Merge branch 'PTP-support-for-DSA-and-mv88e6xxx-driver'

Andrew Lunn says:

====================
PTP support for DSA and mv88e6xxx driver.

This patchset adds support for using the PTP hardware in switches
supported by the mv88e6xxx driver. The code was produces in
collaboration with Brandon Streiff doing the initial implementation,
and then Richard Cochran and Andrew Lunn making further changes and
cleanups.

The code is sufficient to use ptp4l on a single DSA interface, either
as a master or a slave. Due to the use of an MDIO bus to access the
switch, reading hardware timestamps is slower than what ptp4l
expects. Thus it is necessary to use the option
--tx_timestamp_timeout=32. Heavy use of ethtool -S, or bridge fdb show
can also upset ptp4l. Patches to address this will follow.

Further work is requires to support bridges using Boundary Clock or
Transparent Clock mode.

Since the RFC, an overflow bug has been fixed. Brandon Streiff
has also Acked-by: the updates to his initial patchset.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/Kconfig

@@ -18,3 +18,13 @@ config NET_DSA_MV88E6XXX_GLOBAL2
 
 	  It is required on most chips. If the chip you compile the support for
 	  doesn't have such registers set, say N here. In doubt, say Y.
+
+config NET_DSA_MV88E6XXX_PTP
+	bool "PTP support for Marvell 88E6xxx"
+	default n
+	depends on NET_DSA_MV88E6XXX_GLOBAL2
+	imply NETWORK_PHY_TIMESTAMPING
+	imply PTP_1588_CLOCK
+	help
+	  Say Y to enable PTP hardware timestamping on Marvell 88E6xxx switch
+	  chips that support it.

drivers/net/dsa/mv88e6xxx/Makefile

@@ -5,6 +5,10 @@ mv88e6xxx-objs += global1.o
 mv88e6xxx-objs += global1_atu.o
 mv88e6xxx-objs += global1_vtu.o
 mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2.o
+mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2_avb.o
+mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2_scratch.o
+mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += hwtstamp.o
 mv88e6xxx-objs += phy.o
 mv88e6xxx-objs += port.o
+mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
 mv88e6xxx-objs += serdes.o

drivers/net/dsa/mv88e6xxx/chip.h

@@ -16,6 +16,8 @@
 #include <linux/irq.h>
 #include <linux/gpio/consumer.h>
 #include <linux/phy.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/timecounter.h>
 #include <net/dsa.h>
 
 #ifndef UINT64_MAX
@@ -39,6 +41,8 @@
 #define MV88E6XXX_MAX_PVT_SWITCHES	32
 #define MV88E6XXX_MAX_PVT_PORTS		16
 
+#define MV88E6XXX_MAX_GPIO	16
+
 enum mv88e6xxx_egress_mode {
 	MV88E6XXX_EGRESS_MODE_UNMODIFIED,
 	MV88E6XXX_EGRESS_MODE_UNTAGGED,
@@ -105,6 +109,7 @@ struct mv88e6xxx_info {
 	const char *name;
 	unsigned int num_databases;
 	unsigned int num_ports;
+	unsigned int num_gpio;
 	unsigned int max_vid;
 	unsigned int port_base_addr;
 	unsigned int global1_addr;
@@ -126,6 +131,9 @@ struct mv88e6xxx_info {
 	 */
 	u8 atu_move_port_mask;
 	const struct mv88e6xxx_ops *ops;
+
+	/* Supports PTP */
+	bool ptp_support;
 };
 
 struct mv88e6xxx_atu_entry {
@@ -146,6 +154,8 @@ struct mv88e6xxx_vtu_entry {
 
 struct mv88e6xxx_bus_ops;
 struct mv88e6xxx_irq_ops;
+struct mv88e6xxx_gpio_ops;
+struct mv88e6xxx_avb_ops;
 
 struct mv88e6xxx_irq {
 	u16 masked;
@@ -154,6 +164,32 @@ struct mv88e6xxx_irq {
 	unsigned int nirqs;
 };
 
+/* state flags for mv88e6xxx_port_hwtstamp::state */
+enum {
+	MV88E6XXX_HWTSTAMP_ENABLED,
+	MV88E6XXX_HWTSTAMP_TX_IN_PROGRESS,
+};
+
+struct mv88e6xxx_port_hwtstamp {
+	/* Port index */
+	int port_id;
+
+	/* Timestamping state */
+	unsigned long state;
+
+	/* Resources for receive timestamping */
+	struct sk_buff_head rx_queue;
+	struct sk_buff_head rx_queue2;
+
+	/* Resources for transmit timestamping */
+	unsigned long tx_tstamp_start;
+	struct sk_buff *tx_skb;
+	u16 tx_seq_id;
+
+	/* Current timestamp configuration */
+	struct hwtstamp_config tstamp_config;
+};
+
 struct mv88e6xxx_chip {
 	const struct mv88e6xxx_info *info;
 
@@ -209,6 +245,26 @@ struct mv88e6xxx_chip {
 	int watchdog_irq;
 	int atu_prob_irq;
 	int vtu_prob_irq;
+
+	/* GPIO resources */
+	u8 gpio_data[2];
+
+	/* This cyclecounter abstracts the switch PTP time.
+	 * reg_lock must be held for any operation that read()s.
+	 */
+	struct cyclecounter	tstamp_cc;
+	struct timecounter	tstamp_tc;
+	struct delayed_work	overflow_work;
+
+	struct ptp_clock	*ptp_clock;
+	struct ptp_clock_info	ptp_clock_info;
+	struct delayed_work	tai_event_work;
+	struct ptp_pin_desc	pin_config[MV88E6XXX_MAX_GPIO];
+	u16 trig_config;
+	u16 evcap_config;
+
+	/* Per-port timestamping resources. */
+	struct mv88e6xxx_port_hwtstamp port_hwtstamp[DSA_MAX_PORTS];
 };
 
 struct mv88e6xxx_bus_ops {
@@ -344,6 +400,12 @@ struct mv88e6xxx_ops {
 			   struct mv88e6xxx_vtu_entry *entry);
 	int (*vtu_loadpurge)(struct mv88e6xxx_chip *chip,
 			     struct mv88e6xxx_vtu_entry *entry);
+
+	/* GPIO operations */
+	const struct mv88e6xxx_gpio_ops *gpio_ops;
+
+	/* Interface to the AVB/PTP registers */
+	const struct mv88e6xxx_avb_ops *avb_ops;
 };
 
 struct mv88e6xxx_irq_ops {
@@ -355,6 +417,42 @@ struct mv88e6xxx_irq_ops {
 	void (*irq_free)(struct mv88e6xxx_chip *chip);
 };
 
+struct mv88e6xxx_gpio_ops {
+	/* Get/set data on GPIO pin */
+	int (*get_data)(struct mv88e6xxx_chip *chip, unsigned int pin);
+	int (*set_data)(struct mv88e6xxx_chip *chip, unsigned int pin,
+			int value);
+
+	/* get/set GPIO direction */
+	int (*get_dir)(struct mv88e6xxx_chip *chip, unsigned int pin);
+	int (*set_dir)(struct mv88e6xxx_chip *chip, unsigned int pin,
+		       bool input);
+
+	/* get/set GPIO pin control */
+	int (*get_pctl)(struct mv88e6xxx_chip *chip, unsigned int pin,
+			int *func);
+	int (*set_pctl)(struct mv88e6xxx_chip *chip, unsigned int pin,
+			int func);
+};
+
+struct mv88e6xxx_avb_ops {
+	/* Access port-scoped Precision Time Protocol registers */
+	int (*port_ptp_read)(struct mv88e6xxx_chip *chip, int port, int addr,
+			     u16 *data, int len);
+	int (*port_ptp_write)(struct mv88e6xxx_chip *chip, int port, int addr,
+			      u16 data);
+
+	/* Access global Precision Time Protocol registers */
+	int (*ptp_read)(struct mv88e6xxx_chip *chip, int addr, u16 *data,
+			int len);
+	int (*ptp_write)(struct mv88e6xxx_chip *chip, int addr, u16 data);
+
+	/* Access global Time Application Interface registers */
+	int (*tai_read)(struct mv88e6xxx_chip *chip, int addr, u16 *data,
+			int len);
+	int (*tai_write)(struct mv88e6xxx_chip *chip, int addr, u16 data);
+};
+
 #define STATS_TYPE_PORT		BIT(0)
 #define STATS_TYPE_BANK0	BIT(1)
 #define STATS_TYPE_BANK1	BIT(2)
@@ -386,6 +484,11 @@ static inline u16 mv88e6xxx_port_mask(struct mv88e6xxx_chip *chip)
 	return GENMASK(mv88e6xxx_num_ports(chip) - 1, 0);
 }
 
+static inline unsigned int mv88e6xxx_num_gpio(struct mv88e6xxx_chip *chip)
+{
+	return chip->info->num_gpio;
+}
+
 int mv88e6xxx_read(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val);
 int mv88e6xxx_write(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
 int mv88e6xxx_update(struct mv88e6xxx_chip *chip, int addr, int reg,

drivers/net/dsa/mv88e6xxx/global2.c

@@ -20,22 +20,22 @@
 #include "global1.h" /* for MV88E6XXX_G1_STS_IRQ_DEVICE */
 #include "global2.h"
 
-static int mv88e6xxx_g2_read(struct mv88e6xxx_chip *chip, int reg, u16 *val)
+int mv88e6xxx_g2_read(struct mv88e6xxx_chip *chip, int reg, u16 *val)
 {
 	return mv88e6xxx_read(chip, chip->info->global2_addr, reg, val);
 }
 
-static int mv88e6xxx_g2_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
+int mv88e6xxx_g2_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
 {
 	return mv88e6xxx_write(chip, chip->info->global2_addr, reg, val);
 }
 
-static int mv88e6xxx_g2_update(struct mv88e6xxx_chip *chip, int reg, u16 update)
+int mv88e6xxx_g2_update(struct mv88e6xxx_chip *chip, int reg, u16 update)
 {
 	return mv88e6xxx_update(chip, chip->info->global2_addr, reg, update);
 }
 
-static int mv88e6xxx_g2_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
+int mv88e6xxx_g2_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
 {
 	return mv88e6xxx_wait(chip, chip->info->global2_addr, reg, mask);
 }
@@ -798,6 +798,7 @@ int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
 						   val);
 }
 
+/* Offset 0x1B: Watchdog Control */
 static int mv88e6097_watchdog_action(struct mv88e6xxx_chip *chip, int irq)
 {
 	u16 reg;

drivers/net/dsa/mv88e6xxx/global2.h

@@ -149,7 +149,26 @@
 #define MV88E6390_G2_EEPROM_ADDR_MASK	0xffff
 
 /* Offset 0x16: AVB Command Register */
-#define MV88E6352_G2_AVB_CMD		0x16
+#define MV88E6352_G2_AVB_CMD			0x16
+#define MV88E6352_G2_AVB_CMD_BUSY		0x8000
+#define MV88E6352_G2_AVB_CMD_OP_READ		0x4000
+#define MV88E6352_G2_AVB_CMD_OP_READ_INCR	0x6000
+#define MV88E6352_G2_AVB_CMD_OP_WRITE		0x3000
+#define MV88E6390_G2_AVB_CMD_OP_READ		0x0000
+#define MV88E6390_G2_AVB_CMD_OP_READ_INCR	0x4000
+#define MV88E6390_G2_AVB_CMD_OP_WRITE		0x6000
+#define MV88E6352_G2_AVB_CMD_PORT_MASK		0x0f00
+#define MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL	0xe
+#define MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL	0xf
+#define MV88E6390_G2_AVB_CMD_PORT_MASK		0x1f00
+#define MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL	0x1e
+#define MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL	0x1f
+#define MV88E6352_G2_AVB_CMD_BLOCK_PTP		0
+#define MV88E6352_G2_AVB_CMD_BLOCK_AVB		1
+#define MV88E6352_G2_AVB_CMD_BLOCK_QAV		2
+#define MV88E6352_G2_AVB_CMD_BLOCK_QVB		3
+#define MV88E6352_G2_AVB_CMD_BLOCK_MASK		0x00e0
+#define MV88E6352_G2_AVB_CMD_ADDR_MASK		0x001f
 
 /* Offset 0x17: AVB Data Register */
 #define MV88E6352_G2_AVB_DATA		0x17
@@ -223,6 +242,35 @@
 #define MV88E6352_G2_NOEGR_POLICY	0x2000
 #define MV88E6390_G2_LAG_ID_4		0x2000
 
+/* Scratch/Misc registers accessed through MV88E6XXX_G2_SCRATCH_MISC */
+/* Offset 0x02: Misc Configuration */
+#define MV88E6352_G2_SCRATCH_MISC_CFG		0x02
+#define MV88E6352_G2_SCRATCH_MISC_CFG_NORMALSMI	0x80
+/* Offset 0x60-0x61: GPIO Configuration */
+#define MV88E6352_G2_SCRATCH_GPIO_CFG0		0x60
+#define MV88E6352_G2_SCRATCH_GPIO_CFG1		0x61
+/* Offset 0x62-0x63: GPIO Direction */
+#define MV88E6352_G2_SCRATCH_GPIO_DIR0		0x62
+#define MV88E6352_G2_SCRATCH_GPIO_DIR1		0x63
+#define MV88E6352_G2_SCRATCH_GPIO_DIR_OUT	0
+#define MV88E6352_G2_SCRATCH_GPIO_DIR_IN	1
+/* Offset 0x64-0x65: GPIO Data */
+#define MV88E6352_G2_SCRATCH_GPIO_DATA0		0x64
+#define MV88E6352_G2_SCRATCH_GPIO_DATA1		0x65
+/* Offset 0x68-0x6F: GPIO Pin Control */
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL0		0x68
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL1		0x69
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL2		0x6A
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL3		0x6B
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL4		0x6C
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL5		0x6D
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL6		0x6E
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL7		0x6F
+
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL_GPIO	0
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL_TRIG	1
+#define MV88E6352_G2_SCRATCH_GPIO_PCTL_EVREQ	2
+
 #ifdef CONFIG_NET_DSA_MV88E6XXX_GLOBAL2
 
 static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
@@ -230,6 +278,11 @@ static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
 	return 0;
 }
 
+int mv88e6xxx_g2_read(struct mv88e6xxx_chip *chip, int reg, u16 *val);
+int mv88e6xxx_g2_write(struct mv88e6xxx_chip *chip, int reg, u16 val);
+int mv88e6xxx_g2_update(struct mv88e6xxx_chip *chip, int reg, u16 update);
+int mv88e6xxx_g2_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask);
+
 int mv88e6352_g2_irl_init_all(struct mv88e6xxx_chip *chip, int port);
 int mv88e6390_g2_irl_init_all(struct mv88e6xxx_chip *chip, int port);
 
@@ -267,6 +320,11 @@ int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip);
 extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops;
 extern const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops;
 
+extern const struct mv88e6xxx_avb_ops mv88e6352_avb_ops;
+extern const struct mv88e6xxx_avb_ops mv88e6390_avb_ops;
+
+extern const struct mv88e6xxx_gpio_ops mv88e6352_gpio_ops;
+
 #else /* !CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
 static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
@@ -279,6 +337,26 @@ static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
 	return 0;
 }
 
+static int mv88e6xxx_g2_read(struct mv88e6xxx_chip *chip, int reg, u16 *val)
+{
+	return -EOPNOTSUPP;
+}
+
+static int mv88e6xxx_g2_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
+{
+	return -EOPNOTSUPP;
+}
+
+static int mv88e6xxx_g2_update(struct mv88e6xxx_chip *chip, int reg, u16 update)
+{
+	return -EOPNOTSUPP;
+}
+
+static int mv88e6xxx_g2_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int mv88e6352_g2_irl_init_all(struct mv88e6xxx_chip *chip,
 					    int port)
 {
@@ -382,6 +460,11 @@ static inline int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip)
 static const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops = {};
 static const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops = {};
 
+static const struct mv88e6xxx_avb_ops mv88e6352_avb_ops = {};
+static const struct mv88e6xxx_avb_ops mv88e6390_avb_ops = {};
+
+static const struct mv88e6xxx_gpio_ops mv88e6352_gpio_ops = {};
+
 #endif /* CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
 #endif /* _MV88E6XXX_GLOBAL2_H */

drivers/net/dsa/mv88e6xxx/global2_avb.c

+/*
+ * Marvell 88E6xxx Switch Global 2 Registers support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2016-2017 Savoir-faire Linux Inc.
+ *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
+ *
+ * Copyright (c) 2017 National Instruments
+ *	Brandon Streiff <brandon.streiff@ni.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "global2.h"
+
+/* Offset 0x16: AVB Command Register
+ * Offset 0x17: AVB Data Register
+ *
+ * There are two different versions of this register interface:
+ *    "6352": 3-bit "op" field, 4-bit "port" field.
+ *    "6390": 2-bit "op" field, 5-bit "port" field.
+ *
+ * The "op" codes are different between the two, as well as the special
+ * port fields for global PTP and TAI configuration.
+ */
+
+/* mv88e6xxx_g2_avb_read -- Read one or multiple 16-bit words.
+ * The hardware supports snapshotting up to four contiguous registers.
+ */
+static int mv88e6xxx_g2_avb_read(struct mv88e6xxx_chip *chip, u16 readop,
+				 u16 *data, int len)
+{
+	int err;
+	int i;
+
+	/* Hardware can only snapshot four words. */
+	if (len > 4)
+		return -E2BIG;
+
+	err = mv88e6xxx_g2_update(chip, MV88E6352_G2_AVB_CMD, readop);
+	if (err)
+		return err;
+
+	for (i = 0; i < len; ++i) {
+		err = mv88e6xxx_g2_read(chip, MV88E6352_G2_AVB_DATA,
+					&data[i]);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+/* mv88e6xxx_g2_avb_write -- Write one 16-bit word. */
+static int mv88e6xxx_g2_avb_write(struct mv88e6xxx_chip *chip, u16 writeop,
+				  u16 data)
+{
+	int err;
+
+	err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_DATA, data);
+	if (err)
+		return err;
+
+	return mv88e6xxx_g2_update(chip, MV88E6352_G2_AVB_CMD, writeop);
+}
+
+static int mv88e6352_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
+					  int port, int addr, u16 *data,
+					  int len)
+{
+	u16 readop = (len == 1 ? MV88E6352_G2_AVB_CMD_OP_READ :
+				 MV88E6352_G2_AVB_CMD_OP_READ_INCR) |
+		     (port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
+		     addr;
+
+	return mv88e6xxx_g2_avb_read(chip, readop, data, len);
+}
+
+static int mv88e6352_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
+					   int port, int addr, u16 data)
+{
+	u16 writeop = MV88E6352_G2_AVB_CMD_OP_WRITE | (port << 8) |
+		      (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
+
+	return mv88e6xxx_g2_avb_write(chip, writeop, data);
+}
+
+static int mv88e6352_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
+				     u16 *data, int len)
+{
+	return mv88e6352_g2_avb_port_ptp_read(chip,
+					MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
+					addr, data, len);
+}
+
+static int mv88e6352_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
+				      u16 data)
+{
+	return mv88e6352_g2_avb_port_ptp_write(chip,
+					MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
+					addr, data);
+}
+
+static int mv88e6352_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
+				     u16 *data, int len)
+{
+	return mv88e6352_g2_avb_port_ptp_read(chip,
+					MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
+					addr, data, len);
+}
+
+static int mv88e6352_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
+				      u16 data)
+{
+	return mv88e6352_g2_avb_port_ptp_write(chip,
+					MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
+					addr, data);
+}
+
+const struct mv88e6xxx_avb_ops mv88e6352_avb_ops = {
+	.port_ptp_read		= mv88e6352_g2_avb_port_ptp_read,
+	.port_ptp_write		= mv88e6352_g2_avb_port_ptp_write,
+	.ptp_read		= mv88e6352_g2_avb_ptp_read,
+	.ptp_write		= mv88e6352_g2_avb_ptp_write,
+	.tai_read		= mv88e6352_g2_avb_tai_read,
+	.tai_write		= mv88e6352_g2_avb_tai_write,
+};
+
+static int mv88e6390_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
+					  int port, int addr, u16 *data,
+					  int len)
+{
+	u16 readop = (len == 1 ? MV88E6390_G2_AVB_CMD_OP_READ :
+				 MV88E6390_G2_AVB_CMD_OP_READ_INCR) |
+		     (port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
+		     addr;
+
+	return mv88e6xxx_g2_avb_read(chip, readop, data, len);
+}
+
+static int mv88e6390_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
+					   int port, int addr, u16 data)
+{
+	u16 writeop = MV88E6390_G2_AVB_CMD_OP_WRITE | (port << 8) |
+		      (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
+
+	return mv88e6xxx_g2_avb_write(chip, writeop, data);
+}
+
+static int mv88e6390_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
+				     u16 *data, int len)
+{
+	return mv88e6390_g2_avb_port_ptp_read(chip,
+					MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
+					addr, data, len);
+}
+
+static int mv88e6390_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
+				      u16 data)
+{
+	return mv88e6390_g2_avb_port_ptp_write(chip,
+					MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
+					addr, data);
+}
+
+static int mv88e6390_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
+				     u16 *data, int len)
+{
+	return mv88e6390_g2_avb_port_ptp_read(chip,
+					MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
+					addr, data, len);
+}
+
+static int mv88e6390_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
+				      u16 data)
+{
+	return mv88e6390_g2_avb_port_ptp_write(chip,
+					MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
+					addr, data);
+}
+
+const struct mv88e6xxx_avb_ops mv88e6390_avb_ops = {
+	.port_ptp_read		= mv88e6390_g2_avb_port_ptp_read,
+	.port_ptp_write		= mv88e6390_g2_avb_port_ptp_write,
+	.ptp_read		= mv88e6390_g2_avb_ptp_read,
+	.ptp_write		= mv88e6390_g2_avb_ptp_write,
+	.tai_read		= mv88e6390_g2_avb_tai_read,
+	.tai_write		= mv88e6390_g2_avb_tai_write,
+};

drivers/net/dsa/mv88e6xxx/global2_scratch.c

+/*
+ * Marvell 88E6xxx Switch Global 2 Scratch & Misc Registers support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2017 National Instruments
+ *      Brandon Streiff <brandon.streiff@ni.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "chip.h"
+#include "global2.h"
+
+/* Offset 0x1A: Scratch and Misc. Register */
+static int mv88e6xxx_g2_scratch_read(struct mv88e6xxx_chip *chip, int reg,
+				     u8 *data)
+{
+	u16 value;
+	int err;
+
+	err = mv88e6xxx_g2_write(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC,
+				 reg << 8);
+	if (err)
+		return err;
+
+	err = mv88e6xxx_g2_read(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC, &value);
+	if (err)
+		return err;
+
+	*data = (value & MV88E6XXX_G2_SCRATCH_MISC_DATA_MASK);
+
+	return 0;
+}
+
+static int mv88e6xxx_g2_scratch_write(struct mv88e6xxx_chip *chip, int reg,
+				      u8 data)
+{
+	u16 value = (reg << 8) | data;
+
+	return mv88e6xxx_g2_update(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC, value);
+}
+
+/**
+ * mv88e6xxx_g2_scratch_gpio_get_bit - get a bit
+ * @chip: chip private data
+ * @nr: bit index
+ * @set: is bit set?
+ */
+static int mv88e6xxx_g2_scratch_get_bit(struct mv88e6xxx_chip *chip,
+					int base_reg, unsigned int offset,
+					int *set)
+{
+	int reg = base_reg + (offset / 8);
+	u8 mask = (1 << (offset & 0x7));
+	u8 val;
+	int err;
+
+	err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
+	if (err)
+		return err;
+
+	*set = !!(mask & val);
+
+	return 0;
+}
+
+/**
+ * mv88e6xxx_g2_scratch_gpio_set_bit - set (or clear) a bit
+ * @chip: chip private data
+ * @nr: bit index
+ * @set: set if true, clear if false
+ *
+ * Helper function for dealing with the direction and data registers.
+ */
+static int mv88e6xxx_g2_scratch_set_bit(struct mv88e6xxx_chip *chip,
+					int base_reg, unsigned int offset,
+					int set)
+{
+	int reg = base_reg + (offset / 8);
+	u8 mask = (1 << (offset & 0x7));
+	u8 val;
+	int err;
+
+	err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
+	if (err)
+		return err;
+
+	if (set)
+		val |= mask;
+	else
+		val &= ~mask;
+
+	return mv88e6xxx_g2_scratch_write(chip, reg, val);
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_get_data - get data on gpio pin
+ * @chip: chip private data
+ * @pin: gpio index
+ *
+ * Return: 0 for low, 1 for high, negative error
+ */
+static int mv88e6352_g2_scratch_gpio_get_data(struct mv88e6xxx_chip *chip,
+					      unsigned int pin)
+{
+	int val = 0;
+	int err;
+
+	err = mv88e6xxx_g2_scratch_get_bit(chip,
+					   MV88E6352_G2_SCRATCH_GPIO_DATA0,
+					   pin, &val);
+	if (err)
+		return err;
+
+	return val;
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_set_data - set data on gpio pin
+ * @chip: chip private data
+ * @pin: gpio index
+ * @value: value to set
+ */
+static int mv88e6352_g2_scratch_gpio_set_data(struct mv88e6xxx_chip *chip,
+					      unsigned int pin, int value)
+{
+	u8 mask = (1 << (pin & 0x7));
+	int offset = (pin / 8);
+	int reg;
+
+	reg = MV88E6352_G2_SCRATCH_GPIO_DATA0 + offset;
+
+	if (value)
+		chip->gpio_data[offset] |= mask;
+	else
+		chip->gpio_data[offset] &= ~mask;
+
+	return mv88e6xxx_g2_scratch_write(chip, reg, chip->gpio_data[offset]);
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_get_dir - get direction of gpio pin
+ * @chip: chip private data
+ * @pin: gpio index
+ *
+ * Return: 0 for output, 1 for input (same as GPIOF_DIR_XXX).
+ */
+static int mv88e6352_g2_scratch_gpio_get_dir(struct mv88e6xxx_chip *chip,
+					     unsigned int pin)
+{
+	int val = 0;
+	int err;
+
+	err = mv88e6xxx_g2_scratch_get_bit(chip,
+					   MV88E6352_G2_SCRATCH_GPIO_DIR0,
+					   pin, &val);
+	if (err)
+		return err;
+
+	return val;
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_set_dir - set direction of gpio pin
+ * @chip: chip private data
+ * @pin: gpio index
+ */
+static int mv88e6352_g2_scratch_gpio_set_dir(struct mv88e6xxx_chip *chip,
+					     unsigned int pin, bool input)
+{
+	int value = (input ? MV88E6352_G2_SCRATCH_GPIO_DIR_IN :
+			     MV88E6352_G2_SCRATCH_GPIO_DIR_OUT);
+
+	return mv88e6xxx_g2_scratch_set_bit(chip,
+					    MV88E6352_G2_SCRATCH_GPIO_DIR0,
+					    pin, value);
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_get_pctl - get pin control setting
+ * @chip: chip private data
+ * @pin: gpio index
+ * @func: function number
+ *
+ * Note that the function numbers themselves may vary by chipset.
+ */
+static int mv88e6352_g2_scratch_gpio_get_pctl(struct mv88e6xxx_chip *chip,
+					      unsigned int pin, int *func)
+{
+	int reg = MV88E6352_G2_SCRATCH_GPIO_PCTL0 + (pin / 2);
+	int offset = (pin & 0x1) ? 4 : 0;
+	u8 mask = (0x7 << offset);
+	int err;
+	u8 val;
+
+	err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
+	if (err)
+		return err;
+
+	*func = (val & mask) >> offset;
+
+	return 0;
+}
+
+/**
+ * mv88e6352_g2_scratch_gpio_set_pctl - set pin control setting
+ * @chip: chip private data
+ * @pin: gpio index
+ * @func: function number
+ */
+static int mv88e6352_g2_scratch_gpio_set_pctl(struct mv88e6xxx_chip *chip,
+					      unsigned int pin, int func)
+{
+	int reg = MV88E6352_G2_SCRATCH_GPIO_PCTL0 + (pin / 2);
+	int offset = (pin & 0x1) ? 4 : 0;
+	u8 mask = (0x7 << offset);
+	int err;
+	u8 val;
+
+	err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
+	if (err)
+		return err;
+
+	val = (val & ~mask) | ((func & mask) << offset);
+
+	return mv88e6xxx_g2_scratch_write(chip, reg, val);
+}
+
+const struct mv88e6xxx_gpio_ops mv88e6352_gpio_ops = {
+	.get_data = mv88e6352_g2_scratch_gpio_get_data,
+	.set_data = mv88e6352_g2_scratch_gpio_set_data,
+	.get_dir = mv88e6352_g2_scratch_gpio_get_dir,
+	.set_dir = mv88e6352_g2_scratch_gpio_set_dir,
+	.get_pctl = mv88e6352_g2_scratch_gpio_get_pctl,
+	.set_pctl = mv88e6352_g2_scratch_gpio_set_pctl,
+};

drivers/net/dsa/mv88e6xxx/hwtstamp.h

+/*
+ * Marvell 88E6xxx Switch hardware timestamping support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2017 National Instruments
+ *      Erik Hons <erik.hons@ni.com>
+ *      Brandon Streiff <brandon.streiff@ni.com>
+ *      Dane Wagner <dane.wagner@ni.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _MV88E6XXX_HWTSTAMP_H
+#define _MV88E6XXX_HWTSTAMP_H
+
+#include "chip.h"
+
+/* Global PTP registers */
+/* Offset 0x00: PTP EtherType */
+#define MV88E6XXX_PTP_ETHERTYPE	0x00
+
+/* Offset 0x01: Message Type Timestamp Enables */
+#define MV88E6XXX_PTP_MSGTYPE			0x01
+#define MV88E6XXX_PTP_MSGTYPE_SYNC		0x0001
+#define MV88E6XXX_PTP_MSGTYPE_DELAY_REQ		0x0002
+#define MV88E6XXX_PTP_MSGTYPE_PDLAY_REQ		0x0004
+#define MV88E6XXX_PTP_MSGTYPE_PDLAY_RES		0x0008
+#define MV88E6XXX_PTP_MSGTYPE_ALL_EVENT		0x000f
+
+/* Offset 0x02: Timestamp Arrival Capture Pointers */
+#define MV88E6XXX_PTP_TS_ARRIVAL_PTR	0x02
+
+/* Offset 0x07: PTP Global Configuration */
+#define MV88E6341_PTP_CFG			0x07
+#define MV88E6341_PTP_CFG_UPDATE		0x8000
+#define MV88E6341_PTP_CFG_IDX_MASK		0x7f00
+#define MV88E6341_PTP_CFG_DATA_MASK		0x00ff
+#define MV88E6341_PTP_CFG_MODE_IDX		0x0
+#define MV88E6341_PTP_CFG_MODE_TS_AT_PHY	0x00
+#define MV88E6341_PTP_CFG_MODE_TS_AT_MAC	0x80
+
+/* Offset 0x08: PTP Interrupt Status */
+#define MV88E6XXX_PTP_IRQ_STATUS	0x08
+
+/* Per-Port PTP Registers */
+/* Offset 0x00: PTP Configuration 0 */
+#define MV88E6XXX_PORT_PTP_CFG0				0x00
+#define MV88E6XXX_PORT_PTP_CFG0_TSPEC_SHIFT		12
+#define MV88E6XXX_PORT_PTP_CFG0_TSPEC_MASK		0xf000
+#define MV88E6XXX_PORT_PTP_CFG0_TSPEC_1588		0x0000
+#define MV88E6XXX_PORT_PTP_CFG0_TSPEC_8021AS		0x1000
+#define MV88E6XXX_PORT_PTP_CFG0_DISABLE_TSPEC_MATCH	0x0800
+#define MV88E6XXX_PORT_PTP_CFG0_DISABLE_OVERWRITE	0x0002
+#define MV88E6XXX_PORT_PTP_CFG0_DISABLE_PTP		0x0001
+
+/* Offset 0x01: PTP Configuration 1 */
+#define MV88E6XXX_PORT_PTP_CFG1	0x01
+
+/* Offset 0x02: PTP Configuration 2 */
+#define MV88E6XXX_PORT_PTP_CFG2				0x02
+#define MV88E6XXX_PORT_PTP_CFG2_EMBED_ARRIVAL		0x1000
+#define MV88E6XXX_PORT_PTP_CFG2_DEP_IRQ_EN		0x0002
+#define MV88E6XXX_PORT_PTP_CFG2_ARR_IRQ_EN		0x0001
+
+/* Offset 0x03: PTP LED Configuration */
+#define MV88E6XXX_PORT_PTP_LED_CFG	0x03
+
+/* Offset 0x08: PTP Arrival 0 Status */
+#define MV88E6XXX_PORT_PTP_ARR0_STS	0x08
+
+/* Offset 0x09/0x0A: PTP Arrival 0 Time */
+#define MV88E6XXX_PORT_PTP_ARR0_TIME_LO	0x09
+#define MV88E6XXX_PORT_PTP_ARR0_TIME_HI	0x0a
+
+/* Offset 0x0B: PTP Arrival 0 Sequence ID */
+#define MV88E6XXX_PORT_PTP_ARR0_SEQID	0x0b
+
+/* Offset 0x0C: PTP Arrival 1 Status */
+#define MV88E6XXX_PORT_PTP_ARR1_STS	0x0c
+
+/* Offset 0x0D/0x0E: PTP Arrival 1 Time */
+#define MV88E6XXX_PORT_PTP_ARR1_TIME_LO	0x0d
+#define MV88E6XXX_PORT_PTP_ARR1_TIME_HI	0x0e
+
+/* Offset 0x0F: PTP Arrival 1 Sequence ID */
+#define MV88E6XXX_PORT_PTP_ARR1_SEQID	0x0f
+
+/* Offset 0x10: PTP Departure Status */
+#define MV88E6XXX_PORT_PTP_DEP_STS	0x10
+
+/* Offset 0x11/0x12: PTP Deperture Time */
+#define MV88E6XXX_PORT_PTP_DEP_TIME_LO	0x11
+#define MV88E6XXX_PORT_PTP_DEP_TIME_HI	0x12
+
+/* Offset 0x13: PTP Departure Sequence ID */
+#define MV88E6XXX_PORT_PTP_DEP_SEQID	0x13
+
+/* Status fields for arrival and depature timestamp status registers */
+#define MV88E6XXX_PTP_TS_STATUS_MASK		0x0006
+#define MV88E6XXX_PTP_TS_STATUS_NORMAL		0x0000
+#define MV88E6XXX_PTP_TS_STATUS_OVERWITTEN	0x0002
+#define MV88E6XXX_PTP_TS_STATUS_DISCARDED	0x0004
+#define MV88E6XXX_PTP_TS_VALID			0x0001
+
+#ifdef CONFIG_NET_DSA_MV88E6XXX_PTP
+
+int mv88e6xxx_port_hwtstamp_set(struct dsa_switch *ds, int port,
+				struct ifreq *ifr);
+int mv88e6xxx_port_hwtstamp_get(struct dsa_switch *ds, int port,
+				struct ifreq *ifr);
+
+bool mv88e6xxx_port_rxtstamp(struct dsa_switch *ds, int port,
+			     struct sk_buff *clone, unsigned int type);
+bool mv88e6xxx_port_txtstamp(struct dsa_switch *ds, int port,
+			     struct sk_buff *clone, unsigned int type);
+
+int mv88e6xxx_get_ts_info(struct dsa_switch *ds, int port,
+			  struct ethtool_ts_info *info);
+
+int mv88e6xxx_hwtstamp_setup(struct mv88e6xxx_chip *chip);
+void mv88e6xxx_hwtstamp_free(struct mv88e6xxx_chip *chip);
+
+#else /* !CONFIG_NET_DSA_MV88E6XXX_PTP */
+
+static inline int mv88e6xxx_port_hwtstamp_set(struct dsa_switch *ds,
+					      int port, struct ifreq *ifr)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_port_hwtstamp_get(struct dsa_switch *ds,
+					      int port, struct ifreq *ifr)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline bool mv88e6xxx_port_rxtstamp(struct dsa_switch *ds, int port,
+					   struct sk_buff *clone,
+					   unsigned int type)
+{
+	return false;
+}
+
+static inline bool mv88e6xxx_port_txtstamp(struct dsa_switch *ds, int port,
+					   struct sk_buff *clone,
+					   unsigned int type)
+{
+	return false;
+}
+
+static inline int mv88e6xxx_get_ts_info(struct dsa_switch *ds, int port,
+					struct ethtool_ts_info *info)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_hwtstamp_setup(struct mv88e6xxx_chip *chip)
+{
+	return 0;
+}
+
+static inline void mv88e6xxx_hwtstamp_free(struct mv88e6xxx_chip *chip)
+{
+}
+
+#endif /* CONFIG_NET_DSA_MV88E6XXX_PTP */
+
+#endif /* _MV88E6XXX_HWTSTAMP_H */

drivers/net/dsa/mv88e6xxx/ptp.h

+/*
+ * Marvell 88E6xxx Switch PTP support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2017 National Instruments
+ *      Erik Hons <erik.hons@ni.com>
+ *      Brandon Streiff <brandon.streiff@ni.com>
+ *      Dane Wagner <dane.wagner@ni.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _MV88E6XXX_PTP_H
+#define _MV88E6XXX_PTP_H
+
+#include "chip.h"
+
+/* Offset 0x00: TAI Global Config */
+#define MV88E6XXX_TAI_CFG			0x00
+#define MV88E6XXX_TAI_CFG_CAP_OVERWRITE		0x8000
+#define MV88E6XXX_TAI_CFG_CAP_CTR_START		0x4000
+#define MV88E6XXX_TAI_CFG_EVREQ_FALLING		0x2000
+#define MV88E6XXX_TAI_CFG_TRIG_ACTIVE_LO	0x1000
+#define MV88E6XXX_TAI_CFG_IRL_ENABLE		0x0400
+#define MV88E6XXX_TAI_CFG_TRIG_IRQ_EN		0x0200
+#define MV88E6XXX_TAI_CFG_EVREQ_IRQ_EN		0x0100
+#define MV88E6XXX_TAI_CFG_TRIG_LOCK		0x0080
+#define MV88E6XXX_TAI_CFG_BLOCK_UPDATE		0x0008
+#define MV88E6XXX_TAI_CFG_MULTI_PTP		0x0004
+#define MV88E6XXX_TAI_CFG_TRIG_MODE_ONESHOT	0x0002
+#define MV88E6XXX_TAI_CFG_TRIG_ENABLE		0x0001
+
+/* Offset 0x01: Timestamp Clock Period (ps) */
+#define MV88E6XXX_TAI_CLOCK_PERIOD		0x01
+
+/* Offset 0x02/0x03: Trigger Generation Amount */
+#define MV88E6XXX_TAI_TRIG_GEN_AMOUNT_LO	0x02
+#define MV88E6XXX_TAI_TRIG_GEN_AMOUNT_HI	0x03
+
+/* Offset 0x04: Clock Compensation */
+#define MV88E6XXX_TAI_TRIG_CLOCK_COMP		0x04
+
+/* Offset 0x05: Trigger Configuration */
+#define MV88E6XXX_TAI_TRIG_CFG			0x05
+
+/* Offset 0x06: Ingress Rate Limiter Clock Generation Amount */
+#define MV88E6XXX_TAI_IRL_AMOUNT		0x06
+
+/* Offset 0x07: Ingress Rate Limiter Compensation */
+#define MV88E6XXX_TAI_IRL_COMP			0x07
+
+/* Offset 0x08: Ingress Rate Limiter Compensation */
+#define MV88E6XXX_TAI_IRL_COMP_PS		0x08
+
+/* Offset 0x09: Event Status */
+#define MV88E6XXX_TAI_EVENT_STATUS		0x09
+#define MV88E6XXX_TAI_EVENT_STATUS_CAP_TRIG	0x4000
+#define MV88E6XXX_TAI_EVENT_STATUS_ERROR	0x0200
+#define MV88E6XXX_TAI_EVENT_STATUS_VALID	0x0100
+#define MV88E6XXX_TAI_EVENT_STATUS_CTR_MASK	0x00ff
+
+/* Offset 0x0A/0x0B: Event Time */
+#define MV88E6XXX_TAI_EVENT_TIME_LO		0x0a
+#define MV88E6XXX_TAI_EVENT_TYPE_HI		0x0b
+
+/* Offset 0x0E/0x0F: PTP Global Time */
+#define MV88E6XXX_TAI_TIME_LO			0x0e
+#define MV88E6XXX_TAI_TIME_HI			0x0f
+
+/* Offset 0x10/0x11: Trig Generation Time */
+#define MV88E6XXX_TAI_TRIG_TIME_LO		0x10
+#define MV88E6XXX_TAI_TRIG_TIME_HI		0x11
+
+/* Offset 0x12: Lock Status */
+#define MV88E6XXX_TAI_LOCK_STATUS		0x12
+
+#ifdef CONFIG_NET_DSA_MV88E6XXX_PTP
+
+long mv88e6xxx_hwtstamp_work(struct ptp_clock_info *ptp);
+int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip);
+void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip);
+
+#define ptp_to_chip(ptp) container_of(ptp, struct mv88e6xxx_chip,	\
+				      ptp_clock_info)
+
+#else /* !CONFIG_NET_DSA_MV88E6XXX_PTP */
+
+static long mv88e6xxx_hwtstamp_work(struct ptp_clock_info *ptp)
+{
+	return -1;
+}
+
+static inline int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
+{
+	return 0;
+}
+
+static void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip)
+{
+}
+
+#endif /* CONFIG_NET_DSA_MV88E6XXX_PTP */
+
+#endif /* _MV88E6XXX_PTP_H */

include/linux/ptp_classify.h

@@ -75,5 +75,9 @@ void __init ptp_classifier_init(void);
 static inline void ptp_classifier_init(void)
 {
 }
+static inline unsigned int ptp_classify_raw(struct sk_buff *skb)
+{
+	return PTP_CLASS_NONE;
+}
 #endif
 #endif /* _PTP_CLASSIFY_H_ */

include/net/dsa.h

@@ -19,6 +19,7 @@
 #include <linux/workqueue.h>
 #include <linux/of.h>
 #include <linux/ethtool.h>
+#include <linux/net_tstamp.h>
 #include <net/devlink.h>
 #include <net/switchdev.h>
 
@@ -101,6 +102,7 @@ struct dsa_platform_data {
 };
 
 struct packet_type;
+struct dsa_switch;
 
 struct dsa_device_ops {
 	struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
@@ -367,6 +369,12 @@ struct dsa_switch_ops {
 	int	(*set_wol)(struct dsa_switch *ds, int port,
 			   struct ethtool_wolinfo *w);
 
+	/*
+	 * ethtool timestamp info
+	 */
+	int	(*get_ts_info)(struct dsa_switch *ds, int port,
+			       struct ethtool_ts_info *ts);
+
 	/*
 	 * Suspend and resume
 	 */
@@ -469,6 +477,18 @@ struct dsa_switch_ops {
 					 int port, struct net_device *br);
 	void	(*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
 					  int port, struct net_device *br);
+
+	/*
+	 * PTP functionality
+	 */
+	int	(*port_hwtstamp_get)(struct dsa_switch *ds, int port,
+				     struct ifreq *ifr);
+	int	(*port_hwtstamp_set)(struct dsa_switch *ds, int port,
+				     struct ifreq *ifr);
+	bool	(*port_txtstamp)(struct dsa_switch *ds, int port,
+				 struct sk_buff *clone, unsigned int type);
+	bool	(*port_rxtstamp)(struct dsa_switch *ds, int port,
+				 struct sk_buff *skb, unsigned int type);
 };
 
 struct dsa_switch_driver {

net/dsa/dsa.c

@@ -23,6 +23,7 @@
 #include <linux/netdevice.h>
 #include <linux/sysfs.h>
 #include <linux/phy_fixed.h>
+#include <linux/ptp_classify.h>
 #include <linux/gpio/consumer.h>
 #include <linux/etherdevice.h>
 
@@ -122,6 +123,38 @@ struct net_device *dsa_dev_to_net_device(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
 
+/* Determine if we should defer delivery of skb until we have a rx timestamp.
+ *
+ * Called from dsa_switch_rcv. For now, this will only work if tagging is
+ * enabled on the switch. Normally the MAC driver would retrieve the hardware
+ * timestamp when it reads the packet out of the hardware. However in a DSA
+ * switch, the DSA driver owning the interface to which the packet is
+ * delivered is never notified unless we do so here.
+ */
+static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
+				       struct sk_buff *skb)
+{
+	struct dsa_switch *ds = p->dp->ds;
+	unsigned int type;
+
+	if (skb_headroom(skb) < ETH_HLEN)
+		return false;
+
+	__skb_push(skb, ETH_HLEN);
+
+	type = ptp_classify_raw(skb);
+
+	__skb_pull(skb, ETH_HLEN);
+
+	if (type == PTP_CLASS_NONE)
+		return false;
+
+	if (likely(ds->ops->port_rxtstamp))
+		return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
+
+	return false;
+}
+
 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 			  struct packet_type *pt, struct net_device *unused)
 {
@@ -157,6 +190,9 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 	s->rx_bytes += skb->len;
 	u64_stats_update_end(&s->syncp);
 
+	if (dsa_skb_defer_rx_timestamp(p, skb))
+		return 0;
+
 	netif_receive_skb(skb);
 
 	return 0;

net/dsa/slave.c

@@ -21,6 +21,7 @@
 #include <net/tc_act/tc_mirred.h>
 #include <linux/if_bridge.h>
 #include <linux/netpoll.h>
+#include <linux/ptp_classify.h>
 
 #include "dsa_priv.h"
 
@@ -255,6 +256,22 @@ dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 
 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->dp->ds;
+	int port = p->dp->index;
+
+	/* Pass through to switch driver if it supports timestamping */
+	switch (cmd) {
+	case SIOCGHWTSTAMP:
+		if (ds->ops->port_hwtstamp_get)
+			return ds->ops->port_hwtstamp_get(ds, port, ifr);
+		break;
+	case SIOCSHWTSTAMP:
+		if (ds->ops->port_hwtstamp_set)
+			return ds->ops->port_hwtstamp_set(ds, port, ifr);
+		break;
+	}
+
 	if (!dev->phydev)
 		return -ENODEV;
 
@@ -385,6 +402,30 @@ static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 	return NETDEV_TX_OK;
 }
 
+static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
+				 struct sk_buff *skb)
+{
+	struct dsa_switch *ds = p->dp->ds;
+	struct sk_buff *clone;
+	unsigned int type;
+
+	type = ptp_classify_raw(skb);
+	if (type == PTP_CLASS_NONE)
+		return;
+
+	if (!ds->ops->port_txtstamp)
+		return;
+
+	clone = skb_clone_sk(skb);
+	if (!clone)
+		return;
+
+	if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
+		return;
+
+	kfree_skb(clone);
+}
+
 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
@@ -397,6 +438,11 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 	s->tx_bytes += skb->len;
 	u64_stats_update_end(&s->syncp);
 
+	/* Identify PTP protocol packets, clone them, and pass them to the
+	 * switch driver
+	 */
+	dsa_skb_tx_timestamp(p, skb);
+
 	/* Transmit function may have to reallocate the original SKB,
 	 * in which case it must have freed it. Only free it here on error.
 	 */
@@ -918,6 +964,18 @@ static int dsa_slave_set_rxnfc(struct net_device *dev,
 	return ds->ops->set_rxnfc(ds, dp->index, nfc);
 }
 
+static int dsa_slave_get_ts_info(struct net_device *dev,
+				 struct ethtool_ts_info *ts)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->dp->ds;
+
+	if (!ds->ops->get_ts_info)
+		return -EOPNOTSUPP;
+
+	return ds->ops->get_ts_info(ds, p->dp->index, ts);
+}
+
 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 	.get_drvinfo		= dsa_slave_get_drvinfo,
 	.get_regs_len		= dsa_slave_get_regs_len,
@@ -938,6 +996,7 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
 	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 	.get_rxnfc		= dsa_slave_get_rxnfc,
 	.set_rxnfc		= dsa_slave_set_rxnfc,
+	.get_ts_info		= dsa_slave_get_ts_info,
 };
 
 /* legacy way, bypassing the bridge *****************************************/