static int Xil_DMA_Prep_Buf_Ctl(xil_dma* const me, int device_id, uint32_t * ptr,
uint32_t length, enum xdma_direction dir)
{
struct xdma_buf_info buf;
buf.chan = (dir==XDMA_MEM_TO_DEV?
me->xdma_devices[device_id].tx_chan:me->xdma_devices[device_id].rx_chan);
buf.completion = (dir==XDMA_MEM_TO_DEV?
me->xdma_devices[device_id].tx_cmp:me->xdma_devices[device_id].rx_cmp);
buf.cookie = 0;
buf.buf_offset = (u32) xdma_calc_offset(me, ptr);
buf.buf_size = (u32) (length * sizeof(ptr[0]));
buf.dir = dir;
int ret = (int)ioctl(me->fd, XDMA_PREP_BUF, &buf);
if(ret < 0)
{
printf("Error ioctl set %s buf", dir==XDMA_MEM_TO_DEV?"tx":"rx");
return ret;
}
return 0;
}
/* Perform DMA transaction
*
* To perform a one-way transaction set the unused directions pointer to NULL
* or length to zero.
*/
int xdma_perform_transaction(int device_id, enum xdma_wait wait,
uint32_t * src_ptr, uint32_t src_length,
uint32_t * dst_ptr, uint32_t dst_length)
{
int ret = 0;
struct xdma_buf_info dst_buf;
struct xdma_buf_info src_buf;
struct xdma_transfer dst_trans;
struct xdma_transfer src_trans;
const bool src_used = ((src_ptr != NULL) && (src_length != 0));
const bool dst_used = ((dst_ptr != NULL) && (dst_length != 0));
if (device_id >= num_of_devices) {
perror("Error invalid device ID");
return -1;
}
if (src_used) {
src_buf.chan = xdma_devices[device_id].tx_chan;
src_buf.completion = xdma_devices[device_id].tx_cmp;
src_buf.cookie = 0;
src_buf.buf_offset = (u32) xdma_calc_offset(src_ptr);
src_buf.buf_size = (u32) (src_length * sizeof(src_ptr[0]));
src_buf.dir = XDMA_MEM_TO_DEV;
ret = (int)ioctl(fd, XDMA_PREP_BUF, &src_buf);
if (ret < 0) {
perror("Error ioctl set src (tx) buf");
return ret;
}
}
if (dst_used) {
dst_buf.chan = xdma_devices[device_id].rx_chan;
dst_buf.completion = xdma_devices[device_id].rx_cmp;
dst_buf.cookie = 0;
dst_buf.buf_offset = (u32) xdma_calc_offset(dst_ptr);
dst_buf.buf_size = (u32) (dst_length * sizeof(dst_ptr[0]));
dst_buf.dir = XDMA_DEV_TO_MEM;
ret = (int)ioctl(fd, XDMA_PREP_BUF, &dst_buf);
if (ret < 0) {
perror("Error ioctl set dst (rx) buf");
return ret;
}
}
if (src_used) {
src_trans.chan = xdma_devices[device_id].tx_chan;
src_trans.completion = xdma_devices[device_id].tx_cmp;
src_trans.cookie = src_buf.cookie;
src_trans.wait = (0 != (wait & XDMA_WAIT_SRC));
ret = (int)ioctl(fd, XDMA_START_TRANSFER, &src_trans);
if (ret < 0) {
perror("Error ioctl start src (tx) trans");
return ret;
}
}
if (dst_used) {
dst_trans.chan = xdma_devices[device_id].rx_chan;
dst_trans.completion = xdma_devices[device_id].rx_cmp;
dst_trans.cookie = dst_buf.cookie;
dst_trans.wait = (0 != (wait & XDMA_WAIT_DST));
ret = (int)ioctl(fd, XDMA_START_TRANSFER, &dst_trans);
if (ret < 0) {
perror("Error ioctl start dst (rx) trans");
return ret;
}
}
return ret;
}
