107  * @master: SPI master
112 static int ep93xx_spi_calc_divisors(struct spi_master *master,  in ep93xx_spi_calc_divisors()  argument
115 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_calc_divisors()
123 	rate = clamp(rate, master->min_speed_hz, master->max_speed_hz);  in ep93xx_spi_calc_divisors()
146 static int ep93xx_spi_chip_setup(struct spi_master *master,  in ep93xx_spi_chip_setup()  argument
150 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_chip_setup()
157 	err = ep93xx_spi_calc_divisors(master, xfer->speed_hz,  in ep93xx_spi_chip_setup()
169 	dev_dbg(&master->dev, "setup: mode %d, cpsr %d, scr %d, dss %d\n",  in ep93xx_spi_chip_setup()
171 	dev_dbg(&master->dev, "setup: cr0 %#x\n", cr0);  in ep93xx_spi_chip_setup()
179 static void ep93xx_do_write(struct spi_master *master)  in ep93xx_do_write()  argument
181 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_do_write()
182 	struct spi_transfer *xfer = master->cur_msg->state;  in ep93xx_do_write()
197 static void ep93xx_do_read(struct spi_master *master)  in ep93xx_do_read()  argument
199 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_do_read()
200 	struct spi_transfer *xfer = master->cur_msg->state;  in ep93xx_do_read()
217  * @master: SPI master
226 static int ep93xx_spi_read_write(struct spi_master *master)  in ep93xx_spi_read_write()  argument
228 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_read_write()
229 	struct spi_transfer *xfer = master->cur_msg->state;  in ep93xx_spi_read_write()
233 		ep93xx_do_read(master);  in ep93xx_spi_read_write()
239 		ep93xx_do_write(master);  in ep93xx_spi_read_write()
264  * @master: SPI master
272 ep93xx_spi_dma_prepare(struct spi_master *master,  in ep93xx_spi_dma_prepare()  argument
275 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_dma_prepare()
276 	struct spi_transfer *xfer = master->cur_msg->state;  in ep93xx_spi_dma_prepare()
351 		dev_warn(&master->dev, "len = %zu expected 0!\n", len);  in ep93xx_spi_dma_prepare()
370  * @master: SPI master
376 static void ep93xx_spi_dma_finish(struct spi_master *master,  in ep93xx_spi_dma_finish()  argument
379 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_dma_finish()
396 	struct spi_master *master = callback_param;  in ep93xx_spi_dma_callback()  local
398 	ep93xx_spi_dma_finish(master, DMA_TO_DEVICE);  in ep93xx_spi_dma_callback()
399 	ep93xx_spi_dma_finish(master, DMA_FROM_DEVICE);  in ep93xx_spi_dma_callback()
401 	spi_finalize_current_transfer(master);  in ep93xx_spi_dma_callback()
404 static int ep93xx_spi_dma_transfer(struct spi_master *master)  in ep93xx_spi_dma_transfer()  argument
406 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_dma_transfer()
409 	rxd = ep93xx_spi_dma_prepare(master, DMA_FROM_DEVICE);  in ep93xx_spi_dma_transfer()
411 		dev_err(&master->dev, "DMA RX failed: %ld\n", PTR_ERR(rxd));  in ep93xx_spi_dma_transfer()
415 	txd = ep93xx_spi_dma_prepare(master, DMA_TO_DEVICE);  in ep93xx_spi_dma_transfer()
417 		ep93xx_spi_dma_finish(master, DMA_FROM_DEVICE);  in ep93xx_spi_dma_transfer()
418 		dev_err(&master->dev, "DMA TX failed: %ld\n", PTR_ERR(txd));  in ep93xx_spi_dma_transfer()
424 	rxd->callback_param = master;  in ep93xx_spi_dma_transfer()
439 	struct spi_master *master = dev_id;  in ep93xx_spi_interrupt()  local
440 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_interrupt()
450 		dev_warn(&master->dev,  in ep93xx_spi_interrupt()
452 		master->cur_msg->status = -EIO;  in ep93xx_spi_interrupt()
458 		if (ep93xx_spi_read_write(master)) {  in ep93xx_spi_interrupt()
477 	spi_finalize_current_transfer(master);  in ep93xx_spi_interrupt()
482 static int ep93xx_spi_transfer_one(struct spi_master *master,  in ep93xx_spi_transfer_one()  argument
486 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_transfer_one()
490 	ret = ep93xx_spi_chip_setup(master, spi, xfer);  in ep93xx_spi_transfer_one()
492 		dev_err(&master->dev, "failed to setup chip for transfer\n");  in ep93xx_spi_transfer_one()
496 	master->cur_msg->state = xfer;  in ep93xx_spi_transfer_one()
506 		return ep93xx_spi_dma_transfer(master);  in ep93xx_spi_transfer_one()
509 	ep93xx_spi_read_write(master);  in ep93xx_spi_transfer_one()
519 static int ep93xx_spi_prepare_message(struct spi_master *master,  in ep93xx_spi_prepare_message()  argument
522 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_prepare_message()
531 			dev_warn(&master->dev,  in ep93xx_spi_prepare_message()
547 static int ep93xx_spi_prepare_hardware(struct spi_master *master)  in ep93xx_spi_prepare_hardware()  argument
549 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_prepare_hardware()
564 static int ep93xx_spi_unprepare_hardware(struct spi_master *master)  in ep93xx_spi_unprepare_hardware()  argument
566 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_unprepare_hardware()
649 	struct spi_master *master;  in ep93xx_spi_probe()  local
672 	master = spi_alloc_master(&pdev->dev, sizeof(*espi));  in ep93xx_spi_probe()
673 	if (!master)  in ep93xx_spi_probe()
676 	master->use_gpio_descriptors = true;  in ep93xx_spi_probe()
677 	master->prepare_transfer_hardware = ep93xx_spi_prepare_hardware;  in ep93xx_spi_probe()
678 	master->unprepare_transfer_hardware = ep93xx_spi_unprepare_hardware;  in ep93xx_spi_probe()
679 	master->prepare_message = ep93xx_spi_prepare_message;  in ep93xx_spi_probe()
680 	master->transfer_one = ep93xx_spi_transfer_one;  in ep93xx_spi_probe()
681 	master->bus_num = pdev->id;  in ep93xx_spi_probe()
682 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;  in ep93xx_spi_probe()
683 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);  in ep93xx_spi_probe()
688 	master->num_chipselect = 0;  in ep93xx_spi_probe()
690 	platform_set_drvdata(pdev, master);  in ep93xx_spi_probe()
692 	espi = spi_master_get_devdata(master);  in ep93xx_spi_probe()
705 	master->max_speed_hz = clk_get_rate(espi->clk) / 2;  in ep93xx_spi_probe()
706 	master->min_speed_hz = clk_get_rate(espi->clk) / (254 * 256);  in ep93xx_spi_probe()
717 				0, "ep93xx-spi", master);  in ep93xx_spi_probe()
729 	error = devm_spi_register_master(&pdev->dev, master);  in ep93xx_spi_probe()
731 		dev_err(&pdev->dev, "failed to register SPI master\n");  in ep93xx_spi_probe()
743 	spi_master_put(master);  in ep93xx_spi_probe()
750 	struct spi_master *master = platform_get_drvdata(pdev);  in ep93xx_spi_remove()  local
751 	struct ep93xx_spi *espi = spi_master_get_devdata(master);  in ep93xx_spi_remove()