[PATCH net-next 0/7] Marvell PP2.2 PTP support

[PATCH net-next 0/7] Marvell PP2.2 PTP support

[Russell King - ARM Linux admin]

Hi,

This series adds PTP support for PP2.2 hardware to the mvpp2 driver.
Tested on the Macchiatobin eth1 port.

Note that on the Macchiatobin, eth0 uses a separate TAI block from
eth1, and there is no hardware synchronisation between the two.

 drivers/net/ethernet/marvell/Kconfig            |   6 +
 drivers/net/ethernet/marvell/mvpp2/Makefile     |   3 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h      | 202 +++++++++-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 410 ++++++++++++++++++---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c  | 467 ++++++++++++++++++++++++
 5 files changed, 1038 insertions(+), 50 deletions(-)
 create mode 100644 drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

[PATCH net-next 1/7] net: mvpp2: restructure "link status" interrupt handling

[Russell King]

The "link status" interrupt is used for more than just link status.
Restructure mvpp2_link_status_isr() so we can add additional handling.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 83 ++++++++++++-------
 1 file changed, 51 insertions(+), 32 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d0bbe3a64b8d..81473911a822 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2974,44 +2974,17 @@ static irqreturn_t mvpp2_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-/* Per-port interrupt for link status changes */
-static irqreturn_t mvpp2_link_status_isr(int irq, void *dev_id)
+static void mvpp2_isr_handle_link(struct mvpp2_port *port, bool link)
 {
-	struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
 	struct net_device *dev = port->dev;
-	bool event = false, link = false;
-	u32 val;
-
-	mvpp22_gop_mask_irq(port);
-
-	if (mvpp2_port_supports_xlg(port) &&
-	    mvpp2_is_xlg(port->phy_interface)) {
-		val = readl(port->base + MVPP22_XLG_INT_STAT);
-		if (val & MVPP22_XLG_INT_STAT_LINK) {
-			event = true;
-			val = readl(port->base + MVPP22_XLG_STATUS);
-			if (val & MVPP22_XLG_STATUS_LINK_UP)
-				link = true;
-		}
-	} else if (phy_interface_mode_is_rgmii(port->phy_interface) ||
-		   phy_interface_mode_is_8023z(port->phy_interface) ||
-		   port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
-		val = readl(port->base + MVPP22_GMAC_INT_STAT);
-		if (val & MVPP22_GMAC_INT_STAT_LINK) {
-			event = true;
-			val = readl(port->base + MVPP2_GMAC_STATUS0);
-			if (val & MVPP2_GMAC_STATUS0_LINK_UP)
-				link = true;
-		}
-	}
 
 	if (port->phylink) {
 		phylink_mac_change(port->phylink, link);
-		goto handled;
+		return;
 	}
 
-	if (!netif_running(dev) || !event)
-		goto handled;
+	if (!netif_running(dev))
+		return;
 
 	if (link) {
 		mvpp2_interrupts_enable(port);
@@ -3028,8 +3001,54 @@ static irqreturn_t mvpp2_link_status_isr(int irq, void *dev_id)
 
 		mvpp2_interrupts_disable(port);
 	}
+}
+
+static void mvpp2_isr_handle_xlg(struct mvpp2_port *port)
+{
+	bool link;
+	u32 val;
+
+	val = readl(port->base + MVPP22_XLG_INT_STAT);
+	if (val & MVPP22_XLG_INT_STAT_LINK) {
+		val = readl(port->base + MVPP22_XLG_STATUS);
+		if (val & MVPP22_XLG_STATUS_LINK_UP)
+			link = true;
+		mvpp2_isr_handle_link(port, link);
+	}
+}
+
+static void mvpp2_isr_handle_gmac_internal(struct mvpp2_port *port)
+{
+	bool link;
+	u32 val;
+
+	if (phy_interface_mode_is_rgmii(port->phy_interface) ||
+	    phy_interface_mode_is_8023z(port->phy_interface) ||
+	    port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
+		val = readl(port->base + MVPP22_GMAC_INT_STAT);
+		if (val & MVPP22_GMAC_INT_STAT_LINK) {
+			val = readl(port->base + MVPP2_GMAC_STATUS0);
+			if (val & MVPP2_GMAC_STATUS0_LINK_UP)
+				link = true;
+			mvpp2_isr_handle_link(port, link);
+		}
+	}
+}
+
+/* Per-port interrupt for link status changes */
+static irqreturn_t mvpp2_link_status_isr(int irq, void *dev_id)
+{
+	struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
+
+	mvpp22_gop_mask_irq(port);
+
+	if (mvpp2_port_supports_xlg(port) &&
+	    mvpp2_is_xlg(port->phy_interface)) {
+		mvpp2_isr_handle_xlg(port);
+	} else {
+		mvpp2_isr_handle_gmac_internal(port);
+	}
 
-handled:
 	mvpp22_gop_unmask_irq(port);
 	return IRQ_HANDLED;
 }
-- 
2.20.1

[PATCH net-next 2/7] net: mvpp2: rename mis-named "link status" interrupt

[Russell King]

The link interrupt is used for way more than just the link status; it
comes from a collection of units to do with the port. The Marvell
documentation describes the interrupt as "GOP port X interrupt".

Since we are adding PTP support, and the PTP interrupt uses this,
rename it to be more inline with the documentation.

This interrupt is also mis-named in the DT binding, but we leave that
alone.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    |  2 +-
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 35 ++++++++++---------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index ecb5f4616a36..a2f787c83756 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -915,7 +915,7 @@ struct mvpp2_port {
 	 */
 	int gop_id;
 
-	int link_irq;
+	int port_irq;
 
 	struct mvpp2 *priv;
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 81473911a822..41ffae8d5357 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3036,7 +3036,7 @@ static void mvpp2_isr_handle_gmac_internal(struct mvpp2_port *port)
 }
 
 /* Per-port interrupt for link status changes */
-static irqreturn_t mvpp2_link_status_isr(int irq, void *dev_id)
+static irqreturn_t mvpp2_port_isr(int irq, void *dev_id)
 {
 	struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
 
@@ -4230,12 +4230,13 @@ static int mvpp2_open(struct net_device *dev)
 		valid = true;
 	}
 
-	if (priv->hw_version == MVPP22 && port->link_irq) {
-		err = request_irq(port->link_irq, mvpp2_link_status_isr, 0,
+	if (priv->hw_version == MVPP22 && port->port_irq) {
+		err = request_irq(port->port_irq, mvpp2_port_isr, 0,
 				  dev->name, port);
 		if (err) {
-			netdev_err(port->dev, "cannot request link IRQ %d\n",
-				   port->link_irq);
+			netdev_err(port->dev,
+				   "cannot request port link/ptp IRQ %d\n",
+				   port->port_irq);
 			goto err_free_irq;
 		}
 
@@ -4246,7 +4247,7 @@ static int mvpp2_open(struct net_device *dev)
 
 		valid = true;
 	} else {
-		port->link_irq = 0;
+		port->port_irq = 0;
 	}
 
 	if (!valid) {
@@ -4290,8 +4291,8 @@ static int mvpp2_stop(struct net_device *dev)
 
 	if (port->phylink)
 		phylink_disconnect_phy(port->phylink);
-	if (port->link_irq)
-		free_irq(port->link_irq, port);
+	if (port->port_irq)
+		free_irq(port->port_irq, port);
 
 	mvpp2_irqs_deinit(port);
 	if (!port->has_tx_irqs) {
@@ -6056,16 +6057,16 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 		goto err_free_netdev;
 
 	if (port_node)
-		port->link_irq = of_irq_get_byname(port_node, "link");
+		port->port_irq = of_irq_get_byname(port_node, "link");
 	else
-		port->link_irq = fwnode_irq_get(port_fwnode, port->nqvecs + 1);
-	if (port->link_irq == -EPROBE_DEFER) {
+		port->port_irq = fwnode_irq_get(port_fwnode, port->nqvecs + 1);
+	if (port->port_irq == -EPROBE_DEFER) {
 		err = -EPROBE_DEFER;
 		goto err_deinit_qvecs;
 	}
-	if (port->link_irq <= 0)
+	if (port->port_irq <= 0)
 		/* the link irq is optional */
-		port->link_irq = 0;
+		port->port_irq = 0;
 
 	if (fwnode_property_read_bool(port_fwnode, "marvell,loopback"))
 		port->flags |= MVPP2_F_LOOPBACK;
@@ -6229,8 +6230,8 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 err_free_stats:
 	free_percpu(port->stats);
 err_free_irq:
-	if (port->link_irq)
-		irq_dispose_mapping(port->link_irq);
+	if (port->port_irq)
+		irq_dispose_mapping(port->port_irq);
 err_deinit_qvecs:
 	mvpp2_queue_vectors_deinit(port);
 err_free_netdev:
@@ -6251,8 +6252,8 @@ static void mvpp2_port_remove(struct mvpp2_port *port)
 	for (i = 0; i < port->ntxqs; i++)
 		free_percpu(port->txqs[i]->pcpu);
 	mvpp2_queue_vectors_deinit(port);
-	if (port->link_irq)
-		irq_dispose_mapping(port->link_irq);
+	if (port->port_irq)
+		irq_dispose_mapping(port->port_irq);
 	free_netdev(port->dev);
 }
 
-- 
2.20.1

[PATCH net-next 3/7] net: mvpp2: check first level interrupt status registers

[Russell King]

Check the first level interrupt status registers to determine how to
further process the port interrupt. We will need this to know whether
to invoke the link status processing and/or the PTP processing for
both XLG and GMAC.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h      |  4 ++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 13 +++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index a2f787c83756..273c46bbf927 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -461,6 +461,8 @@
 #define     MVPP22_CTRL4_DP_CLK_SEL		BIT(5)
 #define     MVPP22_CTRL4_SYNC_BYPASS_DIS	BIT(6)
 #define     MVPP22_CTRL4_QSGMII_BYPASS_ACTIVE	BIT(7)
+#define MVPP22_GMAC_INT_SUM_STAT		0xa0
+#define	    MVPP22_GMAC_INT_SUM_STAT_INTERNAL	BIT(1)
 #define MVPP22_GMAC_INT_SUM_MASK		0xa4
 #define     MVPP22_GMAC_INT_SUM_MASK_LINK_STAT	BIT(1)
 
@@ -488,6 +490,8 @@
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_MASK	(7 << 13)
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_GMAC	(0 << 13)
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_10G	(1 << 13)
+#define MVPP22_XLG_EXT_INT_STAT			0x158
+#define     MVPP22_XLG_EXT_INT_STAT_XLG		BIT(1)
 #define MVPP22_XLG_EXT_INT_MASK			0x15c
 #define     MVPP22_XLG_EXT_INT_MASK_XLG		BIT(1)
 #define     MVPP22_XLG_EXT_INT_MASK_GIG		BIT(2)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 41ffae8d5357..9dc8cf3d0873 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3039,14 +3039,23 @@ static void mvpp2_isr_handle_gmac_internal(struct mvpp2_port *port)
 static irqreturn_t mvpp2_port_isr(int irq, void *dev_id)
 {
 	struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
+	u32 val;
 
 	mvpp22_gop_mask_irq(port);
 
 	if (mvpp2_port_supports_xlg(port) &&
 	    mvpp2_is_xlg(port->phy_interface)) {
-		mvpp2_isr_handle_xlg(port);
+		/* Check the external status register */
+		val = readl(port->base + MVPP22_XLG_EXT_INT_STAT);
+		if (val & MVPP22_XLG_EXT_INT_STAT_XLG)
+			mvpp2_isr_handle_xlg(port);
 	} else {
-		mvpp2_isr_handle_gmac_internal(port);
+		/* If it's not the XLG, we must be using the GMAC.
+		 * Check the summary status.
+		 */
+		val = readl(port->base + MVPP22_GMAC_INT_SUM_STAT);
+		if (val & MVPP22_GMAC_INT_SUM_STAT_INTERNAL)
+			mvpp2_isr_handle_gmac_internal(port);
 	}
 
 	mvpp22_gop_unmask_irq(port);
-- 
2.20.1

[PATCH net-next 4/7] net: mvpp2: ptp: add TAI support

[Russell King]

Add support for the TAI block in the mvpp2.2 hardware.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/Kconfig          |   6 +
 drivers/net/ethernet/marvell/mvpp2/Makefile   |   3 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    | 109 +++++
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   |   4 +
 .../net/ethernet/marvell/mvpp2/mvpp2_tai.c    | 416 ++++++++++++++++++
 5 files changed, 537 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c

diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
index ef4f35ba077d..a599e44a36a8 100644
--- a/drivers/net/ethernet/marvell/Kconfig
+++ b/drivers/net/ethernet/marvell/Kconfig
@@ -92,6 +92,12 @@ config MVPP2
 	  This driver supports the network interface units in the
 	  Marvell ARMADA 375, 7K and 8K SoCs.
 
+config MVPP2_PTP
+	bool "Marvell Armada 8K Enable PTP support"
+	depends on NETWORK_PHY_TIMESTAMPING
+	depends on (PTP_1588_CLOCK = y && MVPP2 = y) || \
+		   (PTP_1588_CLOCK && MVPP2 = m)
+
 config PXA168_ETH
 	tristate "Marvell pxa168 ethernet support"
 	depends on HAS_IOMEM
diff --git a/drivers/net/ethernet/marvell/mvpp2/Makefile b/drivers/net/ethernet/marvell/mvpp2/Makefile
index 51f65a202c6e..9bd8e7964b40 100644
--- a/drivers/net/ethernet/marvell/mvpp2/Makefile
+++ b/drivers/net/ethernet/marvell/mvpp2/Makefile
@@ -4,4 +4,5 @@
 #
 obj-$(CONFIG_MVPP2) := mvpp2.o
 
-mvpp2-objs := mvpp2_main.o mvpp2_prs.o mvpp2_cls.o mvpp2_debugfs.o
+mvpp2-y := mvpp2_main.o mvpp2_prs.o mvpp2_cls.o mvpp2_debugfs.o
+mvpp2-$(CONFIG_MVPP2_PTP) += mvpp2_tai.o
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 273c46bbf927..b9fae3870393 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -505,6 +505,70 @@
 #define MVPP22_SMI_MISC_CFG_REG			0x1204
 #define     MVPP22_SMI_POLLING_EN		BIT(10)
 
+/* TAI registers, PPv2.2 only, relative to priv->iface_base */
+#define MVPP22_TAI_INT_CAUSE			0x1400
+#define MVPP22_TAI_INT_MASK			0x1404
+#define MVPP22_TAI_CR0				0x1408
+#define MVPP22_TAI_CR1				0x140c
+#define MVPP22_TAI_TCFCR0			0x1410
+#define MVPP22_TAI_TCFCR1			0x1414
+#define MVPP22_TAI_TCFCR2			0x1418
+#define MVPP22_TAI_FATWR			0x141c
+#define MVPP22_TAI_TOD_STEP_NANO_CR		0x1420
+#define MVPP22_TAI_TOD_STEP_FRAC_HIGH		0x1424
+#define MVPP22_TAI_TOD_STEP_FRAC_LOW		0x1428
+#define MVPP22_TAI_TAPDC_HIGH			0x142c
+#define MVPP22_TAI_TAPDC_LOW			0x1430
+#define MVPP22_TAI_TGTOD_SEC_HIGH		0x1434
+#define MVPP22_TAI_TGTOD_SEC_MED		0x1438
+#define MVPP22_TAI_TGTOD_SEC_LOW		0x143c
+#define MVPP22_TAI_TGTOD_NANO_HIGH		0x1440
+#define MVPP22_TAI_TGTOD_NANO_LOW		0x1444
+#define MVPP22_TAI_TGTOD_FRAC_HIGH		0x1448
+#define MVPP22_TAI_TGTOD_FRAC_LOW		0x144c
+#define MVPP22_TAI_TLV_SEC_HIGH			0x1450
+#define MVPP22_TAI_TLV_SEC_MED			0x1454
+#define MVPP22_TAI_TLV_SEC_LOW			0x1458
+#define MVPP22_TAI_TLV_NANO_HIGH		0x145c
+#define MVPP22_TAI_TLV_NANO_LOW			0x1460
+#define MVPP22_TAI_TLV_FRAC_HIGH		0x1464
+#define MVPP22_TAI_TLV_FRAC_LOW			0x1468
+#define MVPP22_TAI_TCV0_SEC_HIGH		0x146c
+#define MVPP22_TAI_TCV0_SEC_MED			0x1470
+#define MVPP22_TAI_TCV0_SEC_LOW			0x1474
+#define MVPP22_TAI_TCV0_NANO_HIGH		0x1478
+#define MVPP22_TAI_TCV0_NANO_LOW		0x147c
+#define MVPP22_TAI_TCV0_FRAC_HIGH		0x1480
+#define MVPP22_TAI_TCV0_FRAC_LOW		0x1484
+#define MVPP22_TAI_TCV1_SEC_HIGH		0x1488
+#define MVPP22_TAI_TCV1_SEC_MED			0x148c
+#define MVPP22_TAI_TCV1_SEC_LOW			0x1490
+#define MVPP22_TAI_TCV1_NANO_HIGH		0x1494
+#define MVPP22_TAI_TCV1_NANO_LOW		0x1498
+#define MVPP22_TAI_TCV1_FRAC_HIGH		0x149c
+#define MVPP22_TAI_TCV1_FRAC_LOW		0x14a0
+#define MVPP22_TAI_TCSR				0x14a4
+#define MVPP22_TAI_TUC_LSB			0x14a8
+#define MVPP22_TAI_GFM_SEC_HIGH			0x14ac
+#define MVPP22_TAI_GFM_SEC_MED			0x14b0
+#define MVPP22_TAI_GFM_SEC_LOW			0x14b4
+#define MVPP22_TAI_GFM_NANO_HIGH		0x14b8
+#define MVPP22_TAI_GFM_NANO_LOW			0x14bc
+#define MVPP22_TAI_GFM_FRAC_HIGH		0x14c0
+#define MVPP22_TAI_GFM_FRAC_LOW			0x14c4
+#define MVPP22_TAI_PCLK_DA_HIGH			0x14c8
+#define MVPP22_TAI_PCLK_DA_LOW			0x14cc
+#define MVPP22_TAI_CTCR				0x14d0
+#define MVPP22_TAI_PCLK_CCC_HIGH		0x14d4
+#define MVPP22_TAI_PCLK_CCC_LOW			0x14d8
+#define MVPP22_TAI_DTC_HIGH			0x14dc
+#define MVPP22_TAI_DTC_LOW			0x14e0
+#define MVPP22_TAI_CCC_HIGH			0x14e4
+#define MVPP22_TAI_CCC_LOW			0x14e8
+#define MVPP22_TAI_ICICE			0x14f4
+#define MVPP22_TAI_ICICC_LOW			0x14f8
+#define MVPP22_TAI_TUC_MSB			0x14fc
+
 #define MVPP22_GMAC_BASE(port)		(0x7000 + (port) * 0x1000 + 0xe00)
 
 #define MVPP2_CAUSE_TXQ_SENT_DESC_ALL_MASK	0xff
@@ -531,6 +595,39 @@
 #define     MVPP22_XPCS_CFG0_PCS_MODE(n)	((n) << 3)
 #define     MVPP22_XPCS_CFG0_ACTIVE_LANE(n)	((n) << 5)
 
+/* PTP registers. PPv2.2 only */
+#define MVPP22_PTP_BASE(port)			(0x7800 + (port * 0x1000))
+#define MVPP22_PTP_INT_CAUSE			0x00
+#define MVPP22_PTP_INT_MASK			0x04
+#define MVPP22_PTP_GCR				0x08
+#define MVPP22_PTP_TX_Q0_R0			0x0c
+#define MVPP22_PTP_TX_Q0_R1			0x10
+#define MVPP22_PTP_TX_Q0_R2			0x14
+#define MVPP22_PTP_TX_Q1_R0			0x18
+#define MVPP22_PTP_TX_Q1_R1			0x1c
+#define MVPP22_PTP_TX_Q1_R2			0x20
+#define MVPP22_PTP_TPCR				0x24
+#define MVPP22_PTP_V1PCR			0x28
+#define MVPP22_PTP_V2PCR			0x2c
+#define MVPP22_PTP_Y1731PCR			0x30
+#define MVPP22_PTP_NTPTSPCR			0x34
+#define MVPP22_PTP_NTPRXPCR			0x38
+#define MVPP22_PTP_NTPTXPCR			0x3c
+#define MVPP22_PTP_WAMPPCR			0x40
+#define MVPP22_PTP_NAPCR			0x44
+#define MVPP22_PTP_FAPCR			0x48
+#define MVPP22_PTP_CAPCR			0x50
+#define MVPP22_PTP_ATAPCR			0x54
+#define MVPP22_PTP_ACTAPCR			0x58
+#define MVPP22_PTP_CATAPCR			0x5c
+#define MVPP22_PTP_CACTAPCR			0x60
+#define MVPP22_PTP_AITAPCR			0x64
+#define MVPP22_PTP_CAITAPCR			0x68
+#define MVPP22_PTP_CITAPCR			0x6c
+#define MVPP22_PTP_NTP_OFF_HIGH			0x70
+#define MVPP22_PTP_NTP_OFF_LOW			0x74
+#define MVPP22_PTP_TX_PIPE_STATUS_DELAY		0x78
+
 /* System controller registers. Accessed through a regmap. */
 #define GENCONF_SOFT_RESET1				0x1108
 #define     GENCONF_SOFT_RESET1_GOP			BIT(6)
@@ -763,6 +860,8 @@ enum mvpp2_prs_l3_cast {
 
 #define MVPP2_DESC_DMA_MASK	DMA_BIT_MASK(40)
 
+struct mvpp2_tai;
+
 /* Definitions */
 struct mvpp2_dbgfs_entries;
 
@@ -798,6 +897,7 @@ struct mvpp2 {
 	/* List of pointers to port structures */
 	int port_count;
 	struct mvpp2_port *port_list[MVPP2_MAX_PORTS];
+	struct mvpp2_tai *tai;
 
 	/* Number of Tx threads used */
 	unsigned int nthreads;
@@ -1253,4 +1353,13 @@ void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name);
 
 void mvpp2_dbgfs_cleanup(struct mvpp2 *priv);
 
+#ifdef CONFIG_MVPP2_PTP
+int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv);
+#else
+static inline int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv)
+{
+	return 0;
+}
+#endif
+
 #endif
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 9dc8cf3d0873..d064e4b20df0 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -6674,6 +6674,10 @@ static int mvpp2_probe(struct platform_device *pdev)
 		goto err_axi_clk;
 	}
 
+	err = mvpp22_tai_probe(&pdev->dev, priv);
+	if (err < 0)
+		goto err_axi_clk;
+
 	/* Initialize ports */
 	fwnode_for_each_available_child_node(fwnode, port_fwnode) {
 		err = mvpp2_port_probe(pdev, port_fwnode, priv);
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c
new file mode 100644
index 000000000000..d6bc5d3f6110
--- /dev/null
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c
@@ -0,0 +1,416 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Marvell PP2.2 TAI support
+ *
+ * Note:
+ *   Do NOT use the event capture support.
+ *   Do Not even set the MPP muxes to allow PTP_EVENT_REQ to be used.
+ *   It will disrupt the operation of this driver, and there is nothing
+ *   that this driver can do to prevent that.  Even using PTP_EVENT_REQ
+ *   as an output will be seen as a trigger input, which can't be masked.
+ *   When ever a trigger input is seen, the action in the TCFCR0_TCF
+ *   field will be performed - whether it is a set, increment, decrement
+ *   read, or frequency update.
+ *
+ * Other notes (useful, not specified in the documentation):
+ * - PTP_PULSE_OUT (PTP_EVENT_REQ MPP)
+ *   It looks like the hardware can't generate a pulse at nsec=0. (The
+ *   output doesn't trigger if the nsec field is zero.)
+ *   Note: when configured as an output via the register at 0xfX441120,
+ *   the input is still very much alive, and will trigger the current TCF
+ *   function.
+ * - PTP_CLK_OUT (PTP_TRIG_GEN MPP)
+ *   This generates a "PPS" signal determined by the CCC registers. It
+ *   seems this is not aligned to the TOD counter in any way (it may be
+ *   initially, but if you specify a non-round second interval, it won't,
+ *   and you can't easily get it back.)
+ * - PTP_PCLK_OUT
+ *   This generates a 50% duty cycle clock based on the TOD counter, and
+ *   seems it can be set to any period of 1ns resolution. It is probably
+ *   limited by the TOD step size. Its period is defined by the PCLK_CCC
+ *   registers. Again, its alignment to the second is questionable.
+ *
+ * Consequently, we support none of these.
+ */
+#include <linux/io.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/slab.h>
+
+#include "mvpp2.h"
+
+#define CR0_SW_NRESET			BIT(0)
+
+#define TCFCR0_PHASE_UPDATE_ENABLE	BIT(8)
+#define TCFCR0_TCF_MASK			(7 << 2)
+#define TCFCR0_TCF_UPDATE		(0 << 2)
+#define TCFCR0_TCF_FREQUPDATE		(1 << 2)
+#define TCFCR0_TCF_INCREMENT		(2 << 2)
+#define TCFCR0_TCF_DECREMENT		(3 << 2)
+#define TCFCR0_TCF_CAPTURE		(4 << 2)
+#define TCFCR0_TCF_NOP			(7 << 2)
+#define TCFCR0_TCF_TRIGGER		BIT(0)
+
+#define TCSR_CAPTURE_1_VALID		BIT(1)
+#define TCSR_CAPTURE_0_VALID		BIT(0)
+
+struct mvpp2_tai {
+	struct ptp_clock_info caps;
+	struct ptp_clock *ptp_clock;
+	void __iomem *base;
+	spinlock_t lock;
+	u64 period;		// nanosecond period in 32.32 fixed point
+};
+
+static void mvpp2_tai_modify(void __iomem *reg, u32 mask, u32 set)
+{
+	u32 val;
+
+	val = readl_relaxed(reg) & ~mask;
+	val |= set & mask;
+	writel(val, reg);
+}
+
+static void mvpp2_tai_write(u32 val, void __iomem *reg)
+{
+	writel_relaxed(val & 0xffff, reg);
+}
+
+static u32 mvpp2_tai_read(void __iomem *reg)
+{
+	return readl_relaxed(reg) & 0xffff;
+}
+
+static struct mvpp2_tai *ptp_to_tai(struct ptp_clock_info *ptp)
+{
+	return container_of(ptp, struct mvpp2_tai, caps);
+}
+
+static void mvpp22_tai_read_ts(struct timespec64 *ts, void __iomem *base)
+{
+	ts->tv_sec = (u64)mvpp2_tai_read(base + 0) << 32 |
+		     mvpp2_tai_read(base + 4) << 16 |
+		     mvpp2_tai_read(base + 8);
+
+	ts->tv_nsec = mvpp2_tai_read(base + 12) << 16 |
+		      mvpp2_tai_read(base + 16);
+
+	/* Read and discard fractional part */
+	readl_relaxed(base + 20);
+	readl_relaxed(base + 24);
+}
+
+static void mvpp2_tai_write_tlv(const struct timespec64 *ts, u32 frac,
+			        void __iomem *base)
+{
+	mvpp2_tai_write(ts->tv_sec >> 32, base + MVPP22_TAI_TLV_SEC_HIGH);
+	mvpp2_tai_write(ts->tv_sec >> 16, base + MVPP22_TAI_TLV_SEC_MED);
+	mvpp2_tai_write(ts->tv_sec, base + MVPP22_TAI_TLV_SEC_LOW);
+	mvpp2_tai_write(ts->tv_nsec >> 16, base + MVPP22_TAI_TLV_NANO_HIGH);
+	mvpp2_tai_write(ts->tv_nsec, base + MVPP22_TAI_TLV_NANO_LOW);
+	mvpp2_tai_write(frac >> 16, base + MVPP22_TAI_TLV_FRAC_HIGH);
+	mvpp2_tai_write(frac, base + MVPP22_TAI_TLV_FRAC_LOW);
+}
+
+static void mvpp2_tai_op(u32 op, void __iomem *base)
+{
+	/* Trigger the operation. Note that an external unmaskable
+	 * event on PTP_EVENT_REQ will also trigger this action.
+	 */
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0,
+			 TCFCR0_TCF_MASK | TCFCR0_TCF_TRIGGER,
+			 op | TCFCR0_TCF_TRIGGER);
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0, TCFCR0_TCF_MASK,
+			 TCFCR0_TCF_NOP);
+}
+
+/* The adjustment has a range of +0.5ns to -0.5ns in 2^32 steps, so has units
+ * of 2^-32 ns.
+ *
+ * units(s) = 1 / (2^32 * 10^9)
+ * fractional = abs_scaled_ppm / (2^16 * 10^6)
+ *
+ * What we want to achieve:
+ *  freq_adjusted = freq_nominal * (1 + fractional)
+ *  freq_delta = freq_adjusted - freq_nominal => positive = faster
+ *  freq_delta = freq_nominal * (1 + fractional) - freq_nominal
+ * So: freq_delta = freq_nominal * fractional
+ *
+ * However, we are dealing with periods, so:
+ *  period_adjusted = period_nominal / (1 + fractional)
+ *  period_delta = period_nominal - period_adjusted => positive = faster
+ *  period_delta = period_nominal * fractional / (1 + fractional)
+ *
+ * Hence:
+ *  period_delta = period_nominal * abs_scaled_ppm /
+ *		   (2^16 * 10^6 + abs_scaled_ppm)
+ *
+ * To avoid overflow, we reduce both sides of the divide operation by a factor
+ * of 16.
+ */
+static u64 mvpp22_calc_frac_ppm(struct mvpp2_tai *tai, long abs_scaled_ppm)
+{
+	u64 val = tai->period * abs_scaled_ppm >> 4;
+
+	return div_u64(val, (1000000 << 12) + (abs_scaled_ppm >> 4));
+}
+
+static s32 mvpp22_calc_max_adj(struct mvpp2_tai *tai)
+{
+	return 1000000;
+}
+
+static int mvpp22_tai_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+	struct mvpp2_tai *tai = ptp_to_tai(ptp);
+	unsigned long flags;
+	void __iomem *base;
+	bool neg_adj;
+	s32 frac;
+	u64 val;
+
+	neg_adj = scaled_ppm < 0;
+	if (neg_adj)
+		scaled_ppm = -scaled_ppm;
+
+	val = mvpp22_calc_frac_ppm(tai, scaled_ppm);
+
+	/* Convert to a signed 32-bit adjustment */
+	if (neg_adj) {
+		/* -S32_MIN warns, -val < S32_MIN fails, so go for the easy
+		 * solution.
+		 */
+		if (val > 0x80000000)
+			return -ERANGE;
+
+		frac = -val;
+	} else {
+		if (val > S32_MAX)
+			return -ERANGE;
+
+		frac = val;
+	}
+
+	base = tai->base;
+	spin_lock_irqsave(&tai->lock, flags);
+	mvpp2_tai_write(frac >> 16, base + MVPP22_TAI_TLV_FRAC_HIGH);
+	mvpp2_tai_write(frac, base + MVPP22_TAI_TLV_FRAC_LOW);
+	mvpp2_tai_op(TCFCR0_TCF_FREQUPDATE, base);
+	spin_unlock_irqrestore(&tai->lock, flags);
+
+	return 0;
+}
+
+static int mvpp22_tai_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct mvpp2_tai *tai = ptp_to_tai(ptp);
+	struct timespec64 ts;
+	unsigned long flags;
+	void __iomem *base;
+	u32 tcf;
+
+	/* We can't deal with S64_MIN */
+	if (delta == S64_MIN)
+		return -ERANGE;
+
+	if (delta < 0) {
+		delta = -delta;
+		tcf = TCFCR0_TCF_DECREMENT;
+	} else {
+		tcf = TCFCR0_TCF_INCREMENT;
+	}
+
+	ts = ns_to_timespec64(delta);
+
+	base = tai->base;
+	spin_lock_irqsave(&tai->lock, flags);
+	mvpp2_tai_write_tlv(&ts, 0, base);
+	mvpp2_tai_op(tcf, base);
+	spin_unlock_irqrestore(&tai->lock, flags);
+
+	return 0;
+}
+
+static int mvpp22_tai_gettimex64(struct ptp_clock_info *ptp,
+				 struct timespec64 *ts,
+				 struct ptp_system_timestamp *sts)
+{
+	struct mvpp2_tai *tai = ptp_to_tai(ptp);
+	unsigned long flags;
+	void __iomem *base;
+	u32 tcsr;
+	int ret;
+
+	base = tai->base;
+	spin_lock_irqsave(&tai->lock, flags);
+	/* XXX: the only way to read the PTP time is for the CPU to trigger
+	 * an event. However, there is no way to distinguish between the CPU
+	 * triggered event, and an external event on PTP_EVENT_REQ. So this
+	 * is incompatible with external use of PTP_EVENT_REQ.
+	 */
+	ptp_read_system_prets(sts);
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0,
+			 TCFCR0_TCF_MASK | TCFCR0_TCF_TRIGGER,
+			 TCFCR0_TCF_CAPTURE | TCFCR0_TCF_TRIGGER);
+	ptp_read_system_postts(sts);
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0, TCFCR0_TCF_MASK,
+			 TCFCR0_TCF_NOP);
+
+	tcsr = readl(base + MVPP22_TAI_TCSR);
+	if (tcsr & TCSR_CAPTURE_1_VALID) {
+		mvpp22_tai_read_ts(ts, base + MVPP22_TAI_TCV1_SEC_HIGH);
+		ret = 0;
+	} else if (tcsr & TCSR_CAPTURE_0_VALID) {
+		mvpp22_tai_read_ts(ts, base + MVPP22_TAI_TCV0_SEC_HIGH);
+		ret = 0;
+	} else {
+		/* We don't seem to have a reading... */
+		ret = -EBUSY;
+	}
+	spin_unlock_irqrestore(&tai->lock, flags);
+
+	return ret;
+}
+
+static int mvpp22_tai_settime64(struct ptp_clock_info *ptp,
+				const struct timespec64 *ts)
+{
+	struct mvpp2_tai *tai = ptp_to_tai(ptp);
+	unsigned long flags;
+	void __iomem *base;
+
+	base = tai->base;
+	spin_lock_irqsave(&tai->lock, flags);
+	mvpp2_tai_write_tlv(ts, 0, base);
+
+	/* Trigger an update to load the value from the TLV registers
+	 * into the TOD counter. Note that an external unmaskable event on
+	 * PTP_EVENT_REQ will also trigger this action.
+	 */
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0,
+			 TCFCR0_PHASE_UPDATE_ENABLE |
+			 TCFCR0_TCF_MASK | TCFCR0_TCF_TRIGGER,
+			 TCFCR0_TCF_UPDATE | TCFCR0_TCF_TRIGGER);
+	mvpp2_tai_modify(base + MVPP22_TAI_TCFCR0, TCFCR0_TCF_MASK,
+			 TCFCR0_TCF_NOP);
+	spin_unlock_irqrestore(&tai->lock, flags);
+
+	return 0;
+}
+
+static long mvpp22_tai_aux_work(struct ptp_clock_info *ptp)
+{
+	return 0;
+}
+
+static void mvpp22_tai_set_step(struct mvpp2_tai *tai)
+{
+	void __iomem *base = tai->base;
+	u32 nano, frac;
+
+	nano = upper_32_bits(tai->period);
+	frac = lower_32_bits(tai->period);
+
+	/* As the fractional nanosecond is a signed offset, if the MSB (sign)
+	 * bit is set, we have to increment the whole nanoseconds.
+	 */
+	if (frac >= 0x80000000)
+		nano += 1;
+
+	mvpp2_tai_write(nano, base + MVPP22_TAI_TOD_STEP_NANO_CR);
+	mvpp2_tai_write(frac >> 16, base + MVPP22_TAI_TOD_STEP_FRAC_HIGH);
+	mvpp2_tai_write(frac, base + MVPP22_TAI_TOD_STEP_FRAC_LOW);
+}
+
+static void mvpp22_tai_set_tod(struct mvpp2_tai *tai)
+{
+	struct timespec64 now;
+
+	ktime_get_real_ts64(&now);
+	mvpp22_tai_settime64(&tai->caps, &now);
+}
+
+static void mvpp22_tai_init(struct mvpp2_tai *tai)
+{
+	void __iomem *base = tai->base;
+
+	mvpp22_tai_set_step(tai);
+
+	/* Release the TAI reset */
+	mvpp2_tai_modify(base + MVPP22_TAI_CR0, CR0_SW_NRESET, CR0_SW_NRESET);
+
+	mvpp22_tai_set_tod(tai);
+}
+
+static void mvpp22_tai_remove(void *priv)
+{
+	struct mvpp2_tai *tai = priv;
+
+	if (!IS_ERR(tai->ptp_clock))
+		ptp_clock_unregister(tai->ptp_clock);
+}
+
+int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv)
+{
+	struct mvpp2_tai *tai;
+	int ret;
+
+	tai = devm_kzalloc(dev, sizeof(*tai), GFP_KERNEL);
+	if (!tai)
+		return -ENOMEM;
+
+	spin_lock_init(&tai->lock);
+
+	tai->base = priv->iface_base;
+
+	/* The step size consists of three registers - a 16-bit nanosecond step
+	 * size, and a 32-bit fractional nanosecond step size split over two
+	 * registers. The fractional nanosecond step size has units of 2^-32ns.
+	 *
+	 * To calculate this, we calculate:
+	 *   (10^9 + freq / 2) / (freq * 2^-32)
+	 * which gives us the nanosecond step to the nearest integer in 16.32
+	 * fixed point format, and the fractional part of the step size with
+	 * the MSB inverted.  With rounding of the fractional nanosecond, and
+	 * simplification, this becomes:
+	 *   (10^9 << 32 + freq << 31 + (freq + 1) >> 1) / freq
+	 *
+	 * So:
+	 *   div = (10^9 << 32 + freq << 31 + (freq + 1) >> 1) / freq
+	 *   nano = upper_32_bits(div);
+	 *   frac = lower_32_bits(div) ^ 0x80000000;
+	 * Will give the values for the registers.
+	 *
+	 * This is all seems perfect, but alas it is not when considering the
+	 * whole story.  The system is clocked from 25MHz, which is multiplied
+	 * by a PLL to 1GHz, and then divided by three, giving 333333333Hz
+	 * (recurring).  This gives exactly 3ns, but using 333333333Hz with
+	 * the above gives an error of 13*2^-32ns.
+	 *
+	 * Consequently, we use the period rather than calculating from the
+	 * frequency.
+	 */
+	tai->period = 3ULL << 32;
+
+	mvpp22_tai_init(tai);
+
+	tai->caps.owner = THIS_MODULE;
+	strscpy(tai->caps.name, "Marvell PP2.2", sizeof(tai->caps.name));
+	tai->caps.max_adj = mvpp22_calc_max_adj(tai);
+	tai->caps.adjfine = mvpp22_tai_adjfine;
+	tai->caps.adjtime = mvpp22_tai_adjtime;
+	tai->caps.gettimex64 = mvpp22_tai_gettimex64;
+	tai->caps.settime64 = mvpp22_tai_settime64;
+	tai->caps.do_aux_work = mvpp22_tai_aux_work;
+
+	ret = devm_add_action(dev, mvpp22_tai_remove, tai);
+	if (ret)
+		return ret;
+
+	tai->ptp_clock = ptp_clock_register(&tai->caps, dev);
+	if (IS_ERR(tai->ptp_clock))
+		return PTR_ERR(tai->ptp_clock);
+
+	priv->tai = tai;
+
+	return 0;
+}
-- 
2.20.1

[PATCH net-next 5/7] net: mvpp2: ptp: add support for receive timestamping

[Russell King]

Add support for receive timestamping. When enabled, the hardware adds
a timestamp into the receive queue descriptor for all received packets
with no filtering. Hence, we can only support NONE or ALL receive
filter modes.

The timestamp in the receive queue contains two bit sof seconds and
the full nanosecond timestamp. This has to be merged with the remainder
of the seconds from the TAI clock to arrive at a full timestamp before
we can convert it to a ktime for the skb hardware timestamp field.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    |  31 ++++-
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 108 +++++++++++++++++-
 .../net/ethernet/marvell/mvpp2/mvpp2_tai.c    |  53 ++++++++-
 3 files changed, 189 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index b9fae3870393..75467411900e 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -600,6 +600,9 @@
 #define MVPP22_PTP_INT_CAUSE			0x00
 #define MVPP22_PTP_INT_MASK			0x04
 #define MVPP22_PTP_GCR				0x08
+#define     MVPP22_PTP_GCR_RX_RESET		BIT(13)
+#define     MVPP22_PTP_GCR_TX_RESET		BIT(1)
+#define     MVPP22_PTP_GCR_TSU_ENABLE		BIT(0)
 #define MVPP22_PTP_TX_Q0_R0			0x0c
 #define MVPP22_PTP_TX_Q0_R1			0x10
 #define MVPP22_PTP_TX_Q0_R2			0x14
@@ -1094,6 +1097,9 @@ struct mvpp2_port {
 	 * them from 0
 	 */
 	int rss_ctx[MVPP22_N_RSS_TABLES];
+
+	bool hwtstamp;
+	bool rx_hwtstamp;
 };
 
 /* The mvpp2_tx_desc and mvpp2_rx_desc structures describe the
@@ -1173,7 +1179,7 @@ struct mvpp22_rx_desc {
 	__le16 reserved1;
 	__le16 data_size;
 	__le32 reserved2;
-	__le32 reserved3;
+	__le32 timestamp;
 	__le64 buf_dma_addr_key_hash;
 	__le64 buf_cookie_misc;
 };
@@ -1355,11 +1361,34 @@ void mvpp2_dbgfs_cleanup(struct mvpp2 *priv);
 
 #ifdef CONFIG_MVPP2_PTP
 int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv);
+void mvpp22_tai_tstamp(struct mvpp2_tai *tai, u32 tstamp,
+		       struct skb_shared_hwtstamps *hwtstamp);
+void mvpp22_tai_start(struct mvpp2_tai *tai);
+void mvpp22_tai_stop(struct mvpp2_tai *tai);
+int mvpp22_tai_ptp_clock_index(struct mvpp2_tai *tai);
 #else
 static inline int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv)
 {
 	return 0;
 }
+static inline void mvpp22_tai_tstamp(struct mvpp2_tai *tai, u32 tstamp,
+				     struct skb_shared_hwtstamps *hwtstamp)
+{
+}
+static inline void mvpp22_tai_start(struct mvpp2_tai *tai)
+{
+}
+static inline void mvpp22_tai_stop(struct mvpp2_tai *tai)
+{
+}
+static inline int mvpp22_tai_ptp_clock_index(struct mvpp2_tai *tai)
+{
+	return -1;
+}
 #endif
 
+static inline bool mvpp22_rx_hwtstamping(struct mvpp2_port *port)
+{
+	return IS_ENABLED(CONFIG_MVPP2_PTP) && port->rx_hwtstamp;
+}
 #endif
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d064e4b20df0..c20fde0fc73c 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3449,7 +3449,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
 		unsigned int frag_size;
 		dma_addr_t dma_addr;
 		phys_addr_t phys_addr;
-		u32 rx_status;
+		u32 rx_status, timestamp;
 		int pool, rx_bytes, err, ret;
 		void *data;
 
@@ -3527,6 +3527,15 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
 			goto err_drop_frame;
 		}
 
+		/* If we have RX hardware timestamping enabled, grab the
+		 * timestamp from the queue and convert.
+		 */
+		if (mvpp22_rx_hwtstamping(port)) {
+			timestamp = le32_to_cpu(rx_desc->pp22.timestamp);
+			mvpp22_tai_tstamp(port->priv->tai, timestamp,
+					 skb_hwtstamps(skb));
+		}
+
 		err = mvpp2_rx_refill(port, bm_pool, pp, pool);
 		if (err) {
 			netdev_err(port->dev, "failed to refill BM pools\n");
@@ -4561,10 +4570,100 @@ mvpp2_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 	stats->tx_dropped	= dev->stats.tx_dropped;
 }
 
+static int mvpp2_set_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+	void __iomem *ptp;
+
+	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+		return -EFAULT;
+
+	if (config.flags)
+		return -EINVAL;
+
+	if (config.tx_type != HWTSTAMP_TX_OFF)
+		return -ERANGE;
+
+	ptp = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
+	if (config.rx_filter != HWTSTAMP_FILTER_NONE) {
+		config.rx_filter = HWTSTAMP_FILTER_ALL;
+		mvpp22_tai_start(port->priv->tai);
+		mvpp2_modify(ptp + MVPP22_PTP_GCR,
+			     MVPP22_PTP_GCR_RX_RESET |
+			     MVPP22_PTP_GCR_TX_RESET |
+			     MVPP22_PTP_GCR_TSU_ENABLE,
+			     MVPP22_PTP_GCR_RX_RESET |
+			     MVPP22_PTP_GCR_TX_RESET |
+			     MVPP22_PTP_GCR_TSU_ENABLE);
+		port->rx_hwtstamp = true;
+	} else {
+		port->rx_hwtstamp = false;
+		mvpp2_modify(ptp + MVPP22_PTP_GCR,
+			     MVPP22_PTP_GCR_RX_RESET |
+			     MVPP22_PTP_GCR_TX_RESET |
+			     MVPP22_PTP_GCR_TSU_ENABLE, 0);
+		mvpp22_tai_stop(port->priv->tai);
+	}
+
+	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int mvpp2_get_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+
+	memset(&config, 0, sizeof(config));
+
+	config.tx_type = HWTSTAMP_TX_OFF;
+	config.rx_filter = port->rx_hwtstamp ?
+		HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE;
+
+	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int mvpp2_ethtool_get_ts_info(struct net_device *dev,
+				     struct ethtool_ts_info *info)
+{
+	struct mvpp2_port *port = netdev_priv(dev);
+
+	if (!port->hwtstamp)
+		return -EOPNOTSUPP;
+
+	info->phc_index = mvpp22_tai_ptp_clock_index(port->priv->tai);
+	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
+				SOF_TIMESTAMPING_RX_SOFTWARE |
+				SOF_TIMESTAMPING_SOFTWARE |
+				SOF_TIMESTAMPING_RX_HARDWARE |
+				SOF_TIMESTAMPING_RAW_HARDWARE;
+	info->tx_types = BIT(HWTSTAMP_TX_OFF);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
+			   BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+
 static int mvpp2_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
 	struct mvpp2_port *port = netdev_priv(dev);
 
+	switch (cmd) {
+	case SIOCSHWTSTAMP:
+		if (port->hwtstamp)
+			return mvpp2_set_ts_config(port, ifr);
+		break;
+
+	case SIOCGHWTSTAMP:
+		if (port->hwtstamp)
+			return mvpp2_get_ts_config(port, ifr);
+		break;
+	}
+
 	if (!port->phylink)
 		return -ENOTSUPP;
 
@@ -5034,6 +5133,7 @@ static const struct ethtool_ops mvpp2_eth_tool_ops = {
 				     ETHTOOL_COALESCE_MAX_FRAMES,
 	.nway_reset		= mvpp2_ethtool_nway_reset,
 	.get_link		= ethtool_op_get_link,
+	.get_ts_info		= mvpp2_ethtool_get_ts_info,
 	.set_coalesce		= mvpp2_ethtool_set_coalesce,
 	.get_coalesce		= mvpp2_ethtool_get_coalesce,
 	.get_drvinfo		= mvpp2_ethtool_get_drvinfo,
@@ -6112,6 +6212,12 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 		port->stats_base = port->priv->iface_base +
 				   MVPP22_MIB_COUNTERS_OFFSET +
 				   port->gop_id * MVPP22_MIB_COUNTERS_PORT_SZ;
+
+		/* We may want a property to describe whether we should use
+		 * MAC hardware timestamping.
+		 */
+		if (priv->tai)
+			port->hwtstamp = true;
 	}
 
 	/* Alloc per-cpu and ethtool stats */
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c
index d6bc5d3f6110..1b88aad21377 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_tai.c
@@ -59,6 +59,8 @@ struct mvpp2_tai {
 	void __iomem *base;
 	spinlock_t lock;
 	u64 period;		// nanosecond period in 32.32 fixed point
+	/* This timestamp is updated every two seconds */
+	struct timespec64 stamp;
 };
 
 static void mvpp2_tai_modify(void __iomem *reg, u32 mask, u32 set)
@@ -299,7 +301,11 @@ static int mvpp22_tai_settime64(struct ptp_clock_info *ptp,
 
 static long mvpp22_tai_aux_work(struct ptp_clock_info *ptp)
 {
-	return 0;
+	struct mvpp2_tai *tai = ptp_to_tai(ptp);
+
+	mvpp22_tai_gettimex64(ptp, &tai->stamp, NULL);
+
+	return msecs_to_jiffies(2000);
 }
 
 static void mvpp22_tai_set_step(struct mvpp2_tai *tai)
@@ -341,6 +347,51 @@ static void mvpp22_tai_init(struct mvpp2_tai *tai)
 	mvpp22_tai_set_tod(tai);
 }
 
+int mvpp22_tai_ptp_clock_index(struct mvpp2_tai *tai)
+{
+	return ptp_clock_index(tai->ptp_clock);
+}
+
+void mvpp22_tai_tstamp(struct mvpp2_tai *tai, u32 tstamp,
+		       struct skb_shared_hwtstamps *hwtstamp)
+{
+	struct timespec64 ts;
+	int delta;
+
+	/* The tstamp consists of 2 bits of seconds and 30 bits of nanoseconds.
+	 * We use our stored timestamp (tai->stamp) to form a full timestamp,
+	 * and we must read the seconds exactly once.
+	 */
+	ts.tv_sec = READ_ONCE(tai->stamp.tv_sec);
+	ts.tv_nsec = tstamp & 0x3fffffff;
+
+	/* Calculate the delta in seconds between our stored timestamp and
+	 * the value read from the queue. Allow timestamps one second in the
+	 * past, otherwise consider them to be in the future.
+	 */
+	delta = ((tstamp >> 30) - (ts.tv_sec & 3)) & 3;
+	if (delta == 3)
+		delta -= 4;
+	ts.tv_sec += delta;
+
+	memset(hwtstamp, 0, sizeof(*hwtstamp));
+	hwtstamp->hwtstamp = timespec64_to_ktime(ts);
+}
+
+void mvpp22_tai_start(struct mvpp2_tai *tai)
+{
+	long delay;
+
+	delay = mvpp22_tai_aux_work(&tai->caps);
+
+	ptp_schedule_worker(tai->ptp_clock, delay);
+}
+
+void mvpp22_tai_stop(struct mvpp2_tai *tai)
+{
+	ptp_cancel_worker_sync(tai->ptp_clock);
+}
+
 static void mvpp22_tai_remove(void *priv)
 {
 	struct mvpp2_tai *tai = priv;
-- 
2.20.1

[PATCH net-next 6/7] net: mvpp2: ptp: add interrupt handling

[Russell King]

Add PTP interrupt handling infrastructure, which is used to read the
transmit timestamps from two hardware queues.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    |  8 ++++
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 44 +++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 75467411900e..50956551b336 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -463,8 +463,10 @@
 #define     MVPP22_CTRL4_QSGMII_BYPASS_ACTIVE	BIT(7)
 #define MVPP22_GMAC_INT_SUM_STAT		0xa0
 #define	    MVPP22_GMAC_INT_SUM_STAT_INTERNAL	BIT(1)
+#define	    MVPP22_GMAC_INT_SUM_STAT_PTP	BIT(2)
 #define MVPP22_GMAC_INT_SUM_MASK		0xa4
 #define     MVPP22_GMAC_INT_SUM_MASK_LINK_STAT	BIT(1)
+#define	    MVPP22_GMAC_INT_SUM_MASK_PTP	BIT(2)
 
 /* Per-port XGMAC registers. PPv2.2 only, only for GOP port 0,
  * relative to port->base.
@@ -492,9 +494,11 @@
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_10G	(1 << 13)
 #define MVPP22_XLG_EXT_INT_STAT			0x158
 #define     MVPP22_XLG_EXT_INT_STAT_XLG		BIT(1)
+#define     MVPP22_XLG_EXT_INT_STAT_PTP		BIT(7)
 #define MVPP22_XLG_EXT_INT_MASK			0x15c
 #define     MVPP22_XLG_EXT_INT_MASK_XLG		BIT(1)
 #define     MVPP22_XLG_EXT_INT_MASK_GIG		BIT(2)
+#define     MVPP22_XLG_EXT_INT_MASK_PTP		BIT(7)
 #define MVPP22_XLG_CTRL4_REG			0x184
 #define     MVPP22_XLG_CTRL4_FWD_FC		BIT(5)
 #define     MVPP22_XLG_CTRL4_FWD_PFC		BIT(6)
@@ -598,7 +602,11 @@
 /* PTP registers. PPv2.2 only */
 #define MVPP22_PTP_BASE(port)			(0x7800 + (port * 0x1000))
 #define MVPP22_PTP_INT_CAUSE			0x00
+#define     MVPP22_PTP_INT_CAUSE_QUEUE1		BIT(6)
+#define     MVPP22_PTP_INT_CAUSE_QUEUE0		BIT(5)
 #define MVPP22_PTP_INT_MASK			0x04
+#define     MVPP22_PTP_INT_MASK_QUEUE1		BIT(6)
+#define     MVPP22_PTP_INT_MASK_QUEUE0		BIT(5)
 #define MVPP22_PTP_GCR				0x08
 #define     MVPP22_PTP_GCR_RX_RESET		BIT(13)
 #define     MVPP22_PTP_GCR_TX_RESET		BIT(1)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index c20fde0fc73c..f3148e033bfe 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1379,6 +1379,10 @@ static void mvpp22_gop_setup_irq(struct mvpp2_port *port)
 {
 	u32 val;
 
+	mvpp2_modify(port->base + MVPP22_GMAC_INT_SUM_MASK,
+		     MVPP22_GMAC_INT_SUM_MASK_PTP,
+		     MVPP22_GMAC_INT_SUM_MASK_PTP);
+
 	if (port->phylink ||
 	    phy_interface_mode_is_rgmii(port->phy_interface) ||
 	    phy_interface_mode_is_8023z(port->phy_interface) ||
@@ -1392,6 +1396,10 @@ static void mvpp22_gop_setup_irq(struct mvpp2_port *port)
 		val = readl(port->base + MVPP22_XLG_INT_MASK);
 		val |= MVPP22_XLG_INT_MASK_LINK;
 		writel(val, port->base + MVPP22_XLG_INT_MASK);
+
+		mvpp2_modify(port->base + MVPP22_XLG_EXT_INT_MASK,
+			     MVPP22_XLG_EXT_INT_MASK_PTP,
+			     MVPP22_XLG_EXT_INT_MASK_PTP);
 	}
 
 	mvpp22_gop_unmask_irq(port);
@@ -2974,6 +2982,38 @@ static irqreturn_t mvpp2_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
+{
+	void __iomem *ptp_q;
+	u32 r0, r1, r2;
+
+	ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
+	if (nq)
+		ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
+
+	while (1) {
+		r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
+		if (!r0)
+			break;
+
+		r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
+		r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
+	}
+}
+
+static void mvpp2_isr_handle_ptp(struct mvpp2_port *port)
+{
+	void __iomem *ptp;
+	u32 val;
+
+	ptp = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
+	val = readl(ptp + MVPP22_PTP_INT_CAUSE);
+	if (val & MVPP22_PTP_INT_CAUSE_QUEUE0)
+		mvpp2_isr_handle_ptp_queue(port, 0);
+	if (val & MVPP22_PTP_INT_CAUSE_QUEUE1)
+		mvpp2_isr_handle_ptp_queue(port, 1);
+}
+
 static void mvpp2_isr_handle_link(struct mvpp2_port *port, bool link)
 {
 	struct net_device *dev = port->dev;
@@ -3049,6 +3089,8 @@ static irqreturn_t mvpp2_port_isr(int irq, void *dev_id)
 		val = readl(port->base + MVPP22_XLG_EXT_INT_STAT);
 		if (val & MVPP22_XLG_EXT_INT_STAT_XLG)
 			mvpp2_isr_handle_xlg(port);
+		if (val & MVPP22_XLG_EXT_INT_STAT_PTP)
+			mvpp2_isr_handle_ptp(port);
 	} else {
 		/* If it's not the XLG, we must be using the GMAC.
 		 * Check the summary status.
@@ -3056,6 +3098,8 @@ static irqreturn_t mvpp2_port_isr(int irq, void *dev_id)
 		val = readl(port->base + MVPP22_GMAC_INT_SUM_STAT);
 		if (val & MVPP22_GMAC_INT_SUM_STAT_INTERNAL)
 			mvpp2_isr_handle_gmac_internal(port);
+		if (val & MVPP22_GMAC_INT_SUM_STAT_PTP)
+			mvpp2_isr_handle_ptp(port);
 	}
 
 	mvpp22_gop_unmask_irq(port);
-- 
2.20.1

[PATCH net-next 7/7] net: mvpp2: ptp: add support for transmit timestamping

[Russell King]

Add support for timestamping transmit packets.  We allocate SYNC
messages to queue 1, every other message to queue 0.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    |  48 +++++-
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 155 ++++++++++++++++--
 2 files changed, 192 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 50956551b336..834775843067 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -12,6 +12,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
+#include <linux/net_tstamp.h>
 #include <linux/phy.h>
 #include <linux/phylink.h>
 #include <net/flow_offload.h>
@@ -804,6 +805,43 @@ enum mvpp2_prs_l3_cast {
 	MVPP2_PRS_L3_BROAD_CAST
 };
 
+/* PTP descriptor constants. The low bits of the descriptor are stored
+ * separately from the high bits.
+ */
+#define MVPP22_PTP_DESC_MASK_LOW	0xfff
+
+/* PTPAction */
+enum mvpp22_ptp_action {
+	MVPP22_PTP_ACTION_NONE = 0,
+	MVPP22_PTP_ACTION_FORWARD = 1,
+	MVPP22_PTP_ACTION_CAPTURE = 3,
+	/* The following have not been verified */
+	MVPP22_PTP_ACTION_ADDTIME = 4,
+	MVPP22_PTP_ACTION_ADDCORRECTEDTIME = 5,
+	MVPP22_PTP_ACTION_CAPTUREADDTIME = 6,
+	MVPP22_PTP_ACTION_CAPTUREADDCORRECTEDTIME = 7,
+	MVPP22_PTP_ACTION_ADDINGRESSTIME = 8,
+	MVPP22_PTP_ACTION_CAPTUREADDINGRESSTIME = 9,
+	MVPP22_PTP_ACTION_CAPTUREINGRESSTIME = 10,
+};
+
+/* PTPPacketFormat */
+enum mvpp22_ptp_packet_format {
+	MVPP22_PTP_PKT_FMT_PTPV2 = 0,
+	MVPP22_PTP_PKT_FMT_PTPV1 = 1,
+	MVPP22_PTP_PKT_FMT_Y1731 = 2,
+	MVPP22_PTP_PKT_FMT_NTPTS = 3,
+	MVPP22_PTP_PKT_FMT_NTPRX = 4,
+	MVPP22_PTP_PKT_FMT_NTPTX = 5,
+	MVPP22_PTP_PKT_FMT_TWAMP = 6,
+};
+
+#define MVPP22_PTP_ACTION(x)		(((x) & 15) << 0)
+#define MVPP22_PTP_PACKETFORMAT(x)	(((x) & 7) << 4)
+#define MVPP22_PTP_MACTIMESTAMPINGEN	BIT(11)
+#define MVPP22_PTP_TIMESTAMPENTRYID(x)	(((x) & 31) << 12)
+#define MVPP22_PTP_TIMESTAMPQUEUESELECT	BIT(18)
+
 /* BM constants */
 #define MVPP2_BM_JUMBO_BUF_NUM		512
 #define MVPP2_BM_LONG_BUF_NUM		1024
@@ -1022,6 +1060,11 @@ struct mvpp2_ethtool_fs {
 	struct ethtool_rxnfc rxnfc;
 };
 
+struct mvpp2_hwtstamp_queue {
+	struct sk_buff *skb[32];
+	u8 next;
+};
+
 struct mvpp2_port {
 	u8 id;
 
@@ -1108,6 +1151,8 @@ struct mvpp2_port {
 
 	bool hwtstamp;
 	bool rx_hwtstamp;
+	enum hwtstamp_tx_types tx_hwtstamp_type;
+	struct mvpp2_hwtstamp_queue tx_hwtstamp_queue[2];
 };
 
 /* The mvpp2_tx_desc and mvpp2_rx_desc structures describe the
@@ -1176,7 +1221,8 @@ struct mvpp22_tx_desc {
 	u8  packet_offset;
 	u8  phys_txq;
 	__le16 data_size;
-	__le64 reserved1;
+	__le32 ptp_descriptor;
+	__le32 reserved2;
 	__le64 buf_dma_addr_ptp;
 	__le64 buf_cookie_misc;
 };
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index f3148e033bfe..7130e31c7431 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -28,6 +28,7 @@
 #include <linux/phy.h>
 #include <linux/phylink.h>
 #include <linux/phy/phy.h>
+#include <linux/ptp_classify.h>
 #include <linux/clk.h>
 #include <linux/hrtimer.h>
 #include <linux/ktime.h>
@@ -2984,13 +2985,19 @@ static irqreturn_t mvpp2_isr(int irq, void *dev_id)
 
 static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
 {
+	struct skb_shared_hwtstamps shhwtstamps;
+	struct mvpp2_hwtstamp_queue *queue;
+	struct sk_buff *skb;
 	void __iomem *ptp_q;
+	unsigned int id;
 	u32 r0, r1, r2;
 
 	ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
 	if (nq)
 		ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
 
+	queue = &port->tx_hwtstamp_queue[nq];
+
 	while (1) {
 		r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
 		if (!r0)
@@ -2998,6 +3005,18 @@ static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
 
 		r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
 		r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
+
+		id = (r0 >> 1) & 31;
+
+		skb = queue->skb[id];
+		queue->skb[id] = NULL;
+		if (skb) {
+			u32 ts = r2 << 19 | r1 << 3 | r0 >> 13;
+
+			mvpp22_tai_tstamp(port->priv->tai, ts, &shhwtstamps);
+			skb_tstamp_tx(skb, &shhwtstamps);
+			dev_kfree_skb_any(skb);
+		}
 	}
 }
 
@@ -3654,6 +3673,92 @@ tx_desc_unmap_put(struct mvpp2_port *port, struct mvpp2_tx_queue *txq,
 	mvpp2_txq_desc_put(txq);
 }
 
+static void mvpp2_txdesc_clear_ptp(struct mvpp2_port *port,
+				   struct mvpp2_tx_desc *desc)
+{
+	/* We only need to clear the low bits */
+	if (port->priv->hw_version != MVPP21)
+		desc->pp22.ptp_descriptor &=
+			cpu_to_le32(~MVPP22_PTP_DESC_MASK_LOW);
+}
+
+static bool mvpp2_tx_hw_tstamp(struct mvpp2_port *port,
+			       struct mvpp2_tx_desc *tx_desc,
+			       struct sk_buff *skb)
+{
+	struct mvpp2_hwtstamp_queue *queue;
+	unsigned int mtype, type, i;
+	struct ptp_header *hdr;
+	u64 ptpdesc;
+
+	if (port->priv->hw_version == MVPP21 ||
+	    port->tx_hwtstamp_type == HWTSTAMP_TX_OFF)
+		return false;
+
+	type = ptp_classify_raw(skb);
+	if (!type)
+		return false;
+
+	hdr = ptp_parse_header(skb, type);
+	if (!hdr)
+		return false;
+
+	ptpdesc = MVPP22_PTP_MACTIMESTAMPINGEN |
+		  MVPP22_PTP_ACTION_CAPTURE;
+	queue = &port->tx_hwtstamp_queue[0];
+
+	switch (type & PTP_CLASS_VMASK) {
+	case PTP_CLASS_V1:
+		ptpdesc |= MVPP22_PTP_PACKETFORMAT(MVPP22_PTP_PKT_FMT_PTPV1);
+		break;
+
+	case PTP_CLASS_V2:
+		ptpdesc |= MVPP22_PTP_PACKETFORMAT(MVPP22_PTP_PKT_FMT_PTPV2);
+		mtype = hdr->tsmt & 15;
+		/* Direct PTP Sync messages to queue 1 */
+		if (mtype == 0) {
+			ptpdesc |= MVPP22_PTP_TIMESTAMPQUEUESELECT;
+			queue = &port->tx_hwtstamp_queue[1];
+		}
+		break;
+	}
+
+	/* Take a reference on the skb and insert into our queue */
+	i = queue->next;
+	queue->next = (i + 1) & 31;
+	if (queue->skb[i])
+		dev_kfree_skb_any(queue->skb[i]);
+	queue->skb[i] = skb_get(skb);
+
+	ptpdesc |= MVPP22_PTP_TIMESTAMPENTRYID(i);
+
+	/*
+	 * 3:0		- PTPAction
+	 * 6:4		- PTPPacketFormat
+	 * 7		- PTP_CF_WraparoundCheckEn
+	 * 9:8		- IngressTimestampSeconds[1:0]
+	 * 10		- Reserved
+	 * 11		- MACTimestampingEn
+	 * 17:12	- PTP_TimestampQueueEntryID[5:0]
+	 * 18		- PTPTimestampQueueSelect
+	 * 19		- UDPChecksumUpdateEn
+	 * 27:20	- TimestampOffset
+	 *			PTP, NTPTransmit, OWAMP/TWAMP - L3 to PTP header
+	 *			NTPTs, Y.1731 - L3 to timestamp entry
+	 * 35:28	- UDP Checksum Offset
+	 *
+	 * stored in tx descriptor bits 75:64 (11:0) and 191:168 (35:12)
+	 */
+	tx_desc->pp22.ptp_descriptor &=
+		cpu_to_le32(~MVPP22_PTP_DESC_MASK_LOW);
+	tx_desc->pp22.ptp_descriptor |=
+		cpu_to_le32(ptpdesc & MVPP22_PTP_DESC_MASK_LOW);
+	tx_desc->pp22.buf_dma_addr_ptp &= cpu_to_le64(~0xffffff0000000000ULL);
+	tx_desc->pp22.buf_dma_addr_ptp |= cpu_to_le64((ptpdesc >> 12) << 40);
+
+	return true;
+}
+
 /* Handle tx fragmentation processing */
 static int mvpp2_tx_frag_process(struct mvpp2_port *port, struct sk_buff *skb,
 				 struct mvpp2_tx_queue *aggr_txq,
@@ -3670,6 +3775,7 @@ static int mvpp2_tx_frag_process(struct mvpp2_port *port, struct sk_buff *skb,
 		void *addr = skb_frag_address(frag);
 
 		tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
+		mvpp2_txdesc_clear_ptp(port, tx_desc);
 		mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
 		mvpp2_txdesc_size_set(port, tx_desc, skb_frag_size(frag));
 
@@ -3719,6 +3825,7 @@ static inline void mvpp2_tso_put_hdr(struct sk_buff *skb,
 	struct mvpp2_tx_desc *tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
 	dma_addr_t addr;
 
+	mvpp2_txdesc_clear_ptp(port, tx_desc);
 	mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
 	mvpp2_txdesc_size_set(port, tx_desc, hdr_sz);
 
@@ -3743,6 +3850,7 @@ static inline int mvpp2_tso_put_data(struct sk_buff *skb,
 	struct mvpp2_tx_desc *tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
 	dma_addr_t buf_dma_addr;
 
+	mvpp2_txdesc_clear_ptp(port, tx_desc);
 	mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
 	mvpp2_txdesc_size_set(port, tx_desc, sz);
 
@@ -3859,6 +3967,9 @@ static netdev_tx_t mvpp2_tx(struct sk_buff *skb, struct net_device *dev)
 
 	/* Get a descriptor for the first part of the packet */
 	tx_desc = mvpp2_txq_next_desc_get(aggr_txq);
+	if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ||
+	    !mvpp2_tx_hw_tstamp(port, tx_desc, skb))
+		mvpp2_txdesc_clear_ptp(port, tx_desc);
 	mvpp2_txdesc_txq_set(port, tx_desc, txq->id);
 	mvpp2_txdesc_size_set(port, tx_desc, skb_headlen(skb));
 
@@ -4618,6 +4729,7 @@ static int mvpp2_set_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
 {
 	struct hwtstamp_config config;
 	void __iomem *ptp;
+	u32 gcr, int_mask;
 
 	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 		return -EFAULT;
@@ -4625,30 +4737,51 @@ static int mvpp2_set_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
 	if (config.flags)
 		return -EINVAL;
 
-	if (config.tx_type != HWTSTAMP_TX_OFF)
+	if (config.tx_type != HWTSTAMP_TX_OFF &&
+	    config.tx_type != HWTSTAMP_TX_ON)
 		return -ERANGE;
 
 	ptp = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
+
+	int_mask = gcr = 0;
+	if (config.tx_type != HWTSTAMP_TX_OFF) {
+		gcr |= MVPP22_PTP_GCR_TSU_ENABLE | MVPP22_PTP_GCR_TX_RESET;
+		int_mask |= MVPP22_PTP_INT_MASK_QUEUE1 |
+			    MVPP22_PTP_INT_MASK_QUEUE0;
+	}
+
+	/* It seems we must also release the TX reset when enabling the TSU */
+	if (config.rx_filter != HWTSTAMP_FILTER_NONE)
+		gcr |= MVPP22_PTP_GCR_TSU_ENABLE | MVPP22_PTP_GCR_RX_RESET |
+		       MVPP22_PTP_GCR_TX_RESET;
+
+	if (gcr & MVPP22_PTP_GCR_TSU_ENABLE)
+		mvpp22_tai_start(port->priv->tai);
+
 	if (config.rx_filter != HWTSTAMP_FILTER_NONE) {
 		config.rx_filter = HWTSTAMP_FILTER_ALL;
-		mvpp22_tai_start(port->priv->tai);
 		mvpp2_modify(ptp + MVPP22_PTP_GCR,
 			     MVPP22_PTP_GCR_RX_RESET |
 			     MVPP22_PTP_GCR_TX_RESET |
-			     MVPP22_PTP_GCR_TSU_ENABLE,
-			     MVPP22_PTP_GCR_RX_RESET |
-			     MVPP22_PTP_GCR_TX_RESET |
-			     MVPP22_PTP_GCR_TSU_ENABLE);
+			     MVPP22_PTP_GCR_TSU_ENABLE, gcr);
 		port->rx_hwtstamp = true;
 	} else {
 		port->rx_hwtstamp = false;
 		mvpp2_modify(ptp + MVPP22_PTP_GCR,
 			     MVPP22_PTP_GCR_RX_RESET |
 			     MVPP22_PTP_GCR_TX_RESET |
-			     MVPP22_PTP_GCR_TSU_ENABLE, 0);
-		mvpp22_tai_stop(port->priv->tai);
+			     MVPP22_PTP_GCR_TSU_ENABLE, gcr);
 	}
 
+	mvpp2_modify(ptp + MVPP22_PTP_INT_MASK,
+		     MVPP22_PTP_INT_MASK_QUEUE1 |
+		     MVPP22_PTP_INT_MASK_QUEUE0, int_mask);
+
+	if (!(gcr & MVPP22_PTP_GCR_TSU_ENABLE))
+		mvpp22_tai_stop(port->priv->tai);
+
+	port->tx_hwtstamp_type = config.tx_type;
+
 	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
 		return -EFAULT;
 
@@ -4661,7 +4794,7 @@ static int mvpp2_get_ts_config(struct mvpp2_port *port, struct ifreq *ifr)
 
 	memset(&config, 0, sizeof(config));
 
-	config.tx_type = HWTSTAMP_TX_OFF;
+	config.tx_type = port->tx_hwtstamp_type;
 	config.rx_filter = port->rx_hwtstamp ?
 		HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE;
 
@@ -4683,9 +4816,11 @@ static int mvpp2_ethtool_get_ts_info(struct net_device *dev,
 	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
 				SOF_TIMESTAMPING_RX_SOFTWARE |
 				SOF_TIMESTAMPING_SOFTWARE |
+				SOF_TIMESTAMPING_TX_HARDWARE |
 				SOF_TIMESTAMPING_RX_HARDWARE |
 				SOF_TIMESTAMPING_RAW_HARDWARE;
-	info->tx_types = BIT(HWTSTAMP_TX_OFF);
+	info->tx_types = BIT(HWTSTAMP_TX_OFF) |
+			 BIT(HWTSTAMP_TX_ON);
 	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
 			   BIT(HWTSTAMP_FILTER_ALL);
 
-- 
2.20.1

Re: [PATCH net-next 1/7] net: mvpp2: restructure "link status" interrupt handling

[Andrew Lunn]

On Wed, Sep 02, 2020 at 05:11:35PM +0100, Russell King wrote:
> The "link status" interrupt is used for more than just link status.
> Restructure mvpp2_link_status_isr() so we can add additional handling.
> 
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

I don't particularly know this code, so it would be good to get others
to review it as well, but.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next 2/7] net: mvpp2: rename mis-named "link status" interrupt

[Andrew Lunn]

On Wed, Sep 02, 2020 at 05:11:41PM +0100, Russell King wrote:
> The link interrupt is used for way more than just the link status; it
> comes from a collection of units to do with the port. The Marvell
> documentation describes the interrupt as "GOP port X interrupt".
> 
> Since we are adding PTP support, and the PTP interrupt uses this,
> rename it to be more inline with the documentation.
> 
> This interrupt is also mis-named in the DT binding, but we leave that
> alone.
> 
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next 3/7] net: mvpp2: check first level interrupt status registers

[Andrew Lunn]

On Wed, Sep 02, 2020 at 05:11:46PM +0100, Russell King wrote:
> Check the first level interrupt status registers to determine how to
> further process the port interrupt. We will need this to know whether
> to invoke the link status processing and/or the PTP processing for
> both XLG and GMAC.

As i said, i don't know this driver. Does the hardware actually have
two MAC hardware blocks? One for 10Mbs->1G, and a second for > 1G?

The comments and code seem to fit, so:

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next 6/7] net: mvpp2: ptp: add interrupt handling

[Andrew Lunn]

> +static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
> +{
> +	void __iomem *ptp_q;
> +	u32 r0, r1, r2;
> +
> +	ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
> +	if (nq)
> +		ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
> +
> +	while (1) {
> +		r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
> +		if (!r0)
> +			break;
> +
> +		r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
> +		r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
> +	}
> +}

Hi Russell

That is a rather odd interrupt handler, basically throwing everything
away. Maybe add a comment about what is going on?

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next 6/7] net: mvpp2: ptp: add interrupt handling

[Russell King - ARM Linux admin]

On Thu, Sep 03, 2020 at 03:39:40AM +0200, Andrew Lunn wrote:
> > +static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
> > +{
> > +	void __iomem *ptp_q;
> > +	u32 r0, r1, r2;
> > +
> > +	ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
> > +	if (nq)
> > +		ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
> > +
> > +	while (1) {
> > +		r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
> > +		if (!r0)
> > +			break;
> > +
> > +		r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
> > +		r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
> > +	}
> > +}
> 
> Hi Russell
> 
> That is a rather odd interrupt handler, basically throwing everything
> away. Maybe add a comment about what is going on?

We end up doing something with it in the following patch. I could
squash 6 and 7 together, which would avoid this.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

Re: [PATCH net-next 6/7] net: mvpp2: ptp: add interrupt handling

[Andrew Lunn]

On Thu, Sep 03, 2020 at 09:48:16AM +0100, Russell King - ARM Linux admin wrote:
> On Thu, Sep 03, 2020 at 03:39:40AM +0200, Andrew Lunn wrote:
> > > +static void mvpp2_isr_handle_ptp_queue(struct mvpp2_port *port, int nq)
> > > +{
> > > +	void __iomem *ptp_q;
> > > +	u32 r0, r1, r2;
> > > +
> > > +	ptp_q = port->priv->iface_base + MVPP22_PTP_BASE(port->gop_id);
> > > +	if (nq)
> > > +		ptp_q += MVPP22_PTP_TX_Q1_R0 - MVPP22_PTP_TX_Q0_R0;
> > > +
> > > +	while (1) {
> > > +		r0 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R0) & 0xffff;
> > > +		if (!r0)
> > > +			break;
> > > +
> > > +		r1 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R1) & 0xffff;
> > > +		r2 = readl_relaxed(ptp_q + MVPP22_PTP_TX_Q0_R2) & 0xffff;
> > > +	}
> > > +}
> > 
> > Hi Russell
> > 
> > That is a rather odd interrupt handler, basically throwing everything
> > away. Maybe add a comment about what is going on?
> 
> We end up doing something with it in the following patch. I could
> squash 6 and 7 together, which would avoid this.

Hi Russell

Yes, i noticed this when i get to the next patch. Please either squash
it, or add something to the commit message that the following patches
will flesh the function out some more.

Thanks
      Andrew

Re: [PATCH net-next 3/7] net: mvpp2: check first level interrupt status registers

[Russell King - ARM Linux admin]

On Thu, Sep 03, 2020 at 03:24:14AM +0200, Andrew Lunn wrote:
> On Wed, Sep 02, 2020 at 05:11:46PM +0100, Russell King wrote:
> > Check the first level interrupt status registers to determine how to
> > further process the port interrupt. We will need this to know whether
> > to invoke the link status processing and/or the PTP processing for
> > both XLG and GMAC.
> 
> As i said, i don't know this driver. Does the hardware actually have
> two MAC hardware blocks? One for 10Mbs->1G, and a second for > 1G?

Yes.

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RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!