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omap_twl.c

/**
 * 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 <plat/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 OMAP3430_VP1_VLIMITTO_VDDMIN      0x14
#define OMAP3430_VP1_VLIMITTO_VDDMAX      0x42
#define OMAP3430_VP2_VLIMITTO_VDDMIN      0x18
#define OMAP3430_VP2_VLIMITTO_VDDMAX      0x2c

#define OMAP3630_VP1_VLIMITTO_VDDMIN      0x18
#define OMAP3630_VP1_VLIMITTO_VDDMAX      0x3c
#define OMAP3630_VP2_VLIMITTO_VDDMIN      0x18
#define OMAP3630_VP2_VLIMITTO_VDDMAX      0x30

#define OMAP4_SRI2C_SLAVE_ADDR            0x12
#define OMAP4_VDD_MPU_SR_VOLT_REG   0x55
#define OMAP4_VDD_IVA_SR_VOLT_REG   0x5B
#define OMAP4_VDD_CORE_SR_VOLT_REG  0x61

#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

#define OMAP4_VP_MPU_VLIMITTO_VDDMIN      0xA
#define OMAP4_VP_MPU_VLIMITTO_VDDMAX      0x39
#define OMAP4_VP_IVA_VLIMITTO_VDDMIN      0xA
#define OMAP4_VP_IVA_VLIMITTO_VDDMAX      0x2D
#define OMAP4_VP_CORE_VLIMITTO_VDDMIN     0xA
#define OMAP4_VP_CORE_VLIMITTO_VDDMAX     0x28

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;
      }

      /*
       * 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) * 125) + 7000)) * 100;
      else
            return ((((vsel - 1) * 125) + 6000)) * 100;
}

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;
      }

      /*
       * 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 == 1350000)
            return 0x3A;

      if (smps_offset & 0x8)
            return DIV_ROUND_UP(uv - 700000, 12500) + 1;
      else
            return DIV_ROUND_UP(uv - 600000, 12500) + 1;
}

static struct omap_volt_pmic_info omap3_mpu_volt_info = {
      .slew_rate        = 4000,
      .step_size        = 12500,
      .on_volt          = 1200000,
      .onlp_volt        = 1000000,
      .ret_volt         = 975000,
      .off_volt         = 600000,
      .volt_setup_time  = 0xfff,
      .vp_erroroffset         = OMAP3_VP_CONFIG_ERROROFFSET,
      .vp_vstepmin            = OMAP3_VP_VSTEPMIN_VSTEPMIN,
      .vp_vstepmax            = OMAP3_VP_VSTEPMAX_VSTEPMAX,
      .vp_vddmin        = OMAP3430_VP1_VLIMITTO_VDDMIN,
      .vp_vddmax        = OMAP3430_VP1_VLIMITTO_VDDMAX,
      .vp_timeout_us          = OMAP3_VP_VLIMITTO_TIMEOUT_US,
      .i2c_slave_addr         = OMAP3_SRI2C_SLAVE_ADDR,
      .pmic_reg         = OMAP3_VDD_MPU_SR_CONTROL_REG,
      .vsel_to_uv       = twl4030_vsel_to_uv,
      .uv_to_vsel       = twl4030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap3_core_volt_info = {
      .slew_rate        = 4000,
      .step_size        = 12500,
      .on_volt                = 1200000,
      .onlp_volt              = 1000000,
      .ret_volt               = 975000,
      .off_volt               = 600000,
      .volt_setup_time        = 0xfff,
      .vp_erroroffset         = OMAP3_VP_CONFIG_ERROROFFSET,
      .vp_vstepmin            = OMAP3_VP_VSTEPMIN_VSTEPMIN,
      .vp_vstepmax            = OMAP3_VP_VSTEPMAX_VSTEPMAX,
      .vp_vddmin        = OMAP3430_VP2_VLIMITTO_VDDMIN,
      .vp_vddmax        = OMAP3430_VP2_VLIMITTO_VDDMAX,
      .vp_timeout_us          = OMAP3_VP_VLIMITTO_TIMEOUT_US,
      .i2c_slave_addr         = OMAP3_SRI2C_SLAVE_ADDR,
      .pmic_reg         = OMAP3_VDD_CORE_SR_CONTROL_REG,
      .vsel_to_uv       = twl4030_vsel_to_uv,
      .uv_to_vsel       = twl4030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_mpu_volt_info = {
      .slew_rate        = 4000,
      .step_size        = 12500,
      .on_volt          = 1350000,
      .onlp_volt        = 1350000,
      .ret_volt         = 837500,
      .off_volt         = 600000,
      .volt_setup_time  = 0,
      .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
      .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
      .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
      .vp_vddmin        = OMAP4_VP_MPU_VLIMITTO_VDDMIN,
      .vp_vddmax        = OMAP4_VP_MPU_VLIMITTO_VDDMAX,
      .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
      .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
      .pmic_reg         = OMAP4_VDD_MPU_SR_VOLT_REG,
      .vsel_to_uv       = twl6030_vsel_to_uv,
      .uv_to_vsel       = twl6030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_iva_volt_info = {
      .slew_rate        = 4000,
      .step_size        = 12500,
      .on_volt          = 1100000,
      .onlp_volt        = 1100000,
      .ret_volt         = 837500,
      .off_volt         = 600000,
      .volt_setup_time  = 0,
      .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
      .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
      .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
      .vp_vddmin        = OMAP4_VP_IVA_VLIMITTO_VDDMIN,
      .vp_vddmax        = OMAP4_VP_IVA_VLIMITTO_VDDMAX,
      .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
      .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
      .pmic_reg         = OMAP4_VDD_IVA_SR_VOLT_REG,
      .vsel_to_uv       = twl6030_vsel_to_uv,
      .uv_to_vsel       = twl6030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_core_volt_info = {
      .slew_rate        = 4000,
      .step_size        = 12500,
      .on_volt          = 1100000,
      .onlp_volt        = 1100000,
      .ret_volt         = 837500,
      .off_volt         = 600000,
      .volt_setup_time  = 0,
      .vp_erroroffset         = OMAP4_VP_CONFIG_ERROROFFSET,
      .vp_vstepmin            = OMAP4_VP_VSTEPMIN_VSTEPMIN,
      .vp_vstepmax            = OMAP4_VP_VSTEPMAX_VSTEPMAX,
      .vp_vddmin        = OMAP4_VP_CORE_VLIMITTO_VDDMIN,
      .vp_vddmax        = OMAP4_VP_CORE_VLIMITTO_VDDMAX,
      .vp_timeout_us          = OMAP4_VP_VLIMITTO_TIMEOUT_US,
      .i2c_slave_addr         = OMAP4_SRI2C_SLAVE_ADDR,
      .pmic_reg         = OMAP4_VDD_CORE_SR_VOLT_REG,
      .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 = omap_voltage_domain_lookup("mpu");
      omap_voltage_register_pmic(voltdm, &omap4_mpu_volt_info);

      voltdm = omap_voltage_domain_lookup("iva");
      omap_voltage_register_pmic(voltdm, &omap4_iva_volt_info);

      voltdm = omap_voltage_domain_lookup("core");
      omap_voltage_register_pmic(voltdm, &omap4_core_volt_info);

      return 0;
}

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

      if (!cpu_is_omap34xx())
            return -ENODEV;

      if (cpu_is_omap3630()) {
            omap3_mpu_volt_info.vp_vddmin = OMAP3630_VP1_VLIMITTO_VDDMIN;
            omap3_mpu_volt_info.vp_vddmax = OMAP3630_VP1_VLIMITTO_VDDMAX;
            omap3_core_volt_info.vp_vddmin = OMAP3630_VP2_VLIMITTO_VDDMIN;
            omap3_core_volt_info.vp_vddmax = OMAP3630_VP2_VLIMITTO_VDDMAX;
      }

      voltdm = omap_voltage_domain_lookup("mpu");
      omap_voltage_register_pmic(voltdm, &omap3_mpu_volt_info);

      voltdm = omap_voltage_domain_lookup("core");
      omap_voltage_register_pmic(voltdm, &omap3_core_volt_info);

      return 0;
}

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