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/*
* 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/kernel.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <mach/hardware.h>
#include <mach/prcmu.h>
#include <mach/prcmu-regs.h>
static struct cpufreq_frequency_table *freq_table;
static enum arm_opp *idx2opp;
static struct freq_attr *ux500_cpufreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
static int ux500_cpufreq_verify_speed(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, freq_table);
}
extern bool wlan_mode_on;
static int ux500_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct cpufreq_freqs freqs;
unsigned int idx;
/* 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;
/* A work around for wlan performance issues */
if (wlan_mode_on)
target_freq = policy->cpuinfo.max_freq;
/* 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[idx].frequency;
freqs.cpu = policy->cpu;
if (freqs.old == freqs.new)
return 0;
/* pre-change notification */
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* request the PRCM unit for opp change */
if (prcmu_set_arm_opp(idx2opp[idx])) {
pr_err("ux500-cpufreq: Failed to set OPP level\n");
return -EINVAL;
}
/* post change notification */
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
return 0;
}
static unsigned int ux500_cpufreq_getspeed(unsigned int cpu)
{
int 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 ux500_cpufreq_init(struct cpufreq_policy *policy)
{
int res;
int i;
/* get policy fields based on the table */
res = cpufreq_frequency_table_cpuinfo(policy, freq_table);
if (!res)
cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
else {
pr_err("ux500-cpufreq : Failed to read policy table\n");
return res;
}
policy->min = policy->cpuinfo.min_freq;
policy->max = policy->cpuinfo.max_freq;
policy->cur = ux500_cpufreq_getspeed(policy->cpu);
for (i = 0; freq_table[i].frequency != policy->cur; i++)
;
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
/*
* FIXME : Need to take time measurement across the target()
* function with no/some/all drivers in the notification
* list.
*/
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 0;
}
static struct cpufreq_driver ux500_cpufreq_driver = {
.flags = CPUFREQ_STICKY,
.verify = ux500_cpufreq_verify_speed,
.target = ux500_cpufreq_target,
.get = ux500_cpufreq_getspeed,
.init = ux500_cpufreq_init,
.name = "UX500",
.attr = ux500_cpufreq_attr,
};
int __init
ux500_cpufreq_register(struct cpufreq_frequency_table *table,
enum arm_opp *idx2opplist)
{
freq_table = table;
idx2opp = idx2opplist;
if (cpu_is_u8500v1() || ux500_is_svp())
return -ENODEV;
pr_info("cpufreq for ux500 started\n");
return cpufreq_register_driver(&ux500_cpufreq_driver);
}
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