drivers/spi/spi-orion.c

14 #include <linux/spi/spi.h>
73 	 * have both is for managing the armada-370-spi case with old
135 static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
144 	orion_spi = spi_controller_get_devdata(spi->controller);
233 orion_spi_mode_set(struct spi_device *spi)
238 	orion_spi = spi_controller_get_devdata(spi->controller);
242 	if (spi->mode & SPI_CPOL)
244 	if (spi->mode & SPI_CPHA)
246 	if (spi->mode & SPI_LSB_FIRST)
255 orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed)
260 	orion_spi = spi_controller_get_devdata(spi->controller);
280 			speed == 50000000 && spi->mode & SPI_CPOL &&
281 			spi->mode & SPI_CPHA)
293 orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
296 	unsigned int speed = spi->max_speed_hz;
297 	unsigned int bits_per_word = spi->bits_per_word;
300 	orion_spi = spi_controller_get_devdata(spi->controller);
308 	orion_spi_mode_set(spi);
311 		orion_spi_50mhz_ac_timing_erratum(spi, speed);
313 	rc = orion_spi_baudrate_set(spi, speed);
327 static void orion_spi_set_cs(struct spi_device *spi, bool enable)
333 	orion_spi = spi_controller_get_devdata(spi->controller);
348 	val |= ORION_SPI_CS(spi_get_chipselect(spi, 0));
382 orion_spi_write_read_8bit(struct spi_device *spi,
389 	cs_single_byte = spi->mode & SPI_CS_WORD;
391 	orion_spi = spi_controller_get_devdata(spi->controller);
394 		orion_spi_set_cs(spi, 0);
410 			orion_spi_set_cs(spi, 1);
414 		dev_err(&spi->dev, "TXS timed out\n");
422 		orion_spi_set_cs(spi, 1);
431 orion_spi_write_read_16bit(struct spi_device *spi,
437 	if (spi->mode & SPI_CS_WORD) {
438 		dev_err(&spi->dev, "SPI_CS_WORD is only supported for 8 bit words\n");
442 	orion_spi = spi_controller_get_devdata(spi->controller);
456 		dev_err(&spi->dev, "TXS timed out\n");
467 orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
472 	int cs = spi_get_chipselect(spi, 0);
475 	word_len = spi->bits_per_word;
478 	orion_spi = spi_controller_get_devdata(spi->controller);
487 	if (vaddr && xfer->tx_buf && word_len == 8 && (spi->mode & SPI_CS_WORD) == 0) {
510 			if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0)
520 			if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0)
532 					struct spi_device *spi,
537 	status = orion_spi_setup_transfer(spi, t);
542 		orion_spi_write_read(spi, t);
547 static int orion_spi_setup(struct spi_device *spi)
551 	struct orion_spi *orion_spi = spi_controller_get_devdata(spi->controller);
557 	ret = orion_spi_setup_transfer(spi, NULL);
616 		.compatible = "marvell,orion-spi",
620 		.compatible = "marvell,armada-370-spi",
624 		.compatible = "marvell,armada-375-spi",
628 		.compatible = "marvell,armada-380-spi",
632 		.compatible = "marvell,armada-390-spi",
636 		.compatible = "marvell,armada-xp-spi",
648 	struct orion_spi *spi;
654 	host = spi_alloc_host(&pdev->dev, sizeof(*spi));
683 	spi = spi_controller_get_devdata(host);
684 	spi->host = host;
685 	spi->dev = &pdev->dev;
689 	spi->devdata = devdata;
691 	spi->clk = devm_clk_get_enabled(&pdev->dev, NULL);
692 	if (IS_ERR(spi->clk)) {
693 		status = PTR_ERR(spi->clk);
698 	spi->axi_clk = devm_clk_get(&pdev->dev, "axi");
699 	if (PTR_ERR(spi->axi_clk) == -EPROBE_DEFER) {
703 	if (!IS_ERR(spi->axi_clk))
704 		clk_prepare_enable(spi->axi_clk);
706 	tclk_hz = clk_get_rate(spi->clk);
709 	 * With old device tree, armada-370-spi could be used with
716 					"marvell,armada-370-spi"))
726 	spi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
727 	if (IS_ERR(spi->base)) {
728 		status = PTR_ERR(spi->base);
762 		dir_acc = &spi->child[cs].direct_access;
779 	status = orion_spi_reset(spi);
793 	clk_disable_unprepare(spi->axi_clk);
803 	struct orion_spi *spi = spi_controller_get_devdata(host);
806 	clk_disable_unprepare(spi->axi_clk);
818 	struct orion_spi *spi = spi_controller_get_devdata(host);
820 	clk_disable_unprepare(spi->axi_clk);
821 	clk_disable_unprepare(spi->clk);
828 	struct orion_spi *spi = spi_controller_get_devdata(host);
830 	if (!IS_ERR(spi->axi_clk))
831 		clk_prepare_enable(spi->axi_clk);
832 	return clk_prepare_enable(spi->clk);