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 static int fops_board_open(struct inode *inode, struct file *file)
  67 {
  68         return single_open(file, board_show, NULL);
  69 }
  70
  71 static const struct file_operations fops_board = {
  72         .open           = fops_board_open,
  73         .read           = seq_read,
  74         .llseek         = seq_lseek,
  75         .release        = single_release,
  76         .owner          = THIS_MODULE,
  77 };
  78
  79 static int info_show(struct seq_file *seq, void *p)
  80 {
  81         struct s3c_cpufreq_config *cfg;
  82
  83         cfg = s3c_cpufreq_getconfig();
  84         if (!cfg) {
  85                 seq_printf(seq, "no configuration registered\n");
  86                 return 0;
  87         }
  88
  89         seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
  90         seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
  91                    cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
  92         seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
  93         seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
  94         seq_printf(seq, "\n");
  95
  96         show_max(seq, &cfg->max);
  97
  98         seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
  99                    cfg->divs.h_divisor, cfg->divs.p_divisor,
 100                    cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
 101         seq_printf(seq, "\n");
 102
 103         seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
 104
 105         return 0;
 106 }
 107
 108 static int fops_info_open(struct inode *inode, struct file *file)
 109 {
 110         return single_open(file, info_show, NULL);
 111 }
 112
 113 static const struct file_operations fops_info = {
 114         .open           = fops_info_open,
 115         .read           = seq_read,
 116         .llseek         = seq_lseek,
 117         .release        = single_release,
 118         .owner          = THIS_MODULE,
 119 };
 120
 121 static int io_show(struct seq_file *seq, void *p)
 122 {
 123         void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
 124         struct s3c_cpufreq_config *cfg;
 125         struct s3c_iotimings *iot;
 126         union s3c_iobank *iob;
 127         int bank;
 128
 129         cfg = s3c_cpufreq_getconfig();
 130         if (!cfg) {
 131                 seq_printf(seq, "no configuration registered\n");
 132                 return 0;
 133         }
 134
 135         show_bank = cfg->info->debug_io_show;
 136         if (!show_bank) {
 137                 seq_printf(seq, "no code to show bank timing\n");
 138                 return 0;
 139         }
 140
 141         iot = s3c_cpufreq_getiotimings();
 142         if (!iot) {
 143                 seq_printf(seq, "no io timings registered\n");
 144                 return 0;
 145         }
 146
 147         seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
 148
 149         for (bank = 0; bank < MAX_BANKS; bank++) {
 150                 iob = &iot->bank[bank];
 151
 152                 seq_printf(seq, "bank %d: ", bank);
 153
 154                 if (!iob->io_2410) {
 155                         seq_printf(seq, "nothing set\n");
 156                         continue;
 157                 }
 158
 159                 show_bank(seq, cfg, iob);
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int fops_io_open(struct inode *inode, struct file *file)
 166 {
 167         return single_open(file, io_show, NULL);
 168 }
 169
 170 static const struct file_operations fops_io = {
 171         .open           = fops_io_open,
 172         .read           = seq_read,
 173         .llseek         = seq_lseek,
 174         .release        = single_release,
 175         .owner          = THIS_MODULE,
 176 };
 177
 178
 179 static int __init s3c_freq_debugfs_init(void)
 180 {
 181         dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
 182         if (IS_ERR(dbgfs_root)) {
 183                 pr_err("%s: error creating debugfs root\n", __func__);
 184                 return PTR_ERR(dbgfs_root);
 185         }
 186
 187         dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
 188                                             NULL, &fops_io);
 189
 190         dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
 191                                               NULL, &fops_info);
 192
 193         dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
 194                                                NULL, &fops_board);
 195
 196         return 0;
 197 }
 198
 199 late_initcall(s3c_freq_debugfs_init);
 200