229  * @can_dma: routine to determine if the transfer is eligible for DMA use
230  * @transfer_one_dma_start: routine to start transfer a single spi_transfer
240  * @has_startbit: boolean to know if start bit is used to start transfer
280  * @cur_xferlen: current transfer length in bytes
281  * @cur_usedma: boolean to know if dma is used in current transfer
286  * @dma_tx: dma channel for TX transfer
287  * @dma_rx: dma channel for RX transfer
335 	/* SPI data transfer is enabled but spi_ker_ck is idle.
704  * complete the transfer from an hardware point of view.
759  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
761  * If driver has fifo and the current transfer size is greater than fifo size,
762  * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes.
766 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
777 		(transfer->len > dma_size) ? "true" : "false");  in stm32_spi_can_dma()
779 	return (transfer->len > dma_size);  in stm32_spi_can_dma()
832 		 * so stop the current transfer. Transfer can wait for next  in stm32f4_spi_irq_event()
927 		 * that something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
934 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32h7_spi_irq_thread()
944 		 * something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
1000  * stm32_spi_prepare_msg - set up the controller to transfer a single message
1054  * DMA callback is called when the transfer is complete for DMA TX channel.
1069  * DMA callback is called when the transfer is complete for DMA RX channel.
1082  * DMA callback is called when the transfer is complete or when an error
1083  * occurs. If the transfer is complete, EOT flag is raised.
1105  *			  transfer bits_per_word.
1151  * stm32f4_spi_transfer_one_irq - transfer a single spi_transfer using
1154  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1181 	/* starting data transfer when buffer is loaded */  in stm32f4_spi_transfer_one_irq()
1191  * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using
1194  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1210 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_irq()
1218 	/* Be sure to have data in fifo before starting data transfer */  in stm32h7_spi_transfer_one_irq()
1233  *					transfer using DMA
1237 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */  in stm32f4_spi_transfer_one_dma_start()
1253  *					transfer using DMA
1257 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_dma_start()
1269  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
1271  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1365 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
1430  * stm32_spi_communication_type - return transfer communication type
1432  * transfer: pointer to spi transfer
1435 						 struct spi_transfer *transfer)  in stm32_spi_communication_type()  argument
1444 		 * transfer.  in stm32_spi_communication_type()
1446 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1451 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1453 		else if (!transfer->rx_buf)  in stm32_spi_communication_type()
1522  * @len: transfer len
1547  * stm32h7_spi_number_of_data - configure number of data at current transfer
1549  * @len: transfer length
1570  * stm32_spi_transfer_one_setup - common setup to transfer a single
1576 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
1584 	if (spi->cur_bpw != transfer->bits_per_word) {  in stm32_spi_transfer_one_setup()
1585 		spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
1589 	if (spi->cur_speed != transfer->speed_hz) {  in stm32_spi_transfer_one_setup()
1593 		mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,  in stm32_spi_transfer_one_setup()
1601 		transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
1605 	comm_type = stm32_spi_communication_type(spi_dev, transfer);  in stm32_spi_transfer_one_setup()
1616 		spi->cfg->set_data_idleness(spi, transfer->len);  in stm32_spi_transfer_one_setup()
1619 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
1621 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
1623 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
1631 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
1633 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
1639 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
1651  * stm32_spi_transfer_one - transfer a single spi_transfer
1653  * It must return 0 if the transfer is finished or 1 if the transfer is still
1658 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
1663 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
1664 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
1665 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1666 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1669 			   master->can_dma(master, spi_dev, transfer));  in stm32_spi_transfer_one()
1671 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
1673 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
1678 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()