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[CPUFREQ] S5PV210: Add arm/int voltage control support

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Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Jonghwan Choi 2011-06-24 16:04:14 +09:00 committed by Dave Jones
parent 90d5d0a119
commit e8b4c1986e
1 changed files with 68 additions and 3 deletions
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71
drivers/cpufreq/s5pv210-cpufreq.c
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@ -16,6 +16,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/cpufreq.h>
#include <linux/regulator/consumer.h>
#include <mach/map.h>
#include <mach/regs-clock.h>
@ -77,6 +78,40 @@ static struct cpufreq_frequency_table s5pv210_freq_table[] = {
{0, CPUFREQ_TABLE_END},
};
static struct regulator *arm_regulator;
static struct regulator *int_regulator;
struct s5pv210_dvs_conf {
int arm_volt; /* uV */
int int_volt; /* uV */
};
static const int arm_volt_max = 1350000;
static const int int_volt_max = 1250000;
static struct s5pv210_dvs_conf dvs_conf[] = {
[L0] = {
.arm_volt = 1250000,
.int_volt = 1100000,
},
[L1] = {
.arm_volt = 1200000,
.int_volt = 1100000,
},
[L2] = {
.arm_volt = 1050000,
.int_volt = 1100000,
},
[L3] = {
.arm_volt = 950000,
.int_volt = 1100000,
},
[L4] = {
.arm_volt = 950000,
.int_volt = 1000000,
},
};
static u32 clkdiv_val[5][11] = {
/*
* Clock divider value for following
@ -157,6 +192,8 @@ static int s5pv210_target(struct cpufreq_policy *policy,
unsigned int index, priv_index;
unsigned int pll_changing = 0;
unsigned int bus_speed_changing = 0;
int arm_volt, int_volt;
int ret = 0;
if (relation & ENABLE_FURTHER_CPUFREQ)
no_cpufreq_access = false;
@ -191,12 +228,23 @@ static int s5pv210_target(struct cpufreq_policy *policy,
freqs.old, relation, &priv_index))
return -EINVAL;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
arm_volt = dvs_conf[index].arm_volt;
int_volt = dvs_conf[index].int_volt;
if (freqs.new > freqs.old) {
/* Voltage up: will be implemented */
ret = regulator_set_voltage(arm_regulator,
arm_volt, arm_volt_max);
if (ret)
return ret;
ret = regulator_set_voltage(int_regulator,
int_volt, int_volt_max);
if (ret)
return ret;
}
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* Check if there need to change PLL */
if ((index == L0) || (priv_index == L0))
pll_changing = 1;
@ -408,7 +456,11 @@ static int s5pv210_target(struct cpufreq_policy *policy,
}
if (freqs.new < freqs.old) {
/* Voltage down: will be implemented */
regulator_set_voltage(int_regulator,
int_volt, int_volt_max);
regulator_set_voltage(arm_regulator,
arm_volt, arm_volt_max);
}
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
@ -515,6 +567,19 @@ static struct cpufreq_driver s5pv210_driver = {
static int __init s5pv210_cpufreq_init(void)
{
arm_regulator = regulator_get(NULL, "vddarm");
if (IS_ERR(arm_regulator)) {
pr_err("failed to get regulator vddarm");
return PTR_ERR(arm_regulator);
}
int_regulator = regulator_get(NULL, "vddint");
if (IS_ERR(int_regulator)) {
pr_err("failed to get regulator vddint");
regulator_put(arm_regulator);
return PTR_ERR(int_regulator);
}
return cpufreq_register_driver(&s5pv210_driver);
}