403 	struct at91_adc_dma		dma_st;  member
752 	if (st->dma_st.dma_chan)  in at91_adc_reenable_trigger()
775 	status = dmaengine_tx_status(st->dma_st.dma_chan,  in at91_adc_dma_size_done()
776 				     st->dma_st.dma_chan->cookie,  in at91_adc_dma_size_done()
782 	i = st->dma_st.rx_buf_sz - state.residue;  in at91_adc_dma_size_done()
785 	if (i >= st->dma_st.buf_idx)  in at91_adc_dma_size_done()
786 		size = i - st->dma_st.buf_idx;  in at91_adc_dma_size_done()
788 		size = st->dma_st.rx_buf_sz + i - st->dma_st.buf_idx;  in at91_adc_dma_size_done()
807 	if (!st->dma_st.dma_chan)  in at91_adc_dma_start()
811 	st->dma_st.buf_idx = 0;  in at91_adc_dma_start()
817 	st->dma_st.rx_buf_sz = 0;  in at91_adc_dma_start()
827 		st->dma_st.rx_buf_sz += chan->scan_type.storagebits / 8;  in at91_adc_dma_start()
829 	st->dma_st.rx_buf_sz *= st->dma_st.watermark;  in at91_adc_dma_start()
832 	desc = dmaengine_prep_dma_cyclic(st->dma_st.dma_chan,  in at91_adc_dma_start()
833 					 st->dma_st.rx_dma_buf,  in at91_adc_dma_start()
834 					 st->dma_st.rx_buf_sz,  in at91_adc_dma_start()
835 					 st->dma_st.rx_buf_sz / 2,  in at91_adc_dma_start()
850 		dmaengine_terminate_async(st->dma_st.dma_chan);  in at91_adc_dma_start()
857 	dma_async_issue_pending(st->dma_st.dma_chan);  in at91_adc_dma_start()
860 	st->dma_st.dma_ts = iio_get_time_ns(indio_dev);  in at91_adc_dma_start()
871 	if (st->dma_st.dma_chan)  in at91_adc_buffer_check_use_irq()
975 		if (st->dma_st.dma_chan)  in at91_adc_buffer_postdisable()
986 	if (st->dma_st.dma_chan)  in at91_adc_buffer_postdisable()
987 		dmaengine_terminate_sync(st->dma_st.dma_chan);  in at91_adc_buffer_postdisable()
1101 	sample_size = div_s64(st->dma_st.rx_buf_sz, st->dma_st.watermark);  in at91_adc_trigger_handler_dma()
1109 	interval = div_s64((ns - st->dma_st.dma_ts), sample_count);  in at91_adc_trigger_handler_dma()
1117 					&st->dma_st.rx_buf[st->dma_st.buf_idx],  in at91_adc_trigger_handler_dma()
1121 				(st->dma_st.rx_buf + st->dma_st.buf_idx),  in at91_adc_trigger_handler_dma()
1122 				(st->dma_st.dma_ts + interval * sample_index));  in at91_adc_trigger_handler_dma()
1126 		st->dma_st.buf_idx += sample_size;  in at91_adc_trigger_handler_dma()
1128 		if (st->dma_st.buf_idx >= st->dma_st.rx_buf_sz)  in at91_adc_trigger_handler_dma()
1129 			st->dma_st.buf_idx = 0;  in at91_adc_trigger_handler_dma()
1133 	st->dma_st.dma_ts = iio_get_time_ns(indio_dev);  in at91_adc_trigger_handler_dma()
1149 	if (st->dma_st.dma_chan)  in at91_adc_trigger_handler()
1322 	} else if (iio_buffer_enabled(indio) && st->dma_st.dma_chan) {  in at91_adc_interrupt()
1502 	if (st->dma_st.dma_chan)  in at91_adc_dma_init()
1505 	st->dma_st.dma_chan = dma_request_chan(&pdev->dev, "rx");  in at91_adc_dma_init()
1506 	if (IS_ERR(st->dma_st.dma_chan))  {  in at91_adc_dma_init()
1508 		st->dma_st.dma_chan = NULL;  in at91_adc_dma_init()
1512 	st->dma_st.rx_buf = dma_alloc_coherent(st->dma_st.dma_chan->device->dev,  in at91_adc_dma_init()
1514 					       &st->dma_st.rx_dma_buf,  in at91_adc_dma_init()
1516 	if (!st->dma_st.rx_buf) {  in at91_adc_dma_init()
1523 	config.src_addr = (phys_addr_t)(st->dma_st.phys_addr  in at91_adc_dma_init()
1529 	if (dmaengine_slave_config(st->dma_st.dma_chan, &config)) {  in at91_adc_dma_init()
1535 		 dma_chan_name(st->dma_st.dma_chan));  in at91_adc_dma_init()
1540 	dma_free_coherent(st->dma_st.dma_chan->device->dev, pages * PAGE_SIZE,  in at91_adc_dma_init()
1541 			  st->dma_st.rx_buf, st->dma_st.rx_dma_buf);  in at91_adc_dma_init()
1543 	dma_release_channel(st->dma_st.dma_chan);  in at91_adc_dma_init()
1544 	st->dma_st.dma_chan = NULL;  in at91_adc_dma_init()
1558 	if (!st->dma_st.dma_chan)  in at91_adc_dma_disable()
1562 	dmaengine_terminate_sync(st->dma_st.dma_chan);  in at91_adc_dma_disable()
1564 	dma_free_coherent(st->dma_st.dma_chan->device->dev, pages * PAGE_SIZE,  in at91_adc_dma_disable()
1565 			  st->dma_st.rx_buf, st->dma_st.rx_dma_buf);  in at91_adc_dma_disable()
1566 	dma_release_channel(st->dma_st.dma_chan);  in at91_adc_dma_disable()
1567 	st->dma_st.dma_chan = NULL;  in at91_adc_dma_disable()
1586 	st->dma_st.watermark = val;  in at91_adc_set_watermark()
1653 	return scnprintf(buf, PAGE_SIZE, "%d\n", !!st->dma_st.dma_chan);  in at91_adc_get_fifo_state()
1662 	return scnprintf(buf, PAGE_SIZE, "%d\n", st->dma_st.watermark);  in at91_adc_get_watermark()
1790 	st->dma_st.phys_addr = res->start;  in at91_adc_probe()
1855 		st->dma_st.watermark = 1;  in at91_adc_probe()