linux/drivers/cpufreq/s3c24xx-cpufreq-debugfs.c
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   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
  24static struct dentry *dbgfs_root;
  25static struct dentry *dbgfs_file_io;
  26static struct dentry *dbgfs_file_info;
  27static struct dentry *dbgfs_file_board;
  28
  29#define print_ns(x) ((x) / 10), ((x) % 10)
  30
  31static 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
  37static 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
  64static int fops_board_open(struct inode *inode, struct file *file)
  65{
  66        return single_open(file, board_show, NULL);
  67}
  68
  69static 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
  77static 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
 106static int fops_info_open(struct inode *inode, struct file *file)
 107{
 108        return single_open(file, info_show, NULL);
 109}
 110
 111static 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
 119static 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
 163static int fops_io_open(struct inode *inode, struct file *file)
 164{
 165        return single_open(file, io_show, NULL);
 166}
 167
 168static 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
 177static 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
 197late_initcall(s3c_freq_debugfs_init);
 198
 199
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