1/* linux/arch/arm/plat-s3c24xx/cpu-freq-debugfs.c 2 * 3 * Copyright (c) 2009 Simtec Electronics 4 * http://armlinux.simtec.co.uk/ 5 * Ben Dooks <ben@simtec.co.uk> 6 * 7 * S3C24XX CPU Frequency scaling - debugfs status support 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12*/ 13 14#include <linux/init.h> 15#include <linux/module.h> 16#include <linux/interrupt.h> 17#include <linux/ioport.h> 18#include <linux/cpufreq.h> 19#include <linux/debugfs.h> 20#include <linux/seq_file.h> 21#include <linux/err.h> 22 23#include <plat/cpu-freq-core.h> 24 25static struct dentry *dbgfs_root; 26static struct dentry *dbgfs_file_io; 27static struct dentry *dbgfs_file_info; 28static struct dentry *dbgfs_file_board; 29 30#define print_ns(x) ((x) / 10), ((x) % 10) 31 32static void show_max(struct seq_file *seq, struct s3c_freq *f) 33{ 34 seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n", 35 f->fclk, f->hclk, f->pclk, f->armclk); 36} 37 38static int board_show(struct seq_file *seq, void *p) 39{ 40 struct s3c_cpufreq_config *cfg; 41 struct s3c_cpufreq_board *brd; 42 43 cfg = s3c_cpufreq_getconfig(); 44 if (!cfg) { 45 seq_printf(seq, "no configuration registered\n"); 46 return 0; 47 } 48 49 brd = cfg->board; 50 if (!brd) { 51 seq_printf(seq, "no board definition set?\n"); 52 return 0; 53 } 54 55 seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh); 56 seq_printf(seq, "auto_io=%u\n", brd->auto_io); 57 seq_printf(seq, "need_io=%u\n", brd->need_io); 58 59 show_max(seq, &brd->max); 60 61 62 return 0; 63} 64 65static int fops_board_open(struct inode *inode, struct file *file) 66{ 67 return single_open(file, board_show, NULL); 68} 69 70static const struct file_operations fops_board = { 71 .open = fops_board_open, 72 .read = seq_read, 73 .llseek = seq_lseek, 74 .release = single_release, 75 .owner = THIS_MODULE, 76}; 77 78static int info_show(struct seq_file *seq, void *p) 79{ 80 struct s3c_cpufreq_config *cfg; 81 82 cfg = s3c_cpufreq_getconfig(); 83 if (!cfg) { 84 seq_printf(seq, "no configuration registered\n"); 85 return 0; 86 } 87 88 seq_printf(seq, " FCLK %ld Hz\n", cfg->freq.fclk); 89 seq_printf(seq, " HCLK %ld Hz (%lu.%lu ns)\n", 90 cfg->freq.hclk, print_ns(cfg->freq.hclk_tns)); 91 seq_printf(seq, " PCLK %ld Hz\n", cfg->freq.hclk); 92 seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk); 93 seq_printf(seq, "\n"); 94 95 show_max(seq, &cfg->max); 96 97 seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n", 98 cfg->divs.h_divisor, cfg->divs.p_divisor, 99 cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off"); 100 seq_printf(seq, "\n"); 101 102 seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll); 103 104 return 0; 105} 106 107static int fops_info_open(struct inode *inode, struct file *file) 108{ 109 return single_open(file, info_show, NULL); 110} 111 112static const struct file_operations fops_info = { 113 .open = fops_info_open, 114 .read = seq_read, 115 .llseek = seq_lseek, 116 .release = single_release, 117 .owner = THIS_MODULE, 118}; 119 120static int io_show(struct seq_file *seq, void *p) 121{ 122 void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *); 123 struct s3c_cpufreq_config *cfg; 124 struct s3c_iotimings *iot; 125 union s3c_iobank *iob; 126 int bank; 127 128 cfg = s3c_cpufreq_getconfig(); 129 if (!cfg) { 130 seq_printf(seq, "no configuration registered\n"); 131 return 0; 132 } 133 134 show_bank = cfg->info->debug_io_show; 135 if (!show_bank) { 136 seq_printf(seq, "no code to show bank timing\n"); 137 return 0; 138 } 139 140 iot = s3c_cpufreq_getiotimings(); 141 if (!iot) { 142 seq_printf(seq, "no io timings registered\n"); 143 return 0; 144 } 145 146 seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns)); 147 148 for (bank = 0; bank < MAX_BANKS; bank++) { 149 iob = &iot->bank[bank]; 150 151 seq_printf(seq, "bank %d: ", bank); 152 153 if (!iob->io_2410) { 154 seq_printf(seq, "nothing set\n"); 155 continue; 156 } 157 158 show_bank(seq, cfg, iob); 159 } 160 161 return 0; 162} 163 164static int fops_io_open(struct inode *inode, struct file *file) 165{ 166 return single_open(file, io_show, NULL); 167} 168 169static const struct file_operations fops_io = { 170 .open = fops_io_open, 171 .read = seq_read, 172 .llseek = seq_lseek, 173 .release = single_release, 174 .owner = THIS_MODULE, 175}; 176 177 178static int __init s3c_freq_debugfs_init(void) 179{ 180 dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL); 181 if (IS_ERR(dbgfs_root)) { 182 printk(KERN_ERR "%s: error creating debugfs root\n", __func__); 183 return PTR_ERR(dbgfs_root); 184 } 185 186 dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root, 187 NULL, &fops_io); 188 189 dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root, 190 NULL, &fops_info); 191 192 dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root, 193 NULL, &fops_board); 194 195 return 0; 196} 197 198late_initcall(s3c_freq_debugfs_init); 199