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Commit e6d197a6 authored by Ben Dooks's avatar Ben Dooks Committed by Ben Dooks
Browse files

ARM: S3C: CPUFREQ: Add debugfs support for cpufreq 



Add debugfs support for the cpufreq driver to allow
information about the system state to be exported to
the user.

Signed-off-by: default avatarBen Dooks <ben@simtec.co.uk>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent dfff4e95

arch/arm/Kconfig

+6 −0
Original line number Original line Diff line number Diff line
@@ -1329,6 +1329,12 @@ config CPU_FREQ_S3C24XX_IODEBUG 
	help

	help

	  Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core

	  Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core





config CPU_FREQ_S3C24XX_DEBUGFS

	bool "Export debugfs for CPUFreq"

	depends on CPU_FREQ_S3C24XX && DEBUG_FS

	help

	  Export status information via debugfs.



endif

endif





source "drivers/cpuidle/Kconfig"

source "drivers/cpuidle/Kconfig"

arch/arm/mach-s3c2410/cpu-freq.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -111,6 +111,8 @@ static struct s3c_cpufreq_info s3c2410_cpufreq_info = { 
	.set_refresh	= s3c2410_cpufreq_setrefresh,

	.set_refresh	= s3c2410_cpufreq_setrefresh,

	.set_divs	= s3c2410_cpufreq_setdivs,

	.set_divs	= s3c2410_cpufreq_setdivs,

	.calc_divs	= s3c2410_cpufreq_calcdivs,

	.calc_divs	= s3c2410_cpufreq_calcdivs,



	.debug_io_show	= s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),

};

};





static int s3c2410_cpufreq_add(struct sys_device *sysdev)

static int s3c2410_cpufreq_add(struct sys_device *sysdev)

arch/arm/mach-s3c2412/cpu-freq.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -190,6 +190,8 @@ static struct s3c_cpufreq_info s3c2412_cpufreq_info = { 
	.get_iotiming	= s3c2412_iotiming_get,

	.get_iotiming	= s3c2412_iotiming_get,





	.resume_clocks	= s3c2412_setup_clocks,

	.resume_clocks	= s3c2412_setup_clocks,



	.debug_io_show  = s3c_cpufreq_debugfs_call(s3c2412_iotiming_debugfs),

};

};





static int s3c2412_cpufreq_add(struct sys_device *sysdev)

static int s3c2412_cpufreq_add(struct sys_device *sysdev)

arch/arm/plat-s3c24xx/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -21,6 +21,7 @@ obj-y += clock.o 
obj-$(CONFIG_S3C24XX_DCLK)	+= clock-dclk.o

obj-$(CONFIG_S3C24XX_DCLK)	+= clock-dclk.o





obj-$(CONFIG_CPU_FREQ_S3C24XX)	+= cpu-freq.o

obj-$(CONFIG_CPU_FREQ_S3C24XX)	+= cpu-freq.o

obj-$(CONFIG_CPU_FREQ_S3C24XX_DEBUGFS) += cpu-freq-debugfs.o





# Architecture dependant builds

# Architecture dependant builds

arch/arm/plat-s3c24xx/cpu-freq-debugfs.c

0 → 100644
+199 −0
Original line number Original line Diff line number Diff line 
/* linux/arch/arm/plat-s3c24xx/cpu-freq-debugfs.c

 *

 * Copyright (c) 2009 Simtec Electronics

 *	http://armlinux.simtec.co.uk/

 *	Ben Dooks <ben@simtec.co.uk>

 *

 * 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/module.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);