// SPDX-License-Identifier: GPL-2.0
|
/*
|
* The sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
|
* provide the OPP framework with required information.
|
*
|
* Copyright (C) 2020 frank@allwinnertech.com
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#include <linux/module.h>
|
#include <linux/nvmem-consumer.h>
|
#include <linux/of_device.h>
|
#include <linux/platform_device.h>
|
#include <linux/pm_opp.h>
|
#include <linux/slab.h>
|
|
#define MAX_NAME_LEN 3
|
|
static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
|
|
struct cpufreq_nvmem_data {
|
u32 nv_speed;
|
u32 nv_Icpu;
|
u32 nv_bin;
|
u32 version;
|
char name[MAX_NAME_LEN];
|
};
|
|
static struct cpufreq_nvmem_data ver_data;
|
|
struct cpufreq_soc_data {
|
void (*nvmem_xlate)(u32 *versions, char *name);
|
bool nvmem_Icpu;
|
bool nvmem_bin;
|
};
|
|
static int sun50i_nvmem_get_data(char *cell_name, u32 *data)
|
{
|
struct nvmem_cell *cell_nvmem;
|
size_t len;
|
u32 *cell_value;
|
struct device_node *np;
|
struct device *cpu_dev;
|
int ret = 0;
|
int ptr;
|
|
cpu_dev = get_cpu_device(0);
|
if (!cpu_dev)
|
return -ENODEV;
|
|
np = of_parse_phandle(cpu_dev->of_node, "operating-points-v2", 0);
|
if (!np)
|
return -ENOENT;
|
|
ptr = of_device_is_compatible(np,
|
"allwinner,sun50i-operating-points");
|
if (!ptr) {
|
ret = -ENOENT;
|
goto err;
|
}
|
|
cell_nvmem = of_nvmem_cell_get(np, cell_name);
|
if (IS_ERR(cell_nvmem)) {
|
if (PTR_ERR(cell_nvmem) != -EPROBE_DEFER)
|
pr_err("Could not get nvmem cell: %ld\n",
|
PTR_ERR(cell_nvmem));
|
ret = PTR_ERR(cell_nvmem);
|
goto err;
|
}
|
|
cell_value = nvmem_cell_read(cell_nvmem, &len);
|
nvmem_cell_put(cell_nvmem);
|
if (IS_ERR(cell_value)) {
|
ret = PTR_ERR(cell_value);
|
goto err;
|
}
|
|
*data = *cell_value;
|
kfree(cell_value);
|
|
err:
|
of_node_put(np);
|
return ret;
|
}
|
|
static void sun50iw9_icpu_xlate(char *prop_name, char *name, u32 i_data)
|
{
|
int value = 0;
|
|
if ((i_data >= 0) && (i_data < 93))
|
value = 0;
|
/*
|
* 150 is temp munber
|
*/
|
else if ((i_data >= 93) && (i_data < 150))
|
value = 1;
|
else if ((i_data >= 150) && (i_data < 271))
|
value = 2;
|
|
snprintf(name, MAX_NAME_LEN, "%s%d", prop_name, value);
|
}
|
|
static void sun50iw9_nvmem_xlate(u32 *versions, char *name)
|
{
|
switch (ver_data.nv_speed) {
|
case 0x2400:
|
case 0x7400:
|
sun50iw9_icpu_xlate("a", name, ver_data.nv_Icpu);
|
break;
|
case 0x2c00:
|
case 0x7c00:
|
sun50iw9_icpu_xlate("b", name, ver_data.nv_Icpu);
|
break;
|
case 0x5000:
|
case 0x5400:
|
case 0x6c00:
|
*versions = 0b0001;
|
break;
|
case 0x5c00:
|
default:
|
*versions = 0b0010;
|
}
|
}
|
|
static struct cpufreq_soc_data sun50iw9_soc_data = {
|
.nvmem_xlate = sun50iw9_nvmem_xlate,
|
.nvmem_Icpu = true,
|
};
|
|
static void sun50iw10_bin_xlate(bool high_speed, char *name, u32 bin)
|
{
|
int value = 0;
|
|
bin >>= 12;
|
|
if (high_speed) {
|
switch (bin) {
|
case 0b100:
|
value = 1;
|
break;
|
default:
|
value = 0;
|
}
|
|
snprintf(name, MAX_NAME_LEN, "b%d", value);
|
} else {
|
switch (bin) {
|
case 0b100:
|
value = 2;
|
break;
|
case 0b010:
|
value = 1;
|
break;
|
default:
|
value = 0;
|
}
|
|
snprintf(name, MAX_NAME_LEN, "a%d", value);
|
}
|
}
|
|
static void sun50iw10_nvmem_xlate(u32 *versions, char *name)
|
{
|
switch (ver_data.nv_speed) {
|
case 0x0800:
|
case 0x1000:
|
case 0x1400:
|
case 0x2000:
|
case 0x4000:
|
sun50iw10_bin_xlate(true, name, ver_data.nv_bin);
|
break;
|
case 0x0400:
|
default:
|
sun50iw10_bin_xlate(false, name, ver_data.nv_bin);
|
}
|
}
|
|
static struct cpufreq_soc_data sun50iw10_soc_data = {
|
.nvmem_xlate = sun50iw10_nvmem_xlate,
|
.nvmem_bin = true,
|
};
|
|
/**
|
* sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
|
* @versions: Set to the value parsed from efuse
|
*
|
* Returns 0 if success.
|
*/
|
static int sun50i_cpufreq_get_efuse(const struct cpufreq_soc_data *soc_data,
|
u32 *versions, char *name)
|
{
|
int ptr;
|
|
ptr = sun50i_nvmem_get_data("speed", &ver_data.nv_speed);
|
if (ptr)
|
return ptr;
|
|
if (soc_data->nvmem_Icpu) {
|
ptr = sun50i_nvmem_get_data("Icpu", &ver_data.nv_Icpu);
|
if (ptr)
|
return ptr;
|
}
|
|
if (soc_data->nvmem_bin) {
|
ptr = sun50i_nvmem_get_data("bin", &ver_data.nv_bin);
|
if (ptr)
|
return ptr;
|
}
|
|
soc_data->nvmem_xlate(versions, name);
|
|
return 0;
|
};
|
|
static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
|
{
|
const struct of_device_id *match;
|
struct opp_table **opp_tables;
|
unsigned int cpu;
|
int ret;
|
|
opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables),
|
GFP_KERNEL);
|
if (!opp_tables)
|
return -ENOMEM;
|
|
match = dev_get_platdata(&pdev->dev);
|
if (!match)
|
return -EINVAL;
|
|
ret = sun50i_cpufreq_get_efuse(match->data,
|
&ver_data.version, ver_data.name);
|
if (ret)
|
return ret;
|
|
for_each_possible_cpu(cpu) {
|
struct device *cpu_dev = get_cpu_device(cpu);
|
|
if (!cpu_dev) {
|
ret = -ENODEV;
|
goto free_opp;
|
}
|
|
if (strlen(ver_data.name)) {
|
ret = dev_pm_opp_set_prop_name(cpu_dev, ver_data.name);
|
if (IS_ERR(opp_tables[cpu])) {
|
ret = PTR_ERR(opp_tables[cpu]);
|
pr_err("Failed to set prop name\n");
|
goto free_opp;
|
}
|
} else if (ver_data.version) {
|
ret = dev_pm_opp_set_supported_hw(cpu_dev, &ver_data.version, 1);
|
if (ret) {
|
dev_err(cpu_dev, "Failed to set supported hardware\n");
|
goto free_opp;
|
}
|
} else
|
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);
|
pr_err("Failed to register platform device\n");
|
|
free_opp:
|
for_each_possible_cpu(cpu) {
|
struct device *cpu_dev = get_cpu_device(cpu);
|
if (IS_ERR_OR_NULL(opp_tables[cpu]))
|
break;
|
|
if (strlen(ver_data.name))
|
dev_pm_opp_put_prop_name(cpu_dev);
|
else if (ver_data.version)
|
dev_pm_opp_put_supported_hw(cpu_dev);
|
}
|
kfree(opp_tables);
|
|
return ret;
|
}
|
|
static int sun50i_cpufreq_nvmem_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) {
|
struct device *cpu_dev = get_cpu_device(cpu);
|
dev_pm_opp_put_supported_hw(cpu_dev);
|
|
if (strlen(ver_data.name))
|
dev_pm_opp_put_prop_name(cpu_dev);
|
else if (ver_data.version)
|
dev_pm_opp_put_supported_hw(cpu_dev);
|
}
|
|
kfree(opp_tables);
|
|
return 0;
|
}
|
|
static struct platform_driver sun50i_cpufreq_driver = {
|
.probe = sun50i_cpufreq_nvmem_probe,
|
.remove = sun50i_cpufreq_nvmem_remove,
|
.driver = {
|
.name = "sun50i-cpufreq-nvmem",
|
},
|
};
|
|
static const struct of_device_id sun50i_cpufreq_match_list[] = {
|
{ .compatible = "arm,sun50iw9p1", .data = &sun50iw9_soc_data, },
|
{ .compatible = "arm,sun50iw10p1", .data = &sun50iw10_soc_data, },
|
{}
|
};
|
|
static const struct of_device_id *sun50i_cpufreq_match_node(void)
|
{
|
const struct of_device_id *match;
|
struct device_node *np;
|
|
np = of_find_node_by_path("/");
|
match = of_match_node(sun50i_cpufreq_match_list, np);
|
of_node_put(np);
|
|
return match;
|
}
|
|
/*
|
* Since the driver depends on 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 sun50i_cpufreq_init(void)
|
{
|
const struct of_device_id *match;
|
int ret;
|
|
match = sun50i_cpufreq_match_node();
|
if (!match)
|
return -ENODEV;
|
|
ret = platform_driver_register(&sun50i_cpufreq_driver);
|
if (unlikely(ret < 0))
|
return ret;
|
|
sun50i_cpufreq_pdev = platform_device_register_data(NULL,
|
"sun50i-cpufreq-nvmem",
|
-1, match,
|
sizeof(*match));
|
ret = PTR_ERR_OR_ZERO(sun50i_cpufreq_pdev);
|
if (ret == 0)
|
return 0;
|
|
platform_driver_unregister(&sun50i_cpufreq_driver);
|
return ret;
|
}
|
module_init(sun50i_cpufreq_init);
|
|
static void __exit sun50i_cpufreq_exit(void)
|
{
|
platform_device_unregister(sun50i_cpufreq_pdev);
|
platform_driver_unregister(&sun50i_cpufreq_driver);
|
}
|
module_exit(sun50i_cpufreq_exit);
|
|
MODULE_DESCRIPTION("Sun50i cpufreq driver");
|
MODULE_LICENSE("GPL v2");
|
