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@xxxxxxxxxx>
---
drivers/net/wireless/mediatek/mt76/mt76x02.h | 3 +
drivers/net/wireless/mediatek/mt76/mt76x02_regs.h | 5 +-
.../net/wireless/mediatek/mt76/mt76x02_usb_core.c | 70 ++++++++++++++++++++++
3 files changed, 77 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02.h b/drivers/net/wireless/mediatek/mt76/mt76x02.h
index e93f4840cace..9fa6e4fc221f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02.h
@@ -88,6 +88,9 @@ 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 7e0a5f364469..f1a3d41c8209 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);
--
1.9.3
