forked from Minki/linux
185a23b6e7
Pull cpufreq driver fixes for v5.1 from Viresh Kumar: "This pull request contains minor fixes for ap806 and kryo cpufreq drivers (Julia Lawall and Viresh Kumar)." * 'cpufreq/arm/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm: cpufreq: kryo: Release OPP tables on module removal cpufreq: ap806: add missing of_node_put after of_device_is_available
250 lines
5.9 KiB
C
250 lines
5.9 KiB
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,
|
|
};
|
|
|
|
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;
|
|
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;
|
|
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);
|
|
|
|
opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables), GFP_KERNEL);
|
|
if (!opp_tables)
|
|
return -ENOMEM;
|
|
|
|
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)) {
|
|
platform_set_drvdata(pdev, opp_tables);
|
|
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]);
|
|
}
|
|
kfree(opp_tables);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int qcom_cpufreq_kryo_remove(struct platform_device *pdev)
|
|
{
|
|
struct opp_table **opp_tables = platform_get_drvdata(pdev);
|
|
unsigned int cpu;
|
|
|
|
platform_device_unregister(cpufreq_dt_pdev);
|
|
|
|
for_each_possible_cpu(cpu)
|
|
dev_pm_opp_put_supported_hw(opp_tables[cpu]);
|
|
|
|
kfree(opp_tables);
|
|
|
|
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");
|