/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
* Purpose : initialises DMA/PIO
* Params : host - host
* SCpnt - command
* direction - DMA on to/off of card
* min_type - minimum DMA support that we must have for this transfer
* Returns : type of transfer to be performed
*/
static fasdmatype_t
powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
fasdmadir_t direction, fasdmatype_t min_type)
{
PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
int dmach = host->dma_channel;
if (dmach != NO_DMA &&
(min_type == fasdma_real_all || SCp->this_residual >= 512)) {
int buf;
for (buf = 1; buf <= SCp->buffers_residual &&
buf < NR_SG; buf++) {
info->dmasg[buf].address = __virt_to_bus(
(unsigned long)SCp->buffer[buf].address);
info->dmasg[buf].length = SCp->buffer[buf].length;
powertecscsi_invalidate(SCp->buffer[buf].address,
SCp->buffer[buf].length,
direction);
}
info->dmasg[0].address = __virt_to_phys((unsigned long)SCp->ptr);
info->dmasg[0].length = SCp->this_residual;
powertecscsi_invalidate(SCp->ptr,
SCp->this_residual, direction);
disable_dma(dmach);
set_dma_sg(dmach, info->dmasg, buf);
set_dma_mode(dmach,
direction == DMA_OUT ? DMA_MODE_WRITE :
DMA_MODE_READ);
enable_dma(dmach);
return fasdma_real_all;
}
/*
* If we're not doing DMA,
* we'll do slow PIO
*/
return fasdma_pio;
}
/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
* Purpose : initialises DMA/PIO
* Params : host - host
* SCpnt - command
* direction - DMA on to/off of card
* min_type - minimum DMA support that we must have for this transfer
* Returns : type of transfer to be performed
*/
static fasdmatype_t
eesoxscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
fasdmadir_t direction, fasdmatype_t min_type)
{
EESOXScsi_Info *info = (EESOXScsi_Info *)host->hostdata;
int dmach = host->dma_channel;
if (dmach != NO_DMA &&
(min_type == fasdma_real_all || SCp->this_residual >= 512)) {
int buf;
for(buf = 1; buf <= SCp->buffers_residual &&
buf < NR_SG; buf++) {
info->dmasg[buf].address = __virt_to_bus(
(unsigned long)SCp->buffer[buf].address);
info->dmasg[buf].length = SCp->buffer[buf].length;
eesoxscsi_invalidate(SCp->buffer[buf].address,
SCp->buffer[buf].length,
direction);
}
info->dmasg[0].address = __virt_to_phys((unsigned long)SCp->ptr);
info->dmasg[0].length = SCp->this_residual;
eesoxscsi_invalidate(SCp->ptr,
SCp->this_residual, direction);
disable_dma(dmach);
set_dma_sg(dmach, info->dmasg, buf);
set_dma_mode(dmach,
direction == DMA_OUT ? DMA_MODE_WRITE :
DMA_MODE_READ);
enable_dma(dmach);
return fasdma_real_all;
}
/*
* We don't do DMA, we only do slow PIO
*
* Some day, we will do Pseudo DMA
*/
return fasdma_pseudo;
}
