Merge branch 'Support-programmable-pins-for-Ocelot-PTP-driver'

Yangbo Lu says:

====================
Support programmable pins for Ocelot PTP driver

The Ocelot PTP clock driver had been embedded into ocelot.c driver.
It had supported basic gettime64/settime64/adjtime/adjfine functions
by now which were used by both Ocelot switch and Felix switch.

This patch-set is to move current ptp clock code out of ocelot.c driver
maintaining as a single ocelot_ptp.c driver, and to implement 4
programmable pins with only PTP_PF_PEROUT function for now.
The PTP_PF_EXTTS function will be supported in the future, and it should
be implemented separately for Felix and Ocelot, because of different
hardware interrupt implementation in them.

Changes for v2:
	- Put PTP driver under drivers/net/ethernet/mscc/.
	- Dropped MAINTAINERS patch. Kept original maintaining.
	- Initialized PTP separately in ocelot/felix platforms.
	- Supported PPS case in programmable pin.
	- Supported disabling pin function since deadlock is fixed by Richard.
	- Returned -EBUSY if not finding pin available.
Changes for v3:
	- Re-sent.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -7,6 +7,7 @@
 #include <soc/mscc/ocelot_sys.h>
 #include <soc/mscc/ocelot_dev.h>
 #include <soc/mscc/ocelot_ana.h>
+#include <soc/mscc/ocelot_ptp.h>
 #include <soc/mscc/ocelot.h>
 #include <linux/packing.h>
 #include <linux/module.h>
@@ -494,6 +495,23 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 	return 0;
 }
 
+static struct ptp_clock_info ocelot_ptp_clock_info = {
+	.owner		= THIS_MODULE,
+	.name		= "felix ptp",
+	.max_adj	= 0x7fffffff,
+	.n_alarm	= 0,
+	.n_ext_ts	= 0,
+	.n_per_out	= OCELOT_PTP_PINS_NUM,
+	.n_pins		= OCELOT_PTP_PINS_NUM,
+	.pps		= 0,
+	.gettime64	= ocelot_ptp_gettime64,
+	.settime64	= ocelot_ptp_settime64,
+	.adjtime	= ocelot_ptp_adjtime,
+	.adjfine	= ocelot_ptp_adjfine,
+	.verify		= ocelot_ptp_verify,
+	.enable		= ocelot_ptp_enable,
+};
+
 /* Hardware initialization done here so that we can allocate structures with
  * devm without fear of dsa_register_switch returning -EPROBE_DEFER and causing
  * us to allocate structures twice (leak memory) and map PCI memory twice
@@ -510,6 +528,14 @@ static int felix_setup(struct dsa_switch *ds)
 		return err;
 
 	ocelot_init(ocelot);
+	if (ocelot->ptp) {
+		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
+		if (err) {
+			dev_err(ocelot->dev,
+				"Timestamp initialization failed\n");
+			ocelot->ptp = 0;
+		}
+	}
 
 	for (port = 0; port < ds->num_ports; port++) {
 		ocelot_init_port(ocelot, port);
@@ -548,6 +574,7 @@ static void felix_teardown(struct dsa_switch *ds)
 	if (felix->info->mdio_bus_free)
 		felix->info->mdio_bus_free(ocelot);
 
+	ocelot_deinit_timestamp(ocelot);
 	/* stop workqueue thread */
 	ocelot_deinit(ocelot);
 }

drivers/net/dsa/ocelot/felix_vsc9959.c

@@ -313,6 +313,8 @@ static const u32 vsc9959_ptp_regmap[] = {
 	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
 	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
 	REG(PTP_PIN_TOD_NSEC,              0x00000c),
+	REG(PTP_PIN_WF_HIGH_PERIOD,        0x000014),
+	REG(PTP_PIN_WF_LOW_PERIOD,         0x000018),
 	REG(PTP_CFG_MISC,                  0x0000a0),
 	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
 	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),

drivers/net/ethernet/mscc/Makefile

 # SPDX-License-Identifier: (GPL-2.0 OR MIT)
 obj-$(CONFIG_MSCC_OCELOT_SWITCH) += mscc_ocelot_common.o
 mscc_ocelot_common-y := ocelot.o ocelot_io.o
-mscc_ocelot_common-y += ocelot_regs.o ocelot_tc.o ocelot_police.o ocelot_ace.o ocelot_flower.o
+mscc_ocelot_common-y += ocelot_regs.o ocelot_tc.o ocelot_police.o ocelot_ace.o ocelot_flower.o ocelot_ptp.o
 obj-$(CONFIG_MSCC_OCELOT_SWITCH_OCELOT) += ocelot_board.o

drivers/net/ethernet/mscc/ocelot.c

@@ -14,7 +14,6 @@
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
-#include <linux/ptp_clock_kernel.h>
 #include <linux/skbuff.h>
 #include <linux/iopoll.h>
 #include <net/arp.h>
@@ -1350,6 +1349,12 @@ int ocelot_get_ts_info(struct ocelot *ocelot, int port,
 {
 	info->phc_index = ocelot->ptp_clock ?
 			  ptp_clock_index(ocelot->ptp_clock) : -1;
+	if (info->phc_index == -1) {
+		info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE |
+					 SOF_TIMESTAMPING_RX_SOFTWARE |
+					 SOF_TIMESTAMPING_SOFTWARE;
+		return 0;
+	}
 	info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE |
 				 SOF_TIMESTAMPING_RX_SOFTWARE |
 				 SOF_TIMESTAMPING_SOFTWARE |
@@ -1991,200 +1996,6 @@ struct notifier_block ocelot_switchdev_blocking_nb __read_mostly = {
 };
 EXPORT_SYMBOL(ocelot_switchdev_blocking_nb);
 
-int ocelot_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
-{
-	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
-	unsigned long flags;
-	time64_t s;
-	u32 val;
-	s64 ns;
-
-	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
-
-	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
-	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
-	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_SAVE);
-	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
-
-	s = ocelot_read_rix(ocelot, PTP_PIN_TOD_SEC_MSB, TOD_ACC_PIN) & 0xffff;
-	s <<= 32;
-	s += ocelot_read_rix(ocelot, PTP_PIN_TOD_SEC_LSB, TOD_ACC_PIN);
-	ns = ocelot_read_rix(ocelot, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
-
-	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
-
-	/* Deal with negative values */
-	if (ns >= 0x3ffffff0 && ns <= 0x3fffffff) {
-		s--;
-		ns &= 0xf;
-		ns += 999999984;
-	}
-
-	set_normalized_timespec64(ts, s, ns);
-	return 0;
-}
-EXPORT_SYMBOL(ocelot_ptp_gettime64);
-
-static int ocelot_ptp_settime64(struct ptp_clock_info *ptp,
-				const struct timespec64 *ts)
-{
-	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
-	unsigned long flags;
-	u32 val;
-
-	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
-
-	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
-	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
-	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_IDLE);
-
-	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
-
-	ocelot_write_rix(ocelot, lower_32_bits(ts->tv_sec), PTP_PIN_TOD_SEC_LSB,
-			 TOD_ACC_PIN);
-	ocelot_write_rix(ocelot, upper_32_bits(ts->tv_sec), PTP_PIN_TOD_SEC_MSB,
-			 TOD_ACC_PIN);
-	ocelot_write_rix(ocelot, ts->tv_nsec, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
-
-	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
-	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
-	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_LOAD);
-
-	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
-
-	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
-	return 0;
-}
-
-static int ocelot_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
-{
-	if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
-		struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
-		unsigned long flags;
-		u32 val;
-
-		spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
-
-		val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
-		val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
-		val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_IDLE);
-
-		ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
-
-		ocelot_write_rix(ocelot, 0, PTP_PIN_TOD_SEC_LSB, TOD_ACC_PIN);
-		ocelot_write_rix(ocelot, 0, PTP_PIN_TOD_SEC_MSB, TOD_ACC_PIN);
-		ocelot_write_rix(ocelot, delta, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
-
-		val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
-		val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
-		val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_DELTA);
-
-		ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
-
-		spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
-	} else {
-		/* Fall back using ocelot_ptp_settime64 which is not exact. */
-		struct timespec64 ts;
-		u64 now;
-
-		ocelot_ptp_gettime64(ptp, &ts);
-
-		now = ktime_to_ns(timespec64_to_ktime(ts));
-		ts = ns_to_timespec64(now + delta);
-
-		ocelot_ptp_settime64(ptp, &ts);
-	}
-	return 0;
-}
-
-static int ocelot_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
-{
-	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
-	u32 unit = 0, direction = 0;
-	unsigned long flags;
-	u64 adj = 0;
-
-	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
-
-	if (!scaled_ppm)
-		goto disable_adj;
-
-	if (scaled_ppm < 0) {
-		direction = PTP_CFG_CLK_ADJ_CFG_DIR;
-		scaled_ppm = -scaled_ppm;
-	}
-
-	adj = PSEC_PER_SEC << 16;
-	do_div(adj, scaled_ppm);
-	do_div(adj, 1000);
-
-	/* If the adjustment value is too large, use ns instead */
-	if (adj >= (1L << 30)) {
-		unit = PTP_CFG_CLK_ADJ_FREQ_NS;
-		do_div(adj, 1000);
-	}
-
-	/* Still too big */
-	if (adj >= (1L << 30))
-		goto disable_adj;
-
-	ocelot_write(ocelot, unit | adj, PTP_CLK_CFG_ADJ_FREQ);
-	ocelot_write(ocelot, PTP_CFG_CLK_ADJ_CFG_ENA | direction,
-		     PTP_CLK_CFG_ADJ_CFG);
-
-	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
-	return 0;
-
-disable_adj:
-	ocelot_write(ocelot, 0, PTP_CLK_CFG_ADJ_CFG);
-
-	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
-	return 0;
-}
-
-static struct ptp_clock_info ocelot_ptp_clock_info = {
-	.owner		= THIS_MODULE,
-	.name		= "ocelot ptp",
-	.max_adj	= 0x7fffffff,
-	.n_alarm	= 0,
-	.n_ext_ts	= 0,
-	.n_per_out	= 0,
-	.n_pins		= 0,
-	.pps		= 0,
-	.gettime64	= ocelot_ptp_gettime64,
-	.settime64	= ocelot_ptp_settime64,
-	.adjtime	= ocelot_ptp_adjtime,
-	.adjfine	= ocelot_ptp_adjfine,
-};
-
-static int ocelot_init_timestamp(struct ocelot *ocelot)
-{
-	struct ptp_clock *ptp_clock;
-
-	ocelot->ptp_info = ocelot_ptp_clock_info;
-	ptp_clock = ptp_clock_register(&ocelot->ptp_info, ocelot->dev);
-	if (IS_ERR(ptp_clock))
-		return PTR_ERR(ptp_clock);
-	/* Check if PHC support is missing at the configuration level */
-	if (!ptp_clock)
-		return 0;
-
-	ocelot->ptp_clock = ptp_clock;
-
-	ocelot_write(ocelot, SYS_PTP_CFG_PTP_STAMP_WID(30), SYS_PTP_CFG);
-	ocelot_write(ocelot, 0xffffffff, ANA_TABLES_PTP_ID_LOW);
-	ocelot_write(ocelot, 0xffffffff, ANA_TABLES_PTP_ID_HIGH);
-
-	ocelot_write(ocelot, PTP_CFG_MISC_PTP_EN, PTP_CFG_MISC);
-
-	/* There is no device reconfiguration, PTP Rx stamping is always
-	 * enabled.
-	 */
-	ocelot->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
-
-	return 0;
-}
-
 /* Configure the maximum SDU (L2 payload) on RX to the value specified in @sdu.
  * The length of VLAN tags is accounted for automatically via DEV_MAC_TAGS_CFG.
  * In the special case that it's the NPI port that we're configuring, the
@@ -2530,15 +2341,6 @@ int ocelot_init(struct ocelot *ocelot)
 	queue_delayed_work(ocelot->stats_queue, &ocelot->stats_work,
 			   OCELOT_STATS_CHECK_DELAY);
 
-	if (ocelot->ptp) {
-		ret = ocelot_init_timestamp(ocelot);
-		if (ret) {
-			dev_err(ocelot->dev,
-				"Timestamp initialization failed\n");
-			return ret;
-		}
-	}
-
 	return 0;
 }
 EXPORT_SYMBOL(ocelot_init);
@@ -2551,8 +2353,6 @@ void ocelot_deinit(struct ocelot *ocelot)
 	cancel_delayed_work(&ocelot->stats_work);
 	destroy_workqueue(ocelot->stats_queue);
 	mutex_destroy(&ocelot->stats_lock);
-	if (ocelot->ptp_clock)
-		ptp_clock_unregister(ocelot->ptp_clock);
 
 	for (i = 0; i < ocelot->num_phys_ports; i++) {
 		port = ocelot->ports[i];

drivers/net/ethernet/mscc/ocelot.h

@@ -15,18 +15,17 @@
 #include <linux/phy.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
-#include <linux/ptp_clock_kernel.h>
 #include <linux/regmap.h>
 
 #include <soc/mscc/ocelot_qsys.h>
 #include <soc/mscc/ocelot_sys.h>
 #include <soc/mscc/ocelot_dev.h>
 #include <soc/mscc/ocelot_ana.h>
+#include <soc/mscc/ocelot_ptp.h>
 #include <soc/mscc/ocelot.h>
 #include "ocelot_rew.h"
 #include "ocelot_qs.h"
 #include "ocelot_tc.h"
-#include "ocelot_ptp.h"
 
 #define OCELOT_BUFFER_CELL_SZ 60
 

drivers/net/ethernet/mscc/ocelot_board.c

@@ -366,6 +366,23 @@ static const struct vcap_props vsc7514_vcap_props[] = {
 	},
 };
 
+static struct ptp_clock_info ocelot_ptp_clock_info = {
+	.owner		= THIS_MODULE,
+	.name		= "ocelot ptp",
+	.max_adj	= 0x7fffffff,
+	.n_alarm	= 0,
+	.n_ext_ts	= 0,
+	.n_per_out	= OCELOT_PTP_PINS_NUM,
+	.n_pins		= OCELOT_PTP_PINS_NUM,
+	.pps		= 0,
+	.gettime64	= ocelot_ptp_gettime64,
+	.settime64	= ocelot_ptp_settime64,
+	.adjtime	= ocelot_ptp_adjtime,
+	.adjfine	= ocelot_ptp_adjfine,
+	.verify		= ocelot_ptp_verify,
+	.enable		= ocelot_ptp_enable,
+};
+
 static int mscc_ocelot_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -469,6 +486,15 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 	ocelot->vcap = vsc7514_vcap_props;
 
 	ocelot_init(ocelot);
+	if (ocelot->ptp) {
+		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
+		if (err) {
+			dev_err(ocelot->dev,
+				"Timestamp initialization failed\n");
+			ocelot->ptp = 0;
+		}
+	}
+
 	/* No NPI port */
 	ocelot_configure_cpu(ocelot, -1, OCELOT_TAG_PREFIX_NONE,
 			     OCELOT_TAG_PREFIX_NONE);
@@ -574,6 +600,7 @@ static int mscc_ocelot_remove(struct platform_device *pdev)
 {
 	struct ocelot *ocelot = platform_get_drvdata(pdev);
 
+	ocelot_deinit_timestamp(ocelot);
 	ocelot_deinit(ocelot);
 	unregister_switchdev_blocking_notifier(&ocelot_switchdev_blocking_nb);
 	unregister_switchdev_notifier(&ocelot_switchdev_nb);

drivers/net/ethernet/mscc/ocelot_ptp.c

+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/* Microsemi Ocelot PTP clock driver
+ *
+ * Copyright (c) 2017 Microsemi Corporation
+ * Copyright 2020 NXP
+ */
+#include <soc/mscc/ocelot_ptp.h>
+#include <soc/mscc/ocelot_sys.h>
+#include <soc/mscc/ocelot.h>
+
+int ocelot_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts)
+{
+	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
+	unsigned long flags;
+	time64_t s;
+	u32 val;
+	s64 ns;
+
+	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+
+	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
+	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
+	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_SAVE);
+	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
+
+	s = ocelot_read_rix(ocelot, PTP_PIN_TOD_SEC_MSB, TOD_ACC_PIN) & 0xffff;
+	s <<= 32;
+	s += ocelot_read_rix(ocelot, PTP_PIN_TOD_SEC_LSB, TOD_ACC_PIN);
+	ns = ocelot_read_rix(ocelot, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
+
+	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+
+	/* Deal with negative values */
+	if (ns >= 0x3ffffff0 && ns <= 0x3fffffff) {
+		s--;
+		ns &= 0xf;
+		ns += 999999984;
+	}
+
+	set_normalized_timespec64(ts, s, ns);
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_gettime64);
+
+int ocelot_ptp_settime64(struct ptp_clock_info *ptp,
+			 const struct timespec64 *ts)
+{
+	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+
+	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
+	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
+	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_IDLE);
+
+	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
+
+	ocelot_write_rix(ocelot, lower_32_bits(ts->tv_sec), PTP_PIN_TOD_SEC_LSB,
+			 TOD_ACC_PIN);
+	ocelot_write_rix(ocelot, upper_32_bits(ts->tv_sec), PTP_PIN_TOD_SEC_MSB,
+			 TOD_ACC_PIN);
+	ocelot_write_rix(ocelot, ts->tv_nsec, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
+
+	val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
+	val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK | PTP_PIN_CFG_DOM);
+	val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_LOAD);
+
+	ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
+
+	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_settime64);
+
+int ocelot_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	if (delta > -(NSEC_PER_SEC / 2) && delta < (NSEC_PER_SEC / 2)) {
+		struct ocelot *ocelot = container_of(ptp, struct ocelot,
+						     ptp_info);
+		unsigned long flags;
+		u32 val;
+
+		spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+
+		val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
+		val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK |
+			 PTP_PIN_CFG_DOM);
+		val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_IDLE);
+
+		ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
+
+		ocelot_write_rix(ocelot, 0, PTP_PIN_TOD_SEC_LSB, TOD_ACC_PIN);
+		ocelot_write_rix(ocelot, 0, PTP_PIN_TOD_SEC_MSB, TOD_ACC_PIN);
+		ocelot_write_rix(ocelot, delta, PTP_PIN_TOD_NSEC, TOD_ACC_PIN);
+
+		val = ocelot_read_rix(ocelot, PTP_PIN_CFG, TOD_ACC_PIN);
+		val &= ~(PTP_PIN_CFG_SYNC | PTP_PIN_CFG_ACTION_MASK |
+			 PTP_PIN_CFG_DOM);
+		val |= PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_DELTA);
+
+		ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
+
+		spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+	} else {
+		/* Fall back using ocelot_ptp_settime64 which is not exact. */
+		struct timespec64 ts;
+		u64 now;
+
+		ocelot_ptp_gettime64(ptp, &ts);
+
+		now = ktime_to_ns(timespec64_to_ktime(ts));
+		ts = ns_to_timespec64(now + delta);
+
+		ocelot_ptp_settime64(ptp, &ts);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_adjtime);
+
+int ocelot_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
+	u32 unit = 0, direction = 0;
+	unsigned long flags;
+	u64 adj = 0;
+
+	spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+
+	if (!scaled_ppm)
+		goto disable_adj;
+
+	if (scaled_ppm < 0) {
+		direction = PTP_CFG_CLK_ADJ_CFG_DIR;
+		scaled_ppm = -scaled_ppm;
+	}
+
+	adj = PSEC_PER_SEC << 16;
+	do_div(adj, scaled_ppm);
+	do_div(adj, 1000);
+
+	/* If the adjustment value is too large, use ns instead */
+	if (adj >= (1L << 30)) {
+		unit = PTP_CFG_CLK_ADJ_FREQ_NS;
+		do_div(adj, 1000);
+	}
+
+	/* Still too big */
+	if (adj >= (1L << 30))
+		goto disable_adj;
+
+	ocelot_write(ocelot, unit | adj, PTP_CLK_CFG_ADJ_FREQ);
+	ocelot_write(ocelot, PTP_CFG_CLK_ADJ_CFG_ENA | direction,
+		     PTP_CLK_CFG_ADJ_CFG);
+
+	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+	return 0;
+
+disable_adj:
+	ocelot_write(ocelot, 0, PTP_CLK_CFG_ADJ_CFG);
+
+	spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_adjfine);
+
+int ocelot_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
+		      enum ptp_pin_function func, unsigned int chan)
+{
+	switch (func) {
+	case PTP_PF_NONE:
+	case PTP_PF_PEROUT:
+		break;
+	case PTP_PF_EXTTS:
+	case PTP_PF_PHYSYNC:
+		return -1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_verify);
+
+int ocelot_ptp_enable(struct ptp_clock_info *ptp,
+		      struct ptp_clock_request *rq, int on)
+{
+	struct ocelot *ocelot = container_of(ptp, struct ocelot, ptp_info);
+	struct timespec64 ts_start, ts_period;
+	enum ocelot_ptp_pins ptp_pin;
+	unsigned long flags;
+	bool pps = false;
+	int pin = -1;
+	u32 val;
+	s64 ns;
+
+	switch (rq->type) {
+	case PTP_CLK_REQ_PEROUT:
+		/* Reject requests with unsupported flags */
+		if (rq->perout.flags)
+			return -EOPNOTSUPP;
+
+		pin = ptp_find_pin(ocelot->ptp_clock, PTP_PF_PEROUT,
+				   rq->perout.index);
+		if (pin == 0)
+			ptp_pin = PTP_PIN_0;
+		else if (pin == 1)
+			ptp_pin = PTP_PIN_1;
+		else if (pin == 2)
+			ptp_pin = PTP_PIN_2;
+		else if (pin == 3)
+			ptp_pin = PTP_PIN_3;
+		else
+			return -EBUSY;
+
+		ts_start.tv_sec = rq->perout.start.sec;
+		ts_start.tv_nsec = rq->perout.start.nsec;
+		ts_period.tv_sec = rq->perout.period.sec;
+		ts_period.tv_nsec = rq->perout.period.nsec;
+
+		if (ts_period.tv_sec == 1 && ts_period.tv_nsec == 0)
+			pps = true;
+
+		if (ts_start.tv_sec || (ts_start.tv_nsec && !pps)) {
+			dev_warn(ocelot->dev,
+				 "Absolute start time not supported!\n");
+			dev_warn(ocelot->dev,
+				 "Accept nsec for PPS phase adjustment, otherwise start time should be 0 0.\n");
+			return -EINVAL;
+		}
+
+		/* Handle turning off */
+		if (!on) {
+			spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+			val = PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_IDLE);
+			ocelot_write_rix(ocelot, val, PTP_PIN_CFG, ptp_pin);
+			spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+			break;
+		}
+
+		/* Handle PPS request */
+		if (pps) {
+			spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+			/* Pulse generated perout.start.nsec after TOD has
+			 * increased seconds.
+			 * Pulse width is set to 1us.
+			 */
+			ocelot_write_rix(ocelot, ts_start.tv_nsec,
+					 PTP_PIN_WF_LOW_PERIOD, ptp_pin);
+			ocelot_write_rix(ocelot, 1000,
+					 PTP_PIN_WF_HIGH_PERIOD, ptp_pin);
+			val = PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_CLOCK);
+			val |= PTP_PIN_CFG_SYNC;
+			ocelot_write_rix(ocelot, val, PTP_PIN_CFG, ptp_pin);
+			spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+			break;
+		}
+
+		/* Handle periodic clock */
+		ns = timespec64_to_ns(&ts_period);
+		ns = ns >> 1;
+		if (ns > 0x3fffffff || ns <= 0x6)
+			return -EINVAL;
+
+		spin_lock_irqsave(&ocelot->ptp_clock_lock, flags);
+		ocelot_write_rix(ocelot, ns, PTP_PIN_WF_LOW_PERIOD, ptp_pin);
+		ocelot_write_rix(ocelot, ns, PTP_PIN_WF_HIGH_PERIOD, ptp_pin);
+		val = PTP_PIN_CFG_ACTION(PTP_PIN_ACTION_CLOCK);
+		ocelot_write_rix(ocelot, val, PTP_PIN_CFG, ptp_pin);
+		spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_ptp_enable);
+
+int ocelot_init_timestamp(struct ocelot *ocelot, struct ptp_clock_info *info)
+{
+	struct ptp_clock *ptp_clock;
+	int i;
+
+	ocelot->ptp_info = *info;
+
+	for (i = 0; i < OCELOT_PTP_PINS_NUM; i++) {
+		struct ptp_pin_desc *p = &ocelot->ptp_pins[i];
+
+		snprintf(p->name, sizeof(p->name), "switch_1588_dat%d", i);
+		p->index = i;
+		p->func = PTP_PF_NONE;
+	}
+
+	ocelot->ptp_info.pin_config = &ocelot->ptp_pins[0];
+
+	ptp_clock = ptp_clock_register(&ocelot->ptp_info, ocelot->dev);
+	if (IS_ERR(ptp_clock))
+		return PTR_ERR(ptp_clock);
+	/* Check if PHC support is missing at the configuration level */
+	if (!ptp_clock)
+		return 0;
+
+	ocelot->ptp_clock = ptp_clock;
+
+	ocelot_write(ocelot, SYS_PTP_CFG_PTP_STAMP_WID(30), SYS_PTP_CFG);
+	ocelot_write(ocelot, 0xffffffff, ANA_TABLES_PTP_ID_LOW);
+	ocelot_write(ocelot, 0xffffffff, ANA_TABLES_PTP_ID_HIGH);
+
+	ocelot_write(ocelot, PTP_CFG_MISC_PTP_EN, PTP_CFG_MISC);
+
+	/* There is no device reconfiguration, PTP Rx stamping is always
+	 * enabled.
+	 */
+	ocelot->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_init_timestamp);
+
+int ocelot_deinit_timestamp(struct ocelot *ocelot)
+{
+	if (ocelot->ptp_clock)
+		ptp_clock_unregister(ocelot->ptp_clock);
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_deinit_timestamp);

drivers/net/ethernet/mscc/ocelot_regs.c

@@ -239,6 +239,8 @@ static const u32 ocelot_ptp_regmap[] = {
 	REG(PTP_PIN_TOD_SEC_MSB,           0x000004),
 	REG(PTP_PIN_TOD_SEC_LSB,           0x000008),
 	REG(PTP_PIN_TOD_NSEC,              0x00000c),
+	REG(PTP_PIN_WF_HIGH_PERIOD,        0x000014),
+	REG(PTP_PIN_WF_LOW_PERIOD,         0x000018),
 	REG(PTP_CFG_MISC,                  0x0000a0),
 	REG(PTP_CLK_CFG_ADJ_CFG,           0x0000a4),
 	REG(PTP_CLK_CFG_ADJ_FREQ,          0x0000a8),

include/soc/mscc/ocelot.h

@@ -92,6 +92,8 @@
 #define OCELOT_SPEED_100		2
 #define OCELOT_SPEED_10			3
 
+#define OCELOT_PTP_PINS_NUM		4
+
 #define TARGET_OFFSET			24
 #define REG_MASK			GENMASK(TARGET_OFFSET - 1, 0)
 #define REG(reg, offset)		[reg & REG_MASK] = offset
@@ -385,6 +387,8 @@ enum ocelot_reg {
 	PTP_PIN_TOD_SEC_MSB,
 	PTP_PIN_TOD_SEC_LSB,
 	PTP_PIN_TOD_NSEC,
+	PTP_PIN_WF_HIGH_PERIOD,
+	PTP_PIN_WF_LOW_PERIOD,
 	PTP_CFG_MISC,
 	PTP_CLK_CFG_ADJ_CFG,
 	PTP_CLK_CFG_ADJ_FREQ,
@@ -440,10 +444,11 @@ enum ocelot_regfield {
 	REGFIELD_MAX
 };
 
-enum ocelot_clk_pins {
-	ALT_PPS_PIN	= 1,
-	EXT_CLK_PIN,
-	ALT_LDST_PIN,
+enum ocelot_ptp_pins {
+	PTP_PIN_0,
+	PTP_PIN_1,
+	PTP_PIN_2,
+	PTP_PIN_3,
 	TOD_ACC_PIN
 };
 
@@ -549,6 +554,7 @@ struct ocelot {
 	struct mutex			ptp_lock;
 	/* Protects the PTP clock */
 	spinlock_t			ptp_clock_lock;
+	struct ptp_pin_desc		ptp_pins[OCELOT_PTP_PINS_NUM];
 };
 
 struct ocelot_policer {
@@ -620,7 +626,6 @@ int ocelot_vlan_add(struct ocelot *ocelot, int port, u16 vid, bool pvid,
 int ocelot_vlan_del(struct ocelot *ocelot, int port, u16 vid);
 int ocelot_hwstamp_get(struct ocelot *ocelot, int port, struct ifreq *ifr);
 int ocelot_hwstamp_set(struct ocelot *ocelot, int port, struct ifreq *ifr);
-int ocelot_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts);
 int ocelot_port_add_txtstamp_skb(struct ocelot_port *ocelot_port,
 				 struct sk_buff *skb);
 void ocelot_get_txtstamp(struct ocelot *ocelot);

drivers/net/ethernet/mscc/ocelot_ptp.h → include/soc/mscc/ocelot_ptp.h

@@ -4,15 +4,21 @@
  *
  * License: Dual MIT/GPL
  * Copyright (c) 2017 Microsemi Corporation
+ * Copyright 2020 NXP
  */
 
 #ifndef _MSCC_OCELOT_PTP_H_
 #define _MSCC_OCELOT_PTP_H_
 
+#include <linux/ptp_clock_kernel.h>
+#include <soc/mscc/ocelot.h>
+
 #define PTP_PIN_CFG_RSZ			0x20
 #define PTP_PIN_TOD_SEC_MSB_RSZ		PTP_PIN_CFG_RSZ
 #define PTP_PIN_TOD_SEC_LSB_RSZ		PTP_PIN_CFG_RSZ
 #define PTP_PIN_TOD_NSEC_RSZ		PTP_PIN_CFG_RSZ
+#define PTP_PIN_WF_HIGH_PERIOD_RSZ	PTP_PIN_CFG_RSZ
+#define PTP_PIN_WF_LOW_PERIOD_RSZ	PTP_PIN_CFG_RSZ
 
 #define PTP_PIN_CFG_DOM			BIT(0)
 #define PTP_PIN_CFG_SYNC		BIT(2)
@@ -38,4 +44,15 @@ enum {
 
 #define PTP_CFG_CLK_ADJ_FREQ_NS		BIT(30)
 
+int ocelot_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts);
+int ocelot_ptp_settime64(struct ptp_clock_info *ptp,
+			 const struct timespec64 *ts);
+int ocelot_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta);
+int ocelot_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm);
+int ocelot_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
+		      enum ptp_pin_function func, unsigned int chan);
+int ocelot_ptp_enable(struct ptp_clock_info *ptp,
+		      struct ptp_clock_request *rq, int on);
+int ocelot_init_timestamp(struct ocelot *ocelot, struct ptp_clock_info *info);
+int ocelot_deinit_timestamp(struct ocelot *ocelot);
 #endif