| /** |
| * 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 sucess, 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; |
| } |