drivers/mmc/host/sdhci-pxav3.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2010 Marvell International Ltd.
  *		Zhangfei Gao <zhangfei.gao@marvell.com>
  *		Kevin Wang <dwang4@marvell.com>
  *		Mingwei Wang <mwwang@marvell.com>
  *		Philip Rakity <prakity@marvell.com>
  *		Mark Brown <markb@marvell.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/slot-gpio.h>
 #include <linux/platform_data/pxa_sdhci.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/mbus.h>

 #include "sdhci.h"
 #include "sdhci-pltfm.h"

 #define PXAV3_RPM_DELAY_MS     50

 #define SD_CLOCK_BURST_SIZE_SETUP		0x10A
 #define SDCLK_SEL	0x100
 #define SDCLK_DELAY_SHIFT	9
 #define SDCLK_DELAY_MASK	0x1f

 #define SD_CFG_FIFO_PARAM       0x100
 #define SDCFG_GEN_PAD_CLK_ON	(1<<6)
 #define SDCFG_GEN_PAD_CLK_CNT_MASK	0xFF
 #define SDCFG_GEN_PAD_CLK_CNT_SHIFT	24

 #define SD_SPI_MODE          0x108
 #define SD_CE_ATA_1          0x10C

 #define SD_CE_ATA_2          0x10E
 #define SDCE_MISC_INT		(1<<2)
 #define SDCE_MISC_INT_EN	(1<<1)

 /*
  * These registers are relative to the second register region, for the
  * MBus bridge.
  */
 #define SDHCI_WINDOW_CTRL(i)	(0x80 + ((i) << 3))
 #define SDHCI_WINDOW_BASE(i)	(0x84 + ((i) << 3))
 #define SDHCI_MAX_WIN_NUM	8

 static int mv_conf_mbus_windows(struct platform_device *pdev,
 				const struct mbus_dram_target_info *dram)
 {
 	int i;
 	void __iomem *regs;
 	struct resource *res;

 	if (!dram) {
 		dev_err(&pdev->dev, "no mbus dram info\n");
 		return -EINVAL;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!res) {
 		dev_err(&pdev->dev, "cannot get mbus registers\n");
 		return -EINVAL;
 	}

 	regs = ioremap(res->start, resource_size(res));
 	if (!regs) {
 		dev_err(&pdev->dev, "cannot map mbus registers\n");
 		return -ENOMEM;
 	}

 	for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) {
 		writel(0, regs + SDHCI_WINDOW_CTRL(i));
 		writel(0, regs + SDHCI_WINDOW_BASE(i));
 	}

 	for (i = 0; i < dram->num_cs; i++) {
 		const struct mbus_dram_window *cs = dram->cs + i;

 		/* Write size, attributes and target id to control register */
 		writel(((cs->size - 1) & 0xffff0000) |
 			(cs->mbus_attr << 8) |
 			(dram->mbus_dram_target_id << 4) | 1,
 			regs + SDHCI_WINDOW_CTRL(i));
 		/* Write base address to base register */
 		writel(cs->base, regs + SDHCI_WINDOW_BASE(i));
 	}

 	iounmap(regs);

 	return 0;
 }

 static void pxav3_reset(struct sdhci_host *host, u8 mask)
 {
 	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
 	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;

 	sdhci_reset(host, mask);

 	if (mask == SDHCI_RESET_ALL) {
 		/*
 		 * tune timing of read data/command when crc error happen
 		 * no performance impact
 		 */
 		if (pdata && 0 != pdata->clk_delay_cycles) {
 			u16 tmp;

 			tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
 			tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
 				<< SDCLK_DELAY_SHIFT;
 			tmp |= SDCLK_SEL;
 			writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
 		}
 	}
 }

 #define MAX_WAIT_COUNT 5
 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_pxa *pxa = pltfm_host->priv;
 	u16 tmp;
 	int count;

 	if (pxa->power_mode == MMC_POWER_UP
 			&& power_mode == MMC_POWER_ON) {

 		dev_dbg(mmc_dev(host->mmc),
 				"%s: slot->power_mode = %d,"
 				"ios->power_mode = %d\n",
 				__func__,
 				pxa->power_mode,
 				power_mode);

 		/* set we want notice of when 74 clocks are sent */
 		tmp = readw(host->ioaddr + SD_CE_ATA_2);
 		tmp |= SDCE_MISC_INT_EN;
 		writew(tmp, host->ioaddr + SD_CE_ATA_2);

 		/* start sending the 74 clocks */
 		tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM);
 		tmp |= SDCFG_GEN_PAD_CLK_ON;
 		writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM);

 		/* slowest speed is about 100KHz or 10usec per clock */
 		udelay(740);
 		count = 0;

 		while (count++ < MAX_WAIT_COUNT) {
 			if ((readw(host->ioaddr + SD_CE_ATA_2)
 						& SDCE_MISC_INT) == 0)
 				break;
 			udelay(10);
 		}

 		if (count == MAX_WAIT_COUNT)
 			dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n");

 		/* clear the interrupt bit if posted */
 		tmp = readw(host->ioaddr + SD_CE_ATA_2);
 		tmp |= SDCE_MISC_INT;
 		writew(tmp, host->ioaddr + SD_CE_ATA_2);
 	}
 	pxa->power_mode = power_mode;
 }

 static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
 {
 	u16 ctrl_2;

 	/*
 	 * Set V18_EN -- UHS modes do not work without this.
 	 * does not change signaling voltage
 	 */
 	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);

 	/* Select Bus Speed Mode for host */
 	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
 	switch (uhs) {
 	case MMC_TIMING_UHS_SDR12:
 		ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
 		break;
 	case MMC_TIMING_UHS_SDR25:
 		ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
 		break;
 	case MMC_TIMING_UHS_SDR50:
 		ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
 		break;
 	case MMC_TIMING_UHS_SDR104:
 		ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
 		break;
 	case MMC_TIMING_UHS_DDR50:
 		ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
 		break;
 	}

 	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
 	dev_dbg(mmc_dev(host->mmc),
 		"%s uhs = %d, ctrl_2 = %04X\n",
 		__func__, uhs, ctrl_2);
 }

 static const struct sdhci_ops pxav3_sdhci_ops = {
 	.set_clock = sdhci_set_clock,
 	.set_uhs_signaling = pxav3_set_uhs_signaling,
 	.platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_bus_width = sdhci_set_bus_width,
 	.reset = pxav3_reset,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 };

 static struct sdhci_pltfm_data sdhci_pxav3_pdata = {
 	.quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK
 		| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
 		| SDHCI_QUIRK_32BIT_ADMA_SIZE
 		| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
 	.ops = &pxav3_sdhci_ops,
 };

 #ifdef CONFIG_OF
 static const struct of_device_id sdhci_pxav3_of_match[] = {
 	{
 		.compatible = "mrvl,pxav3-mmc",
 	},
 	{
 		.compatible = "marvell,armada-380-sdhci",
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match);

 static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
 {
 	struct sdhci_pxa_platdata *pdata;
 	struct device_node *np = dev->of_node;
 	u32 clk_delay_cycles;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return NULL;

 	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
 	if (clk_delay_cycles > 0)
 		pdata->clk_delay_cycles = clk_delay_cycles;

 	return pdata;
 }
 #else
 static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
 {
 	return NULL;
 }
 #endif

 static int sdhci_pxav3_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = pdev->dev.of_node;
 	struct sdhci_host *host = NULL;
 	struct sdhci_pxa *pxa = NULL;
 	const struct of_device_id *match;

 	int ret;
 	struct clk *clk;

 	pxa = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_pxa), GFP_KERNEL);
 	if (!pxa)
 		return -ENOMEM;

 	host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, 0);
 	if (IS_ERR(host))
 		return PTR_ERR(host);

 	if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) {
 		ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info());
 		if (ret < 0)
 			goto err_mbus_win;
 	}


 	pltfm_host = sdhci_priv(host);
 	pltfm_host->priv = pxa;

 	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get io clock\n");
 		ret = PTR_ERR(clk);
 		goto err_clk_get;
 	}
 	pltfm_host->clk = clk;
 	clk_prepare_enable(clk);

 	/* enable 1/8V DDR capable */
 	host->mmc->caps |= MMC_CAP_1_8V_DDR;

 	match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);
 	if (match) {
 		ret = mmc_of_parse(host->mmc);
 		if (ret)
 			goto err_of_parse;
 		sdhci_get_of_property(pdev);
 		pdata = pxav3_get_mmc_pdata(dev);
 	} else if (pdata) {
 		/* on-chip device */
 		if (pdata->flags & PXA_FLAG_CARD_PERMANENT)
 			host->mmc->caps |= MMC_CAP_NONREMOVABLE;

 		/* If slot design supports 8 bit data, indicate this to MMC. */
 		if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
 			host->mmc->caps |= MMC_CAP_8_BIT_DATA;

 		if (pdata->quirks)
 			host->quirks |= pdata->quirks;
 		if (pdata->quirks2)
 			host->quirks2 |= pdata->quirks2;
 		if (pdata->host_caps)
 			host->mmc->caps |= pdata->host_caps;
 		if (pdata->host_caps2)
 			host->mmc->caps2 |= pdata->host_caps2;
 		if (pdata->pm_caps)
 			host->mmc->pm_caps |= pdata->pm_caps;

 		if (gpio_is_valid(pdata->ext_cd_gpio)) {
 			ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio,
 						  0);
 			if (ret) {
 				dev_err(mmc_dev(host->mmc),
 					"failed to allocate card detect gpio\n");
 				goto err_cd_req;
 			}
 		}
 	}

 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_suspend_ignore_children(&pdev->dev, 1);

 	ret = sdhci_add_host(host);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add host\n");
 		goto err_add_host;
 	}

 	platform_set_drvdata(pdev, host);

 	if (host->mmc->pm_caps & MMC_PM_KEEP_POWER) {
 		device_init_wakeup(&pdev->dev, 1);
 		host->mmc->pm_flags |= MMC_PM_WAKE_SDIO_IRQ;
 	} else {
 		device_init_wakeup(&pdev->dev, 0);
 	}

 	pm_runtime_put_autosuspend(&pdev->dev);

 	return 0;

 err_of_parse:
 err_cd_req:
 err_add_host:
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	clk_disable_unprepare(clk);
 err_clk_get:
 err_mbus_win:
 	sdhci_pltfm_free(pdev);
 	return ret;
 }

 static int sdhci_pxav3_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

 	pm_runtime_get_sync(&pdev->dev);
 	sdhci_remove_host(host, 1);
 	pm_runtime_disable(&pdev->dev);

 	clk_disable_unprepare(pltfm_host->clk);

 	sdhci_pltfm_free(pdev);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int sdhci_pxav3_suspend(struct device *dev)
 {
 	int ret;
 	struct sdhci_host *host = dev_get_drvdata(dev);

 	pm_runtime_get_sync(dev);
 	ret = sdhci_suspend_host(host);
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);

 	return ret;
 }

 static int sdhci_pxav3_resume(struct device *dev)
 {
 	int ret;
 	struct sdhci_host *host = dev_get_drvdata(dev);

 	pm_runtime_get_sync(dev);
 	ret = sdhci_resume_host(host);
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);

 	return ret;
 }
 #endif

 #ifdef CONFIG_PM_RUNTIME
 static int sdhci_pxav3_runtime_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	unsigned long flags;

 	if (pltfm_host->clk) {
 		spin_lock_irqsave(&host->lock, flags);
 		host->runtime_suspended = true;
 		spin_unlock_irqrestore(&host->lock, flags);

 		clk_disable_unprepare(pltfm_host->clk);
 	}

 	return 0;
 }

 static int sdhci_pxav3_runtime_resume(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	unsigned long flags;

 	if (pltfm_host->clk) {
 		clk_prepare_enable(pltfm_host->clk);

 		spin_lock_irqsave(&host->lock, flags);
 		host->runtime_suspended = false;
 		spin_unlock_irqrestore(&host->lock, flags);
 	}

 	return 0;
 }
 #endif

 #ifdef CONFIG_PM
 static const struct dev_pm_ops sdhci_pxav3_pmops = {
 	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume)
 	SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend,
 		sdhci_pxav3_runtime_resume, NULL)
 };

 #define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops)

 #else
 #define SDHCI_PXAV3_PMOPS NULL
 #endif

 static struct platform_driver sdhci_pxav3_driver = {
 	.driver		= {
 		.name	= "sdhci-pxav3",
 #ifdef CONFIG_OF
 		.of_match_table = sdhci_pxav3_of_match,
 #endif
 		.owner	= THIS_MODULE,
 		.pm	= SDHCI_PXAV3_PMOPS,
 	},
 	.probe		= sdhci_pxav3_probe,
 	.remove		= sdhci_pxav3_remove,
 };

 module_platform_driver(sdhci_pxav3_driver);

 MODULE_DESCRIPTION("SDHCI driver for pxav3");
 MODULE_AUTHOR("Marvell International Ltd.");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) 2010 Marvell International Ltd.
	* Zhangfei Gao <zhangfei.gao@marvell.com>
	* Kevin Wang <dwang4@marvell.com>
	* Mingwei Wang <mwwang@marvell.com>
	* Philip Rakity <prakity@marvell.com>
	* Mark Brown <markb@marvell.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/gpio.h>
	#include <linux/mmc/card.h>
	#include <linux/mmc/host.h>
	#include <linux/mmc/slot-gpio.h>
	#include <linux/platform_data/pxa_sdhci.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_gpio.h>
	#include <linux/pm.h>
	#include <linux/pm_runtime.h>
	#include <linux/mbus.h>

	#include "sdhci.h"
	#include "sdhci-pltfm.h"

	#define PXAV3_RPM_DELAY_MS 50

	#define SD_CLOCK_BURST_SIZE_SETUP 0x10A
	#define SDCLK_SEL 0x100
	#define SDCLK_DELAY_SHIFT 9
	#define SDCLK_DELAY_MASK 0x1f

	#define SD_CFG_FIFO_PARAM 0x100
	#define SDCFG_GEN_PAD_CLK_ON (1<<6)
	#define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF
	#define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24

	#define SD_SPI_MODE 0x108
	#define SD_CE_ATA_1 0x10C

	#define SD_CE_ATA_2 0x10E
	#define SDCE_MISC_INT (1<<2)
	#define SDCE_MISC_INT_EN (1<<1)

	/*
	* These registers are relative to the second register region, for the
	* MBus bridge.
	*/
	#define SDHCI_WINDOW_CTRL(i) (0x80 + ((i) << 3))
	#define SDHCI_WINDOW_BASE(i) (0x84 + ((i) << 3))
	#define SDHCI_MAX_WIN_NUM 8

	static int mv_conf_mbus_windows(struct platform_device *pdev,
	const struct mbus_dram_target_info *dram)
	{
	int i;
	void __iomem *regs;
	struct resource *res;

	if (!dram) {
	dev_err(&pdev->dev, "no mbus dram info\n");
	return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res) {
	dev_err(&pdev->dev, "cannot get mbus registers\n");
	return -EINVAL;
	}

	regs = ioremap(res->start, resource_size(res));
	if (!regs) {
	dev_err(&pdev->dev, "cannot map mbus registers\n");
	return -ENOMEM;
	}

	for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) {
	writel(0, regs + SDHCI_WINDOW_CTRL(i));
	writel(0, regs + SDHCI_WINDOW_BASE(i));
	}

	for (i = 0; i < dram->num_cs; i++) {
	const struct mbus_dram_window *cs = dram->cs + i;

	/* Write size, attributes and target id to control register */
	writel(((cs->size - 1) & 0xffff0000) \|
	(cs->mbus_attr << 8) \|
	(dram->mbus_dram_target_id << 4) \| 1,
	regs + SDHCI_WINDOW_CTRL(i));
	/* Write base address to base register */
	writel(cs->base, regs + SDHCI_WINDOW_BASE(i));
	}

	iounmap(regs);

	return 0;
	}

	static void pxav3_reset(struct sdhci_host *host, u8 mask)
	{
	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;

	sdhci_reset(host, mask);

	if (mask == SDHCI_RESET_ALL) {
	/*
	* tune timing of read data/command when crc error happen
	* no performance impact
	*/
	if (pdata && 0 != pdata->clk_delay_cycles) {
	u16 tmp;

	tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
	tmp \|= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
	<< SDCLK_DELAY_SHIFT;
	tmp \|= SDCLK_SEL;
	writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
	}
	}
	}

	#define MAX_WAIT_COUNT 5
	static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_pxa *pxa = pltfm_host->priv;
	u16 tmp;
	int count;

	if (pxa->power_mode == MMC_POWER_UP
	&& power_mode == MMC_POWER_ON) {

	dev_dbg(mmc_dev(host->mmc),
	"%s: slot->power_mode = %d,"
	"ios->power_mode = %d\n",
	__func__,
	pxa->power_mode,
	power_mode);

	/* set we want notice of when 74 clocks are sent */
	tmp = readw(host->ioaddr + SD_CE_ATA_2);
	tmp \|= SDCE_MISC_INT_EN;
	writew(tmp, host->ioaddr + SD_CE_ATA_2);

	/* start sending the 74 clocks */
	tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM);
	tmp \|= SDCFG_GEN_PAD_CLK_ON;
	writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM);

	/* slowest speed is about 100KHz or 10usec per clock */
	udelay(740);
	count = 0;

	while (count++ < MAX_WAIT_COUNT) {
	if ((readw(host->ioaddr + SD_CE_ATA_2)
	& SDCE_MISC_INT) == 0)
	break;
	udelay(10);
	}

	if (count == MAX_WAIT_COUNT)
	dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n");

	/* clear the interrupt bit if posted */
	tmp = readw(host->ioaddr + SD_CE_ATA_2);
	tmp \|= SDCE_MISC_INT;
	writew(tmp, host->ioaddr + SD_CE_ATA_2);
	}
	pxa->power_mode = power_mode;
	}

	static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
	{
	u16 ctrl_2;

	/*
	* Set V18_EN -- UHS modes do not work without this.
	* does not change signaling voltage
	*/
	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);

	/* Select Bus Speed Mode for host */
	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
	switch (uhs) {
	case MMC_TIMING_UHS_SDR12:
	ctrl_2 \|= SDHCI_CTRL_UHS_SDR12;
	break;
	case MMC_TIMING_UHS_SDR25:
	ctrl_2 \|= SDHCI_CTRL_UHS_SDR25;
	break;
	case MMC_TIMING_UHS_SDR50:
	ctrl_2 \|= SDHCI_CTRL_UHS_SDR50 \| SDHCI_CTRL_VDD_180;
	break;
	case MMC_TIMING_UHS_SDR104:
	ctrl_2 \|= SDHCI_CTRL_UHS_SDR104 \| SDHCI_CTRL_VDD_180;
	break;
	case MMC_TIMING_UHS_DDR50:
	ctrl_2 \|= SDHCI_CTRL_UHS_DDR50 \| SDHCI_CTRL_VDD_180;
	break;
	}

	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
	dev_dbg(mmc_dev(host->mmc),
	"%s uhs = %d, ctrl_2 = %04X\n",
	__func__, uhs, ctrl_2);
	}

	static const struct sdhci_ops pxav3_sdhci_ops = {
	.set_clock = sdhci_set_clock,
	.set_uhs_signaling = pxav3_set_uhs_signaling,
	.platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.set_bus_width = sdhci_set_bus_width,
	.reset = pxav3_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	};

	static struct sdhci_pltfm_data sdhci_pxav3_pdata = {
	.quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK
	\| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
	\| SDHCI_QUIRK_32BIT_ADMA_SIZE
	\| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
	.ops = &pxav3_sdhci_ops,
	};

	#ifdef CONFIG_OF
	static const struct of_device_id sdhci_pxav3_of_match[] = {
	{
	.compatible = "mrvl,pxav3-mmc",
	},
	{
	.compatible = "marvell,armada-380-sdhci",
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match);

	static struct sdhci_pxa_platdata pxav3_get_mmc_pdata(struct device dev)
	{
	struct sdhci_pxa_platdata *pdata;
	struct device_node *np = dev->of_node;
	u32 clk_delay_cycles;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return NULL;

	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
	if (clk_delay_cycles > 0)
	pdata->clk_delay_cycles = clk_delay_cycles;

	return pdata;
	}
	#else
	static inline struct sdhci_pxa_platdata pxav3_get_mmc_pdata(struct device dev)
	{
	return NULL;
	}
	#endif

	static int sdhci_pxav3_probe(struct platform_device *pdev)
	{
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
	struct device *dev = &pdev->dev;
	struct device_node *np = pdev->dev.of_node;
	struct sdhci_host *host = NULL;
	struct sdhci_pxa *pxa = NULL;
	const struct of_device_id *match;

	int ret;
	struct clk *clk;

	pxa = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_pxa), GFP_KERNEL);
	if (!pxa)
	return -ENOMEM;

	host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, 0);
	if (IS_ERR(host))
	return PTR_ERR(host);

	if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) {
	ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info());
	if (ret < 0)
	goto err_mbus_win;
	}


	pltfm_host = sdhci_priv(host);
	pltfm_host->priv = pxa;

	clk = devm_clk_get(dev, NULL);
	if (IS_ERR(clk)) {
	dev_err(dev, "failed to get io clock\n");
	ret = PTR_ERR(clk);
	goto err_clk_get;
	}
	pltfm_host->clk = clk;
	clk_prepare_enable(clk);

	/* enable 1/8V DDR capable */
	host->mmc->caps \|= MMC_CAP_1_8V_DDR;

	match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);
	if (match) {
	ret = mmc_of_parse(host->mmc);
	if (ret)
	goto err_of_parse;
	sdhci_get_of_property(pdev);
	pdata = pxav3_get_mmc_pdata(dev);
	} else if (pdata) {
	/* on-chip device */
	if (pdata->flags & PXA_FLAG_CARD_PERMANENT)
	host->mmc->caps \|= MMC_CAP_NONREMOVABLE;

	/* If slot design supports 8 bit data, indicate this to MMC. */
	if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
	host->mmc->caps \|= MMC_CAP_8_BIT_DATA;

	if (pdata->quirks)
	host->quirks \|= pdata->quirks;
	if (pdata->quirks2)
	host->quirks2 \|= pdata->quirks2;
	if (pdata->host_caps)
	host->mmc->caps \|= pdata->host_caps;
	if (pdata->host_caps2)
	host->mmc->caps2 \|= pdata->host_caps2;
	if (pdata->pm_caps)
	host->mmc->pm_caps \|= pdata->pm_caps;

	if (gpio_is_valid(pdata->ext_cd_gpio)) {
	ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio,
	0);
	if (ret) {
	dev_err(mmc_dev(host->mmc),
	"failed to allocate card detect gpio\n");
	goto err_cd_req;
	}
	}
	}

	pm_runtime_enable(&pdev->dev);
	pm_runtime_get_sync(&pdev->dev);
	pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_suspend_ignore_children(&pdev->dev, 1);

	ret = sdhci_add_host(host);
	if (ret) {
	dev_err(&pdev->dev, "failed to add host\n");
	goto err_add_host;
	}

	platform_set_drvdata(pdev, host);

	if (host->mmc->pm_caps & MMC_PM_KEEP_POWER) {
	device_init_wakeup(&pdev->dev, 1);
	host->mmc->pm_flags \|= MMC_PM_WAKE_SDIO_IRQ;
	} else {
	device_init_wakeup(&pdev->dev, 0);
	}

	pm_runtime_put_autosuspend(&pdev->dev);

	return 0;

	err_of_parse:
	err_cd_req:
	err_add_host:
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(clk);
	err_clk_get:
	err_mbus_win:
	sdhci_pltfm_free(pdev);
	return ret;
	}

	static int sdhci_pxav3_remove(struct platform_device *pdev)
	{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	pm_runtime_get_sync(&pdev->dev);
	sdhci_remove_host(host, 1);
	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(pltfm_host->clk);

	sdhci_pltfm_free(pdev);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int sdhci_pxav3_suspend(struct device *dev)
	{
	int ret;
	struct sdhci_host *host = dev_get_drvdata(dev);

	pm_runtime_get_sync(dev);
	ret = sdhci_suspend_host(host);
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return ret;
	}

	static int sdhci_pxav3_resume(struct device *dev)
	{
	int ret;
	struct sdhci_host *host = dev_get_drvdata(dev);

	pm_runtime_get_sync(dev);
	ret = sdhci_resume_host(host);
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return ret;
	}
	#endif

	#ifdef CONFIG_PM_RUNTIME
	static int sdhci_pxav3_runtime_suspend(struct device *dev)
	{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	unsigned long flags;

	if (pltfm_host->clk) {
	spin_lock_irqsave(&host->lock, flags);
	host->runtime_suspended = true;
	spin_unlock_irqrestore(&host->lock, flags);

	clk_disable_unprepare(pltfm_host->clk);
	}

	return 0;
	}

	static int sdhci_pxav3_runtime_resume(struct device *dev)
	{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	unsigned long flags;

	if (pltfm_host->clk) {
	clk_prepare_enable(pltfm_host->clk);

	spin_lock_irqsave(&host->lock, flags);
	host->runtime_suspended = false;
	spin_unlock_irqrestore(&host->lock, flags);
	}

	return 0;
	}
	#endif

	#ifdef CONFIG_PM
	static const struct dev_pm_ops sdhci_pxav3_pmops = {
	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume)
	SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend,
	sdhci_pxav3_runtime_resume, NULL)
	};

	#define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops)

	#else
	#define SDHCI_PXAV3_PMOPS NULL
	#endif

	static struct platform_driver sdhci_pxav3_driver = {
	.driver = {
	.name = "sdhci-pxav3",
	#ifdef CONFIG_OF
	.of_match_table = sdhci_pxav3_of_match,
	#endif
	.owner = THIS_MODULE,
	.pm = SDHCI_PXAV3_PMOPS,
	},
	.probe = sdhci_pxav3_probe,
	.remove = sdhci_pxav3_remove,
	};

	module_platform_driver(sdhci_pxav3_driver);

	MODULE_DESCRIPTION("SDHCI driver for pxav3");
	MODULE_AUTHOR("Marvell International Ltd.");
	MODULE_LICENSE("GPL v2");