LXR linux/arch/mips/jz4740/clock-debugfs.c

   1/*
   2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3 *  JZ4740 SoC clock support debugfs entries
   4 *
   5 *  This program is free software; you can redistribute it and/or modify it
   6 *  under  the terms of the GNU General  Public License as published by the
   7 *  Free Software Foundation;  either version 2 of the License, or (at your
   8 *  option) any later version.
   9 *
  10 *  You should have received a copy of the GNU General Public License along
  11 *  with this program; if not, write to the Free Software Foundation, Inc.,
  12 *  675 Mass Ave, Cambridge, MA 02139, USA.
  13 *
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/module.h>
  18#include <linux/clk.h>
  19#include <linux/err.h>
  20
  21#include <linux/debugfs.h>
  22#include <linux/uaccess.h>
  23
  24#include <asm/mach-jz4740/clock.h>
  25#include "clock.h"
  26
  27static struct dentry *jz4740_clock_debugfs;
  28
  29static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
  30{
  31        struct clk *clk = data;
  32        *value = clk_is_enabled(clk);
  33
  34        return 0;
  35}
  36
  37static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
  38{
  39        struct clk *clk = data;
  40
  41        if (value)
  42                return clk_enable(clk);
  43        else
  44                clk_disable(clk);
  45
  46        return 0;
  47}
  48
  49DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
  50        jz4740_clock_debugfs_show_enabled,
  51        jz4740_clock_debugfs_set_enabled,
  52        "%llu\n");
  53
  54static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
  55{
  56        struct clk *clk = data;
  57        *value = clk_get_rate(clk);
  58
  59        return 0;
  60}
  61
  62DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
  63        jz4740_clock_debugfs_show_rate,
  64        NULL,
  65        "%llu\n");
  66
  67void jz4740_clock_debugfs_add_clk(struct clk *clk)
  68{
  69        if (!jz4740_clock_debugfs)
  70                return;
  71
  72        clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
  73        debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
  74                                &jz4740_clock_debugfs_ops_rate);
  75        debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
  76                                &jz4740_clock_debugfs_ops_enabled);
  77
  78        if (clk->parent) {
  79                char parent_path[100];
  80                snprintf(parent_path, 100, "../%s", clk->parent->name);
  81                clk->debugfs_parent_entry = debugfs_create_symlink("parent",
  82                                                clk->debugfs_entry,
  83                                                parent_path);
  84        }
  85}
  86
  87/* TODO: Locking */
  88void jz4740_clock_debugfs_update_parent(struct clk *clk)
  89{
  90        if (clk->debugfs_parent_entry)
  91                debugfs_remove(clk->debugfs_parent_entry);
  92
  93        if (clk->parent) {
  94                char parent_path[100];
  95                snprintf(parent_path, 100, "../%s", clk->parent->name);
  96                clk->debugfs_parent_entry = debugfs_create_symlink("parent",
  97                                                clk->debugfs_entry,
  98                                                parent_path);
  99        } else {
 100                clk->debugfs_parent_entry = NULL;
 101        }
 102}
 103
 104void jz4740_clock_debugfs_init(void)
 105{
 106        jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
 107        if (IS_ERR(jz4740_clock_debugfs))
 108                jz4740_clock_debugfs = NULL;
 109}
 110