wl12xx: Support routing FW logs to the host

A recently added feature to the firmware enables the driver to retrieve
firmware logs via the host bus (SDIO or SPI).

There are two modes of operation:
1. On-demand: The FW collects its log in an internal ring buffer. This
   buffer can later be read, for example, upon recovery.
2. Continuous: The FW pushes the FW logs as special packets in the RX
   path.

Reading the internal ring buffer does not involve the FW. Thus, as long
as the HW is not in ELP, it should be possible to read the logs, even if
the FW crashes.

A sysfs binary file named "fwlog" was added to support this feature,
letting a monitor process read the FW messages. The log is transferred
from the FW only when available, so the reading process might block.

Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index 754a16ce5bc..d7db6e77047 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -226,6 +226,8 @@ enum {
 #define FW_VER_MINOR_1_SPARE_STA_MIN 58
 #define FW_VER_MINOR_1_SPARE_AP_MIN  47
 
+#define FW_VER_MINOR_FWLOG_STA_MIN 70
+
 struct wl1271_chip {
 	u32 id;
 	char fw_ver_str[ETHTOOL_BUSINFO_LEN];
@@ -284,8 +286,7 @@ struct wl1271_fw_sta_status {
 	u8  tx_total;
 	u8  reserved1;
 	__le16 reserved2;
-	/* Total structure size is 68 bytes */
-	u32 padding;
+	__le32 log_start_addr;
 } __packed;
 
 struct wl1271_fw_full_status {
@@ -472,6 +473,15 @@ struct wl1271 {
 	/* Network stack work  */
 	struct work_struct netstack_work;
 
+	/* FW log buffer */
+	u8 *fwlog;
+
+	/* Number of valid bytes in the FW log buffer */
+	ssize_t fwlog_size;
+
+	/* Sysfs FW log entry readers wait queue */
+	wait_queue_head_t fwlog_waitq;
+
 	/* Hardware recovery work */
 	struct work_struct recovery_work;
 
@@ -614,6 +624,7 @@ int wl1271_plt_start(struct wl1271 *wl);
 int wl1271_plt_stop(struct wl1271 *wl);
 int wl1271_recalc_rx_streaming(struct wl1271 *wl);
 void wl12xx_queue_recovery_work(struct wl1271 *wl);
+size_t wl12xx_copy_fwlog(struct wl1271 *wl, u8 *memblock, size_t maxlen);
 
 #define JOIN_TIMEOUT 5000 /* 5000 milliseconds to join */
 
@@ -655,4 +666,9 @@ void wl12xx_queue_recovery_work(struct wl1271 *wl);
  */
 #define WL12XX_QUIRK_LPD_MODE                   BIT(3)
 
+/* Older firmwares did not implement the FW logger over bus feature */
+#define WL12XX_QUIRK_FWLOG_NOT_IMPLEMENTED	BIT(4)
+
+#define WL12XX_HW_BLOCK_SIZE	256
+
 #endif