/**
* vme_dma_ioctl() - ioctl file method for the VME DMA device
* @file: Device file descriptor
* @cmd: ioctl number
* @arg: ioctl argument
*
* Currently the VME DMA device supports the following ioctl:
*
* VME_IOCTL_START_DMA
*/
long vme_dma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int rc = 0;
struct vme_dma desc;
void __user *argp = (void __user *)arg;
switch (cmd) {
case VME_IOCTL_START_DMA:
/* Get the DMA transfer descriptor */
if (copy_from_user(&desc, (void *)argp, sizeof(struct vme_dma)))
return -EFAULT;
/* Do the DMA */
rc = vme_do_dma(&desc);
if (rc)
return rc;
/*
* Copy back the DMA transfer descriptor containing the DMA
* updated status.
*/
if (copy_to_user((void *)argp, &desc, sizeof(struct vme_dma)))
return -EFAULT;
break;
default:
rc = -ENOIOCTLCMD;
}
return rc;
}
static int do_raw_dma(struct vmeio_dma_op *request)
{
struct vme_dma dma_desc;
unsigned int bu, bl;
int cc;
unsigned int haddr;
bl = (unsigned long)request->buffer;
bu = 0;
memset(&dma_desc, 0, sizeof(dma_desc));
dma_desc.dir = request->direction;
dma_desc.novmeinc = 0;
dma_desc.length = request->byte_length;
dma_desc.ctrl.pci_block_size = VME_DMA_BSIZE_4096;
dma_desc.ctrl.pci_backoff_time = VME_DMA_BACKOFF_0;
dma_desc.ctrl.vme_block_size = VME_DMA_BSIZE_4096;
dma_desc.ctrl.vme_backoff_time = VME_DMA_BACKOFF_0;
dma_desc.dst.data_width = request->data_width;
dma_desc.dst.am = request->am;
dma_desc.src.data_width = request->data_width;
dma_desc.src.am = request->am;
haddr = request->address;
if (request->direction == VME_DMA_TO_DEVICE) {
dma_desc.src.addrl = bl;
dma_desc.src.addru = bu;
dma_desc.dst.addrl = haddr;
} else {
dma_desc.src.addrl = haddr;
dma_desc.dst.addrl = bl;
dma_desc.dst.addru = bu;
}
if ((cc = vme_do_dma(&dma_desc)) < 0)
return cc;
return 0;
}