25 #include <linux/mmc/slot-gpio.h>
27 #include "sdhci-pltfm.h"
54 	struct mutex	write_lock; /* protect back to back writes */
63 	/* This timeout should be sufficent for core to reset */  in sdhci_bcm_kona_sd_reset()
74 			return -EFAULT;  in sdhci_bcm_kona_sd_reset()
83 	 * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS)  in sdhci_bcm_kona_sd_reset()
84 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_reset()
85 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_reset()
86 	 * insert-removal.  in sdhci_bcm_kona_sd_reset()
103 	/* Enable the AHB clock gating module to the host */  in sdhci_bcm_kona_sd_init()
108 	 * Back-to-Back register write needs a delay of 1ms at bootup (min 10uS)  in sdhci_bcm_kona_sd_init()
109 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_init()
110 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_init()
111 	 * insert-removal.  in sdhci_bcm_kona_sd_init()
120  * IP to function properly the bit 0 of CORESTAT register needs to be set/reset
121  * to generate the CD IRQ handled in sdhci.c which schedules card_tasklet.
130 	 * Back-to-Back register write needs a delay of min 10uS.  in sdhci_bcm_kona_sd_card_emulate()
131 	 * Back-to-Back writes to same register needs delay when SD bus clock  in sdhci_bcm_kona_sd_card_emulate()
132 	 * is very low w.r.t AHB clock, mainly during boot-time and during card  in sdhci_bcm_kona_sd_card_emulate()
133 	 * insert-removal.  in sdhci_bcm_kona_sd_card_emulate()
136 	mutex_lock(&kona_dev->write_lock);  in sdhci_bcm_kona_sd_card_emulate()
143 		ret = mmc_gpio_get_ro(host->mmc);  in sdhci_bcm_kona_sd_card_emulate()
154 	mutex_unlock(&kona_dev->write_lock);  in sdhci_bcm_kona_sd_card_emulate()
164 	if (mmc_gpio_get_cd(host->mmc) > 0) {  in sdhci_bcm_kona_card_event()
165 		dev_dbg(mmc_dev(host->mmc),  in sdhci_bcm_kona_card_event()
169 		dev_dbg(mmc_dev(host->mmc),  in sdhci_bcm_kona_card_event()
179 	 *  JEDEC and SD spec specify supplying 74 continuous clocks to  in sdhci_bcm_kona_init_74_clocks()
181 	 * that translates to 740us  in sdhci_bcm_kona_init_74_clocks()
208 	{ .compatible = "brcm,kona-sdhci"},
209 	{ .compatible = "bcm,kona-sdhci"}, /* deprecated name */
218 	struct device *dev = &pdev->dev;  in sdhci_bcm_kona_probe()
229 	dev_dbg(dev, "%s: inited. IOADDR=%p\n", __func__, host->ioaddr);  in sdhci_bcm_kona_probe()
234 	mutex_init(&kona_dev->write_lock);  in sdhci_bcm_kona_probe()
236 	ret = mmc_of_parse(host->mmc);  in sdhci_bcm_kona_probe()
240 	if (!host->mmc->f_max) {  in sdhci_bcm_kona_probe()
241 		dev_err(&pdev->dev, "Missing max-freq for SDHCI cfg\n");  in sdhci_bcm_kona_probe()
242 		ret = -ENXIO;  in sdhci_bcm_kona_probe()
247 	pltfm_priv->clk = devm_clk_get(dev, NULL);  in sdhci_bcm_kona_probe()
248 	if (IS_ERR(pltfm_priv->clk)) {  in sdhci_bcm_kona_probe()
249 		dev_err(dev, "Failed to get core clock\n");  in sdhci_bcm_kona_probe()
250 		ret = PTR_ERR(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
254 	ret = clk_set_rate(pltfm_priv->clk, host->mmc->f_max);  in sdhci_bcm_kona_probe()
256 		dev_err(dev, "Failed to set rate core clock\n");  in sdhci_bcm_kona_probe()
260 	ret = clk_prepare_enable(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
262 		dev_err(dev, "Failed to enable core clock\n");  in sdhci_bcm_kona_probe()
266 	dev_dbg(dev, "non-removable=%c\n",  in sdhci_bcm_kona_probe()
267 		mmc_card_is_removable(host->mmc) ? 'N' : 'Y');  in sdhci_bcm_kona_probe()
269 		(mmc_gpio_get_cd(host->mmc) != -ENOSYS) ? 'Y' : 'N',  in sdhci_bcm_kona_probe()
270 		(mmc_gpio_get_ro(host->mmc) != -ENOSYS) ? 'Y' : 'N');  in sdhci_bcm_kona_probe()
272 	if (!mmc_card_is_removable(host->mmc))  in sdhci_bcm_kona_probe()
273 		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;  in sdhci_bcm_kona_probe()
276 		(host->mmc->caps & MMC_CAP_8_BIT_DATA) ? 'Y' : 'N');  in sdhci_bcm_kona_probe()
289 	if (!mmc_card_is_removable(host->mmc)) {  in sdhci_bcm_kona_probe()
293 				"unable to emulate card insertion\n");  in sdhci_bcm_kona_probe()
298 	 * Since the card detection GPIO interrupt is configured to be  in sdhci_bcm_kona_probe()
302 	if (mmc_gpio_get_cd(host->mmc) > 0)  in sdhci_bcm_kona_probe()
315 	clk_disable_unprepare(pltfm_priv->clk);  in sdhci_bcm_kona_probe()
320 	dev_err(dev, "Probing of sdhci-pltfm failed: %d\n", ret);  in sdhci_bcm_kona_probe()
326 		.name	= "sdhci-kona",