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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.4 * http://www.samsung.com/5 * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>6 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>7 * Author: Krzysztof Kozlowski <krzk@kernel.org>8 *9 * Samsung Exynos SoC Adaptive Supply Voltage support10 */11 12#include <linux/cpu.h>13#include <linux/device.h>14#include <linux/energy_model.h>15#include <linux/errno.h>16#include <linux/of.h>17#include <linux/pm_opp.h>18#include <linux/regmap.h>19#include <linux/soc/samsung/exynos-chipid.h>20 21#include "exynos-asv.h"22#include "exynos5422-asv.h"23 24#define MHZ 1000000U25 26static int exynos_asv_update_cpu_opps(struct exynos_asv *asv,27 struct device *cpu)28{29 struct exynos_asv_subsys *subsys = NULL;30 struct dev_pm_opp *opp;31 unsigned int opp_freq;32 int i;33 34 for (i = 0; i < ARRAY_SIZE(asv->subsys); i++) {35 if (of_device_is_compatible(cpu->of_node,36 asv->subsys[i].cpu_dt_compat)) {37 subsys = &asv->subsys[i];38 break;39 }40 }41 if (!subsys)42 return -EINVAL;43 44 for (i = 0; i < subsys->table.num_rows; i++) {45 unsigned int new_volt, volt;46 int ret;47 48 opp_freq = exynos_asv_opp_get_frequency(subsys, i);49 50 opp = dev_pm_opp_find_freq_exact(cpu, opp_freq * MHZ, true);51 if (IS_ERR(opp)) {52 dev_info(asv->dev, "cpu%d opp%d, freq: %u missing\n",53 cpu->id, i, opp_freq);54 55 continue;56 }57 58 volt = dev_pm_opp_get_voltage(opp);59 new_volt = asv->opp_get_voltage(subsys, i, volt);60 dev_pm_opp_put(opp);61 62 if (new_volt == volt)63 continue;64 65 ret = dev_pm_opp_adjust_voltage(cpu, opp_freq * MHZ,66 new_volt, new_volt, new_volt);67 if (ret < 0)68 dev_err(asv->dev,69 "Failed to adjust OPP %u Hz/%u uV for cpu%d\n",70 opp_freq, new_volt, cpu->id);71 else72 dev_dbg(asv->dev,73 "Adjusted OPP %u Hz/%u -> %u uV, cpu%d\n",74 opp_freq, volt, new_volt, cpu->id);75 }76 77 return 0;78}79 80static int exynos_asv_update_opps(struct exynos_asv *asv)81{82 struct opp_table *last_opp_table = NULL;83 struct device *cpu;84 int ret, cpuid;85 86 for_each_possible_cpu(cpuid) {87 struct opp_table *opp_table;88 89 cpu = get_cpu_device(cpuid);90 if (!cpu)91 continue;92 93 opp_table = dev_pm_opp_get_opp_table(cpu);94 if (IS_ERR(opp_table))95 continue;96 97 if (!last_opp_table || opp_table != last_opp_table) {98 last_opp_table = opp_table;99 100 ret = exynos_asv_update_cpu_opps(asv, cpu);101 if (!ret) {102 /*103 * Update EM power values since OPP104 * voltage values may have changed.105 */106 em_dev_update_chip_binning(cpu);107 } else {108 dev_err(asv->dev, "Couldn't udate OPPs for cpu%d\n",109 cpuid);110 }111 }112 113 dev_pm_opp_put_opp_table(opp_table);114 }115 116 return 0;117}118 119int exynos_asv_init(struct device *dev, struct regmap *regmap)120{121 int (*probe_func)(struct exynos_asv *asv);122 struct exynos_asv *asv;123 struct device *cpu_dev;124 u32 product_id = 0;125 int ret, i;126 127 asv = devm_kzalloc(dev, sizeof(*asv), GFP_KERNEL);128 if (!asv)129 return -ENOMEM;130 131 asv->chipid_regmap = regmap;132 asv->dev = dev;133 ret = regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID,134 &product_id);135 if (ret < 0) {136 dev_err(dev, "Cannot read revision from ChipID: %d\n", ret);137 return -ENODEV;138 }139 140 switch (product_id & EXYNOS_MASK) {141 case 0xE5422000:142 probe_func = exynos5422_asv_init;143 break;144 default:145 dev_dbg(dev, "No ASV support for this SoC\n");146 devm_kfree(dev, asv);147 return 0;148 }149 150 cpu_dev = get_cpu_device(0);151 ret = dev_pm_opp_get_opp_count(cpu_dev);152 if (ret < 0)153 return -EPROBE_DEFER;154 155 ret = of_property_read_u32(dev->of_node, "samsung,asv-bin",156 &asv->of_bin);157 if (ret < 0)158 asv->of_bin = -EINVAL;159 160 for (i = 0; i < ARRAY_SIZE(asv->subsys); i++)161 asv->subsys[i].asv = asv;162 163 ret = probe_func(asv);164 if (ret < 0)165 return ret;166 167 return exynos_asv_update_opps(asv);168}169