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Commit 582d0064 authored by Vasanthakumar Thiagarajan's avatar Vasanthakumar Thiagarajan Committed by John W. Linville
Browse files

ath9k: Add a debugfs interface to dump chip registers 



/<debugfs_root>/ieee80211/phyX/ath9k/regdump is the interface
to dump the registers.

Signed-off-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarVasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 6410db59

drivers/net/wireless/ath/ath9k/debug.c

+54 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
 */



#include <linux/slab.h>

#include <linux/vmalloc.h>

#include <asm/unaligned.h>



#include "ath9k.h"
@@ -30,6 +31,19 @@ static int ath9k_debugfs_open(struct inode *inode, struct file *file) 
	return 0;

}



static ssize_t ath9k_debugfs_read_buf(struct file *file, char __user *user_buf,

				      size_t count, loff_t *ppos)

{

	u8 *buf = file->private_data;

	return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));

}



static int ath9k_debugfs_release_buf(struct inode *inode, struct file *file)

{

	vfree(file->private_data);

	return 0;

}



#ifdef CONFIG_ATH_DEBUG



static ssize_t read_file_debug(struct file *file, char __user *user_buf,
@@ -1027,6 +1041,42 @@ static const struct file_operations fops_regval = { 
	.llseek = default_llseek,

};



#define REGDUMP_LINE_SIZE	20



static int open_file_regdump(struct inode *inode, struct file *file)

{

	struct ath_softc *sc = inode->i_private;

	unsigned int len = 0;

	u8 *buf;

	int i;

	unsigned long num_regs, regdump_len, max_reg_offset;



	max_reg_offset = AR_SREV_9300_20_OR_LATER(sc->sc_ah) ? 0x16bd4 : 0xb500;

	num_regs = max_reg_offset / 4 + 1;

	regdump_len = num_regs * REGDUMP_LINE_SIZE + 1;

	buf = vmalloc(regdump_len);

	if (!buf)

		return -ENOMEM;



	ath9k_ps_wakeup(sc);

	for (i = 0; i < num_regs; i++)

		len += scnprintf(buf + len, regdump_len - len,

			"0x%06x 0x%08x\n", i << 2, REG_READ(sc->sc_ah, i << 2));

	ath9k_ps_restore(sc);



	file->private_data = buf;



	return 0;

}



static const struct file_operations fops_regdump = {

	.open = open_file_regdump,

	.read = ath9k_debugfs_read_buf,

	.release = ath9k_debugfs_release_buf,

	.owner = THIS_MODULE,

	.llseek = default_llseek,/* read accesses f_pos */

};



int ath9k_init_debug(struct ath_hw *ah)

{

	struct ath_common *common = ath9k_hw_common(ah);
@@ -1091,6 +1141,10 @@ int ath9k_init_debug(struct ath_hw *ah) 
			sc->debug.debugfs_phy, &ah->config.cwm_ignore_extcca))

		goto err;



	if (!debugfs_create_file("regdump", S_IRUSR, sc->debug.debugfs_phy,

			sc, &fops_regdump))

		goto err;



	sc->debug.regidx = 0;

	return 0;

err: