pm-debug.c

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/*
 * OMAP Power Management debug routines
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Written by:
 * Richard Woodruff <[email protected]>
 * Tony Lindgren
 * Juha Yrjola
 * Amit Kucheria <[email protected]>
 * Igor Stoppa <[email protected]>
 * Jouni Hogander
 *
 * Based on pm.c for omap2
 *
 * 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/kernel.h>
#include <linux/sched.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <plat/clock.h>
#include "powerdomain.h"
#include "clockdomain.h"
#include <plat/dmtimer.h>
#include <plat/omap-pm.h>

#include "cm2xxx_3xxx.h"
#include "prm2xxx_3xxx.h"
#include "pm.h"

u32 enable_off_mode;

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>

static int pm_dbg_init_done;

static int pm_dbg_init(void);

enum {
    DEBUG_FILE_COUNTERS = 0,
    DEBUG_FILE_TIMERS,
};

static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
    "OFF",
    "RET",
    "INA",
    "ON"
};

void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
{
    s64 t;

    if (!pm_dbg_init_done)
        return ;

    /* Update timer for previous state */
    t = sched_clock();

    pwrdm->state_timer[prev] += t - pwrdm->timer;

    pwrdm->timer = t;
}

static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
{
    struct seq_file *s = (struct seq_file *)user;

    if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
        strcmp(clkdm->name, "wkup_clkdm") == 0 ||
        strncmp(clkdm->name, "dpll", 4) == 0)
        return 0;

    seq_printf(s, "%s->%s (%d)", clkdm->name,
            clkdm->pwrdm.ptr->name,
            atomic_read(&clkdm->usecount));
    seq_printf(s, "\n");

    return 0;
}

static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
{
    struct seq_file *s = (struct seq_file *)user;
    int i;

    if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
        strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
        strncmp(pwrdm->name, "dpll", 4) == 0)
        return 0;

    if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
        printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
            pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));

    seq_printf(s, "%s (%s)", pwrdm->name,
            pwrdm_state_names[pwrdm->state]);
    for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
        seq_printf(s, ",%s:%d", pwrdm_state_names[i],
            pwrdm->state_counter[i]);

    seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
    for (i = 0; i < pwrdm->banks; i++)
        seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
                pwrdm->ret_mem_off_counter[i]);

    seq_printf(s, "\n");

    return 0;
}

static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
{
    struct seq_file *s = (struct seq_file *)user;
    int i;

    if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
        strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
        strncmp(pwrdm->name, "dpll", 4) == 0)
        return 0;

    pwrdm_state_switch(pwrdm);

    seq_printf(s, "%s (%s)", pwrdm->name,
        pwrdm_state_names[pwrdm->state]);

    for (i = 0; i < 4; i++)
        seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
            pwrdm->state_timer[i]);

    seq_printf(s, "\n");
    return 0;
}

static int pm_dbg_show_counters(struct seq_file *s, void *unused)
{
    pwrdm_for_each(pwrdm_dbg_show_counter, s);
    clkdm_for_each(clkdm_dbg_show_counter, s);

    return 0;
}

static int pm_dbg_show_timers(struct seq_file *s, void *unused)
{
    pwrdm_for_each(pwrdm_dbg_show_timer, s);
    return 0;
}

static int pm_dbg_open(struct inode *inode, struct file *file)
{
    switch ((int)inode->i_private) {
    case DEBUG_FILE_COUNTERS:
        return single_open(file, pm_dbg_show_counters,
            &inode->i_private);
    case DEBUG_FILE_TIMERS:
    default:
        return single_open(file, pm_dbg_show_timers,
            &inode->i_private);
    }
}

static const struct file_operations debug_fops = {
    .open           = pm_dbg_open,
    .read           = seq_read,
    .llseek         = seq_lseek,
    .release        = single_release,
};

static int pwrdm_suspend_get(void *data, u64 *val)
{
    int ret = -EINVAL;

    if (cpu_is_omap34xx())
        ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
    *val = ret;

    if (ret >= 0)
        return 0;
    return *val;
}

static int pwrdm_suspend_set(void *data, u64 val)
{
    if (cpu_is_omap34xx())
        return omap3_pm_set_suspend_state(
            (struct powerdomain *)data, (int)val);
    return -EINVAL;
}

DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
            pwrdm_suspend_set, "%llu\n");

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
{
    int i;
    s64 t;
    struct dentry *d;

    t = sched_clock();

    for (i = 0; i < 4; i++)
        pwrdm->state_timer[i] = 0;

    pwrdm->timer = t;

    if (strncmp(pwrdm->name, "dpll", 4) == 0)
        return 0;

    d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
    if (!(IS_ERR_OR_NULL(d)))
        (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
            (void *)pwrdm, &pwrdm_suspend_fops);

    return 0;
}

static int option_get(void *data, u64 *val)
{
    u32 *option = data;

    *val = *option;

    return 0;
}

static int option_set(void *data, u64 val)
{
    u32 *option = data;

    *option = val;

    if (option == &enable_off_mode) {
        if (val)
            omap_pm_enable_off_mode();
        else
            omap_pm_disable_off_mode();
        if (cpu_is_omap34xx())
            omap3_pm_off_mode_enable(val);
    }

    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");

static int __init pm_dbg_init(void)
{
    struct dentry *d;

    if (pm_dbg_init_done)
        return 0;

    d = debugfs_create_dir("pm_debug", NULL);
    if (IS_ERR_OR_NULL(d))
        return PTR_ERR(d);

    (void) debugfs_create_file("count", S_IRUGO,
        d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
    (void) debugfs_create_file("time", S_IRUGO,
        d, (void *)DEBUG_FILE_TIMERS, &debug_fops);

    pwrdm_for_each(pwrdms_setup, (void *)d);

    (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
                   &enable_off_mode, &pm_dbg_option_fops);
    pm_dbg_init_done = 1;

    return 0;
}
arch_initcall(pm_dbg_init);

#endif