drivers/thermal/qcom/lmh.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only

 /*
  * Copyright (C) 2021, Linaro Limited. All rights reserved.
  */
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/of_platform.h>
 #include <linux/slab.h>
 #include <linux/firmware/qcom/qcom_scm.h>

 #define LMH_NODE_DCVS			0x44435653
 #define LMH_CLUSTER0_NODE_ID		0x6370302D
 #define LMH_CLUSTER1_NODE_ID		0x6370312D

 #define LMH_SUB_FN_THERMAL		0x54484D4C
 #define LMH_SUB_FN_CRNT			0x43524E54
 #define LMH_SUB_FN_REL			0x52454C00
 #define LMH_SUB_FN_BCL			0x42434C00

 #define LMH_ALGO_MODE_ENABLE		0x454E424C
 #define LMH_TH_HI_THRESHOLD		0x48494748
 #define LMH_TH_LOW_THRESHOLD		0x4C4F5700
 #define LMH_TH_ARM_THRESHOLD		0x41524D00

 #define LMH_REG_DCVS_INTR_CLR		0x8

 #define LMH_ENABLE_ALGOS		1

 struct lmh_hw_data {
 	void __iomem *base;
 	struct irq_domain *domain;
 	int irq;
 };

 static irqreturn_t lmh_handle_irq(int hw_irq, void *data)
 {
 	struct lmh_hw_data *lmh_data = data;
 	int irq = irq_find_mapping(lmh_data->domain, 0);

 	/* Call the cpufreq driver to handle the interrupt */
 	if (irq)
 		generic_handle_irq(irq);

 	return IRQ_HANDLED;
 }

 static void lmh_enable_interrupt(struct irq_data *d)
 {
 	struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);

 	/* Clear the existing interrupt */
 	writel(0xff, lmh_data->base + LMH_REG_DCVS_INTR_CLR);
 	enable_irq(lmh_data->irq);
 }

 static void lmh_disable_interrupt(struct irq_data *d)
 {
 	struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);

 	disable_irq_nosync(lmh_data->irq);
 }

 static struct irq_chip lmh_irq_chip = {
 	.name           = "lmh",
 	.irq_enable	= lmh_enable_interrupt,
 	.irq_disable	= lmh_disable_interrupt
 };

 static int lmh_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
 	struct lmh_hw_data *lmh_data = d->host_data;
 	static struct lock_class_key lmh_lock_key;
 	static struct lock_class_key lmh_request_key;

 	/*
 	 * This lock class tells lockdep that GPIO irqs are in a different
 	 * category than their parents, so it won't report false recursion.
 	 */
 	irq_set_lockdep_class(irq, &lmh_lock_key, &lmh_request_key);
 	irq_set_chip_and_handler(irq, &lmh_irq_chip, handle_simple_irq);
 	irq_set_chip_data(irq, lmh_data);

 	return 0;
 }

 static const struct irq_domain_ops lmh_irq_ops = {
 	.map = lmh_irq_map,
 	.xlate = irq_domain_xlate_onecell,
 };

 static int lmh_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct device_node *cpu_node;
 	struct lmh_hw_data *lmh_data;
 	int temp_low, temp_high, temp_arm, cpu_id, ret;
 	unsigned int enable_alg;
 	u32 node_id;

 	if (!qcom_scm_is_available())
 		return -EPROBE_DEFER;

 	lmh_data = devm_kzalloc(dev, sizeof(*lmh_data), GFP_KERNEL);
 	if (!lmh_data)
 		return -ENOMEM;

 	lmh_data->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(lmh_data->base))
 		return PTR_ERR(lmh_data->base);

 	cpu_node = of_parse_phandle(np, "cpus", 0);
 	if (!cpu_node)
 		return -EINVAL;
 	cpu_id = of_cpu_node_to_id(cpu_node);
 	of_node_put(cpu_node);

 	ret = of_property_read_u32(np, "qcom,lmh-temp-high-millicelsius", &temp_high);
 	if (ret) {
 		dev_err(dev, "missing qcom,lmh-temp-high-millicelsius property\n");
 		return ret;
 	}

 	ret = of_property_read_u32(np, "qcom,lmh-temp-low-millicelsius", &temp_low);
 	if (ret) {
 		dev_err(dev, "missing qcom,lmh-temp-low-millicelsius property\n");
 		return ret;
 	}

 	ret = of_property_read_u32(np, "qcom,lmh-temp-arm-millicelsius", &temp_arm);
 	if (ret) {
 		dev_err(dev, "missing qcom,lmh-temp-arm-millicelsius property\n");
 		return ret;
 	}

 	/*
 	 * Only sdm845 has lmh hardware currently enabled from hlos. If this is needed
 	 * for other platforms, revisit this to check if the <cpu-id, node-id> should be part
 	 * of a dt match table.
 	 */
 	if (cpu_id == 0) {
 		node_id = LMH_CLUSTER0_NODE_ID;
 	} else if (cpu_id == 4) {
 		node_id = LMH_CLUSTER1_NODE_ID;
 	} else {
 		dev_err(dev, "Wrong CPU id associated with LMh node\n");
 		return -EINVAL;
 	}

 	if (!qcom_scm_lmh_dcvsh_available())
 		return -EINVAL;

 	enable_alg = (uintptr_t)of_device_get_match_data(dev);

 	if (enable_alg) {
 		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
 					 LMH_NODE_DCVS, node_id, 0);
 		if (ret)
 			dev_err(dev, "Error %d enabling current subfunction\n", ret);

 		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
 					 LMH_NODE_DCVS, node_id, 0);
 		if (ret)
 			dev_err(dev, "Error %d enabling reliability subfunction\n", ret);

 		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
 					 LMH_NODE_DCVS, node_id, 0);
 		if (ret)
 			dev_err(dev, "Error %d enabling BCL subfunction\n", ret);

 		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
 					 LMH_NODE_DCVS, node_id, 0);
 		if (ret) {
 			dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
 			return ret;
 		}

 		ret = qcom_scm_lmh_profile_change(0x1);
 		if (ret) {
 			dev_err(dev, "Error %d changing profile\n", ret);
 			return ret;
 		}
 	}

 	/* Set default thermal trips */
 	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_ARM_THRESHOLD, temp_arm,
 				 LMH_NODE_DCVS, node_id, 0);
 	if (ret) {
 		dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
 		return ret;
 	}

 	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_HI_THRESHOLD, temp_high,
 				 LMH_NODE_DCVS, node_id, 0);
 	if (ret) {
 		dev_err(dev, "Error setting thermal HI threshold%d\n", ret);
 		return ret;
 	}

 	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_LOW_THRESHOLD, temp_low,
 				 LMH_NODE_DCVS, node_id, 0);
 	if (ret) {
 		dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
 		return ret;
 	}

 	lmh_data->irq = platform_get_irq(pdev, 0);
 	lmh_data->domain = irq_domain_add_linear(np, 1, &lmh_irq_ops, lmh_data);
 	if (!lmh_data->domain) {
 		dev_err(dev, "Error adding irq_domain\n");
 		return -EINVAL;
 	}

 	/* Disable the irq and let cpufreq enable it when ready to handle the interrupt */
 	irq_set_status_flags(lmh_data->irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(dev, lmh_data->irq, lmh_handle_irq,
 			       IRQF_ONESHOT | IRQF_NO_SUSPEND,
 			       "lmh-irq", lmh_data);
 	if (ret) {
 		dev_err(dev, "Error %d registering irq %x\n", ret, lmh_data->irq);
 		irq_domain_remove(lmh_data->domain);
 		return ret;
 	}

 	return 0;
 }

 static const struct of_device_id lmh_table[] = {
 	{ .compatible = "qcom,sc8180x-lmh", },
 	{ .compatible = "qcom,sdm845-lmh", .data = (void *)LMH_ENABLE_ALGOS},
 	{ .compatible = "qcom,sm8150-lmh", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, lmh_table);

 static struct platform_driver lmh_driver = {
 	.probe = lmh_probe,
 	.driver = {
 		.name = "qcom-lmh",
 		.of_match_table = lmh_table,
 		.suppress_bind_attrs = true,
 	},
 };
 module_platform_driver(lmh_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("QCOM LMh driver");
	// SPDX-License-Identifier: GPL-2.0-only

	/*
	* Copyright (C) 2021, Linaro Limited. All rights reserved.
	*/
	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/irqdomain.h>
	#include <linux/err.h>
	#include <linux/platform_device.h>
	#include <linux/of_platform.h>
	#include <linux/slab.h>
	#include <linux/firmware/qcom/qcom_scm.h>

	#define LMH_NODE_DCVS 0x44435653
	#define LMH_CLUSTER0_NODE_ID 0x6370302D
	#define LMH_CLUSTER1_NODE_ID 0x6370312D

	#define LMH_SUB_FN_THERMAL 0x54484D4C
	#define LMH_SUB_FN_CRNT 0x43524E54
	#define LMH_SUB_FN_REL 0x52454C00
	#define LMH_SUB_FN_BCL 0x42434C00

	#define LMH_ALGO_MODE_ENABLE 0x454E424C
	#define LMH_TH_HI_THRESHOLD 0x48494748
	#define LMH_TH_LOW_THRESHOLD 0x4C4F5700
	#define LMH_TH_ARM_THRESHOLD 0x41524D00

	#define LMH_REG_DCVS_INTR_CLR 0x8

	#define LMH_ENABLE_ALGOS 1

	struct lmh_hw_data {
	void __iomem *base;
	struct irq_domain *domain;
	int irq;
	};

	static irqreturn_t lmh_handle_irq(int hw_irq, void *data)
	{
	struct lmh_hw_data *lmh_data = data;
	int irq = irq_find_mapping(lmh_data->domain, 0);

	/* Call the cpufreq driver to handle the interrupt */
	if (irq)
	generic_handle_irq(irq);

	return IRQ_HANDLED;
	}

	static void lmh_enable_interrupt(struct irq_data *d)
	{
	struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);

	/* Clear the existing interrupt */
	writel(0xff, lmh_data->base + LMH_REG_DCVS_INTR_CLR);
	enable_irq(lmh_data->irq);
	}

	static void lmh_disable_interrupt(struct irq_data *d)
	{
	struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);

	disable_irq_nosync(lmh_data->irq);
	}

	static struct irq_chip lmh_irq_chip = {
	.name = "lmh",
	.irq_enable = lmh_enable_interrupt,
	.irq_disable = lmh_disable_interrupt
	};

	static int lmh_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
	{
	struct lmh_hw_data *lmh_data = d->host_data;
	static struct lock_class_key lmh_lock_key;
	static struct lock_class_key lmh_request_key;

	/*
	* This lock class tells lockdep that GPIO irqs are in a different
	* category than their parents, so it won't report false recursion.
	*/
	irq_set_lockdep_class(irq, &lmh_lock_key, &lmh_request_key);
	irq_set_chip_and_handler(irq, &lmh_irq_chip, handle_simple_irq);
	irq_set_chip_data(irq, lmh_data);

	return 0;
	}

	static const struct irq_domain_ops lmh_irq_ops = {
	.map = lmh_irq_map,
	.xlate = irq_domain_xlate_onecell,
	};

	static int lmh_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct device_node *cpu_node;
	struct lmh_hw_data *lmh_data;
	int temp_low, temp_high, temp_arm, cpu_id, ret;
	unsigned int enable_alg;
	u32 node_id;

	if (!qcom_scm_is_available())
	return -EPROBE_DEFER;

	lmh_data = devm_kzalloc(dev, sizeof(*lmh_data), GFP_KERNEL);
	if (!lmh_data)
	return -ENOMEM;

	lmh_data->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(lmh_data->base))
	return PTR_ERR(lmh_data->base);

	cpu_node = of_parse_phandle(np, "cpus", 0);
	if (!cpu_node)
	return -EINVAL;
	cpu_id = of_cpu_node_to_id(cpu_node);
	of_node_put(cpu_node);

	ret = of_property_read_u32(np, "qcom,lmh-temp-high-millicelsius", &temp_high);
	if (ret) {
	dev_err(dev, "missing qcom,lmh-temp-high-millicelsius property\n");
	return ret;
	}

	ret = of_property_read_u32(np, "qcom,lmh-temp-low-millicelsius", &temp_low);
	if (ret) {
	dev_err(dev, "missing qcom,lmh-temp-low-millicelsius property\n");
	return ret;
	}

	ret = of_property_read_u32(np, "qcom,lmh-temp-arm-millicelsius", &temp_arm);
	if (ret) {
	dev_err(dev, "missing qcom,lmh-temp-arm-millicelsius property\n");
	return ret;
	}

	/*
	* Only sdm845 has lmh hardware currently enabled from hlos. If this is needed
	* for other platforms, revisit this to check if the <cpu-id, node-id> should be part
	* of a dt match table.
	*/
	if (cpu_id == 0) {
	node_id = LMH_CLUSTER0_NODE_ID;
	} else if (cpu_id == 4) {
	node_id = LMH_CLUSTER1_NODE_ID;
	} else {
	dev_err(dev, "Wrong CPU id associated with LMh node\n");
	return -EINVAL;
	}

	if (!qcom_scm_lmh_dcvsh_available())
	return -EINVAL;

	enable_alg = (uintptr_t)of_device_get_match_data(dev);

	if (enable_alg) {
	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
	LMH_NODE_DCVS, node_id, 0);
	if (ret)
	dev_err(dev, "Error %d enabling current subfunction\n", ret);

	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
	LMH_NODE_DCVS, node_id, 0);
	if (ret)
	dev_err(dev, "Error %d enabling reliability subfunction\n", ret);

	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
	LMH_NODE_DCVS, node_id, 0);
	if (ret)
	dev_err(dev, "Error %d enabling BCL subfunction\n", ret);

	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
	LMH_NODE_DCVS, node_id, 0);
	if (ret) {
	dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
	return ret;
	}

	ret = qcom_scm_lmh_profile_change(0x1);
	if (ret) {
	dev_err(dev, "Error %d changing profile\n", ret);
	return ret;
	}
	}

	/* Set default thermal trips */
	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_ARM_THRESHOLD, temp_arm,
	LMH_NODE_DCVS, node_id, 0);
	if (ret) {
	dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
	return ret;
	}

	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_HI_THRESHOLD, temp_high,
	LMH_NODE_DCVS, node_id, 0);
	if (ret) {
	dev_err(dev, "Error setting thermal HI threshold%d\n", ret);
	return ret;
	}

	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_LOW_THRESHOLD, temp_low,
	LMH_NODE_DCVS, node_id, 0);
	if (ret) {
	dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
	return ret;
	}

	lmh_data->irq = platform_get_irq(pdev, 0);
	lmh_data->domain = irq_domain_add_linear(np, 1, &lmh_irq_ops, lmh_data);
	if (!lmh_data->domain) {
	dev_err(dev, "Error adding irq_domain\n");
	return -EINVAL;
	}

	/* Disable the irq and let cpufreq enable it when ready to handle the interrupt */
	irq_set_status_flags(lmh_data->irq, IRQ_NOAUTOEN);
	ret = devm_request_irq(dev, lmh_data->irq, lmh_handle_irq,
	IRQF_ONESHOT \| IRQF_NO_SUSPEND,
	"lmh-irq", lmh_data);
	if (ret) {
	dev_err(dev, "Error %d registering irq %x\n", ret, lmh_data->irq);
	irq_domain_remove(lmh_data->domain);
	return ret;
	}

	return 0;
	}

	static const struct of_device_id lmh_table[] = {
	{ .compatible = "qcom,sc8180x-lmh", },
	{ .compatible = "qcom,sdm845-lmh", .data = (void *)LMH_ENABLE_ALGOS},
	{ .compatible = "qcom,sm8150-lmh", },
	{}
	};
	MODULE_DEVICE_TABLE(of, lmh_table);

	static struct platform_driver lmh_driver = {
	.probe = lmh_probe,
	.driver = {
	.name = "qcom-lmh",
	.of_match_table = lmh_table,
	.suppress_bind_attrs = true,
	},
	};
	module_platform_driver(lmh_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("QCOM LMh driver");