/**
* 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 "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;
/*
* Flag to ensure Smartreflex bit in TWL
* being cleared in board file is not overwritten.
*/
static bool __initdata twl_sr_enable_autoinit;
#define TWL4030_DCDC_GLOBAL_CFG 0x06
#define REG_SMPS_OFFSET 0xE0
#define SMARTREFLEX_ENABLE BIT(3)
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;
}
/*
* The smartreflex bit on twl4030 specifies if the setting of voltage
* is done over the I2C_SR path. Since this setting is independent of
* the actual usage of smartreflex AVS module, we enable TWL SR bit
* by default irrespective of whether smartreflex AVS module is enabled
* on the OMAP side or not. This is because without this bit enabled,
* the voltage scaling through vp forceupdate/bypass mechanism of
* voltage scaling will not function on TWL over I2C_SR.
*/
if (!twl_sr_enable_autoinit)
omap3_twl_set_sr_bit(true);
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;
}
/**
* omap3_twl_set_sr_bit() - Set/Clear SR bit on TWL
* @enable: enable SR mode in twl or not
*
* If 'enable' is true, enables Smartreflex bit on TWL 4030 to make sure
* voltage scaling through OMAP SR works. Else, the smartreflex bit
* on twl4030 is cleared as there are platforms which use OMAP3 and T2 but
* use Synchronized Scaling Hardware Strategy (ENABLE_VMODE=1) and Direct
* Strategy Software Scaling Mode (ENABLE_VMODE=0), for setting the voltages,
* in those scenarios this bit is to be cleared (enable = false).
*
* Returns 0 on success, error is returned if I2C read/write fails.
*/
int __init omap3_twl_set_sr_bit(bool enable)
{
u8 temp;
int ret;
if (twl_sr_enable_autoinit)
pr_warning("%s: unexpected multiple calls\n", __func__);
ret = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &temp,
TWL4030_DCDC_GLOBAL_CFG);
if (ret)
goto err;
if (enable)
temp |= SMARTREFLEX_ENABLE;
else
temp &= ~SMARTREFLEX_ENABLE;
ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, temp,
TWL4030_DCDC_GLOBAL_CFG);
if (!ret) {
twl_sr_enable_autoinit = true;
return 0;
}
err:
pr_err("%s: Error access to TWL4030 (%d)\n", __func__, ret);
return ret;
}
