int dma_transfer(DMA_Handle_t handle, /* */
dmacHw_TRANSFER_TYPE_e transferType, /* */
dma_addr_t srcData, /* */
dma_addr_t dstData, /* */
size_t numBytes /* */
) {
DMA_Channel_t *channel;
DMA_DeviceAttribute_t *devAttr;
int rc = 0;
channel = HandleToChannel(handle);
if (channel == NULL) {
return -ENODEV;
}
devAttr = &DMA_gDeviceAttribute[channel->devType];
if (devAttr->config.transferType != transferType) {
return -EINVAL;
}
/* */
/* */
/* */
{
rc =
dma_alloc_descriptors(handle, transferType, srcData,
dstData, numBytes);
if (rc != 0) {
return rc;
}
}
/* */
devAttr->numBytes = numBytes;
devAttr->transferStartTime = timer_get_tick_count();
dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config,
devAttr->ring.virtAddr);
/* */
return 0;
}
int dma_transfer(DMA_Handle_t handle, /* DMA Handle */
dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */
dma_addr_t srcData, /* Place to get data to write to device */
dma_addr_t dstData, /* Pointer to device data address */
size_t numBytes /* Number of bytes to transfer to the device */
) {
DMA_Channel_t *channel;
DMA_DeviceAttribute_t *devAttr;
int rc = 0;
channel = HandleToChannel(handle);
if (channel == NULL) {
return -ENODEV;
}
devAttr = &DMA_gDeviceAttribute[channel->devType];
if (devAttr->config.transferType != transferType) {
return -EINVAL;
}
/* We keep track of the information about the previous request for this */
/* device, and if the attributes match, then we can use the descriptors we setup */
/* the last time, and not have to reinitialize everything. */
{
rc =
dma_alloc_descriptors(handle, transferType, srcData,
dstData, numBytes);
if (rc != 0) {
return rc;
}
}
/* And kick off the transfer */
devAttr->numBytes = numBytes;
devAttr->transferStartTime = timer_get_tick_count();
dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config,
devAttr->ring.virtAddr);
/* Since we got this far, everything went successfully */
return 0;
}
