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.
481 	/* data_packet should not exceed transfer length */  in stm32h7_spi_prepare_fthlv()
716  * complete the transfer from an hardware point of view.
771  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
774  * @transfer: pointer to spi transfer
776  * If driver has fifo and the current transfer size is greater than fifo size,
777  * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes.
781 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
792 		(transfer->len > dma_size) ? "true" : "false");  in stm32_spi_can_dma()
794 	return (transfer->len > dma_size);  in stm32_spi_can_dma()
848 		 * so stop the current transfer. Transfer can wait for next  in stm32f4_spi_irq_event()
947 		 * that something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
954 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32h7_spi_irq_thread()
964 		 * something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
997  * 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.
1070  * DMA callback is called when the transfer is complete for DMA RX channel.
1084  * DMA callback is called when the transfer is complete or when an error
1085  * occurs. If the transfer is complete, EOT flag is raised.
1107  *			  transfer bits_per_word.
1110  * @dir: direction of the dma transfer
1156  * stm32f4_spi_transfer_one_irq - transfer a single spi_transfer using
1160  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1189 	/* starting data transfer when buffer is loaded */  in stm32f4_spi_transfer_one_irq()
1199  * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using
1203  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1219 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_irq()
1227 	/* Be sure to have data in fifo before starting data transfer */  in stm32h7_spi_transfer_one_irq()
1242  *					transfer using DMA
1247 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */  in stm32f4_spi_transfer_one_dma_start()
1263  *					transfer using DMA
1268 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_dma_start()
1280  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
1284  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1378 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
1443  * stm32_spi_communication_type - return transfer communication type
1445  * @transfer: pointer to spi transfer
1448 						 struct spi_transfer *transfer)  in stm32_spi_communication_type()  argument
1457 		 * transfer.  in stm32_spi_communication_type()
1459 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1464 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1466 		else if (!transfer->rx_buf)  in stm32_spi_communication_type()
1541  * @len: transfer len
1566  * stm32h7_spi_number_of_data - configure number of data at current transfer
1568  * @nb_words: transfer length (in words)
1589  * stm32_spi_transfer_one_setup - common setup to transfer a single
1594  * @transfer: pointer to spi transfer
1598 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
1607 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
1609 	spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
1613 	mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,  in stm32_spi_transfer_one_setup()
1621 	transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
1624 	comm_type = stm32_spi_communication_type(spi_dev, transfer);  in stm32_spi_transfer_one_setup()
1632 		spi->cfg->set_data_idleness(spi, transfer->len);  in stm32_spi_transfer_one_setup()
1635 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
1637 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
1639 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
1647 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
1653 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
1665  * stm32_spi_transfer_one - transfer a single spi_transfer
1668  * @transfer: pointer to spi transfer
1670  * It must return 0 if the transfer is finished or 1 if the transfer is still
1675 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
1680 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
1681 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
1682 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1683 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1686 			   master->can_dma(master, spi_dev, transfer));  in stm32_spi_transfer_one()
1688 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
1690 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
1695 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()