drivers/cpufreq/s3c24xx-cpufreq-debugfs.c

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