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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/init.h>
  16 #include <linux/export.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ioport.h>
  19 #include <linux/cpufreq.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/err.h>
  23
  24 #include <plat/cpu-freq-core.h>
  25
  26 static struct dentry *dbgfs_root;
  27 static struct dentry *dbgfs_file_io;
  28 static struct dentry *dbgfs_file_info;
  29 static struct dentry *dbgfs_file_board;
  30
  31 #define print_ns(x) ((x) / 10), ((x) % 10)
  32
  33 static void show_max(struct seq_file *seq, struct s3c_freq *f)
  34 {
  35         seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
  36                    f->fclk, f->hclk, f->pclk, f->armclk);
  37 }
  38
  39 static int board_show(struct seq_file *seq, void *p)
  40 {
  41         struct s3c_cpufreq_config *cfg;
  42         struct s3c_cpufreq_board *brd;
  43
  44         cfg = s3c_cpufreq_getconfig();
  45         if (!cfg) {
  46                 seq_printf(seq, "no configuration registered\n");
  47                 return 0;
  48         }
  49
  50         brd = cfg->board;
  51         if (!brd) {
  52                 seq_printf(seq, "no board definition set?\n");
  53                 return 0;
  54         }
  55
  56         seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
  57         seq_printf(seq, "auto_io=%u\n", brd->auto_io);
  58         seq_printf(seq, "need_io=%u\n", brd->need_io);
  59
  60         show_max(seq, &brd->max);
  61
  62
  63         return 0;
  64 }
  65
  66 DEFINE_SHOW_ATTRIBUTE(board);
  67
  68 static int info_show(struct seq_file *seq, void *p)
  69 {
  70         struct s3c_cpufreq_config *cfg;
  71
  72         cfg = s3c_cpufreq_getconfig();
  73         if (!cfg) {
  74                 seq_printf(seq, "no configuration registered\n");
  75                 return 0;
  76         }
  77
  78         seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
  79         seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
  80                    cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
  81         seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
  82         seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
  83         seq_printf(seq, "\n");
  84
  85         show_max(seq, &cfg->max);
  86
  87         seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
  88                    cfg->divs.h_divisor, cfg->divs.p_divisor,
  89                    cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
  90         seq_printf(seq, "\n");
  91
  92         seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
  93
  94         return 0;
  95 }
  96
  97 DEFINE_SHOW_ATTRIBUTE(info);
  98
  99 static int io_show(struct seq_file *seq, void *p)
 100 {
 101         void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
 102         struct s3c_cpufreq_config *cfg;
 103         struct s3c_iotimings *iot;
 104         union s3c_iobank *iob;
 105         int bank;
 106
 107         cfg = s3c_cpufreq_getconfig();
 108         if (!cfg) {
 109                 seq_printf(seq, "no configuration registered\n");
 110                 return 0;
 111         }
 112
 113         show_bank = cfg->info->debug_io_show;
 114         if (!show_bank) {
 115                 seq_printf(seq, "no code to show bank timing\n");
 116                 return 0;
 117         }
 118
 119         iot = s3c_cpufreq_getiotimings();
 120         if (!iot) {
 121                 seq_printf(seq, "no io timings registered\n");
 122                 return 0;
 123         }
 124
 125         seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
 126
 127         for (bank = 0; bank < MAX_BANKS; bank++) {
 128                 iob = &iot->bank[bank];
 129
 130                 seq_printf(seq, "bank %d: ", bank);
 131
 132                 if (!iob->io_2410) {
 133                         seq_printf(seq, "nothing set\n");
 134                         continue;
 135                 }
 136
 137                 show_bank(seq, cfg, iob);
 138         }
 139
 140         return 0;
 141 }
 142
 143 DEFINE_SHOW_ATTRIBUTE(io);
 144
 145 static int __init s3c_freq_debugfs_init(void)
 146 {
 147         dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
 148         if (IS_ERR(dbgfs_root)) {
 149                 pr_err("%s: error creating debugfs root\n", __func__);
 150                 return PTR_ERR(dbgfs_root);
 151         }
 152
 153         dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
 154                                             NULL, &io_fops);
 155
 156         dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
 157                                               NULL, &info_fops);
 158
 159         dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
 160                                                NULL, &board_fops);
 161
 162         return 0;
 163 }
 164
 165 late_initcall(s3c_freq_debugfs_init);
 166