/* * OMAP3/OMAP4 Voltage Management Routines * * Author: Thara Gopinath * * Copyright (C) 2007 Texas Instruments, Inc. * Rajendra Nayak * Lesly A M * * Copyright (C) 2008, 2011 Nokia Corporation * Kalle Jokiniemi * Paul Walmsley * * Copyright (C) 2010 Texas Instruments, Inc. * Thara Gopinath * * 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 #include #include #include #include #include #include #include #include #include #include "prm-regbits-34xx.h" #include "prm-regbits-44xx.h" #include "prm44xx.h" #include "prcm44xx.h" #include "prminst44xx.h" #include "control.h" #define VOLTAGE_DIR_SIZE 16 static struct omap_vdd_info **vdd_info; /* * Number of scalable voltage domains. */ static int nr_scalable_vdd; /* XXX document */ static s16 prm_mod_offs; static s16 prm_irqst_ocp_mod_offs; static struct dentry *voltage_dir; /* Init function pointers */ static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd, unsigned long target_volt); static u32 omap3_voltage_read_reg(u16 mod, u8 offset) { return omap2_prm_read_mod_reg(mod, offset); } static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset) { omap2_prm_write_mod_reg(val, mod, offset); } static u32 omap4_voltage_read_reg(u16 mod, u8 offset) { return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, mod, offset); } static void omap4_voltage_write_reg(u32 val, u16 mod, u8 offset) { omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, mod, offset); } static int __init _config_common_vdd_data(struct omap_vdd_info *vdd) { char *sys_ck_name; struct clk *sys_ck; u32 sys_clk_speed, timeout_val, waittime; /* * XXX Clockfw should handle this, or this should be in a * struct record */ if (cpu_is_omap24xx() || cpu_is_omap34xx()) sys_ck_name = "sys_ck"; else if (cpu_is_omap44xx()) sys_ck_name = "sys_clkin_ck"; else return -EINVAL; /* * Sys clk rate is require to calculate vp timeout value and * smpswaittimemin and smpswaittimemax. */ sys_ck = clk_get(NULL, sys_ck_name); if (IS_ERR(sys_ck)) { pr_warning("%s: Could not get the sys clk to calculate" "various vdd_%s params\n", __func__, vdd->voltdm.name); return -EINVAL; } sys_clk_speed = clk_get_rate(sys_ck); clk_put(sys_ck); /* Divide to avoid overflow */ sys_clk_speed /= 1000; /* Generic voltage parameters */ vdd->curr_volt = 1200000; vdd->volt_scale = vp_forceupdate_scale_voltage; vdd->vp_enabled = false; vdd->vp_rt_data.vpconfig_erroroffset = (vdd->pmic_info->vp_erroroffset << vdd->vp_data->vp_common->vpconfig_erroroffset_shift); timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000; vdd->vp_rt_data.vlimitto_timeout = timeout_val; vdd->vp_rt_data.vlimitto_vddmin = vdd->pmic_info->vp_vddmin; vdd->vp_rt_data.vlimitto_vddmax = vdd->pmic_info->vp_vddmax; waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) * sys_clk_speed) / 1000; vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime; vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime; vdd->vp_rt_data.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin; vdd->vp_rt_data.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax; return 0; } /* Voltage debugfs support */ static int vp_volt_debug_get(void *data, u64 *val) { struct omap_vdd_info *vdd = (struct omap_vdd_info *) data; u8 vsel; if (!vdd) { pr_warning("Wrong paramater passed\n"); return -EINVAL; } vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); pr_notice("curr_vsel = %x\n", vsel); if (!vdd->pmic_info->vsel_to_uv) { pr_warning("PMIC function to convert vsel to voltage" "in uV not registerd\n"); return -EINVAL; } *val = vdd->pmic_info->vsel_to_uv(vsel); return 0; } static int nom_volt_debug_get(void *data, u64 *val) { struct omap_vdd_info *vdd = (struct omap_vdd_info *) data; if (!vdd) { pr_warning("Wrong paramater passed\n"); return -EINVAL; } *val = omap_voltage_get_nom_volt(&vdd->voltdm); return 0; } DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n"); DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL, "%llu\n"); static void vp_latch_vsel(struct omap_vdd_info *vdd) { u32 vpconfig; unsigned long uvdc; char vsel; uvdc = omap_voltage_get_nom_volt(&vdd->voltdm); if (!uvdc) { pr_warning("%s: unable to find current voltage for vdd_%s\n", __func__, vdd->voltdm.name); return; } if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) { pr_warning("%s: PMIC function to convert voltage in uV to" " vsel not registered\n", __func__); return; } vsel = vdd->pmic_info->uv_to_vsel(uvdc); vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvoltage_mask | vdd->vp_data->vp_common->vpconfig_initvdd); vpconfig |= vsel << vdd->vp_data->vp_common->vpconfig_initvoltage_shift; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* Trigger initVDD value copy to voltage processor */ vdd->write_reg((vpconfig | vdd->vp_data->vp_common->vpconfig_initvdd), prm_mod_offs, vdd->vp_data->vpconfig); /* Clear initVDD copy trigger bit */ vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); } /* Generic voltage init functions */ static void __init vp_init(struct omap_vdd_info *vdd) { u32 vp_val; if (!vdd->read_reg || !vdd->write_reg) { pr_err("%s: No read/write API for accessing vdd_%s regs\n", __func__, vdd->voltdm.name); return; } vp_val = vdd->vp_rt_data.vpconfig_erroroffset | (vdd->vp_rt_data.vpconfig_errorgain << vdd->vp_data->vp_common->vpconfig_errorgain_shift) | vdd->vp_data->vp_common->vpconfig_timeouten; vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vpconfig); vp_val = ((vdd->vp_rt_data.vstepmin_smpswaittimemin << vdd->vp_data->vp_common->vstepmin_smpswaittimemin_shift) | (vdd->vp_rt_data.vstepmin_stepmin << vdd->vp_data->vp_common->vstepmin_stepmin_shift)); vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmin); vp_val = ((vdd->vp_rt_data.vstepmax_smpswaittimemax << vdd->vp_data->vp_common->vstepmax_smpswaittimemax_shift) | (vdd->vp_rt_data.vstepmax_stepmax << vdd->vp_data->vp_common->vstepmax_stepmax_shift)); vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmax); vp_val = ((vdd->vp_rt_data.vlimitto_vddmax << vdd->vp_data->vp_common->vlimitto_vddmax_shift) | (vdd->vp_rt_data.vlimitto_vddmin << vdd->vp_data->vp_common->vlimitto_vddmin_shift) | (vdd->vp_rt_data.vlimitto_timeout << vdd->vp_data->vp_common->vlimitto_timeout_shift)); vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vlimitto); } static void __init vdd_debugfs_init(struct omap_vdd_info *vdd) { char *name; name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL); if (!name) { pr_warning("%s: Unable to allocate memory for debugfs" " directory name for vdd_%s", __func__, vdd->voltdm.name); return; } strcpy(name, "vdd_"); strcat(name, vdd->voltdm.name); vdd->debug_dir = debugfs_create_dir(name, voltage_dir); kfree(name); if (IS_ERR(vdd->debug_dir)) { pr_warning("%s: Unable to create debugfs directory for" " vdd_%s\n", __func__, vdd->voltdm.name); vdd->debug_dir = NULL; return; } (void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vpconfig_errorgain)); (void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vstepmin_smpswaittimemin)); (void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vstepmin_stepmin)); (void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vstepmax_smpswaittimemax)); (void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vstepmax_stepmax)); (void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vlimitto_vddmax)); (void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vlimitto_vddmin)); (void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir, &(vdd->vp_rt_data.vlimitto_timeout)); (void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir, (void *) vdd, &vp_volt_debug_fops); (void) debugfs_create_file("curr_nominal_volt", S_IRUGO, vdd->debug_dir, (void *) vdd, &nom_volt_debug_fops); } /* Voltage scale and accessory APIs */ static int _pre_volt_scale(struct omap_vdd_info *vdd, unsigned long target_volt, u8 *target_vsel, u8 *current_vsel) { struct omap_volt_data *volt_data; const struct omap_vc_common_data *vc_common; const struct omap_vp_common_data *vp_common; u32 vc_cmdval, vp_errgain_val; vc_common = vdd->vc_data->vc_common; vp_common = vdd->vp_data->vp_common; /* Check if suffiecient pmic info is available for this vdd */ if (!vdd->pmic_info) { pr_err("%s: Insufficient pmic info to scale the vdd_%s\n", __func__, vdd->voltdm.name); return -EINVAL; } if (!vdd->pmic_info->uv_to_vsel) { pr_err("%s: PMIC function to convert voltage in uV to" "vsel not registered. Hence unable to scale voltage" "for vdd_%s\n", __func__, vdd->voltdm.name); return -ENODATA; } if (!vdd->read_reg || !vdd->write_reg) { pr_err("%s: No read/write API for accessing vdd_%s regs\n", __func__, vdd->voltdm.name); return -EINVAL; } /* Get volt_data corresponding to target_volt */ volt_data = omap_voltage_get_voltdata(&vdd->voltdm, target_volt); if (IS_ERR(volt_data)) volt_data = NULL; *target_vsel = vdd->pmic_info->uv_to_vsel(target_volt); *current_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); /* Setting the ON voltage to the new target voltage */ vc_cmdval = vdd->read_reg(prm_mod_offs, vdd->vc_data->cmdval_reg); vc_cmdval &= ~vc_common->cmd_on_mask; vc_cmdval |= (*target_vsel << vc_common->cmd_on_shift); vdd->write_reg(vc_cmdval, prm_mod_offs, vdd->vc_data->cmdval_reg); /* Setting vp errorgain based on the voltage */ if (volt_data) { vp_errgain_val = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); vdd->vp_rt_data.vpconfig_errorgain = volt_data->vp_errgain; vp_errgain_val &= ~vp_common->vpconfig_errorgain_mask; vp_errgain_val |= vdd->vp_rt_data.vpconfig_errorgain << vp_common->vpconfig_errorgain_shift; vdd->write_reg(vp_errgain_val, prm_mod_offs, vdd->vp_data->vpconfig); } return 0; } static void _post_volt_scale(struct omap_vdd_info *vdd, unsigned long target_volt, u8 target_vsel, u8 current_vsel) { u32 smps_steps = 0, smps_delay = 0; smps_steps = abs(target_vsel - current_vsel); /* SMPS slew rate / step size. 2us added as buffer. */ smps_delay = ((smps_steps * vdd->pmic_info->step_size) / vdd->pmic_info->slew_rate) + 2; udelay(smps_delay); vdd->curr_volt = target_volt; } /* vc_bypass_scale_voltage - VC bypass method of voltage scaling */ static int vc_bypass_scale_voltage(struct omap_vdd_info *vdd, unsigned long target_volt) { u32 loop_cnt = 0, retries_cnt = 0; u32 vc_valid, vc_bypass_val_reg, vc_bypass_value; u8 target_vsel, current_vsel; int ret; ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel); if (ret) return ret; vc_valid = vdd->vc_data->vc_common->valid; vc_bypass_val_reg = vdd->vc_data->vc_common->bypass_val_reg; vc_bypass_value = (target_vsel << vdd->vc_data->vc_common->data_shift) | (vdd->pmic_info->pmic_reg << vdd->vc_data->vc_common->regaddr_shift) | (vdd->pmic_info->i2c_slave_addr << vdd->vc_data->vc_common->slaveaddr_shift); vdd->write_reg(vc_bypass_value, prm_mod_offs, vc_bypass_val_reg); vdd->write_reg(vc_bypass_value | vc_valid, prm_mod_offs, vc_bypass_val_reg); vc_bypass_value = vdd->read_reg(prm_mod_offs, vc_bypass_val_reg); /* * Loop till the bypass command is acknowledged from the SMPS. * NOTE: This is legacy code. The loop count and retry count needs * to be revisited. */ while (!(vc_bypass_value & vc_valid)) { loop_cnt++; if (retries_cnt > 10) { pr_warning("%s: Retry count exceeded\n", __func__); return -ETIMEDOUT; } if (loop_cnt > 50) { retries_cnt++; loop_cnt = 0; udelay(10); } vc_bypass_value = vdd->read_reg(prm_mod_offs, vc_bypass_val_reg); } _post_volt_scale(vdd, target_volt, target_vsel, current_vsel); return 0; } /* VP force update method of voltage scaling */ static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd, unsigned long target_volt) { u32 vpconfig; u8 target_vsel, current_vsel, prm_irqst_reg; int ret, timeout = 0; ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel); if (ret) return ret; prm_irqst_reg = vdd->vp_data->prm_irqst_data->prm_irqst_reg; /* * Clear all pending TransactionDone interrupt/status. Typical latency * is <3us */ while (timeout++ < VP_TRANXDONE_TIMEOUT) { vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status, prm_irqst_ocp_mod_offs, prm_irqst_reg); if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & vdd->vp_data->prm_irqst_data->tranxdone_status)) break; udelay(1); } if (timeout >= VP_TRANXDONE_TIMEOUT) { pr_warning("%s: vdd_%s TRANXDONE timeout exceeded." "Voltage change aborted", __func__, vdd->voltdm.name); return -ETIMEDOUT; } /* Configure for VP-Force Update */ vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvdd | vdd->vp_data->vp_common->vpconfig_forceupdate | vdd->vp_data->vp_common->vpconfig_initvoltage_mask); vpconfig |= ((target_vsel << vdd->vp_data->vp_common->vpconfig_initvoltage_shift)); vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* Trigger initVDD value copy to voltage processor */ vpconfig |= vdd->vp_data->vp_common->vpconfig_initvdd; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* Force update of voltage */ vpconfig |= vdd->vp_data->vp_common->vpconfig_forceupdate; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* * Wait for TransactionDone. Typical latency is <200us. * Depends on SMPSWAITTIMEMIN/MAX and voltage change */ timeout = 0; omap_test_timeout((vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & vdd->vp_data->prm_irqst_data->tranxdone_status), VP_TRANXDONE_TIMEOUT, timeout); if (timeout >= VP_TRANXDONE_TIMEOUT) pr_err("%s: vdd_%s TRANXDONE timeout exceeded." "TRANXDONE never got set after the voltage update\n", __func__, vdd->voltdm.name); _post_volt_scale(vdd, target_volt, target_vsel, current_vsel); /* * Disable TransactionDone interrupt , clear all status, clear * control registers */ timeout = 0; while (timeout++ < VP_TRANXDONE_TIMEOUT) { vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status, prm_irqst_ocp_mod_offs, prm_irqst_reg); if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & vdd->vp_data->prm_irqst_data->tranxdone_status)) break; udelay(1); } if (timeout >= VP_TRANXDONE_TIMEOUT) pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying" "to clear the TRANXDONE status\n", __func__, vdd->voltdm.name); vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); /* Clear initVDD copy trigger bit */ vpconfig &= ~vdd->vp_data->vp_common->vpconfig_initvdd; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* Clear force bit */ vpconfig &= ~vdd->vp_data->vp_common->vpconfig_forceupdate; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); return 0; } static void __init omap3_vfsm_init(struct omap_vdd_info *vdd) { /* * Voltage Manager FSM parameters init * XXX This data should be passed in from the board file */ vdd->write_reg(OMAP3_CLKSETUP, prm_mod_offs, OMAP3_PRM_CLKSETUP_OFFSET); vdd->write_reg(OMAP3_VOLTOFFSET, prm_mod_offs, OMAP3_PRM_VOLTOFFSET_OFFSET); vdd->write_reg(OMAP3_VOLTSETUP2, prm_mod_offs, OMAP3_PRM_VOLTSETUP2_OFFSET); } static void __init omap3_vc_init(struct omap_vdd_info *vdd) { static bool is_initialized; u8 on_vsel, onlp_vsel, ret_vsel, off_vsel; u32 vc_val; if (is_initialized) return; /* Set up the on, inactive, retention and off voltage */ on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt); onlp_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->onlp_volt); ret_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->ret_volt); off_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->off_volt); vc_val = ((on_vsel << vdd->vc_data->vc_common->cmd_on_shift) | (onlp_vsel << vdd->vc_data->vc_common->cmd_onlp_shift) | (ret_vsel << vdd->vc_data->vc_common->cmd_ret_shift) | (off_vsel << vdd->vc_data->vc_common->cmd_off_shift)); vdd->write_reg(vc_val, prm_mod_offs, vdd->vc_data->cmdval_reg); /* * Generic VC parameters init * XXX This data should be abstracted out */ vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, prm_mod_offs, OMAP3_PRM_VC_CH_CONF_OFFSET); vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, prm_mod_offs, OMAP3_PRM_VC_I2C_CFG_OFFSET); omap3_vfsm_init(vdd); is_initialized = true; } /* OMAP4 specific voltage init functions */ static void __init omap4_vc_init(struct omap_vdd_info *vdd) { static bool is_initialized; u32 vc_val; if (is_initialized) return; /* TODO: Configure setup times and CMD_VAL values*/ /* * Generic VC parameters init * XXX This data should be abstracted out */ vc_val = (OMAP4430_RAV_VDD_MPU_L_MASK | OMAP4430_CMD_VDD_MPU_L_MASK | OMAP4430_RAV_VDD_IVA_L_MASK | OMAP4430_CMD_VDD_IVA_L_MASK | OMAP4430_RAV_VDD_CORE_L_MASK | OMAP4430_CMD_VDD_CORE_L_MASK); vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_CHANNEL_OFFSET); /* XXX These are magic numbers and do not belong! */ vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT); vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET); is_initialized = true; } static void __init omap_vc_init(struct omap_vdd_info *vdd) { u32 vc_val; if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) { pr_err("%s: PMIC info requried to configure vc for" "vdd_%s not populated.Hence cannot initialize vc\n", __func__, vdd->voltdm.name); return; } if (!vdd->read_reg || !vdd->write_reg) { pr_err("%s: No read/write API for accessing vdd_%s regs\n", __func__, vdd->voltdm.name); return; } /* Set up the SMPS_SA(i2c slave address in VC */ vc_val = vdd->read_reg(prm_mod_offs, vdd->vc_data->vc_common->smps_sa_reg); vc_val &= ~vdd->vc_data->smps_sa_mask; vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_data->smps_sa_shift; vdd->write_reg(vc_val, prm_mod_offs, vdd->vc_data->vc_common->smps_sa_reg); /* Setup the VOLRA(pmic reg addr) in VC */ vc_val = vdd->read_reg(prm_mod_offs, vdd->vc_data->vc_common->smps_volra_reg); vc_val &= ~vdd->vc_data->smps_volra_mask; vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_data->smps_volra_shift; vdd->write_reg(vc_val, prm_mod_offs, vdd->vc_data->vc_common->smps_volra_reg); /* Configure the setup times */ vc_val = vdd->read_reg(prm_mod_offs, vdd->vfsm->voltsetup_reg); vc_val &= ~vdd->vfsm->voltsetup_mask; vc_val |= vdd->pmic_info->volt_setup_time << vdd->vfsm->voltsetup_shift; vdd->write_reg(vc_val, prm_mod_offs, vdd->vfsm->voltsetup_reg); if (cpu_is_omap34xx()) omap3_vc_init(vdd); else if (cpu_is_omap44xx()) omap4_vc_init(vdd); } static int __init omap_vdd_data_configure(struct omap_vdd_info *vdd) { int ret = -EINVAL; if (!vdd->pmic_info) { pr_err("%s: PMIC info requried to configure vdd_%s not" "populated.Hence cannot initialize vdd_%s\n", __func__, vdd->voltdm.name, vdd->voltdm.name); goto ovdc_out; } if (IS_ERR_VALUE(_config_common_vdd_data(vdd))) goto ovdc_out; if (cpu_is_omap34xx()) { vdd->read_reg = omap3_voltage_read_reg; vdd->write_reg = omap3_voltage_write_reg; ret = 0; } else if (cpu_is_omap44xx()) { vdd->read_reg = omap4_voltage_read_reg; vdd->write_reg = omap4_voltage_write_reg; ret = 0; } ovdc_out: return ret; } /* Public functions */ /** * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage * @voltdm: pointer to the VDD for which current voltage info is needed * * API to get the current non-auto-compensated voltage for a VDD. * Returns 0 in case of error else returns the current voltage for the VDD. */ unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return 0; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); return vdd->curr_volt; } /** * omap_vp_get_curr_volt() - API to get the current vp voltage. * @voltdm: pointer to the VDD. * * This API returns the current voltage for the specified voltage processor */ unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm) { struct omap_vdd_info *vdd; u8 curr_vsel; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return 0; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); if (!vdd->read_reg) { pr_err("%s: No read API for reading vdd_%s regs\n", __func__, voltdm->name); return 0; } curr_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); if (!vdd->pmic_info || !vdd->pmic_info->vsel_to_uv) { pr_warning("%s: PMIC function to convert vsel to voltage" "in uV not registerd\n", __func__); return 0; } return vdd->pmic_info->vsel_to_uv(curr_vsel); } /** * omap_vp_enable() - API to enable a particular VP * @voltdm: pointer to the VDD whose VP is to be enabled. * * This API enables a particular voltage processor. Needed by the smartreflex * class drivers. */ void omap_vp_enable(struct voltagedomain *voltdm) { struct omap_vdd_info *vdd; u32 vpconfig; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); if (!vdd->read_reg || !vdd->write_reg) { pr_err("%s: No read/write API for accessing vdd_%s regs\n", __func__, voltdm->name); return; } /* If VP is already enabled, do nothing. Return */ if (vdd->vp_enabled) return; vp_latch_vsel(vdd); /* Enable VP */ vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); vpconfig |= vdd->vp_data->vp_common->vpconfig_vpenable; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); vdd->vp_enabled = true; } /** * omap_vp_disable() - API to disable a particular VP * @voltdm: pointer to the VDD whose VP is to be disabled. * * This API disables a particular voltage processor. Needed by the smartreflex * class drivers. */ void omap_vp_disable(struct voltagedomain *voltdm) { struct omap_vdd_info *vdd; u32 vpconfig; int timeout; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); if (!vdd->read_reg || !vdd->write_reg) { pr_err("%s: No read/write API for accessing vdd_%s regs\n", __func__, voltdm->name); return; } /* If VP is already disabled, do nothing. Return */ if (!vdd->vp_enabled) { pr_warning("%s: Trying to disable VP for vdd_%s when" "it is already disabled\n", __func__, voltdm->name); return; } /* Disable VP */ vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); vpconfig &= ~vdd->vp_data->vp_common->vpconfig_vpenable; vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); /* * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us */ omap_test_timeout((vdd->read_reg(prm_mod_offs, vdd->vp_data->vstatus)), VP_IDLE_TIMEOUT, timeout); if (timeout >= VP_IDLE_TIMEOUT) pr_warning("%s: vdd_%s idle timedout\n", __func__, voltdm->name); vdd->vp_enabled = false; return; } /** * omap_voltage_scale_vdd() - API to scale voltage of a particular * voltage domain. * @voltdm: pointer to the VDD which is to be scaled. * @target_volt: The target voltage of the voltage domain * * This API should be called by the kernel to do the voltage scaling * for a particular voltage domain during dvfs or any other situation. */ int omap_voltage_scale_vdd(struct voltagedomain *voltdm, unsigned long target_volt) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return -EINVAL; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); if (!vdd->volt_scale) { pr_err("%s: No voltage scale API registered for vdd_%s\n", __func__, voltdm->name); return -ENODATA; } return vdd->volt_scale(vdd, target_volt); } /** * omap_voltage_reset() - Resets the voltage of a particular voltage domain * to that of the current OPP. * @voltdm: pointer to the VDD whose voltage is to be reset. * * This API finds out the correct voltage the voltage domain is supposed * to be at and resets the voltage to that level. Should be used expecially * while disabling any voltage compensation modules. */ void omap_voltage_reset(struct voltagedomain *voltdm) { unsigned long target_uvdc; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return; } target_uvdc = omap_voltage_get_nom_volt(voltdm); if (!target_uvdc) { pr_err("%s: unable to find current voltage for vdd_%s\n", __func__, voltdm->name); return; } omap_voltage_scale_vdd(voltdm, target_uvdc); } /** * omap_voltage_get_volttable() - API to get the voltage table associated with a * particular voltage domain. * @voltdm: pointer to the VDD for which the voltage table is required * @volt_data: the voltage table for the particular vdd which is to be * populated by this API * * This API populates the voltage table associated with a VDD into the * passed parameter pointer. Returns the count of distinct voltages * supported by this vdd. * */ void omap_voltage_get_volttable(struct voltagedomain *voltdm, struct omap_volt_data **volt_data) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); *volt_data = vdd->volt_data; } /** * omap_voltage_get_voltdata() - API to get the voltage table entry for a * particular voltage * @voltdm: pointer to the VDD whose voltage table has to be searched * @volt: the voltage to be searched in the voltage table * * This API searches through the voltage table for the required voltage * domain and tries to find a matching entry for the passed voltage volt. * If a matching entry is found volt_data is populated with that entry. * This API searches only through the non-compensated voltages int the * voltage table. * Returns pointer to the voltage table entry corresponding to volt on * sucess. Returns -ENODATA if no voltage table exisits for the passed voltage * domain or if there is no matching entry. */ struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm, unsigned long volt) { struct omap_vdd_info *vdd; int i; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return ERR_PTR(-EINVAL); } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); if (!vdd->volt_data) { pr_warning("%s: voltage table does not exist for vdd_%s\n", __func__, voltdm->name); return ERR_PTR(-ENODATA); } for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) { if (vdd->volt_data[i].volt_nominal == volt) return &vdd->volt_data[i]; } pr_notice("%s: Unable to match the current voltage with the voltage" "table for vdd_%s\n", __func__, voltdm->name); return ERR_PTR(-ENODATA); } /** * omap_voltage_register_pmic() - API to register PMIC specific data * @voltdm: pointer to the VDD for which the PMIC specific data is * to be registered * @pmic_info: the structure containing pmic info * * This API is to be called by the SOC/PMIC file to specify the * pmic specific info as present in omap_volt_pmic_info structure. */ int omap_voltage_register_pmic(struct voltagedomain *voltdm, struct omap_volt_pmic_info *pmic_info) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return -EINVAL; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); vdd->pmic_info = pmic_info; return 0; } /** * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory * corresponding to a voltage domain. * * @voltdm: pointer to the VDD whose debug directory is required. * * This API returns pointer to the debugfs directory corresponding * to the voltage domain. Should be used by drivers requiring to * add any debug entry for a particular voltage domain. Returns NULL * in case of error. */ struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return NULL; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); return vdd->debug_dir; } /** * omap_change_voltscale_method() - API to change the voltage scaling method. * @voltdm: pointer to the VDD whose voltage scaling method * has to be changed. * @voltscale_method: the method to be used for voltage scaling. * * This API can be used by the board files to change the method of voltage * scaling between vpforceupdate and vcbypass. The parameter values are * defined in voltage.h */ void omap_change_voltscale_method(struct voltagedomain *voltdm, int voltscale_method) { struct omap_vdd_info *vdd; if (!voltdm || IS_ERR(voltdm)) { pr_warning("%s: VDD specified does not exist!\n", __func__); return; } vdd = container_of(voltdm, struct omap_vdd_info, voltdm); switch (voltscale_method) { case VOLTSCALE_VPFORCEUPDATE: vdd->volt_scale = vp_forceupdate_scale_voltage; return; case VOLTSCALE_VCBYPASS: vdd->volt_scale = vc_bypass_scale_voltage; return; default: pr_warning("%s: Trying to change the method of voltage scaling" "to an unsupported one!\n", __func__); } } /** * omap_voltage_domain_lookup() - API to get the voltage domain pointer * @name: Name of the voltage domain * * This API looks up in the global vdd_info struct for the * existence of voltage domain . If it exists, the API returns * a pointer to the voltage domain structure corresponding to the * VDD. Else retuns error pointer. */ struct voltagedomain *omap_voltage_domain_lookup(char *name) { int i; if (!vdd_info) { pr_err("%s: Voltage driver init not yet happened.Faulting!\n", __func__); return ERR_PTR(-EINVAL); } if (!name) { pr_err("%s: No name to get the votage domain!\n", __func__); return ERR_PTR(-EINVAL); } for (i = 0; i < nr_scalable_vdd; i++) { if (!(strcmp(name, vdd_info[i]->voltdm.name))) return &vdd_info[i]->voltdm; } return ERR_PTR(-EINVAL); } /** * omap_voltage_late_init() - Init the various voltage parameters * * This API is to be called in the later stages of the * system boot to init the voltage controller and * voltage processors. */ int __init omap_voltage_late_init(void) { int i; if (!vdd_info) { pr_err("%s: Voltage driver support not added\n", __func__); return -EINVAL; } voltage_dir = debugfs_create_dir("voltage", NULL); if (IS_ERR(voltage_dir)) pr_err("%s: Unable to create voltage debugfs main dir\n", __func__); for (i = 0; i < nr_scalable_vdd; i++) { if (omap_vdd_data_configure(vdd_info[i])) continue; omap_vc_init(vdd_info[i]); vp_init(vdd_info[i]); vdd_debugfs_init(vdd_info[i]); } return 0; } /* XXX document */ int __init omap_voltage_early_init(s16 prm_mod, s16 prm_irqst_ocp_mod, struct omap_vdd_info *omap_vdd_array[], u8 omap_vdd_count) { prm_mod_offs = prm_mod; prm_irqst_ocp_mod_offs = prm_irqst_ocp_mod; vdd_info = omap_vdd_array; nr_scalable_vdd = omap_vdd_count; return 0; }