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 <plat/cpu-freq-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