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Add CPUFreq driver #2

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Add CPUFreq driver #2

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fb3e1f8
cpufreq: spacemit: add driver
ziyao233 Dec 16, 2024
6476ab5
riscv: dts: spacemit: correct supply and operating voltage
ziyao233 Dec 16, 2024
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20 changes: 10 additions & 10 deletions arch/riscv/boot/dts/spacemit/k1-x.dtsi
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Original file line number Diff line number Diff line change
Expand Up @@ -417,39 +417,39 @@
opp-hz = /bits/ 64 <1600000000>;
tcm-hz = /bits/ 64 <800000000>;
ace-hz = /bits/ 64 <800000000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp1228800000 {
opp-hz = /bits/ 64 <1228800000>;
tcm-hz = /bits/ 64 <614400000>;
ace-hz = /bits/ 64 <614400000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp1000000000 {
opp-hz = /bits/ 64 <1000000000>;
tcm-hz = /bits/ 64 <500000000>;
ace-hz = /bits/ 64 <500000000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp819000000 {
opp-hz = /bits/ 64 <819000000>;
opp-microvolt = <950000>;
tcm-hz = /bits/ 64 <409500000>;
ace-hz = /bits/ 64 <409500000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp614400000 {
opp-hz = /bits/ 64 <614400000>;
tcm-hz = /bits/ 64 <307200000>;
ace-hz = /bits/ 64 <307200000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};
};
Expand All @@ -465,35 +465,35 @@
opp1600000000 {
opp-hz = /bits/ 64 <1600000000>;
ace-hz = /bits/ 64 <800000000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp1228800000 {
opp-hz = /bits/ 64 <1228800000>;
ace-hz = /bits/ 64 <614400000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp1000000000 {
opp-hz = /bits/ 64 <1000000000>;
ace-hz = /bits/ 64 <500000000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp819000000 {
opp-hz = /bits/ 64 <819000000>;
ace-hz = /bits/ 64 <409500000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};

opp614400000 {
opp-hz = /bits/ 64 <614400000>;
ace-hz = /bits/ 64 <307200000>;
opp-microvolt = <950000>;
opp-microvolt = <950000 950000 1050000>;
clock-latency-ns = <200000>;
};
};
Expand Down
35 changes: 31 additions & 4 deletions arch/riscv/boot/dts/spacemit/k1-x_deb1.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -900,19 +900,46 @@
};

&cpu_0 {
clst0-supply = <&dcdc_1>;
vin-supply-names = "clst0";
cpu-supply = <&dcdc_1>;
};

&cpu_1 {
cpu-supply = <&dcdc_1>;
};

&cpu_2 {
cpu-supply = <&dcdc_1>;
};

&cpu_3 {
cpu-supply = <&dcdc_1>;
};

&cpu_4 {
cpu-supply = <&dcdc_1>;
};

&cpu_5 {
cpu-supply = <&dcdc_1>;
};

&cpu_6 {
cpu-supply = <&dcdc_1>;
};

&cpu_7 {
cpu-supply = <&dcdc_1>;
};

&clst0_core_opp_table {
opp1600000000 {
opp-microvolt = <1050000>;
opp-microvolt = <1050000 950000 1050000>;
};
};

&clst1_core_opp_table {
opp1600000000 {
opp-microvolt = <1050000>;
opp-microvolt = <1050000 950000 1050000>;
};
};

Expand Down
10 changes: 10 additions & 0 deletions drivers/cpufreq/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -272,6 +272,16 @@ config LOONGSON3_CPUFREQ
If in doubt, say N.
endif

if RISCV
config SPACEMIT_CPUFREQ
tristate "SpacemiT CPUFreq Driver"
depends on OF && COMMON_CLK && CPUFREQ_DT
help
This option adds a CPUFreq driver for SpacemiT SoCs.

if in doubt, say N.
endif

if SPARC64
config SPARC_US3_CPUFREQ
tristate "UltraSPARC-III CPU Frequency driver"
Expand Down
1 change: 1 addition & 0 deletions drivers/cpufreq/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,7 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o
obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o
obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o
obj-$(CONFIG_LOONGSON3_CPUFREQ) += loongson3_cpufreq.o
obj-$(CONFIG_SPACEMIT_CPUFREQ) += spacemit-cpufreq.o
obj-$(CONFIG_SH_CPU_FREQ) += sh-cpufreq.o
obj-$(CONFIG_SPARC_US2E_CPUFREQ) += sparc-us2e-cpufreq.o
obj-$(CONFIG_SPARC_US3_CPUFREQ) += sparc-us3-cpufreq.o
164 changes: 164 additions & 0 deletions drivers/cpufreq/spacemit-cpufreq.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,164 @@
// SPDX-License-Identifier: GPL-2.0-only

#include <linux/cpufreq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpumask.h>
#include <linux/clk/clk-conf.h>
#include <linux/pm_qos.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/pm_opp.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/slab.h>
#include "../opp/opp.h"
#include "cpufreq-dt.h"

#define TURBO_FREQUENCY (1600000000)
#define STABLE_FREQUENCY (1200000000)

#define PRODUCT_ID_M1 (0x36070000)

static int spacemit_policy_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
int cpu;
u64 rates;
static int cci_init;
struct clk *cci_clk;
struct device *cpu_dev;
struct cpufreq_policy *policy = data;
struct opp_table *opp_table;

cpu = cpumask_first(policy->related_cpus);
cpu_dev = get_cpu_device(cpu);
opp_table = _find_opp_table(cpu_dev);

if (cci_init == 0) {
cci_clk = of_clk_get_by_name(opp_table->np, "cci");
if (IS_ERR(cci_clk))
return 0;

of_property_read_u64_array(opp_table->np, "cci-hz", &rates, 1);
clk_set_rate(cci_clk, rates);
clk_put(cci_clk);
cci_init = 1;
}

return 0;
}

static int spacemit_processor_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
int cpu;
struct device *cpu_dev;
struct cpufreq_freqs *freqs = (struct cpufreq_freqs *)data;
struct cpufreq_policy *policy = ( struct cpufreq_policy *)freqs->policy;
struct opp_table *opp_table;
struct device_node *np;
struct clk *tcm_clk, *ace0_clk, *ace1_clk;
u64 rates;

cpu = cpumask_first(policy->related_cpus);
cpu_dev = get_cpu_device(cpu);
opp_table = _find_opp_table(cpu_dev);

/* get the tcm/ace clk handler */
tcm_clk = of_clk_get_by_name(opp_table->np, "tcm");
ace0_clk = of_clk_get_by_name(opp_table->np, "ace0");
ace1_clk = of_clk_get_by_name(opp_table->np, "ace1");

if (event == CPUFREQ_PRECHANGE) {
/**
* change the tcm/ace's frequency first.
* binary division is safe
*/
if (!IS_ERR(ace0_clk)) {
clk_set_rate(ace0_clk, clk_get_rate(clk_get_parent(ace0_clk)) / 2);
clk_put(ace0_clk);
}

if (!IS_ERR(ace1_clk)) {
clk_set_rate(ace1_clk, clk_get_rate(clk_get_parent(ace1_clk)) / 2);
clk_put(ace1_clk);
}

if (!IS_ERR(tcm_clk)) {
clk_set_rate(tcm_clk, clk_get_rate(clk_get_parent(tcm_clk)) / 2);
clk_put(tcm_clk);
}

if (freqs->new * 1000 >= TURBO_FREQUENCY) {
if (freqs->old * 1000 >= TURBO_FREQUENCY)
clk_set_rate(opp_table->clk, STABLE_FREQUENCY);
}

}

if (event == CPUFREQ_POSTCHANGE) {
if (!IS_ERR(tcm_clk)) {
clk_get_rate(clk_get_parent(tcm_clk));
/* get the tcm-hz */
of_property_read_u64_array(np, "tcm-hz", &rates, 1);
/* then set rate */
clk_set_rate(tcm_clk, rates);
clk_put(tcm_clk);
}

if (!IS_ERR(ace0_clk)) {
clk_get_rate(clk_get_parent(ace0_clk));
/* get the ace-hz */
of_property_read_u64_array(np, "ace0-hz", &rates, 1);
/* then set rate */
clk_set_rate(ace0_clk, rates);
clk_put(ace0_clk);
}

if (!IS_ERR(ace1_clk)) {
clk_get_rate(clk_get_parent(ace1_clk));
/* get the ace-hz */
of_property_read_u64_array(np, "ace1-hz", &rates, 1);
/* then set rate */
clk_set_rate(ace1_clk, rates);
clk_put(ace1_clk);
}
}

dev_pm_opp_put_opp_table(opp_table);

return 0;
}

static struct notifier_block spacemit_processor_notifier_block = {
.notifier_call = spacemit_processor_notifier,
};

static struct notifier_block spacemit_policy_notifier_block = {
.notifier_call = spacemit_policy_notifier,
};

static int __init spacemit_processor_driver_init(void)
{
int ret;

ret = cpufreq_register_notifier(&spacemit_processor_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
pr_err("register cpufreq notifier failed\n");
return -EINVAL;
}

ret = cpufreq_register_notifier(&spacemit_policy_notifier_block, CPUFREQ_POLICY_NOTIFIER);
if (ret) {
pr_err("register cpufreq notifier failed\n");
return -EINVAL;
}

return 0;
}

arch_initcall(spacemit_processor_driver_init);