rt2x00: Use pretbtt irq for fetching beacons on rt2800pci

Updating the beacon on pre tbtt instead of beacondone allows much lower
latency in regard to TIM updates. Hence, use the pre tbtt interrupt for
updating the beacon in rt2800pci (older devices don't provide a pre tbtt
interrupt).

Also, add a new driver flag to indicate if a driver has pre tbtt support
or not and implement the according behavior in rt2x00lib.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800.h b/drivers/net/wireless/rt2x00/rt2800.h
index edd3734b8b32..dc93e14f7ab7 100644
--- a/drivers/net/wireless/rt2x00/rt2800.h
+++ b/drivers/net/wireless/rt2x00/rt2800.h
@@ -719,14 +719,20 @@
 #define TBTT_TIMER                      0x1124
 
 /*
- * INT_TIMER_CFG:
+ * INT_TIMER_CFG: timer configuration
+ * PRE_TBTT_TIMER: leadtime to tbtt for pretbtt interrupt in units of 1/16 TU
+ * GP_TIMER: period of general purpose timer in units of 1/16 TU
  */
 #define INT_TIMER_CFG                   0x1128
+#define INT_TIMER_CFG_PRE_TBTT_TIMER    FIELD32(0x0000ffff)
+#define INT_TIMER_CFG_GP_TIMER          FIELD32(0xffff0000)
 
 /*
  * INT_TIMER_EN: GP-timer and pre-tbtt Int enable
  */
 #define INT_TIMER_EN                    0x112c
+#define INT_TIMER_EN_PRE_TBTT_TIMER     FIELD32(0x00000001)
+#define INT_TIMER_EN_GP_TIMER           FIELD32(0x00000002)
 
 /*
  * CH_IDLE_STA: channel idle time