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

 /*
  * Freescale eSDHC controller driver.
  *
  * Copyright (c) 2007, 2010, 2012 Freescale Semiconductor, Inc.
  * Copyright (c) 2009 MontaVista Software, Inc.
  *
  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  *	    Anton Vorontsov <avorontsov@ru.mvista.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or (at
  * your option) any later version.
  */

 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/mmc/host.h>
 #include "sdhci-pltfm.h"
 #include "sdhci-esdhc.h"

 #define VENDOR_V_22	0x12
 #define VENDOR_V_23	0x13
 static u32 esdhc_readl(struct sdhci_host *host, int reg)
 {
 	u32 ret;

 	ret = in_be32(host->ioaddr + reg);
 	/*
 	 * The bit of ADMA flag in eSDHC is not compatible with standard
 	 * SDHC register, so set fake flag SDHCI_CAN_DO_ADMA2 when ADMA is
 	 * supported by eSDHC.
 	 * And for many FSL eSDHC controller, the reset value of field
 	 * SDHCI_CAN_DO_ADMA1 is one, but some of them can't support ADMA,
 	 * only these vendor version is greater than 2.2/0x12 support ADMA.
 	 * For FSL eSDHC, must aligned 4-byte, so use 0xFC to read the
 	 * the verdor version number, oxFE is SDHCI_HOST_VERSION.
 	 */
 	if ((reg == SDHCI_CAPABILITIES) && (ret & SDHCI_CAN_DO_ADMA1)) {
 		u32 tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
 		tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
 		if (tmp > VENDOR_V_22)
 			ret |= SDHCI_CAN_DO_ADMA2;
 	}

 	return ret;
 }

 static u16 esdhc_readw(struct sdhci_host *host, int reg)
 {
 	u16 ret;
 	int base = reg & ~0x3;
 	int shift = (reg & 0x2) * 8;

 	if (unlikely(reg == SDHCI_HOST_VERSION))
 		ret = in_be32(host->ioaddr + base) & 0xffff;
 	else
 		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
 	return ret;
 }

 static u8 esdhc_readb(struct sdhci_host *host, int reg)
 {
 	int base = reg & ~0x3;
 	int shift = (reg & 0x3) * 8;
 	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;

 	/*
 	 * "DMA select" locates at offset 0x28 in SD specification, but on
 	 * P5020 or P3041, it locates at 0x29.
 	 */
 	if (reg == SDHCI_HOST_CONTROL) {
 		u32 dma_bits;

 		dma_bits = in_be32(host->ioaddr + reg);
 		/* DMA select is 22,23 bits in Protocol Control Register */
 		dma_bits = (dma_bits >> 5) & SDHCI_CTRL_DMA_MASK;

 		/* fixup the result */
 		ret &= ~SDHCI_CTRL_DMA_MASK;
 		ret |= dma_bits;
 	}

 	return ret;
 }

 static void esdhc_writel(struct sdhci_host *host, u32 val, int reg)
 {
 	/*
 	 * Enable IRQSTATEN[BGESEN] is just to set IRQSTAT[BGE]
 	 * when SYSCTL[RSTD]) is set for some special operations.
 	 * No any impact other operation.
 	 */
 	if (reg == SDHCI_INT_ENABLE)
 		val |= SDHCI_INT_BLK_GAP;
 	sdhci_be32bs_writel(host, val, reg);
 }

 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
 {
 	if (reg == SDHCI_BLOCK_SIZE) {
 		/*
 		 * Two last DMA bits are reserved, and first one is used for
 		 * non-standard blksz of 4096 bytes that we don't support
 		 * yet. So clear the DMA boundary bits.
 		 */
 		val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
 	}
 	sdhci_be32bs_writew(host, val, reg);
 }

 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
 {
 	/*
 	 * "DMA select" location is offset 0x28 in SD specification, but on
 	 * P5020 or P3041, it's located at 0x29.
 	 */
 	if (reg == SDHCI_HOST_CONTROL) {
 		u32 dma_bits;

 		/*
 		 * If host control register is not standard, exit
 		 * this function
 		 */
 		if (host->quirks2 & SDHCI_QUIRK2_BROKEN_HOST_CONTROL)
 			return;

 		/* DMA select is 22,23 bits in Protocol Control Register */
 		dma_bits = (val & SDHCI_CTRL_DMA_MASK) << 5;
 		clrsetbits_be32(host->ioaddr + reg , SDHCI_CTRL_DMA_MASK << 5,
 			dma_bits);
 		val &= ~SDHCI_CTRL_DMA_MASK;
 		val |= in_be32(host->ioaddr + reg) & SDHCI_CTRL_DMA_MASK;
 	}

 	/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
 	if (reg == SDHCI_HOST_CONTROL)
 		val &= ~ESDHC_HOST_CONTROL_RES;
 	sdhci_be32bs_writeb(host, val, reg);
 }

 /*
  * For Abort or Suspend after Stop at Block Gap, ignore the ADMA
  * error(IRQSTAT[ADMAE]) if both Transfer Complete(IRQSTAT[TC])
  * and Block Gap Event(IRQSTAT[BGE]) are also set.
  * For Continue, apply soft reset for data(SYSCTL[RSTD]);
  * and re-issue the entire read transaction from beginning.
  */
 static void esdhci_of_adma_workaround(struct sdhci_host *host, u32 intmask)
 {
 	u32 tmp;
 	bool applicable;
 	dma_addr_t dmastart;
 	dma_addr_t dmanow;

 	tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
 	tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;

 	applicable = (intmask & SDHCI_INT_DATA_END) &&
 		(intmask & SDHCI_INT_BLK_GAP) &&
 		(tmp == VENDOR_V_23);
 	if (!applicable)
 		return;

 	host->data->error = 0;
 	dmastart = sg_dma_address(host->data->sg);
 	dmanow = dmastart + host->data->bytes_xfered;
 	/*
 	 * Force update to the next DMA block boundary.
 	 */
 	dmanow = (dmanow & ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
 		SDHCI_DEFAULT_BOUNDARY_SIZE;
 	host->data->bytes_xfered = dmanow - dmastart;
 	sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
 }

 static int esdhc_of_enable_dma(struct sdhci_host *host)
 {
 	setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
 	return 0;
 }

 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

 	return pltfm_host->clock;
 }

 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

 	return pltfm_host->clock / 256 / 16;
 }

 static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	int pre_div = 1;
 	int div = 1;
 	u32 temp;

 	host->mmc->actual_clock = 0;

 	if (clock == 0)
 		return;

 	/* Workaround to start pre_div at 2 for VNN < VENDOR_V_23 */
 	temp = esdhc_readw(host, SDHCI_HOST_VERSION);
 	temp = (temp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
 	if (temp < VENDOR_V_23)
 		pre_div = 2;

 	/* Workaround to reduce the clock frequency for p1010 esdhc */
 	if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
 		if (clock > 20000000)
 			clock -= 5000000;
 		if (clock > 40000000)
 			clock -= 5000000;
 	}

 	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
 	temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
 		| ESDHC_CLOCK_MASK);
 	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);

 	while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
 		pre_div *= 2;

 	while (host->max_clk / pre_div / div > clock && div < 16)
 		div++;

 	dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
 		clock, host->max_clk / pre_div / div);
 	host->mmc->actual_clock = host->max_clk / pre_div / div;
 	pre_div >>= 1;
 	div--;

 	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
 	temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
 		| (div << ESDHC_DIVIDER_SHIFT)
 		| (pre_div << ESDHC_PREDIV_SHIFT));
 	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
 	mdelay(1);
 }

 static void esdhc_of_platform_init(struct sdhci_host *host)
 {
 	u32 vvn;

 	vvn = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
 	vvn = (vvn & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
 	if (vvn == VENDOR_V_22)
 		host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;

 	if (vvn > VENDOR_V_22)
 		host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
 }

 static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
 {
 	u32 ctrl;

 	switch (width) {
 	case MMC_BUS_WIDTH_8:
 		ctrl = ESDHC_CTRL_8BITBUS;
 		break;

 	case MMC_BUS_WIDTH_4:
 		ctrl = ESDHC_CTRL_4BITBUS;
 		break;

 	default:
 		ctrl = 0;
 		break;
 	}

 	clrsetbits_be32(host->ioaddr + SDHCI_HOST_CONTROL,
 			ESDHC_CTRL_BUSWIDTH_MASK, ctrl);
 }

 static void esdhc_reset(struct sdhci_host *host, u8 mask)
 {
 	sdhci_reset(host, mask);

 	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 }

 static const struct sdhci_ops sdhci_esdhc_ops = {
 	.read_l = esdhc_readl,
 	.read_w = esdhc_readw,
 	.read_b = esdhc_readb,
 	.write_l = esdhc_writel,
 	.write_w = esdhc_writew,
 	.write_b = esdhc_writeb,
 	.set_clock = esdhc_of_set_clock,
 	.enable_dma = esdhc_of_enable_dma,
 	.get_max_clock = esdhc_of_get_max_clock,
 	.get_min_clock = esdhc_of_get_min_clock,
 	.platform_init = esdhc_of_platform_init,
 	.adma_workaround = esdhci_of_adma_workaround,
 	.set_bus_width = esdhc_pltfm_set_bus_width,
 	.reset = esdhc_reset,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 };

 #ifdef CONFIG_PM

 static u32 esdhc_proctl;
 static int esdhc_of_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);

 	esdhc_proctl = sdhci_be32bs_readl(host, SDHCI_HOST_CONTROL);

 	return sdhci_suspend_host(host);
 }

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

 	if (ret == 0) {
 		/* Isn't this already done by sdhci_resume_host() ? --rmk */
 		esdhc_of_enable_dma(host);
 		sdhci_be32bs_writel(host, esdhc_proctl, SDHCI_HOST_CONTROL);
 	}

 	return ret;
 }

 static const struct dev_pm_ops esdhc_pmops = {
 	.suspend	= esdhc_of_suspend,
 	.resume		= esdhc_of_resume,
 };
 #define ESDHC_PMOPS (&esdhc_pmops)
 #else
 #define ESDHC_PMOPS NULL
 #endif

 static const struct sdhci_pltfm_data sdhci_esdhc_pdata = {
 	/*
 	 * card detection could be handled via GPIO
 	 * eSDHC cannot support End Attribute in NOP ADMA descriptor
 	 */
 	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
 		| SDHCI_QUIRK_NO_CARD_NO_RESET
 		| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 	.ops = &sdhci_esdhc_ops,
 };

 static int sdhci_esdhc_probe(struct platform_device *pdev)
 {
 	struct sdhci_host *host;
 	struct device_node *np;
 	int ret;

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

 	sdhci_get_of_property(pdev);

 	np = pdev->dev.of_node;
 	if (of_device_is_compatible(np, "fsl,p5040-esdhc") ||
 	    of_device_is_compatible(np, "fsl,p5020-esdhc") ||
 	    of_device_is_compatible(np, "fsl,p4080-esdhc") ||
 	    of_device_is_compatible(np, "fsl,p1020-esdhc") ||
 	    of_device_is_compatible(np, "fsl,t1040-esdhc"))
 		host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;

 	if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
 		/*
 		 * Freescale messed up with P2020 as it has a non-standard
 		 * host control register
 		 */
 		host->quirks2 |= SDHCI_QUIRK2_BROKEN_HOST_CONTROL;
 	}

 	/* call to generic mmc_of_parse to support additional capabilities */
 	ret = mmc_of_parse(host->mmc);
 	if (ret)
 		goto err;

 	mmc_of_parse_voltage(np, &host->ocr_mask);

 	ret = sdhci_add_host(host);
 	if (ret)
 		goto err;

 	return 0;
  err:
 	sdhci_pltfm_free(pdev);
 	return ret;
 }

 static const struct of_device_id sdhci_esdhc_of_match[] = {
 	{ .compatible = "fsl,mpc8379-esdhc" },
 	{ .compatible = "fsl,mpc8536-esdhc" },
 	{ .compatible = "fsl,esdhc" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);

 static struct platform_driver sdhci_esdhc_driver = {
 	.driver = {
 		.name = "sdhci-esdhc",
 		.of_match_table = sdhci_esdhc_of_match,
 		.pm = ESDHC_PMOPS,
 	},
 	.probe = sdhci_esdhc_probe,
 	.remove = sdhci_pltfm_unregister,
 };

 module_platform_driver(sdhci_esdhc_driver);

 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* Freescale eSDHC controller driver.
	*
	* Copyright (c) 2007, 2010, 2012 Freescale Semiconductor, Inc.
	* Copyright (c) 2009 MontaVista Software, Inc.
	*
	* Authors: Xiaobo Xie <X.Xie@freescale.com>
	* Anton Vorontsov <avorontsov@ru.mvista.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*/

	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/mmc/host.h>
	#include "sdhci-pltfm.h"
	#include "sdhci-esdhc.h"

	#define VENDOR_V_22 0x12
	#define VENDOR_V_23 0x13
	static u32 esdhc_readl(struct sdhci_host *host, int reg)
	{
	u32 ret;

	ret = in_be32(host->ioaddr + reg);
	/*
	* The bit of ADMA flag in eSDHC is not compatible with standard
	* SDHC register, so set fake flag SDHCI_CAN_DO_ADMA2 when ADMA is
	* supported by eSDHC.
	* And for many FSL eSDHC controller, the reset value of field
	* SDHCI_CAN_DO_ADMA1 is one, but some of them can't support ADMA,
	* only these vendor version is greater than 2.2/0x12 support ADMA.
	* For FSL eSDHC, must aligned 4-byte, so use 0xFC to read the
	* the verdor version number, oxFE is SDHCI_HOST_VERSION.
	*/
	if ((reg == SDHCI_CAPABILITIES) && (ret & SDHCI_CAN_DO_ADMA1)) {
	u32 tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
	tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
	if (tmp > VENDOR_V_22)
	ret \|= SDHCI_CAN_DO_ADMA2;
	}

	return ret;
	}

	static u16 esdhc_readw(struct sdhci_host *host, int reg)
	{
	u16 ret;
	int base = reg & ~0x3;
	int shift = (reg & 0x2) * 8;

	if (unlikely(reg == SDHCI_HOST_VERSION))
	ret = in_be32(host->ioaddr + base) & 0xffff;
	else
	ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
	return ret;
	}

	static u8 esdhc_readb(struct sdhci_host *host, int reg)
	{
	int base = reg & ~0x3;
	int shift = (reg & 0x3) * 8;
	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;

	/*
	* "DMA select" locates at offset 0x28 in SD specification, but on
	* P5020 or P3041, it locates at 0x29.
	*/
	if (reg == SDHCI_HOST_CONTROL) {
	u32 dma_bits;

	dma_bits = in_be32(host->ioaddr + reg);
	/* DMA select is 22,23 bits in Protocol Control Register */
	dma_bits = (dma_bits >> 5) & SDHCI_CTRL_DMA_MASK;

	/* fixup the result */
	ret &= ~SDHCI_CTRL_DMA_MASK;
	ret \|= dma_bits;
	}

	return ret;
	}

	static void esdhc_writel(struct sdhci_host *host, u32 val, int reg)
	{
	/*
	* Enable IRQSTATEN[BGESEN] is just to set IRQSTAT[BGE]
	* when SYSCTL[RSTD]) is set for some special operations.
	* No any impact other operation.
	*/
	if (reg == SDHCI_INT_ENABLE)
	val \|= SDHCI_INT_BLK_GAP;
	sdhci_be32bs_writel(host, val, reg);
	}

	static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
	{
	if (reg == SDHCI_BLOCK_SIZE) {
	/*
	* Two last DMA bits are reserved, and first one is used for
	* non-standard blksz of 4096 bytes that we don't support
	* yet. So clear the DMA boundary bits.
	*/
	val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
	}
	sdhci_be32bs_writew(host, val, reg);
	}

	static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
	{
	/*
	* "DMA select" location is offset 0x28 in SD specification, but on
	* P5020 or P3041, it's located at 0x29.
	*/
	if (reg == SDHCI_HOST_CONTROL) {
	u32 dma_bits;

	/*
	* If host control register is not standard, exit
	* this function
	*/
	if (host->quirks2 & SDHCI_QUIRK2_BROKEN_HOST_CONTROL)
	return;

	/* DMA select is 22,23 bits in Protocol Control Register */
	dma_bits = (val & SDHCI_CTRL_DMA_MASK) << 5;
	clrsetbits_be32(host->ioaddr + reg , SDHCI_CTRL_DMA_MASK << 5,
	dma_bits);
	val &= ~SDHCI_CTRL_DMA_MASK;
	val \|= in_be32(host->ioaddr + reg) & SDHCI_CTRL_DMA_MASK;
	}

	/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
	if (reg == SDHCI_HOST_CONTROL)
	val &= ~ESDHC_HOST_CONTROL_RES;
	sdhci_be32bs_writeb(host, val, reg);
	}

	/*
	* For Abort or Suspend after Stop at Block Gap, ignore the ADMA
	* error(IRQSTAT[ADMAE]) if both Transfer Complete(IRQSTAT[TC])
	* and Block Gap Event(IRQSTAT[BGE]) are also set.
	* For Continue, apply soft reset for data(SYSCTL[RSTD]);
	* and re-issue the entire read transaction from beginning.
	*/
	static void esdhci_of_adma_workaround(struct sdhci_host *host, u32 intmask)
	{
	u32 tmp;
	bool applicable;
	dma_addr_t dmastart;
	dma_addr_t dmanow;

	tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
	tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;

	applicable = (intmask & SDHCI_INT_DATA_END) &&
	(intmask & SDHCI_INT_BLK_GAP) &&
	(tmp == VENDOR_V_23);
	if (!applicable)
	return;

	host->data->error = 0;
	dmastart = sg_dma_address(host->data->sg);
	dmanow = dmastart + host->data->bytes_xfered;
	/*
	* Force update to the next DMA block boundary.
	*/
	dmanow = (dmanow & ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
	SDHCI_DEFAULT_BOUNDARY_SIZE;
	host->data->bytes_xfered = dmanow - dmastart;
	sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
	}

	static int esdhc_of_enable_dma(struct sdhci_host *host)
	{
	setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
	return 0;
	}

	static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	return pltfm_host->clock;
	}

	static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
	{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	return pltfm_host->clock / 256 / 16;
	}

	static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
	{
	int pre_div = 1;
	int div = 1;
	u32 temp;

	host->mmc->actual_clock = 0;

	if (clock == 0)
	return;

	/* Workaround to start pre_div at 2 for VNN < VENDOR_V_23 */
	temp = esdhc_readw(host, SDHCI_HOST_VERSION);
	temp = (temp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
	if (temp < VENDOR_V_23)
	pre_div = 2;

	/* Workaround to reduce the clock frequency for p1010 esdhc */
	if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
	if (clock > 20000000)
	clock -= 5000000;
	if (clock > 40000000)
	clock -= 5000000;
	}

	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
	temp &= ~(ESDHC_CLOCK_IPGEN \| ESDHC_CLOCK_HCKEN \| ESDHC_CLOCK_PEREN
	\| ESDHC_CLOCK_MASK);
	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);

	while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
	pre_div *= 2;

	while (host->max_clk / pre_div / div > clock && div < 16)
	div++;

	dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
	clock, host->max_clk / pre_div / div);
	host->mmc->actual_clock = host->max_clk / pre_div / div;
	pre_div >>= 1;
	div--;

	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
	temp \|= (ESDHC_CLOCK_IPGEN \| ESDHC_CLOCK_HCKEN \| ESDHC_CLOCK_PEREN
	\| (div << ESDHC_DIVIDER_SHIFT)
	\| (pre_div << ESDHC_PREDIV_SHIFT));
	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
	mdelay(1);
	}

	static void esdhc_of_platform_init(struct sdhci_host *host)
	{
	u32 vvn;

	vvn = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
	vvn = (vvn & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
	if (vvn == VENDOR_V_22)
	host->quirks2 \|= SDHCI_QUIRK2_HOST_NO_CMD23;

	if (vvn > VENDOR_V_22)
	host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
	}

	static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
	{
	u32 ctrl;

	switch (width) {
	case MMC_BUS_WIDTH_8:
	ctrl = ESDHC_CTRL_8BITBUS;
	break;

	case MMC_BUS_WIDTH_4:
	ctrl = ESDHC_CTRL_4BITBUS;
	break;

	default:
	ctrl = 0;
	break;
	}

	clrsetbits_be32(host->ioaddr + SDHCI_HOST_CONTROL,
	ESDHC_CTRL_BUSWIDTH_MASK, ctrl);
	}

	static void esdhc_reset(struct sdhci_host *host, u8 mask)
	{
	sdhci_reset(host, mask);

	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
	}

	static const struct sdhci_ops sdhci_esdhc_ops = {
	.read_l = esdhc_readl,
	.read_w = esdhc_readw,
	.read_b = esdhc_readb,
	.write_l = esdhc_writel,
	.write_w = esdhc_writew,
	.write_b = esdhc_writeb,
	.set_clock = esdhc_of_set_clock,
	.enable_dma = esdhc_of_enable_dma,
	.get_max_clock = esdhc_of_get_max_clock,
	.get_min_clock = esdhc_of_get_min_clock,
	.platform_init = esdhc_of_platform_init,
	.adma_workaround = esdhci_of_adma_workaround,
	.set_bus_width = esdhc_pltfm_set_bus_width,
	.reset = esdhc_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	};

	#ifdef CONFIG_PM

	static u32 esdhc_proctl;
	static int esdhc_of_suspend(struct device *dev)
	{
	struct sdhci_host *host = dev_get_drvdata(dev);

	esdhc_proctl = sdhci_be32bs_readl(host, SDHCI_HOST_CONTROL);

	return sdhci_suspend_host(host);
	}

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

	if (ret == 0) {
	/* Isn't this already done by sdhci_resume_host() ? --rmk */
	esdhc_of_enable_dma(host);
	sdhci_be32bs_writel(host, esdhc_proctl, SDHCI_HOST_CONTROL);
	}

	return ret;
	}

	static const struct dev_pm_ops esdhc_pmops = {
	.suspend = esdhc_of_suspend,
	.resume = esdhc_of_resume,
	};
	#define ESDHC_PMOPS (&esdhc_pmops)
	#else
	#define ESDHC_PMOPS NULL
	#endif

	static const struct sdhci_pltfm_data sdhci_esdhc_pdata = {
	/*
	* card detection could be handled via GPIO
	* eSDHC cannot support End Attribute in NOP ADMA descriptor
	*/
	.quirks = ESDHC_DEFAULT_QUIRKS \| SDHCI_QUIRK_BROKEN_CARD_DETECTION
	\| SDHCI_QUIRK_NO_CARD_NO_RESET
	\| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
	.ops = &sdhci_esdhc_ops,
	};

	static int sdhci_esdhc_probe(struct platform_device *pdev)
	{
	struct sdhci_host *host;
	struct device_node *np;
	int ret;

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

	sdhci_get_of_property(pdev);

	np = pdev->dev.of_node;
	if (of_device_is_compatible(np, "fsl,p5040-esdhc") \|\|
	of_device_is_compatible(np, "fsl,p5020-esdhc") \|\|
	of_device_is_compatible(np, "fsl,p4080-esdhc") \|\|
	of_device_is_compatible(np, "fsl,p1020-esdhc") \|\|
	of_device_is_compatible(np, "fsl,t1040-esdhc"))
	host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;

	if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
	/*
	* Freescale messed up with P2020 as it has a non-standard
	* host control register
	*/
	host->quirks2 \|= SDHCI_QUIRK2_BROKEN_HOST_CONTROL;
	}

	/* call to generic mmc_of_parse to support additional capabilities */
	ret = mmc_of_parse(host->mmc);
	if (ret)
	goto err;

	mmc_of_parse_voltage(np, &host->ocr_mask);

	ret = sdhci_add_host(host);
	if (ret)
	goto err;

	return 0;
	err:
	sdhci_pltfm_free(pdev);
	return ret;
	}

	static const struct of_device_id sdhci_esdhc_of_match[] = {
	{ .compatible = "fsl,mpc8379-esdhc" },
	{ .compatible = "fsl,mpc8536-esdhc" },
	{ .compatible = "fsl,esdhc" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);

	static struct platform_driver sdhci_esdhc_driver = {
	.driver = {
	.name = "sdhci-esdhc",
	.of_match_table = sdhci_esdhc_of_match,
	.pm = ESDHC_PMOPS,
	},
	.probe = sdhci_esdhc_probe,
	.remove = sdhci_pltfm_unregister,
	};

	module_platform_driver(sdhci_esdhc_driver);

	MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
	MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
	"Anton Vorontsov <avorontsov@ru.mvista.com>");
	MODULE_LICENSE("GPL v2");