cpu-freq-debugfs.c

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/* linux/arch/arm/plat-s3c24xx/cpu-freq-debugfs.c
 *
 * Copyright (c) 2009 Simtec Electronics
 *  http://armlinux.simtec.co.uk/
 *  Ben Dooks <[email protected]>
 *
 * S3C24XX CPU Frequency scaling - debugfs status support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/init.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/err.h>

#include <plat/cpu-freq-core.h>

static struct dentry *dbgfs_root;
static struct dentry *dbgfs_file_io;
static struct dentry *dbgfs_file_info;
static struct dentry *dbgfs_file_board;

#define print_ns(x) ((x) / 10), ((x) % 10)

static void show_max(struct seq_file *seq, struct s3c_freq *f)
{
    seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
           f->fclk, f->hclk, f->pclk, f->armclk);
}

static int board_show(struct seq_file *seq, void *p)
{
    struct s3c_cpufreq_config *cfg;
    struct s3c_cpufreq_board *brd;

    cfg = s3c_cpufreq_getconfig();
    if (!cfg) {
        seq_printf(seq, "no configuration registered\n");
        return 0;
    }

    brd = cfg->board;
    if (!brd) {
        seq_printf(seq, "no board definition set?\n");
        return 0;
    }

    seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
    seq_printf(seq, "auto_io=%u\n", brd->auto_io);
    seq_printf(seq, "need_io=%u\n", brd->need_io);

    show_max(seq, &brd->max);


    return 0;
}

static int fops_board_open(struct inode *inode, struct file *file)
{
    return single_open(file, board_show, NULL);
}

static const struct file_operations fops_board = {
    .open       = fops_board_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .owner      = THIS_MODULE,
};

static int info_show(struct seq_file *seq, void *p)
{
    struct s3c_cpufreq_config *cfg;

    cfg = s3c_cpufreq_getconfig();
    if (!cfg) {
        seq_printf(seq, "no configuration registered\n");
        return 0;
    }

    seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
    seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
           cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
    seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
    seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
    seq_printf(seq, "\n");

    show_max(seq, &cfg->max);

    seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
           cfg->divs.h_divisor, cfg->divs.p_divisor,
           cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
    seq_printf(seq, "\n");

    seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);

    return 0;
}

static int fops_info_open(struct inode *inode, struct file *file)
{
    return single_open(file, info_show, NULL);
}

static const struct file_operations fops_info = {
    .open       = fops_info_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .owner      = THIS_MODULE,
};

static int io_show(struct seq_file *seq, void *p)
{
    void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
    struct s3c_cpufreq_config *cfg;
    struct s3c_iotimings *iot;
    union s3c_iobank *iob;
    int bank;

    cfg = s3c_cpufreq_getconfig();
    if (!cfg) {
        seq_printf(seq, "no configuration registered\n");
        return 0;
    }

    show_bank = cfg->info->debug_io_show;
    if (!show_bank) {
        seq_printf(seq, "no code to show bank timing\n");
        return 0;
    }

    iot = s3c_cpufreq_getiotimings();
    if (!iot) {
        seq_printf(seq, "no io timings registered\n");
        return 0;
    }

    seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));

    for (bank = 0; bank < MAX_BANKS; bank++) {
        iob = &iot->bank[bank];

        seq_printf(seq, "bank %d: ", bank);

        if (!iob->io_2410) {
            seq_printf(seq, "nothing set\n");
            continue;
        }

        show_bank(seq, cfg, iob);
    }

    return 0;
}

static int fops_io_open(struct inode *inode, struct file *file)
{
    return single_open(file, io_show, NULL);
}

static const struct file_operations fops_io = {
    .open       = fops_io_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .owner      = THIS_MODULE,
};


static int __init s3c_freq_debugfs_init(void)
{
    dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
    if (IS_ERR(dbgfs_root)) {
        printk(KERN_ERR "%s: error creating debugfs root\n", __func__);
        return PTR_ERR(dbgfs_root);
    }

    dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
                        NULL, &fops_io);

    dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
                          NULL, &fops_info);

    dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
                           NULL, &fops_board);

    return 0;
}

late_initcall(s3c_freq_debugfs_init);