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1// SPDX-License-Identifier: GPL-2.02 3/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.4 * Copyright (C) 2018-2024 Linaro Ltd.5 */6 7#include <linux/clk.h>8#include <linux/device.h>9#include <linux/interconnect.h>10#include <linux/pm.h>11#include <linux/pm_runtime.h>12 13#include "linux/soc/qcom/qcom_aoss.h"14 15#include "ipa.h"16#include "ipa_data.h"17#include "ipa_endpoint.h"18#include "ipa_interrupt.h"19#include "ipa_modem.h"20#include "ipa_power.h"21 22/**23 * DOC: IPA Power Management24 *25 * The IPA hardware is enabled when the IPA core clock and all the26 * interconnects (buses) it depends on are enabled. Runtime power27 * management is used to determine whether the core clock and28 * interconnects are enabled, and if not in use to be suspended29 * automatically.30 *31 * The core clock currently runs at a fixed clock rate when enabled,32 * an all interconnects use a fixed average and peak bandwidth.33 */34 35#define IPA_AUTOSUSPEND_DELAY 500 /* milliseconds */36 37/**38 * struct ipa_power - IPA power management information39 * @dev: IPA device pointer40 * @core: IPA core clock41 * @qmp: QMP handle for AOSS communication42 * @interconnect_count: Number of elements in interconnect[]43 * @interconnect: Interconnect array44 */45struct ipa_power {46 struct device *dev;47 struct clk *core;48 struct qmp *qmp;49 u32 interconnect_count;50 struct icc_bulk_data interconnect[] __counted_by(interconnect_count);51};52 53/* Initialize interconnects required for IPA operation */54static int ipa_interconnect_init(struct ipa_power *power,55 const struct ipa_interconnect_data *data)56{57 struct icc_bulk_data *interconnect;58 int ret;59 u32 i;60 61 /* Initialize our interconnect data array for bulk operations */62 interconnect = &power->interconnect[0];63 for (i = 0; i < power->interconnect_count; i++) {64 /* interconnect->path is filled in by of_icc_bulk_get() */65 interconnect->name = data->name;66 interconnect->avg_bw = data->average_bandwidth;67 interconnect->peak_bw = data->peak_bandwidth;68 data++;69 interconnect++;70 }71 72 ret = of_icc_bulk_get(power->dev, power->interconnect_count,73 power->interconnect);74 if (ret)75 return ret;76 77 /* All interconnects are initially disabled */78 icc_bulk_disable(power->interconnect_count, power->interconnect);79 80 /* Set the bandwidth values to be used when enabled */81 ret = icc_bulk_set_bw(power->interconnect_count, power->interconnect);82 if (ret)83 icc_bulk_put(power->interconnect_count, power->interconnect);84 85 return ret;86}87 88/* Inverse of ipa_interconnect_init() */89static void ipa_interconnect_exit(struct ipa_power *power)90{91 icc_bulk_put(power->interconnect_count, power->interconnect);92}93 94/* Enable IPA power, enabling interconnects and the core clock */95static int ipa_power_enable(struct ipa *ipa)96{97 struct ipa_power *power = ipa->power;98 int ret;99 100 ret = icc_bulk_enable(power->interconnect_count, power->interconnect);101 if (ret)102 return ret;103 104 ret = clk_prepare_enable(power->core);105 if (ret) {106 dev_err(power->dev, "error %d enabling core clock\n", ret);107 icc_bulk_disable(power->interconnect_count,108 power->interconnect);109 }110 111 return ret;112}113 114/* Inverse of ipa_power_enable() */115static void ipa_power_disable(struct ipa *ipa)116{117 struct ipa_power *power = ipa->power;118 119 clk_disable_unprepare(power->core);120 121 icc_bulk_disable(power->interconnect_count, power->interconnect);122}123 124static int ipa_runtime_suspend(struct device *dev)125{126 struct ipa *ipa = dev_get_drvdata(dev);127 128 /* Endpoints aren't usable until setup is complete */129 if (ipa->setup_complete) {130 ipa_endpoint_suspend(ipa);131 gsi_suspend(&ipa->gsi);132 }133 134 ipa_power_disable(ipa);135 136 return 0;137}138 139static int ipa_runtime_resume(struct device *dev)140{141 struct ipa *ipa = dev_get_drvdata(dev);142 int ret;143 144 ret = ipa_power_enable(ipa);145 if (WARN_ON(ret < 0))146 return ret;147 148 /* Endpoints aren't usable until setup is complete */149 if (ipa->setup_complete) {150 gsi_resume(&ipa->gsi);151 ipa_endpoint_resume(ipa);152 }153 154 return 0;155}156 157static int ipa_suspend(struct device *dev)158{159 struct ipa *ipa = dev_get_drvdata(dev);160 161 /* Increment the disable depth to ensure that the IRQ won't162 * be re-enabled until the matching _enable call in163 * ipa_resume(). We do this to ensure that the interrupt164 * handler won't run whilst PM runtime is disabled.165 *166 * Note that disabling the IRQ is NOT the same as disabling167 * irq wake. If wakeup is enabled for the IPA then the IRQ168 * will still cause the system to wake up, see irq_set_irq_wake().169 */170 ipa_interrupt_irq_disable(ipa);171 172 return pm_runtime_force_suspend(dev);173}174 175static int ipa_resume(struct device *dev)176{177 struct ipa *ipa = dev_get_drvdata(dev);178 int ret;179 180 ret = pm_runtime_force_resume(dev);181 182 /* Now that PM runtime is enabled again it's safe183 * to turn the IRQ back on and process any data184 * that was received during suspend.185 */186 ipa_interrupt_irq_enable(ipa);187 188 return ret;189}190 191/* Return the current IPA core clock rate */192u32 ipa_core_clock_rate(struct ipa *ipa)193{194 return ipa->power ? (u32)clk_get_rate(ipa->power->core) : 0;195}196 197static int ipa_power_retention_init(struct ipa_power *power)198{199 struct qmp *qmp = qmp_get(power->dev);200 201 if (IS_ERR(qmp)) {202 if (PTR_ERR(qmp) == -EPROBE_DEFER)203 return -EPROBE_DEFER;204 205 /* We assume any other error means it's not defined/needed */206 qmp = NULL;207 }208 power->qmp = qmp;209 210 return 0;211}212 213static void ipa_power_retention_exit(struct ipa_power *power)214{215 qmp_put(power->qmp);216 power->qmp = NULL;217}218 219/* Control register retention on power collapse */220void ipa_power_retention(struct ipa *ipa, bool enable)221{222 static const char fmt[] = "{ class: bcm, res: ipa_pc, val: %c }";223 struct ipa_power *power = ipa->power;224 int ret;225 226 if (!power->qmp)227 return; /* Not needed on this platform */228 229 ret = qmp_send(power->qmp, fmt, enable ? '1' : '0');230 if (ret)231 dev_err(power->dev, "error %d sending QMP %sable request\n",232 ret, enable ? "en" : "dis");233}234 235/* Initialize IPA power management */236struct ipa_power *237ipa_power_init(struct device *dev, const struct ipa_power_data *data)238{239 struct ipa_power *power;240 struct clk *clk;241 size_t size;242 int ret;243 244 clk = clk_get(dev, "core");245 if (IS_ERR(clk))246 return dev_err_cast_probe(dev, clk, "error getting core clock\n");247 248 ret = clk_set_rate(clk, data->core_clock_rate);249 if (ret) {250 dev_err(dev, "error %d setting core clock rate to %u\n",251 ret, data->core_clock_rate);252 goto err_clk_put;253 }254 255 size = struct_size(power, interconnect, data->interconnect_count);256 power = kzalloc(size, GFP_KERNEL);257 if (!power) {258 ret = -ENOMEM;259 goto err_clk_put;260 }261 power->dev = dev;262 power->core = clk;263 power->interconnect_count = data->interconnect_count;264 265 ret = ipa_interconnect_init(power, data->interconnect_data);266 if (ret)267 goto err_kfree;268 269 ret = ipa_power_retention_init(power);270 if (ret)271 goto err_interconnect_exit;272 273 pm_runtime_set_autosuspend_delay(dev, IPA_AUTOSUSPEND_DELAY);274 pm_runtime_use_autosuspend(dev);275 pm_runtime_enable(dev);276 277 return power;278 279err_interconnect_exit:280 ipa_interconnect_exit(power);281err_kfree:282 kfree(power);283err_clk_put:284 clk_put(clk);285 286 return ERR_PTR(ret);287}288 289/* Inverse of ipa_power_init() */290void ipa_power_exit(struct ipa_power *power)291{292 struct device *dev = power->dev;293 struct clk *clk = power->core;294 295 pm_runtime_disable(dev);296 pm_runtime_dont_use_autosuspend(dev);297 ipa_power_retention_exit(power);298 ipa_interconnect_exit(power);299 kfree(power);300 clk_put(clk);301}302 303const struct dev_pm_ops ipa_pm_ops = {304 .suspend = ipa_suspend,305 .resume = ipa_resume,306 .runtime_suspend = ipa_runtime_suspend,307 .runtime_resume = ipa_runtime_resume,308};309