/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
{
void *addr;
if(sun3_dma_orig_addr != NULL)
dvma_unmap(sun3_dma_orig_addr);
// addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
addr = (void *)dvma_map_vme((unsigned long) data, count);
sun3_dma_orig_addr = addr;
sun3_dma_orig_count = count;
#ifdef SUN3_SCSI_DEBUG
printk("scsi: dma_setup addr %p count %x\n", addr, count);
#endif
// dregs->fifo_count = 0;
#if 0
/* reset fifo */
dregs->csr &= ~CSR_FIFO;
dregs->csr |= CSR_FIFO;
#endif
/* set direction */
if(write_flag)
dregs->csr |= CSR_SEND;
else
dregs->csr &= ~CSR_SEND;
/* reset fifo */
// dregs->csr &= ~CSR_FIFO;
// dregs->csr |= CSR_FIFO;
dregs->csr |= CSR_PACK_ENABLE;
dregs->dma_addr_hi = ((unsigned long)addr >> 16);
dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
dregs->dma_count_hi = 0;
dregs->dma_count_lo = 0;
dregs->fifo_count_hi = 0;
dregs->fifo_count = 0;
#ifdef SUN3_SCSI_DEBUG
printk("scsi: dma_setup done csr %x\n", dregs->csr);
#endif
return count;
}
/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
{
void *addr;
if(sun3_dma_orig_addr != NULL)
dvma_unmap(sun3_dma_orig_addr);
#ifdef SUN3_SCSI_VME
addr = (void *)dvma_map_vme((unsigned long) data, count);
#else
addr = (void *)dvma_map((unsigned long) data, count);
#endif
sun3_dma_orig_addr = addr;
sun3_dma_orig_count = count;
#ifndef SUN3_SCSI_VME
dregs->fifo_count = 0;
sun3_udc_write(UDC_RESET, UDC_CSR);
/* reset fifo */
dregs->csr &= ~CSR_FIFO;
dregs->csr |= CSR_FIFO;
#endif
/* set direction */
if(write_flag)
dregs->csr |= CSR_SEND;
else
dregs->csr &= ~CSR_SEND;
#ifdef SUN3_SCSI_VME
dregs->csr |= CSR_PACK_ENABLE;
dregs->dma_addr_hi = ((unsigned long)addr >> 16);
dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
dregs->dma_count_hi = 0;
dregs->dma_count_lo = 0;
dregs->fifo_count_hi = 0;
dregs->fifo_count = 0;
#else
/* byte count for fifo */
dregs->fifo_count = count;
sun3_udc_write(UDC_RESET, UDC_CSR);
/* reset fifo */
dregs->csr &= ~CSR_FIFO;
dregs->csr |= CSR_FIFO;
if(dregs->fifo_count != count) {
printk("scsi%d: fifo_mismatch %04x not %04x\n",
default_instance->host_no, dregs->fifo_count,
(unsigned int) count);
NCR5380_dprint(NDEBUG_DMA, default_instance);
}
/* setup udc */
udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
udc_regs->count = count/2; /* count in words */
udc_regs->mode_hi = UDC_MODE_HIWORD;
if(write_flag) {
if(count & 1)
udc_regs->count++;
udc_regs->mode_lo = UDC_MODE_LSEND;
udc_regs->rsel = UDC_RSEL_SEND;
} else {
udc_regs->mode_lo = UDC_MODE_LRECV;
udc_regs->rsel = UDC_RSEL_RECV;
}
/* announce location of regs block */
sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
UDC_CHN_HI);
sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
/* set dma master on */
sun3_udc_write(0xd, UDC_MODE);
/* interrupt enable */
sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
#endif
return count;
}