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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e6d197a695
Add debugfs support for the cpufreq driver to allow information about the system state to be exported to the user. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
200 lines
4.6 KiB
C
200 lines
4.6 KiB
C
/* linux/arch/arm/plat-s3c24xx/cpu-freq-debugfs.c
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*
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* Copyright (c) 2009 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX CPU Frequency scaling - debugfs status support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/cpufreq.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/err.h>
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#include <plat/cpu-freq-core.h>
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static struct dentry *dbgfs_root;
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static struct dentry *dbgfs_file_io;
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static struct dentry *dbgfs_file_info;
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static struct dentry *dbgfs_file_board;
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#define print_ns(x) ((x) / 10), ((x) % 10)
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static void show_max(struct seq_file *seq, struct s3c_freq *f)
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{
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seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
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f->fclk, f->hclk, f->pclk, f->armclk);
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}
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static int board_show(struct seq_file *seq, void *p)
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{
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struct s3c_cpufreq_config *cfg;
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struct s3c_cpufreq_board *brd;
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cfg = s3c_cpufreq_getconfig();
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if (!cfg) {
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seq_printf(seq, "no configuration registered\n");
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return 0;
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}
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brd = cfg->board;
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if (!brd) {
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seq_printf(seq, "no board definition set?\n");
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return 0;
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}
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seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
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seq_printf(seq, "auto_io=%u\n", brd->auto_io);
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seq_printf(seq, "need_io=%u\n", brd->need_io);
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show_max(seq, &brd->max);
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return 0;
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}
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static int fops_board_open(struct inode *inode, struct file *file)
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{
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return single_open(file, board_show, NULL);
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}
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static const struct file_operations fops_board = {
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.open = fops_board_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int info_show(struct seq_file *seq, void *p)
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{
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struct s3c_cpufreq_config *cfg;
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cfg = s3c_cpufreq_getconfig();
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if (!cfg) {
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seq_printf(seq, "no configuration registered\n");
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return 0;
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}
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seq_printf(seq, " FCLK %ld Hz\n", cfg->freq.fclk);
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seq_printf(seq, " HCLK %ld Hz (%lu.%lu ns)\n",
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cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
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seq_printf(seq, " PCLK %ld Hz\n", cfg->freq.hclk);
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seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
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seq_printf(seq, "\n");
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show_max(seq, &cfg->max);
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seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
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cfg->divs.h_divisor, cfg->divs.p_divisor,
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cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
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seq_printf(seq, "\n");
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seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
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return 0;
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}
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static int fops_info_open(struct inode *inode, struct file *file)
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{
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return single_open(file, info_show, NULL);
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}
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static const struct file_operations fops_info = {
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.open = fops_info_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int io_show(struct seq_file *seq, void *p)
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{
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void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
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struct s3c_cpufreq_config *cfg;
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struct s3c_iotimings *iot;
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union s3c_iobank *iob;
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int bank;
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cfg = s3c_cpufreq_getconfig();
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if (!cfg) {
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seq_printf(seq, "no configuration registered\n");
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return 0;
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}
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show_bank = cfg->info->debug_io_show;
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if (!show_bank) {
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seq_printf(seq, "no code to show bank timing\n");
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return 0;
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}
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iot = s3c_cpufreq_getiotimings();
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if (!iot) {
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seq_printf(seq, "no io timings registered\n");
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return 0;
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}
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seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
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for (bank = 0; bank < MAX_BANKS; bank++) {
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iob = &iot->bank[bank];
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seq_printf(seq, "bank %d: ", bank);
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if (!iob->io_2410) {
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seq_printf(seq, "nothing set\n");
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continue;
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}
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show_bank(seq, cfg, iob);
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}
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return 0;
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}
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static int fops_io_open(struct inode *inode, struct file *file)
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{
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return single_open(file, io_show, NULL);
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}
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static const struct file_operations fops_io = {
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.open = fops_io_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static int __init s3c_freq_debugfs_init(void)
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{
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dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
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if (IS_ERR(dbgfs_root)) {
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printk(KERN_ERR "%s: error creating debugfs root\n", __func__);
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return PTR_ERR(dbgfs_root);
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}
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dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
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NULL, &fops_io);
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dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
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NULL, &fops_info);
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dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
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NULL, &fops_board);
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return 0;
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}
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late_initcall(s3c_freq_debugfs_init);
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