drivers/cpufreq/s3c24xx-cpufreq-debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   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
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/export.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ioport.h>
  16 #include <linux/cpufreq.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/err.h>
  20
  21 #include <linux/soc/samsung/s3c-cpufreq-core.h>
  22
  23 static struct dentry *dbgfs_root;
  24 static struct dentry *dbgfs_file_io;
  25 static struct dentry *dbgfs_file_info;
  26 static struct dentry *dbgfs_file_board;
  27
  28 #define print_ns(x) ((x) / 10), ((x) % 10)
  29
  30 static void show_max(struct seq_file *seq, struct s3c_freq *f)
  31 {
  32         seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
  33                    f->fclk, f->hclk, f->pclk, f->armclk);
  34 }
  35
  36 static int board_show(struct seq_file *seq, void *p)
  37 {
  38         struct s3c_cpufreq_config *cfg;
  39         struct s3c_cpufreq_board *brd;
  40
  41         cfg = s3c_cpufreq_getconfig();
  42         if (!cfg) {
  43                 seq_printf(seq, "no configuration registered\n");
  44                 return 0;
  45         }
  46
  47         brd = cfg->board;
  48         if (!brd) {
  49                 seq_printf(seq, "no board definition set?\n");
  50                 return 0;
  51         }
  52
  53         seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
  54         seq_printf(seq, "auto_io=%u\n", brd->auto_io);
  55         seq_printf(seq, "need_io=%u\n", brd->need_io);
  56
  57         show_max(seq, &brd->max);
  58
  59
  60         return 0;
  61 }
  62
  63 DEFINE_SHOW_ATTRIBUTE(board);
  64
  65 static int info_show(struct seq_file *seq, void *p)
  66 {
  67         struct s3c_cpufreq_config *cfg;
  68
  69         cfg = s3c_cpufreq_getconfig();
  70         if (!cfg) {
  71                 seq_printf(seq, "no configuration registered\n");
  72                 return 0;
  73         }
  74
  75         seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
  76         seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
  77                    cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
  78         seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
  79         seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
  80         seq_printf(seq, "\n");
  81
  82         show_max(seq, &cfg->max);
  83
  84         seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
  85                    cfg->divs.h_divisor, cfg->divs.p_divisor,
  86                    cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
  87         seq_printf(seq, "\n");
  88
  89         seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
  90
  91         return 0;
  92 }
  93
  94 DEFINE_SHOW_ATTRIBUTE(info);
  95
  96 static int io_show(struct seq_file *seq, void *p)
  97 {
  98         void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
  99         struct s3c_cpufreq_config *cfg;
 100         struct s3c_iotimings *iot;
 101         union s3c_iobank *iob;
 102         int bank;
 103
 104         cfg = s3c_cpufreq_getconfig();
 105         if (!cfg) {
 106                 seq_printf(seq, "no configuration registered\n");
 107                 return 0;
 108         }
 109
 110         show_bank = cfg->info->debug_io_show;
 111         if (!show_bank) {
 112                 seq_printf(seq, "no code to show bank timing\n");
 113                 return 0;
 114         }
 115
 116         iot = s3c_cpufreq_getiotimings();
 117         if (!iot) {
 118                 seq_printf(seq, "no io timings registered\n");
 119                 return 0;
 120         }
 121
 122         seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
 123
 124         for (bank = 0; bank < MAX_BANKS; bank++) {
 125                 iob = &iot->bank[bank];
 126
 127                 seq_printf(seq, "bank %d: ", bank);
 128
 129                 if (!iob->io_2410) {
 130                         seq_printf(seq, "nothing set\n");
 131                         continue;
 132                 }
 133
 134                 show_bank(seq, cfg, iob);
 135         }
 136
 137         return 0;
 138 }
 139
 140 DEFINE_SHOW_ATTRIBUTE(io);
 141
 142 static int __init s3c_freq_debugfs_init(void)
 143 {
 144         dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
 145         if (IS_ERR(dbgfs_root)) {
 146                 pr_err("%s: error creating debugfs root\n", __func__);
 147                 return PTR_ERR(dbgfs_root);
 148         }
 149
 150         dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
 151                                             NULL, &io_fops);
 152
 153         dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
 154                                               NULL, &info_fops);
 155
 156         dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
 157                                                NULL, &board_fops);
 158
 159         return 0;
 160 }
 161
 162 late_initcall(s3c_freq_debugfs_init);
 163