1 // SPDX-License-Identifier: GPL-2.0-only
2 /* linux/drivers/mmc/host/sdhci-s3c.c
9  * SDHCI (HSMMC) support for Samsung SoC
14 #include <linux/dma-mapping.h>
16 #include <linux/platform_data/mmc-sdhci-s3c.h>
27 #include "sdhci.h"
61 #define S3C_SDHCI_CTRL2_ENCLKOUTHOLD		BIT(8)
84 #define S3C_SDHCI_CTRL3_FIA1_MASK		(0x7f << 8)
85 #define S3C_SDHCI_CTRL3_FIA1_SHIFT		(8)
86 #define S3C_SDHCI_CTRL3_FIA1(_x)		((_x) << 8)
102  * struct sdhci_s3c - S3C SDHCI instance
103  * @host: The SDHCI host created
112  * @no_divider: No or non-standard internal clock divider.
130  * struct sdhci_s3c_drv_data - S3C SDHCI platform specific driver data
131  * @sdhci_quirks: sdhci host specific quirks.
132  * @no_divider: no or non-standard internal clock divider.
135  * Specifies platform specific configuration of sdhci controller.
151  * sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
152  * @host: The SDHCI host instance.
163 		rate = ourhost->clk_rates[src];  in sdhci_s3c_get_max_clk()
172  * sdhci_s3c_consider_clock - consider one the bus clocks for current setting
173  * @ourhost: Our SDHCI instance.
182 	struct clk *clksrc = ourhost->clk_bus[src];  in sdhci_s3c_consider_clock()
189 	 * If controller uses a non-standard clock division, find the best clock  in sdhci_s3c_consider_clock()
192 	if (ourhost->no_divider) {  in sdhci_s3c_consider_clock()
194 		return wanted - rate;  in sdhci_s3c_consider_clock()
197 	rate = ourhost->clk_rates[src];  in sdhci_s3c_consider_clock()
199 	for (shift = 0; shift <= 8; ++shift) {  in sdhci_s3c_consider_clock()
204 	if (shift > 8) {  in sdhci_s3c_consider_clock()
205 		dev_dbg(&ourhost->pdev->dev,  in sdhci_s3c_consider_clock()
211 	dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",  in sdhci_s3c_consider_clock()
214 	return wanted - (rate >> shift);  in sdhci_s3c_consider_clock()
218  * sdhci_s3c_set_clock - callback on clock change
219  * @host: The SDHCI host being changed
234 	host->mmc->actual_clock = 0;  in sdhci_s3c_set_clock()
250 	dev_dbg(&ourhost->pdev->dev,  in sdhci_s3c_set_clock()
255 	if (ourhost->cur_clk != best_src) {  in sdhci_s3c_set_clock()
256 		struct clk *clk = ourhost->clk_bus[best_src];  in sdhci_s3c_set_clock()
259 		if (ourhost->cur_clk >= 0)  in sdhci_s3c_set_clock()
261 					ourhost->clk_bus[ourhost->cur_clk]);  in sdhci_s3c_set_clock()
263 		ourhost->cur_clk = best_src;  in sdhci_s3c_set_clock()
264 		host->max_clk = ourhost->clk_rates[best_src];  in sdhci_s3c_set_clock()
268 	writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);  in sdhci_s3c_set_clock()
270 	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);  in sdhci_s3c_set_clock()
273 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);  in sdhci_s3c_set_clock()
277 		host->ioaddr + S3C64XX_SDHCI_CONTROL4);  in sdhci_s3c_set_clock()
279 	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);  in sdhci_s3c_set_clock()
285 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);  in sdhci_s3c_set_clock()
291 	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);  in sdhci_s3c_set_clock()
297  * sdhci_s3c_get_min_clock - callback to get minimal supported clock value
298  * @host: The SDHCI host being queried
312 		rate = ourhost->clk_rates[src] / 256;  in sdhci_s3c_get_min_clock()
322 /* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
332 		clk = ourhost->clk_bus[src];  in sdhci_cmu_get_max_clock()
344 /* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
354 		clk = ourhost->clk_bus[src];  in sdhci_cmu_get_min_clock()
366 /* sdhci_cmu_set_clock - callback on clock change.*/
370 	struct device *dev = &ourhost->pdev->dev;  in sdhci_cmu_set_clock()
375 	host->mmc->actual_clock = 0;  in sdhci_cmu_set_clock()
390 	ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);  in sdhci_cmu_set_clock()
393 			mmc_hostname(host->mmc), clock);  in sdhci_cmu_set_clock()
406 				mmc_hostname(host->mmc));  in sdhci_cmu_set_clock()
409 		timeout--;  in sdhci_cmu_set_clock()
439 	struct device_node *node = dev->of_node;  in sdhci_s3c_parse_dt()
442 	/* if the bus-width property is not specified, assume width as 1 */  in sdhci_s3c_parse_dt()
443 	if (of_property_read_u32(node, "bus-width", &max_width))  in sdhci_s3c_parse_dt()
445 	pdata->max_width = max_width;  in sdhci_s3c_parse_dt()
448 	if (of_property_read_bool(node, "broken-cd")) {  in sdhci_s3c_parse_dt()
449 		pdata->cd_type = S3C_SDHCI_CD_NONE;  in sdhci_s3c_parse_dt()
453 	if (of_property_read_bool(node, "non-removable")) {  in sdhci_s3c_parse_dt()
454 		pdata->cd_type = S3C_SDHCI_CD_PERMANENT;  in sdhci_s3c_parse_dt()
458 	if (of_property_present(node, "cd-gpios"))  in sdhci_s3c_parse_dt()
462 	pdata->cd_type = S3C_SDHCI_CD_INTERNAL;  in sdhci_s3c_parse_dt()
469 	return -EINVAL;  in sdhci_s3c_parse_dt()
477 	if (pdev->dev.of_node)  in sdhci_s3c_get_driver_data()
478 		return of_device_get_match_data(&pdev->dev);  in sdhci_s3c_get_driver_data()
481 			platform_get_device_id(pdev)->driver_data;  in sdhci_s3c_get_driver_data()
488 	struct device *dev = &pdev->dev;  in sdhci_s3c_probe()
493 	if (!pdev->dev.platform_data && !pdev->dev.of_node) {  in sdhci_s3c_probe()
495 		return -ENOENT;  in sdhci_s3c_probe()
509 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);  in sdhci_s3c_probe()
511 		ret = -ENOMEM;  in sdhci_s3c_probe()
515 	if (pdev->dev.of_node) {  in sdhci_s3c_probe()
516 		ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);  in sdhci_s3c_probe()
520 		memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));  in sdhci_s3c_probe()
525 	sc->host = host;  in sdhci_s3c_probe()
526 	sc->pdev = pdev;  in sdhci_s3c_probe()
527 	sc->pdata = pdata;  in sdhci_s3c_probe()
528 	sc->cur_clk = -1;  in sdhci_s3c_probe()
532 	sc->clk_io = devm_clk_get(dev, "hsmmc");  in sdhci_s3c_probe()
533 	if (IS_ERR(sc->clk_io)) {  in sdhci_s3c_probe()
535 		ret = PTR_ERR(sc->clk_io);  in sdhci_s3c_probe()
540 	clk_prepare_enable(sc->clk_io);  in sdhci_s3c_probe()
546 		sc->clk_bus[ptr] = devm_clk_get(dev, name);  in sdhci_s3c_probe()
547 		if (IS_ERR(sc->clk_bus[ptr]))  in sdhci_s3c_probe()
551 		sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]);  in sdhci_s3c_probe()
554 				ptr, name, sc->clk_rates[ptr]);  in sdhci_s3c_probe()
559 		ret = -ENOENT;  in sdhci_s3c_probe()
563 	host->ioaddr = devm_platform_ioremap_resource(pdev, 0);  in sdhci_s3c_probe()
564 	if (IS_ERR(host->ioaddr)) {  in sdhci_s3c_probe()
565 		ret = PTR_ERR(host->ioaddr);  in sdhci_s3c_probe()
570 	if (pdata->cfg_gpio)  in sdhci_s3c_probe()
571 		pdata->cfg_gpio(pdev, pdata->max_width);  in sdhci_s3c_probe()
573 	host->hw_name = "samsung-hsmmc";  in sdhci_s3c_probe()
574 	host->ops = &sdhci_s3c_ops_s3c6410;  in sdhci_s3c_probe()
575 	host->quirks = 0;  in sdhci_s3c_probe()
576 	host->quirks2 = 0;  in sdhci_s3c_probe()
577 	host->irq = irq;  in sdhci_s3c_probe()
580 	host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;  in sdhci_s3c_probe()
581 	host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;  in sdhci_s3c_probe()
583 		host->quirks |= drv_data->sdhci_quirks;  in sdhci_s3c_probe()
584 		host->ops = drv_data->ops;  in sdhci_s3c_probe()
585 		sc->no_divider = drv_data->no_divider;  in sdhci_s3c_probe()
592 	host->quirks |= SDHCI_QUIRK_BROKEN_DMA;  in sdhci_s3c_probe()
596 	/* It seems we do not get an DATA transfer complete on non-busy  in sdhci_s3c_probe()
598 	 * SDHCI block, or a missing configuration that needs to be set. */  in sdhci_s3c_probe()
599 	host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;  in sdhci_s3c_probe()
602 	host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;  in sdhci_s3c_probe()
605 	host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;  in sdhci_s3c_probe()
607 	if (pdata->cd_type == S3C_SDHCI_CD_NONE ||  in sdhci_s3c_probe()
608 	    pdata->cd_type == S3C_SDHCI_CD_PERMANENT)  in sdhci_s3c_probe()
609 		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;  in sdhci_s3c_probe()
611 	if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)  in sdhci_s3c_probe()
612 		host->mmc->caps = MMC_CAP_NONREMOVABLE;  in sdhci_s3c_probe()
614 	switch (pdata->max_width) {  in sdhci_s3c_probe()
615 	case 8:  in sdhci_s3c_probe()
616 		host->mmc->caps |= MMC_CAP_8_BIT_DATA;  in sdhci_s3c_probe()
619 		host->mmc->caps |= MMC_CAP_4_BIT_DATA;  in sdhci_s3c_probe()
623 	if (pdata->pm_caps)  in sdhci_s3c_probe()
624 		host->mmc->pm_caps |= pdata->pm_caps;  in sdhci_s3c_probe()
626 	host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |  in sdhci_s3c_probe()
630 	host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;  in sdhci_s3c_probe()
633 	if (pdata->host_caps)  in sdhci_s3c_probe()
634 		host->mmc->caps |= pdata->host_caps;  in sdhci_s3c_probe()
636 	if (pdata->host_caps2)  in sdhci_s3c_probe()
637 		host->mmc->caps2 |= pdata->host_caps2;  in sdhci_s3c_probe()
639 	pm_runtime_enable(&pdev->dev);  in sdhci_s3c_probe()
640 	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);  in sdhci_s3c_probe()
641 	pm_runtime_use_autosuspend(&pdev->dev);  in sdhci_s3c_probe()
642 	pm_suspend_ignore_children(&pdev->dev, 1);  in sdhci_s3c_probe()
644 	ret = mmc_of_parse(host->mmc);  in sdhci_s3c_probe()
653 	if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)  in sdhci_s3c_probe()
654 		clk_disable_unprepare(sc->clk_io);  in sdhci_s3c_probe()
659 	pm_runtime_disable(&pdev->dev);  in sdhci_s3c_probe()
662 	clk_disable_unprepare(sc->clk_io);  in sdhci_s3c_probe()
675 	if (sc->ext_cd_irq)  in sdhci_s3c_remove()
676 		free_irq(sc->ext_cd_irq, sc);  in sdhci_s3c_remove()
679 	if (sc->pdata->cd_type != S3C_SDHCI_CD_INTERNAL)  in sdhci_s3c_remove()
680 		clk_prepare_enable(sc->clk_io);  in sdhci_s3c_remove()
684 	pm_runtime_dont_use_autosuspend(&pdev->dev);  in sdhci_s3c_remove()
685 	pm_runtime_disable(&pdev->dev);  in sdhci_s3c_remove()
687 	clk_disable_unprepare(sc->clk_io);  in sdhci_s3c_remove()
697 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)  in sdhci_s3c_suspend()
698 		mmc_retune_needed(host->mmc);  in sdhci_s3c_suspend()
716 	struct clk *busclk = ourhost->clk_io;  in sdhci_s3c_runtime_suspend()
721 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)  in sdhci_s3c_runtime_suspend()
722 		mmc_retune_needed(host->mmc);  in sdhci_s3c_runtime_suspend()
724 	if (ourhost->cur_clk >= 0)  in sdhci_s3c_runtime_suspend()
725 		clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);  in sdhci_s3c_runtime_suspend()
734 	struct clk *busclk = ourhost->clk_io;  in sdhci_s3c_runtime_resume()
738 	if (ourhost->cur_clk >= 0)  in sdhci_s3c_runtime_resume()
739 		clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);  in sdhci_s3c_runtime_resume()
753 		.name		= "s3c-sdhci",
767 	{ .compatible = "samsung,s3c6410-sdhci", },
768 	{ .compatible = "samsung,exynos4210-sdhci",
780 		.name	= "s3c-sdhci",
789 MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");