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: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 5cfcf8c..d404aa0 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -15,6 +15,7 @@
*/
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <asm/unaligned.h>
#include "ath9k.h"
@@ -30,6 +31,19 @@
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 @@
.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 @@
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: