ath9k: Add a debugfs file for dumping DMA status
Debugfs file location: ath9k/<wiphy>/dma
Contains values in DMA debug registers.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/debug.c b/drivers/net/wireless/ath9k/debug.c
index c146e48..da52812 100644
--- a/drivers/net/wireless/ath9k/debug.c
+++ b/drivers/net/wireless/ath9k/debug.c
@@ -15,6 +15,8 @@
*/
#include "core.h"
+#include "reg.h"
+#include "hw.h"
static unsigned int ath9k_debug = DBG_DEFAULT;
module_param_named(debug, ath9k_debug, uint, 0);
@@ -34,6 +36,98 @@
}
}
+static int ath9k_debugfs_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t read_file_dma(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ath_softc *sc = file->private_data;
+ struct ath_hal *ah = sc->sc_ah;
+ char buf[1024];
+ unsigned int len = 0;
+ u32 val[ATH9K_NUM_DMA_DEBUG_REGS];
+ int i, qcuOffset = 0, dcuOffset = 0;
+ u32 *qcuBase = &val[0], *dcuBase = &val[4];
+
+ REG_WRITE(ah, AR_MACMISC,
+ ((AR_MACMISC_DMA_OBS_LINE_8 << AR_MACMISC_DMA_OBS_S) |
+ (AR_MACMISC_MISC_OBS_BUS_1 <<
+ AR_MACMISC_MISC_OBS_BUS_MSB_S)));
+
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "Raw DMA Debug values:\n");
+
+ for (i = 0; i < ATH9K_NUM_DMA_DEBUG_REGS; i++) {
+ if (i % 4 == 0)
+ len += snprintf(buf + len, sizeof(buf) - len, "\n");
+
+ val[i] = REG_READ(ah, AR_DMADBG_0 + (i * sizeof(u32)));
+ len += snprintf(buf + len, sizeof(buf) - len, "%d: %08x ",
+ i, val[i]);
+ }
+
+ len += snprintf(buf + len, sizeof(buf) - len, "\n\n");
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "Num QCU: chain_st fsp_ok fsp_st DCU: chain_st\n");
+
+ for (i = 0; i < ATH9K_NUM_QUEUES; i++, qcuOffset += 4, dcuOffset += 5) {
+ if (i == 8) {
+ qcuOffset = 0;
+ qcuBase++;
+ }
+
+ if (i == 6) {
+ dcuOffset = 0;
+ dcuBase++;
+ }
+
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "%2d %2x %1x %2x %2x\n",
+ i, (*qcuBase & (0x7 << qcuOffset)) >> qcuOffset,
+ (*qcuBase & (0x8 << qcuOffset)) >> (qcuOffset + 3),
+ val[2] & (0x7 << (i * 3)) >> (i * 3),
+ (*dcuBase & (0x1f << dcuOffset)) >> dcuOffset);
+ }
+
+ len += snprintf(buf + len, sizeof(buf) - len, "\n");
+
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "qcu_stitch state: %2x qcu_fetch state: %2x\n",
+ (val[3] & 0x003c0000) >> 18, (val[3] & 0x03c00000) >> 22);
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "qcu_complete state: %2x dcu_complete state: %2x\n",
+ (val[3] & 0x1c000000) >> 26, (val[6] & 0x3));
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "dcu_arb state: %2x dcu_fp state: %2x\n",
+ (val[5] & 0x06000000) >> 25, (val[5] & 0x38000000) >> 27);
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "chan_idle_dur: %3d chan_idle_dur_valid: %1d\n",
+ (val[6] & 0x000003fc) >> 2, (val[6] & 0x00000400) >> 10);
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "txfifo_valid_0: %1d txfifo_valid_1: %1d\n",
+ (val[6] & 0x00000800) >> 11, (val[6] & 0x00001000) >> 12);
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "txfifo_dcu_num_0: %2d txfifo_dcu_num_1: %2d\n",
+ (val[6] & 0x0001e000) >> 13, (val[6] & 0x001e0000) >> 17);
+
+ len += snprintf(buf + len, sizeof(buf) - len, "pcu observe: 0x%x \n",
+ REG_READ(ah, AR_OBS_BUS_1));
+ len += snprintf(buf + len, sizeof(buf) - len,
+ "AR_CR: 0x%x \n", REG_READ(ah, AR_CR));
+
+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_dma = {
+ .read = read_file_dma,
+ .open = ath9k_debugfs_open,
+ .owner = THIS_MODULE
+};
+
int ath9k_init_debug(struct ath_softc *sc)
{
sc->sc_debug.debug_mask = ath9k_debug;
@@ -47,6 +141,11 @@
if (!sc->sc_debug.debugfs_phy)
goto err;
+ sc->sc_debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,
+ sc->sc_debug.debugfs_phy, sc, &fops_dma);
+ if (!sc->sc_debug.debugfs_dma)
+ goto err;
+
return 0;
err:
ath9k_exit_debug(sc);
@@ -55,6 +154,7 @@
void ath9k_exit_debug(struct ath_softc *sc)
{
+ debugfs_remove(sc->sc_debug.debugfs_dma);
debugfs_remove(sc->sc_debug.debugfs_phy);
debugfs_remove(sc->sc_debug.debugfs_root);
}