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
show_max(struct seq_file * seq,struct s3c_freq * f)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
board_show(struct seq_file * seq,void * p)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
info_show(struct seq_file * seq,void * p)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
io_show(struct seq_file * seq,void * p)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
s3c_freq_debugfs_init(void)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
164