408 	struct at91_adc_dma		dma_st;  member
761 			if (!st->dma_st.dma_chan) {  in at91_adc_configure_trigger()
767 			if (!st->dma_st.dma_chan) {  in at91_adc_configure_trigger()
785 	if (st->dma_st.dma_chan)  in at91_adc_reenable_trigger()
807 	status = dmaengine_tx_status(st->dma_st.dma_chan,  in at91_adc_dma_size_done()
808 				     st->dma_st.dma_chan->cookie,  in at91_adc_dma_size_done()
814 	i = st->dma_st.rx_buf_sz - state.residue;  in at91_adc_dma_size_done()
817 	if (i >= st->dma_st.buf_idx)  in at91_adc_dma_size_done()
818 		size = i - st->dma_st.buf_idx;  in at91_adc_dma_size_done()
820 		size = st->dma_st.rx_buf_sz + i - st->dma_st.buf_idx;  in at91_adc_dma_size_done()
839 	if (!st->dma_st.dma_chan)  in at91_adc_dma_start()
843 	st->dma_st.buf_idx = 0;  in at91_adc_dma_start()
849 	st->dma_st.rx_buf_sz = 0;  in at91_adc_dma_start()
859 		st->dma_st.rx_buf_sz += chan->scan_type.storagebits / 8;  in at91_adc_dma_start()
861 	st->dma_st.rx_buf_sz *= st->dma_st.watermark;  in at91_adc_dma_start()
864 	desc = dmaengine_prep_dma_cyclic(st->dma_st.dma_chan,  in at91_adc_dma_start()
865 					 st->dma_st.rx_dma_buf,  in at91_adc_dma_start()
866 					 st->dma_st.rx_buf_sz,  in at91_adc_dma_start()
867 					 st->dma_st.rx_buf_sz / 2,  in at91_adc_dma_start()
882 		dmaengine_terminate_async(st->dma_st.dma_chan);  in at91_adc_dma_start()
889 	dma_async_issue_pending(st->dma_st.dma_chan);  in at91_adc_dma_start()
892 	st->dma_st.dma_ts = iio_get_time_ns(indio_dev);  in at91_adc_dma_start()
947 	if (!st->dma_st.dma_chan)  in at91_adc_buffer_predisable()
951 	dmaengine_terminate_sync(st->dma_st.dma_chan);  in at91_adc_buffer_predisable()
969 		if (st->dma_st.dma_chan)  in at91_adc_buffer_predisable()
1072 	sample_size = div_s64(st->dma_st.rx_buf_sz, st->dma_st.watermark);  in at91_adc_trigger_handler_dma()
1080 	interval = div_s64((ns - st->dma_st.dma_ts), sample_count);  in at91_adc_trigger_handler_dma()
1088 					&st->dma_st.rx_buf[st->dma_st.buf_idx],  in at91_adc_trigger_handler_dma()
1092 				(st->dma_st.rx_buf + st->dma_st.buf_idx),  in at91_adc_trigger_handler_dma()
1093 				(st->dma_st.dma_ts + interval * sample_index));  in at91_adc_trigger_handler_dma()
1097 		st->dma_st.buf_idx += sample_size;  in at91_adc_trigger_handler_dma()
1099 		if (st->dma_st.buf_idx >= st->dma_st.rx_buf_sz)  in at91_adc_trigger_handler_dma()
1100 			st->dma_st.buf_idx = 0;  in at91_adc_trigger_handler_dma()
1104 	st->dma_st.dma_ts = iio_get_time_ns(indio_dev);  in at91_adc_trigger_handler_dma()
1113 	if (st->dma_st.dma_chan)  in at91_adc_trigger_handler()
1292 	} else if (iio_buffer_enabled(indio) && !st->dma_st.dma_chan) {  in at91_adc_interrupt()
1296 	} else if (iio_buffer_enabled(indio) && st->dma_st.dma_chan) {  in at91_adc_interrupt()
1472 	if (st->dma_st.dma_chan)  in at91_adc_dma_init()
1475 	st->dma_st.dma_chan = dma_request_slave_channel(&pdev->dev, "rx");  in at91_adc_dma_init()
1477 	if (!st->dma_st.dma_chan)  {  in at91_adc_dma_init()
1482 	st->dma_st.rx_buf = dma_alloc_coherent(st->dma_st.dma_chan->device->dev,  in at91_adc_dma_init()
1484 					       &st->dma_st.rx_dma_buf,  in at91_adc_dma_init()
1486 	if (!st->dma_st.rx_buf) {  in at91_adc_dma_init()
1493 	config.src_addr = (phys_addr_t)(st->dma_st.phys_addr  in at91_adc_dma_init()
1499 	if (dmaengine_slave_config(st->dma_st.dma_chan, &config)) {  in at91_adc_dma_init()
1505 		 dma_chan_name(st->dma_st.dma_chan));  in at91_adc_dma_init()
1510 	dma_free_coherent(st->dma_st.dma_chan->device->dev, pages * PAGE_SIZE,  in at91_adc_dma_init()
1511 			  st->dma_st.rx_buf, st->dma_st.rx_dma_buf);  in at91_adc_dma_init()
1513 	dma_release_channel(st->dma_st.dma_chan);  in at91_adc_dma_init()
1514 	st->dma_st.dma_chan = 0;  in at91_adc_dma_init()
1528 	if (!st->dma_st.dma_chan)  in at91_adc_dma_disable()
1532 	dmaengine_terminate_sync(st->dma_st.dma_chan);  in at91_adc_dma_disable()
1534 	dma_free_coherent(st->dma_st.dma_chan->device->dev, pages * PAGE_SIZE,  in at91_adc_dma_disable()
1535 			  st->dma_st.rx_buf, st->dma_st.rx_dma_buf);  in at91_adc_dma_disable()
1536 	dma_release_channel(st->dma_st.dma_chan);  in at91_adc_dma_disable()
1537 	st->dma_st.dma_chan = 0;  in at91_adc_dma_disable()
1555 	st->dma_st.watermark = val;  in at91_adc_set_watermark()
1613 	return scnprintf(buf, PAGE_SIZE, "%d\n", !!st->dma_st.dma_chan);  in at91_adc_get_fifo_state()
1623 	return scnprintf(buf, PAGE_SIZE, "%d\n", st->dma_st.watermark);  in at91_adc_get_watermark()
1751 	st->dma_st.phys_addr = res->start;  in at91_adc_probe()
1820 		st->dma_st.watermark = 1;  in at91_adc_probe()