1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright (C) 2007-2008 Marvell Ltd.
30  * It is up to the implementer to only use the chip selects
74 	 * have both is for managing the armada-370-spi case with old
111 	return orion_spi->base + reg;  in spi_reg()
145 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_baudrate_set()
146 	devdata = orion_spi->devdata;  in orion_spi_baudrate_set()
148 	tclk_hz = clk_get_rate(orion_spi->clk);  in orion_spi_baudrate_set()
150 	if (devdata->typ == ARMADA_SPI) {  in orion_spi_baudrate_set()
161 		/* best integer divider: */  in orion_spi_baudrate_set()
162 		unsigned divider = DIV_ROUND_UP(tclk_hz, speed);  in orion_spi_baudrate_set()  local
165 		if (divider < 16) {  in orion_spi_baudrate_set()
166 			/* This is the easy case, divider is less than 16 */  in orion_spi_baudrate_set()
167 			spr = divider;  in orion_spi_baudrate_set()
173 			 * Find the highest bit set in divider. This and the  in orion_spi_baudrate_set()
178 			sppr = fls(divider) - 4;  in orion_spi_baudrate_set()
181 			 * As SPR only has 4 bits, we have to round divider up  in orion_spi_baudrate_set()
185 			divider = (divider + two_pow_sppr - 1) & -two_pow_sppr;  in orion_spi_baudrate_set()
188 			 * recalculate sppr as rounding up divider might have  in orion_spi_baudrate_set()
194 			sppr = fls(divider) - 4;  in orion_spi_baudrate_set()
195 			spr = divider >> sppr;  in orion_spi_baudrate_set()
203 				return -EINVAL;  in orion_spi_baudrate_set()
217 			return -EINVAL;  in orion_spi_baudrate_set()
227 	reg = ((reg & ~devdata->prescale_mask) | prescale);  in orion_spi_baudrate_set()
239 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_mode_set()
243 	if (spi->mode & SPI_CPOL)  in orion_spi_mode_set()
245 	if (spi->mode & SPI_CPHA)  in orion_spi_mode_set()
247 	if (spi->mode & SPI_LSB_FIRST)  in orion_spi_mode_set()
261 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_50mhz_ac_timing_erratum()
264 	 * Erratum description: (Erratum NO. FE-9144572) The device  in orion_spi_50mhz_ac_timing_erratum()
280 	if (clk_get_rate(orion_spi->clk) == 250000000 &&  in orion_spi_50mhz_ac_timing_erratum()
281 			speed == 50000000 && spi->mode & SPI_CPOL &&  in orion_spi_50mhz_ac_timing_erratum()
282 			spi->mode & SPI_CPHA)  in orion_spi_50mhz_ac_timing_erratum()
297 	unsigned int speed = spi->max_speed_hz;  in orion_spi_setup_transfer()
298 	unsigned int bits_per_word = spi->bits_per_word;  in orion_spi_setup_transfer()
301 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_setup_transfer()
303 	if ((t != NULL) && t->speed_hz)  in orion_spi_setup_transfer()
304 		speed = t->speed_hz;  in orion_spi_setup_transfer()
306 	if ((t != NULL) && t->bits_per_word)  in orion_spi_setup_transfer()
307 		bits_per_word = t->bits_per_word;  in orion_spi_setup_transfer()
311 	if (orion_spi->devdata->is_errata_50mhz_ac)  in orion_spi_setup_transfer()
334 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_set_cs()
339 	/* Clear existing chip-select and assertion state */  in orion_spi_set_cs()
343 	 * If this line is using a GPIO to control chip select, this internal  in orion_spi_set_cs()
349 	val |= ORION_SPI_CS(spi->chip_select);  in orion_spi_set_cs()
379 	return -1;  in orion_spi_wait_till_ready()
390 	cs_single_byte = spi->mode & SPI_CS_WORD;  in orion_spi_write_read_8bit()
392 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_write_read_8bit()
415 		dev_err(&spi->dev, "TXS timed out\n");  in orion_spi_write_read_8bit()
416 		return -1;  in orion_spi_write_read_8bit()
438 	if (spi->mode & SPI_CS_WORD) {  in orion_spi_write_read_16bit()
439 		dev_err(&spi->dev, "SPI_CS_WORD is only supported for 8 bit words\n");  in orion_spi_write_read_16bit()
440 		return -1;  in orion_spi_write_read_16bit()
443 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_write_read_16bit()
457 		dev_err(&spi->dev, "TXS timed out\n");  in orion_spi_write_read_16bit()
458 		return -1;  in orion_spi_write_read_16bit()
473 	int cs = spi->chip_select;  in orion_spi_write_read()
476 	word_len = spi->bits_per_word;  in orion_spi_write_read()
477 	count = xfer->len;  in orion_spi_write_read()
479 	orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_write_read()
482 	 * Use SPI direct write mode if base address is available  in orion_spi_write_read()
486 	vaddr = orion_spi->child[cs].direct_access.vaddr;  in orion_spi_write_read()
488 	if (vaddr && xfer->tx_buf && word_len == 8 && (spi->mode & SPI_CS_WORD) == 0) {  in orion_spi_write_read()
493 		 * Send the TX-data to the SPI device via the direct  in orion_spi_write_read()
496 		iowrite32_rep(vaddr, xfer->tx_buf, cnt);  in orion_spi_write_read()
498 			u32 *buf = (u32 *)xfer->tx_buf;  in orion_spi_write_read()
507 		const u8 *tx = xfer->tx_buf;  in orion_spi_write_read()
508 		u8 *rx = xfer->rx_buf;  in orion_spi_write_read()
513 			count--;  in orion_spi_write_read()
514 			spi_delay_exec(&xfer->word_delay, xfer);  in orion_spi_write_read()
517 		const u16 *tx = xfer->tx_buf;  in orion_spi_write_read()
518 		u16 *rx = xfer->rx_buf;  in orion_spi_write_read()
523 			count -= 2;  in orion_spi_write_read()
524 			spi_delay_exec(&xfer->word_delay, xfer);  in orion_spi_write_read()
529 	return xfer->len - count;  in orion_spi_write_read()
542 	if (t->len)  in orion_spi_transfer_one()
552 	struct orion_spi *orion_spi = spi_master_get_devdata(spi->master);  in orion_spi_setup()
553 	struct device *dev = orion_spi->dev;  in orion_spi_setup()
617 		.compatible = "marvell,orion-spi",
621 		.compatible = "marvell,armada-370-spi",
625 		.compatible = "marvell,armada-375-spi",
629 		.compatible = "marvell,armada-380-spi",
633 		.compatible = "marvell,armada-390-spi",
637 		.compatible = "marvell,armada-xp-spi",
655 	master = spi_alloc_master(&pdev->dev, sizeof(*spi));  in orion_spi_probe()
657 		dev_dbg(&pdev->dev, "master allocation failed\n");  in orion_spi_probe()
658 		return -ENOMEM;  in orion_spi_probe()
661 	if (pdev->id != -1)  in orion_spi_probe()
662 		master->bus_num = pdev->id;  in orion_spi_probe()
663 	if (pdev->dev.of_node) {  in orion_spi_probe()
666 		if (!of_property_read_u32(pdev->dev.of_node, "cell-index",  in orion_spi_probe()
668 			master->bus_num = cell_index;  in orion_spi_probe()
672 	master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST | SPI_CS_WORD;  in orion_spi_probe()
673 	master->set_cs = orion_spi_set_cs;  in orion_spi_probe()
674 	master->transfer_one = orion_spi_transfer_one;  in orion_spi_probe()
675 	master->num_chipselect = ORION_NUM_CHIPSELECTS;  in orion_spi_probe()
676 	master->setup = orion_spi_setup;  in orion_spi_probe()
677 	master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);  in orion_spi_probe()
678 	master->auto_runtime_pm = true;  in orion_spi_probe()
679 	master->use_gpio_descriptors = true;  in orion_spi_probe()
680 	master->flags = SPI_MASTER_GPIO_SS;  in orion_spi_probe()
685 	spi->master = master;  in orion_spi_probe()
686 	spi->dev = &pdev->dev;  in orion_spi_probe()
688 	devdata = device_get_match_data(&pdev->dev);  in orion_spi_probe()
690 	spi->devdata = devdata;  in orion_spi_probe()
692 	spi->clk = devm_clk_get(&pdev->dev, NULL);  in orion_spi_probe()
693 	if (IS_ERR(spi->clk)) {  in orion_spi_probe()
694 		status = PTR_ERR(spi->clk);  in orion_spi_probe()
698 	status = clk_prepare_enable(spi->clk);  in orion_spi_probe()
703 	spi->axi_clk = devm_clk_get(&pdev->dev, "axi");  in orion_spi_probe()
704 	if (PTR_ERR(spi->axi_clk) == -EPROBE_DEFER) {  in orion_spi_probe()
705 		status = -EPROBE_DEFER;  in orion_spi_probe()
708 	if (!IS_ERR(spi->axi_clk))  in orion_spi_probe()
709 		clk_prepare_enable(spi->axi_clk);  in orion_spi_probe()
711 	tclk_hz = clk_get_rate(spi->clk);  in orion_spi_probe()
714 	 * With old device tree, armada-370-spi could be used with  in orion_spi_probe()
720 	if (of_device_is_compatible(pdev->dev.of_node,  in orion_spi_probe()
721 					"marvell,armada-370-spi"))  in orion_spi_probe()
722 		master->max_speed_hz = min(devdata->max_hz,  in orion_spi_probe()
723 				DIV_ROUND_UP(tclk_hz, devdata->min_divisor));  in orion_spi_probe()
724 	else if (devdata->min_divisor)  in orion_spi_probe()
725 		master->max_speed_hz =  in orion_spi_probe()
726 			DIV_ROUND_UP(tclk_hz, devdata->min_divisor);  in orion_spi_probe()
728 		master->max_speed_hz = devdata->max_hz;  in orion_spi_probe()
729 	master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor);  in orion_spi_probe()
732 	spi->base = devm_ioremap_resource(&pdev->dev, r);  in orion_spi_probe()
733 	if (IS_ERR(spi->base)) {  in orion_spi_probe()
734 		status = PTR_ERR(spi->base);  in orion_spi_probe()
738 	for_each_available_child_of_node(pdev->dev.of_node, np) {  in orion_spi_probe()
742 		/* Get chip-select number from the "reg" property */  in orion_spi_probe()
745 			dev_err(&pdev->dev,  in orion_spi_probe()
754 		 * node is not configured and this device should not use the  in orion_spi_probe()
758 		status = of_address_to_resource(pdev->dev.of_node, cs + 1, r);  in orion_spi_probe()
768 		dir_acc = &spi->child[cs].direct_access;  in orion_spi_probe()
769 		dir_acc->vaddr = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);  in orion_spi_probe()
770 		if (!dir_acc->vaddr) {  in orion_spi_probe()
771 			status = -ENOMEM;  in orion_spi_probe()
775 		dir_acc->size = PAGE_SIZE;  in orion_spi_probe()
777 		dev_info(&pdev->dev, "CS%d configured for direct access\n", cs);  in orion_spi_probe()
780 	pm_runtime_set_active(&pdev->dev);  in orion_spi_probe()
781 	pm_runtime_use_autosuspend(&pdev->dev);  in orion_spi_probe()
782 	pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);  in orion_spi_probe()
783 	pm_runtime_enable(&pdev->dev);  in orion_spi_probe()
789 	master->dev.of_node = pdev->dev.of_node;  in orion_spi_probe()
797 	pm_runtime_disable(&pdev->dev);  in orion_spi_probe()
799 	clk_disable_unprepare(spi->axi_clk);  in orion_spi_probe()
801 	clk_disable_unprepare(spi->clk);  in orion_spi_probe()
813 	pm_runtime_get_sync(&pdev->dev);  in orion_spi_remove()
814 	clk_disable_unprepare(spi->axi_clk);  in orion_spi_remove()
815 	clk_disable_unprepare(spi->clk);  in orion_spi_remove()
818 	pm_runtime_disable(&pdev->dev);  in orion_spi_remove()
831 	clk_disable_unprepare(spi->axi_clk);  in orion_spi_runtime_suspend()
832 	clk_disable_unprepare(spi->clk);  in orion_spi_runtime_suspend()
841 	if (!IS_ERR(spi->axi_clk))  in orion_spi_runtime_resume()
842 		clk_prepare_enable(spi->axi_clk);  in orion_spi_runtime_resume()
843 	return clk_prepare_enable(spi->clk);  in orion_spi_runtime_resume()