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/*
* Spreadtrum ARM64 CPU idle driver.
*
* Copyright (C) 2014 Spreadtrum Ltd.
* Author: Icy Zhu <icy.zhu@spreadtrum.com>
*
* 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/cpuidle.h>
#include <linux/cpumask.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/time.h>
#include <asm/psci.h>
#include <asm/suspend.h>
#include <soc/sprd/hardware.h>
#include <soc/sprd/sci_glb_regs.h>
#include <soc/sprd/sci.h>
#include <soc/sprd/cpuidle.h>
#include "of_idle_states.h"
enum {
STANDBY = 0, /* WFI */
L_SLEEP, /* Light Sleep, WFI & DDR Self-refresh & MCU_SYS_SLEEP */
CORE_PD, /* Core power down & Lightsleep */
CLUSTER_PD, /* Cluster power down & Lightsleep */
TOP_PD, /* Top Power Down & Lightsleep */
};
#define LITTLE_CORE_STATUS_MASK 0x000ffff0
#define BIG_CORE_STATUS_MASK 0x0ffff000
#ifdef CONFIG_MACH_SP9838AEA_5MOD
static int idx_max = 2;
#else
static int idx_max = 4;
#endif
static int cpuidle_debug = 0;
static int cpuidle_count;
static volatile void *pmu_status;
/* Cpuidle states debug, set a max state for every cpu can be enter */
module_param_named(idx_max, idx_max, int, S_IRUGO | S_IWUSR);
/* For cpuidle debug, set 1 to view every cpu idle states */
module_param_named(cpuidle_debug, cpuidle_debug, int, S_IRUGO | S_IWUSR);
extern void light_sleep_en(void);
extern void light_sleep_dis(void);
static int just_core_0_power_on(void)
{
if ((sci_glb_read(REG_PMU_APB_PWR_STATUS0_DBG, LITTLE_CORE_STATUS_MASK) == 0x77700) &&
(sci_glb_read(REG_PMU_APB_PWR_STATUS3_DBG, BIG_CORE_STATUS_MASK) == 0x7777000))
return 1;
else
return 0;
}
/*
* arm_enter_idle_state - Programs CPU to enter the specified state
*
* @dev: cpuidle device
* @drv: cpuidle driver
* @idx: state index
*
* Called from the CPUidle framework to program the device to the
* specified target state selected by the governor.
*/
static int arm_enter_idle_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
int ret = 0;
struct timeval start_time, end_time;
long usec_elapsed;
do_gettimeofday(&start_time);
cpuidle_count++;
if (idx > idx_max) {
idx = idx_max;
}
switch (idx) {
case STANDBY:
cpu_do_idle();
break;
case L_SLEEP:
light_sleep_en();
cpu_do_idle();
light_sleep_dis();
break;
case CORE_PD:
light_sleep_en();
cpu_pm_enter();
ret = cpu_suspend(idx);
cpu_pm_exit();
light_sleep_dis();
break;
case CLUSTER_PD:
light_sleep_en();
cpu_pm_enter();
#ifndef CONFIG_ARCH_SCX35LT8
cpu_cluster_pm_enter();
#endif
ret = cpu_suspend(idx);
#ifndef CONFIG_ARCH_SCX35LT8
cpu_cluster_pm_exit();
#endif
cpu_pm_exit();
light_sleep_dis();
break;
case TOP_PD:
light_sleep_en();
cpu_pm_enter();
if (just_core_0_power_on()) {
cpu_cluster_pm_enter();
ret = cpu_suspend(idx);
cpu_cluster_pm_exit();
} else
ret = cpu_suspend(--idx);
cpu_pm_exit();
light_sleep_dis();
break;
default:
cpu_do_idle();
WARN(1, "[CPUIDLE]: NO THIS IDLE LEVEL!!!");
}
if (cpuidle_count % 5000 == 0) {
do_gettimeofday(&end_time);
usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
(end_time.tv_usec - start_time.tv_usec);
pr_info("[CPUIDLE] Enter idle state: %d ,usec_elapsed = %ld \n",
idx, usec_elapsed);
}
if (cpuidle_debug) {
do_gettimeofday(&end_time);
usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
(end_time.tv_usec - start_time.tv_usec);
pr_info("[CPUIDLE] Enter idle state: %d ,usec_elapsed = %ld \n",
idx, usec_elapsed);
if (cpuidle_count % 500 == 0) {
cpuidle_debug = 0;
}
}
return ret ? -1 : idx;
}
struct cpuidle_driver arm64_idle_driver = {
.name = "arm64_idle_sprd",
.owner = THIS_MODULE,
};
static struct device_node *state_nodes[CPUIDLE_STATE_MAX] __initdata;
/*
* arm64_idle_sprd_init
*
* Registers the arm64 specific cpuidle driver with the cpuidle
* framework. It relies on core code to parse the idle states
* and initialize them using driver data structures accordingly.
*/
int __init arm64_idle_sprd_init(void)
{
int i, ret;
const char *entry_method;
struct device_node *idle_states_node;
const struct cpu_suspend_ops *suspend_init;
struct cpuidle_driver *drv = &arm64_idle_driver;
idle_states_node = of_find_node_by_path("/cpus/idle-states");
if (!idle_states_node) {
return -ENOENT;
}
if (of_property_read_string(idle_states_node, "entry-method",
&entry_method)) {
pr_warn(" * %s missing entry-method property\n",
idle_states_node->full_name);
of_node_put(idle_states_node);
return -EOPNOTSUPP;
}
/*
* State at index 0 is standby wfi and considered standard
* on all ARM platforms. If in some platforms simple wfi
* can't be used as "state 0", DT bindings must be implemented
* to work around this issue and allow installing a special
* handler for idle state index 0.
*/
drv->states[0].exit_latency = 1;
drv->states[0].target_residency = 1;
#ifdef CONFIG_ARCH_SCX35LT8
drv->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
#else
drv->states[0].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TIMER_STOP;
#endif
strncpy(drv->states[0].name, "ARM WFI", CPUIDLE_NAME_LEN);
strncpy(drv->states[0].desc, "ARM WFI", CPUIDLE_DESC_LEN);
drv->cpumask = (struct cpumask *) cpu_possible_mask;
/*
* Start at index 1, request idle state nodes to be filled
*/
ret = of_init_idle_driver(drv, state_nodes, 1, true);
if (ret) {
return ret;
}
for (i = 0; i < drv->state_count; i++)
drv->states[i].enter = arm_enter_idle_state;
printk("[CPUIDLE]<arm64_idle_sprd_init> init OK. \n");
return cpuidle_register(drv, NULL);
}
device_initcall(arm64_idle_sprd_init);
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