2005-07-10 20:58:20 +02:00
|
|
|
/*
|
|
|
|
* CPU frequency scaling for OMAP
|
|
|
|
*
|
|
|
|
* Copyright (C) 2005 Nokia Corporation
|
|
|
|
* Written by Tony Lindgren <tony@atomide.com>
|
|
|
|
*
|
|
|
|
* Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
|
|
|
|
*
|
2010-08-12 02:02:43 +02:00
|
|
|
* Copyright (C) 2007-2011 Texas Instruments, Inc.
|
|
|
|
* - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
|
|
|
|
*
|
2005-07-10 20:58:20 +02:00
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/cpufreq.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/err.h>
|
2006-01-07 17:15:52 +01:00
|
|
|
#include <linux/clk.h>
|
2008-09-06 13:10:45 +02:00
|
|
|
#include <linux/io.h>
|
2010-08-12 02:02:43 +02:00
|
|
|
#include <linux/opp.h>
|
2011-09-22 01:53:00 +02:00
|
|
|
#include <linux/cpu.h>
|
2005-07-10 20:58:20 +02:00
|
|
|
|
|
|
|
#include <asm/system.h>
|
2010-08-12 02:02:43 +02:00
|
|
|
#include <asm/smp_plat.h>
|
2011-09-22 01:53:00 +02:00
|
|
|
#include <asm/cpu.h>
|
2005-07-10 20:58:20 +02:00
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
#include <plat/clock.h>
|
|
|
|
#include <plat/omap-pm.h>
|
|
|
|
#include <plat/common.h>
|
2006-06-27 01:16:17 +02:00
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
#include <mach/hardware.h>
|
2009-01-28 03:13:38 +01:00
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
#define VERY_HI_RATE 900000000
|
2006-06-27 01:16:17 +02:00
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
struct lpj_info {
|
|
|
|
unsigned long ref;
|
|
|
|
unsigned int freq;
|
|
|
|
};
|
|
|
|
|
|
|
|
static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
|
|
|
|
static struct lpj_info global_lpj_ref;
|
|
|
|
#endif
|
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
static struct cpufreq_frequency_table *freq_table;
|
2007-08-30 11:46:39 +02:00
|
|
|
static struct clk *mpu_clk;
|
2011-05-26 01:38:46 +02:00
|
|
|
static char *mpu_clk_name;
|
2007-08-30 11:46:39 +02:00
|
|
|
|
2010-10-08 19:00:19 +02:00
|
|
|
static int omap_verify_speed(struct cpufreq_policy *policy)
|
2005-07-10 20:58:20 +02:00
|
|
|
{
|
2009-01-28 03:13:38 +01:00
|
|
|
if (freq_table)
|
|
|
|
return cpufreq_frequency_table_verify(policy, freq_table);
|
|
|
|
|
2005-07-10 20:58:20 +02:00
|
|
|
if (policy->cpu)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
|
|
policy->cpuinfo.max_freq);
|
2007-08-30 11:46:39 +02:00
|
|
|
|
2005-07-10 20:58:20 +02:00
|
|
|
policy->min = clk_round_rate(mpu_clk, policy->min * 1000) / 1000;
|
|
|
|
policy->max = clk_round_rate(mpu_clk, policy->max * 1000) / 1000;
|
|
|
|
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
|
|
|
|
policy->cpuinfo.max_freq);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-10-08 19:00:19 +02:00
|
|
|
static unsigned int omap_getspeed(unsigned int cpu)
|
2005-07-10 20:58:20 +02:00
|
|
|
{
|
|
|
|
unsigned long rate;
|
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
if (cpu >= NR_CPUS)
|
2005-07-10 20:58:20 +02:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
rate = clk_get_rate(mpu_clk) / 1000;
|
|
|
|
return rate;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int omap_target(struct cpufreq_policy *policy,
|
|
|
|
unsigned int target_freq,
|
|
|
|
unsigned int relation)
|
|
|
|
{
|
2011-09-22 01:53:00 +02:00
|
|
|
int i, ret = 0;
|
2010-08-12 02:02:43 +02:00
|
|
|
struct cpufreq_freqs freqs;
|
2005-07-10 20:58:20 +02:00
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
/* Ensure desired rate is within allowed range. Some govenors
|
|
|
|
* (ondemand) will just pass target_freq=0 to get the minimum. */
|
2009-06-23 11:53:29 +02:00
|
|
|
if (target_freq < policy->min)
|
|
|
|
target_freq = policy->min;
|
|
|
|
if (target_freq > policy->max)
|
|
|
|
target_freq = policy->max;
|
2009-01-28 03:13:38 +01:00
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
freqs.old = omap_getspeed(policy->cpu);
|
2005-07-10 20:58:20 +02:00
|
|
|
freqs.new = clk_round_rate(mpu_clk, target_freq * 1000) / 1000;
|
2011-09-22 01:53:00 +02:00
|
|
|
freqs.cpu = policy->cpu;
|
2005-07-10 20:58:20 +02:00
|
|
|
|
2011-06-07 04:05:29 +02:00
|
|
|
if (freqs.old == freqs.new && policy->cur == freqs.new)
|
2009-01-28 03:13:38 +01:00
|
|
|
return ret;
|
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
/* notifiers */
|
|
|
|
for_each_cpu(i, policy->cpus) {
|
|
|
|
freqs.cpu = i;
|
|
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
|
|
|
}
|
2010-08-12 02:02:43 +02:00
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
#ifdef CONFIG_CPU_FREQ_DEBUG
|
2010-08-12 02:02:43 +02:00
|
|
|
pr_info("cpufreq-omap: transition: %u --> %u\n", freqs.old, freqs.new);
|
2009-01-28 03:13:38 +01:00
|
|
|
#endif
|
2010-08-12 02:02:43 +02:00
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
ret = clk_set_rate(mpu_clk, freqs.new * 1000);
|
2011-09-22 01:53:00 +02:00
|
|
|
freqs.new = omap_getspeed(policy->cpu);
|
|
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/*
|
|
|
|
* Note that loops_per_jiffy is not updated on SMP systems in
|
|
|
|
* cpufreq driver. So, update the per-CPU loops_per_jiffy value
|
|
|
|
* on frequency transition. We need to update all dependent CPUs.
|
|
|
|
*/
|
|
|
|
for_each_cpu(i, policy->cpus) {
|
|
|
|
struct lpj_info *lpj = &per_cpu(lpj_ref, i);
|
|
|
|
if (!lpj->freq) {
|
|
|
|
lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
|
|
|
|
lpj->freq = freqs.old;
|
|
|
|
}
|
|
|
|
|
|
|
|
per_cpu(cpu_data, i).loops_per_jiffy =
|
|
|
|
cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
|
|
|
|
}
|
2010-08-12 02:02:43 +02:00
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
/* And don't forget to adjust the global one */
|
|
|
|
if (!global_lpj_ref.freq) {
|
|
|
|
global_lpj_ref.ref = loops_per_jiffy;
|
|
|
|
global_lpj_ref.freq = freqs.old;
|
|
|
|
}
|
|
|
|
loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
|
|
|
|
freqs.new);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* notifiers */
|
|
|
|
for_each_cpu(i, policy->cpus) {
|
|
|
|
freqs.cpu = i;
|
|
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
|
|
|
}
|
2005-07-10 20:58:20 +02:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-03-02 23:41:46 +01:00
|
|
|
static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
|
2005-07-10 20:58:20 +02:00
|
|
|
{
|
2009-01-28 03:13:38 +01:00
|
|
|
int result = 0;
|
2010-08-12 02:02:43 +02:00
|
|
|
struct device *mpu_dev;
|
|
|
|
|
2011-05-26 01:38:46 +02:00
|
|
|
mpu_clk = clk_get(NULL, mpu_clk_name);
|
2005-07-10 20:58:20 +02:00
|
|
|
if (IS_ERR(mpu_clk))
|
|
|
|
return PTR_ERR(mpu_clk);
|
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
if (policy->cpu >= NR_CPUS)
|
2005-07-10 20:58:20 +02:00
|
|
|
return -EINVAL;
|
2009-01-28 03:13:38 +01:00
|
|
|
|
2011-09-22 01:53:00 +02:00
|
|
|
policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);
|
2010-08-12 02:02:43 +02:00
|
|
|
mpu_dev = omap2_get_mpuss_device();
|
2011-09-22 01:53:00 +02:00
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
if (!mpu_dev) {
|
|
|
|
pr_warning("%s: unable to get the mpu device\n", __func__);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
opp_init_cpufreq_table(mpu_dev, &freq_table);
|
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
if (freq_table) {
|
|
|
|
result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
|
|
|
|
if (!result)
|
|
|
|
cpufreq_frequency_table_get_attr(freq_table,
|
|
|
|
policy->cpu);
|
|
|
|
} else {
|
|
|
|
policy->cpuinfo.min_freq = clk_round_rate(mpu_clk, 0) / 1000;
|
|
|
|
policy->cpuinfo.max_freq = clk_round_rate(mpu_clk,
|
|
|
|
VERY_HI_RATE) / 1000;
|
|
|
|
}
|
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
policy->min = policy->cpuinfo.min_freq;
|
|
|
|
policy->max = policy->cpuinfo.max_freq;
|
2011-09-22 01:53:00 +02:00
|
|
|
policy->cur = omap_getspeed(policy->cpu);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* On OMAP SMP configuartion, both processors share the voltage
|
|
|
|
* and clock. So both CPUs needs to be scaled together and hence
|
|
|
|
* needs software co-ordination. Use cpufreq affected_cpus
|
|
|
|
* interface to handle this scenario. Additional is_smp() check
|
|
|
|
* is to keep SMP_ON_UP build working.
|
|
|
|
*/
|
|
|
|
if (is_smp()) {
|
|
|
|
policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
|
2011-06-07 22:57:52 +02:00
|
|
|
cpumask_setall(policy->cpus);
|
2011-09-22 01:53:00 +02:00
|
|
|
}
|
2010-08-12 02:02:43 +02:00
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
/* FIXME: what's the actual transition time? */
|
2009-11-11 20:00:38 +01:00
|
|
|
policy->cpuinfo.transition_latency = 300 * 1000;
|
2005-07-10 20:58:20 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-08-30 11:46:39 +02:00
|
|
|
static int omap_cpu_exit(struct cpufreq_policy *policy)
|
|
|
|
{
|
2010-01-08 23:23:16 +01:00
|
|
|
clk_exit_cpufreq_table(&freq_table);
|
2007-08-30 11:46:39 +02:00
|
|
|
clk_put(mpu_clk);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-01-28 03:13:38 +01:00
|
|
|
static struct freq_attr *omap_cpufreq_attr[] = {
|
|
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
2005-07-10 20:58:20 +02:00
|
|
|
static struct cpufreq_driver omap_driver = {
|
|
|
|
.flags = CPUFREQ_STICKY,
|
|
|
|
.verify = omap_verify_speed,
|
|
|
|
.target = omap_target,
|
|
|
|
.get = omap_getspeed,
|
|
|
|
.init = omap_cpu_init,
|
2007-08-30 11:46:39 +02:00
|
|
|
.exit = omap_cpu_exit,
|
2005-07-10 20:58:20 +02:00
|
|
|
.name = "omap",
|
2009-01-28 03:13:38 +01:00
|
|
|
.attr = omap_cpufreq_attr,
|
2005-07-10 20:58:20 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init omap_cpufreq_init(void)
|
|
|
|
{
|
2011-05-26 01:38:46 +02:00
|
|
|
if (cpu_is_omap24xx())
|
|
|
|
mpu_clk_name = "virt_prcm_set";
|
|
|
|
else if (cpu_is_omap34xx())
|
|
|
|
mpu_clk_name = "dpll1_ck";
|
|
|
|
else if (cpu_is_omap44xx())
|
|
|
|
mpu_clk_name = "dpll_mpu_ck";
|
|
|
|
|
|
|
|
if (!mpu_clk_name) {
|
|
|
|
pr_err("%s: unsupported Silicon?\n", __func__);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2005-07-10 20:58:20 +02:00
|
|
|
return cpufreq_register_driver(&omap_driver);
|
|
|
|
}
|
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
static void __exit omap_cpufreq_exit(void)
|
|
|
|
{
|
|
|
|
cpufreq_unregister_driver(&omap_driver);
|
|
|
|
}
|
2009-01-28 03:13:38 +01:00
|
|
|
|
2010-08-12 02:02:43 +02:00
|
|
|
MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(omap_cpufreq_init);
|
|
|
|
module_exit(omap_cpufreq_exit);
|