264  * @transfer_one_dma_start: routine to start transfer a single spi_transfer
315  * @t_size_max: maximum number of data of one transfer
323  * @cur_xferlen: current transfer length in bytes
324  * @cur_usedma: boolean to know if dma is used in current transfer
329  * @dma_tx: dma channel for TX transfer
330  * @dma_rx: dma channel for RX transfer
334  * @sram_rx_buf_size: size of SRAM buffer for RX transfer
335  * @sram_rx_buf: SRAM buffer for RX transfer
336  * @sram_dma_rx_buf: SRAM buffer physical address for RX transfer
337  * @mdma_rx: MDMA channel for RX transfer
397 	/* SPI data transfer is enabled but spi_ker_ck is idle.
417 	/* SPI data transfer is enabled but spi_ker_ck is idle.
920  * stm32_spi_can_dma - Determine if the transfer is eligible for DMA use
923  * @transfer: pointer to spi transfer
925  * If driver has fifo and the current transfer size is greater than fifo size,
926  * use DMA. Otherwise use DMA for transfer longer than defined DMA min bytes.
930 			      struct spi_transfer *transfer)  in stm32_spi_can_dma()  argument
941 		(transfer->len > dma_size) ? "true" : "false");  in stm32_spi_can_dma()
943 	return (transfer->len > dma_size);  in stm32_spi_can_dma()
997 		 * so stop the current transfer. Transfer can wait for next  in stm32fx_spi_irq_event()
1100 		 * that something went wrong, so stop the current transfer  in stm32h7_spi_irq_thread()
1107 		dev_warn(spi->dev, "Mode fault: transfer aborted\n");  in stm32h7_spi_irq_thread()
1117 		dev_dbg(spi->dev, "End of transfer\n");  in stm32h7_spi_irq_thread()
1168  * stm32_spi_prepare_msg - set up the controller to transfer a single message
1236  * DMA callback is called when the transfer is complete for DMA TX channel.
1252  * DMA callback is called when the transfer is complete for DMA RX channel.
1264  *			  transfer bits_per_word.
1268  * @dir: direction of the dma transfer
1316  * stm32fx_spi_transfer_one_irq - transfer a single spi_transfer using
1320  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1349 	/* starting data transfer when buffer is loaded */  in stm32fx_spi_transfer_one_irq()
1359  * stm32h7_spi_transfer_one_irq - transfer a single spi_transfer using
1363  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1379 	/* Enable the interrupts relative to the end of transfer */  in stm32h7_spi_transfer_one_irq()
1387 	/* Be sure to have data in fifo before starting data transfer */  in stm32h7_spi_transfer_one_irq()
1403  *					transfer using DMA
1408 	/* In DMA mode end of transfer is handled by DMA TX or RX callback. */  in stm32fx_spi_transfer_one_dma_start()
1424  *					transfer using DMA
1440  *					transfer using DMA
1464  * @xfer: pointer to the spi transfer
1502 	/* Prepare DMA slave_sg DBM transfer DEV_TO_MEM (RX>MEM=SRAM) */  in stm32_spi_prepare_rx_dma_mdma_chaining()
1537 	/* Prepare MDMA slave_sg transfer MEM_TO_MEM (SRAM>DDR) */  in stm32_spi_prepare_rx_dma_mdma_chaining()
1577  * stm32_spi_transfer_one_dma - transfer a single spi_transfer using DMA
1581  * It must returns 0 if the transfer is finished or 1 if the transfer is still
1698 	dev_info(spi->dev, "DMA issue: fall back to irq transfer\n");  in stm32_spi_transfer_one_dma()
1788  * stm32_spi_communication_type - return transfer communication type
1790  * @transfer: pointer to spi transfer
1793 						 struct spi_transfer *transfer)  in stm32_spi_communication_type()  argument
1802 		 * transfer.  in stm32_spi_communication_type()
1804 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1809 		if (!transfer->tx_buf)  in stm32_spi_communication_type()
1811 		else if (!transfer->rx_buf)  in stm32_spi_communication_type()
1885  * @xfer: pointer to spi transfer
1926  * stm32h7_spi_number_of_data - configure number of data at current transfer
1928  * @nb_words: transfer length (in words)
1943  * stm32_spi_transfer_one_setup - common setup to transfer a single
1948  * @transfer: pointer to spi transfer
1952 					struct spi_transfer *transfer)  in stm32_spi_transfer_one_setup()  argument
1961 	spi->cur_xferlen = transfer->len;  in stm32_spi_transfer_one_setup()
1963 	spi->cur_bpw = transfer->bits_per_word;  in stm32_spi_transfer_one_setup()
1975 		mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,  in stm32_spi_transfer_one_setup()
1983 		transfer->speed_hz = spi->cur_speed;  in stm32_spi_transfer_one_setup()
1987 	comm_type = stm32_spi_communication_type(spi_dev, transfer);  in stm32_spi_transfer_one_setup()
1995 		spi->cfg->set_data_idleness(spi, transfer);  in stm32_spi_transfer_one_setup()
1998 		nb_words = transfer->len;  in stm32_spi_transfer_one_setup()
2000 		nb_words = DIV_ROUND_UP(transfer->len * 8, 16);  in stm32_spi_transfer_one_setup()
2002 		nb_words = DIV_ROUND_UP(transfer->len * 8, 32);  in stm32_spi_transfer_one_setup()
2010 	dev_dbg(spi->dev, "transfer communication mode set to %d\n",  in stm32_spi_transfer_one_setup()
2017 	dev_dbg(spi->dev, "transfer of %d bytes (%d data frames)\n",  in stm32_spi_transfer_one_setup()
2029  * stm32_spi_transfer_one - transfer a single spi_transfer
2032  * @transfer: pointer to spi transfer
2034  * It must return 0 if the transfer is finished or 1 if the transfer is still
2039 				  struct spi_transfer *transfer)  in stm32_spi_transfer_one()  argument
2044 	spi->tx_buf = transfer->tx_buf;  in stm32_spi_transfer_one()
2045 	spi->rx_buf = transfer->rx_buf;  in stm32_spi_transfer_one()
2046 	spi->tx_len = spi->tx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
2047 	spi->rx_len = spi->rx_buf ? transfer->len : 0;  in stm32_spi_transfer_one()
2050 			   ctrl->can_dma(ctrl, spi_dev, transfer));  in stm32_spi_transfer_one()
2052 	ret = stm32_spi_transfer_one_setup(spi, spi_dev, transfer);  in stm32_spi_transfer_one()
2054 		dev_err(spi->dev, "SPI transfer setup failed\n");  in stm32_spi_transfer_one()
2059 		return stm32_spi_transfer_one_dma(spi, transfer);  in stm32_spi_transfer_one()