/*
 * linux/arch/arm/mach-omap2/hsmmc.c
 *
 * Copyright (C) 2007-2008 Texas Instruments
 * Copyright (C) 2008 Nokia Corporation
 * Author: Texas Instruments
 *
 * 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.
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/platform_data/gpio-omap.h>

#include "soc.h"
#include "omap_device.h"
#include "omap-pm.h"

#include "mux.h"
#include "mmc.h"
#include "hsmmc.h"
#include "control.h"

#if defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE)

static u16 control_pbias_offset;
static u16 control_devconf1_offset;
static u16 control_mmc1;

#define HSMMC_NAME_LEN	9

#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)

static int hsmmc_get_context_loss(struct device *dev)
{
	return omap_pm_get_dev_context_loss_count(dev);
}

#else
#define hsmmc_get_context_loss NULL
#endif

static void omap_hsmmc1_before_set_reg(struct device *dev, int slot,
				  int power_on, int vdd)
{
	u32 reg, prog_io;
	struct omap_mmc_platform_data *mmc = dev->platform_data;

	if (mmc->slots[0].remux)
		mmc->slots[0].remux(dev, slot, power_on);

	/*
	 * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
	 * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
	 * 1.8V and 3.0V modes, controlled by the PBIAS register.
	 *
	 * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
	 * is most naturally TWL VSIM; those pins also use PBIAS.
	 *
	 * FIXME handle VMMC1A as needed ...
	 */
	if (power_on) {
		if (cpu_is_omap2430()) {
			reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
			if ((1 << vdd) >= MMC_VDD_30_31)
				reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
			else
				reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
			omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
		}

		if (mmc->slots[0].internal_clock) {
			reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
			reg |= OMAP2_MMCSDIO1ADPCLKISEL;
			omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
		}

		reg = omap_ctrl_readl(control_pbias_offset);
		if (cpu_is_omap3630()) {
			/* Set MMC I/O to 52Mhz */
			prog_io = omap_ctrl_readl(OMAP343X_CONTROL_PROG_IO1);
			prog_io |= OMAP3630_PRG_SDMMC1_SPEEDCTRL;
			omap_ctrl_writel(prog_io, OMAP343X_CONTROL_PROG_IO1);
		} else {
			reg |= OMAP2_PBIASSPEEDCTRL0;
		}
		reg &= ~OMAP2_PBIASLITEPWRDNZ0;
		omap_ctrl_writel(reg, control_pbias_offset);
	} else {
		reg = omap_ctrl_readl(control_pbias_offset);
		reg &= ~OMAP2_PBIASLITEPWRDNZ0;
		omap_ctrl_writel(reg, control_pbias_offset);
	}
}

static void omap_hsmmc1_after_set_reg(struct device *dev, int slot,
				 int power_on, int vdd)
{
	u32 reg;

	/* 100ms delay required for PBIAS configuration */
	msleep(100);

	if (power_on) {
		reg = omap_ctrl_readl(control_pbias_offset);
		reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
		if ((1 << vdd) <= MMC_VDD_165_195)
			reg &= ~OMAP2_PBIASLITEVMODE0;
		else
			reg |= OMAP2_PBIASLITEVMODE0;
		omap_ctrl_writel(reg, control_pbias_offset);
	} else {
		reg = omap_ctrl_readl(control_pbias_offset);
		reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
			OMAP2_PBIASLITEVMODE0);
		omap_ctrl_writel(reg, control_pbias_offset);
	}
}

static void omap4_hsmmc1_before_set_reg(struct device *dev, int slot,
				  int power_on, int vdd)
{
	u32 reg;

	/*
	 * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
	 * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
	 * 1.8V and 3.0V modes, controlled by the PBIAS register.
	 */
	reg = omap4_ctrl_pad_readl(control_pbias_offset);
	reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
		OMAP4_MMC1_PWRDNZ_MASK |
		OMAP4_MMC1_PBIASLITE_VMODE_MASK);
	omap4_ctrl_pad_writel(reg, control_pbias_offset);
}