257  * @transfer_one_dma_start: routine to start transfer a single spi_transfer
308  * @t_size_max: maximum number of data of one transfer
316  * @cur_xferlen: current transfer length in bytes
317  * @cur_usedma: boolean to know if dma is used in current transfer
322  * @dma_tx: dma channel for TX transfer
323  * @dma_rx: dma channel for RX transfer
379 	/* SPI data transfer is enabled but spi_ker_ck is idle.
399 	/* SPI data transfer is enabled but spi_ker_ck is idle.
897  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
900  * @transfer: pointer to spi transfer
902  * If driver has fifo and the current transfer size is greater than fifo size,
903  * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes.
907 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
918 		(transfer->len > dma_size) ? "true" : "false");  in stm32_spi_can_dma()
920 	return (transfer->len > dma_size);  in stm32_spi_can_dma()
974 		 * so stop the current transfer. Transfer can wait for next  in stm32fx_spi_irq_event()
1077 		 * that something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
1084 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32h7_spi_irq_thread()
1122  * stm32_spi_prepare_msg - set up the controller to transfer a single message
1198  * DMA callback is called when the transfer is complete for DMA TX channel.
1214  * DMA callback is called when the transfer is complete for DMA RX channel.
1226  *			  transfer bits_per_word.
1230  * @dir: direction of the dma transfer
1278  * stm32fx_spi_transfer_one_irq - transfer a single spi_transfer using
1282  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1311 	/* starting data transfer when buffer is loaded */  in stm32fx_spi_transfer_one_irq()
1321  * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using
1325  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1341 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_irq()
1349 	/* Be sure to have data in fifo before starting data transfer */  in stm32h7_spi_transfer_one_irq()
1365  *					transfer using DMA
1370 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */  in stm32fx_spi_transfer_one_dma_start()
1386  *					transfer using DMA
1402  *					transfer using DMA
1422  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
1426  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1520 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
1607  * stm32_spi_communication_type - return transfer communication type
1609  * @transfer: pointer to spi transfer
1612 						 struct spi_transfer *transfer)  in stm32_spi_communication_type()  argument
1621 		 * transfer.  in stm32_spi_communication_type()
1623 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1628 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1630 		else if (!transfer->rx_buf)  in stm32_spi_communication_type()
1704  * @len: transfer len
1730  * stm32h7_spi_number_of_data - configure number of data at current transfer
1732  * @nb_words: transfer length (in words)
1747  * stm32_spi_transfer_one_setup - common setup to transfer a single
1752  * @transfer: pointer to spi transfer
1756 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
1765 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
1767 	spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
1772 		mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,  in stm32_spi_transfer_one_setup()
1780 		transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
1784 	comm_type = stm32_spi_communication_type(spi_dev, transfer);  in stm32_spi_transfer_one_setup()
1792 		spi->cfg->set_data_idleness(spi, transfer->len);  in stm32_spi_transfer_one_setup()
1795 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
1797 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
1799 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
1807 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
1814 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
1826  * stm32_spi_transfer_one - transfer a single spi_transfer
1829  * @transfer: pointer to spi transfer
1831  * It must return 0 if the transfer is finished or 1 if the transfer is still
1836 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
1841 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
1842 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
1843 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1844 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
1847 			   ctrl->can_dma(ctrl, spi_dev, transfer));  in stm32_spi_transfer_one()
1849 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
1851 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
1856 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()