diff options
Diffstat (limited to 'arch/arm/mach-omap2/omap_twl.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap_twl.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_twl.c b/arch/arm/mach-omap2/omap_twl.c new file mode 100644 index 000000000000..0a8e74e3e811 --- /dev/null +++ b/arch/arm/mach-omap2/omap_twl.c @@ -0,0 +1,339 @@ +/** + * 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; +} |