ath6kl: read fwlog from firmware ring buffer

Firmare sends the logs only when it's internal ring buffer is full. But
if firmware crashes we need to retrieve the latest logs through diagnose
window. This is now done everytime the debugfs file is read.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/main.c b/drivers/net/wireless/ath/ath6kl/main.c
index e346f835e779..937c7a238c12 100644
--- a/drivers/net/wireless/ath/ath6kl/main.c
+++ b/drivers/net/wireless/ath/ath6kl/main.c
@@ -309,6 +309,81 @@ int ath6kl_diag_write(struct ath6kl *ar, u32 address, void *data, u32 length)
 	return 0;
 }
 
+int ath6kl_read_fwlogs(struct ath6kl *ar)
+{
+	struct ath6kl_dbglog_hdr debug_hdr;
+	struct ath6kl_dbglog_buf debug_buf;
+	u32 address, length, dropped, firstbuf, debug_hdr_addr;
+	int ret = 0, loop;
+	u8 *buf;
+
+	buf = kmalloc(ATH6KL_FWLOG_PAYLOAD_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	address = TARG_VTOP(ar->target_type,
+			    ath6kl_get_hi_item_addr(ar,
+						    HI_ITEM(hi_dbglog_hdr)));
+
+	ret = ath6kl_diag_read32(ar, address, &debug_hdr_addr);
+	if (ret)
+		goto out;
+
+	/* Get the contents of the ring buffer */
+	if (debug_hdr_addr == 0) {
+		ath6kl_warn("Invalid address for debug_hdr_addr\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	address = TARG_VTOP(ar->target_type, debug_hdr_addr);
+	ath6kl_diag_read(ar, address, &debug_hdr, sizeof(debug_hdr));
+
+	address = TARG_VTOP(ar->target_type,
+			    le32_to_cpu(debug_hdr.dbuf_addr));
+	firstbuf = address;
+	dropped = le32_to_cpu(debug_hdr.dropped);
+	ath6kl_diag_read(ar, address, &debug_buf, sizeof(debug_buf));
+
+	loop = 100;
+
+	do {
+		address = TARG_VTOP(ar->target_type,
+				    le32_to_cpu(debug_buf.buffer_addr));
+		length = le32_to_cpu(debug_buf.length);
+
+		if (length != 0 && (le32_to_cpu(debug_buf.length) <=
+				    le32_to_cpu(debug_buf.bufsize))) {
+			length = ALIGN(length, 4);
+
+			ret = ath6kl_diag_read(ar, address,
+					       buf, length);
+			if (ret)
+				goto out;
+
+			ath6kl_debug_fwlog_event(ar, buf, length);
+		}
+
+		address = TARG_VTOP(ar->target_type,
+				    le32_to_cpu(debug_buf.next));
+		ath6kl_diag_read(ar, address, &debug_buf, sizeof(debug_buf));
+		if (ret)
+			goto out;
+
+		loop--;
+
+		if (WARN_ON(loop == 0)) {
+			ret = -ETIMEDOUT;
+			goto out;
+		}
+	} while (address != firstbuf);
+
+out:
+	kfree(buf);
+
+	return ret;
+}
+
 /* FIXME: move to a better place, target.h? */
 #define AR6003_RESET_CONTROL_ADDRESS 0x00004000
 #define AR6004_RESET_CONTROL_ADDRESS 0x00004000