// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP
*/
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpufreq.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/regulator/consumer.h>
#include <linux/slab.h>
#include "cpufreq-dt.h"
#define OCOTP_CFG3_SPEED_GRADE_SHIFT 8
#define OCOTP_CFG3_SPEED_GRADE_MASK (0x3 << 8)
#define IMX8MN_OCOTP_CFG3_SPEED_GRADE_MASK (0xf << 8)
#define OCOTP_CFG3_MKT_SEGMENT_SHIFT 6
#define OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 6)
#define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_SHIFT 5
#define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 5)
#define IMX7ULP_MAX_RUN_FREQ 528000
/* cpufreq-dt device registered by imx-cpufreq-dt */
static struct platform_device *cpufreq_dt_pdev;
static struct device *cpu_dev;
static int cpufreq_opp_token;
enum IMX7ULP_CPUFREQ_CLKS {
ARM,
CORE,
SCS_SEL,
HSRUN_CORE,
HSRUN_SCS_SEL,
FIRC,
};
static struct clk_bulk_data imx7ulp_clks[] = {
{ .id = "arm" },
{ .id = "core" },
{ .id = "scs_sel" },
{ .id = "hsrun_core" },
{ .id = "hsrun_scs_sel" },
{ .id = "firc" },
};
static unsigned int imx7ulp_get_intermediate(struct cpufreq_policy *policy,
unsigned int index)
{
return clk_get_rate(imx7ulp_clks[FIRC].clk);
}
static int imx7ulp_target_intermediate(struct cpufreq_policy *policy,
unsigned int index)
{
unsigned int newfreq = policy->freq_table[index].frequency;
clk_set_parent(imx7ulp_clks[SCS_SEL].clk, imx7ulp_clks[FIRC].clk);
clk_set_parent(imx7ulp_clks[HSRUN_SCS_SEL].clk, imx7ulp_clks[FIRC].clk);
if (newfreq > IMX7ULP_MAX_RUN_FREQ)
clk_set_parent(imx7ulp_clks[ARM].clk,
imx7ulp_clks[HSRUN_CORE].clk);
else
clk_set_parent(imx7ulp_clks[ARM].clk, imx7ulp_clks[CORE].clk);
return 0;
}
static struct cpufreq_dt_platform_data imx7ulp_data = {
.target_intermediate = imx7ulp_target_intermediate,
.get_intermediate = imx7ulp_get_intermediate,
};
static int imx_cpufreq_dt_probe(struct platform_device *pdev)
{
struct platform_device *dt_pdev;
u32 cell_value, supported_hw[2];
int speed_grade, mkt_segment;
int ret;
cpu_dev = get_cpu_device(0);
if (!of_property_present(cpu_dev->of_node, "cpu-supply"))
return -ENODEV;
if (of_machine_is_compatible("fsl,imx7ulp")) {
ret = clk_bulk_get(cpu_dev, ARRAY_SIZE(imx7ulp_clks),
imx7ulp_clks);
if (ret)
return ret;
dt_pdev = platform_device_register_data(NULL, "cpufreq-dt",
-1, &imx7ulp_data,
sizeof(imx7ulp_data));
if (IS_ERR(dt_pdev)) {
clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks);
ret = PTR_ERR(dt_pdev);
dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret);
return ret;
}
cpufreq_dt_pdev = dt_pdev;
return 0;
}
ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value);
if (ret)
return ret;
if (of_machine_is_compatible("fsl,imx8mn") ||
of_machine_is_compatible("fsl,imx8mp"))
speed_grade = (cell_value & IMX8MN_OCOTP_CFG3_SPEED_GRADE_MASK)
>> OCOTP_CFG3_SPEED_GRADE_SHIFT;
else
speed_grade = (cell_value & OCOTP_CFG3_SPEED_GRADE_MASK)
>> OCOTP_CFG3_SPEED_GRADE_SHIFT;
if (of_machine_is_compatible("fsl,imx8mp"))
mkt_segment = (cell_value & IMX8MP_OCOTP_CFG3_MKT_SEGMENT_MASK)
>> IMX8MP_OCOTP_CFG3_MKT_SEGMENT_SHIFT;
else
mkt_segment = (cell_value & OCOTP_CFG3_MKT_SEGMENT_MASK)
>> OCOTP_CFG3_MKT_SEGMENT_SHIFT;
/*
* Early samples without fuses written report "0 0" which may NOT
* match any OPP defined in DT. So clamp to minimum OPP defined in
* DT to avoid warning for "no OPPs".
*
* Applies to i.MX8M series SoCs.
*/
if (mkt_segment == 0 && speed_grade == 0) {
if (of_machine_is_compatible("fsl,imx8mm") ||
of_machine_is_compatible("fsl,imx8mq"))
speed_grade = 1;
if (of_machine_is_compatible("fsl,imx8mn") ||
of_machine_is_compatible("fsl,imx8mp"))
speed_grade = 0xb;
}
supported_hw[0] = BIT(speed_grade);
supported_hw[1] = BIT(mkt_segment);
dev_info(&pdev->dev, "cpu speed grade %d mkt segment %d supported-hw %#x %#x\n",
speed_grade, mkt_segment, supported_hw[0], supported_hw[1]);
cpufreq_opp_token = dev_pm_opp_set_supported_hw(cpu_dev, supported_hw, 2);
if (cpufreq_opp_token < 0) {
ret = cpufreq_opp_token;
dev_err(&pdev->dev, "Failed to set supported opp: %d\n", ret);
return ret;
}
cpufreq_dt_pdev = platform_device_register_data(
&pdev->dev, "cpufreq-dt", -1, NULL, 0);
if (IS_ERR(cpufreq_dt_pdev)) {
dev_pm_opp_put_supported_hw(cpufreq_opp_token);
ret = PTR_ERR(cpufreq_dt_pdev);
dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret);
return ret;
}
return 0;
}
static void imx_cpufreq_dt_remove(struct platform_device *pdev)
{
platform_device_unregister(cpufreq_dt_pdev);
if (!of_machine_is_compatible("fsl,imx7ulp"))
dev_pm_opp_put_supported_hw(cpufreq_opp_token);
else
clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks);
}
static struct platform_driver imx_cpufreq_dt_driver = {
.probe = imx_cpufreq_dt_probe,
.remove_new = imx_cpufreq_dt_remove,
.driver = {
.name = "imx-cpufreq-dt",
},
};
module_platform_driver(imx_cpufreq_dt_driver);
MODULE_ALIAS("platform:imx-cpufreq-dt");
MODULE_DESCRIPTION("Freescale i.MX cpufreq speed grading driver");
MODULE_LICENSE("GPL v2");
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