- BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
- sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf),
- UART_XMIT_SIZE,
- (uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
- nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
- if (!nent)
- sci_tx_dma_release(s, false);
- else
- dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n",
- __func__,
- sg_dma_len(&s->sg_tx), port->state->xmit.buf,
- &sg_dma_address(&s->sg_tx));
-
- s->sg_len_tx = nent;
+ s->tx_dma_addr = dma_map_single(chan->device->dev,
+ port->state->xmit.buf,
+ UART_XMIT_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(chan->device->dev, s->tx_dma_addr)) {
+ dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n");
+ dma_release_channel(chan);
+ s->chan_tx = NULL;
+ } else {
+ dev_dbg(port->dev, "%s: mapped %lu@%p to %pad\n",
+ __func__, UART_XMIT_SIZE,
+ port->state->xmit.buf, &s->tx_dma_addr);
+ }