1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2024 Linaro Ltd.
15 #include "ipa.h"
23  * DOC: IPA Power Management
25  * The IPA hardware is enabled when the IPA core clock and all the
26  * interconnects (buses) it depends on are enabled.  Runtime power
27  * management is used to determine whether the core clock and
28  * interconnects are enabled, and if not in use to be suspended
31  * The core clock currently runs at a fixed clock rate when enabled,
38  * struct ipa_power - IPA power management information
39  * @dev:		IPA device pointer
40  * @core:		IPA core clock
53 /* Initialize interconnects required for IPA operation */
62 	interconnect = &power->interconnect[0];  in ipa_interconnect_init()
63 	for (i = 0; i < power->interconnect_count; i++) {  in ipa_interconnect_init()
64 		/* interconnect->path is filled in by of_icc_bulk_get() */  in ipa_interconnect_init()
65 		interconnect->name = data->name;  in ipa_interconnect_init()
66 		interconnect->avg_bw = data->average_bandwidth;  in ipa_interconnect_init()
67 		interconnect->peak_bw = data->peak_bandwidth;  in ipa_interconnect_init()
72 	ret = of_icc_bulk_get(power->dev, power->interconnect_count,  in ipa_interconnect_init()
73 			      power->interconnect);  in ipa_interconnect_init()
78 	icc_bulk_disable(power->interconnect_count, power->interconnect);  in ipa_interconnect_init()
80 	/* Set the bandwidth values to be used when enabled */  in ipa_interconnect_init()
81 	ret = icc_bulk_set_bw(power->interconnect_count, power->interconnect);  in ipa_interconnect_init()
83 		icc_bulk_put(power->interconnect_count, power->interconnect);  in ipa_interconnect_init()
91 	icc_bulk_put(power->interconnect_count, power->interconnect);  in ipa_interconnect_exit()
94 /* Enable IPA power, enabling interconnects and the core clock */
95 static int ipa_power_enable(struct ipa *ipa)  in ipa_power_enable()  argument
97 	struct ipa_power *power = ipa->power;  in ipa_power_enable()
100 	ret = icc_bulk_enable(power->interconnect_count, power->interconnect);  in ipa_power_enable()
104 	ret = clk_prepare_enable(power->core);  in ipa_power_enable()
106 		dev_err(power->dev, "error %d enabling core clock\n", ret);  in ipa_power_enable()
107 		icc_bulk_disable(power->interconnect_count,  in ipa_power_enable()
108 				 power->interconnect);  in ipa_power_enable()
115 static void ipa_power_disable(struct ipa *ipa)  in ipa_power_disable()  argument
117 	struct ipa_power *power = ipa->power;  in ipa_power_disable()
119 	clk_disable_unprepare(power->core);  in ipa_power_disable()
121 	icc_bulk_disable(power->interconnect_count, power->interconnect);  in ipa_power_disable()
126 	struct ipa *ipa = dev_get_drvdata(dev);  in ipa_runtime_suspend()  local
129 	if (ipa->setup_complete) {  in ipa_runtime_suspend()
130 		ipa_endpoint_suspend(ipa);  in ipa_runtime_suspend()
131 		gsi_suspend(&ipa->gsi);  in ipa_runtime_suspend()
134 	ipa_power_disable(ipa);  in ipa_runtime_suspend()
141 	struct ipa *ipa = dev_get_drvdata(dev);  in ipa_runtime_resume()  local
144 	ret = ipa_power_enable(ipa);  in ipa_runtime_resume()
149 	if (ipa->setup_complete) {  in ipa_runtime_resume()
150 		gsi_resume(&ipa->gsi);  in ipa_runtime_resume()
151 		ipa_endpoint_resume(ipa);  in ipa_runtime_resume()
159 	struct ipa *ipa = dev_get_drvdata(dev);  in ipa_suspend()  local
162 	 * be re-enabled until the matching _enable call in  in ipa_suspend()
167 	 * irq wake. If wakeup is enabled for the IPA then the IRQ  in ipa_suspend()
170 	ipa_interrupt_irq_disable(ipa);  in ipa_suspend()
177 	struct ipa *ipa = dev_get_drvdata(dev);  in ipa_resume()  local
182 	/* Now that PM runtime is enabled again it's safe  in ipa_resume()
186 	ipa_interrupt_irq_enable(ipa);  in ipa_resume()
191 /* Return the current IPA core clock rate */
192 u32 ipa_core_clock_rate(struct ipa *ipa)  in ipa_core_clock_rate()  argument
194 	return ipa->power ? (u32)clk_get_rate(ipa->power->core) : 0;  in ipa_core_clock_rate()
199 	struct qmp *qmp = qmp_get(power->dev);  in ipa_power_retention_init()
202 		if (PTR_ERR(qmp) == -EPROBE_DEFER)  in ipa_power_retention_init()
203 			return -EPROBE_DEFER;  in ipa_power_retention_init()
208 	power->qmp = qmp;  in ipa_power_retention_init()
215 	qmp_put(power->qmp);  in ipa_power_retention_exit()
216 	power->qmp = NULL;  in ipa_power_retention_exit()
220 void ipa_power_retention(struct ipa *ipa, bool enable)  in ipa_power_retention()  argument
223 	struct ipa_power *power = ipa->power;  in ipa_power_retention()
226 	if (!power->qmp)  in ipa_power_retention()
229 	ret = qmp_send(power->qmp, fmt, enable ? '1' : '0');  in ipa_power_retention()
231 		dev_err(power->dev, "error %d sending QMP %sable request\n",  in ipa_power_retention()
235 /* Initialize IPA power management */
246 		return dev_err_cast_probe(dev, clk, "error getting core clock\n");  in ipa_power_init()
248 	ret = clk_set_rate(clk, data->core_clock_rate);  in ipa_power_init()
250 		dev_err(dev, "error %d setting core clock rate to %u\n",  in ipa_power_init()
251 			ret, data->core_clock_rate);  in ipa_power_init()
255 	size = struct_size(power, interconnect, data->interconnect_count);  in ipa_power_init()
258 		ret = -ENOMEM;  in ipa_power_init()
261 	power->dev = dev;  in ipa_power_init()
262 	power->core = clk;  in ipa_power_init()
263 	power->interconnect_count = data->interconnect_count;  in ipa_power_init()
265 	ret = ipa_interconnect_init(power, data->interconnect_data);  in ipa_power_init()
292 	struct device *dev = power->dev;  in ipa_power_exit()
293 	struct clk *clk = power->core;  in ipa_power_exit()