1 // SPDX-License-Identifier: GPL-2.0-only
6 #include <linux/delay.h>
15 #include <linux/mmc/slot-gpio.h>
17 #include "sdhci-pltfm.h"
53 	/* This timeout should be sufficent for core to reset */  in sdhci_bcm_kona_sd_reset()
56 	/* reset the host using the top level reset */  in sdhci_bcm_kona_sd_reset()
63 			pr_err("Error: sd host is stuck in reset!!!\n");  in sdhci_bcm_kona_sd_reset()
64 			return -EFAULT;  in sdhci_bcm_kona_sd_reset()
68 	/* bring the host out of reset */  in sdhci_bcm_kona_sd_reset()
73 	 * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS)  in sdhci_bcm_kona_sd_reset()
74 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_reset()
75 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_reset()
76 	 * insert-removal.  in sdhci_bcm_kona_sd_reset()
98 	 * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS)  in sdhci_bcm_kona_sd_init()
99 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_init()
100 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_init()
101 	 * insert-removal.  in sdhci_bcm_kona_sd_init()
110  * IP to function properly the bit 0 of CORESTAT register needs to be set/reset
120 	 * Back-to-Back register write needs a delay of min 10uS.  in sdhci_bcm_kona_sd_card_emulate()
121 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_card_emulate()
122 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_card_emulate()
123 	 * insert-removal.  in sdhci_bcm_kona_sd_card_emulate()
124 	 * We keep 20uS  in sdhci_bcm_kona_sd_card_emulate()
126 	mutex_lock(&kona_dev->write_lock);  in sdhci_bcm_kona_sd_card_emulate()
133 		ret = mmc_gpio_get_ro(host->mmc);  in sdhci_bcm_kona_sd_card_emulate()
144 	mutex_unlock(&kona_dev->write_lock);  in sdhci_bcm_kona_sd_card_emulate()
154 	if (mmc_gpio_get_cd(host->mmc) > 0) {  in sdhci_bcm_kona_card_event()
155 		dev_dbg(mmc_dev(host->mmc),  in sdhci_bcm_kona_card_event()
159 		dev_dbg(mmc_dev(host->mmc),  in sdhci_bcm_kona_card_event()
171 	 * that translates to 740us  in sdhci_bcm_kona_init_74_clocks()
183 	.reset = sdhci_reset,
198 	{ .compatible = "brcm,kona-sdhci"},
199 	{ .compatible = "bcm,kona-sdhci"}, /* deprecated name */
208 	struct device *dev = &pdev->dev;  in sdhci_bcm_kona_probe()
219 	dev_dbg(dev, "%s: inited. IOADDR=%p\n", __func__, host->ioaddr);  in sdhci_bcm_kona_probe()
224 	mutex_init(&kona_dev->write_lock);  in sdhci_bcm_kona_probe()
226 	ret = mmc_of_parse(host->mmc);  in sdhci_bcm_kona_probe()
230 	if (!host->mmc->f_max) {  in sdhci_bcm_kona_probe()
231 		dev_err(&pdev->dev, "Missing max-freq for SDHCI cfg\n");  in sdhci_bcm_kona_probe()
232 		ret = -ENXIO;  in sdhci_bcm_kona_probe()
237 	pltfm_priv->clk = devm_clk_get(dev, NULL);  in sdhci_bcm_kona_probe()
238 	if (IS_ERR(pltfm_priv->clk)) {  in sdhci_bcm_kona_probe()
240 		ret = PTR_ERR(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
244 	ret = clk_set_rate(pltfm_priv->clk, host->mmc->f_max);  in sdhci_bcm_kona_probe()
250 	ret = clk_prepare_enable(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
256 	dev_dbg(dev, "non-removable=%c\n",  in sdhci_bcm_kona_probe()
257 		mmc_card_is_removable(host->mmc) ? 'N' : 'Y');  in sdhci_bcm_kona_probe()
259 		(mmc_gpio_get_cd(host->mmc) != -ENOSYS) ? 'Y' : 'N',  in sdhci_bcm_kona_probe()
260 		(mmc_gpio_get_ro(host->mmc) != -ENOSYS) ? 'Y' : 'N');  in sdhci_bcm_kona_probe()
262 	if (!mmc_card_is_removable(host->mmc))  in sdhci_bcm_kona_probe()
263 		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;  in sdhci_bcm_kona_probe()
266 		(host->mmc->caps & MMC_CAP_8_BIT_DATA) ? 'Y' : 'N');  in sdhci_bcm_kona_probe()
279 	if (!mmc_card_is_removable(host->mmc)) {  in sdhci_bcm_kona_probe()
292 	if (mmc_gpio_get_cd(host->mmc) > 0)  in sdhci_bcm_kona_probe()
305 	clk_disable_unprepare(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
310 	dev_err(dev, "Probing of sdhci-pltfm failed: %d\n", ret);  in sdhci_bcm_kona_probe()
316 		.name	= "sdhci-kona",