arch/arm/plat-s3c24xx/cpu-freq-debugfs.c

   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/export.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
  25 static struct dentry *dbgfs_root;
  26 static struct dentry *dbgfs_file_io;
  27 static struct dentry *dbgfs_file_info;
  28 static struct dentry *dbgfs_file_board;
  29
  30 #define print_ns(x) ((x) / 10), ((x) % 10)
  31
  32 static 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
  38 static 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
  65 static int fops_board_open(struct inode *inode, struct file *file)
  66 {
  67         return single_open(file, board_show, NULL);
  68 }
  69
  70 static 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
  78 static 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
 107 static int fops_info_open(struct inode *inode, struct file *file)
 108 {
 109         return single_open(file, info_show, NULL);
 110 }
 111
 112 static 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
 120 static 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
 164 static int fops_io_open(struct inode *inode, struct file *file)
 165 {
 166         return single_open(file, io_show, NULL);
 167 }
 168
 169 static 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
 178 static 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
 198 late_initcall(s3c_freq_debugfs_init);
 199