Merge branch 'DSA-Felix-PTP'

Yangbo Lu says:

====================
Support PTP clock and hardware timestamping for DSA Felix driver

This patch-set is to support PTP clock and hardware timestamping
for DSA Felix driver. Some functions in ocelot.c/ocelot_board.c
driver were reworked/exported, so that DSA Felix driver was able
to reuse them as much as possible.

On TX path, timestamping works on packet which requires timestamp.
The injection header will be configured accordingly, and skb clone
requires timestamp will be added into a list. The TX timestamp
is final handled in threaded interrupt handler when PTP timestamp
FIFO is ready.
On RX path, timestamping is always working. The RX timestamp could
be got from extraction header.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 222 insertions, 82 deletions

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index ce3637b504dd..167e41549cdd 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -3,6 +3,7 @@
  */
 #include <uapi/linux/if_bridge.h>
 #include <soc/mscc/ocelot.h>
+#include <linux/packing.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/of.h>
@@ -303,6 +304,62 @@ static void felix_teardown(struct dsa_switch *ds)
 	ocelot_deinit(ocelot);
 }
 
+static int felix_hwtstamp_get(struct dsa_switch *ds, int port,
+			      struct ifreq *ifr)
+{
+	struct ocelot *ocelot = ds->priv;
+
+	return ocelot_hwstamp_get(ocelot, port, ifr);
+}
+
+static int felix_hwtstamp_set(struct dsa_switch *ds, int port,
+			      struct ifreq *ifr)
+{
+	struct ocelot *ocelot = ds->priv;
+
+	return ocelot_hwstamp_set(ocelot, port, ifr);
+}
+
+static bool felix_rxtstamp(struct dsa_switch *ds, int port,
+			   struct sk_buff *skb, unsigned int type)
+{
+	struct skb_shared_hwtstamps *shhwtstamps;
+	struct ocelot *ocelot = ds->priv;
+	u8 *extraction = skb->data - ETH_HLEN - OCELOT_TAG_LEN;
+	u32 tstamp_lo, tstamp_hi;
+	struct timespec64 ts;
+	u64 tstamp, val;
+
+	ocelot_ptp_gettime64(&ocelot->ptp_info, &ts);
+	tstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
+
+	packing(extraction, &val,  116, 85, OCELOT_TAG_LEN, UNPACK, 0);
+	tstamp_lo = (u32)val;
+
+	tstamp_hi = tstamp >> 32;
+	if ((tstamp & 0xffffffff) < tstamp_lo)
+		tstamp_hi--;
+
+	tstamp = ((u64)tstamp_hi << 32) | tstamp_lo;
+
+	shhwtstamps = skb_hwtstamps(skb);
+	memset(shhwtstamps, 0, sizeof(struct skb_shared_hwtstamps));
+	shhwtstamps->hwtstamp = tstamp;
+	return false;
+}
+
+bool felix_txtstamp(struct dsa_switch *ds, int port,
+		    struct sk_buff *clone, unsigned int type)
+{
+	struct ocelot *ocelot = ds->priv;
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+
+	if (!ocelot_port_add_txtstamp_skb(ocelot_port, clone))
+		return true;
+
+	return false;
+}
+
 static const struct dsa_switch_ops felix_switch_ops = {
 	.get_tag_protocol	= felix_get_tag_protocol,
 	.setup			= felix_setup,
@@ -325,12 +382,33 @@ static const struct dsa_switch_ops felix_switch_ops = {
 	.port_vlan_filtering	= felix_vlan_filtering,
 	.port_vlan_add		= felix_vlan_add,
 	.port_vlan_del		= felix_vlan_del,
+	.port_hwtstamp_get	= felix_hwtstamp_get,
+	.port_hwtstamp_set	= felix_hwtstamp_set,
+	.port_rxtstamp		= felix_rxtstamp,
+	.port_txtstamp		= felix_txtstamp,
 };
 
 static struct felix_info *felix_instance_tbl[] = {
 	[FELIX_INSTANCE_VSC9959] = &felix_info_vsc9959,
 };
 
+static irqreturn_t felix_irq_handler(int irq, void *data)
+{
+	struct ocelot *ocelot = (struct ocelot *)data;
+
+	/* The INTB interrupt is used for both PTP TX timestamp interrupt
+	 * and preemption status change interrupt on each port.
+	 *
+	 * - Get txtstamp if have
+	 * - TODO: handle preemption. Without handling it, driver may get
+	 *   interrupt storm.
+	 */
+
+	ocelot_get_txtstamp(ocelot);
+
+	return IRQ_HANDLED;
+}
+
 static int felix_pci_probe(struct pci_dev *pdev,
 			   const struct pci_device_id *id)
 {
@@ -372,6 +450,16 @@ static int felix_pci_probe(struct pci_dev *pdev,
 
 	pci_set_master(pdev);
 
+	err = devm_request_threaded_irq(&pdev->dev, pdev->irq, NULL,
+					&felix_irq_handler, IRQF_ONESHOT,
+					"felix-intb", ocelot);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to request irq\n");
+		goto err_alloc_irq;
+	}
+
+	ocelot->ptp = 1;
+
 	ds = kzalloc(sizeof(struct dsa_switch), GFP_KERNEL);
 	if (!ds) {
 		err = -ENOMEM;
@@ -396,6 +484,7 @@ static int felix_pci_probe(struct pci_dev *pdev,
 err_register_ds:
 	kfree(ds);
 err_alloc_ds:
+err_alloc_irq:
 err_alloc_felix:
 	kfree(felix);
 err_dma:
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index d67bd14a48e0..b9758b0d18c7 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -282,6 +282,16 @@ static const u32 vsc9959_sys_regmap[] = {
 	REG_RESERVED(SYS_CM_DATA),
 };
 
+static const u32 vsc9959_ptp_regmap[] = {
+	REG(PTP_PIN_CFG,                   0x000000),
+	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
+	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
+	REG(PTP_PIN_TOD_NSEC,              0x00000c),
+	REG(PTP_CFG_MISC,                  0x0000a0),
+	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
+	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),
+};
+
 static const u32 vsc9959_gcb_regmap[] = {
 	REG(GCB_SOFT_RST,			0x000004),
 };
@@ -293,6 +303,7 @@ static const u32 *vsc9959_regmap[] = {
 	[REW]	= vsc9959_rew_regmap,
 	[SYS]	= vsc9959_sys_regmap,
 	[S2]	= vsc9959_s2_regmap,
+	[PTP]	= vsc9959_ptp_regmap,
 	[GCB]	= vsc9959_gcb_regmap,
 };
 
@@ -330,6 +341,11 @@ static struct resource vsc9959_target_io_res[] = {
 		.end	= 0x00603ff,
 		.name	= "s2",
 	},
+	[PTP] = {
+		.start	= 0x0090000,
+		.end	= 0x00900cb,
+		.name	= "ptp",
+	},
 	[GCB] = {
 		.start	= 0x0070000,
 		.end	= 0x00701ff,
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 90c46ba763d7..0e96ffab3b05 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -575,6 +575,32 @@ static int ocelot_gen_ifh(u32 *ifh, struct frame_info *info)
 	return 0;
 }
 
+int ocelot_port_add_txtstamp_skb(struct ocelot_port *ocelot_port,
+				 struct sk_buff *skb)
+{
+	struct skb_shared_info *shinfo = skb_shinfo(skb);
+	struct ocelot *ocelot = ocelot_port->ocelot;
+
+	if (ocelot->ptp && shinfo->tx_flags & SKBTX_HW_TSTAMP &&
+	    ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
+		struct ocelot_skb *oskb =
+			kzalloc(sizeof(struct ocelot_skb), GFP_ATOMIC);
+
+		if (unlikely(!oskb))
+			return -ENOMEM;
+
+		shinfo->tx_flags |= SKBTX_IN_PROGRESS;
+
+		oskb->skb = skb;
+		oskb->id = ocelot_port->ts_id % 4;
+
+		list_add_tail(&oskb->head, &ocelot_port->skbs);
+		return 0;
+	}
+	return -ENODATA;
+}
+EXPORT_SYMBOL(ocelot_port_add_txtstamp_skb);
+
 static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ocelot_port_private *priv = netdev_priv(dev);
@@ -637,31 +663,17 @@ static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
 	dev->stats.tx_packets++;
 	dev->stats.tx_bytes += skb->len;
 
-	if (ocelot->ptp && shinfo->tx_flags & SKBTX_HW_TSTAMP &&
-	    ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
-		struct ocelot_skb *oskb =
-			kzalloc(sizeof(struct ocelot_skb), GFP_ATOMIC);
-
-		if (unlikely(!oskb))
-			goto out;
-
-		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
-
-		oskb->skb = skb;
-		oskb->id = ocelot_port->ts_id % 4;
+	if (!ocelot_port_add_txtstamp_skb(ocelot_port, skb)) {
 		ocelot_port->ts_id++;
-
-		list_add_tail(&oskb->head, &ocelot_port->skbs);
-
 		return NETDEV_TX_OK;
 	}
 
-out:
 	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }
 
-void ocelot_get_hwtimestamp(struct ocelot *ocelot, struct timespec64 *ts)
+static void ocelot_get_hwtimestamp(struct ocelot *ocelot,
+				   struct timespec64 *ts)
 {
 	unsigned long flags;
 	u32 val;
@@ -686,7 +698,64 @@ void ocelot_get_hwtimestamp(struct ocelot *ocelot, struct timespec64 *ts)
 
 	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
 }
-EXPORT_SYMBOL(ocelot_get_hwtimestamp);
+
+void ocelot_get_txtstamp(struct ocelot *ocelot)
+{
+	int budget = OCELOT_PTP_QUEUE_SZ;
+
+	while (budget--) {
+		struct skb_shared_hwtstamps shhwtstamps;
+		struct list_head *pos, *tmp;
+		struct sk_buff *skb = NULL;
+		struct ocelot_skb *entry;
+		struct ocelot_port *port;
+		struct timespec64 ts;
+		u32 val, id, txport;
+
+		val = ocelot_read(ocelot, SYS_PTP_STATUS);
+
+		/* Check if a timestamp can be retrieved */
+		if (!(val & SYS_PTP_STATUS_PTP_MESS_VLD))
+			break;
+
+		WARN_ON(val & SYS_PTP_STATUS_PTP_OVFL);
+
+		/* Retrieve the ts ID and Tx port */
+		id = SYS_PTP_STATUS_PTP_MESS_ID_X(val);
+		txport = SYS_PTP_STATUS_PTP_MESS_TXPORT_X(val);
+
+		/* Retrieve its associated skb */
+		port = ocelot->ports[txport];
+
+		list_for_each_safe(pos, tmp, &port->skbs) {
+			entry = list_entry(pos, struct ocelot_skb, head);
+			if (entry->id != id)
+				continue;
+
+			skb = entry->skb;
+
+			list_del(pos);
+			kfree(entry);
+		}
+
+		/* Next ts */
+		ocelot_write(ocelot, SYS_PTP_NXT_PTP_NXT, SYS_PTP_NXT);
+
+		if (unlikely(!skb))
+			continue;
+
+		/* Get the h/w timestamp */
+		ocelot_get_hwtimestamp(ocelot, &ts);
+
+		/* Set the timestamp into the skb */
+		memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+		shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
+		skb_tstamp_tx(skb, &shhwtstamps);
+
+		dev_kfree_skb_any(skb);
+	}
+}
+EXPORT_SYMBOL(ocelot_get_txtstamp);
 
 static int ocelot_mc_unsync(struct net_device *dev, const unsigned char *addr)
 {
@@ -1049,15 +1118,14 @@ static int ocelot_get_port_parent_id(struct net_device *dev,
 	return 0;
 }
 
-static int ocelot_hwstamp_get(struct ocelot *ocelot, int port,
-			      struct ifreq *ifr)
+int ocelot_hwstamp_get(struct ocelot *ocelot, int port, struct ifreq *ifr)
 {
 	return copy_to_user(ifr->ifr_data, &ocelot->hwtstamp_config,
 			    sizeof(ocelot->hwtstamp_config)) ? -EFAULT : 0;
 }
+EXPORT_SYMBOL(ocelot_hwstamp_get);
 
-static int ocelot_hwstamp_set(struct ocelot *ocelot, int port,
-			      struct ifreq *ifr)
+int ocelot_hwstamp_set(struct ocelot *ocelot, int port, struct ifreq *ifr)
 {
 	struct ocelot_port *ocelot_port = ocelot->ports[port];
 	struct hwtstamp_config cfg;
@@ -1120,6 +1188,7 @@ static int ocelot_hwstamp_set(struct ocelot *ocelot, int port,
 
 	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
 }
+EXPORT_SYMBOL(ocelot_hwstamp_set);
 
 static int ocelot_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
index 32fef4f495aa..c259114c48fd 100644
--- a/drivers/net/ethernet/mscc/ocelot.h
+++ b/drivers/net/ethernet/mscc/ocelot.h
@@ -74,12 +74,6 @@ struct ocelot_port_private {
 	struct ocelot_port_tc tc;
 };
 
-struct ocelot_skb {
-	struct list_head head;
-	struct sk_buff *skb;
-	u8 id;
-};
-
 u32 ocelot_port_readl(struct ocelot_port *port, u32 reg);
 void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg);
 
diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
index 5541ec26f953..2da8eee27e98 100644
--- a/drivers/net/ethernet/mscc/ocelot_board.c
+++ b/drivers/net/ethernet/mscc/ocelot_board.c
@@ -190,60 +190,9 @@ static irqreturn_t ocelot_xtr_irq_handler(int irq, void *arg)
 
 static irqreturn_t ocelot_ptp_rdy_irq_handler(int irq, void *arg)
 {
-	int budget = OCELOT_PTP_QUEUE_SZ;
 	struct ocelot *ocelot = arg;
 
-	while (budget--) {
-		struct skb_shared_hwtstamps shhwtstamps;
-		struct list_head *pos, *tmp;
-		struct sk_buff *skb = NULL;
-		struct ocelot_skb *entry;
-		struct ocelot_port *port;
-		struct timespec64 ts;
-		u32 val, id, txport;
-
-		val = ocelot_read(ocelot, SYS_PTP_STATUS);
-
-		/* Check if a timestamp can be retrieved */
-		if (!(val & SYS_PTP_STATUS_PTP_MESS_VLD))
-			break;
-
-		WARN_ON(val & SYS_PTP_STATUS_PTP_OVFL);
-
-		/* Retrieve the ts ID and Tx port */
-		id = SYS_PTP_STATUS_PTP_MESS_ID_X(val);
-		txport = SYS_PTP_STATUS_PTP_MESS_TXPORT_X(val);
-
-		/* Retrieve its associated skb */
-		port = ocelot->ports[txport];
-
-		list_for_each_safe(pos, tmp, &port->skbs) {
-			entry = list_entry(pos, struct ocelot_skb, head);
-			if (entry->id != id)
-				continue;
-
-			skb = entry->skb;
-
-			list_del(pos);
-			kfree(entry);
-		}
-
-		/* Next ts */
-		ocelot_write(ocelot, SYS_PTP_NXT_PTP_NXT, SYS_PTP_NXT);
-
-		if (unlikely(!skb))
-			continue;
-
-		/* Get the h/w timestamp */
-		ocelot_get_hwtimestamp(ocelot, &ts);
-
-		/* Set the timestamp into the skb */
-		memset(&shhwtstamps, 0, sizeof(shhwtstamps));
-		shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
-		skb_tstamp_tx(skb, &shhwtstamps);
-
-		dev_kfree_skb_any(skb);
-	}
+	ocelot_get_txtstamp(ocelot);
 
 	return IRQ_HANDLED;
 }
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index a836afe8f68e..e1108a5f4f17 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -406,6 +406,13 @@ struct ocelot_ops {
 	int (*reset)(struct ocelot *ocelot);
 };
 
+struct ocelot_skb {
+	struct list_head head;
+	struct sk_buff *skb;
+	u8 id;
+};
+
+
 struct ocelot_port {
 	struct ocelot			*ocelot;
 
@@ -533,7 +540,11 @@ int ocelot_fdb_del(struct ocelot *ocelot, int port,
 int ocelot_vlan_add(struct ocelot *ocelot, int port, u16 vid, bool pvid,
 		    bool untagged);
 int ocelot_vlan_del(struct ocelot *ocelot, int port, u16 vid);
+int ocelot_hwstamp_get(struct ocelot *ocelot, int port, struct ifreq *ifr);
+int ocelot_hwstamp_set(struct ocelot *ocelot, int port, struct ifreq *ifr);
 int ocelot_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts);
-void ocelot_get_hwtimestamp(struct ocelot *ocelot, struct timespec64 *ts);
+int ocelot_port_add_txtstamp_skb(struct ocelot_port *ocelot_port,
+				 struct sk_buff *skb);
+void ocelot_get_txtstamp(struct ocelot *ocelot);
 
 #endif
diff --git a/net/dsa/tag_ocelot.c b/net/dsa/tag_ocelot.c
index 078d4790669d..8e3e7283d430 100644
--- a/net/dsa/tag_ocelot.c
+++ b/net/dsa/tag_ocelot.c
@@ -137,9 +137,11 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
 				   struct net_device *netdev)
 {
 	struct dsa_port *dp = dsa_slave_to_port(netdev);
-	u64 bypass, dest, src, qos_class;
+	u64 bypass, dest, src, qos_class, rew_op;
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;
+	struct ocelot *ocelot = ds->priv;
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
 	u8 *injection;
 
 	if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) {
@@ -161,6 +163,16 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
 	packing(injection, &src,       46,  43, OCELOT_TAG_LEN, PACK, 0);
 	packing(injection, &qos_class, 19,  17, OCELOT_TAG_LEN, PACK, 0);
 
+	if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
+		rew_op = ocelot_port->ptp_cmd;
+		if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
+			rew_op |= (ocelot_port->ts_id  % 4) << 3;
+			ocelot_port->ts_id++;
+		}
+
+		packing(injection, &rew_op, 125, 117, OCELOT_TAG_LEN, PACK, 0);
+	}
+
 	return skb;
 }