cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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s3c24xx-cpufreq-debugfs.c (3744B)

      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
     23static struct dentry *dbgfs_root;
     24static struct dentry *dbgfs_file_io;
     25static struct dentry *dbgfs_file_info;
     26static struct dentry *dbgfs_file_board;
     27
     28#define print_ns(x) ((x) / 10), ((x) % 10)
     29
     30static 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
     36static 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
     63DEFINE_SHOW_ATTRIBUTE(board);
     64
     65static 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
     94DEFINE_SHOW_ATTRIBUTE(info);
     95
     96static 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
    140DEFINE_SHOW_ATTRIBUTE(io);
    141
    142static 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
    162late_initcall(s3c_freq_debugfs_init);
    163