arch/arm/mach-msm/msm-pm.c

/* Copyright (c) 2010-2013, 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/debugfs.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/ktime.h>
#include <linux/smp.h>
#include <linux/tick.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/cpu_pm.h>
#include <asm/uaccess.h>
#include <asm/suspend.h>
#include <asm/cacheflush.h>
#include <asm/outercache.h>
#include <mach/scm.h>
#include <mach/msm_bus.h>
#include <mach/jtag.h>
#include "acpuclock.h"
#include "avs.h"
#include "idle.h"
#include "pm.h"
#include "scm-boot.h"
#include "spm.h"
#include "pm-boot.h"

#define CREATE_TRACE_POINTS
#include <mach/trace_msm_low_power.h>

#define SCM_CMD_TERMINATE_PC	(0x2)
#define SCM_CMD_CORE_HOTPLUGGED (0x10)

#define GET_CPU_OF_ATTR(attr) \
	(container_of(attr, struct msm_pm_kobj_attribute, ka)->cpu)

#define SCLK_HZ (32768)

#define MAX_BUF_SIZE  512

static int msm_pm_debug_mask = 1;
module_param_named(
	debug_mask, msm_pm_debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP
);

static bool use_acpuclk_apis;

enum {
	MSM_PM_DEBUG_SUSPEND = BIT(0),
	MSM_PM_DEBUG_POWER_COLLAPSE = BIT(1),
	MSM_PM_DEBUG_SUSPEND_LIMITS = BIT(2),
	MSM_PM_DEBUG_CLOCK = BIT(3),
	MSM_PM_DEBUG_RESET_VECTOR = BIT(4),
	MSM_PM_DEBUG_IDLE_CLK = BIT(5),
	MSM_PM_DEBUG_IDLE = BIT(6),
	MSM_PM_DEBUG_IDLE_LIMITS = BIT(7),
	MSM_PM_DEBUG_HOTPLUG = BIT(8),
};

enum msm_pc_count_offsets {
	MSM_PC_ENTRY_COUNTER,
	MSM_PC_EXIT_COUNTER,
	MSM_PC_FALLTHRU_COUNTER,
	MSM_PC_NUM_COUNTERS,
};

enum {
	MSM_PM_MODE_ATTR_SUSPEND,
	MSM_PM_MODE_ATTR_IDLE,
	MSM_PM_MODE_ATTR_NR,
};

static char *msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_NR] = {
	[MSM_PM_MODE_ATTR_SUSPEND] = "suspend_enabled",
	[MSM_PM_MODE_ATTR_IDLE] = "idle_enabled",
};

struct msm_pm_kobj_attribute {
	unsigned int cpu;
	struct kobj_attribute ka;
};

struct msm_pm_sysfs_sleep_mode {
	struct kobject *kobj;
	struct attribute_group attr_group;
	struct attribute *attrs[MSM_PM_MODE_ATTR_NR + 1];
	struct msm_pm_kobj_attribute kas[MSM_PM_MODE_ATTR_NR];
};

static char *msm_pm_sleep_mode_labels[MSM_PM_SLEEP_MODE_NR] = {
	[MSM_PM_SLEEP_MODE_POWER_COLLAPSE] = "power_collapse",
	[MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT] = "wfi",
	[MSM_PM_SLEEP_MODE_RETENTION] = "retention",
	[MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE] =
		"standalone_power_collapse",
};

static bool msm_pm_ldo_retention_enabled = true;
static bool msm_no_ramp_down_pc;
static struct msm_pm_sleep_status_data *msm_pm_slp_sts;
DEFINE_PER_CPU(struct clk *, cpu_clks);
static struct clk *l2_clk;

static void (*msm_pm_disable_l2_fn)(void);
static void (*msm_pm_enable_l2_fn)(void);
static void (*msm_pm_flush_l2_fn)(void);
static void __iomem *msm_pc_debug_counters;

/*
 * Default the l2 flush flag to OFF so the caches are flushed during power
 * collapse unless the explicitly voted by lpm driver.
 */
static enum msm_pm_l2_scm_flag msm_pm_flush_l2_flag = MSM_SCM_L2_OFF;

void msm_pm_set_l2_flush_flag(enum msm_pm_l2_scm_flag flag)
{
	msm_pm_flush_l2_flag = flag;
}
EXPORT_SYMBOL(msm_pm_set_l2_flush_flag);

static enum msm_pm_l2_scm_flag msm_pm_get_l2_flush_flag(void)
{
	return msm_pm_flush_l2_flag;
}

static cpumask_t retention_cpus;
static DEFINE_SPINLOCK(retention_lock);

static int msm_pm_get_pc_mode(struct device_node *node,
		const char *key, uint32_t *pc_mode_val)
{
	struct pc_mode_of {
		uint32_t mode;
		char *mode_name;
	};
	int i;
	struct pc_mode_of pc_modes[] = {
				{MSM_PM_PC_TZ_L2_INT, "tz_l2_int"},
				{MSM_PM_PC_NOTZ_L2_EXT, "no_tz_l2_ext"},
				{MSM_PM_PC_TZ_L2_EXT , "tz_l2_ext"} };
	int ret;
	const char *pc_mode_str;
	*pc_mode_val = MSM_PM_PC_TZ_L2_INT;

	ret = of_property_read_string(node, key, &pc_mode_str);
	if (!ret) {
		ret = -EINVAL;
		for (i = 0; i < ARRAY_SIZE(pc_modes); i++) {
			if (!strncmp(pc_mode_str, pc_modes[i].mode_name,
				strlen(pc_modes[i].mode_name))) {
				*pc_mode_val = pc_modes[i].mode;
				ret = 0;
				break;
			}
		}
	} else {
		pr_debug("%s: Cannot read %s,defaulting to 0", __func__, key);
		ret = 0;
	}
	return ret;
}

/*
 * Write out the attribute.
 */
static ssize_t msm_pm_mode_attr_show(
	struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
	int ret = -EINVAL;
	int i;

	for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
		struct kernel_param kp;
		unsigned int cpu;
		struct msm_pm_platform_data *mode;

		if (msm_pm_sleep_mode_labels[i] == NULL)
			continue;

		if (strcmp(kobj->name, msm_pm_sleep_mode_labels[i]))
			continue;

		cpu = GET_CPU_OF_ATTR(attr);
		mode = &msm_pm_sleep_modes[MSM_PM_MODE(cpu, i)];

		if (!strcmp(attr->attr.name,
			msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_SUSPEND])) {
			u32 arg = mode->suspend_enabled;
			kp.arg = &arg;
			ret = param_get_ulong(buf, &kp);
		} else if (!strcmp(attr->attr.name,
			msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_IDLE])) {
			u32 arg = mode->idle_enabled;
			kp.arg = &arg;
			ret = param_get_ulong(buf, &kp);
		}

		break;
	}

	if (ret > 0) {
		strlcat(buf, "\n", PAGE_SIZE);
		ret++;
	}

	return ret;
}

static ssize_t msm_pm_mode_attr_store(struct kobject *kobj,
	struct kobj_attribute *attr, const char *buf, size_t count)
{
	int ret = -EINVAL;
	int i;

	for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
		struct kernel_param kp;
		unsigned int cpu;
		struct msm_pm_platform_data *mode;

		if (msm_pm_sleep_mode_labels[i] == NULL)
			continue;

		if (strcmp(kobj->name, msm_pm_sleep_mode_labels[i]))
			continue;

		cpu = GET_CPU_OF_ATTR(attr);
		mode = &msm_pm_sleep_modes[MSM_PM_MODE(cpu, i)];

		if (!strcmp(attr->attr.name,
			msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_SUSPEND])) {
			kp.arg = &mode->suspend_enabled;
			ret = param_set_byte(buf, &kp);
		} else if (!strcmp(attr->attr.name,
			msm_pm_mode_attr_labels[MSM_PM_MODE_ATTR_IDLE])) {
			kp.arg = &mode->idle_enabled;
			ret = param_set_byte(buf, &kp);
		}

		break;
	}

	return ret ? ret : count;
}

static int msm_pm_mode_sysfs_add_cpu(
	unsigned int cpu, struct kobject *modes_kobj)
{
	char cpu_name[8];
	struct kobject *cpu_kobj;
	struct msm_pm_sysfs_sleep_mode *mode = NULL;
	int i, j, k;
	int ret;

	snprintf(cpu_name, sizeof(cpu_name), "cpu%u", cpu);
	cpu_kobj = kobject_create_and_add(cpu_name, modes_kobj);
	if (!cpu_kobj) {
		pr_err("%s: cannot create %s kobject\n", __func__, cpu_name);
		ret = -ENOMEM;
		goto mode_sysfs_add_cpu_exit;
	}

	for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
		int idx = MSM_PM_MODE(cpu, i);

		if ((!msm_pm_sleep_modes[idx].suspend_supported)
			&& (!msm_pm_sleep_modes[idx].idle_supported))
			continue;

		if (!msm_pm_sleep_mode_labels[i] ||
				!msm_pm_sleep_mode_labels[i][0])
			continue;

		mode = kzalloc(sizeof(*mode), GFP_KERNEL);
		if (!mode) {
			pr_err("%s: cannot allocate memory for attributes\n",
				__func__);
			ret = -ENOMEM;
			goto mode_sysfs_add_cpu_exit;
		}

		mode->kobj = kobject_create_and_add(
				msm_pm_sleep_mode_labels[i], cpu_kobj);
		if (!mode->kobj) {
			pr_err("%s: cannot create kobject\n", __func__);
			ret = -ENOMEM;
			goto mode_sysfs_add_cpu_exit;
		}

		for (k = 0, j = 0; k < MSM_PM_MODE_ATTR_NR; k++) {
			if ((k == MSM_PM_MODE_ATTR_IDLE) &&
				!msm_pm_sleep_modes[idx].idle_supported)
				continue;
			if ((k == MSM_PM_MODE_ATTR_SUSPEND) &&
			     !msm_pm_sleep_modes[idx].suspend_supported)
				continue;
			sysfs_attr_init(&mode->kas[j].ka.attr);
			mode->kas[j].cpu = cpu;
			mode->kas[j].ka.attr.mode = 0644;
			mode->kas[j].ka.show = msm_pm_mode_attr_show;
			mode->kas[j].ka.store = msm_pm_mode_attr_store;
			mode->kas[j].ka.attr.name = msm_pm_mode_attr_labels[k];
			mode->attrs[j] = &mode->kas[j].ka.attr;
			j++;
		}
		mode->attrs[j] = NULL;

		mode->attr_group.attrs = mode->attrs;
		ret = sysfs_create_group(mode->kobj, &mode->attr_group);
		if (ret) {
			pr_err("%s: cannot create kobject attribute group\n",
				__func__);
			goto mode_sysfs_add_cpu_exit;
		}
	}

	ret = 0;

mode_sysfs_add_cpu_exit:
	if (ret) {
		if (mode && mode->kobj)
			kobject_del(mode->kobj);
		kfree(mode);
	}

	return ret;
}

int msm_pm_mode_sysfs_add(void)
{
	struct kobject *module_kobj;
	struct kobject *modes_kobj;
	unsigned int cpu;
	int ret;

	module_kobj = kset_find_obj(module_kset, KBUILD_MODNAME);
	if (!module_kobj) {
		pr_err("%s: cannot find kobject for module %s\n",
			__func__, KBUILD_MODNAME);
		ret = -ENOENT;
		goto mode_sysfs_add_exit;
	}

	modes_kobj = kobject_create_and_add("modes", module_kobj);
	if (!modes_kobj) {
		pr_err("%s: cannot create modes kobject\n", __func__);
		ret = -ENOMEM;
		goto mode_sysfs_add_exit;
	}

	for_each_possible_cpu(cpu) {
		ret = msm_pm_mode_sysfs_add_cpu(cpu, modes_kobj);
		if (ret)
			goto mode_sysfs_add_exit;
	}

	ret = 0;

mode_sysfs_add_exit:
	return ret;
}

static inline void msm_arch_idle(void)
{
	mb();
	wfi();
}

static bool msm_pm_is_L1_writeback(void)
{
	u32 sel = 0, cache_id;

	asm volatile ("mcr p15, 2, %[ccselr], c0, c0, 0\n\t"
		      "isb\n\t"
		      "mrc p15, 1, %[ccsidr], c0, c0, 0\n\t"
		      :[ccsidr]"=r" (cache_id)
		      :[ccselr]"r" (sel)
		     );
	return cache_id & BIT(31);
}

static enum msm_pm_time_stats_id msm_pm_swfi(bool from_idle)
{
	msm_arch_idle();
	return MSM_PM_STAT_IDLE_WFI;
}

static enum msm_pm_time_stats_id msm_pm_retention(bool from_idle)
{
	int ret = 0;
	int cpu = smp_processor_id();
	int saved_rate = 0;
	struct clk *cpu_clk = per_cpu(cpu_clks, cpu);

	spin_lock(&retention_lock);

	if (!msm_pm_ldo_retention_enabled)
		goto bailout;

	cpumask_set_cpu(cpu, &retention_cpus);
	spin_unlock(&retention_lock);

	if (use_acpuclk_apis)
		saved_rate = acpuclk_power_collapse();
	else
		clk_disable(cpu_clk);

	ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_POWER_RETENTION, false);
	WARN_ON(ret);

	msm_arch_idle();

	if (use_acpuclk_apis) {
		if (acpuclk_set_rate(cpu, saved_rate, SETRATE_PC))
			pr_err("%s(): Error setting acpuclk_set_rate\n",
					__func__);
	} else {
		if (clk_enable(cpu_clk))
			pr_err("%s(): Error restoring cpu clk\n", __func__);
	}

	spin_lock(&retention_lock);
	cpumask_clear_cpu(cpu, &retention_cpus);
bailout:
	spin_unlock(&retention_lock);

	ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false);
	WARN_ON(ret);

	return MSM_PM_STAT_RETENTION;
}

static inline void msm_pc_inc_debug_count(uint32_t cpu,
		enum msm_pc_count_offsets offset)
{
	uint32_t cnt;

	if (!msm_pc_debug_counters)
		return;

	cnt = readl_relaxed(msm_pc_debug_counters + cpu * 4 + offset * 4);
	writel_relaxed(++cnt, msm_pc_debug_counters + cpu * 4 + offset * 4);
	mb();
}

static bool msm_pm_pc_hotplug(void)
{
	uint32_t cpu = smp_processor_id();

	if (msm_pm_is_L1_writeback())
		flush_cache_louis();

	msm_pc_inc_debug_count(cpu, MSM_PC_ENTRY_COUNTER);

	scm_call_atomic1(SCM_SVC_BOOT, SCM_CMD_TERMINATE_PC,
			SCM_CMD_CORE_HOTPLUGGED);

	/* Should not return here */
	msm_pc_inc_debug_count(cpu, MSM_PC_FALLTHRU_COUNTER);
	return 0;
}

static int msm_pm_collapse(unsigned long unused)
{
	uint32_t cpu = smp_processor_id();

	if (msm_pm_get_l2_flush_flag() == MSM_SCM_L2_OFF) {
		flush_cache_all();
		if (msm_pm_flush_l2_fn)
			msm_pm_flush_l2_fn();
	} else if (msm_pm_is_L1_writeback())
		flush_cache_louis();

	if (msm_pm_disable_l2_fn)
		msm_pm_disable_l2_fn();

	msm_pc_inc_debug_count(cpu, MSM_PC_ENTRY_COUNTER);

	scm_call_atomic1(SCM_SVC_BOOT, SCM_CMD_TERMINATE_PC,
				msm_pm_get_l2_flush_flag());

	msm_pc_inc_debug_count(cpu, MSM_PC_FALLTHRU_COUNTER);

	if (msm_pm_enable_l2_fn)
		msm_pm_enable_l2_fn();

	return 0;
}

static bool __ref msm_pm_spm_power_collapse(
	unsigned int cpu, bool from_idle, bool notify_rpm)
{
	void *entry;
	bool collapsed = 0;
	int ret;
	bool save_cpu_regs = !cpu || from_idle;

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: notify_rpm %d\n",
			cpu, __func__, (int) notify_rpm);

	if (from_idle)
		cpu_pm_enter();

	ret = msm_spm_set_low_power_mode(
			MSM_SPM_MODE_POWER_COLLAPSE, notify_rpm);
	WARN_ON(ret);

	entry = save_cpu_regs ?  cpu_resume : msm_secondary_startup;

	msm_pm_boot_config_before_pc(cpu, virt_to_phys(entry));

	if (MSM_PM_DEBUG_RESET_VECTOR & msm_pm_debug_mask)
		pr_info("CPU%u: %s: program vector to %p\n",
			cpu, __func__, entry);

	msm_jtag_save_state();

	collapsed = save_cpu_regs ?
		!cpu_suspend(0, msm_pm_collapse) : msm_pm_pc_hotplug();

	msm_jtag_restore_state();

	if (collapsed) {
		cpu_init();
		local_fiq_enable();
	}

	msm_pm_boot_config_after_pc(cpu);

	if (from_idle)
		cpu_pm_exit();

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: msm_pm_collapse returned, collapsed %d\n",
			cpu, __func__, collapsed);

	ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false);
	WARN_ON(ret);
	return collapsed;
}

static enum msm_pm_time_stats_id msm_pm_power_collapse_standalone(
		bool from_idle)
{
	unsigned int cpu = smp_processor_id();
	unsigned int avsdscr;
	unsigned int avscsr;
	bool collapsed;

	avsdscr = avs_get_avsdscr();
	avscsr = avs_get_avscsr();
	avs_set_avscsr(0); /* Disable AVS */

	collapsed = msm_pm_spm_power_collapse(cpu, from_idle, false);

	avs_set_avsdscr(avsdscr);
	avs_set_avscsr(avscsr);
	return collapsed ? MSM_PM_STAT_IDLE_STANDALONE_POWER_COLLAPSE :
			MSM_PM_STAT_IDLE_FAILED_STANDALONE_POWER_COLLAPSE;
}

static int ramp_down_last_cpu(int cpu)
{
	struct clk *cpu_clk = per_cpu(cpu_clks, cpu);
	int ret = 0;

	if (use_acpuclk_apis) {
		ret = acpuclk_power_collapse();
		if (MSM_PM_DEBUG_CLOCK & msm_pm_debug_mask)
			pr_info("CPU%u: %s: change clk rate(old rate = %d)\n",
					cpu, __func__, ret);
	} else {
		clk_disable(cpu_clk);
		clk_disable(l2_clk);
	}
	return ret;
}

static int ramp_up_first_cpu(int cpu, int saved_rate)
{
	struct clk *cpu_clk = per_cpu(cpu_clks, cpu);
	int rc = 0;

	if (MSM_PM_DEBUG_CLOCK & msm_pm_debug_mask)
		pr_info("CPU%u: %s: restore clock rate\n",
				cpu, __func__);

	if (use_acpuclk_apis) {
		rc = acpuclk_set_rate(cpu, saved_rate, SETRATE_PC);
		if (rc)
			pr_err("CPU:%u: Error restoring cpu clk\n", cpu);
	} else {
		if (l2_clk) {
			rc = clk_enable(l2_clk);
			if (rc)
				pr_err("%s(): Error restoring l2 clk\n",
						__func__);
		}

		if (cpu_clk) {
			int ret = clk_enable(cpu_clk);

			if (ret) {
				pr_err("%s(): Error restoring cpu clk\n",
						__func__);
				return ret;
			}
		}
	}

	return rc;
}

static enum msm_pm_time_stats_id msm_pm_power_collapse(bool from_idle)
{
	unsigned int cpu = smp_processor_id();
	unsigned long saved_acpuclk_rate = 0;
	unsigned int avsdscr;
	unsigned int avscsr;
	bool collapsed;

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: idle %d\n",
			cpu, __func__, (int)from_idle);

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: pre power down\n", cpu, __func__);

	avsdscr = avs_get_avsdscr();
	avscsr = avs_get_avscsr();
	avs_set_avscsr(0); /* Disable AVS */

	if (cpu_online(cpu) && !msm_no_ramp_down_pc)
		saved_acpuclk_rate = ramp_down_last_cpu(cpu);

	collapsed = msm_pm_spm_power_collapse(cpu, from_idle, true);

	if (cpu_online(cpu) && !msm_no_ramp_down_pc)
		ramp_up_first_cpu(cpu, saved_acpuclk_rate);

	avs_set_avsdscr(avsdscr);
	avs_set_avscsr(avscsr);

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: post power up\n", cpu, __func__);

	if (MSM_PM_DEBUG_POWER_COLLAPSE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: return\n", cpu, __func__);
	return collapsed ? MSM_PM_STAT_IDLE_POWER_COLLAPSE :
			MSM_PM_STAT_IDLE_FAILED_POWER_COLLAPSE;
}
/******************************************************************************
 * External Idle/Suspend Functions
 *****************************************************************************/

void arch_idle(void)
{
	return;
}

static inline void msm_pm_ftrace_lpm_enter(unsigned int cpu,
		uint32_t latency, uint32_t sleep_us,
		uint32_t wake_up,
		enum msm_pm_sleep_mode mode)
{
	switch (mode) {
	case MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT:
		trace_msm_pm_enter_wfi(cpu, latency, sleep_us, wake_up);
		break;
	case MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE:
		trace_msm_pm_enter_spc(cpu, latency, sleep_us, wake_up);
		break;
	case MSM_PM_SLEEP_MODE_POWER_COLLAPSE:
		trace_msm_pm_enter_pc(cpu, latency, sleep_us, wake_up);
		break;
	case MSM_PM_SLEEP_MODE_RETENTION:
		trace_msm_pm_enter_ret(cpu, latency, sleep_us, wake_up);
		break;
	default:
		break;
	}
}

static inline void msm_pm_ftrace_lpm_exit(unsigned int cpu,
		enum msm_pm_sleep_mode mode,
		bool success)
{
	switch (mode) {
	case MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT:
		trace_msm_pm_exit_wfi(cpu, success);
		break;
	case MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE:
		trace_msm_pm_exit_spc(cpu, success);
		break;
	case MSM_PM_SLEEP_MODE_POWER_COLLAPSE:
		trace_msm_pm_exit_pc(cpu, success);
		break;
	case MSM_PM_SLEEP_MODE_RETENTION:
		trace_msm_pm_exit_ret(cpu, success);
		break;
	default:
		break;
	}
}

static enum msm_pm_time_stats_id (*execute[MSM_PM_SLEEP_MODE_NR])(bool idle) = {
	[MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT] = msm_pm_swfi,
	[MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE] =
		msm_pm_power_collapse_standalone,
	[MSM_PM_SLEEP_MODE_RETENTION] = msm_pm_retention,
	[MSM_PM_SLEEP_MODE_POWER_COLLAPSE] = msm_pm_power_collapse,
};

bool msm_cpu_pm_check_mode(unsigned int cpu, enum msm_pm_sleep_mode mode,
		bool from_idle)
{
	int idx = MSM_PM_MODE(cpu, mode);
	struct msm_pm_platform_data *d = &msm_pm_sleep_modes[idx];

	if ((mode == MSM_PM_SLEEP_MODE_RETENTION)
			&& !msm_pm_ldo_retention_enabled)
		return false;

	if (from_idle)
		return d->idle_enabled && d->idle_supported;
	else
		return d->suspend_enabled && d->suspend_supported;
}

int msm_cpu_pm_enter_sleep(enum msm_pm_sleep_mode mode, bool from_idle)
{
	int64_t time;
	bool collapsed = 1;
	int exit_stat = -1;

	if (MSM_PM_DEBUG_IDLE & msm_pm_debug_mask)
		pr_info("CPU%u: %s: mode %d\n",
			smp_processor_id(), __func__, mode);
	if (!from_idle)
		pr_info("CPU%u: %s mode:%d\n",
			smp_processor_id(), __func__, mode);

	time = sched_clock();
	if (execute[mode])
		exit_stat = execute[mode](from_idle);
	time = sched_clock() - time;
	if (from_idle)
		msm_pm_ftrace_lpm_exit(smp_processor_id(), mode, collapsed);
	else
		exit_stat = MSM_PM_STAT_SUSPEND;
	if (exit_stat >= 0)
		msm_pm_add_stat(exit_stat, time);
	do_div(time, 1000);
	return collapsed;
}

int msm_pm_wait_cpu_shutdown(unsigned int cpu)
{
	int timeout = 10;

	if (!msm_pm_slp_sts)
		return 0;
	if (!msm_pm_slp_sts[cpu].base_addr)
		return 0;
	while (timeout--) {
		/*
		 * Check for the SPM of the core being hotplugged to set
		 * its sleep state.The SPM sleep state indicates that the
		 * core has been power collapsed.
		 */
		int acc_sts = __raw_readl(msm_pm_slp_sts[cpu].base_addr);

		if (acc_sts & msm_pm_slp_sts[cpu].mask)
			return 0;
		udelay(100);
	}

	pr_info("%s(): Timed out waiting for CPU %u SPM to enter sleep state",
		__func__, cpu);
	return -EBUSY;
}

void msm_pm_cpu_enter_lowpower(unsigned int cpu)
{
	int i;
	bool allow[MSM_PM_SLEEP_MODE_NR];

	for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {
		struct msm_pm_platform_data *mode;

		mode = &msm_pm_sleep_modes[MSM_PM_MODE(cpu, i)];
		allow[i] = mode->suspend_supported && mode->suspend_enabled;
	}

	if (MSM_PM_DEBUG_HOTPLUG & msm_pm_debug_mask)
		pr_notice("CPU%u: %s: shutting down cpu\n", cpu, __func__);

	if (allow[MSM_PM_SLEEP_MODE_POWER_COLLAPSE])
		msm_pm_power_collapse(false);
	else if (allow[MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE])
		msm_pm_power_collapse_standalone(false);
	else if (allow[MSM_PM_SLEEP_MODE_RETENTION])
		msm_pm_retention(false);
	else
		msm_pm_swfi(false);
}

static void msm_pm_ack_retention_disable(void *data)
{
	/*
	 * This is a NULL function to ensure that the core has woken up
	 * and is safe to disable retention.
	 */
}
/**
 * msm_pm_enable_retention() - Disable/Enable retention on all cores
 * @enable: Enable/Disable retention
 *
 */
void msm_pm_enable_retention(bool enable)
{
	if (enable == msm_pm_ldo_retention_enabled)
		return;

	msm_pm_ldo_retention_enabled = enable;

	/*
	 * If retention is being disabled, wakeup all online core to ensure
	 * that it isn't executing retention. Offlined cores need not be woken
	 * up as they enter the deepest sleep mode, namely RPM assited power
	 * collapse
	 */
	if (!enable) {
		preempt_disable();
		smp_call_function_many(&retention_cpus,
				msm_pm_ack_retention_disable,
				NULL, true);
		preempt_enable();
	}
}
EXPORT_SYMBOL(msm_pm_enable_retention);

static int msm_pm_snoc_client_probe(struct platform_device *pdev)
{
	int rc = 0;
	static struct msm_bus_scale_pdata *msm_pm_bus_pdata;
	static uint32_t msm_pm_bus_client;

	msm_pm_bus_pdata = msm_bus_cl_get_pdata(pdev);

	if (msm_pm_bus_pdata) {
		msm_pm_bus_client =
			msm_bus_scale_register_client(msm_pm_bus_pdata);

		if (!msm_pm_bus_client) {
			pr_err("%s: Failed to register SNOC client", __func__);
			rc = -ENXIO;
			goto snoc_cl_probe_done;
		}

		rc = msm_bus_scale_client_update_request(msm_pm_bus_client, 1);

		if (rc)
			pr_err("%s: Error setting bus rate", __func__);
	}

snoc_cl_probe_done:
	return rc;
}

static int msm_cpu_status_probe(struct platform_device *pdev)
{
	struct msm_pm_sleep_status_data *pdata;
	char *key;
	u32 cpu;

	if (!pdev)
		return -EFAULT;

	msm_pm_slp_sts = devm_kzalloc(&pdev->dev,
			sizeof(*msm_pm_slp_sts) * num_possible_cpus(),
			GFP_KERNEL);

	if (!msm_pm_slp_sts)
		return -ENOMEM;

	if (pdev->dev.of_node) {
		struct resource *res;
		u32 offset;
		int rc;
		u32 mask;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res)
			return -ENODEV;

		key = "qcom,cpu-alias-addr";
		rc = of_property_read_u32(pdev->dev.of_node, key, &offset);

		if (rc)
			return -ENODEV;

		key = "qcom,sleep-status-mask";
		rc = of_property_read_u32(pdev->dev.of_node, key, &mask);

		if (rc)
			return -ENODEV;

		for_each_possible_cpu(cpu) {
			phys_addr_t base_c = res->start + cpu * offset;
			msm_pm_slp_sts[cpu].base_addr =
				devm_ioremap(&pdev->dev, base_c,
						resource_size(res));
			msm_pm_slp_sts[cpu].mask = mask;

			if (!msm_pm_slp_sts[cpu].base_addr)
				return -ENOMEM;
		}
	} else {
		pdata = pdev->dev.platform_data;
		if (!pdev->dev.platform_data)
			return -EINVAL;

		for_each_possible_cpu(cpu) {
			msm_pm_slp_sts[cpu].base_addr =
				pdata->base_addr + cpu * pdata->cpu_offset;
			msm_pm_slp_sts[cpu].mask = pdata->mask;
		}
	}

	return 0;
};

static struct of_device_id msm_slp_sts_match_tbl[] = {
	{.compatible = "qcom,cpu-sleep-status"},
	{},
};

static struct platform_driver msm_cpu_status_driver = {
	.probe = msm_cpu_status_probe,
	.driver = {
		.name = "cpu_slp_status",
		.owner = THIS_MODULE,
		.of_match_table = msm_slp_sts_match_tbl,
	},
};

static struct of_device_id msm_snoc_clnt_match_tbl[] = {
	{.compatible = "qcom,pm-snoc-client"},
	{},
};

static struct platform_driver msm_cpu_pm_snoc_client_driver = {
	.probe = msm_pm_snoc_client_probe,
	.driver = {
		.name = "pm_snoc_client",
		.owner = THIS_MODULE,
		.of_match_table = msm_snoc_clnt_match_tbl,
	},
};

static int msm_pm_init(void)
{
	enum msm_pm_time_stats_id enable_stats[] = {
		MSM_PM_STAT_IDLE_WFI,
		MSM_PM_STAT_RETENTION,
		MSM_PM_STAT_IDLE_STANDALONE_POWER_COLLAPSE,
		MSM_PM_STAT_IDLE_FAILED_STANDALONE_POWER_COLLAPSE,
		MSM_PM_STAT_IDLE_POWER_COLLAPSE,
		MSM_PM_STAT_IDLE_FAILED_POWER_COLLAPSE,
		MSM_PM_STAT_SUSPEND,
	};
	msm_pm_mode_sysfs_add();
	msm_pm_add_stats(enable_stats, ARRAY_SIZE(enable_stats));

	return 0;
}

static void msm_pm_set_flush_fn(uint32_t pc_mode)
{
	msm_pm_disable_l2_fn = NULL;
	msm_pm_enable_l2_fn = NULL;
	msm_pm_flush_l2_fn = outer_flush_all;

	if (pc_mode == MSM_PM_PC_NOTZ_L2_EXT) {
		msm_pm_disable_l2_fn = outer_disable;
		msm_pm_enable_l2_fn = outer_resume;
	}
}

struct msm_pc_debug_counters_buffer {
	void __iomem *reg;
	u32 len;
	char buf[MAX_BUF_SIZE];
};

static inline u32 msm_pc_debug_counters_read_register(
		void __iomem *reg, int index , int offset)
{
	return readl_relaxed(reg + (index * 4 + offset) * 4);
}

static char *counter_name[] = {
		"PC Entry Counter",
		"Warmboot Entry Counter",
		"PC Bailout Counter"
};

static int msm_pc_debug_counters_copy(
		struct msm_pc_debug_counters_buffer *data)
{
	int j;
	u32 stat;
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		data->len += scnprintf(data->buf + data->len,
				sizeof(data->buf)-data->len,
				"CPU%d\n", cpu);

		for (j = 0; j < MSM_PC_NUM_COUNTERS; j++) {
			stat = msm_pc_debug_counters_read_register(
					data->reg, cpu, j);
			data->len += scnprintf(data->buf + data->len,
					sizeof(data->buf)-data->len,
					"\t%s : %d\n", counter_name[j],
					stat);
		}

	}

	return data->len;
}

static int msm_pc_debug_counters_file_read(struct file *file,
		char __user *bufu, size_t count, loff_t *ppos)
{
	struct msm_pc_debug_counters_buffer *data;

	data = file->private_data;

	if (!data)
		return -EINVAL;

	if (!bufu || count < 0)
		return -EINVAL;

	if (!access_ok(VERIFY_WRITE, bufu, count))
		return -EFAULT;

	if (*ppos >= data->len && data->len == 0)
		data->len = msm_pc_debug_counters_copy(data);

	return simple_read_from_buffer(bufu, count, ppos,
			data->buf, data->len);
}

static int msm_pc_debug_counters_file_open(struct inode *inode,
		struct file *file)
{
	struct msm_pc_debug_counters_buffer *buf;
	void __iomem *msm_pc_debug_counters_reg;

	msm_pc_debug_counters_reg = inode->i_private;

	if (!msm_pc_debug_counters_reg)
		return -EINVAL;

	file->private_data = kzalloc(
		sizeof(struct msm_pc_debug_counters_buffer), GFP_KERNEL);

	if (!file->private_data) {
		pr_err("%s: ERROR kmalloc failed to allocate %d bytes\n",
		__func__, sizeof(struct msm_pc_debug_counters_buffer));

		return -ENOMEM;
	}

	buf = file->private_data;
	buf->reg = msm_pc_debug_counters_reg;

	return 0;
}

static int msm_pc_debug_counters_file_close(struct inode *inode,
		struct file *file)
{
	kfree(file->private_data);
	return 0;
}

static const struct file_operations msm_pc_debug_counters_fops = {
	.open = msm_pc_debug_counters_file_open,
	.read = msm_pc_debug_counters_file_read,
	.release = msm_pc_debug_counters_file_close,
	.llseek = no_llseek,
};

static int msm_pm_clk_init(struct platform_device *pdev)
{
	bool synced_clocks;
	u32 cpu;
	char clk_name[] = "cpu??_clk";
	bool cpu_as_clocks;
	char *key;

	key = "qcom,cpus-as-clocks";
	cpu_as_clocks = of_property_read_bool(pdev->dev.of_node, key);

	if (!cpu_as_clocks) {
		use_acpuclk_apis = true;
		return 0;
	}

	key = "qcom,synced-clocks";
	synced_clocks = of_property_read_bool(pdev->dev.of_node, key);

	for_each_possible_cpu(cpu) {
		struct clk *clk;
		snprintf(clk_name, sizeof(clk_name), "cpu%d_clk", cpu);
		clk = devm_clk_get(&pdev->dev, clk_name);
		if (IS_ERR(clk)) {
			if (cpu && synced_clocks)
				return 0;
			else
				return PTR_ERR(clk);
		}
		per_cpu(cpu_clks, cpu) = clk;
	}

	if (synced_clocks)
		return 0;

	l2_clk = devm_clk_get(&pdev->dev, "l2_clk");

	return PTR_RET(l2_clk);
}

static int msm_cpu_pm_probe(struct platform_device *pdev)
{
	char *key = NULL;
	struct dentry *dent = NULL;
	struct resource *res = NULL;
	int i;
	struct msm_pm_init_data_type pdata_local;
	int ret = 0;

	memset(&pdata_local, 0, sizeof(struct msm_pm_init_data_type));

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return  0;
	msm_pc_debug_counters_phys = res->start;
	WARN_ON(resource_size(res) < SZ_64);
	msm_pc_debug_counters = devm_ioremap(&pdev->dev, res->start,
					resource_size(res));
	if (msm_pc_debug_counters) {
		for (i = 0; i < resource_size(res)/4; i++)
			__raw_writel(0, msm_pc_debug_counters + i * 4);

		dent = debugfs_create_file("pc_debug_counter", S_IRUGO, NULL,
				msm_pc_debug_counters,
				&msm_pc_debug_counters_fops);
		if (!dent)
			pr_err("%s: ERROR debugfs_create_file failed\n",
					__func__);
	} else {
		msm_pc_debug_counters = 0;
		msm_pc_debug_counters_phys = 0;
	}

	if (pdev->dev.of_node) {
		enum msm_pm_pc_mode_type pc_mode;

		ret = msm_pm_clk_init(pdev);
		if (ret) {
			pr_info("msm_pm_clk_init returned error\n");
			return ret;
		}

		key = "qcom,pc-mode";
		ret = msm_pm_get_pc_mode(pdev->dev.of_node, key, &pc_mode);
		if (ret) {
			pr_debug("%s: Error reading key %s", __func__, key);
			return -EINVAL;
		}
		msm_pm_set_flush_fn(pc_mode);
	}

	msm_pm_init();
	if (pdev->dev.of_node)
		of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

	return ret;
}

static struct of_device_id msm_cpu_pm_table[] = {
	{.compatible = "qcom,pm-8x60"},
	{},
};

static struct platform_driver msm_cpu_pm_driver = {
	.probe = msm_cpu_pm_probe,
	.driver = {
		.name = "pm-8x60",
		.owner = THIS_MODULE,
		.of_match_table = msm_cpu_pm_table,
	},
};

static int __init msm_cpu_pm_init(void)
{
	int rc;

	cpumask_clear(&retention_cpus);

	rc = platform_driver_register(&msm_cpu_pm_snoc_client_driver);

	if (rc) {
		pr_err("%s(): failed to register driver %s\n", __func__,
				msm_cpu_pm_snoc_client_driver.driver.name);
		return rc;
	}

	return platform_driver_register(&msm_cpu_pm_driver);
}
device_initcall(msm_cpu_pm_init);

void __init msm_pm_sleep_status_init(void)
{
	platform_driver_register(&msm_cpu_status_driver);
}