forked from Minki/linux
00bd228ea9
VC code now provides a table of pre-calculated I2C setup parameters, which will be used based on the capacitance value calculated for the I2C trace on the PCB. A default trace length of 6.3cm is used unless board defines its own value during init. The parameters set will be the I2C internal pull setup and the I2C timing parameters for high speed use mode. Full speed mode is not supported as of now. Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
313 lines
8.8 KiB
C
313 lines
8.8 KiB
C
/**
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* OMAP and TWL PMIC specific intializations.
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*
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* Copyright (C) 2010 Texas Instruments Incorporated.
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* Thara Gopinath
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* Copyright (C) 2009 Texas Instruments Incorporated.
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* Nishanth Menon
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* Copyright (C) 2009 Nokia Corporation
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/i2c/twl.h>
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#include "voltage.h"
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#include "pm.h"
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#define OMAP3_SRI2C_SLAVE_ADDR 0x12
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#define OMAP3_VDD_MPU_SR_CONTROL_REG 0x00
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#define OMAP3_VDD_CORE_SR_CONTROL_REG 0x01
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#define OMAP3_VP_CONFIG_ERROROFFSET 0x00
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#define OMAP3_VP_VSTEPMIN_VSTEPMIN 0x1
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#define OMAP3_VP_VSTEPMAX_VSTEPMAX 0x04
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#define OMAP3_VP_VLIMITTO_TIMEOUT_US 200
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#define OMAP4_SRI2C_SLAVE_ADDR 0x12
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#define OMAP4_VDD_MPU_SR_VOLT_REG 0x55
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#define OMAP4_VDD_MPU_SR_CMD_REG 0x56
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#define OMAP4_VDD_IVA_SR_VOLT_REG 0x5B
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#define OMAP4_VDD_IVA_SR_CMD_REG 0x5C
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#define OMAP4_VDD_CORE_SR_VOLT_REG 0x61
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#define OMAP4_VDD_CORE_SR_CMD_REG 0x62
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#define OMAP4_VP_CONFIG_ERROROFFSET 0x00
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#define OMAP4_VP_VSTEPMIN_VSTEPMIN 0x01
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#define OMAP4_VP_VSTEPMAX_VSTEPMAX 0x04
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#define OMAP4_VP_VLIMITTO_TIMEOUT_US 200
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static bool is_offset_valid;
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static u8 smps_offset;
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/*
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* Flag to ensure Smartreflex bit in TWL
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* being cleared in board file is not overwritten.
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*/
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static bool __initdata twl_sr_enable_autoinit;
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#define TWL4030_DCDC_GLOBAL_CFG 0x06
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#define REG_SMPS_OFFSET 0xE0
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#define SMARTREFLEX_ENABLE BIT(3)
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static unsigned long twl4030_vsel_to_uv(const u8 vsel)
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{
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return (((vsel * 125) + 6000)) * 100;
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}
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static u8 twl4030_uv_to_vsel(unsigned long uv)
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{
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return DIV_ROUND_UP(uv - 600000, 12500);
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}
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static unsigned long twl6030_vsel_to_uv(const u8 vsel)
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{
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/*
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* In TWL6030 depending on the value of SMPS_OFFSET
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* efuse register the voltage range supported in
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* standard mode can be either between 0.6V - 1.3V or
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* 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
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* is programmed to all 0's where as starting from
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* TWL6030 ES1.1 the efuse is programmed to 1
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*/
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if (!is_offset_valid) {
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twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
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REG_SMPS_OFFSET);
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is_offset_valid = true;
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}
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if (!vsel)
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return 0;
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/*
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* There is no specific formula for voltage to vsel
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* conversion above 1.3V. There are special hardcoded
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* values for voltages above 1.3V. Currently we are
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* hardcoding only for 1.35 V which is used for 1GH OPP for
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* OMAP4430.
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*/
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if (vsel == 0x3A)
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return 1350000;
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if (smps_offset & 0x8)
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return ((((vsel - 1) * 1266) + 70900)) * 10;
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else
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return ((((vsel - 1) * 1266) + 60770)) * 10;
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}
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static u8 twl6030_uv_to_vsel(unsigned long uv)
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{
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/*
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* In TWL6030 depending on the value of SMPS_OFFSET
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* efuse register the voltage range supported in
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* standard mode can be either between 0.6V - 1.3V or
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* 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
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* is programmed to all 0's where as starting from
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* TWL6030 ES1.1 the efuse is programmed to 1
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*/
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if (!is_offset_valid) {
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twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
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REG_SMPS_OFFSET);
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is_offset_valid = true;
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}
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if (!uv)
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return 0x00;
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/*
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* There is no specific formula for voltage to vsel
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* conversion above 1.3V. There are special hardcoded
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* values for voltages above 1.3V. Currently we are
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* hardcoding only for 1.35 V which is used for 1GH OPP for
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* OMAP4430.
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*/
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if (uv > twl6030_vsel_to_uv(0x39)) {
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if (uv == 1350000)
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return 0x3A;
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pr_err("%s:OUT OF RANGE! non mapped vsel for %ld Vs max %ld\n",
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__func__, uv, twl6030_vsel_to_uv(0x39));
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return 0x3A;
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}
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if (smps_offset & 0x8)
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return DIV_ROUND_UP(uv - 709000, 12660) + 1;
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else
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return DIV_ROUND_UP(uv - 607700, 12660) + 1;
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}
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static struct omap_voltdm_pmic omap3_mpu_pmic = {
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.slew_rate = 4000,
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.step_size = 12500,
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.vp_erroroffset = OMAP3_VP_CONFIG_ERROROFFSET,
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.vp_vstepmin = OMAP3_VP_VSTEPMIN_VSTEPMIN,
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.vp_vstepmax = OMAP3_VP_VSTEPMAX_VSTEPMAX,
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.vddmin = 600000,
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.vddmax = 1450000,
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.vp_timeout_us = OMAP3_VP_VLIMITTO_TIMEOUT_US,
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.i2c_slave_addr = OMAP3_SRI2C_SLAVE_ADDR,
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.volt_reg_addr = OMAP3_VDD_MPU_SR_CONTROL_REG,
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.i2c_high_speed = true,
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.vsel_to_uv = twl4030_vsel_to_uv,
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.uv_to_vsel = twl4030_uv_to_vsel,
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};
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static struct omap_voltdm_pmic omap3_core_pmic = {
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.slew_rate = 4000,
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.step_size = 12500,
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.vp_erroroffset = OMAP3_VP_CONFIG_ERROROFFSET,
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.vp_vstepmin = OMAP3_VP_VSTEPMIN_VSTEPMIN,
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.vp_vstepmax = OMAP3_VP_VSTEPMAX_VSTEPMAX,
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.vddmin = 600000,
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.vddmax = 1450000,
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.vp_timeout_us = OMAP3_VP_VLIMITTO_TIMEOUT_US,
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.i2c_slave_addr = OMAP3_SRI2C_SLAVE_ADDR,
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.volt_reg_addr = OMAP3_VDD_CORE_SR_CONTROL_REG,
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.i2c_high_speed = true,
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.vsel_to_uv = twl4030_vsel_to_uv,
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.uv_to_vsel = twl4030_uv_to_vsel,
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};
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static struct omap_voltdm_pmic omap4_mpu_pmic = {
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.slew_rate = 4000,
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.step_size = 12660,
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.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
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.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
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.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
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.vddmin = 0,
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.vddmax = 2100000,
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.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
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.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
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.volt_reg_addr = OMAP4_VDD_MPU_SR_VOLT_REG,
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.cmd_reg_addr = OMAP4_VDD_MPU_SR_CMD_REG,
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.i2c_high_speed = true,
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.i2c_pad_load = 3,
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.vsel_to_uv = twl6030_vsel_to_uv,
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.uv_to_vsel = twl6030_uv_to_vsel,
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};
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static struct omap_voltdm_pmic omap4_iva_pmic = {
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.slew_rate = 4000,
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.step_size = 12660,
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.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
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.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
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.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
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.vddmin = 0,
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.vddmax = 2100000,
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.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
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.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
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.volt_reg_addr = OMAP4_VDD_IVA_SR_VOLT_REG,
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.cmd_reg_addr = OMAP4_VDD_IVA_SR_CMD_REG,
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.i2c_high_speed = true,
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.i2c_pad_load = 3,
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.vsel_to_uv = twl6030_vsel_to_uv,
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.uv_to_vsel = twl6030_uv_to_vsel,
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};
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static struct omap_voltdm_pmic omap4_core_pmic = {
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.slew_rate = 4000,
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.step_size = 12660,
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.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
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.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
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.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
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.vddmin = 0,
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.vddmax = 2100000,
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.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
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.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
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.volt_reg_addr = OMAP4_VDD_CORE_SR_VOLT_REG,
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.cmd_reg_addr = OMAP4_VDD_CORE_SR_CMD_REG,
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.i2c_pad_load = 3,
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.vsel_to_uv = twl6030_vsel_to_uv,
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.uv_to_vsel = twl6030_uv_to_vsel,
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};
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int __init omap4_twl_init(void)
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{
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struct voltagedomain *voltdm;
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if (!cpu_is_omap44xx())
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return -ENODEV;
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voltdm = voltdm_lookup("mpu");
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omap_voltage_register_pmic(voltdm, &omap4_mpu_pmic);
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voltdm = voltdm_lookup("iva");
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omap_voltage_register_pmic(voltdm, &omap4_iva_pmic);
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voltdm = voltdm_lookup("core");
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omap_voltage_register_pmic(voltdm, &omap4_core_pmic);
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return 0;
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}
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int __init omap3_twl_init(void)
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{
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struct voltagedomain *voltdm;
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if (!cpu_is_omap34xx())
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return -ENODEV;
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/*
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* The smartreflex bit on twl4030 specifies if the setting of voltage
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* is done over the I2C_SR path. Since this setting is independent of
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* the actual usage of smartreflex AVS module, we enable TWL SR bit
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* by default irrespective of whether smartreflex AVS module is enabled
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* on the OMAP side or not. This is because without this bit enabled,
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* the voltage scaling through vp forceupdate/bypass mechanism of
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* voltage scaling will not function on TWL over I2C_SR.
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*/
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if (!twl_sr_enable_autoinit)
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omap3_twl_set_sr_bit(true);
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voltdm = voltdm_lookup("mpu_iva");
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omap_voltage_register_pmic(voltdm, &omap3_mpu_pmic);
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voltdm = voltdm_lookup("core");
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omap_voltage_register_pmic(voltdm, &omap3_core_pmic);
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return 0;
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}
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/**
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* omap3_twl_set_sr_bit() - Set/Clear SR bit on TWL
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* @enable: enable SR mode in twl or not
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*
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* If 'enable' is true, enables Smartreflex bit on TWL 4030 to make sure
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* voltage scaling through OMAP SR works. Else, the smartreflex bit
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* on twl4030 is cleared as there are platforms which use OMAP3 and T2 but
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* use Synchronized Scaling Hardware Strategy (ENABLE_VMODE=1) and Direct
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* Strategy Software Scaling Mode (ENABLE_VMODE=0), for setting the voltages,
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* in those scenarios this bit is to be cleared (enable = false).
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*
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* Returns 0 on success, error is returned if I2C read/write fails.
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*/
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int __init omap3_twl_set_sr_bit(bool enable)
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{
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u8 temp;
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int ret;
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if (twl_sr_enable_autoinit)
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pr_warning("%s: unexpected multiple calls\n", __func__);
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ret = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &temp,
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TWL4030_DCDC_GLOBAL_CFG);
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if (ret)
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goto err;
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if (enable)
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temp |= SMARTREFLEX_ENABLE;
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else
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temp &= ~SMARTREFLEX_ENABLE;
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ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, temp,
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TWL4030_DCDC_GLOBAL_CFG);
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if (!ret) {
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twl_sr_enable_autoinit = true;
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return 0;
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}
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err:
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pr_err("%s: Error access to TWL4030 (%d)\n", __func__, ret);
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return ret;
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}
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