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Subject[PATCH net-next RFC 8/9] net: dsa: mv88e6xxx: add rx/tx timestamping support
Date
This patch implements RX/TX timestamping support.

The Marvell PTP hardware supports RX timestamping individual message
types, but for simplicity we only support the EVENT receive filter since
few if any clients bother with the more specific filter types.

We also utilize a feature of the "generation 3" PTP hardware that lets
us to embed the timestamp value into one of the reserved fields in the
PTP header. This lets us extract the timestamp out of the header and
avoid an SMI access in the RX codepath. (This implementation does not
presently support the older generations.)

Signed-off-by: Brandon Streiff <brandon.streiff@ni.com>
---
drivers/net/dsa/mv88e6xxx/Makefile | 1 +
drivers/net/dsa/mv88e6xxx/chip.c | 16 +-
drivers/net/dsa/mv88e6xxx/chip.h | 26 ++
drivers/net/dsa/mv88e6xxx/hwtstamp.c | 535 +++++++++++++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx/hwtstamp.h | 162 +++++++++++
5 files changed, 738 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/dsa/mv88e6xxx/hwtstamp.c
create mode 100644 drivers/net/dsa/mv88e6xxx/hwtstamp.h

diff --git a/drivers/net/dsa/mv88e6xxx/Makefile b/drivers/net/dsa/mv88e6xxx/Makefile
index 47eda30..9bd0175 100644
--- a/drivers/net/dsa/mv88e6xxx/Makefile
+++ b/drivers/net/dsa/mv88e6xxx/Makefile
@@ -4,6 +4,7 @@ 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_PTP) += hwtstamp.o
mv88e6xxx-objs += phy.o
mv88e6xxx-objs += port.o
mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 4a37b26..9a0ee56 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -36,6 +36,7 @@
#include "chip.h"
#include "global1.h"
#include "global2.h"
+#include "hwtstamp.h"
#include "phy.h"
#include "port.h"
#include "ptp.h"
@@ -2034,11 +2035,15 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
if (err)
goto unlock;

- /* Setup PTP Hardware Clock */
+ /* Setup PTP Hardware Clock and timestamping */
if (chip->info->ptp_support) {
err = mv88e6xxx_ptp_setup(chip);
if (err)
goto unlock;
+
+ err = mv88e6xxx_hwtstamp_setup(chip);
+ if (err)
+ goto unlock;
}

unlock:
@@ -3851,6 +3856,11 @@ static const struct dsa_switch_ops mv88e6xxx_switch_ops = {
.port_mdb_del = mv88e6xxx_port_mdb_del,
.crosschip_bridge_join = mv88e6xxx_crosschip_bridge_join,
.crosschip_bridge_leave = mv88e6xxx_crosschip_bridge_leave,
+ .port_hwtstamp_set = mv88e6xxx_port_hwtstamp_set,
+ .port_hwtstamp_get = mv88e6xxx_port_hwtstamp_get,
+ .port_txtstamp = mv88e6xxx_port_txtstamp,
+ .port_rxtstamp = mv88e6xxx_port_rxtstamp,
+ .get_ts_info = mv88e6xxx_get_ts_info,
};

static struct dsa_switch_driver mv88e6xxx_switch_drv = {
@@ -3979,8 +3989,10 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
struct mv88e6xxx_chip *chip = ds->priv;

- if (chip->info->ptp_support)
+ if (chip->info->ptp_support) {
+ mv88e6xxx_hwtstamp_free(chip);
mv88e6xxx_ptp_free(chip);
+ }

mv88e6xxx_phy_destroy(chip);
mv88e6xxx_unregister_switch(chip);
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index b763778..52e449b 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -163,6 +163,29 @@ 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 transmit timestamping */
+ struct work_struct tx_tstamp_work;
+ 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;

@@ -231,6 +254,9 @@ struct mv88e6xxx_chip {
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 {
diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.c b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
new file mode 100644
index 0000000..825d6f0
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
@@ -0,0 +1,535 @@
+/*
+ * 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.
+ */
+
+#include "chip.h"
+#include "global2.h"
+#include "hwtstamp.h"
+#include <linux/ptp_classify.h>
+
+static int mv88e6xxx_port_ptp_read(struct mv88e6xxx_chip *chip, int port,
+ int addr, u16 *data, int len)
+{
+ if (!chip->info->ops->avb_ops->port_ptp_read)
+ return -EOPNOTSUPP;
+
+ return chip->info->ops->avb_ops->port_ptp_read(chip, port, addr,
+ data, len);
+}
+
+static int mv88e6xxx_port_ptp_write(struct mv88e6xxx_chip *chip, int port,
+ int addr, u16 data)
+{
+ if (!chip->info->ops->avb_ops->port_ptp_write)
+ return -EOPNOTSUPP;
+
+ return chip->info->ops->avb_ops->port_ptp_write(chip, port, addr,
+ data);
+}
+
+static int mv88e6xxx_ptp_write(struct mv88e6xxx_chip *chip, int addr,
+ u16 data)
+{
+ if (!chip->info->ops->avb_ops->ptp_write)
+ return -EOPNOTSUPP;
+
+ return chip->info->ops->avb_ops->ptp_write(chip, addr, data);
+}
+
+/* TX_TSTAMP_TIMEOUT: This limits the time spent polling for a TX
+ * timestamp. When working properly, hardware will produce a timestamp
+ * within 1ms. Software may enounter delays due to MDIO contention, so
+ * the timeout is set accordingly.
+ */
+#define TX_TSTAMP_TIMEOUT msecs_to_jiffies(20)
+
+int mv88e6xxx_get_ts_info(struct dsa_switch *ds, int port,
+ struct ethtool_ts_info *info)
+{
+ struct mv88e6xxx_chip *chip = ds->priv;
+
+ if (!chip->info->ptp_support)
+ return -EOPNOTSUPP;
+
+ info->so_timestamping =
+ SOF_TIMESTAMPING_TX_HARDWARE |
+ SOF_TIMESTAMPING_RX_HARDWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE;
+ info->phc_index = ptp_clock_index(chip->ptp_clock);
+ info->tx_types =
+ (1 << HWTSTAMP_TX_OFF) |
+ (1 << HWTSTAMP_TX_ON);
+ info->rx_filters =
+ (1 << HWTSTAMP_FILTER_NONE) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L2_SYNC) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ);
+
+ return 0;
+}
+
+static int mv88e6xxx_set_hwtstamp_config(struct mv88e6xxx_chip *chip, int port,
+ struct hwtstamp_config *config)
+{
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+ bool tstamp_enable = false;
+ u16 port_config0;
+ int err;
+
+ /* Prevent the TX/RX paths from trying to interact with the
+ * timestamp hardware while we reconfigure it.
+ */
+ clear_bit_unlock(MV88E6XXX_HWTSTAMP_ENABLED, &ps->state);
+
+ /* reserved for future extensions */
+ if (config->flags)
+ return -EINVAL;
+
+ switch (config->tx_type) {
+ case HWTSTAMP_TX_OFF:
+ tstamp_enable = false;
+ break;
+ case HWTSTAMP_TX_ON:
+ tstamp_enable = true;
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ /* The switch supports timestamping both L2 and L4; one cannot be
+ * disabled independently of the other.
+ */
+ switch (config->rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ tstamp_enable = false;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+ break;
+ case HWTSTAMP_FILTER_ALL:
+ default:
+ config->rx_filter = HWTSTAMP_FILTER_NONE;
+ return -ERANGE;
+ }
+
+ if (tstamp_enable) {
+ /* Disable transportSpecific value matching, so that packets
+ * with either 1588 (0) and 802.1AS (1) will be timestamped.
+ */
+ port_config0 = MV88E6XXX_PORT_PTP_CFG0_DISABLE_TSPEC_MATCH;
+ } else {
+ /* Disable PTP. This disables both RX and TX timestamping. */
+ port_config0 = MV88E6XXX_PORT_PTP_CFG0_DISABLE_PTP;
+ }
+
+ mutex_lock(&chip->reg_lock);
+ err = mv88e6xxx_port_ptp_write(chip, port, MV88E6XXX_PORT_PTP_CFG0,
+ port_config0);
+ mutex_unlock(&chip->reg_lock);
+
+ if (err < 0)
+ return err;
+
+ /* Once hardware has been configured, enable timestamp checks
+ * in the RX/TX paths.
+ */
+ if (tstamp_enable)
+ set_bit(MV88E6XXX_HWTSTAMP_ENABLED, &ps->state);
+
+ return 0;
+}
+
+int mv88e6xxx_port_hwtstamp_set(struct dsa_switch *ds, int port,
+ struct ifreq *ifr)
+{
+ struct mv88e6xxx_chip *chip = ds->priv;
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+ struct hwtstamp_config config;
+ int err;
+
+ if (!chip->info->ptp_support)
+ return -EOPNOTSUPP;
+
+ if (port < 0 || port >= mv88e6xxx_num_ports(chip))
+ return -EINVAL;
+
+ if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ err = mv88e6xxx_set_hwtstamp_config(chip, port, &config);
+ if (err)
+ return err;
+
+ /* Save the chosen configuration to be returned later. */
+ memcpy(&ps->tstamp_config, &config, sizeof(config));
+
+ return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+int mv88e6xxx_port_hwtstamp_get(struct dsa_switch *ds, int port,
+ struct ifreq *ifr)
+{
+ struct mv88e6xxx_chip *chip = ds->priv;
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+ struct hwtstamp_config *config = &ps->tstamp_config;
+
+ if (!chip->info->ptp_support)
+ return -EOPNOTSUPP;
+
+ if (port < 0 || port >= mv88e6xxx_num_ports(chip))
+ return -EINVAL;
+
+ return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
+ -EFAULT : 0;
+}
+
+/* Get the start of the PTP header in this skb */
+static u8 *_get_ptp_header(struct sk_buff *skb, unsigned int type)
+{
+ unsigned int offset = 0;
+ u8 *data = skb_mac_header(skb);
+
+ if (type & PTP_CLASS_VLAN)
+ offset += VLAN_HLEN;
+
+ switch (type & PTP_CLASS_PMASK) {
+ case PTP_CLASS_IPV4:
+ offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
+ break;
+ case PTP_CLASS_IPV6:
+ offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
+ break;
+ case PTP_CLASS_L2:
+ offset += ETH_HLEN;
+ break;
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* Ensure that the entire header is present in this packet. */
+ if (skb->len + ETH_HLEN < offset + 34)
+ return ERR_PTR(-EINVAL);
+
+ return data + offset;
+}
+
+static bool mv88e6xxx_should_tstamp(struct mv88e6xxx_chip *chip, int port,
+ struct sk_buff *skb, unsigned int type)
+{
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+ u8 *ptp_hdr, *msgtype;
+ bool ret;
+
+ if (port < 0 || port >= mv88e6xxx_num_ports(chip))
+ return false;
+
+ ptp_hdr = _get_ptp_header(skb, type);
+ if (IS_ERR(ptp_hdr))
+ return false;
+
+ if (unlikely(type & PTP_CLASS_V1))
+ msgtype = ptp_hdr + OFF_PTP_CONTROL;
+ else
+ msgtype = ptp_hdr;
+
+ ret = test_bit(MV88E6XXX_HWTSTAMP_ENABLED, &ps->state);
+
+ dev_dbg(chip->dev,
+ "p%d: PTP message classification 0x%x type 0x%x, tstamp? %d",
+ port, type, *msgtype, (int)ret);
+
+ return ret;
+}
+
+/* rxtstamp will be called in interrupt context so we don't to do
+ * anything like read PTP registers over SMI.
+ */
+bool mv88e6xxx_port_rxtstamp(struct dsa_switch *ds, int port,
+ struct sk_buff *skb, unsigned int type)
+{
+ struct mv88e6xxx_chip *chip = ds->priv;
+ struct skb_shared_hwtstamps *shhwtstamps;
+ __be32 *ptp_rx_ts;
+ u8 *ptp_hdr;
+ u32 raw_ts;
+ u64 ns;
+
+ if (!chip->info->ptp_support)
+ return false;
+
+ if (port < 0 || port >= mv88e6xxx_num_ports(chip))
+ return false;
+
+ if (!mv88e6xxx_should_tstamp(chip, port, skb, type))
+ return false;
+
+ shhwtstamps = skb_hwtstamps(skb);
+ memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+
+ /* Because we configured the arrival timestamper to put the counter
+ * into the 32-bit "reserved" field of the PTP header, we can retrieve
+ * the value from the packet directly instead of having to retrieve it
+ * via SMI.
+ */
+ ptp_hdr = _get_ptp_header(skb, type);
+ if (IS_ERR(ptp_hdr))
+ return false;
+ ptp_rx_ts = (__be32 *)(ptp_hdr + OFF_PTP_RESERVED);
+ raw_ts = __be32_to_cpu(*ptp_rx_ts);
+ ns = timecounter_cyc2time(&chip->tstamp_tc, raw_ts);
+ shhwtstamps->hwtstamp = ns_to_ktime(ns);
+
+ dev_dbg(chip->dev, "p%d: rxtstamp %llx\n", port, ns);
+
+ return false;
+}
+
+static void mv88e6xxx_txtstamp_work(struct work_struct *ugly)
+{
+ struct mv88e6xxx_port_hwtstamp *ps = container_of(
+ ugly, struct mv88e6xxx_port_hwtstamp, tx_tstamp_work);
+ struct mv88e6xxx_chip *chip = container_of(
+ ps, struct mv88e6xxx_chip, port_hwtstamp[ps->port_id]);
+ struct sk_buff *tmp_skb;
+ unsigned long tmp_tstamp_start;
+ int err;
+ u16 departure_block[4];
+ u16 tmp_seq_id;
+
+ if (!test_bit(MV88E6XXX_HWTSTAMP_TX_IN_PROGRESS, &ps->state))
+ return;
+
+ tmp_skb = ps->tx_skb;
+ tmp_seq_id = ps->tx_seq_id;
+ tmp_tstamp_start = ps->tx_tstamp_start;
+
+ if (!tmp_skb)
+ return;
+
+ mutex_lock(&chip->reg_lock);
+ err = mv88e6xxx_port_ptp_read(chip, ps->port_id,
+ MV88E6XXX_PORT_PTP_DEP_STS,
+ departure_block,
+ ARRAY_SIZE(departure_block));
+ mutex_unlock(&chip->reg_lock);
+
+ if (err)
+ goto free_and_clear_skb;
+
+ if (departure_block[0] & MV88E6XXX_PTP_TS_VALID) {
+ struct skb_shared_hwtstamps shhwtstamps;
+ u64 ns;
+ u32 time_raw;
+ u16 status;
+
+ /* We have the timestamp; go ahead and clear valid now */
+ mutex_lock(&chip->reg_lock);
+ mv88e6xxx_port_ptp_write(chip, ps->port_id,
+ MV88E6XXX_PORT_PTP_DEP_STS, 0);
+ mutex_unlock(&chip->reg_lock);
+
+ status = departure_block[0] &
+ MV88E6XXX_PTP_TS_STATUS_MASK;
+ if (status != MV88E6XXX_PTP_TS_STATUS_NORMAL) {
+ dev_warn(chip->dev, "p%d: tx timestamp overrun\n",
+ ps->port_id);
+ goto free_and_clear_skb;
+ }
+
+ if (departure_block[3] != tmp_seq_id) {
+ dev_warn(chip->dev, "p%d: unexpected sequence id\n",
+ ps->port_id);
+ goto free_and_clear_skb;
+ }
+
+ memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+ time_raw = ((u32)departure_block[2] << 16) |
+ departure_block[1];
+ ns = timecounter_cyc2time(&chip->tstamp_tc, time_raw);
+ shhwtstamps.hwtstamp = ns_to_ktime(ns);
+
+ dev_dbg(chip->dev,
+ "p%d: txtstamp %llx status 0x%04x skb ID 0x%04x hw ID 0x%04x\n",
+ ps->port_id, ktime_to_ns(shhwtstamps.hwtstamp),
+ departure_block[0], tmp_seq_id, departure_block[3]);
+
+ /* skb_complete_tx_timestamp() will free up the client to make
+ * another timestamp-able transmit. We have to be ready for it
+ * -- by clearing the ps->tx_skb "flag" -- beforehand.
+ */
+
+ ps->tx_skb = NULL;
+ clear_bit_unlock(MV88E6XXX_HWTSTAMP_TX_IN_PROGRESS, &ps->state);
+
+ skb_complete_tx_timestamp(tmp_skb, &shhwtstamps);
+
+ } else {
+ if (time_is_before_jiffies(
+ tmp_tstamp_start + TX_TSTAMP_TIMEOUT)) {
+ dev_warn(chip->dev, "p%d: clearing tx timestamp hang\n",
+ ps->port_id);
+ goto free_and_clear_skb;
+ }
+
+ /* The timestamp should be available quickly, while getting it
+ * is high priority and time bounded to only 10ms. A poll is
+ * warranted and this is the nicest way to realize it in a work
+ * item.
+ */
+
+ queue_work(system_highpri_wq, &ps->tx_tstamp_work);
+ }
+
+ return;
+
+free_and_clear_skb:
+ ps->tx_skb = NULL;
+ clear_bit_unlock(MV88E6XXX_HWTSTAMP_TX_IN_PROGRESS, &ps->state);
+
+ dev_kfree_skb_any(tmp_skb);
+}
+
+void mv88e6xxx_port_txtstamp(struct dsa_switch *ds, int port,
+ struct sk_buff *clone, unsigned int type)
+{
+ struct mv88e6xxx_chip *chip = ds->priv;
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+
+ if (!chip->info->ptp_support)
+ return;
+
+ if (port < 0 || port >= mv88e6xxx_num_ports(chip))
+ goto out;
+
+ if (unlikely(skb_shinfo(clone)->tx_flags & SKBTX_HW_TSTAMP) &&
+ mv88e6xxx_should_tstamp(chip, port, clone, type)) {
+ __be16 *seq_ptr = (__be16 *)(_get_ptp_header(clone, type) +
+ OFF_PTP_SEQUENCE_ID);
+
+ if (!test_and_set_bit_lock(MV88E6XXX_HWTSTAMP_TX_IN_PROGRESS,
+ &ps->state)) {
+ ps->tx_skb = clone;
+ ps->tx_tstamp_start = jiffies;
+ ps->tx_seq_id = be16_to_cpup(seq_ptr);
+
+ /* Fetching the timestamp is high-priority work because
+ * 802.1AS bounds the time for a response.
+ *
+ * No need to check result of queue_work(). ps->tx_skb
+ * check ensures work item is not pending (it may be
+ * waiting to exit)
+ */
+ queue_work(system_highpri_wq, &ps->tx_tstamp_work);
+ return;
+ }
+
+ /* Otherwise we're already in progress... */
+ dev_dbg(chip->dev,
+ "p%d: tx timestamp already in progress, discarding",
+ port);
+ }
+
+out:
+ /* We don't need it after all. */
+ kfree_skb(clone);
+}
+
+static int mv88e6xxx_hwtstamp_port_setup(struct mv88e6xxx_chip *chip, int port)
+{
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+
+ ps->port_id = port;
+ INIT_WORK(&ps->tx_tstamp_work, mv88e6xxx_txtstamp_work);
+
+ return mv88e6xxx_port_ptp_write(chip, port, MV88E6XXX_PORT_PTP_CFG0,
+ MV88E6XXX_PORT_PTP_CFG0_DISABLE_PTP);
+}
+
+static void mv88e6xxx_hwtstamp_port_free(struct mv88e6xxx_chip *chip, int port)
+{
+ struct mv88e6xxx_port_hwtstamp *ps = &chip->port_hwtstamp[port];
+
+ cancel_work_sync(&ps->tx_tstamp_work);
+}
+
+int mv88e6xxx_hwtstamp_setup(struct mv88e6xxx_chip *chip)
+{
+ int i;
+ int err;
+
+ /* Disable timestamping on all ports. */
+ for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
+ err = mv88e6xxx_hwtstamp_port_setup(chip, i);
+ if (err)
+ return err;
+ }
+
+ /* MV88E6XXX_PTP_MSG_TYPE is a mask of PTP message types to
+ * timestamp. This affects all ports that have timestamping enabled,
+ * but the timestamp config is per-port; thus we configure all events
+ * here and only support the HWTSTAMP_FILTER_*_EVENT filter types.
+ */
+ err = mv88e6xxx_ptp_write(chip, MV88E6XXX_PTP_MSGTYPE,
+ MV88E6XXX_PTP_MSGTYPE_ALL_EVENT);
+ if (err)
+ return err;
+
+ /* Each event type will be timestamped using ARRIVAL0. */
+ err = mv88e6xxx_ptp_write(chip, MV88E6XXX_PTP_TS_ARRIVAL_PTR, 0x0);
+ if (err)
+ return err;
+
+ /* Configure the switch to embed the (32-bit) arrival timestamps in
+ * the packets, in the "reserved" field of the PTP header at octet 16
+ * (OFF_PTP_RESERVED), and disable interrupts. When we do the per-port
+ * configuration later, we will also allow overwrites (by not setting
+ * the DISABLE_OVERWRITE bit). This combination lets us handle
+ * back-to-back RX packets easily, because we don't have to do an SMI
+ * access to retrieve the timestamp.
+ */
+ for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
+ u16 val = MV88E6XXX_PORT_PTP_CFG2_EMBED_ARRIVAL;
+
+ err = mv88e6xxx_port_ptp_write(chip, i,
+ MV88E6XXX_PORT_PTP_CFG2, val);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+void mv88e6xxx_hwtstamp_free(struct mv88e6xxx_chip *chip)
+{
+ int i;
+
+ for (i = 0; i < mv88e6xxx_num_ports(chip); ++i)
+ mv88e6xxx_hwtstamp_port_free(chip, i);
+}
diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.h b/drivers/net/dsa/mv88e6xxx/hwtstamp.h
new file mode 100644
index 0000000..1d24220
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.h
@@ -0,0 +1,162 @@
+/*
+ * 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 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);
+void 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 void mv88e6xxx_port_txtstamp(struct dsa_switch *ds, int port,
+ struct sk_buff *clone,
+ unsigned int type)
+{
+}
+
+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 -EOPNOTSUPP;
+}
+
+static inline void mv88e6xxx_hwtstamp_free(struct mv88e6xxx_chip *chip)
+{
+}
+
+#endif /* CONFIG_NET_DSA_MV88E6XXX_PTP */
+
+#endif /* _MV88E6XXX_HWTSTAMP_H */
--
2.1.4
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