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ncr5380: Adopt uniform DMA setup convention

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Standardize the DMA setup hooks so that the DMA implementation in
atari_NCR5380.c can be reconciled with pseudo DMA implementation in
NCR5380.c.

Calls to NCR5380_dma_recv_setup() and NCR5380_dma_send_setup() return
a negative value on failure, zero on PDMA transfer success and a positive
byte count for DMA setup success.

This convention is not entirely new, but is now applied consistently.

Also remove a pointless Status Register access: the *phase assignment is
redundant because after NCR5380_transfer_dma() returns control to
NCR5380_information_transfer(), that routine then returns control
to NCR5380_main(), which means *phase is dead.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2016-03-23 21:10:18 +11:00 committed by Martin K. Petersen
parent 6c4b88ca59
commit 438af51c64
4 changed files with 20 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/scsi/NCR5380.c
View File

@ -1431,7 +1431,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
register unsigned char p = *phase;
register unsigned char *d = *data;
unsigned char tmp;
int foo;
int result;
if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
*phase = tmp;
@ -1505,9 +1505,9 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
*/
if (p & SR_IO) {
foo = NCR5380_dma_recv_setup(instance, d,
result = 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 Scsi_Host *instance,
if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG,
BASR_DRQ, BASR_DRQ, HZ) < 0) {
foo = -1;
result = -1;
shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n");
}
if (NCR5380_poll_politely(instance, STATUS_REG,
SR_REQ, 0, HZ) < 0) {
foo = -1;
result = -1;
shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
}
d[c - 1] = NCR5380_read(INPUT_DATA_REG);
}
} else {
foo = NCR5380_dma_send_setup(instance, d, c);
if (!foo && (hostdata->flags & FLAG_DMA_FIXUP)) {
result = 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 for
* the byte we're interested, we'll ACK it and it will go false.
@ -1545,7 +1545,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
if (NCR5380_poll_politely2(instance,
BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
foo = -1;
result = -1;
shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n");
}
}
@ -1555,8 +1555,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
*data = d + c;
*count = 0;
*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
return foo;
return result;
}
/*
@ -1652,7 +1651,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
if (!cmd->device->borken)
transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
if (transfersize) {
if (transfersize > 0) {
len = transfersize;
if (NCR5380_transfer_dma(instance, &phase,
&len, (unsigned char **)&cmd->SCp.ptr)) {

10
drivers/scsi/arm/cumana_1.c
View File

@ -101,7 +101,10 @@ static inline int cumanascsi_pwrite(struct Scsi_Host *host,
}
end:
writeb(priv(host)->ctrl | 0x40, priv(host)->base + CTRL);
return len;
if (len)
return -1;
return 0;
}
static inline int cumanascsi_pread(struct Scsi_Host *host,
@ -163,7 +166,10 @@ static inline int cumanascsi_pread(struct Scsi_Host *host,
}
end:
writeb(priv(host)->ctrl | 0x40, priv(host)->base + CTRL);
return len;
if (len)
return -1;
return 0;
}
static unsigned char cumanascsi_read(struct Scsi_Host *host, unsigned int reg)

4
drivers/scsi/arm/oak.c
View File

@ -47,13 +47,13 @@ static inline int oakscsi_pwrite(struct Scsi_Host *instance,
void __iomem *base = priv(instance)->base;
printk("writing %p len %d\n",addr, len);
if(!len) return -1;
while(1)
{
int status;
while (((status = readw(base + STAT)) & 0x100)==0);
}
return 0;
}
static inline int oakscsi_pread(struct Scsi_Host *instance,
@ -74,7 +74,7 @@ printk("reading %p len %d\n", addr, len);
if(status & 0x200 || !timeout)
{
printk("status = %08X\n", status);
return 1;
return -1;
}
}

3
drivers/scsi/atari_scsi.c
View File

@ -527,9 +527,6 @@ static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
*/
dma_cache_maintenance(addr, count, dir);
if (count == 0)
printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n");
if (IS_A_TT()) {
tt_scsi_dma.dma_ctrl = dir;
SCSI_DMA_WRITE_P(dma_addr, addr);