diff mbox series

[RFC,02/12] mt76x02: add hrtimer for pre TBTT for USB

Message ID 1551341013-24519-3-git-send-email-sgruszka@redhat.com (mailing list archive)
State RFC
Delegated to: Kalle Valo
Headers show
Series mt76x02: AP support for with PS | expand

Commit Message

Stanislaw Gruszka Feb. 28, 2019, 8:03 a.m. UTC 
Add timer and work for pre TBTT for USB devices. For now code
doesn't do anyting useful, just add hrtimer which synchronize
with hardware MT_TBTT_TIMER.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/net/wireless/mediatek/mt76/mt76x02.h  |  3 +
 .../net/wireless/mediatek/mt76/mt76x02_regs.h |  5 +-
 .../wireless/mediatek/mt76/mt76x02_usb_core.c | 70 +++++++++++++++++++
 3 files changed, 77 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02.h b/drivers/net/wireless/mediatek/mt76/mt76x02.h
index 78bc0211e479..edb1c140c487 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02.h
@@ -87,6 +87,9 @@  struct mt76x02_dev {
 	struct delayed_work mac_work;
 	struct delayed_work wdt_work;
 
+	struct hrtimer pre_tbtt_timer;
+	struct work_struct pre_tbtt_work;
+
 	u32 aggr_stats[32];
 
 	struct sk_buff *beacons[8];
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_regs.h b/drivers/net/wireless/mediatek/mt76/mt76x02_regs.h
index 7401cb94fb72..2ce05b543dff 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_regs.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_regs.h
@@ -356,7 +356,10 @@ 
 #define MT_BEACON_TIME_CFG_TSF_COMP	GENMASK(31, 24)
 
 #define MT_TBTT_SYNC_CFG		0x1118
-#define MT_TBTT_TIMER_CFG		0x1124
+#define MT_TSF_TIMER_DW0		0x111c
+#define MT_TSF_TIMER_DW1		0x1120
+#define MT_TBTT_TIMER			0x1124
+#define MT_TBTT_TIMER_VAL		GENMASK(16, 0)
 
 #define MT_INT_TIMER_CFG		0x1128
 #define MT_INT_TIMER_CFG_PRE_TBTT	GENMASK(15, 0)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
index 833ca97d07fc..051fa68a85d5 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
@@ -105,8 +105,78 @@  int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
 }
 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
 
+/* Trigger pre-TBTT event 8 ms before TBTT */
+#define PRE_TBTT_USEC 8000
+static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
+{
+	u64 time;
+	u32 tbtt;
+
+	/* Get remaining TBTT in usec */
+	tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
+	tbtt *= 32;
+
+	if (tbtt <= PRE_TBTT_USEC) {
+		queue_work(system_highpri_wq, &dev->pre_tbtt_work);
+		return;
+	}
+
+	time = (tbtt - PRE_TBTT_USEC) * 1000ull;
+	hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
+}
+
+static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
+{
+	u32 tbtt, dw0, dw1;
+	u64 tsf, time;
+
+	/* Get remaining TBTT in usec */
+	tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
+	tbtt *= 32;
+
+	dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
+	dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
+	tsf = (u64)dw0 << 32 | dw1;
+	dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
+
+	/* Convert beacon interval in TU (1024 usec) to nsec */
+	time = ((1000000000ull * dev->beacon_int) >> 10);
+
+	/* Adjust time to trigger hrtimer 8ms before TBTT */
+	if (tbtt < PRE_TBTT_USEC)
+		time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
+	else
+		time += (tbtt - PRE_TBTT_USEC) * 1000ull;
+
+	hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
+}
+
+static void mt76x02u_pre_tbtt_work(struct work_struct *work)
+{
+	struct mt76x02_dev *dev =
+		container_of(work, struct mt76x02_dev, pre_tbtt_work);
+
+	if (!dev->beacon_mask)
+		return;
+	mt76x02u_restart_pre_tbtt_timer(dev);
+}
+
+static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
+{
+	struct mt76x02_dev *dev =
+	    container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
+
+	queue_work(system_highpri_wq, &dev->pre_tbtt_work);
+
+	return HRTIMER_NORESTART;
+}
+
 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
 {
+	hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
+	INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
+
 	mt76x02_init_beacon_config(dev);
 }
 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);