drivers/cpufreq/qcom-cpufreq-hw.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
  */

 #include <linux/bitfield.h>
 #include <linux/cpufreq.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/pm_opp.h>
 #include <linux/slab.h>

 #define LUT_MAX_ENTRIES			40U
 #define LUT_SRC				GENMASK(31, 30)
 #define LUT_L_VAL			GENMASK(7, 0)
 #define LUT_CORE_COUNT			GENMASK(18, 16)
 #define LUT_VOLT			GENMASK(11, 0)
 #define LUT_ROW_SIZE			32
 #define CLK_HW_DIV			2
 #define LUT_TURBO_IND			1

 /* Register offsets */
 #define REG_ENABLE			0x0
 #define REG_FREQ_LUT			0x110
 #define REG_VOLT_LUT			0x114
 #define REG_PERF_STATE			0x920

 static unsigned long cpu_hw_rate, xo_rate;
 static struct platform_device *global_pdev;

 static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
 					unsigned int index)
 {
 	void __iomem *perf_state_reg = policy->driver_data;
 	unsigned long freq = policy->freq_table[index].frequency;

 	writel_relaxed(index, perf_state_reg);

 	arch_set_freq_scale(policy->related_cpus, freq,
 			    policy->cpuinfo.max_freq);
 	return 0;
 }

 static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
 {
 	void __iomem *perf_state_reg;
 	struct cpufreq_policy *policy;
 	unsigned int index;

 	policy = cpufreq_cpu_get_raw(cpu);
 	if (!policy)
 		return 0;

 	perf_state_reg = policy->driver_data;

 	index = readl_relaxed(perf_state_reg);
 	index = min(index, LUT_MAX_ENTRIES - 1);

 	return policy->freq_table[index].frequency;
 }

 static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
 						unsigned int target_freq)
 {
 	void __iomem *perf_state_reg = policy->driver_data;
 	int index;
 	unsigned long freq;

 	index = policy->cached_resolved_idx;
 	if (index < 0)
 		return 0;

 	writel_relaxed(index, perf_state_reg);

 	freq = policy->freq_table[index].frequency;
 	arch_set_freq_scale(policy->related_cpus, freq,
 			    policy->cpuinfo.max_freq);

 	return freq;
 }

 static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
 				    struct cpufreq_policy *policy,
 				    void __iomem *base)
 {
 	u32 data, src, lval, i, core_count, prev_freq = 0, freq;
 	u32 volt;
 	struct cpufreq_frequency_table	*table;

 	table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
 	if (!table)
 		return -ENOMEM;

 	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
 		data = readl_relaxed(base + REG_FREQ_LUT +
 				      i * LUT_ROW_SIZE);
 		src = FIELD_GET(LUT_SRC, data);
 		lval = FIELD_GET(LUT_L_VAL, data);
 		core_count = FIELD_GET(LUT_CORE_COUNT, data);

 		data = readl_relaxed(base + REG_VOLT_LUT +
 				      i * LUT_ROW_SIZE);
 		volt = FIELD_GET(LUT_VOLT, data) * 1000;

 		if (src)
 			freq = xo_rate * lval / 1000;
 		else
 			freq = cpu_hw_rate / 1000;

 		if (freq != prev_freq && core_count != LUT_TURBO_IND) {
 			table[i].frequency = freq;
 			dev_pm_opp_add(cpu_dev, freq * 1000, volt);
 			dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
 				freq, core_count);
 		} else if (core_count == LUT_TURBO_IND) {
 			table[i].frequency = CPUFREQ_ENTRY_INVALID;
 		}

 		/*
 		 * Two of the same frequencies with the same core counts means
 		 * end of table
 		 */
 		if (i > 0 && prev_freq == freq) {
 			struct cpufreq_frequency_table *prev = &table[i - 1];

 			/*
 			 * Only treat the last frequency that might be a boost
 			 * as the boost frequency
 			 */
 			if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
 				prev->frequency = prev_freq;
 				prev->flags = CPUFREQ_BOOST_FREQ;
 				dev_pm_opp_add(cpu_dev,	prev_freq * 1000, volt);
 			}

 			break;
 		}

 		prev_freq = freq;
 	}

 	table[i].frequency = CPUFREQ_TABLE_END;
 	policy->freq_table = table;
 	dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);

 	return 0;
 }

 static void qcom_get_related_cpus(int index, struct cpumask *m)
 {
 	struct device_node *cpu_np;
 	struct of_phandle_args args;
 	int cpu, ret;

 	for_each_possible_cpu(cpu) {
 		cpu_np = of_cpu_device_node_get(cpu);
 		if (!cpu_np)
 			continue;

 		ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
 						 "#freq-domain-cells", 0,
 						 &args);
 		of_node_put(cpu_np);
 		if (ret < 0)
 			continue;

 		if (index == args.args[0])
 			cpumask_set_cpu(cpu, m);
 	}
 }

 static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 {
 	struct device *dev = &global_pdev->dev;
 	struct of_phandle_args args;
 	struct device_node *cpu_np;
 	struct device *cpu_dev;
 	struct resource *res;
 	void __iomem *base;
 	int ret, index;

 	cpu_dev = get_cpu_device(policy->cpu);
 	if (!cpu_dev) {
 		pr_err("%s: failed to get cpu%d device\n", __func__,
 		       policy->cpu);
 		return -ENODEV;
 	}

 	cpu_np = of_cpu_device_node_get(policy->cpu);
 	if (!cpu_np)
 		return -EINVAL;

 	ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
 					 "#freq-domain-cells", 0, &args);
 	of_node_put(cpu_np);
 	if (ret)
 		return ret;

 	index = args.args[0];

 	res = platform_get_resource(global_pdev, IORESOURCE_MEM, index);
 	if (!res)
 		return -ENODEV;

 	base = devm_ioremap(dev, res->start, resource_size(res));
 	if (!base)
 		return -ENOMEM;

 	/* HW should be in enabled state to proceed */
 	if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) {
 		dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
 		ret = -ENODEV;
 		goto error;
 	}

 	qcom_get_related_cpus(index, policy->cpus);
 	if (!cpumask_weight(policy->cpus)) {
 		dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
 		ret = -ENOENT;
 		goto error;
 	}

 	policy->driver_data = base + REG_PERF_STATE;

 	ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
 	if (ret) {
 		dev_err(dev, "Domain-%d failed to read LUT\n", index);
 		goto error;
 	}

 	ret = dev_pm_opp_get_opp_count(cpu_dev);
 	if (ret <= 0) {
 		dev_err(cpu_dev, "Failed to add OPPs\n");
 		ret = -ENODEV;
 		goto error;
 	}

 	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);

 	policy->fast_switch_possible = true;

 	return 0;
 error:
 	devm_iounmap(dev, base);
 	return ret;
 }

 static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
 {
 	struct device *cpu_dev = get_cpu_device(policy->cpu);
 	void __iomem *base = policy->driver_data - REG_PERF_STATE;

 	dev_pm_opp_remove_all_dynamic(cpu_dev);
 	kfree(policy->freq_table);
 	devm_iounmap(&global_pdev->dev, base);

 	return 0;
 }

 static struct freq_attr *qcom_cpufreq_hw_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
 	&cpufreq_freq_attr_scaling_boost_freqs,
 	NULL
 };

 static struct cpufreq_driver cpufreq_qcom_hw_driver = {
 	.flags		= CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK |
 			  CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
 			  CPUFREQ_IS_COOLING_DEV,
 	.verify		= cpufreq_generic_frequency_table_verify,
 	.target_index	= qcom_cpufreq_hw_target_index,
 	.get		= qcom_cpufreq_hw_get,
 	.init		= qcom_cpufreq_hw_cpu_init,
 	.exit		= qcom_cpufreq_hw_cpu_exit,
 	.fast_switch    = qcom_cpufreq_hw_fast_switch,
 	.name		= "qcom-cpufreq-hw",
 	.attr		= qcom_cpufreq_hw_attr,
 };

 static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
 {
 	struct clk *clk;
 	int ret;

 	clk = clk_get(&pdev->dev, "xo");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	xo_rate = clk_get_rate(clk);
 	clk_put(clk);

 	clk = clk_get(&pdev->dev, "alternate");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
 	clk_put(clk);

 	global_pdev = pdev;

 	ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
 	if (ret)
 		dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n");
 	else
 		dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n");

 	return ret;
 }

 static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
 {
 	return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
 }

 static const struct of_device_id qcom_cpufreq_hw_match[] = {
 	{ .compatible = "qcom,cpufreq-hw" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);

 static struct platform_driver qcom_cpufreq_hw_driver = {
 	.probe = qcom_cpufreq_hw_driver_probe,
 	.remove = qcom_cpufreq_hw_driver_remove,
 	.driver = {
 		.name = "qcom-cpufreq-hw",
 		.of_match_table = qcom_cpufreq_hw_match,
 	},
 };

 static int __init qcom_cpufreq_hw_init(void)
 {
 	return platform_driver_register(&qcom_cpufreq_hw_driver);
 }
 postcore_initcall(qcom_cpufreq_hw_init);

 static void __exit qcom_cpufreq_hw_exit(void)
 {
 	platform_driver_unregister(&qcom_cpufreq_hw_driver);
 }
 module_exit(qcom_cpufreq_hw_exit);

 MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2018, The Linux Foundation. All rights reserved.
	*/

	#include <linux/bitfield.h>
	#include <linux/cpufreq.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_address.h>
	#include <linux/of_platform.h>
	#include <linux/pm_opp.h>
	#include <linux/slab.h>

	#define LUT_MAX_ENTRIES 40U
	#define LUT_SRC GENMASK(31, 30)
	#define LUT_L_VAL GENMASK(7, 0)
	#define LUT_CORE_COUNT GENMASK(18, 16)
	#define LUT_VOLT GENMASK(11, 0)
	#define LUT_ROW_SIZE 32
	#define CLK_HW_DIV 2
	#define LUT_TURBO_IND 1

	/* Register offsets */
	#define REG_ENABLE 0x0
	#define REG_FREQ_LUT 0x110
	#define REG_VOLT_LUT 0x114
	#define REG_PERF_STATE 0x920

	static unsigned long cpu_hw_rate, xo_rate;
	static struct platform_device *global_pdev;

	static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
	unsigned int index)
	{
	void __iomem *perf_state_reg = policy->driver_data;
	unsigned long freq = policy->freq_table[index].frequency;

	writel_relaxed(index, perf_state_reg);

	arch_set_freq_scale(policy->related_cpus, freq,
	policy->cpuinfo.max_freq);
	return 0;
	}

	static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
	{
	void __iomem *perf_state_reg;
	struct cpufreq_policy *policy;
	unsigned int index;

	policy = cpufreq_cpu_get_raw(cpu);
	if (!policy)
	return 0;

	perf_state_reg = policy->driver_data;

	index = readl_relaxed(perf_state_reg);
	index = min(index, LUT_MAX_ENTRIES - 1);

	return policy->freq_table[index].frequency;
	}

	static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
	unsigned int target_freq)
	{
	void __iomem *perf_state_reg = policy->driver_data;
	int index;
	unsigned long freq;

	index = policy->cached_resolved_idx;
	if (index < 0)
	return 0;

	writel_relaxed(index, perf_state_reg);

	freq = policy->freq_table[index].frequency;
	arch_set_freq_scale(policy->related_cpus, freq,
	policy->cpuinfo.max_freq);

	return freq;
	}

	static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
	struct cpufreq_policy *policy,
	void __iomem *base)
	{
	u32 data, src, lval, i, core_count, prev_freq = 0, freq;
	u32 volt;
	struct cpufreq_frequency_table *table;

	table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
	if (!table)
	return -ENOMEM;

	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
	data = readl_relaxed(base + REG_FREQ_LUT +
	i * LUT_ROW_SIZE);
	src = FIELD_GET(LUT_SRC, data);
	lval = FIELD_GET(LUT_L_VAL, data);
	core_count = FIELD_GET(LUT_CORE_COUNT, data);

	data = readl_relaxed(base + REG_VOLT_LUT +
	i * LUT_ROW_SIZE);
	volt = FIELD_GET(LUT_VOLT, data) * 1000;

	if (src)
	freq = xo_rate * lval / 1000;
	else
	freq = cpu_hw_rate / 1000;

	if (freq != prev_freq && core_count != LUT_TURBO_IND) {
	table[i].frequency = freq;
	dev_pm_opp_add(cpu_dev, freq * 1000, volt);
	dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
	freq, core_count);
	} else if (core_count == LUT_TURBO_IND) {
	table[i].frequency = CPUFREQ_ENTRY_INVALID;
	}

	/*
	* Two of the same frequencies with the same core counts means
	* end of table
	*/
	if (i > 0 && prev_freq == freq) {
	struct cpufreq_frequency_table *prev = &table[i - 1];

	/*
	* Only treat the last frequency that might be a boost
	* as the boost frequency
	*/
	if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
	prev->frequency = prev_freq;
	prev->flags = CPUFREQ_BOOST_FREQ;
	dev_pm_opp_add(cpu_dev, prev_freq * 1000, volt);
	}

	break;
	}

	prev_freq = freq;
	}

	table[i].frequency = CPUFREQ_TABLE_END;
	policy->freq_table = table;
	dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);

	return 0;
	}

	static void qcom_get_related_cpus(int index, struct cpumask *m)
	{
	struct device_node *cpu_np;
	struct of_phandle_args args;
	int cpu, ret;

	for_each_possible_cpu(cpu) {
	cpu_np = of_cpu_device_node_get(cpu);
	if (!cpu_np)
	continue;

	ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
	"#freq-domain-cells", 0,
	&args);
	of_node_put(cpu_np);
	if (ret < 0)
	continue;

	if (index == args.args[0])
	cpumask_set_cpu(cpu, m);
	}
	}

	static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
	{
	struct device *dev = &global_pdev->dev;
	struct of_phandle_args args;
	struct device_node *cpu_np;
	struct device *cpu_dev;
	struct resource *res;
	void __iomem *base;
	int ret, index;

	cpu_dev = get_cpu_device(policy->cpu);
	if (!cpu_dev) {
	pr_err("%s: failed to get cpu%d device\n", __func__,
	policy->cpu);
	return -ENODEV;
	}

	cpu_np = of_cpu_device_node_get(policy->cpu);
	if (!cpu_np)
	return -EINVAL;

	ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
	"#freq-domain-cells", 0, &args);
	of_node_put(cpu_np);
	if (ret)
	return ret;

	index = args.args[0];

	res = platform_get_resource(global_pdev, IORESOURCE_MEM, index);
	if (!res)
	return -ENODEV;

	base = devm_ioremap(dev, res->start, resource_size(res));
	if (!base)
	return -ENOMEM;

	/* HW should be in enabled state to proceed */
	if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) {
	dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
	ret = -ENODEV;
	goto error;
	}

	qcom_get_related_cpus(index, policy->cpus);
	if (!cpumask_weight(policy->cpus)) {
	dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
	ret = -ENOENT;
	goto error;
	}

	policy->driver_data = base + REG_PERF_STATE;

	ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
	if (ret) {
	dev_err(dev, "Domain-%d failed to read LUT\n", index);
	goto error;
	}

	ret = dev_pm_opp_get_opp_count(cpu_dev);
	if (ret <= 0) {
	dev_err(cpu_dev, "Failed to add OPPs\n");
	ret = -ENODEV;
	goto error;
	}

	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);

	policy->fast_switch_possible = true;

	return 0;
	error:
	devm_iounmap(dev, base);
	return ret;
	}

	static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
	{
	struct device *cpu_dev = get_cpu_device(policy->cpu);
	void __iomem *base = policy->driver_data - REG_PERF_STATE;

	dev_pm_opp_remove_all_dynamic(cpu_dev);
	kfree(policy->freq_table);
	devm_iounmap(&global_pdev->dev, base);

	return 0;
	}

	static struct freq_attr *qcom_cpufreq_hw_attr[] = {
	&cpufreq_freq_attr_scaling_available_freqs,
	&cpufreq_freq_attr_scaling_boost_freqs,
	NULL
	};

	static struct cpufreq_driver cpufreq_qcom_hw_driver = {
	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK \|
	CPUFREQ_HAVE_GOVERNOR_PER_POLICY \|
	CPUFREQ_IS_COOLING_DEV,
	.verify = cpufreq_generic_frequency_table_verify,
	.target_index = qcom_cpufreq_hw_target_index,
	.get = qcom_cpufreq_hw_get,
	.init = qcom_cpufreq_hw_cpu_init,
	.exit = qcom_cpufreq_hw_cpu_exit,
	.fast_switch = qcom_cpufreq_hw_fast_switch,
	.name = "qcom-cpufreq-hw",
	.attr = qcom_cpufreq_hw_attr,
	};

	static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
	{
	struct clk *clk;
	int ret;

	clk = clk_get(&pdev->dev, "xo");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	xo_rate = clk_get_rate(clk);
	clk_put(clk);

	clk = clk_get(&pdev->dev, "alternate");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
	clk_put(clk);

	global_pdev = pdev;

	ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
	if (ret)
	dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n");
	else
	dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n");

	return ret;
	}

	static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
	{
	return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
	}

	static const struct of_device_id qcom_cpufreq_hw_match[] = {
	{ .compatible = "qcom,cpufreq-hw" },
	{}
	};
	MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);

	static struct platform_driver qcom_cpufreq_hw_driver = {
	.probe = qcom_cpufreq_hw_driver_probe,
	.remove = qcom_cpufreq_hw_driver_remove,
	.driver = {
	.name = "qcom-cpufreq-hw",
	.of_match_table = qcom_cpufreq_hw_match,
	},
	};

	static int __init qcom_cpufreq_hw_init(void)
	{
	return platform_driver_register(&qcom_cpufreq_hw_driver);
	}
	postcore_initcall(qcom_cpufreq_hw_init);

	static void __exit qcom_cpufreq_hw_exit(void)
	{
	platform_driver_unregister(&qcom_cpufreq_hw_driver);
	}
	module_exit(qcom_cpufreq_hw_exit);

	MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
	MODULE_LICENSE("GPL v2");