if (p & SR_IO) { > - foo =3D NCR5380_dma_recv_setup(instance, d, > + result =3D NCR5380_dma_recv_setup(instance, d, > hostdata->flags & FLAG_DMA_FIXUP ? c - 1 : c); > - if (!foo && (hostdata->flags & FLAG_DMA_FIXUP)) { > + if (!result && (hostdata->flags & FLAG_DMA_FIXUP)) { > /* > * The workaround was to transfer fewer bytes than we > * intended to with the pseudo-DMA read function, wait for > @@ -1525,19 +1525,19 @@ static int NCR5380_transfer_dma(struct S > =20 > if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, > BASR_DRQ, BASR_DRQ, HZ) < 0) { > - foo =3D -1; > + result =3D -1; > shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); > } > if (NCR5380_poll_politely(instance, STATUS_REG, > SR_REQ, 0, HZ) < 0) { > - foo =3D -1; > + result =3D -1; > shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); > } > d[c - 1] =3D NCR5380_read(INPUT_DATA_REG); > } > } else { > - foo =3D NCR5380_dma_send_setup(instance, d, c); > - if (!foo && (hostdata->flags & FLAG_DMA_FIXUP)) { > + result =3D NCR5380_dma_send_setup(instance, d, c); > + if (!result && (hostdata->flags & FLAG_DMA_FIXUP)) { > /* > * Wait for the last byte to be sent. If REQ is being asserted f= or > * the byte we're interested, we'll ACK it and it will go false. > @@ -1545,7 +1545,7 @@ static int NCR5380_transfer_dma(struct S > if (NCR5380_poll_politely2(instance, > BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, > BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { > - foo =3D -1; > + result =3D -1; > shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase time= out\n"); > } > } > @@ -1555,8 +1555,7 @@ static int NCR5380_transfer_dma(struct S > NCR5380_read(RESET_PARITY_INTERRUPT_REG); > *data =3D d + c; > *count =3D 0; > - *phase =3D NCR5380_read(STATUS_REG) & PHASE_MASK; > - return foo; > + return result; > } > =20 > /* Don't you miss a phase update here? Cheers, Hannes --=20 Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: F. Imend=F6rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N=FCrnberg)