224  * @transfer_one_dma_start: routine to start transfer a single spi_transfer
274  * @cur_xferlen: current transfer length in bytes
275  * @cur_usedma: boolean to know if dma is used in current transfer
280  * @dma_tx: dma channel for TX transfer
281  * @dma_rx: dma channel for RX transfer
328 	/* SPI data transfer is enabled but spi_ker_ck is idle.
716  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
719  * @transfer: pointer to spi transfer
721  * If driver has fifo and the current transfer size is greater than fifo size,
722  * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes.
726 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
737 		(transfer->len > dma_size) ? "true" : "false");  in stm32_spi_can_dma()
739 	return (transfer->len > dma_size);  in stm32_spi_can_dma()
793 		 * so stop the current transfer. Transfer can wait for next  in stm32f4_spi_irq_event()
896 		 * that something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
903 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32h7_spi_irq_thread()
941  * stm32_spi_prepare_msg - set up the controller to transfer a single message
1012  * DMA callback is called when the transfer is complete for DMA TX channel.
1028  * DMA callback is called when the transfer is complete for DMA RX channel.
1040  *			  transfer bits_per_word.
1043  * @dir: direction of the dma transfer
1089  * stm32f4_spi_transfer_one_irq - transfer a single spi_transfer using
1093  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1122 	/* starting data transfer when buffer is loaded */  in stm32f4_spi_transfer_one_irq()
1132  * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using
1136  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1152 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_irq()
1160 	/* Be sure to have data in fifo before starting data transfer */  in stm32h7_spi_transfer_one_irq()
1175  *					transfer using DMA
1180 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */  in stm32f4_spi_transfer_one_dma_start()
1196  *					transfer using DMA
1215  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
1219  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1313 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
1375  * stm32_spi_communication_type - return transfer communication type
1377  * @transfer: pointer to spi transfer
1380 						 struct spi_transfer *transfer)  in stm32_spi_communication_type()  argument
1389 		 * transfer.  in stm32_spi_communication_type()
1391 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1396 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1398 		else if (!transfer->rx_buf)  in stm32_spi_communication_type()
1472  * @len: transfer len
1498  * stm32h7_spi_number_of_data - configure number of data at current transfer
1500  * @nb_words: transfer length (in words)
1515  * stm32_spi_transfer_one_setup - common setup to transfer a single
1520  * @transfer: pointer to spi transfer
1524 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
1533 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
1535 	spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
1539 	mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,  in stm32_spi_transfer_one_setup()
1547 	transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
1550 	comm_type = stm32_spi_communication_type(spi_dev, transfer);  in stm32_spi_transfer_one_setup()
1558 		spi->cfg->set_data_idleness(spi, transfer->len);  in stm32_spi_transfer_one_setup()
1561 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
1563 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
1565 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
1573 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
1579 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
1591  * stm32_spi_transfer_one - transfer a single spi_transfer
1594  * @transfer: pointer to spi transfer
1596  * It must return 0 if the transfer is finished or 1 if the transfer is still
1601 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
1606 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
1607 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
1608 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1609 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1612 			   master->can_dma(master, spi_dev, transfer));  in stm32_spi_transfer_one()
1614 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
1616 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
1621 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()