Commit ef1081cb authored by Finn Thain's avatar Finn Thain Committed by Christoph Hellwig

atari_NCR5380: Refactor Falcon special cases

Make the atari_NCR5380.c core driver usable by sun3_scsi, mac_scsi and
others by moving some of the Falcon-specific code out of the core driver:
!IS_A_TT, atari_read_overruns and falcon_dont_release. Replace these with
hostdata variables and flags. FLAG_CHECK_LAST_BYTE_SENT is unused in
atari_NCR5380.c so don't set it.
Signed-off-by: default avatarFinn Thain <[email protected]>
Reviewed-by: Hannes Reinecke's avatarHannes Reinecke <[email protected]>
Tested-by: default avatarMichael Schmitz <[email protected]>
Signed-off-by: default avatarChristoph Hellwig <[email protected]>
parent f5275902
......@@ -241,6 +241,7 @@
#define FLAG_NCR53C400 4 /* NCR53c400 */
#define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */
#define FLAG_DTC3181E 16 /* DTC3181E */
#define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */
#ifndef ASM
struct NCR5380_hostdata {
......@@ -269,6 +270,9 @@ struct NCR5380_hostdata {
struct delayed_work coroutine; /* our co-routine */
struct scsi_eh_save ses;
char info[256];
int read_overruns; /* number of bytes to cut from a
* transfer to handle chip overruns */
int retain_dma_intr;
#ifdef PSEUDO_DMA
unsigned spin_max_r;
unsigned spin_max_w;
......
......@@ -839,7 +839,7 @@ static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
hostdata->connected = NULL;
hostdata->issue_queue = NULL;
hostdata->disconnected_queue = NULL;
hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
hostdata->flags = flags;
if (!the_template) {
the_template = instance->hostt;
......@@ -1054,7 +1054,7 @@ static void NCR5380_main(struct work_struct *work)
hostdata->issue_queue = NEXT(tmp);
}
SET_NEXT(tmp, NULL);
falcon_dont_release++;
hostdata->retain_dma_intr++;
/* reenable interrupts after finding one */
local_irq_restore(flags);
......@@ -1082,7 +1082,7 @@ static void NCR5380_main(struct work_struct *work)
cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
#endif
if (!NCR5380_select(instance, tmp)) {
falcon_dont_release--;
hostdata->retain_dma_intr--;
/* release if target did not response! */
falcon_release_lock_if_possible(hostdata);
break;
......@@ -1094,7 +1094,7 @@ static void NCR5380_main(struct work_struct *work)
#ifdef SUPPORT_TAGS
cmd_free_tag(tmp);
#endif
falcon_dont_release--;
hostdata->retain_dma_intr--;
local_irq_restore(flags);
dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, "
"returned to issue_queue\n", HOSTNO);
......@@ -1151,7 +1151,7 @@ static void NCR5380_dma_complete(struct Scsi_Host *instance)
return;
}
if (atari_read_overruns) {
if (hostdata->read_overruns) {
p = hostdata->connected->SCp.phase;
if (p & SR_IO) {
udelay(10);
......@@ -1181,9 +1181,9 @@ static void NCR5380_dma_complete(struct Scsi_Host *instance)
*data += transfered;
*count -= transfered;
if (atari_read_overruns) {
if (hostdata->read_overruns) {
if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
cnt = toPIO = atari_read_overruns;
cnt = toPIO = hostdata->read_overruns;
if (overrun) {
dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
*(*data)++ = saved_data;
......@@ -1838,8 +1838,8 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
return -1;
}
if (atari_read_overruns && (p & SR_IO))
c -= atari_read_overruns;
if (hostdata->read_overruns && (p & SR_IO))
c -= hostdata->read_overruns;
dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
HOSTNO, (p & SR_IO) ? "reading" : "writing",
......@@ -1851,7 +1851,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
#endif /* def REAL_DMA */
if (IS_A_TT()) {
if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) {
/* On the Medusa, it is a must to initialize the DMA before
* starting the NCR. This is also the cleaner way for the TT.
*/
......@@ -1869,7 +1869,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
NCR5380_write(START_DMA_SEND_REG, 0);
}
if (!IS_A_TT()) {
if (hostdata->flags & FLAG_LATE_DMA_SETUP) {
/* On the Falcon, the DMA setup must be done after the last */
/* NCR access, else the DMA setup gets trashed!
*/
......@@ -2084,7 +2084,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
/* Accept message by clearing ACK */
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
/* ++guenther: possible race with Falcon locking */
falcon_dont_release++;
hostdata->retain_dma_intr++;
hostdata->connected = NULL;
dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu "
"completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
......@@ -2167,7 +2167,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
barrier();
falcon_dont_release--;
hostdata->retain_dma_intr--;
/* ++roman: For Falcon SCSI, release the lock on the
* ST-DMA here if no other commands are waiting on the
* disconnected queue.
......@@ -2474,7 +2474,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
#endif
) {
/* ++guenther: prevent race with falcon_release_lock */
falcon_dont_release++;
hostdata->retain_dma_intr++;
if (prev) {
REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
SET_NEXT(prev, NEXT(tmp));
......@@ -2512,7 +2512,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
hostdata->connected = tmp;
dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
falcon_dont_release--;
hostdata->retain_dma_intr--;
}
......
......@@ -196,8 +196,6 @@ static char *atari_dma_orig_addr;
/* mask for address bits that can't be used with the ST-DMA */
static unsigned long atari_dma_stram_mask;
#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
/* number of bytes to cut from a transfer to handle NCR overruns */
static int atari_read_overruns;
#endif
static int setup_can_queue = -1;
......@@ -446,8 +444,6 @@ static void atari_scsi_fetch_restbytes(void)
#endif /* REAL_DMA */
static int falcon_dont_release = 0;
/* This function releases the lock on the DMA chip if there is no
* connected command and the disconnected queue is empty.
*/
......@@ -464,7 +460,7 @@ static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata)
if (!hostdata->disconnected_queue &&
!hostdata->issue_queue &&
!hostdata->connected &&
!falcon_dont_release &&
!hostdata->retain_dma_intr &&
stdma_is_locked_by(scsi_falcon_intr))
stdma_release();
......@@ -846,6 +842,7 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
struct Scsi_Host *instance;
int error;
struct resource *irq;
int host_flags = 0;
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq)
......@@ -942,7 +939,9 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
instance->irq = irq->start;
NCR5380_init(instance, 0);
host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP;
NCR5380_init(instance, host_flags);
if (IS_A_TT()) {
error = request_irq(instance->irq, scsi_tt_intr, 0,
......@@ -965,12 +964,16 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
*
* In principle it should be sufficient to do max. 1 byte with
* PIO, but there is another problem on the Medusa with the DMA
* rest data register. So 'atari_read_overruns' is currently set
* rest data register. So read_overruns is currently set
* to 4 to avoid having transfers that aren't a multiple of 4.
* If the rest data bug is fixed, this can be lowered to 1.
*/
if (MACH_IS_MEDUSA)
atari_read_overruns = 4;
if (MACH_IS_MEDUSA) {
struct NCR5380_hostdata *hostdata =
shost_priv(instance);
hostdata->read_overruns = 4;
}
#endif
} else {
/* Nothing to do for the interrupt: the ST-DMA is initialized
......
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