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

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

 /*
  * In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
  * the CPU frequency subset and voltage value of each OPP varies
  * based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables
  * defines the voltage and frequency value based on the msm-id in SMEM
  * and speedbin blown in the efuse combination.
  * The qcom-cpufreq-nvmem driver reads the msm-id and efuse value from the SoC
  * to provide the OPP framework with required information.
  * This is used to determine the voltage and frequency value for each OPP of
  * operating-points-v2 table when it is parsed by the OPP framework.
  */

 #include <linux/cpu.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_opp.h>
 #include <linux/slab.h>
 #include <linux/soc/qcom/smem.h>

 #define MSM_ID_SMEM	137

 enum _msm_id {
 	MSM8996V3 = 0xF6ul,
 	APQ8096V3 = 0x123ul,
 	MSM8996SG = 0x131ul,
 	APQ8096SG = 0x138ul,
 };

 enum _msm8996_version {
 	MSM8996_V3,
 	MSM8996_SG,
 	NUM_OF_MSM8996_VERSIONS,
 };

 struct qcom_cpufreq_drv;

 struct qcom_cpufreq_match_data {
 	int (*get_version)(struct device *cpu_dev,
 			   struct nvmem_cell *speedbin_nvmem,
 			   char **pvs_name,
 			   struct qcom_cpufreq_drv *drv);
 	const char **genpd_names;
 };

 struct qcom_cpufreq_drv {
 	struct opp_table **names_opp_tables;
 	struct opp_table **hw_opp_tables;
 	struct opp_table **genpd_opp_tables;
 	u32 versions;
 	const struct qcom_cpufreq_match_data *data;
 };

 static struct platform_device *cpufreq_dt_pdev, *cpufreq_pdev;

 static void get_krait_bin_format_a(struct device *cpu_dev,
 					  int *speed, int *pvs, int *pvs_ver,
 					  struct nvmem_cell *pvs_nvmem, u8 *buf)
 {
 	u32 pte_efuse;

 	pte_efuse = *((u32 *)buf);

 	*speed = pte_efuse & 0xf;
 	if (*speed == 0xf)
 		*speed = (pte_efuse >> 4) & 0xf;

 	if (*speed == 0xf) {
 		*speed = 0;
 		dev_warn(cpu_dev, "Speed bin: Defaulting to %d\n", *speed);
 	} else {
 		dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
 	}

 	*pvs = (pte_efuse >> 10) & 0x7;
 	if (*pvs == 0x7)
 		*pvs = (pte_efuse >> 13) & 0x7;

 	if (*pvs == 0x7) {
 		*pvs = 0;
 		dev_warn(cpu_dev, "PVS bin: Defaulting to %d\n", *pvs);
 	} else {
 		dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
 	}
 }

 static void get_krait_bin_format_b(struct device *cpu_dev,
 					  int *speed, int *pvs, int *pvs_ver,
 					  struct nvmem_cell *pvs_nvmem, u8 *buf)
 {
 	u32 pte_efuse, redundant_sel;

 	pte_efuse = *((u32 *)buf);
 	redundant_sel = (pte_efuse >> 24) & 0x7;

 	*pvs_ver = (pte_efuse >> 4) & 0x3;

 	switch (redundant_sel) {
 	case 1:
 		*pvs = ((pte_efuse >> 28) & 0x8) | ((pte_efuse >> 6) & 0x7);
 		*speed = (pte_efuse >> 27) & 0xf;
 		break;
 	case 2:
 		*pvs = (pte_efuse >> 27) & 0xf;
 		*speed = pte_efuse & 0x7;
 		break;
 	default:
 		/* 4 bits of PVS are in efuse register bits 31, 8-6. */
 		*pvs = ((pte_efuse >> 28) & 0x8) | ((pte_efuse >> 6) & 0x7);
 		*speed = pte_efuse & 0x7;
 	}

 	/* Check SPEED_BIN_BLOW_STATUS */
 	if (pte_efuse & BIT(3)) {
 		dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
 	} else {
 		dev_warn(cpu_dev, "Speed bin not set. Defaulting to 0!\n");
 		*speed = 0;
 	}

 	/* Check PVS_BLOW_STATUS */
 	pte_efuse = *(((u32 *)buf) + 4);
 	pte_efuse &= BIT(21);
 	if (pte_efuse) {
 		dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
 	} else {
 		dev_warn(cpu_dev, "PVS bin not set. Defaulting to 0!\n");
 		*pvs = 0;
 	}

 	dev_dbg(cpu_dev, "PVS version: %d\n", *pvs_ver);
 }

 static enum _msm8996_version qcom_cpufreq_get_msm_id(void)
 {
 	size_t len;
 	u32 *msm_id;
 	enum _msm8996_version version;

 	msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
 	if (IS_ERR(msm_id))
 		return NUM_OF_MSM8996_VERSIONS;

 	/* The first 4 bytes are format, next to them is the actual msm-id */
 	msm_id++;

 	switch ((enum _msm_id)*msm_id) {
 	case MSM8996V3:
 	case APQ8096V3:
 		version = MSM8996_V3;
 		break;
 	case MSM8996SG:
 	case APQ8096SG:
 		version = MSM8996_SG;
 		break;
 	default:
 		version = NUM_OF_MSM8996_VERSIONS;
 	}

 	return version;
 }

 static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
 					  struct nvmem_cell *speedbin_nvmem,
 					  char **pvs_name,
 					  struct qcom_cpufreq_drv *drv)
 {
 	size_t len;
 	u8 *speedbin;
 	enum _msm8996_version msm8996_version;
 	*pvs_name = NULL;

 	msm8996_version = qcom_cpufreq_get_msm_id();
 	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
 		dev_err(cpu_dev, "Not Snapdragon 820/821!");
 		return -ENODEV;
 	}

 	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
 	if (IS_ERR(speedbin))
 		return PTR_ERR(speedbin);

 	switch (msm8996_version) {
 	case MSM8996_V3:
 		drv->versions = 1 << (unsigned int)(*speedbin);
 		break;
 	case MSM8996_SG:
 		drv->versions = 1 << ((unsigned int)(*speedbin) + 4);
 		break;
 	default:
 		BUG();
 		break;
 	}

 	kfree(speedbin);
 	return 0;
 }

 static int qcom_cpufreq_krait_name_version(struct device *cpu_dev,
 					   struct nvmem_cell *speedbin_nvmem,
 					   char **pvs_name,
 					   struct qcom_cpufreq_drv *drv)
 {
 	int speed = 0, pvs = 0, pvs_ver = 0;
 	u8 *speedbin;
 	size_t len;

 	speedbin = nvmem_cell_read(speedbin_nvmem, &len);

 	if (IS_ERR(speedbin))
 		return PTR_ERR(speedbin);

 	switch (len) {
 	case 4:
 		get_krait_bin_format_a(cpu_dev, &speed, &pvs, &pvs_ver,
 				       speedbin_nvmem, speedbin);
 		break;
 	case 8:
 		get_krait_bin_format_b(cpu_dev, &speed, &pvs, &pvs_ver,
 				       speedbin_nvmem, speedbin);
 		break;
 	default:
 		dev_err(cpu_dev, "Unable to read nvmem data. Defaulting to 0!\n");
 		return -ENODEV;
 	}

 	snprintf(*pvs_name, sizeof("speedXX-pvsXX-vXX"), "speed%d-pvs%d-v%d",
 		 speed, pvs, pvs_ver);

 	drv->versions = (1 << speed);

 	kfree(speedbin);
 	return 0;
 }

 static const struct qcom_cpufreq_match_data match_data_kryo = {
 	.get_version = qcom_cpufreq_kryo_name_version,
 };

 static const struct qcom_cpufreq_match_data match_data_krait = {
 	.get_version = qcom_cpufreq_krait_name_version,
 };

 static const char *qcs404_genpd_names[] = { "cpr", NULL };

 static const struct qcom_cpufreq_match_data match_data_qcs404 = {
 	.genpd_names = qcs404_genpd_names,
 };

 static int qcom_cpufreq_probe(struct platform_device *pdev)
 {
 	struct qcom_cpufreq_drv *drv;
 	struct nvmem_cell *speedbin_nvmem;
 	struct device_node *np;
 	struct device *cpu_dev;
 	char *pvs_name = "speedXX-pvsXX-vXX";
 	unsigned cpu;
 	const struct of_device_id *match;
 	int ret;

 	cpu_dev = get_cpu_device(0);
 	if (!cpu_dev)
 		return -ENODEV;

 	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
 	if (!np)
 		return -ENOENT;

 	ret = of_device_is_compatible(np, "operating-points-v2-qcom-cpu");
 	if (!ret) {
 		of_node_put(np);
 		return -ENOENT;
 	}

 	drv = kzalloc(sizeof(*drv), GFP_KERNEL);
 	if (!drv)
 		return -ENOMEM;

 	match = pdev->dev.platform_data;
 	drv->data = match->data;
 	if (!drv->data) {
 		ret = -ENODEV;
 		goto free_drv;
 	}

 	if (drv->data->get_version) {
 		speedbin_nvmem = of_nvmem_cell_get(np, NULL);
 		if (IS_ERR(speedbin_nvmem)) {
 			if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
 				dev_err(cpu_dev,
 					"Could not get nvmem cell: %ld\n",
 					PTR_ERR(speedbin_nvmem));
 			ret = PTR_ERR(speedbin_nvmem);
 			goto free_drv;
 		}

 		ret = drv->data->get_version(cpu_dev,
 							speedbin_nvmem, &pvs_name, drv);
 		if (ret) {
 			nvmem_cell_put(speedbin_nvmem);
 			goto free_drv;
 		}
 		nvmem_cell_put(speedbin_nvmem);
 	}
 	of_node_put(np);

 	drv->names_opp_tables = kcalloc(num_possible_cpus(),
 				  sizeof(*drv->names_opp_tables),
 				  GFP_KERNEL);
 	if (!drv->names_opp_tables) {
 		ret = -ENOMEM;
 		goto free_drv;
 	}
 	drv->hw_opp_tables = kcalloc(num_possible_cpus(),
 				  sizeof(*drv->hw_opp_tables),
 				  GFP_KERNEL);
 	if (!drv->hw_opp_tables) {
 		ret = -ENOMEM;
 		goto free_opp_names;
 	}

 	drv->genpd_opp_tables = kcalloc(num_possible_cpus(),
 					sizeof(*drv->genpd_opp_tables),
 					GFP_KERNEL);
 	if (!drv->genpd_opp_tables) {
 		ret = -ENOMEM;
 		goto free_opp;
 	}

 	for_each_possible_cpu(cpu) {
 		cpu_dev = get_cpu_device(cpu);
 		if (NULL == cpu_dev) {
 			ret = -ENODEV;
 			goto free_genpd_opp;
 		}

 		if (drv->data->get_version) {

 			if (pvs_name) {
 				drv->names_opp_tables[cpu] = dev_pm_opp_set_prop_name(
 								     cpu_dev,
 								     pvs_name);
 				if (IS_ERR(drv->names_opp_tables[cpu])) {
 					ret = PTR_ERR(drv->names_opp_tables[cpu]);
 					dev_err(cpu_dev, "Failed to add OPP name %s\n",
 						pvs_name);
 					goto free_opp;
 				}
 			}

 			drv->hw_opp_tables[cpu] = dev_pm_opp_set_supported_hw(
 									 cpu_dev, &drv->versions, 1);
 			if (IS_ERR(drv->hw_opp_tables[cpu])) {
 				ret = PTR_ERR(drv->hw_opp_tables[cpu]);
 				dev_err(cpu_dev,
 					"Failed to set supported hardware\n");
 				goto free_genpd_opp;
 			}
 		}

 		if (drv->data->genpd_names) {
 			drv->genpd_opp_tables[cpu] =
 				dev_pm_opp_attach_genpd(cpu_dev,
 							drv->data->genpd_names,
 							NULL);
 			if (IS_ERR(drv->genpd_opp_tables[cpu])) {
 				ret = PTR_ERR(drv->genpd_opp_tables[cpu]);
 				if (ret != -EPROBE_DEFER)
 					dev_err(cpu_dev,
 						"Could not attach to pm_domain: %d\n",
 						ret);
 				goto free_genpd_opp;
 			}
 		}
 	}

 	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
 							  NULL, 0);
 	if (!IS_ERR(cpufreq_dt_pdev)) {
 		platform_set_drvdata(pdev, drv);
 		return 0;
 	}

 	ret = PTR_ERR(cpufreq_dt_pdev);
 	dev_err(cpu_dev, "Failed to register platform device\n");

 free_genpd_opp:
 	for_each_possible_cpu(cpu) {
 		if (IS_ERR_OR_NULL(drv->genpd_opp_tables[cpu]))
 			break;
 		dev_pm_opp_detach_genpd(drv->genpd_opp_tables[cpu]);
 	}
 	kfree(drv->genpd_opp_tables);
 free_opp:
 	for_each_possible_cpu(cpu) {
 		if (IS_ERR_OR_NULL(drv->names_opp_tables[cpu]))
 			break;
 		dev_pm_opp_put_prop_name(drv->names_opp_tables[cpu]);
 	}
 	for_each_possible_cpu(cpu) {
 		if (IS_ERR_OR_NULL(drv->hw_opp_tables[cpu]))
 			break;
 		dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
 	}
 	kfree(drv->hw_opp_tables);
 free_opp_names:
 	kfree(drv->names_opp_tables);
 free_drv:
 	kfree(drv);

 	return ret;
 }

 static int qcom_cpufreq_remove(struct platform_device *pdev)
 {
 	struct qcom_cpufreq_drv *drv = platform_get_drvdata(pdev);
 	unsigned int cpu;

 	platform_device_unregister(cpufreq_dt_pdev);

 	for_each_possible_cpu(cpu) {
 		if (drv->names_opp_tables[cpu])
 			dev_pm_opp_put_supported_hw(drv->names_opp_tables[cpu]);
 		if (drv->hw_opp_tables[cpu])
 			dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
 		if (drv->genpd_opp_tables[cpu])
 			dev_pm_opp_detach_genpd(drv->genpd_opp_tables[cpu]);
 	}

 	kfree(drv->names_opp_tables);
 	kfree(drv->hw_opp_tables);
 	kfree(drv->genpd_opp_tables);
 	kfree(drv);

 	return 0;
 }

 static struct platform_driver qcom_cpufreq_driver = {
 	.probe = qcom_cpufreq_probe,
 	.remove = qcom_cpufreq_remove,
 	.driver = {
 		.name = "qcom-cpufreq-nvmem",
 	},
 };

 static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
 	{ .compatible = "qcom,apq8096", .data = &match_data_kryo },
 	{ .compatible = "qcom,msm8996", .data = &match_data_kryo },
 	{ .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
 	{ .compatible = "qcom,ipq8064", .data = &match_data_krait },
 	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
 	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
 	{ .compatible = "qcom,msm8960", .data = &match_data_krait },
 	{},
 };

 /*
  * Since the driver depends on smem and nvmem drivers, which may
  * return EPROBE_DEFER, all the real activity is done in the probe,
  * which may be defered as well. The init here is only registering
  * the driver and the platform device.
  */
 static int __init qcom_cpufreq_init(void)
 {
 	struct device_node *np = of_find_node_by_path("/");
 	const struct of_device_id *match;
 	int ret;

 	if (!np)
 		return -ENODEV;

 	match = of_match_node(qcom_cpufreq_match_list, np);
 	of_node_put(np);
 	if (!match)
 		return -ENODEV;

 	ret = platform_driver_register(&qcom_cpufreq_driver);
 	if (unlikely(ret < 0))
 		return ret;

 	cpufreq_pdev = platform_device_register_data(NULL, "qcom-cpufreq-nvmem",
 						     -1, match, sizeof(*match));
 	ret = PTR_ERR_OR_ZERO(cpufreq_pdev);
 	if (0 == ret)
 		return 0;

 	platform_driver_unregister(&qcom_cpufreq_driver);
 	return ret;
 }
 module_init(qcom_cpufreq_init);

 static void __exit qcom_cpufreq_exit(void)
 {
 	platform_device_unregister(cpufreq_pdev);
 	platform_driver_unregister(&qcom_cpufreq_driver);
 }
 module_exit(qcom_cpufreq_exit);

 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. CPUfreq driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2018, The Linux Foundation. All rights reserved.
	*/

	/*
	* In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
	* the CPU frequency subset and voltage value of each OPP varies
	* based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables
	* defines the voltage and frequency value based on the msm-id in SMEM
	* and speedbin blown in the efuse combination.
	* The qcom-cpufreq-nvmem driver reads the msm-id and efuse value from the SoC
	* to provide the OPP framework with required information.
	* This is used to determine the voltage and frequency value for each OPP of
	* operating-points-v2 table when it is parsed by the OPP framework.
	*/

	#include <linux/cpu.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/nvmem-consumer.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/pm_opp.h>
	#include <linux/slab.h>
	#include <linux/soc/qcom/smem.h>

	#define MSM_ID_SMEM 137

	enum _msm_id {
	MSM8996V3 = 0xF6ul,
	APQ8096V3 = 0x123ul,
	MSM8996SG = 0x131ul,
	APQ8096SG = 0x138ul,
	};

	enum _msm8996_version {
	MSM8996_V3,
	MSM8996_SG,
	NUM_OF_MSM8996_VERSIONS,
	};

	struct qcom_cpufreq_drv;

	struct qcom_cpufreq_match_data {
	int (get_version)(struct device cpu_dev,
	struct nvmem_cell *speedbin_nvmem,
	char **pvs_name,
	struct qcom_cpufreq_drv *drv);
	const char **genpd_names;
	};

	struct qcom_cpufreq_drv {
	struct opp_table **names_opp_tables;
	struct opp_table **hw_opp_tables;
	struct opp_table **genpd_opp_tables;
	u32 versions;
	const struct qcom_cpufreq_match_data *data;
	};

	static struct platform_device cpufreq_dt_pdev, cpufreq_pdev;

	static void get_krait_bin_format_a(struct device *cpu_dev,
	int speed, int pvs, int *pvs_ver,
	struct nvmem_cell pvs_nvmem, u8 buf)
	{
	u32 pte_efuse;

	pte_efuse = ((u32 )buf);

	*speed = pte_efuse & 0xf;
	if (*speed == 0xf)
	*speed = (pte_efuse >> 4) & 0xf;

	if (*speed == 0xf) {
	*speed = 0;
	dev_warn(cpu_dev, "Speed bin: Defaulting to %d\n", *speed);
	} else {
	dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
	}

	*pvs = (pte_efuse >> 10) & 0x7;
	if (*pvs == 0x7)
	*pvs = (pte_efuse >> 13) & 0x7;

	if (*pvs == 0x7) {
	*pvs = 0;
	dev_warn(cpu_dev, "PVS bin: Defaulting to %d\n", *pvs);
	} else {
	dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
	}
	}

	static void get_krait_bin_format_b(struct device *cpu_dev,
	int speed, int pvs, int *pvs_ver,
	struct nvmem_cell pvs_nvmem, u8 buf)
	{
	u32 pte_efuse, redundant_sel;

	pte_efuse = ((u32 )buf);
	redundant_sel = (pte_efuse >> 24) & 0x7;

	*pvs_ver = (pte_efuse >> 4) & 0x3;

	switch (redundant_sel) {
	case 1:
	*pvs = ((pte_efuse >> 28) & 0x8) \| ((pte_efuse >> 6) & 0x7);
	*speed = (pte_efuse >> 27) & 0xf;
	break;
	case 2:
	*pvs = (pte_efuse >> 27) & 0xf;
	*speed = pte_efuse & 0x7;
	break;
	default:
	/* 4 bits of PVS are in efuse register bits 31, 8-6. */
	*pvs = ((pte_efuse >> 28) & 0x8) \| ((pte_efuse >> 6) & 0x7);
	*speed = pte_efuse & 0x7;
	}

	/* Check SPEED_BIN_BLOW_STATUS */
	if (pte_efuse & BIT(3)) {
	dev_dbg(cpu_dev, "Speed bin: %d\n", *speed);
	} else {
	dev_warn(cpu_dev, "Speed bin not set. Defaulting to 0!\n");
	*speed = 0;
	}

	/* Check PVS_BLOW_STATUS */
	pte_efuse = (((u32 )buf) + 4);
	pte_efuse &= BIT(21);
	if (pte_efuse) {
	dev_dbg(cpu_dev, "PVS bin: %d\n", *pvs);
	} else {
	dev_warn(cpu_dev, "PVS bin not set. Defaulting to 0!\n");
	*pvs = 0;
	}

	dev_dbg(cpu_dev, "PVS version: %d\n", *pvs_ver);
	}

	static enum _msm8996_version qcom_cpufreq_get_msm_id(void)
	{
	size_t len;
	u32 *msm_id;
	enum _msm8996_version version;

	msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
	if (IS_ERR(msm_id))
	return NUM_OF_MSM8996_VERSIONS;

	/* The first 4 bytes are format, next to them is the actual msm-id */
	msm_id++;

	switch ((enum _msm_id)*msm_id) {
	case MSM8996V3:
	case APQ8096V3:
	version = MSM8996_V3;
	break;
	case MSM8996SG:
	case APQ8096SG:
	version = MSM8996_SG;
	break;
	default:
	version = NUM_OF_MSM8996_VERSIONS;
	}

	return version;
	}

	static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
	struct nvmem_cell *speedbin_nvmem,
	char **pvs_name,
	struct qcom_cpufreq_drv *drv)
	{
	size_t len;
	u8 *speedbin;
	enum _msm8996_version msm8996_version;
	*pvs_name = NULL;

	msm8996_version = qcom_cpufreq_get_msm_id();
	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
	dev_err(cpu_dev, "Not Snapdragon 820/821!");
	return -ENODEV;
	}

	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
	if (IS_ERR(speedbin))
	return PTR_ERR(speedbin);

	switch (msm8996_version) {
	case MSM8996_V3:
	drv->versions = 1 << (unsigned int)(*speedbin);
	break;
	case MSM8996_SG:
	drv->versions = 1 << ((unsigned int)(*speedbin) + 4);
	break;
	default:
	BUG();
	break;
	}

	kfree(speedbin);
	return 0;
	}

	static int qcom_cpufreq_krait_name_version(struct device *cpu_dev,
	struct nvmem_cell *speedbin_nvmem,
	char **pvs_name,
	struct qcom_cpufreq_drv *drv)
	{
	int speed = 0, pvs = 0, pvs_ver = 0;
	u8 *speedbin;
	size_t len;

	speedbin = nvmem_cell_read(speedbin_nvmem, &len);

	if (IS_ERR(speedbin))
	return PTR_ERR(speedbin);

	switch (len) {
	case 4:
	get_krait_bin_format_a(cpu_dev, &speed, &pvs, &pvs_ver,
	speedbin_nvmem, speedbin);
	break;
	case 8:
	get_krait_bin_format_b(cpu_dev, &speed, &pvs, &pvs_ver,
	speedbin_nvmem, speedbin);
	break;
	default:
	dev_err(cpu_dev, "Unable to read nvmem data. Defaulting to 0!\n");
	return -ENODEV;
	}

	snprintf(*pvs_name, sizeof("speedXX-pvsXX-vXX"), "speed%d-pvs%d-v%d",
	speed, pvs, pvs_ver);

	drv->versions = (1 << speed);

	kfree(speedbin);
	return 0;
	}

	static const struct qcom_cpufreq_match_data match_data_kryo = {
	.get_version = qcom_cpufreq_kryo_name_version,
	};

	static const struct qcom_cpufreq_match_data match_data_krait = {
	.get_version = qcom_cpufreq_krait_name_version,
	};

	static const char *qcs404_genpd_names[] = { "cpr", NULL };

	static const struct qcom_cpufreq_match_data match_data_qcs404 = {
	.genpd_names = qcs404_genpd_names,
	};

	static int qcom_cpufreq_probe(struct platform_device *pdev)
	{
	struct qcom_cpufreq_drv *drv;
	struct nvmem_cell *speedbin_nvmem;
	struct device_node *np;
	struct device *cpu_dev;
	char *pvs_name = "speedXX-pvsXX-vXX";
	unsigned cpu;
	const struct of_device_id *match;
	int ret;

	cpu_dev = get_cpu_device(0);
	if (!cpu_dev)
	return -ENODEV;

	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
	if (!np)
	return -ENOENT;

	ret = of_device_is_compatible(np, "operating-points-v2-qcom-cpu");
	if (!ret) {
	of_node_put(np);
	return -ENOENT;
	}

	drv = kzalloc(sizeof(*drv), GFP_KERNEL);
	if (!drv)
	return -ENOMEM;

	match = pdev->dev.platform_data;
	drv->data = match->data;
	if (!drv->data) {
	ret = -ENODEV;
	goto free_drv;
	}

	if (drv->data->get_version) {
	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
	if (IS_ERR(speedbin_nvmem)) {
	if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
	dev_err(cpu_dev,
	"Could not get nvmem cell: %ld\n",
	PTR_ERR(speedbin_nvmem));
	ret = PTR_ERR(speedbin_nvmem);
	goto free_drv;
	}

	ret = drv->data->get_version(cpu_dev,
	speedbin_nvmem, &pvs_name, drv);
	if (ret) {
	nvmem_cell_put(speedbin_nvmem);
	goto free_drv;
	}
	nvmem_cell_put(speedbin_nvmem);
	}
	of_node_put(np);

	drv->names_opp_tables = kcalloc(num_possible_cpus(),
	sizeof(*drv->names_opp_tables),
	GFP_KERNEL);
	if (!drv->names_opp_tables) {
	ret = -ENOMEM;
	goto free_drv;
	}
	drv->hw_opp_tables = kcalloc(num_possible_cpus(),
	sizeof(*drv->hw_opp_tables),
	GFP_KERNEL);
	if (!drv->hw_opp_tables) {
	ret = -ENOMEM;
	goto free_opp_names;
	}

	drv->genpd_opp_tables = kcalloc(num_possible_cpus(),
	sizeof(*drv->genpd_opp_tables),
	GFP_KERNEL);
	if (!drv->genpd_opp_tables) {
	ret = -ENOMEM;
	goto free_opp;
	}

	for_each_possible_cpu(cpu) {
	cpu_dev = get_cpu_device(cpu);
	if (NULL == cpu_dev) {
	ret = -ENODEV;
	goto free_genpd_opp;
	}

	if (drv->data->get_version) {

	if (pvs_name) {
	drv->names_opp_tables[cpu] = dev_pm_opp_set_prop_name(
	cpu_dev,
	pvs_name);
	if (IS_ERR(drv->names_opp_tables[cpu])) {
	ret = PTR_ERR(drv->names_opp_tables[cpu]);
	dev_err(cpu_dev, "Failed to add OPP name %s\n",
	pvs_name);
	goto free_opp;
	}
	}

	drv->hw_opp_tables[cpu] = dev_pm_opp_set_supported_hw(
	cpu_dev, &drv->versions, 1);
	if (IS_ERR(drv->hw_opp_tables[cpu])) {
	ret = PTR_ERR(drv->hw_opp_tables[cpu]);
	dev_err(cpu_dev,
	"Failed to set supported hardware\n");
	goto free_genpd_opp;
	}
	}

	if (drv->data->genpd_names) {
	drv->genpd_opp_tables[cpu] =
	dev_pm_opp_attach_genpd(cpu_dev,
	drv->data->genpd_names,
	NULL);
	if (IS_ERR(drv->genpd_opp_tables[cpu])) {
	ret = PTR_ERR(drv->genpd_opp_tables[cpu]);
	if (ret != -EPROBE_DEFER)
	dev_err(cpu_dev,
	"Could not attach to pm_domain: %d\n",
	ret);
	goto free_genpd_opp;
	}
	}
	}

	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
	NULL, 0);
	if (!IS_ERR(cpufreq_dt_pdev)) {
	platform_set_drvdata(pdev, drv);
	return 0;
	}

	ret = PTR_ERR(cpufreq_dt_pdev);
	dev_err(cpu_dev, "Failed to register platform device\n");

	free_genpd_opp:
	for_each_possible_cpu(cpu) {
	if (IS_ERR_OR_NULL(drv->genpd_opp_tables[cpu]))
	break;
	dev_pm_opp_detach_genpd(drv->genpd_opp_tables[cpu]);
	}
	kfree(drv->genpd_opp_tables);
	free_opp:
	for_each_possible_cpu(cpu) {
	if (IS_ERR_OR_NULL(drv->names_opp_tables[cpu]))
	break;
	dev_pm_opp_put_prop_name(drv->names_opp_tables[cpu]);
	}
	for_each_possible_cpu(cpu) {
	if (IS_ERR_OR_NULL(drv->hw_opp_tables[cpu]))
	break;
	dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
	}
	kfree(drv->hw_opp_tables);
	free_opp_names:
	kfree(drv->names_opp_tables);
	free_drv:
	kfree(drv);

	return ret;
	}

	static int qcom_cpufreq_remove(struct platform_device *pdev)
	{
	struct qcom_cpufreq_drv *drv = platform_get_drvdata(pdev);
	unsigned int cpu;

	platform_device_unregister(cpufreq_dt_pdev);

	for_each_possible_cpu(cpu) {
	if (drv->names_opp_tables[cpu])
	dev_pm_opp_put_supported_hw(drv->names_opp_tables[cpu]);
	if (drv->hw_opp_tables[cpu])
	dev_pm_opp_put_supported_hw(drv->hw_opp_tables[cpu]);
	if (drv->genpd_opp_tables[cpu])
	dev_pm_opp_detach_genpd(drv->genpd_opp_tables[cpu]);
	}

	kfree(drv->names_opp_tables);
	kfree(drv->hw_opp_tables);
	kfree(drv->genpd_opp_tables);
	kfree(drv);

	return 0;
	}

	static struct platform_driver qcom_cpufreq_driver = {
	.probe = qcom_cpufreq_probe,
	.remove = qcom_cpufreq_remove,
	.driver = {
	.name = "qcom-cpufreq-nvmem",
	},
	};

	static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
	{ .compatible = "qcom,apq8096", .data = &match_data_kryo },
	{ .compatible = "qcom,msm8996", .data = &match_data_kryo },
	{ .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
	{ .compatible = "qcom,ipq8064", .data = &match_data_krait },
	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
	{ .compatible = "qcom,msm8960", .data = &match_data_krait },
	{},
	};

	/*
	* Since the driver depends on smem and nvmem drivers, which may
	* return EPROBE_DEFER, all the real activity is done in the probe,
	* which may be defered as well. The init here is only registering
	* the driver and the platform device.
	*/
	static int __init qcom_cpufreq_init(void)
	{
	struct device_node *np = of_find_node_by_path("/");
	const struct of_device_id *match;
	int ret;

	if (!np)
	return -ENODEV;

	match = of_match_node(qcom_cpufreq_match_list, np);
	of_node_put(np);
	if (!match)
	return -ENODEV;

	ret = platform_driver_register(&qcom_cpufreq_driver);
	if (unlikely(ret < 0))
	return ret;

	cpufreq_pdev = platform_device_register_data(NULL, "qcom-cpufreq-nvmem",
	-1, match, sizeof(*match));
	ret = PTR_ERR_OR_ZERO(cpufreq_pdev);
	if (0 == ret)
	return 0;

	platform_driver_unregister(&qcom_cpufreq_driver);
	return ret;
	}
	module_init(qcom_cpufreq_init);

	static void __exit qcom_cpufreq_exit(void)
	{
	platform_device_unregister(cpufreq_pdev);
	platform_driver_unregister(&qcom_cpufreq_driver);
	}
	module_exit(qcom_cpufreq_exit);

	MODULE_DESCRIPTION("Qualcomm Technologies, Inc. CPUfreq driver");
	MODULE_LICENSE("GPL v2");