From e85a96e48e3309c3009541b9b8dd7a27e23fd474 Mon Sep 17 00:00:00 2001 From: Horatiu Vultur Date: Mon, 31 Jan 2022 11:01:21 +0100 Subject: [PATCH] net: lan966x: Add support for ptp interrupts When doing 2-step timestamping the HW will generate an interrupt when it managed to timestamp a frame. It is the SW responsibility to read it from the FIFO. Signed-off-by: Horatiu Vultur Signed-off-by: David S. Miller --- .../net/ethernet/microchip/lan966x/lan966x_main.c | 11 ++ .../net/ethernet/microchip/lan966x/lan966x_main.h | 2 + .../net/ethernet/microchip/lan966x/lan966x_ptp.c | 117 +++++++++++++++++++++ 3 files changed, 130 insertions(+) diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c index 3c19763118ea..e62758bcb998 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c @@ -957,6 +957,17 @@ static int lan966x_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, err, "Unable to use ana irq"); } + lan966x->ptp_irq = platform_get_irq_byname(pdev, "ptp"); + if (lan966x->ptp_irq > 0) { + err = devm_request_threaded_irq(&pdev->dev, lan966x->ptp_irq, NULL, + lan966x_ptp_irq_handler, IRQF_ONESHOT, + "ptp irq", lan966x); + if (err) + return dev_err_probe(&pdev->dev, err, "Unable to use ptp irq"); + + lan966x->ptp = 1; + } + /* init switch */ lan966x_init(lan966x); lan966x_stats_init(lan966x); diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h index 03c6a4f34ae2..026474c609ea 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h @@ -131,6 +131,7 @@ struct lan966x { /* interrupts */ int xtr_irq; int ana_irq; + int ptp_irq; /* worqueue for fdb */ struct workqueue_struct *fdb_work; @@ -276,6 +277,7 @@ int lan966x_ptp_txtstamp_request(struct lan966x_port *port, struct sk_buff *skb); void lan966x_ptp_txtstamp_release(struct lan966x_port *port, struct sk_buff *skb); +irqreturn_t lan966x_ptp_irq_handler(int irq, void *args); static inline void __iomem *lan_addr(void __iomem *base[], int id, int tinst, int tcnt, diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c index 11c9f9d3aa5b..ae782778d6dd 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c @@ -204,6 +204,123 @@ void lan966x_ptp_txtstamp_release(struct lan966x_port *port, spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags); } +static void lan966x_get_hwtimestamp(struct lan966x *lan966x, + struct timespec64 *ts, + u32 nsec) +{ + /* Read current PTP time to get seconds */ + unsigned long flags; + u32 curr_nsec; + + spin_lock_irqsave(&lan966x->ptp_clock_lock, flags); + + lan_rmw(PTP_PIN_CFG_PIN_ACTION_SET(PTP_PIN_ACTION_SAVE) | + PTP_PIN_CFG_PIN_DOM_SET(LAN966X_PHC_PORT) | + PTP_PIN_CFG_PIN_SYNC_SET(0), + PTP_PIN_CFG_PIN_ACTION | + PTP_PIN_CFG_PIN_DOM | + PTP_PIN_CFG_PIN_SYNC, + lan966x, PTP_PIN_CFG(TOD_ACC_PIN)); + + ts->tv_sec = lan_rd(lan966x, PTP_TOD_SEC_LSB(TOD_ACC_PIN)); + curr_nsec = lan_rd(lan966x, PTP_TOD_NSEC(TOD_ACC_PIN)); + + ts->tv_nsec = nsec; + + /* Sec has incremented since the ts was registered */ + if (curr_nsec < nsec) + ts->tv_sec--; + + spin_unlock_irqrestore(&lan966x->ptp_clock_lock, flags); +} + +irqreturn_t lan966x_ptp_irq_handler(int irq, void *args) +{ + int budget = LAN966X_MAX_PTP_ID; + struct lan966x *lan966x = args; + + while (budget--) { + struct sk_buff *skb, *skb_tmp, *skb_match = NULL; + struct skb_shared_hwtstamps shhwtstamps; + struct lan966x_port *port; + struct timespec64 ts; + unsigned long flags; + u32 val, id, txport; + u32 delay; + + val = lan_rd(lan966x, PTP_TWOSTEP_CTRL); + + /* Check if a timestamp can be retrieved */ + if (!(val & PTP_TWOSTEP_CTRL_VLD)) + break; + + WARN_ON(val & PTP_TWOSTEP_CTRL_OVFL); + + if (!(val & PTP_TWOSTEP_CTRL_STAMP_TX)) + continue; + + /* Retrieve the ts Tx port */ + txport = PTP_TWOSTEP_CTRL_STAMP_PORT_GET(val); + + /* Retrieve its associated skb */ + port = lan966x->ports[txport]; + + /* Retrieve the delay */ + delay = lan_rd(lan966x, PTP_TWOSTEP_STAMP); + delay = PTP_TWOSTEP_STAMP_STAMP_NSEC_GET(delay); + + /* Get next timestamp from fifo, which needs to be the + * rx timestamp which represents the id of the frame + */ + lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1), + PTP_TWOSTEP_CTRL_NXT, + lan966x, PTP_TWOSTEP_CTRL); + + val = lan_rd(lan966x, PTP_TWOSTEP_CTRL); + + /* Check if a timestamp can be retried */ + if (!(val & PTP_TWOSTEP_CTRL_VLD)) + break; + + /* Read RX timestamping to get the ID */ + id = lan_rd(lan966x, PTP_TWOSTEP_STAMP); + + spin_lock_irqsave(&port->tx_skbs.lock, flags); + skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) { + if (LAN966X_SKB_CB(skb)->ts_id != id) + continue; + + __skb_unlink(skb, &port->tx_skbs); + skb_match = skb; + break; + } + spin_unlock_irqrestore(&port->tx_skbs.lock, flags); + + /* Next ts */ + lan_rmw(PTP_TWOSTEP_CTRL_NXT_SET(1), + PTP_TWOSTEP_CTRL_NXT, + lan966x, PTP_TWOSTEP_CTRL); + + if (WARN_ON(!skb_match)) + continue; + + spin_lock(&lan966x->ptp_ts_id_lock); + lan966x->ptp_skbs--; + spin_unlock(&lan966x->ptp_ts_id_lock); + + /* Get the h/w timestamp */ + lan966x_get_hwtimestamp(lan966x, &ts, delay); + + /* Set the timestamp into the skb */ + shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec); + skb_tstamp_tx(skb_match, &shhwtstamps); + + dev_kfree_skb_any(skb_match); + } + + return IRQ_HANDLED; +} + static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) { struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info); -- 2.11.0