/*
 * 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 <mach/hardware.h>
#include <plat/mmc.h>
#include <plat/omap-pm.h>
#include <plat/mux.h>
#include <plat/omap_device.h>

#include "mux.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


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.
	 *
	 * 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 ...
	 */
	reg = omap4_ctrl_pad_readl(control_pbias_offset);
	reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
		OMAP4_MMC1_PWRDNZ_MASK);
	omap4_ctrl_pad_writel(reg, control_pbias_offset);
}

static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
				 int power_on, int vdd)
{
	u32 reg;
	unsigned long timeout;

	if (power_on) {
		int use_3_volt_mode = !((1 << vdd) <= MMC_VDD_165_195);
		int dont_try_again = 0;
try_again:
		reg = omap4_ctrl_pad_readl(control_pbias_offset);
		reg |= OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK;
		if (!use_3_volt_mode)
			reg &= ~OMAP4_MMC1_PBIASLITE_VMODE_MASK;
		else
			reg |= OMAP4_MMC1_PBIASLITE_VMODE_MASK;
		reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
			OMAP4_MMC1_PWRDNZ_MASK);
		omap4_ctrl_pad_writel(reg, control_pbias_offset);

		timeout = jiffies + msecs_to_jiffies(5);
		do {
			reg = omap4_ctrl_pad_readl(control_pbias_offset);
			/* If we detect an error, stop immediately to handle it.
			 * Otherwise, keep going to make sure that no error
			 * shows up within our timeout
			 */
			if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK)
				break;
			usleep_range(100, 200);
		} while (!time_after(jiffies, timeout));

		if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK) {
			/* Caution : On VMODE_ERROR Power Down MMC IO */
			reg &= ~(OMAP4_MMC1_PWRDNZ_MASK);
			omap4_ctrl_pad_writel(reg, control_pbias_offset);

			if (!dont_try_again) {
				use_3_volt_mode = !use_3_volt_mode;
				pr_warn("Pbias Voltage is not the same as LDO,"
				       "reconfiguring for %sv mode.\n",
				       use_3_volt_mode ? "3" : "1.8");
				usleep_range(100, 200);
				dont_try_again = 1;
				goto try_again;
			} else {
				pr_err("Pbias Voltage is still not the same as"
				       " LDO.  Forcing shutdown\n");
			}
		}
	}
}

static void hsmmc23_before_set_reg(struct device *dev, int slot,
				   int power_on, int vdd)
{
	struct omap_mmc_platform_data *mmc = dev->platform_data;

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

	if (power_on) {
		/* Only MMC2 supports a CLKIN */
		if (mmc->slots[0].internal_clock) {
			u32 reg;

			reg = omap_ctrl_readl(control_devconf1_offset);
			reg |= OMAP2_MMCSDIO2ADPCLKISEL;
			omap_ctrl_writel(reg, control_devconf1_offset);
		}
	}
}

static int nop_mmc_set_power(struct device *dev, int slot, int power_on,
							int vdd)
{
	return 0;
}

static inline void omap_hsmmc_mux(struct omap_mmc_platform_data *mmc_controller,
			int controller_nr)
{
	if ((mmc_controller->slots[0].switch_pin > 0) && \
		(mmc_controller->slots[0].switch_pin < OMAP_MAX_GPIO_LINES))
		omap_mux_init_gpio(mmc_controller->slots[0].switch_pin,
					OMAP_PIN_INPUT_PULLUP);
	if ((mmc_controller->slots[0].gpio_wp > 0) && \
		(mmc_controller->slots[0].gpio_wp < OMAP_MAX_GPIO_LINES))
		omap_mux_init_gpio(mmc_controller->slots[0].gpio_wp,
					OMAP_PIN_INPUT_PULLUP);
	if (cpu_is_omap34xx()) {
		if (controller_nr == 0) {
			omap_mux_init_signal("sdmmc1_clk",
				OMAP_PIN_INPUT_PULLUP);
			omap_mux_init_signal("sdmmc1_cmd",
				OMAP_PIN_INPUT_PULLUP);
			omap_mux_init_signal("sdmmc1_dat0",
				OMAP_PIN_INPUT_PULLUP);
			if (mmc_controller->slots[0].caps &
				(MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
				omap_mux_init_signal("sdmmc1_dat1",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc1_dat2",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc1_dat3",
					OMAP_PIN_INPUT_PULLUP);
			}
			if (mmc_controller->slots[0].caps &
						MMC_CAP_8_BIT_DATA) {
				omap_mux_init_signal("sdmmc1_dat4",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc1_dat5",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc1_dat6",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc1_dat7",
					OMAP_PIN_INPUT_PULLUP);
			}
		}
		if (controller_nr == 1) {
			/* MMC2 */
			omap_mux_init_signal("sdmmc2_clk",
				OMAP_PIN_INPUT_PULLUP);
			omap_mux_init_signal("sdmmc2_cmd",
				OMAP_PIN_INPUT_PULLUP);
			omap_mux_init_signal("sdmmc2_dat0",
				OMAP_PIN_INPUT_PULLUP);

			/*
			 * For 8 wire configurations, Lines DAT4, 5, 6 and 7
			 * need to be muxed in the board-*.c files
			 */
			if (mmc_controller->slots[0].caps &
				(MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
				omap_mux_init_signal("sdmmc2_dat1",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc2_dat2",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc2_dat3",
					OMAP_PIN_INPUT_PULLUP);
			}
			if (mmc_controller->slots[0].caps &
							MMC_CAP_8_BIT_DATA) {
				omap_mux_init_signal("sdmmc2_dat4.sdmmc2_dat4",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc2_dat5.sdmmc2_dat5",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",
					OMAP_PIN_INPUT_PULLUP);
				omap_mux_init_signal("sdmmc2_dat7.sdmmc2_dat7",
					OMAP_PIN_INPUT_PULLUP);
			}
		}

		/*
		 * For MMC3 the pins need to be muxed in the board-*.c files
		 */
	}
}

static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
					struct omap_mmc_platform_data *mmc)
{
	char *hc_name;

	hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
	if (!hc_name) {
		pr_err("Cannot allocate memory for controller slot name\n");
		kfree(hc_name);
		return -ENOMEM;
	}

	if (c->name)
		strncpy(hc_name, c->name, HSMMC_NAME_LEN);
	else
		snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i",
								c->mmc, 1);
	mmc->slots[0].name = hc_name;
	mmc->nr_slots = 1;
	mmc->slots[0].caps = c->caps;
	mmc->slots[0].internal_clock = !c->ext_clock;
	mmc->dma_mask = 0xffffffff;
	if (cpu_is_omap44xx())
		mmc->reg_offset = OMAP4_MMC_REG_OFFSET;
	else
		mmc->reg_offset = 0;

	mmc->slots[0].switch_pin = c->gpio_cd;
	mmc->slots[0].gpio_wp = c->gpio_wp;

	mmc->slots[0].remux = c->remux;
	mmc->slots[0].init_card = c->init_card;

	if (c->cover_only)
		mmc->slots[0].cover = 1;

	if (c->nonremovable)
		mmc->slots[0].nonremovable = 1;

	if (c->power_saving)
		mmc->slots[0].power_saving = 1;

	if (c->no_off)
		mmc->slots[0].no_off = 1;

	if (c->no_off_init)
		mmc->slots[0].no_regulator_off_init = c->no_off_init;

	if (c->vcc_aux_disable_is_sleep)
		mmc->slots[0].vcc_aux_disable_is_sleep = 1;

	if (cpu_is_omap44xx()) {
		if (omap_rev() > OMAP4430_REV_ES1_0)
			mmc->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
		if (c->mmc >= 3 && c->mmc <= 5)
			mmc->slots[0].features |= HSMMC_HAS_48MHZ_MASTER_CLK;
	}

	if (c->mmc_data) {
		memcpy(&mmc->slots[0].mmc_data, c->mmc_data,
				sizeof(struct mmc_platform_data));
		mmc->slots[0].card_detect =
				(mmc_card_detect_func)c->mmc_data->status;
	}

	/*
	 * NOTE:  MMC slots should have a Vcc regulator set up.
	 * This may be from a TWL4030-family chip, another
	 * controllable regulator, or a fixed supply.
	 *
	 * temporary HACK: ocr_mask instead of fixed supply
	 */
	mmc->slots[0].ocr_mask = c->ocr_mask;

	if (cpu_is_omap3517() || cpu_is_omap3505())
		mmc->slots[0].set_power = nop_mmc_set_power;
	else
		mmc->slots[0].features |= HSMMC_HAS_PBIAS;

	if (cpu_is_omap44xx() && (omap_rev() > OMAP4430_REV_ES1_0))
		mmc->slots[0].features |= HSMMC_HAS_UPDATED_RESET;

	switch (c->mmc) {
	case 1:
		if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
			/* on-chip level shifting via PBIAS0/PBIAS1 */
			if (cpu_is_omap44xx()) {
				mmc->slots[0].before_set_reg =
						omap4_hsmmc1_before_set_reg;
				mmc->slots[0].after_set_reg =
						omap4_hsmmc1_after_set_reg;
			} else {
				mmc->slots[0].before_set_reg =
						omap_hsmmc1_before_set_reg;
				mmc->slots[0].after_set_reg =
						omap_hsmmc1_after_set_reg;
			}
		}

		/* OMAP3630 HSMMC1 supports only 4-bit */
		if (cpu_is_omap3630() &&
				(c->caps & MMC_CAP_8_BIT_DATA)) {
			c->caps &= ~MMC_CAP_8_BIT_DATA;
			c->caps |= MMC_CAP_4_BIT_DATA;
			mmc->slots[0].caps = c->caps;
		}
		break;
	case 2:
		if (c->ext_clock)
			c->transceiver = 1;
		if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {
			c->caps &= ~MMC_CAP_8_BIT_DATA;
			c->caps |= MMC_CAP_4_BIT_DATA;
		}
		/* FALLTHROUGH */
	case 3:
		if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
			/* off-chip level shifting, or none */
			mmc->slots[0].before_set_reg = hsmmc23_before_set_reg;
			mmc->slots[0].after_set_reg = NULL;
		}
		break;
	case 4:
	case 5:
		mmc->slots[0].before_set_reg = NULL;
		mmc->slots[0].after_set_reg = NULL;
		break;
	default:
		pr_err("MMC%d configuration not supported!\n", c->mmc);
		kfree(hc_name);
		return -ENODEV;
	}
	return 0;
}

static struct omap_device_pm_latency omap_hsmmc_latency[] = {
	[0] = {
		.deactivate_func = omap_device_idle_hwmods,
		.activate_func	 = omap_device_enable_hwmods,
		.flags		 = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
	},
	/*
	 * XXX There should also be an entry here to power off/on the
	 * MMC regulators/PBIAS cells, etc.
	 */
};

#define MAX_OMAP_MMC_HWMOD_NAME_LEN		16

void __init omap_init_hsmmc(struct omap2_hsmmc_info *hsmmcinfo, int ctrl_nr)
{
	struct omap_hwmod *oh;
	struct omap_device *od;
	struct omap_device_pm_latency *ohl;
	char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
	struct omap_mmc_platform_data *mmc_data;
	struct omap_mmc_dev_attr *mmc_dev_attr;
	char *name;
	int l;
	int ohl_cnt = 0;

	mmc_data = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
	if (!mmc_data) {
		pr_err("Cannot allocate memory for mmc device!\n");
		goto done;
	}

	if (omap_hsmmc_pdata_init(hsmmcinfo, mmc_data) < 0) {
		pr_err("%s fails!\n", __func__);
		goto done;
	}
	omap_hsmmc_mux(mmc_data, (ctrl_nr - 1));

	name = "omap_hsmmc";
	ohl = omap_hsmmc_latency;
	ohl_cnt = ARRAY_SIZE(omap_hsmmc_latency);

	l = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
		     "mmc%d", ctrl_nr);
	WARN(l >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
	     "String buffer overflow in MMC%d device setup\n", ctrl_nr);
	oh = omap_hwmod_lookup(oh_name);
	if (!oh) {
		pr_err("Could not look up %s\n", oh_name);
		kfree(mmc_data->slots[0].name);
		goto done;
	}

	if (oh->dev_attr != NULL) {
		mmc_dev_attr = oh->dev_attr;
		mmc_data->controller_flags = mmc_dev_attr->flags;
	}

	od = omap_device_build(name, ctrl_nr - 1, oh, mmc_data,
		sizeof(struct omap_mmc_platform_data), ohl, ohl_cnt, false);
	if (IS_ERR(od)) {
		WARN(1, "Can't build omap_device for %s:%s.\n", name, oh->name);
		kfree(mmc_data->slots[0].name);
		goto done;
	}
	/*
	 * return device handle to board setup code
	 * required to populate for regulator framework structure
	 */
	hsmmcinfo->dev = &od->pdev.dev;

done:
	kfree(mmc_data);
}

void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
{
	u32 reg;

	if (!cpu_is_omap44xx()) {
		if (cpu_is_omap2430()) {
			control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
			control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
		} else {
			control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
			control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
		}
	} else {
		control_pbias_offset =
			OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_PBIASLITE;
		control_mmc1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MMC1;
		reg = omap4_ctrl_pad_readl(control_mmc1);
		reg |= (OMAP4_SDMMC1_PUSTRENGTH_GRP0_MASK |
			OMAP4_SDMMC1_PUSTRENGTH_GRP1_MASK);
		reg &= ~(OMAP4_SDMMC1_PUSTRENGTH_GRP2_MASK |
			OMAP4_SDMMC1_PUSTRENGTH_GRP3_MASK);
		reg |= (OMAP4_SDMMC1_DR0_SPEEDCTRL_MASK |
			OMAP4_SDMMC1_DR1_SPEEDCTRL_MASK |
			OMAP4_SDMMC1_DR2_SPEEDCTRL_MASK);
		omap4_ctrl_pad_writel(reg, control_mmc1);
	}

	for (; controllers->mmc; controllers++)
		omap_init_hsmmc(controllers, controllers->mmc);

}

#endif