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/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <asm/proc-fns.h>
#include <asm/suspend.h>
#include <soc/qcom/pm.h>
#include <soc/qcom/scm.h>
#include <soc/qcom/scm-boot.h>
#include <soc/qcom/spm.h>
#define SCM_CMD_TERMINATE_PC (0x2)
#define SCM_FLUSH_FLAG_MASK (0x3)
static int set_up_boot_address(void *entry, int cpu)
{
static int flags[NR_CPUS] = {
SCM_FLAG_WARMBOOT_CPU0,
SCM_FLAG_WARMBOOT_CPU1,
SCM_FLAG_WARMBOOT_CPU2,
SCM_FLAG_WARMBOOT_CPU3,
};
static DEFINE_PER_CPU(void *, last_known_entry);
if (entry == per_cpu(last_known_entry, cpu))
return 0;
per_cpu(last_known_entry, cpu) = entry;
return scm_set_boot_addr(virt_to_phys(entry), flags[cpu]);
}
static int msm_pm_collapse(unsigned long int unused)
{
int ret;
enum msm_pm_l2_scm_flag flag;
ret = set_up_boot_address(cpu_resume, raw_smp_processor_id());
if (ret) {
pr_err("Failed to set warm boot address for cpu %d\n",
raw_smp_processor_id());
return ret;
}
flag = MSM_SCM_L2_ON & SCM_FLUSH_FLAG_MASK;
scm_call_atomic1(SCM_SVC_BOOT, SCM_CMD_TERMINATE_PC, flag);
return 0;
}
/**
* msm_cpu_pm_enter_sleep(): Enter a low power mode on current cpu
*
* @mode - sleep mode to enter
*
* The code should be called with interrupts disabled and on the core on
* which the low power mode is to be executed.
*
*/
static int msm_cpu_pm_enter_sleep(enum msm_pm_sleep_mode mode)
{
int ret;
switch (mode) {
case MSM_PM_SLEEP_MODE_SPC:
msm_spm_set_low_power_mode(MSM_SPM_MODE_POWER_COLLAPSE);
ret = cpu_suspend(0, msm_pm_collapse);
break;
default:
case MSM_PM_SLEEP_MODE_WFI:
msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING);
ret = cpu_do_idle();
break;
}
local_irq_enable();
return ret;
}
static struct platform_device qcom_cpuidle_device = {
.name = "qcom_cpuidle",
.id = -1,
.dev.platform_data = msm_cpu_pm_enter_sleep,
};
static int __init msm_pm_device_init(void)
{
platform_device_register(&qcom_cpuidle_device);
return 0;
}
device_initcall(msm_pm_device_init);
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