linux-imx

// 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,

};

​

static 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;