LXR linux/arch/arm/mach-msm/clock-debug.c

   1/*
   2 * Copyright (C) 2007 Google, Inc.
   3 * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
   4 *
   5 * This software is licensed under the terms of the GNU General Public
   6 * License version 2, as published by the Free Software Foundation, and
   7 * may be copied, distributed, and modified under those terms.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/module.h>
  18#include <linux/ctype.h>
  19#include <linux/debugfs.h>
  20#include <linux/clk.h>
  21#include "clock.h"
  22
  23static int clock_debug_rate_set(void *data, u64 val)
  24{
  25        struct clk *clock = data;
  26        int ret;
  27
  28        /* Only increases to max rate will succeed, but that's actually good
  29         * for debugging purposes so we don't check for error. */
  30        if (clock->flags & CLK_MAX)
  31                clk_set_max_rate(clock, val);
  32        if (clock->flags & CLK_MIN)
  33                ret = clk_set_min_rate(clock, val);
  34        else
  35                ret = clk_set_rate(clock, val);
  36        if (ret != 0)
  37                printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
  38                        (clock->flags & CLK_MIN) ? "_min" : "", ret);
  39        return ret;
  40}
  41
  42static int clock_debug_rate_get(void *data, u64 *val)
  43{
  44        struct clk *clock = data;
  45        *val = clk_get_rate(clock);
  46        return 0;
  47}
  48
  49DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
  50                        clock_debug_rate_set, "%llu\n");
  51
  52static int clock_debug_enable_set(void *data, u64 val)
  53{
  54        struct clk *clock = data;
  55        int rc = 0;
  56
  57        if (val)
  58                rc = clock->ops->enable(clock->id);
  59        else
  60                clock->ops->disable(clock->id);
  61
  62        return rc;
  63}
  64
  65static int clock_debug_enable_get(void *data, u64 *val)
  66{
  67        struct clk *clock = data;
  68
  69        *val = clock->ops->is_enabled(clock->id);
  70
  71        return 0;
  72}
  73
  74DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
  75                        clock_debug_enable_set, "%llu\n");
  76
  77static int clock_debug_local_get(void *data, u64 *val)
  78{
  79        struct clk *clock = data;
  80
  81        *val = clock->ops->is_local(clock->id);
  82
  83        return 0;
  84}
  85
  86DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
  87                        NULL, "%llu\n");
  88
  89static struct dentry *debugfs_base;
  90
  91int __init clock_debug_init(void)
  92{
  93        debugfs_base = debugfs_create_dir("clk", NULL);
  94        if (!debugfs_base)
  95                return -ENOMEM;
  96        return 0;
  97}
  98
  99int __init clock_debug_add(struct clk *clock)
 100{
 101        char temp[50], *ptr;
 102        struct dentry *clk_dir;
 103
 104        if (!debugfs_base)
 105                return -ENOMEM;
 106
 107        strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
 108        for (ptr = temp; *ptr; ptr++)
 109                *ptr = tolower(*ptr);
 110
 111        clk_dir = debugfs_create_dir(temp, debugfs_base);
 112        if (!clk_dir)
 113                return -ENOMEM;
 114
 115        if (!debugfs_create_file("rate", S_IRUGO | S_IWUSR, clk_dir,
 116                                clock, &clock_rate_fops))
 117                goto error;
 118
 119        if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR, clk_dir,
 120                                clock, &clock_enable_fops))
 121                goto error;
 122
 123        if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
 124                                &clock_local_fops))
 125                goto error;
 126        return 0;
 127error:
 128        debugfs_remove_recursive(clk_dir);
 129        return -ENOMEM;
 130}
 131