/*
 * Copyright 2010 MontaVista Software, LLC.
 *
 * Author: 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 version 2 as
 * published by the Free Software Foundation.
 */

#ifndef _DRIVERS_MMC_SDHCI_PLTFM_H
#define _DRIVERS_MMC_SDHCI_PLTFM_H

#include <linux/clk.h>
#include <linux/platform_device.h>
#include "sdhci.h"

struct sdhci_pltfm_data {
	const struct sdhci_ops *ops;
	unsigned int quirks;
	unsigned int quirks2;
};

struct sdhci_pltfm_host {
	struct clk *clk;
	void *priv; /* to handle quirks across io-accessor calls */

	/* migrate from sdhci_of_host */
	unsigned int clock;
	u16 xfer_mode_shadow;
	enum endian_mode {
		LITTLE_ENDIAN_MODE,
		BIG_ENDIAN_MODE,
	} endian_mode;

	unsigned long private[0] ____cacheline_aligned;
};

#ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
/*
 * These accessors are designed for big endian hosts doing I/O to
 * little endian controllers incorporating a 32-bit hardware byte swapper.
 */
static inline void sdhci_clrsetbits(struct sdhci_host *host, u32 mask,
				    u32 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	void __iomem *base = host->ioaddr + (reg & ~0x3);
	u32 shift = (reg & 0x3) * 8;

	if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
		iowrite32be(((ioread32be(base) & ~(mask << shift)) |
			    (val << shift)), base);
	else
		iowrite32(((ioread32(base) & ~(mask << shift)) |
			  (val << shift)), base);
}

static inline u32 sdhci_32bs_readl(struct sdhci_host *host, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
		return ioread32be(host->ioaddr + reg);
	else
		return ioread32(host->ioaddr + reg);
}

static inline u16 sdhci_32bs_readw(struct sdhci_host *host, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
		return ioread16be(host->ioaddr + (reg ^ 0x2));
	else
		return ioread16(host->ioaddr + (reg ^ 0x2));
}

static inline u8 sdhci_32bs_readb(struct sdhci_host *host, int reg)
{
	return ioread8(host->ioaddr + (reg ^ 0x3));
}

static inline void sdhci_32bs_writel(struct sdhci_host *host,
		u32 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
		iowrite32be(val, host->ioaddr + reg);
	else
		iowrite32(val, host->ioaddr + reg);
}

static inline void sdhci_32bs_writew(struct sdhci_host *host,
				       u16 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	switch (reg) {
	case SDHCI_TRANSFER_MODE:
		/*
		 * Postpone this write, we must do it together with a
		 * command write that is down below.
		 */
		pltfm_host->xfer_mode_shadow = val;
		return;
	case SDHCI_COMMAND:
		if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
			iowrite32be(val << 16 | pltfm_host->xfer_mode_shadow,
				    host->ioaddr + SDHCI_TRANSFER_MODE);
		else
			iowrite32(val << 16 | pltfm_host->xfer_mode_shadow,
				  host->ioaddr + SDHCI_TRANSFER_MODE);
		return;
	}
	sdhci_clrsetbits(host, 0xffff, val, reg);
}

static inline void sdhci_32bs_writeb(struct sdhci_host *host, u8 val, int reg)
{
	sdhci_clrsetbits(host, 0xff, val, reg);
}
#endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */

extern void sdhci_get_of_property(struct platform_device *pdev);

extern struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
					  const struct sdhci_pltfm_data *pdata,
					  size_t priv_size);
extern void sdhci_pltfm_free(struct platform_device *pdev);

extern int sdhci_pltfm_register(struct platform_device *pdev,
				const struct sdhci_pltfm_data *pdata,
				size_t priv_size);
extern int sdhci_pltfm_unregister(struct platform_device *pdev);

extern unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host);

static inline void *sdhci_pltfm_priv(struct sdhci_pltfm_host *host)
{
	return (void *)host->private;
}

#ifdef CONFIG_PM
extern const struct dev_pm_ops sdhci_pltfm_pmops;
#define SDHCI_PLTFM_PMOPS (&sdhci_pltfm_pmops)
#else
#define SDHCI_PLTFM_PMOPS NULL
#endif

#endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */