/**
 * OMAP and TWL PMIC specific intializations.
 *
 * Copyright (C) 2010 Texas Instruments Incorporated.
 * Thara Gopinath
 * Copyright (C) 2009 Texas Instruments Incorporated.
 * Nishanth Menon
 * Copyright (C) 2009 Nokia Corporation
 * Paul Walmsley
 *
 * 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/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/i2c/twl.h>

#include "soc.h"
#include "voltage.h"

#include "pm.h"

#define OMAP3_SRI2C_SLAVE_ADDR          0x12
#define OMAP3_VDD_MPU_SR_CONTROL_REG    0x00
#define OMAP3_VDD_CORE_SR_CONTROL_REG   0x01
#define OMAP3_VP_CONFIG_ERROROFFSET     0x00
#define OMAP3_VP_VSTEPMIN_VSTEPMIN      0x1
#define OMAP3_VP_VSTEPMAX_VSTEPMAX      0x04
#define OMAP3_VP_VLIMITTO_TIMEOUT_US    200

#define OMAP4_SRI2C_SLAVE_ADDR          0x12
#define OMAP4_VDD_MPU_SR_VOLT_REG       0x55
#define OMAP4_VDD_MPU_SR_CMD_REG        0x56
#define OMAP4_VDD_IVA_SR_VOLT_REG       0x5B
#define OMAP4_VDD_IVA_SR_CMD_REG        0x5C
#define OMAP4_VDD_CORE_SR_VOLT_REG      0x61
#define OMAP4_VDD_CORE_SR_CMD_REG       0x62

#define OMAP4_VP_CONFIG_ERROROFFSET     0x00
#define OMAP4_VP_VSTEPMIN_VSTEPMIN      0x01
#define OMAP4_VP_VSTEPMAX_VSTEPMAX      0x04
#define OMAP4_VP_VLIMITTO_TIMEOUT_US    200

static bool is_offset_valid;
static u8 smps_offset;

#define REG_SMPS_OFFSET         0xE0

static unsigned long twl4030_vsel_to_uv(const u8 vsel)
{
        return (((vsel * 125) + 6000)) * 100;
}

static u8 twl4030_uv_to_vsel(unsigned long uv)
{
        return DIV_ROUND_UP(uv - 600000, 12500);
}

static unsigned long twl6030_vsel_to_uv(const u8 vsel)
{
        /*
         * In TWL6030 depending on the value of SMPS_OFFSET
         * efuse register the voltage range supported in
         * standard mode can be either between 0.6V - 1.3V or
         * 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
         * is programmed to all 0's where as starting from
         * TWL6030 ES1.1 the efuse is programmed to 1
         */
        if (!is_offset_valid) {
                twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
                                REG_SMPS_OFFSET);
                is_offset_valid = true;
        }

        if (!vsel)
                return 0;
        /*
         * There is no specific formula for voltage to vsel
         * conversion above 1.3V. There are special hardcoded
         * values for voltages above 1.3V. Currently we are
         * hardcoding only for 1.35 V which is used for 1GH OPP for
         * OMAP4430.
         */
        if (vsel == 0x3A)
                return 1350000;

        if (smps_offset & 0x8)
                return ((((vsel - 1) * 1266) + 70900)) * 10;
        else
                return ((((vsel - 1) * 1266) + 60770)) * 10;
}

static u8 twl6030_uv_to_vsel(unsigned long uv)
{
        /*
         * In TWL6030 depending on the value of SMPS_OFFSET
         * efuse register the voltage range supported in
         * standard mode can be either between 0.6V - 1.3V or
         * 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
         * is programmed to all 0's where as starting from
         * TWL6030 ES1.1 the efuse is programmed to 1
         */
        if (!is_offset_valid) {
                twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
                                REG_SMPS_OFFSET);
                is_offset_valid = true;
        }

        if (!uv)
                return 0x00;
        /*
         * There is no specific formula for voltage to vsel
         * conversion above 1.3V. There are special hardcoded
         * values for voltages above 1.3V. Currently we are
         * hardcoding only for 1.35 V which is used for 1GH OPP for
         * OMAP4430.
         */
        if (uv > twl6030_vsel_to_uv(0x39)) {
                if (uv == 1350000)
                        return 0x3A;
                pr_err("%s:OUT OF RANGE! non mapped vsel for %ld Vs max %ld\n",
                        __func__, uv, twl6030_vsel_to_uv(0x39));
                return 0x3A;
        }

        if (smps_offset & 0x8)
                return DIV_ROUND_UP(uv - 709000, 12660) + 1;
        else
                return DIV_ROUND_UP(uv - 607700, 12660) + 1;
}

static struct omap_voltdm_pmic omap3_mpu_pmic = {
        .slew_rate              = 4000,
        .step_size              = 12500,
        .vp_erroroffset         = OMAP3_VP_CONFIG_ERROROFFSET,
        .vp_vstepmin            = OMAP3_VP_VSTEPMIN_VSTEPMIN,
        .vp_vstepmax            = OMAP3_VP_VSTEPMAX_VSTEPMAX,
        .vddmin                 = 600000,
        .vddmax                 = 1450000,
        .vp_timeout_us          = OMAP3_VP_VLIMITTO_TIMEOUT_US,
        .i2c_slave_addr         = OMAP3_SRI2C_SLAVE_ADDR,
        .volt_reg_addr          = OMAP3_VDD_MPU_SR_CONTROL_REG,
        .i2c_high_speed         = true,
        .vsel_to_uv             = twl4030_vsel_to_uv,
        .uv_to_vsel             = twl4030_uv_to_vsel,
};

static struct omap_voltdm_pmic omap3_core_pmic = {
        .slew_rate              = 4000,
        .step_size              = 12500,
        .vp_erroroffset         = OMAP3_VP_CONFIG_ERROROFFSET,
        .vp_vstepmin            = OMAP3_VP_VSTEPMIN_VSTEPMIN,
        .vp_vstepmax            = OMAP3_VP_VSTEPMAX_VSTEPMAX,
        .vddmin                 = 600000,
        .vddmax                 = 1450000,
        .vp_timeout_us          = OMAP3_VP_VLIMITTO_TIMEOUT_US,
        .i2c_slave_addr         = OMAP3_SRI2C_SLAVE_ADDR,
        .volt_reg_addr          = OMAP3_VDD_CORE_SR_CONTROL_REG,
        .i2c_high_speed         = true,
        .vsel_to_uv             = twl4030_vsel_to_uv,
        .uv_to_vsel             = twl4030_uv_to_vsel,
};

static struct omap_voltdm_pmic omap4_mpu_pmic = {
        .slew_rate              = 4000,
        .step_size              = 12660,
        .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
        .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
        .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
        .vddmin                 = 0,
        .vddmax                 = 2100000,
        .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
        .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
        .volt_reg_addr          = OMAP4_VDD_MPU_SR_VOLT_REG,
        .cmd_reg_addr           = OMAP4_VDD_MPU_SR_CMD_REG,
        .i2c_high_speed         = true,
        .i2c_pad_load           = 3,
        .vsel_to_uv             = twl6030_vsel_to_uv,
        .uv_to_vsel             = twl6030_uv_to_vsel,
};

static struct omap_voltdm_pmic omap4_iva_pmic = {
        .slew_rate              = 4000,
        .step_size              = 12660,
        .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
        .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
        .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
        .vddmin                 = 0,
        .vddmax                 = 2100000,
        .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
        .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
        .volt_reg_addr          = OMAP4_VDD_IVA_SR_VOLT_REG,
        .cmd_reg_addr           = OMAP4_VDD_IVA_SR_CMD_REG,
        .i2c_high_speed         = true,
        .i2c_pad_load           = 3,
        .vsel_to_uv             = twl6030_vsel_to_uv,
        .uv_to_vsel             = twl6030_uv_to_vsel,
};

static struct omap_voltdm_pmic omap4_core_pmic = {
        .slew_rate              = 4000,
        .step_size              = 12660,
        .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
        .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
        .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
        .vddmin                 = 0,
        .vddmax                 = 2100000,
        .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
        .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
        .volt_reg_addr          = OMAP4_VDD_CORE_SR_VOLT_REG,
        .cmd_reg_addr           = OMAP4_VDD_CORE_SR_CMD_REG,
        .i2c_high_speed         = true,
        .i2c_pad_load           = 3,
        .vsel_to_uv             = twl6030_vsel_to_uv,
        .uv_to_vsel             = twl6030_uv_to_vsel,
};

int __init omap4_twl_init(void)
{
        struct voltagedomain *voltdm;

        if (!cpu_is_omap44xx())
                return -ENODEV;

        voltdm = voltdm_lookup("mpu");
        omap_voltage_register_pmic(voltdm, &omap4_mpu_pmic);

        voltdm = voltdm_lookup("iva");
        omap_voltage_register_pmic(voltdm, &omap4_iva_pmic);

        voltdm = voltdm_lookup("core");
        omap_voltage_register_pmic(voltdm, &omap4_core_pmic);

        return 0;
}

int __init omap3_twl_init(void)
{
        struct voltagedomain *voltdm;

        if (!cpu_is_omap34xx())
                return -ENODEV;

        voltdm = voltdm_lookup("mpu_iva");
        omap_voltage_register_pmic(voltdm, &omap3_mpu_pmic);

        voltdm = voltdm_lookup("core");
        omap_voltage_register_pmic(voltdm, &omap3_core_pmic);

        return 0;
}