Until there's a full MCI implementation - just implement a placeholder

MCI bluetooth coexistence method for WB222.

The rest of MCI requires a bunch more work, including adding a DMA buffer
for the MCI hardware to bounce messages in/out of and handling MCI
interrupts.  But the more important part here is telling the HAL
the btcoex is enabled and MCI is in use so it configures the correct
initial bluetooth parameters in the wireless NIC and configures
things like bluetooth traffic weights and such.

So, this at least gets the HAL to do some of the right things in
configuring the inital bluetooth coexistence stuff, but doesn't
actually do full btcoex.  That'll take.. some effort.

Tested:

* AR9462 (WB222), STA mode

1 files changed, 68 insertions, 0 deletions

diff --git a/sys/dev/ath/if_ath_btcoex.c b/sys/dev/ath/if_ath_btcoex.c
index 9d77622..b78f866 100644
--- a/sys/dev/ath/if_ath_btcoex.c
+++ b/sys/dev/ath/if_ath_btcoex.c
@@ -188,6 +188,72 @@ ath_btcoex_cfg_wb225(struct ath_softc *sc)
 	return (0);
 }
 
+/*
+ * Initial AR9462 / (WB222) bluetooth coexistence settings,
+ * just for experimentation.
+ *
+ * Return 0 for OK; errno for error.
+ */
+static int
+ath_btcoex_cfg_wb222(struct ath_softc *sc)
+{
+	HAL_BT_COEX_INFO btinfo;
+	HAL_BT_COEX_CONFIG btconfig;
+	struct ath_hal *ah = sc->sc_ah;
+
+	if (! ath_hal_btcoex_supported(ah))
+		return (EINVAL);
+
+	bzero(&btinfo, sizeof(btinfo));
+	bzero(&btconfig, sizeof(btconfig));
+
+	device_printf(sc->sc_dev, "Enabling WB222 BTCOEX\n");
+
+	btinfo.bt_module = HAL_BT_MODULE_JANUS;	/* XXX not used? */
+	btinfo.bt_coex_config = HAL_BT_COEX_CFG_MCI;
+
+	/*
+	 * MCI uses a completely different interface to speak
+	 * to the bluetooth module - it's a command based
+	 * thing over a serial line, rather than
+	 * state pins to/from the bluetooth module.
+	 *
+	 * So, the GPIO configuration, polarity, etc
+	 * doesn't matter on MCI devices; it's just
+	 * completely ignored by the HAL.
+	 */
+	btinfo.bt_gpio_bt_active = 4;
+	btinfo.bt_gpio_bt_priority = 8;
+	btinfo.bt_gpio_wlan_active = 5;
+
+	btinfo.bt_active_polarity = 1;	/* XXX not used */
+	btinfo.bt_single_ant = 0;	/* 2 antenna on WB222 */
+	btinfo.bt_isolation = 0;	/* in dB, not used */
+
+	ath_hal_btcoex_set_info(ah, &btinfo);
+
+	btconfig.bt_time_extend = 0;
+	btconfig.bt_txstate_extend = 1;	/* true */
+	btconfig.bt_txframe_extend = 1;	/* true */
+	btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
+	btconfig.bt_quiet_collision = 1;	/* true */
+	btconfig.bt_rxclear_polarity = 1;	/* true */
+	btconfig.bt_priority_time = 2;
+	btconfig.bt_first_slot_time = 5;
+	btconfig.bt_hold_rxclear = 1;	/* true */
+
+	ath_hal_btcoex_set_config(ah, &btconfig);
+
+	/*
+	 * Enable antenna diversity.
+	 */
+	ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);
+
+	return (0);
+}
+
+
+
 
 #if 0
 /*
@@ -243,6 +309,8 @@ ath_btcoex_attach(struct ath_softc *sc)
 
 	if (strncmp(profname, "wb195", 5) == 0) {
 		ret = ath_btcoex_cfg_wb195(sc);
+	} else if (strncmp(profname, "wb222", 5) == 0) {
+		ret = ath_btcoex_cfg_wb222(sc);
 	} else if (strncmp(profname, "wb225", 5) == 0) {
 		ret = ath_btcoex_cfg_wb225(sc);
 	} else {