1 files changed, 68 insertions, 118 deletions

diff --git a/drivers/net/ethernet/cadence/macb_ptp.c b/drivers/net/ethernet/cadence/macb_ptp.c
index a6dc47edc4cf..c9e77819196e 100644
--- a/drivers/net/ethernet/cadence/macb_ptp.c
+++ b/drivers/net/ethernet/cadence/macb_ptp.c
@@ -1,22 +1,11 @@
-/**
+// SPDX-License-Identifier: GPL-2.0-only
+/*
  * 1588 PTP support for Cadence GEM device.
  *
- * Copyright (C) 2017 Cadence Design Systems - http://www.cadence.com
+ * Copyright (C) 2017 Cadence Design Systems - https://www.cadence.com
  *
  * Authors: Rafal Ozieblo <rafalo@cadence.com>
  *          Bartosz Folta <bfolta@cadence.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2  of
- * the License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
 #include <linux/types.h>
@@ -39,17 +28,20 @@
 static struct macb_dma_desc_ptp *macb_ptp_desc(struct macb *bp,
 					       struct macb_dma_desc *desc)
 {
-	if (bp->hw_dma_cap == HW_DMA_CAP_PTP)
-		return (struct macb_dma_desc_ptp *)
-				((u8 *)desc + sizeof(struct macb_dma_desc));
-	if (bp->hw_dma_cap == HW_DMA_CAP_64B_PTP)
+	if (!macb_dma_ptp(bp))
+		return NULL;
+
+	if (macb_dma64(bp))
 		return (struct macb_dma_desc_ptp *)
 				((u8 *)desc + sizeof(struct macb_dma_desc)
 				+ sizeof(struct macb_dma_desc_64));
-	return NULL;
+	else
+		return (struct macb_dma_desc_ptp *)
+				((u8 *)desc + sizeof(struct macb_dma_desc));
 }
 
-static int gem_tsu_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
+static int gem_tsu_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts,
+			    struct ptp_system_timestamp *sts)
 {
 	struct macb *bp = container_of(ptp, struct macb, ptp_clock_info);
 	unsigned long flags;
@@ -57,7 +49,9 @@ static int gem_tsu_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
 	u32 secl, sech;
 
 	spin_lock_irqsave(&bp->tsu_clk_lock, flags);
+	ptp_read_system_prets(sts);
 	first = gem_readl(bp, TN);
+	ptp_read_system_postts(sts);
 	secl = gem_readl(bp, TSL);
 	sech = gem_readl(bp, TSH);
 	second = gem_readl(bp, TN);
@@ -67,7 +61,9 @@ static int gem_tsu_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
 		/* if so, use later read & re-read seconds
 		 * (assume all done within 1s)
 		 */
+		ptp_read_system_prets(sts);
 		ts->tv_nsec = gem_readl(bp, TN);
+		ptp_read_system_postts(sts);
 		secl = gem_readl(bp, TSL);
 		sech = gem_readl(bp, TSH);
 	} else {
@@ -115,7 +111,10 @@ static int gem_tsu_incr_set(struct macb *bp, struct tsu_incr *incr_spec)
 	 * to take effect.
 	 */
 	spin_lock_irqsave(&bp->tsu_clk_lock, flags);
-	gem_writel(bp, TISUBN, GEM_BF(SUBNSINCR, incr_spec->sub_ns));
+	/* RegBit[15:0] = Subns[23:8]; RegBit[31:24] = Subns[7:0] */
+	gem_writel(bp, TISUBN, GEM_BF(SUBNSINCRL, incr_spec->sub_ns) |
+		   GEM_BF(SUBNSINCRH, (incr_spec->sub_ns >>
+			  GEM_SUBNSINCRL_SIZE)));
 	gem_writel(bp, TI, GEM_BF(NSINCR, incr_spec->ns));
 	spin_unlock_irqrestore(&bp->tsu_clk_lock, flags);
 
@@ -146,7 +145,7 @@ static int gem_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 	 * (temp / USEC_PER_SEC) + 0.5
 	 */
 	adj += (USEC_PER_SEC >> 1);
-	adj >>= GEM_SUBNSINCR_SIZE; /* remove fractions */
+	adj >>= PPM_FRACTION; /* remove fractions */
 	adj = div_u64(adj, USEC_PER_SEC);
 	adj = neg_adj ? (word - adj) : (word + adj);
 
@@ -169,7 +168,7 @@ static int gem_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 	}
 
 	if (delta > TSU_NSEC_MAX_VAL) {
-		gem_tsu_get_time(&bp->ptp_clock_info, &now);
+		gem_tsu_get_time(&bp->ptp_clock_info, &now, NULL);
 		now = timespec64_add(now, then);
 
 		gem_tsu_set_time(&bp->ptp_clock_info,
@@ -200,7 +199,7 @@ static const struct ptp_clock_info gem_ptp_caps_template = {
 	.pps		= 1,
 	.adjfine	= gem_ptp_adjfine,
 	.adjtime	= gem_ptp_adjtime,
-	.gettime64	= gem_tsu_get_time,
+	.gettimex64	= gem_tsu_get_time,
 	.settime64	= gem_tsu_set_time,
 	.enable		= gem_ptp_enable,
 };
@@ -259,7 +258,9 @@ static int gem_hw_timestamp(struct macb *bp, u32 dma_desc_ts_1,
 	 * The timestamp only contains lower few bits of seconds,
 	 * so add value from 1588 timer
 	 */
-	gem_tsu_get_time(&bp->ptp_clock_info, &tsu);
+	gem_tsu_get_time(&bp->ptp_clock_info, &tsu, NULL);
+
+	ts->tv_sec |= ((~GEM_DMA_SEC_MASK) & tsu.tv_sec);
 
 	/* If the top bit is set in the timestamp,
 	 * but not in 1588 timer, it has rolled over,
@@ -269,8 +270,6 @@ static int gem_hw_timestamp(struct macb *bp, u32 dma_desc_ts_1,
 	    !(tsu.tv_sec & (GEM_DMA_SEC_TOP >> 1)))
 		ts->tv_sec -= GEM_DMA_SEC_TOP;
 
-	ts->tv_sec += ((~GEM_DMA_SEC_MASK) & tsu.tv_sec);
-
 	return 0;
 }
 
@@ -283,82 +282,51 @@ void gem_ptp_rxstamp(struct macb *bp, struct sk_buff *skb,
 
 	if (GEM_BFEXT(DMA_RXVALID, desc->addr)) {
 		desc_ptp = macb_ptp_desc(bp, desc);
+		/* Unlikely but check */
+		if (!desc_ptp) {
+			dev_warn_ratelimited(&bp->pdev->dev,
+					     "Timestamp not supported in BD\n");
+			return;
+		}
 		gem_hw_timestamp(bp, desc_ptp->ts_1, desc_ptp->ts_2, &ts);
 		memset(shhwtstamps, 0, sizeof(struct skb_shared_hwtstamps));
 		shhwtstamps->hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
 	}
 }
 
-static void gem_tstamp_tx(struct macb *bp, struct sk_buff *skb,
-			  struct macb_dma_desc_ptp *desc_ptp)
+void gem_ptp_txstamp(struct macb *bp, struct sk_buff *skb,
+		     struct macb_dma_desc *desc)
 {
 	struct skb_shared_hwtstamps shhwtstamps;
-	struct timespec64 ts;
-
-	gem_hw_timestamp(bp, desc_ptp->ts_1, desc_ptp->ts_2, &ts);
-	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
-	shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
-	skb_tstamp_tx(skb, &shhwtstamps);
-}
-
-int gem_ptp_txstamp(struct macb_queue *queue, struct sk_buff *skb,
-		    struct macb_dma_desc *desc)
-{
-	unsigned long tail = READ_ONCE(queue->tx_ts_tail);
-	unsigned long head = queue->tx_ts_head;
 	struct macb_dma_desc_ptp *desc_ptp;
-	struct gem_tx_ts *tx_timestamp;
+	struct timespec64 ts;
 
-	if (!GEM_BFEXT(DMA_TXVALID, desc->ctrl))
-		return -EINVAL;
+	if (!GEM_BFEXT(DMA_TXVALID, desc->ctrl)) {
+		dev_warn_ratelimited(&bp->pdev->dev,
+				     "Timestamp not set in TX BD as expected\n");
+		return;
+	}
 
-	if (CIRC_SPACE(head, tail, PTP_TS_BUFFER_SIZE) == 0)
-		return -ENOMEM;
+	desc_ptp = macb_ptp_desc(bp, desc);
+	/* Unlikely but check */
+	if (!desc_ptp) {
+		dev_warn_ratelimited(&bp->pdev->dev,
+				     "Timestamp not supported in BD\n");
+		return;
+	}
 
-	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
-	desc_ptp = macb_ptp_desc(queue->bp, desc);
-	tx_timestamp = &queue->tx_timestamps[head];
-	tx_timestamp->skb = skb;
 	/* ensure ts_1/ts_2 is loaded after ctrl (TX_USED check) */
 	dma_rmb();
-	tx_timestamp->desc_ptp.ts_1 = desc_ptp->ts_1;
-	tx_timestamp->desc_ptp.ts_2 = desc_ptp->ts_2;
-	/* move head */
-	smp_store_release(&queue->tx_ts_head,
-			  (head + 1) & (PTP_TS_BUFFER_SIZE - 1));
-
-	schedule_work(&queue->tx_ts_task);
-	return 0;
-}
+	gem_hw_timestamp(bp, desc_ptp->ts_1, desc_ptp->ts_2, &ts);
 
-static void gem_tx_timestamp_flush(struct work_struct *work)
-{
-	struct macb_queue *queue =
-			container_of(work, struct macb_queue, tx_ts_task);
-	unsigned long head, tail;
-	struct gem_tx_ts *tx_ts;
-
-	/* take current head */
-	head = smp_load_acquire(&queue->tx_ts_head);
-	tail = queue->tx_ts_tail;
-
-	while (CIRC_CNT(head, tail, PTP_TS_BUFFER_SIZE)) {
-		tx_ts = &queue->tx_timestamps[tail];
-		gem_tstamp_tx(queue->bp, tx_ts->skb, &tx_ts->desc_ptp);
-		/* cleanup */
-		dev_kfree_skb_any(tx_ts->skb);
-		/* remove old tail */
-		smp_store_release(&queue->tx_ts_tail,
-				  (tail + 1) & (PTP_TS_BUFFER_SIZE - 1));
-		tail = queue->tx_ts_tail;
-	}
+	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+	shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
+	skb_tstamp_tx(skb, &shhwtstamps);
 }
 
 void gem_ptp_init(struct net_device *dev)
 {
 	struct macb *bp = netdev_priv(dev);
-	struct macb_queue *queue;
-	unsigned int q;
 
 	bp->ptp_clock_info = gem_ptp_caps_template;
 
@@ -378,11 +346,6 @@ void gem_ptp_init(struct net_device *dev)
 	}
 
 	spin_lock_init(&bp->tsu_clk_lock);
-	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
-		queue->tx_ts_head = 0;
-		queue->tx_ts_tail = 0;
-		INIT_WORK(&queue->tx_ts_task, gem_tx_timestamp_flush);
-	}
 
 	gem_ptp_init_tsu(bp);
 
@@ -413,22 +376,19 @@ static int gem_ptp_set_ts_mode(struct macb *bp,
 	return 0;
 }
 
-int gem_get_hwtst(struct net_device *dev, struct ifreq *rq)
+int gem_get_hwtst(struct net_device *dev,
+		  struct kernel_hwtstamp_config *tstamp_config)
 {
-	struct hwtstamp_config *tstamp_config;
 	struct macb *bp = netdev_priv(dev);
 
-	tstamp_config = &bp->tstamp_config;
-	if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0)
+	*tstamp_config = bp->tstamp_config;
+	if (!macb_dma_ptp(bp))
 		return -EOPNOTSUPP;
 
-	if (copy_to_user(rq->ifr_data, tstamp_config, sizeof(*tstamp_config)))
-		return -EFAULT;
-	else
-		return 0;
+	return 0;
 }
 
-static int gem_ptp_set_one_step_sync(struct macb *bp, u8 enable)
+static void gem_ptp_set_one_step_sync(struct macb *bp, u8 enable)
 {
 	u32 reg_val;
 
@@ -438,38 +398,29 @@ static int gem_ptp_set_one_step_sync(struct macb *bp, u8 enable)
 		macb_writel(bp, NCR, reg_val | MACB_BIT(OSSMODE));
 	else
 		macb_writel(bp, NCR, reg_val & ~MACB_BIT(OSSMODE));
-
-	return 0;
 }
 
-int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd)
+int gem_set_hwtst(struct net_device *dev,
+		  struct kernel_hwtstamp_config *tstamp_config,
+		  struct netlink_ext_ack *extack)
 {
 	enum macb_bd_control tx_bd_control = TSTAMP_DISABLED;
 	enum macb_bd_control rx_bd_control = TSTAMP_DISABLED;
-	struct hwtstamp_config *tstamp_config;
 	struct macb *bp = netdev_priv(dev);
 	u32 regval;
 
-	tstamp_config = &bp->tstamp_config;
-	if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0)
+	if (!macb_dma_ptp(bp))
 		return -EOPNOTSUPP;
 
-	if (copy_from_user(tstamp_config, ifr->ifr_data,
-			   sizeof(*tstamp_config)))
-		return -EFAULT;
-
-	/* reserved for future extensions */
-	if (tstamp_config->flags)
-		return -EINVAL;
-
 	switch (tstamp_config->tx_type) {
 	case HWTSTAMP_TX_OFF:
 		break;
 	case HWTSTAMP_TX_ONESTEP_SYNC:
-		if (gem_ptp_set_one_step_sync(bp, 1) != 0)
-			return -ERANGE;
-		/* fall through */
+		gem_ptp_set_one_step_sync(bp, 1);
+		tx_bd_control = TSTAMP_ALL_FRAMES;
+		break;
 	case HWTSTAMP_TX_ON:
+		gem_ptp_set_one_step_sync(bp, 0);
 		tx_bd_control = TSTAMP_ALL_FRAMES;
 		break;
 	default:
@@ -507,12 +458,11 @@ int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd)
 		return -ERANGE;
 	}
 
+	bp->tstamp_config = *tstamp_config;
+
 	if (gem_ptp_set_ts_mode(bp, tx_bd_control, rx_bd_control) != 0)
 		return -ERANGE;
 
-	if (copy_to_user(ifr->ifr_data, tstamp_config, sizeof(*tstamp_config)))
-		return -EFAULT;
-	else
-		return 0;
+	return 0;
 }