[linux-2.6-block.git] / drivers / cpufreq / qcom-cpufreq-kryo.c

// 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-kryo 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/platform_device.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 platform_device *cpufreq_dt_pdev, *kryo_cpufreq_pdev;

static enum _msm8996_version qcom_cpufreq_kryo_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_probe(struct platform_device *pdev)
{
	struct opp_table *opp_tables[NR_CPUS] = {0};
	enum _msm8996_version msm8996_version;
	struct nvmem_cell *speedbin_nvmem;
	struct device_node *np;
	struct device *cpu_dev;
	unsigned cpu;
	u8 *speedbin;
	u32 versions;
	size_t len;
	int ret;

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

	msm8996_version = qcom_cpufreq_kryo_get_msm_id();
	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
		dev_err(cpu_dev, "Not Snapdragon 820/821!");
		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-kryo-cpu");
	if (!ret) {
		of_node_put(np);
		return -ENOENT;
	}

	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
	of_node_put(np);
	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));
		return PTR_ERR(speedbin_nvmem);
	}

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

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

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

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

	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
							  NULL, 0);
	if (!IS_ERR(cpufreq_dt_pdev))
		return 0;

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

free_opp:
	for_each_possible_cpu(cpu) {
		if (IS_ERR_OR_NULL(opp_tables[cpu]))
			break;
		dev_pm_opp_put_supported_hw(opp_tables[cpu]);
	}

	return ret;
}

static int qcom_cpufreq_kryo_remove(struct platform_device *pdev)
{
	platform_device_unregister(cpufreq_dt_pdev);
	return 0;
}

static struct platform_driver qcom_cpufreq_kryo_driver = {
	.probe = qcom_cpufreq_kryo_probe,
	.remove = qcom_cpufreq_kryo_remove,
	.driver = {
		.name = "qcom-cpufreq-kryo",
	},
};

static const struct of_device_id qcom_cpufreq_kryo_match_list[] __initconst = {
	{ .compatible = "qcom,apq8096", },
	{ .compatible = "qcom,msm8996", },
	{}
};

/*
 * 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_kryo_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_kryo_match_list, np);
	of_node_put(np);
	if (!match)
		return -ENODEV;

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

	kryo_cpufreq_pdev = platform_device_register_simple(
		"qcom-cpufreq-kryo", -1, NULL, 0);
	ret = PTR_ERR_OR_ZERO(kryo_cpufreq_pdev);
	if (0 == ret)
		return 0;

	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
	return ret;
}
module_init(qcom_cpufreq_kryo_init);

static void __exit qcom_cpufreq_kryo_exit(void)
{
	platform_device_unregister(kryo_cpufreq_pdev);
	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
}
module_exit(qcom_cpufreq_kryo_exit);

MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
46e2856b IL	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (c) 2018, The Linux Foundation. All rights reserved.
	4	*/
	5
	6	/*
	7	* In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
	8	* the CPU frequency subset and voltage value of each OPP varies
	9	* based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables
	10	* defines the voltage and frequency value based on the msm-id in SMEM
	11	* and speedbin blown in the efuse combination.
	12	* The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
	13	* to provide the OPP framework with required information.
	14	* This is used to determine the voltage and frequency value for each OPP of
	15	* operating-points-v2 table when it is parsed by the OPP framework.
	16	*/
	17
	18	#include <linux/cpu.h>
	19	#include <linux/err.h>
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/nvmem-consumer.h>
	24	#include <linux/of.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/pm_opp.h>
	27	#include <linux/slab.h>
	28	#include <linux/soc/qcom/smem.h>
	29
	30	#define MSM_ID_SMEM 137
	31
	32	enum _msm_id {
	33	MSM8996V3 = 0xF6ul,
	34	APQ8096V3 = 0x123ul,
	35	MSM8996SG = 0x131ul,
	36	APQ8096SG = 0x138ul,
	37	};
	38
	39	enum _msm8996_version {
	40	MSM8996_V3,
	41	MSM8996_SG,
	42	NUM_OF_MSM8996_VERSIONS,
	43	};
	44
5ad7346b IL	45	struct platform_device cpufreq_dt_pdev, kryo_cpufreq_pdev;
5ad7346b IL	46
d51aea13	47	static enum _msm8996_version qcom_cpufreq_kryo_get_msm_id(void)
46e2856b IL	48	{
	49	size_t len;
	50	u32 *msm_id;
	51	enum _msm8996_version version;
	52
	53	msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
	54	if (IS_ERR(msm_id))
	55	return NUM_OF_MSM8996_VERSIONS;
	56
	57	/* The first 4 bytes are format, next to them is the actual msm-id */
	58	msm_id++;
	59
	60	switch ((enum _msm_id)*msm_id) {
	61	case MSM8996V3:
	62	case APQ8096V3:
	63	version = MSM8996_V3;
	64	break;
	65	case MSM8996SG:
	66	case APQ8096SG:
	67	version = MSM8996_SG;
	68	break;
	69	default:
	70	version = NUM_OF_MSM8996_VERSIONS;
	71	}
	72
	73	return version;
	74	}
	75
	76	static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
	77	{
	78	struct opp_table *opp_tables[NR_CPUS] = {0};
46e2856b IL	79	enum _msm8996_version msm8996_version;
	80	struct nvmem_cell *speedbin_nvmem;
	81	struct device_node *np;
	82	struct device *cpu_dev;
	83	unsigned cpu;
	84	u8 *speedbin;
	85	u32 versions;
	86	size_t len;
	87	int ret;
	88
	89	cpu_dev = get_cpu_device(0);
1dd2058f DC	90	if (!cpu_dev)
1dd2058f DC	91	return -ENODEV;
46e2856b IL	92
	93	msm8996_version = qcom_cpufreq_kryo_get_msm_id();
	94	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
	95	dev_err(cpu_dev, "Not Snapdragon 820/821!");
	96	return -ENODEV;
	97	}
	98
	99	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
1dd2058f DC	100	if (!np)
1dd2058f DC	101	return -ENOENT;
46e2856b IL	102
	103	ret = of_device_is_compatible(np, "operating-points-v2-kryo-cpu");
	104	if (!ret) {
	105	of_node_put(np);
	106	return -ENOENT;
	107	}
	108
	109	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
	110	of_node_put(np);
	111	if (IS_ERR(speedbin_nvmem)) {
f54ab690 NC	112	if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
	113	dev_err(cpu_dev, "Could not get nvmem cell: %ld\n",
	114	PTR_ERR(speedbin_nvmem));
46e2856b IL	115	return PTR_ERR(speedbin_nvmem);
	116	}
	117
	118	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
	119	nvmem_cell_put(speedbin_nvmem);
ee3dbcf9 IL	120	if (IS_ERR(speedbin))
ee3dbcf9 IL	121	return PTR_ERR(speedbin);
46e2856b IL	122
	123	switch (msm8996_version) {
	124	case MSM8996_V3:
	125	versions = 1 << (unsigned int)(*speedbin);
	126	break;
	127	case MSM8996_SG:
	128	versions = 1 << ((unsigned int)(*speedbin) + 4);
	129	break;
	130	default:
	131	BUG();
	132	break;
	133	}
ee3dbcf9	134	kfree(speedbin);
46e2856b IL	135
	136	for_each_possible_cpu(cpu) {
	137	cpu_dev = get_cpu_device(cpu);
	138	if (NULL == cpu_dev) {
	139	ret = -ENODEV;
	140	goto free_opp;
	141	}
	142
	143	opp_tables[cpu] = dev_pm_opp_set_supported_hw(cpu_dev,
	144	&versions, 1);
	145	if (IS_ERR(opp_tables[cpu])) {
	146	ret = PTR_ERR(opp_tables[cpu]);
	147	dev_err(cpu_dev, "Failed to set supported hardware\n");
	148	goto free_opp;
	149	}
	150	}
	151
	152	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
	153	NULL, 0);
	154	if (!IS_ERR(cpufreq_dt_pdev))
	155	return 0;
	156
	157	ret = PTR_ERR(cpufreq_dt_pdev);
	158	dev_err(cpu_dev, "Failed to register platform device\n");
	159
	160	free_opp:
	161	for_each_possible_cpu(cpu) {
	162	if (IS_ERR_OR_NULL(opp_tables[cpu]))
	163	break;
	164	dev_pm_opp_put_supported_hw(opp_tables[cpu]);
	165	}
	166
	167	return ret;
	168	}
	169
5ad7346b IL	170	static int qcom_cpufreq_kryo_remove(struct platform_device *pdev)
	171	{
	172	platform_device_unregister(cpufreq_dt_pdev);
	173	return 0;
	174	}
	175
46e2856b IL	176	static struct platform_driver qcom_cpufreq_kryo_driver = {
46e2856b IL	177	.probe = qcom_cpufreq_kryo_probe,
5ad7346b	178	.remove = qcom_cpufreq_kryo_remove,
46e2856b IL	179	.driver = {
	180	.name = "qcom-cpufreq-kryo",
	181	},
	182	};
	183
	184	static const struct of_device_id qcom_cpufreq_kryo_match_list[] __initconst = {
	185	{ .compatible = "qcom,apq8096", },
	186	{ .compatible = "qcom,msm8996", },
bafaf056	187	{}
46e2856b IL	188	};
	189
	190	/*
	191	* Since the driver depends on smem and nvmem drivers, which may
	192	* return EPROBE_DEFER, all the real activity is done in the probe,
	193	* which may be defered as well. The init here is only registering
	194	* the driver and the platform device.
	195	*/
	196	static int __init qcom_cpufreq_kryo_init(void)
	197	{
	198	struct device_node *np = of_find_node_by_path("/");
	199	const struct of_device_id *match;
	200	int ret;
	201
	202	if (!np)
	203	return -ENODEV;
	204
	205	match = of_match_node(qcom_cpufreq_kryo_match_list, np);
	206	of_node_put(np);
	207	if (!match)
	208	return -ENODEV;
	209
	210	ret = platform_driver_register(&qcom_cpufreq_kryo_driver);
	211	if (unlikely(ret < 0))
	212	return ret;
	213
5ad7346b IL	214	kryo_cpufreq_pdev = platform_device_register_simple(
	215	"qcom-cpufreq-kryo", -1, NULL, 0);
	216	ret = PTR_ERR_OR_ZERO(kryo_cpufreq_pdev);
46e2856b IL	217	if (0 == ret)
	218	return 0;
	219
	220	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
	221	return ret;
	222	}
	223	module_init(qcom_cpufreq_kryo_init);
	224
d51aea13	225	static void __exit qcom_cpufreq_kryo_exit(void)
5ad7346b IL	226	{
	227	platform_device_unregister(kryo_cpufreq_pdev);
	228	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
	229	}
	230	module_exit(qcom_cpufreq_kryo_exit);
	231
46e2856b IL	232	MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
46e2856b IL	233	MODULE_LICENSE("GPL v2");