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/*
* arch/arm/mach-tegra/cpufreq.c
*
* cpufreq driver for NVIDIA Tegra SoCs
*
* Copyright (c) 2008-2009, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include <mach/nvrm_linux.h>
#include <nvrm_power.h>
#include <nvos.h>
NvU32 s_PowerClientId = 0;
static int tegra_verify_speed(struct cpufreq_policy *policy)
{
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
policy->cpuinfo.max_freq);
return 0;
}
static unsigned int tegra_get_speed(unsigned int cpu)
{
NvError Error;
NvRmDfsClockUsage ClocksUsage;
Error = NvRmDfsGetClockUtilization(s_hRmGlobal,
NvRmDfsClockId_Cpu, &ClocksUsage);
if (Error) {
pr_err("%s: NvRmDfsGetClockUtilization() fail 0x%08x \n",
__func__, Error);
return -EINVAL;
}
return ClocksUsage.CurrentKHz;
}
static int tegra_set_policy(struct cpufreq_policy *policy)
{
NvError Error;
pr_debug("%s()++ Cpu %d Req Min:0x%08x Max: 0x%08x\n",
__func__, policy->cpu, policy->min,policy->max);
Error = NvRmDfsSetCpuEnvelope(s_hRmGlobal, policy->min, policy->max);
if (Error) {
pr_err("%s: NvRmDfsSetCpuEnvelope() fail 0x%08x \n",
__func__, Error);
return -EINVAL;
}
pr_debug("%s()-- \n",__func__);
return 0;
}
static int tegra_cpufreq_driver_init(struct cpufreq_policy *policy)
{
NvError Error;
int ret = 0;
NvRmDfsClockUsage ClocksUsage;
pr_debug("tegra_cpufreq_driver_init()++ Cpu %d \n", policy->cpu);
Error = NvRmDfsGetClockUtilization(s_hRmGlobal,
NvRmDfsClockId_Cpu, &ClocksUsage);
if (Error) {
pr_err("%s(): NvRmDfsGetClockUtilization() Error 0x%08x\n",
__func__, Error);
ret = -EINVAL;
goto end;
}
pr_debug("%s: The Min:Max:Curr Freq = 0x%08x:0x%08x:0x%08x\n",
__func__, ClocksUsage.MinKHz, ClocksUsage.MaxKHz,
ClocksUsage.CurrentKHz);
policy->min = ClocksUsage.LowCornerKHz;
policy->max = ClocksUsage.HighCornerKHz;
policy->cur = ClocksUsage.CurrentKHz;
policy->cpuinfo.min_freq = ClocksUsage.MinKHz;
policy->cpuinfo.max_freq = ClocksUsage.MaxKHz;
policy->cpuinfo.transition_latency = 0;
end:
return ret;
}
static struct cpufreq_driver s_tegra_cpufreq_driver = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = tegra_verify_speed,
.setpolicy = tegra_set_policy,
.get = tegra_get_speed,
.init = tegra_cpufreq_driver_init,
.name = "tegra_cpufreq",
.owner = THIS_MODULE,
};
static int __init tegra_cpufreq_init(void)
{
return cpufreq_register_driver(&s_tegra_cpufreq_driver);
}
static void __exit tegra_cpufreq_exit(void)
{
cpufreq_unregister_driver(&s_tegra_cpufreq_driver);
}
MODULE_DESCRIPTION("CPU frequency driver for the Tegra SOC");
MODULE_LICENSE("GPL");
module_init(tegra_cpufreq_init);
module_exit(tegra_cpufreq_exit);
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