cpufreq: update DB8500 cpufreq driver
This updates the ux500 cpufreq driver to the new interface from the updated DB8500 PRCMU Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Dave Jones <davej@redhat.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij
Родитель
46936340c4
Коммит
72b2fd5cb8
|
|
@ -1,134 +1,118 @@
|
|||
/*
|
||||
* CPU frequency scaling for u8500
|
||||
* Inspired by linux/arch/arm/mach-davinci/cpufreq.c
|
||||
*
|
||||
* Copyright (C) STMicroelectronics 2009
|
||||
* Copyright (C) ST-Ericsson SA 2010
|
||||
*
|
||||
* License Terms: GNU General Public License v2
|
||||
*
|
||||
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
|
||||
* Author: Martin Persson <martin.persson@stericsson.com>
|
||||
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/cpufreq.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/mfd/db8500-prcmu.h>
|
||||
|
||||
#include <mach/hardware.h>
|
||||
|
||||
#define DRIVER_NAME "cpufreq-u8500"
|
||||
#define CPUFREQ_NAME "u8500"
|
||||
|
||||
static struct device *dev;
|
||||
#include <mach/id.h>
|
||||
|
||||
static struct cpufreq_frequency_table freq_table[] = {
|
||||
[0] = {
|
||||
.index = 0,
|
||||
.frequency = 200000,
|
||||
.frequency = 300000,
|
||||
},
|
||||
[1] = {
|
||||
.index = 1,
|
||||
.frequency = 300000,
|
||||
},
|
||||
[2] = {
|
||||
.index = 2,
|
||||
.frequency = 600000,
|
||||
},
|
||||
[2] = {
|
||||
/* Used for MAX_OPP, if available */
|
||||
.index = 2,
|
||||
.frequency = CPUFREQ_TABLE_END,
|
||||
},
|
||||
[3] = {
|
||||
/* Used for CPU_OPP_MAX, if available */
|
||||
.index = 3,
|
||||
.frequency = CPUFREQ_TABLE_END,
|
||||
},
|
||||
[4] = {
|
||||
.index = 4,
|
||||
.frequency = CPUFREQ_TABLE_END,
|
||||
},
|
||||
};
|
||||
|
||||
static enum prcmu_cpu_opp index2opp[] = {
|
||||
CPU_OPP_EXT_CLK,
|
||||
CPU_OPP_50,
|
||||
CPU_OPP_100,
|
||||
CPU_OPP_MAX
|
||||
static enum arm_opp idx2opp[] = {
|
||||
ARM_50_OPP,
|
||||
ARM_100_OPP,
|
||||
ARM_MAX_OPP
|
||||
};
|
||||
|
||||
static int u8500_cpufreq_verify_speed(struct cpufreq_policy *policy)
|
||||
static struct freq_attr *db8500_cpufreq_attr[] = {
|
||||
&cpufreq_freq_attr_scaling_available_freqs,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static int db8500_cpufreq_verify_speed(struct cpufreq_policy *policy)
|
||||
{
|
||||
return cpufreq_frequency_table_verify(policy, freq_table);
|
||||
}
|
||||
|
||||
static int u8500_cpufreq_target(struct cpufreq_policy *policy,
|
||||
static int db8500_cpufreq_target(struct cpufreq_policy *policy,
|
||||
unsigned int target_freq,
|
||||
unsigned int relation)
|
||||
{
|
||||
struct cpufreq_freqs freqs;
|
||||
unsigned int index;
|
||||
int ret = 0;
|
||||
unsigned int idx;
|
||||
|
||||
/*
|
||||
* Ensure desired rate is within allowed range. Some govenors
|
||||
* (ondemand) will just pass target_freq=0 to get the minimum.
|
||||
*/
|
||||
/* scale the target frequency to one of the extremes supported */
|
||||
if (target_freq < policy->cpuinfo.min_freq)
|
||||
target_freq = policy->cpuinfo.min_freq;
|
||||
if (target_freq > policy->cpuinfo.max_freq)
|
||||
target_freq = policy->cpuinfo.max_freq;
|
||||
|
||||
ret = cpufreq_frequency_table_target(policy, freq_table,
|
||||
target_freq, relation, &index);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Could not look up next frequency\n");
|
||||
return ret;
|
||||
/* Lookup the next frequency */
|
||||
if (cpufreq_frequency_table_target
|
||||
(policy, freq_table, target_freq, relation, &idx)) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
freqs.old = policy->cur;
|
||||
freqs.new = freq_table[index].frequency;
|
||||
freqs.new = freq_table[idx].frequency;
|
||||
freqs.cpu = policy->cpu;
|
||||
|
||||
if (freqs.old == freqs.new) {
|
||||
dev_dbg(dev, "Current and target frequencies are equal\n");
|
||||
if (freqs.old == freqs.new)
|
||||
return 0;
|
||||
}
|
||||
|
||||
dev_dbg(dev, "transition: %u --> %u\n", freqs.old, freqs.new);
|
||||
/* pre-change notification */
|
||||
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
||||
|
||||
ret = prcmu_set_cpu_opp(index2opp[index]);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "Failed to set OPP level\n");
|
||||
return ret;
|
||||
/* request the PRCM unit for opp change */
|
||||
if (prcmu_set_arm_opp(idx2opp[idx])) {
|
||||
pr_err("db8500-cpufreq: Failed to set OPP level\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* post change notification */
|
||||
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
||||
|
||||
return ret;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned int u8500_cpufreq_getspeed(unsigned int cpu)
|
||||
static unsigned int db8500_cpufreq_getspeed(unsigned int cpu)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; prcmu_get_cpu_opp() != index2opp[i]; i++)
|
||||
/* request the prcm to get the current ARM opp */
|
||||
for (i = 0; prcmu_get_arm_opp() != idx2opp[i]; i++)
|
||||
;
|
||||
return freq_table[i].frequency;
|
||||
}
|
||||
|
||||
static int __cpuinit u8500_cpu_init(struct cpufreq_policy *policy)
|
||||
static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy)
|
||||
{
|
||||
int res;
|
||||
int i;
|
||||
|
||||
BUILD_BUG_ON(ARRAY_SIZE(index2opp) + 1 != ARRAY_SIZE(freq_table));
|
||||
BUILD_BUG_ON(ARRAY_SIZE(idx2opp) + 1 != ARRAY_SIZE(freq_table));
|
||||
|
||||
if (cpu_is_u8500v2()) {
|
||||
freq_table[1].frequency = 400000;
|
||||
freq_table[2].frequency = 800000;
|
||||
if (cpu_is_u8500v2() && !prcmu_is_u8400()) {
|
||||
freq_table[0].frequency = 400000;
|
||||
freq_table[1].frequency = 800000;
|
||||
if (prcmu_has_arm_maxopp())
|
||||
freq_table[3].frequency = 1000000;
|
||||
freq_table[2].frequency = 1000000;
|
||||
}
|
||||
|
||||
/* get policy fields based on the table */
|
||||
|
|
@ -136,13 +120,17 @@ static int __cpuinit u8500_cpu_init(struct cpufreq_policy *policy)
|
|||
if (!res)
|
||||
cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
|
||||
else {
|
||||
dev_err(dev, "u8500-cpufreq : Failed to read policy table\n");
|
||||
pr_err("db8500-cpufreq : Failed to read policy table\n");
|
||||
return res;
|
||||
}
|
||||
|
||||
policy->min = policy->cpuinfo.min_freq;
|
||||
policy->max = policy->cpuinfo.max_freq;
|
||||
policy->cur = u8500_cpufreq_getspeed(policy->cpu);
|
||||
policy->cur = db8500_cpufreq_getspeed(policy->cpu);
|
||||
|
||||
for (i = 0; freq_table[i].frequency != policy->cur; i++)
|
||||
;
|
||||
|
||||
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
|
||||
|
||||
/*
|
||||
|
|
@ -150,61 +138,32 @@ static int __cpuinit u8500_cpu_init(struct cpufreq_policy *policy)
|
|||
* function with no/some/all drivers in the notification
|
||||
* list.
|
||||
*/
|
||||
policy->cpuinfo.transition_latency = 200 * 1000; /* in ns */
|
||||
policy->cpuinfo.transition_latency = 20 * 1000; /* in ns */
|
||||
|
||||
/* policy sharing between dual CPUs */
|
||||
cpumask_copy(policy->cpus, &cpu_present_map);
|
||||
|
||||
policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static struct freq_attr *u8500_cpufreq_attr[] = {
|
||||
&cpufreq_freq_attr_scaling_available_freqs,
|
||||
NULL,
|
||||
};
|
||||
static int u8500_cpu_exit(struct cpufreq_policy *policy)
|
||||
{
|
||||
cpufreq_frequency_table_put_attr(policy->cpu);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct cpufreq_driver u8500_driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.flags = CPUFREQ_STICKY,
|
||||
.verify = u8500_cpufreq_verify_speed,
|
||||
.target = u8500_cpufreq_target,
|
||||
.get = u8500_cpufreq_getspeed,
|
||||
.init = u8500_cpu_init,
|
||||
.exit = u8500_cpu_exit,
|
||||
.name = CPUFREQ_NAME,
|
||||
.attr = u8500_cpufreq_attr,
|
||||
static struct cpufreq_driver db8500_cpufreq_driver = {
|
||||
.flags = CPUFREQ_STICKY,
|
||||
.verify = db8500_cpufreq_verify_speed,
|
||||
.target = db8500_cpufreq_target,
|
||||
.get = db8500_cpufreq_getspeed,
|
||||
.init = db8500_cpufreq_init,
|
||||
.name = "DB8500",
|
||||
.attr = db8500_cpufreq_attr,
|
||||
};
|
||||
|
||||
static int __init u8500_cpufreq_probe(struct platform_device *pdev)
|
||||
static int __init db8500_cpufreq_register(void)
|
||||
{
|
||||
dev = &pdev->dev;
|
||||
return cpufreq_register_driver(&u8500_driver);
|
||||
if (!cpu_is_u8500v20_or_later())
|
||||
return -ENODEV;
|
||||
|
||||
pr_info("cpufreq for DB8500 started\n");
|
||||
return cpufreq_register_driver(&db8500_cpufreq_driver);
|
||||
}
|
||||
|
||||
static int __exit u8500_cpufreq_remove(struct platform_device *pdev)
|
||||
{
|
||||
return cpufreq_unregister_driver(&u8500_driver);
|
||||
}
|
||||
|
||||
static struct platform_driver u8500_cpufreq_driver = {
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.remove = __exit_p(u8500_cpufreq_remove),
|
||||
};
|
||||
|
||||
static int __init u8500_cpufreq_init(void)
|
||||
{
|
||||
return platform_driver_probe(&u8500_cpufreq_driver,
|
||||
&u8500_cpufreq_probe);
|
||||
}
|
||||
|
||||
device_initcall(u8500_cpufreq_init);
|
||||
device_initcall(db8500_cpufreq_register);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче