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
  27 static struct dentry *jz4740_clock_debugfs;
  28
  29 static 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
  37 static 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
  49 DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
  50         jz4740_clock_debugfs_show_enabled,
  51         jz4740_clock_debugfs_set_enabled,
  52         "%llu\n");
  53
  54 static 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
  62 DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
  63         jz4740_clock_debugfs_show_rate,
  64         NULL,
  65         "%llu\n");
  66
  67 void 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 */
  88 void 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
 104 void 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 }