141  * @cur_xferlen: current transfer length in bytes
142  * @cur_usedma: boolean to know if dma is used in current transfer
147  * @dma_tx: dma channel for TX transfer
148  * @dma_rx: dma channel for RX transfer
391  * SPI data transfer is enabled but spi_ker_ck is idle.
462  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
464  * If the current transfer size is greater than fifo size, use DMA.
468 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
473 		(transfer->len > spi->fifo_size) ? "true" : "false");  in stm32_spi_can_dma()
475 	return (transfer->len > spi->fifo_size);  in stm32_spi_can_dma()
520 		 * that something went wrong, so stop the current transfer  in stm32_spi_irq()
527 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32_spi_irq()
537 		 * something went wrong, so stop the current transfer  in stm32_spi_irq()
593  * stm32_spi_prepare_msg - set up the controller to transfer a single message
646  * DMA callback is called when the transfer is complete or when an error
647  * occurs. If the transfer is complete, EOT flag is raised.
669  *			  transfer bits_per_word.
711  * stm32_spi_transfer_one_irq - transfer a single spi_transfer using
714  * It must returns 0 if the transfer is finished or 1 if the transfer is still
730 	/* Enable the interrupts relative to the end of transfer */  in stm32_spi_transfer_one_irq()
737 	/* Be sure to have data in fifo before starting data transfer */  in stm32_spi_transfer_one_irq()
751  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
753  * It must returns 0 if the transfer is finished or 1 if the transfer is still
826 	/* Enable the interrupts relative to the end of transfer */  in stm32_spi_transfer_one_dma()
847 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
853  * stm32_spi_transfer_one_setup - common setup to transfer a single
859 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
868 	if (spi->cur_bpw != transfer->bits_per_word) {  in stm32_spi_transfer_one_setup()
871 		spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
884 	if (spi->cur_speed != transfer->speed_hz) {  in stm32_spi_transfer_one_setup()
888 		mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz);  in stm32_spi_transfer_one_setup()
894 		transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
911 		 * transfer.  in stm32_spi_transfer_one_setup()
914 		if (!transfer->tx_buf)  in stm32_spi_transfer_one_setup()
916 		else if (!transfer->rx_buf)  in stm32_spi_transfer_one_setup()
919 		if (!transfer->tx_buf)  in stm32_spi_transfer_one_setup()
921 		else if (!transfer->rx_buf)  in stm32_spi_transfer_one_setup()
932 	if ((transfer->len > 1) && (spi->cur_midi > 0)) {  in stm32_spi_transfer_one_setup()
949 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
951 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
953 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
963 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
965 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
971 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
983  * stm32_spi_transfer_one - transfer a single spi_transfer
985  * It must return 0 if the transfer is finished or 1 if the transfer is still
990 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
995 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
996 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
997 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
998 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1001 			   stm32_spi_can_dma(master, spi_dev, transfer));  in stm32_spi_transfer_one()
1003 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
1005 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
1010 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()
1021  * complete the transfer from an hardware point of view.