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