// SPDX-License-Identifier: GPL-2.0-only
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/*
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* OMAP3/OMAP4 Voltage Management Routines
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*
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* Author: Thara Gopinath <thara@ti.com>
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*
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* Copyright (C) 2007 Texas Instruments, Inc.
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* Rajendra Nayak <rnayak@ti.com>
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* Lesly A M <x0080970@ti.com>
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*
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* Copyright (C) 2008, 2011 Nokia Corporation
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* Kalle Jokiniemi
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* Paul Walmsley
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Thara Gopinath <thara@ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include "common.h"
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#include "prm-regbits-34xx.h"
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#include "prm-regbits-44xx.h"
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#include "prm44xx.h"
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#include "prcm44xx.h"
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#include "prminst44xx.h"
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#include "control.h"
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#include "voltage.h"
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#include "powerdomain.h"
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#include "vc.h"
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#include "vp.h"
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static LIST_HEAD(voltdm_list);
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/* Public functions */
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/**
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* voltdm_get_voltage() - Gets the current non-auto-compensated voltage
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* @voltdm: pointer to the voltdm for which current voltage info is needed
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*
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* API to get the current non-auto-compensated voltage for a voltage domain.
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* Returns 0 in case of error else returns the current voltage.
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*/
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unsigned long voltdm_get_voltage(struct voltagedomain *voltdm)
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{
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return 0;
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}
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return voltdm->nominal_volt;
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}
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/**
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* voltdm_scale() - API to scale voltage of a particular voltage domain.
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* @voltdm: pointer to the voltage domain which is to be scaled.
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* @target_volt: The target voltage of the voltage domain
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*
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* This API should be called by the kernel to do the voltage scaling
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* for a particular voltage domain during DVFS.
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*/
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int voltdm_scale(struct voltagedomain *voltdm,
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unsigned long target_volt)
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{
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int ret, i;
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unsigned long volt = 0;
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return -EINVAL;
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}
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if (!voltdm->scale) {
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pr_err("%s: No voltage scale API registered for vdd_%s\n",
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__func__, voltdm->name);
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return -ENODATA;
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}
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if (!voltdm->volt_data) {
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pr_err("%s: No voltage data defined for vdd_%s\n",
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__func__, voltdm->name);
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return -ENODATA;
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}
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/* Adjust voltage to the exact voltage from the OPP table */
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for (i = 0; voltdm->volt_data[i].volt_nominal != 0; i++) {
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if (voltdm->volt_data[i].volt_nominal >= target_volt) {
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volt = voltdm->volt_data[i].volt_nominal;
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break;
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}
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}
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if (!volt) {
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pr_warn("%s: not scaling. OPP voltage for %lu, not found.\n",
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__func__, target_volt);
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return -EINVAL;
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}
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ret = voltdm->scale(voltdm, volt);
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if (!ret)
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voltdm->nominal_volt = volt;
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return ret;
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}
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/**
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* voltdm_reset() - Resets the voltage of a particular voltage domain
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* to that of the current OPP.
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* @voltdm: pointer to the voltage domain whose voltage is to be reset.
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*
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* This API finds out the correct voltage the voltage domain is supposed
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* to be at and resets the voltage to that level. Should be used especially
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* while disabling any voltage compensation modules.
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*/
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void voltdm_reset(struct voltagedomain *voltdm)
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{
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unsigned long target_volt;
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return;
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}
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target_volt = voltdm_get_voltage(voltdm);
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if (!target_volt) {
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pr_err("%s: unable to find current voltage for vdd_%s\n",
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__func__, voltdm->name);
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return;
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}
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voltdm_scale(voltdm, target_volt);
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}
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/**
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* omap_voltage_get_volttable() - API to get the voltage table associated with a
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* particular voltage domain.
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* @voltdm: pointer to the VDD for which the voltage table is required
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* @volt_data: the voltage table for the particular vdd which is to be
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* populated by this API
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*
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* This API populates the voltage table associated with a VDD into the
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* passed parameter pointer. Returns the count of distinct voltages
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* supported by this vdd.
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*
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*/
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void omap_voltage_get_volttable(struct voltagedomain *voltdm,
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struct omap_volt_data **volt_data)
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{
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return;
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}
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*volt_data = voltdm->volt_data;
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}
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/**
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* omap_voltage_get_voltdata() - API to get the voltage table entry for a
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* particular voltage
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* @voltdm: pointer to the VDD whose voltage table has to be searched
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* @volt: the voltage to be searched in the voltage table
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*
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* This API searches through the voltage table for the required voltage
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* domain and tries to find a matching entry for the passed voltage volt.
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* If a matching entry is found volt_data is populated with that entry.
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* This API searches only through the non-compensated voltages int the
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* voltage table.
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* Returns pointer to the voltage table entry corresponding to volt on
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* success. Returns -ENODATA if no voltage table exisits for the passed voltage
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* domain or if there is no matching entry.
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*/
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struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
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unsigned long volt)
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{
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int i;
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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if (!voltdm->volt_data) {
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pr_warn("%s: voltage table does not exist for vdd_%s\n",
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__func__, voltdm->name);
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return ERR_PTR(-ENODATA);
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}
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for (i = 0; voltdm->volt_data[i].volt_nominal != 0; i++) {
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if (voltdm->volt_data[i].volt_nominal == volt)
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return &voltdm->volt_data[i];
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}
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pr_notice("%s: Unable to match the current voltage with the voltage table for vdd_%s\n",
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__func__, voltdm->name);
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return ERR_PTR(-ENODATA);
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}
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/**
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* omap_voltage_register_pmic() - API to register PMIC specific data
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* @voltdm: pointer to the VDD for which the PMIC specific data is
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* to be registered
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* @pmic: the structure containing pmic info
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*
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* This API is to be called by the SOC/PMIC file to specify the
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* pmic specific info as present in omap_voltdm_pmic structure.
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*/
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int omap_voltage_register_pmic(struct voltagedomain *voltdm,
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struct omap_voltdm_pmic *pmic)
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{
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return -EINVAL;
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}
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voltdm->pmic = pmic;
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return 0;
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}
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/**
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* omap_voltage_late_init() - Init the various voltage parameters
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*
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* This API is to be called in the later stages of the
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* system boot to init the voltage controller and
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* voltage processors.
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*/
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int __init omap_voltage_late_init(void)
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{
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struct voltagedomain *voltdm;
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if (list_empty(&voltdm_list)) {
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pr_err("%s: Voltage driver support not added\n",
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__func__);
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return -EINVAL;
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}
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list_for_each_entry(voltdm, &voltdm_list, node) {
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struct clk *sys_ck;
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if (!voltdm->scalable)
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continue;
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sys_ck = clk_get(NULL, voltdm->sys_clk.name);
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if (IS_ERR(sys_ck)) {
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pr_warn("%s: Could not get sys clk.\n", __func__);
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return -EINVAL;
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}
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voltdm->sys_clk.rate = clk_get_rate(sys_ck);
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WARN_ON(!voltdm->sys_clk.rate);
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clk_put(sys_ck);
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if (voltdm->vc) {
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voltdm->scale = omap_vc_bypass_scale;
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omap_vc_init_channel(voltdm);
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}
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if (voltdm->vp) {
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voltdm->scale = omap_vp_forceupdate_scale;
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omap_vp_init(voltdm);
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}
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}
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return 0;
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}
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static struct voltagedomain *_voltdm_lookup(const char *name)
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{
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struct voltagedomain *voltdm, *temp_voltdm;
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voltdm = NULL;
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list_for_each_entry(temp_voltdm, &voltdm_list, node) {
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if (!strcmp(name, temp_voltdm->name)) {
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voltdm = temp_voltdm;
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break;
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}
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}
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return voltdm;
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}
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static int _voltdm_register(struct voltagedomain *voltdm)
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{
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if (!voltdm || !voltdm->name)
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return -EINVAL;
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list_add(&voltdm->node, &voltdm_list);
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pr_debug("voltagedomain: registered %s\n", voltdm->name);
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return 0;
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}
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/**
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* voltdm_lookup - look up a voltagedomain by name, return a pointer
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* @name: name of voltagedomain
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*
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* Find a registered voltagedomain by its name @name. Returns a pointer
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* to the struct voltagedomain if found, or NULL otherwise.
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*/
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struct voltagedomain *voltdm_lookup(const char *name)
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{
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struct voltagedomain *voltdm ;
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if (!name)
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return NULL;
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voltdm = _voltdm_lookup(name);
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return voltdm;
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}
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/**
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* voltdm_init - set up the voltagedomain layer
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* @voltdm_list: array of struct voltagedomain pointers to register
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*
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* Loop through the array of voltagedomains @voltdm_list, registering all
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* that are available on the current CPU. If voltdm_list is supplied
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* and not null, all of the referenced voltagedomains will be
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* registered. No return value.
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*/
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void voltdm_init(struct voltagedomain **voltdms)
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{
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struct voltagedomain **v;
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if (voltdms) {
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for (v = voltdms; *v; v++)
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_voltdm_register(*v);
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}
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}
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