/*
 * 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/mmc/host.h>
#include <linux/platform_data/gpio-omap.h>
#include <linux/platform_data/hsmmc-omap.h>

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

#include "hsmmc.h"
#include "control.h"

#if IS_ENABLED(CONFIG_MMC_OMAP_HS)

static u16 control_pbias_offset;
static u16 control_devconf1_offset;

#define HSMMC_NAME_LEN	9

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

	if (mmc->remux)
		mmc->remux(dev, 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->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 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 hsmmc2_select_input_clk_src(struct omap_hsmmc_platform_data *mmc)
{
	u32 reg;

	reg = omap_ctrl_readl(control_devconf1_offset);
	if (mmc->internal_clock)
		reg |= OMAP2_MMCSDIO2ADPCLKISEL;
	else
		reg &= ~OMAP2_MMCSDIO2ADPCLKISEL;
	omap_ctrl_writel(reg, control_devconf1_offset);
}

static void hsmmc2_before_set_reg(struct device *dev, int power_on, int vdd)
{
	struct omap_hsmmc_platform_data *mmc = dev->platform_data;

	if (mmc->remux)
		mmc->remux(dev, power_on);

	if (power_on)
		hsmmc2_select_input_clk_src(mmc);
}

static int am35x_hsmmc2_set_power(struct device *dev, int power_on, int vdd)
{
	struct omap_hsmmc_platform_data *mmc = dev->platform_data;

	if (power_on)
		hsmmc2_select_input_clk_src(mmc);

	return 0;
}

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

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

	hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
	if (!hc_name) {
		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->name = hc_name;
	mmc->caps = c->caps;
	mmc->internal_clock = !c->ext_clock;
	mmc->reg_offset = 0;

	if (c->cover_only) {
		/* detect if mobile phone cover removed */
		mmc->gpio_cd = -EINVAL;
		mmc->gpio_cod = c->gpio_cd;
	} else {
		/* card detect pin on the mmc socket itself */
		mmc->gpio_cd = c->gpio_cd;
		mmc->gpio_cod = -EINVAL;
	}
	mmc->gpio_wp = c->gpio_wp;

	mmc->remux = c->remux;
	mmc->init_card = c->init_card;

	if (c->nonremovable)
		mmc->nonremovable = 1;

	/*
	 * 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
	 */
	if (soc_is_am35xx())
		mmc->ocr_mask = MMC_VDD_165_195 |
					 MMC_VDD_26_27 |
					 MMC_VDD_27_28 |
					 MMC_VDD_29_30 |
					 MMC_VDD_30_31 |
					 MMC_VDD_31_32;
	else
		mmc->ocr_mask = c->ocr_mask;

	if (!soc_is_am35xx())
		mmc->features |= HSMMC_HAS_PBIAS;

	switch (c->mmc) {
	case 1:
		if (mmc->features & HSMMC_HAS_PBIAS) {
			/* on-chip level shifting via PBIAS0/PBIAS1 */
			mmc->before_set_reg =
					omap_hsmmc1_before_set_reg;
			mmc->after_set_reg =
					omap_hsmmc1_after_set_reg;
		}

		if (soc_is_am35xx())
			mmc->set_power = nop_mmc_set_power;

		/* 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->caps = c->caps;
		}
		break;
	case 2:
		if (soc_is_am35xx())
			mmc->set_power = am35x_hsmmc2_set_power;

		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;
		}
		if (mmc->features & HSMMC_HAS_PBIAS) {
			/* off-chip level shifting, or none */
			mmc->before_set_reg = hsmmc2_before_set_reg;
			mmc->after_set_reg = NULL;
		}
		break;
	case 3:
	case 4:
	case 5:
		mmc->before_set_reg = NULL;
		mmc->after_set_reg = NULL;
		break;
	default:
		pr_err("MMC%d configuration not supported!\n", c->mmc);
		kfree(hc_name);
		return -ENODEV;
	}
	return 0;
}

static int omap_hsmmc_done;

void omap_hsmmc_late_init(struct omap2_hsmmc_info *c)
{
	struct platform_device *pdev;
	struct omap_hsmmc_platform_data *mmc_pdata;
	int res;

	if (omap_hsmmc_done != 1)
		return;

	omap_hsmmc_done++;

	for (; c->mmc; c++) {
		if (!c->deferred)
			continue;

		pdev = c->pdev;
		if (!pdev)
			continue;

		mmc_pdata = pdev->dev.platform_data;
		if (!mmc_pdata)
			continue;

		if (c->cover_only) {
			/* detect if mobile phone cover removed */
			mmc_pdata->gpio_cd = -EINVAL;
			mmc_pdata->gpio_cod = c->gpio_cd;
		} else {
			/* card detect pin on the mmc socket itself */
			mmc_pdata->gpio_cd = c->gpio_cd;
			mmc_pdata->gpio_cod = -EINVAL;
		}
		mmc_pdata->gpio_wp = c->gpio_wp;

		res = omap_device_register(pdev);
		if (res)
			pr_err("Could not late init MMC %s\n",
			       c->name);
	}
}

#define MAX_OMAP_MMC_HWMOD_NAME_LEN		16

static void __init omap_hsmmc_init_one(struct omap2_hsmmc_info *hsmmcinfo,
					int ctrl_nr)
{
	struct omap_hwmod *oh;
	struct omap_hwmod *ohs[1];
	struct omap_device *od;
	struct platform_device *pdev;
	char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
	struct omap_hsmmc_platform_data *mmc_data;
	struct omap_hsmmc_dev_attr *mmc_dev_attr;
	char *name;
	int res;

	mmc_data = kzalloc(sizeof(*mmc_data), GFP_KERNEL);
	if (!mmc_data)
		return;

	res = omap_hsmmc_pdata_init(hsmmcinfo, mmc_data);
	if (res < 0)
		goto free_mmc;

	name = "omap_hsmmc";
	res = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
		     "mmc%d", ctrl_nr);
	WARN(res >= 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);
		goto free_name;
	}
	ohs[0] = oh;
	if (oh->dev_attr != NULL) {
		mmc_dev_attr = oh->dev_attr;
		mmc_data->controller_flags = mmc_dev_attr->flags;
		/*
		 * erratum 2.1.1.128 doesn't apply if board has
		 * a transceiver is attached
		 */
		if (hsmmcinfo->transceiver)
			mmc_data->controller_flags &=
				~OMAP_HSMMC_BROKEN_MULTIBLOCK_READ;
	}

	pdev = platform_device_alloc(name, ctrl_nr - 1);
	if (!pdev) {
		pr_err("Could not allocate pdev for %s\n", name);
		goto free_name;
	}
	dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);

	od = omap_device_alloc(pdev, ohs, 1);
	if (IS_ERR(od)) {
		pr_err("Could not allocate od for %s\n", name);
		goto put_pdev;
	}

	res = platform_device_add_data(pdev, mmc_data,
			      sizeof(struct omap_hsmmc_platform_data));
	if (res) {
		pr_err("Could not add pdata for %s\n", name);
		goto put_pdev;
	}

	hsmmcinfo->pdev = pdev;

	if (hsmmcinfo->deferred)
		goto free_mmc;

	res = omap_device_register(pdev);
	if (res) {
		pr_err("Could not register od for %s\n", name);
		goto free_od;
	}

	goto free_mmc;

free_od:
	omap_device_delete(od);

put_pdev:
	platform_device_put(pdev);

free_name:
	kfree(mmc_data->name);

free_mmc:
	kfree(mmc_data);
}

void __init omap_hsmmc_init(struct omap2_hsmmc_info *controllers)
{
	if (omap_hsmmc_done)
		return;

	omap_hsmmc_done = 1;

	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;
	}

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

}

#endif