ptp: Added a clock driver for the National Semiconductor PHYTER.

This patch adds support for the PTP clock found on the DP83640.
The basic clock operations and one external time stamp have
been implemented.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: John Stultz <john.stultz@linaro.org>

4 files changed, 1387 insertions, 0 deletions

diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 13bebab65d02..2333215bbb32 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_FIXED_PHY)		+= fixed.o
 obj-$(CONFIG_MDIO_BITBANG)	+= mdio-bitbang.o
 obj-$(CONFIG_MDIO_GPIO)		+= mdio-gpio.o
 obj-$(CONFIG_NATIONAL_PHY)	+= national.o
+obj-$(CONFIG_DP83640_PHY)	+= dp83640.o
 obj-$(CONFIG_STE10XP)		+= ste10Xp.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o
 obj-$(CONFIG_MDIO_OCTEON)	+= mdio-octeon.o
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
new file mode 100644
index 000000000000..d463b8a4afa1
--- /dev/null
+++ b/drivers/net/phy/dp83640.c
@@ -0,0 +1,1100 @@
+/*
+ * Driver for the National Semiconductor DP83640 PHYTER
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/ethtool.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mii.h>
+#include <linux/module.h>
+#include <linux/net_tstamp.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/ptp_classify.h>
+#include <linux/ptp_clock_kernel.h>
+
+#include "dp83640_reg.h"
+
+#define DP83640_PHY_ID	0x20005ce1
+#define PAGESEL		0x13
+#define LAYER4		0x02
+#define LAYER2		0x01
+#define MAX_RXTS	4
+#define MAX_TXTS	4
+#define N_EXT_TS	1
+#define PSF_PTPVER	2
+#define PSF_EVNT	0x4000
+#define PSF_RX		0x2000
+#define PSF_TX		0x1000
+#define EXT_EVENT	1
+#define EXT_GPIO	1
+#define CAL_EVENT	2
+#define CAL_GPIO	9
+#define CAL_TRIGGER	2
+
+/* phyter seems to miss the mark by 16 ns */
+#define ADJTIME_FIX	16
+
+#if defined(__BIG_ENDIAN)
+#define ENDIAN_FLAG	0
+#elif defined(__LITTLE_ENDIAN)
+#define ENDIAN_FLAG	PSF_ENDIAN
+#endif
+
+#define SKB_PTP_TYPE(__skb) (*(unsigned int *)((__skb)->cb))
+
+struct phy_rxts {
+	u16 ns_lo;   /* ns[15:0] */
+	u16 ns_hi;   /* overflow[1:0], ns[29:16] */
+	u16 sec_lo;  /* sec[15:0] */
+	u16 sec_hi;  /* sec[31:16] */
+	u16 seqid;   /* sequenceId[15:0] */
+	u16 msgtype; /* messageType[3:0], hash[11:0] */
+};
+
+struct phy_txts {
+	u16 ns_lo;   /* ns[15:0] */
+	u16 ns_hi;   /* overflow[1:0], ns[29:16] */
+	u16 sec_lo;  /* sec[15:0] */
+	u16 sec_hi;  /* sec[31:16] */
+};
+
+struct rxts {
+	struct list_head list;
+	unsigned long tmo;
+	u64 ns;
+	u16 seqid;
+	u8  msgtype;
+	u16 hash;
+};
+
+struct dp83640_clock;
+
+struct dp83640_private {
+	struct list_head list;
+	struct dp83640_clock *clock;
+	struct phy_device *phydev;
+	struct work_struct ts_work;
+	int hwts_tx_en;
+	int hwts_rx_en;
+	int layer;
+	int version;
+	/* remember state of cfg0 during calibration */
+	int cfg0;
+	/* remember the last event time stamp */
+	struct phy_txts edata;
+	/* list of rx timestamps */
+	struct list_head rxts;
+	struct list_head rxpool;
+	struct rxts rx_pool_data[MAX_RXTS];
+	/* protects above three fields from concurrent access */
+	spinlock_t rx_lock;
+	/* queues of incoming and outgoing packets */
+	struct sk_buff_head rx_queue;
+	struct sk_buff_head tx_queue;
+};
+
+struct dp83640_clock {
+	/* keeps the instance in the 'phyter_clocks' list */
+	struct list_head list;
+	/* we create one clock instance per MII bus */
+	struct mii_bus *bus;
+	/* protects extended registers from concurrent access */
+	struct mutex extreg_lock;
+	/* remembers which page was last selected */
+	int page;
+	/* our advertised capabilities */
+	struct ptp_clock_info caps;
+	/* protects the three fields below from concurrent access */
+	struct mutex clock_lock;
+	/* the one phyter from which we shall read */
+	struct dp83640_private *chosen;
+	/* list of the other attached phyters, not chosen */
+	struct list_head phylist;
+	/* reference to our PTP hardware clock */
+	struct ptp_clock *ptp_clock;
+};
+
+/* globals */
+
+static int chosen_phy = -1;
+static ushort cal_gpio = 4;
+
+module_param(chosen_phy, int, 0444);
+module_param(cal_gpio, ushort, 0444);
+
+MODULE_PARM_DESC(chosen_phy, \
+	"The address of the PHY to use for the ancillary clock features");
+MODULE_PARM_DESC(cal_gpio, \
+	"Which GPIO line to use for synchronizing multiple PHYs");
+
+/* a list of clocks and a mutex to protect it */
+static LIST_HEAD(phyter_clocks);
+static DEFINE_MUTEX(phyter_clocks_lock);
+
+static void rx_timestamp_work(struct work_struct *work);
+
+/* extended register access functions */
+
+#define BROADCAST_ADDR 31
+
+static inline int broadcast_write(struct mii_bus *bus, u32 regnum, u16 val)
+{
+	return mdiobus_write(bus, BROADCAST_ADDR, regnum, val);
+}
+
+/* Caller must hold extreg_lock. */
+static int ext_read(struct phy_device *phydev, int page, u32 regnum)
+{
+	struct dp83640_private *dp83640 = phydev->priv;
+	int val;
+
+	if (dp83640->clock->page != page) {
+		broadcast_write(phydev->bus, PAGESEL, page);
+		dp83640->clock->page = page;
+	}
+	val = phy_read(phydev, regnum);
+
+	return val;
+}
+
+/* Caller must hold extreg_lock. */
+static void ext_write(int broadcast, struct phy_device *phydev,
+		      int page, u32 regnum, u16 val)
+{
+	struct dp83640_private *dp83640 = phydev->priv;
+
+	if (dp83640->clock->page != page) {
+		broadcast_write(phydev->bus, PAGESEL, page);
+		dp83640->clock->page = page;
+	}
+	if (broadcast)
+		broadcast_write(phydev->bus, regnum, val);
+	else
+		phy_write(phydev, regnum, val);
+}
+
+/* Caller must hold extreg_lock. */
+static int tdr_write(int bc, struct phy_device *dev,
+		     const struct timespec *ts, u16 cmd)
+{
+	ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec & 0xffff);/* ns[15:0]  */
+	ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_nsec >> 16);   /* ns[31:16] */
+	ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec & 0xffff); /* sec[15:0] */
+	ext_write(bc, dev, PAGE4, PTP_TDR, ts->tv_sec >> 16);    /* sec[31:16]*/
+
+	ext_write(bc, dev, PAGE4, PTP_CTL, cmd);
+
+	return 0;
+}
+
+/* convert phy timestamps into driver timestamps */
+
+static void phy2rxts(struct phy_rxts *p, struct rxts *rxts)
+{
+	u32 sec;
+
+	sec = p->sec_lo;
+	sec |= p->sec_hi << 16;
+
+	rxts->ns = p->ns_lo;
+	rxts->ns |= (p->ns_hi & 0x3fff) << 16;
+	rxts->ns += ((u64)sec) * 1000000000ULL;
+	rxts->seqid = p->seqid;
+	rxts->msgtype = (p->msgtype >> 12) & 0xf;
+	rxts->hash = p->msgtype & 0x0fff;
+	rxts->tmo = jiffies + HZ;
+}
+
+static u64 phy2txts(struct phy_txts *p)
+{
+	u64 ns;
+	u32 sec;
+
+	sec = p->sec_lo;
+	sec |= p->sec_hi << 16;
+
+	ns = p->ns_lo;
+	ns |= (p->ns_hi & 0x3fff) << 16;
+	ns += ((u64)sec) * 1000000000ULL;
+
+	return ns;
+}
+
+/* ptp clock methods */
+
+static int ptp_dp83640_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+	struct dp83640_clock *clock =
+		container_of(ptp, struct dp83640_clock, caps);
+	struct phy_device *phydev = clock->chosen->phydev;
+	u64 rate;
+	int neg_adj = 0;
+	u16 hi, lo;
+
+	if (ppb < 0) {
+		neg_adj = 1;
+		ppb = -ppb;
+	}
+	rate = ppb;
+	rate <<= 26;
+	rate = div_u64(rate, 1953125);
+
+	hi = (rate >> 16) & PTP_RATE_HI_MASK;
+	if (neg_adj)
+		hi |= PTP_RATE_DIR;
+
+	lo = rate & 0xffff;
+
+	mutex_lock(&clock->extreg_lock);
+
+	ext_write(1, phydev, PAGE4, PTP_RATEH, hi);
+	ext_write(1, phydev, PAGE4, PTP_RATEL, lo);
+
+	mutex_unlock(&clock->extreg_lock);
+
+	return 0;
+}
+
+static int ptp_dp83640_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct dp83640_clock *clock =
+		container_of(ptp, struct dp83640_clock, caps);
+	struct phy_device *phydev = clock->chosen->phydev;
+	struct timespec ts;
+	int err;
+
+	delta += ADJTIME_FIX;
+
+	ts = ns_to_timespec(delta);
+
+	mutex_lock(&clock->extreg_lock);
+
+	err = tdr_write(1, phydev, &ts, PTP_STEP_CLK);
+
+	mutex_unlock(&clock->extreg_lock);
+
+	return err;
+}
+
+static int ptp_dp83640_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+	struct dp83640_clock *clock =
+		container_of(ptp, struct dp83640_clock, caps);
+	struct phy_device *phydev = clock->chosen->phydev;
+	unsigned int val[4];
+
+	mutex_lock(&clock->extreg_lock);
+
+	ext_write(0, phydev, PAGE4, PTP_CTL, PTP_RD_CLK);
+
+	val[0] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[15:0] */
+	val[1] = ext_read(phydev, PAGE4, PTP_TDR); /* ns[31:16] */
+	val[2] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[15:0] */
+	val[3] = ext_read(phydev, PAGE4, PTP_TDR); /* sec[31:16] */
+
+	mutex_unlock(&clock->extreg_lock);
+
+	ts->tv_nsec = val[0] | (val[1] << 16);
+	ts->tv_sec  = val[2] | (val[3] << 16);
+
+	return 0;
+}
+
+static int ptp_dp83640_settime(struct ptp_clock_info *ptp,
+			       const struct timespec *ts)
+{
+	struct dp83640_clock *clock =
+		container_of(ptp, struct dp83640_clock, caps);
+	struct phy_device *phydev = clock->chosen->phydev;
+	int err;
+
+	mutex_lock(&clock->extreg_lock);
+
+	err = tdr_write(1, phydev, ts, PTP_LOAD_CLK);
+
+	mutex_unlock(&clock->extreg_lock);
+
+	return err;
+}
+
+static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
+			      struct ptp_clock_request *rq, int on)
+{
+	struct dp83640_clock *clock =
+		container_of(ptp, struct dp83640_clock, caps);
+	struct phy_device *phydev = clock->chosen->phydev;
+	u16 evnt;
+
+	switch (rq->type) {
+	case PTP_CLK_REQ_EXTTS:
+		if (rq->extts.index != 0)
+			return -EINVAL;
+		evnt = EVNT_WR | (EXT_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
+		if (on) {
+			evnt |= (EXT_GPIO & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
+			evnt |= EVNT_RISE;
+		}
+		ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
+		return 0;
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };
+static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
+
+static void enable_status_frames(struct phy_device *phydev, bool on)
+{
+	u16 cfg0 = 0, ver;
+
+	if (on)
+		cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;
+
+	ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
+
+	ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
+	ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
+
+	if (!phydev->attached_dev) {
+		pr_warning("dp83640: expected to find an attached netdevice\n");
+		return;
+	}
+
+	if (on) {
+		if (dev_mc_add(phydev->attached_dev, status_frame_dst))
+			pr_warning("dp83640: failed to add mc address\n");
+	} else {
+		if (dev_mc_del(phydev->attached_dev, status_frame_dst))
+			pr_warning("dp83640: failed to delete mc address\n");
+	}
+}
+
+static bool is_status_frame(struct sk_buff *skb, int type)
+{
+	struct ethhdr *h = eth_hdr(skb);
+
+	if (PTP_CLASS_V2_L2 == type &&
+	    !memcmp(h->h_source, status_frame_src, sizeof(status_frame_src)))
+		return true;
+	else
+		return false;
+}
+
+static int expired(struct rxts *rxts)
+{
+	return time_after(jiffies, rxts->tmo);
+}
+
+/* Caller must hold rx_lock. */
+static void prune_rx_ts(struct dp83640_private *dp83640)
+{
+	struct list_head *this, *next;
+	struct rxts *rxts;
+
+	list_for_each_safe(this, next, &dp83640->rxts) {
+		rxts = list_entry(this, struct rxts, list);
+		if (expired(rxts)) {
+			list_del_init(&rxts->list);
+			list_add(&rxts->list, &dp83640->rxpool);
+		}
+	}
+}
+
+/* synchronize the phyters so they act as one clock */
+
+static void enable_broadcast(struct phy_device *phydev, int init_page, int on)
+{
+	int val;
+	phy_write(phydev, PAGESEL, 0);
+	val = phy_read(phydev, PHYCR2);
+	if (on)
+		val |= BC_WRITE;
+	else
+		val &= ~BC_WRITE;
+	phy_write(phydev, PHYCR2, val);
+	phy_write(phydev, PAGESEL, init_page);
+}
+
+static void recalibrate(struct dp83640_clock *clock)
+{
+	s64 now, diff;
+	struct phy_txts event_ts;
+	struct timespec ts;
+	struct list_head *this;
+	struct dp83640_private *tmp;
+	struct phy_device *master = clock->chosen->phydev;
+	u16 cfg0, evnt, ptp_trig, trigger, val;
+
+	trigger = CAL_TRIGGER;
+
+	mutex_lock(&clock->extreg_lock);
+
+	/*
+	 * enable broadcast, disable status frames, enable ptp clock
+	 */
+	list_for_each(this, &clock->phylist) {
+		tmp = list_entry(this, struct dp83640_private, list);
+		enable_broadcast(tmp->phydev, clock->page, 1);
+		tmp->cfg0 = ext_read(tmp->phydev, PAGE5, PSF_CFG0);
+		ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, 0);
+		ext_write(0, tmp->phydev, PAGE4, PTP_CTL, PTP_ENABLE);
+	}
+	enable_broadcast(master, clock->page, 1);
+	cfg0 = ext_read(master, PAGE5, PSF_CFG0);
+	ext_write(0, master, PAGE5, PSF_CFG0, 0);
+	ext_write(0, master, PAGE4, PTP_CTL, PTP_ENABLE);
+
+	/*
+	 * enable an event timestamp
+	 */
+	evnt = EVNT_WR | EVNT_RISE | EVNT_SINGLE;
+	evnt |= (CAL_EVENT & EVNT_SEL_MASK) << EVNT_SEL_SHIFT;
+	evnt |= (cal_gpio & EVNT_GPIO_MASK) << EVNT_GPIO_SHIFT;
+
+	list_for_each(this, &clock->phylist) {
+		tmp = list_entry(this, struct dp83640_private, list);
+		ext_write(0, tmp->phydev, PAGE5, PTP_EVNT, evnt);
+	}
+	ext_write(0, master, PAGE5, PTP_EVNT, evnt);
+
+	/*
+	 * configure a trigger
+	 */
+	ptp_trig = TRIG_WR | TRIG_IF_LATE | TRIG_PULSE;
+	ptp_trig |= (trigger  & TRIG_CSEL_MASK) << TRIG_CSEL_SHIFT;
+	ptp_trig |= (cal_gpio & TRIG_GPIO_MASK) << TRIG_GPIO_SHIFT;
+	ext_write(0, master, PAGE5, PTP_TRIG, ptp_trig);
+
+	/* load trigger */
+	val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
+	val |= TRIG_LOAD;
+	ext_write(0, master, PAGE4, PTP_CTL, val);
+
+	/* enable trigger */
+	val &= ~TRIG_LOAD;
+	val |= TRIG_EN;
+	ext_write(0, master, PAGE4, PTP_CTL, val);
+
+	/* disable trigger */
+	val = (trigger & TRIG_SEL_MASK) << TRIG_SEL_SHIFT;
+	val |= TRIG_DIS;
+	ext_write(0, master, PAGE4, PTP_CTL, val);
+
+	/*
+	 * read out and correct offsets
+	 */
+	val = ext_read(master, PAGE4, PTP_STS);
+	pr_info("master PTP_STS  0x%04hx", val);
+	val = ext_read(master, PAGE4, PTP_ESTS);
+	pr_info("master PTP_ESTS 0x%04hx", val);
+	event_ts.ns_lo  = ext_read(master, PAGE4, PTP_EDATA);
+	event_ts.ns_hi  = ext_read(master, PAGE4, PTP_EDATA);
+	event_ts.sec_lo = ext_read(master, PAGE4, PTP_EDATA);
+	event_ts.sec_hi = ext_read(master, PAGE4, PTP_EDATA);
+	now = phy2txts(&event_ts);
+
+	list_for_each(this, &clock->phylist) {
+		tmp = list_entry(this, struct dp83640_private, list);
+		val = ext_read(tmp->phydev, PAGE4, PTP_STS);
+		pr_info("slave  PTP_STS  0x%04hx", val);
+		val = ext_read(tmp->phydev, PAGE4, PTP_ESTS);
+		pr_info("slave  PTP_ESTS 0x%04hx", val);
+		event_ts.ns_lo  = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
+		event_ts.ns_hi  = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
+		event_ts.sec_lo = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
+		event_ts.sec_hi = ext_read(tmp->phydev, PAGE4, PTP_EDATA);
+		diff = now - (s64) phy2txts(&event_ts);
+		pr_info("slave offset %lld nanoseconds\n", diff);
+		diff += ADJTIME_FIX;
+		ts = ns_to_timespec(diff);
+		tdr_write(0, tmp->phydev, &ts, PTP_STEP_CLK);
+	}
+
+	/*
+	 * restore status frames
+	 */
+	list_for_each(this, &clock->phylist) {
+		tmp = list_entry(this, struct dp83640_private, list);
+		ext_write(0, tmp->phydev, PAGE5, PSF_CFG0, tmp->cfg0);
+	}
+	ext_write(0, master, PAGE5, PSF_CFG0, cfg0);
+
+	mutex_unlock(&clock->extreg_lock);
+}
+
+/* time stamping methods */
+
+static void decode_evnt(struct dp83640_private *dp83640,
+			struct phy_txts *phy_txts, u16 ests)
+{
+	struct ptp_clock_event event;
+	int words = (ests >> EVNT_TS_LEN_SHIFT) & EVNT_TS_LEN_MASK;
+
+	switch (words) { /* fall through in every case */
+	case 3:
+		dp83640->edata.sec_hi = phy_txts->sec_hi;
+	case 2:
+		dp83640->edata.sec_lo = phy_txts->sec_lo;
+	case 1:
+		dp83640->edata.ns_hi = phy_txts->ns_hi;
+	case 0:
+		dp83640->edata.ns_lo = phy_txts->ns_lo;
+	}
+
+	event.type = PTP_CLOCK_EXTTS;
+	event.index = 0;
+	event.timestamp = phy2txts(&dp83640->edata);
+
+	ptp_clock_event(dp83640->clock->ptp_clock, &event);
+}
+
+static void decode_rxts(struct dp83640_private *dp83640,
+			struct phy_rxts *phy_rxts)
+{
+	struct rxts *rxts;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dp83640->rx_lock, flags);
+
+	prune_rx_ts(dp83640);
+
+	if (list_empty(&dp83640->rxpool)) {
+		pr_warning("dp83640: rx timestamp pool is empty\n");
+		goto out;
+	}
+	rxts = list_first_entry(&dp83640->rxpool, struct rxts, list);
+	list_del_init(&rxts->list);
+	phy2rxts(phy_rxts, rxts);
+	list_add_tail(&rxts->list, &dp83640->rxts);
+out:
+	spin_unlock_irqrestore(&dp83640->rx_lock, flags);
+}
+
+static void decode_txts(struct dp83640_private *dp83640,
+			struct phy_txts *phy_txts)
+{
+	struct skb_shared_hwtstamps shhwtstamps;
+	struct sk_buff *skb;
+	u64 ns;
+
+	/* We must already have the skb that triggered this. */
+
+	skb = skb_dequeue(&dp83640->tx_queue);
+
+	if (!skb) {
+		pr_warning("dp83640: have timestamp but tx_queue empty\n");
+		return;
+	}
+	ns = phy2txts(phy_txts);
+	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+	shhwtstamps.hwtstamp = ns_to_ktime(ns);
+	skb_complete_tx_timestamp(skb, &shhwtstamps);
+}
+
+static void decode_status_frame(struct dp83640_private *dp83640,
+				struct sk_buff *skb)
+{
+	struct phy_rxts *phy_rxts;
+	struct phy_txts *phy_txts;
+	u8 *ptr;
+	int len, size;
+	u16 ests, type;
+
+	ptr = skb->data + 2;
+
+	for (len = skb_headlen(skb) - 2; len > sizeof(type); len -= size) {
+
+		type = *(u16 *)ptr;
+		ests = type & 0x0fff;
+		type = type & 0xf000;
+		len -= sizeof(type);
+		ptr += sizeof(type);
+
+		if (PSF_RX == type && len >= sizeof(*phy_rxts)) {
+
+			phy_rxts = (struct phy_rxts *) ptr;
+			decode_rxts(dp83640, phy_rxts);
+			size = sizeof(*phy_rxts);
+
+		} else if (PSF_TX == type && len >= sizeof(*phy_txts)) {
+
+			phy_txts = (struct phy_txts *) ptr;
+			decode_txts(dp83640, phy_txts);
+			size = sizeof(*phy_txts);
+
+		} else if (PSF_EVNT == type && len >= sizeof(*phy_txts)) {
+
+			phy_txts = (struct phy_txts *) ptr;
+			decode_evnt(dp83640, phy_txts, ests);
+			size = sizeof(*phy_txts);
+
+		} else {
+			size = 0;
+			break;
+		}
+		ptr += size;
+	}
+}
+
+static int match(struct sk_buff *skb, unsigned int type, struct rxts *rxts)
+{
+	u16 *seqid;
+	unsigned int offset;
+	u8 *msgtype, *data = skb_mac_header(skb);
+
+	/* check sequenceID, messageType, 12 bit hash of offset 20-29 */
+
+	switch (type) {
+	case PTP_CLASS_V1_IPV4:
+	case PTP_CLASS_V2_IPV4:
+		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
+		break;
+	case PTP_CLASS_V1_IPV6:
+	case PTP_CLASS_V2_IPV6:
+		offset = OFF_PTP6;
+		break;
+	case PTP_CLASS_V2_L2:
+		offset = ETH_HLEN;
+		break;
+	case PTP_CLASS_V2_VLAN:
+		offset = ETH_HLEN + VLAN_HLEN;
+		break;
+	default:
+		return 0;
+	}
+
+	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
+		return 0;
+
+	if (unlikely(type & PTP_CLASS_V1))
+		msgtype = data + offset + OFF_PTP_CONTROL;
+	else
+		msgtype = data + offset;
+
+	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
+
+	return (rxts->msgtype == (*msgtype & 0xf) &&
+		rxts->seqid   == ntohs(*seqid));
+}
+
+static void dp83640_free_clocks(void)
+{
+	struct dp83640_clock *clock;
+	struct list_head *this, *next;
+
+	mutex_lock(&phyter_clocks_lock);
+
+	list_for_each_safe(this, next, &phyter_clocks) {
+		clock = list_entry(this, struct dp83640_clock, list);
+		if (!list_empty(&clock->phylist)) {
+			pr_warning("phy list non-empty while unloading");
+			BUG();
+		}
+		list_del(&clock->list);
+		mutex_destroy(&clock->extreg_lock);
+		mutex_destroy(&clock->clock_lock);
+		put_device(&clock->bus->dev);
+		kfree(clock);
+	}
+
+	mutex_unlock(&phyter_clocks_lock);
+}
+
+static void dp83640_clock_init(struct dp83640_clock *clock, struct mii_bus *bus)
+{
+	INIT_LIST_HEAD(&clock->list);
+	clock->bus = bus;
+	mutex_init(&clock->extreg_lock);
+	mutex_init(&clock->clock_lock);
+	INIT_LIST_HEAD(&clock->phylist);
+	clock->caps.owner = THIS_MODULE;
+	sprintf(clock->caps.name, "dp83640 timer");
+	clock->caps.max_adj	= 1953124;
+	clock->caps.n_alarm	= 0;
+	clock->caps.n_ext_ts	= N_EXT_TS;
+	clock->caps.n_per_out	= 0;
+	clock->caps.pps		= 0;
+	clock->caps.adjfreq	= ptp_dp83640_adjfreq;
+	clock->caps.adjtime	= ptp_dp83640_adjtime;
+	clock->caps.gettime	= ptp_dp83640_gettime;
+	clock->caps.settime	= ptp_dp83640_settime;
+	clock->caps.enable	= ptp_dp83640_enable;
+	/*
+	 * Get a reference to this bus instance.
+	 */
+	get_device(&bus->dev);
+}
+
+static int choose_this_phy(struct dp83640_clock *clock,
+			   struct phy_device *phydev)
+{
+	if (chosen_phy == -1 && !clock->chosen)
+		return 1;
+
+	if (chosen_phy == phydev->addr)
+		return 1;
+
+	return 0;
+}
+
+static struct dp83640_clock *dp83640_clock_get(struct dp83640_clock *clock)
+{
+	if (clock)
+		mutex_lock(&clock->clock_lock);
+	return clock;
+}
+
+/*
+ * Look up and lock a clock by bus instance.
+ * If there is no clock for this bus, then create it first.
+ */
+static struct dp83640_clock *dp83640_clock_get_bus(struct mii_bus *bus)
+{
+	struct dp83640_clock *clock = NULL, *tmp;
+	struct list_head *this;
+
+	mutex_lock(&phyter_clocks_lock);
+
+	list_for_each(this, &phyter_clocks) {
+		tmp = list_entry(this, struct dp83640_clock, list);
+		if (tmp->bus == bus) {
+			clock = tmp;
+			break;
+		}
+	}
+	if (clock)
+		goto out;
+
+	clock = kzalloc(sizeof(struct dp83640_clock), GFP_KERNEL);
+	if (!clock)
+		goto out;
+
+	dp83640_clock_init(clock, bus);
+	list_add_tail(&phyter_clocks, &clock->list);
+out:
+	mutex_unlock(&phyter_clocks_lock);
+
+	return dp83640_clock_get(clock);
+}
+
+static void dp83640_clock_put(struct dp83640_clock *clock)
+{
+	mutex_unlock(&clock->clock_lock);
+}
+
+static int dp83640_probe(struct phy_device *phydev)
+{
+	struct dp83640_clock *clock;
+	struct dp83640_private *dp83640;
+	int err = -ENOMEM, i;
+
+	if (phydev->addr == BROADCAST_ADDR)
+		return 0;
+
+	clock = dp83640_clock_get_bus(phydev->bus);
+	if (!clock)
+		goto no_clock;
+
+	dp83640 = kzalloc(sizeof(struct dp83640_private), GFP_KERNEL);
+	if (!dp83640)
+		goto no_memory;
+
+	dp83640->phydev = phydev;
+	INIT_WORK(&dp83640->ts_work, rx_timestamp_work);
+
+	INIT_LIST_HEAD(&dp83640->rxts);
+	INIT_LIST_HEAD(&dp83640->rxpool);
+	for (i = 0; i < MAX_RXTS; i++)
+		list_add(&dp83640->rx_pool_data[i].list, &dp83640->rxpool);
+
+	phydev->priv = dp83640;
+
+	spin_lock_init(&dp83640->rx_lock);
+	skb_queue_head_init(&dp83640->rx_queue);
+	skb_queue_head_init(&dp83640->tx_queue);
+
+	dp83640->clock = clock;
+
+	if (choose_this_phy(clock, phydev)) {
+		clock->chosen = dp83640;
+		clock->ptp_clock = ptp_clock_register(&clock->caps);
+		if (IS_ERR(clock->ptp_clock)) {
+			err = PTR_ERR(clock->ptp_clock);
+			goto no_register;
+		}
+	} else
+		list_add_tail(&dp83640->list, &clock->phylist);
+
+	if (clock->chosen && !list_empty(&clock->phylist))
+		recalibrate(clock);
+	else
+		enable_broadcast(dp83640->phydev, clock->page, 1);
+
+	dp83640_clock_put(clock);
+	return 0;
+
+no_register:
+	clock->chosen = NULL;
+	kfree(dp83640);
+no_memory:
+	dp83640_clock_put(clock);
+no_clock:
+	return err;
+}
+
+static void dp83640_remove(struct phy_device *phydev)
+{
+	struct dp83640_clock *clock;
+	struct list_head *this, *next;
+	struct dp83640_private *tmp, *dp83640 = phydev->priv;
+
+	if (phydev->addr == BROADCAST_ADDR)
+		return;
+
+	enable_status_frames(phydev, false);
+	cancel_work_sync(&dp83640->ts_work);
+
+	clock = dp83640_clock_get(dp83640->clock);
+
+	if (dp83640 == clock->chosen) {
+		ptp_clock_unregister(clock->ptp_clock);
+		clock->chosen = NULL;
+	} else {
+		list_for_each_safe(this, next, &clock->phylist) {
+			tmp = list_entry(this, struct dp83640_private, list);
+			if (tmp == dp83640) {
+				list_del_init(&tmp->list);
+				break;
+			}
+		}
+	}
+
+	dp83640_clock_put(clock);
+	kfree(dp83640);
+}
+
+static int dp83640_hwtstamp(struct phy_device *phydev, struct ifreq *ifr)
+{
+	struct dp83640_private *dp83640 = phydev->priv;
+	struct hwtstamp_config cfg;
+	u16 txcfg0, rxcfg0;
+
+	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
+		return -EFAULT;
+
+	if (cfg.flags) /* reserved for future extensions */
+		return -EINVAL;
+
+	switch (cfg.tx_type) {
+	case HWTSTAMP_TX_OFF:
+		dp83640->hwts_tx_en = 0;
+		break;
+	case HWTSTAMP_TX_ON:
+		dp83640->hwts_tx_en = 1;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (cfg.rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		dp83640->hwts_rx_en = 0;
+		dp83640->layer = 0;
+		dp83640->version = 0;
+		break;
+	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+		dp83640->hwts_rx_en = 1;
+		dp83640->layer = LAYER4;
+		dp83640->version = 1;
+		break;
+	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+		dp83640->hwts_rx_en = 1;
+		dp83640->layer = LAYER4;
+		dp83640->version = 2;
+		break;
+	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+		dp83640->hwts_rx_en = 1;
+		dp83640->layer = LAYER2;
+		dp83640->version = 2;
+		break;
+	case HWTSTAMP_FILTER_PTP_V2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+		dp83640->hwts_rx_en = 1;
+		dp83640->layer = LAYER4|LAYER2;
+		dp83640->version = 2;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	txcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
+	rxcfg0 = (dp83640->version & TX_PTP_VER_MASK) << TX_PTP_VER_SHIFT;
+
+	if (dp83640->layer & LAYER2) {
+		txcfg0 |= TX_L2_EN;
+		rxcfg0 |= RX_L2_EN;
+	}
+	if (dp83640->layer & LAYER4) {
+		txcfg0 |= TX_IPV6_EN | TX_IPV4_EN;
+		rxcfg0 |= RX_IPV6_EN | RX_IPV4_EN;
+	}
+
+	if (dp83640->hwts_tx_en)
+		txcfg0 |= TX_TS_EN;
+
+	if (dp83640->hwts_rx_en)
+		rxcfg0 |= RX_TS_EN;
+
+	mutex_lock(&dp83640->clock->extreg_lock);
+
+	if (dp83640->hwts_tx_en || dp83640->hwts_rx_en) {
+		enable_status_frames(phydev, true);
+		ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE);
+	}
+
+	ext_write(0, phydev, PAGE5, PTP_TXCFG0, txcfg0);
+	ext_write(0, phydev, PAGE5, PTP_RXCFG0, rxcfg0);
+
+	mutex_unlock(&dp83640->clock->extreg_lock);
+
+	return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
+}
+
+static void rx_timestamp_work(struct work_struct *work)
+{
+	struct dp83640_private *dp83640 =
+		container_of(work, struct dp83640_private, ts_work);
+	struct list_head *this, *next;
+	struct rxts *rxts;
+	struct skb_shared_hwtstamps *shhwtstamps;
+	struct sk_buff *skb;
+	unsigned int type;
+	unsigned long flags;
+
+	/* Deliver each deferred packet, with or without a time stamp. */
+
+	while ((skb = skb_dequeue(&dp83640->rx_queue)) != NULL) {
+		type = SKB_PTP_TYPE(skb);
+		spin_lock_irqsave(&dp83640->rx_lock, flags);
+		list_for_each_safe(this, next, &dp83640->rxts) {
+			rxts = list_entry(this, struct rxts, list);
+			if (match(skb, type, rxts)) {
+				shhwtstamps = skb_hwtstamps(skb);
+				memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+				shhwtstamps->hwtstamp = ns_to_ktime(rxts->ns);
+				list_del_init(&rxts->list);
+				list_add(&rxts->list, &dp83640->rxpool);
+				break;
+			}
+		}
+		spin_unlock_irqrestore(&dp83640->rx_lock, flags);
+		netif_rx(skb);
+	}
+
+	/* Clear out expired time stamps. */
+
+	spin_lock_irqsave(&dp83640->rx_lock, flags);
+	prune_rx_ts(dp83640);
+	spin_unlock_irqrestore(&dp83640->rx_lock, flags);
+}
+
+static bool dp83640_rxtstamp(struct phy_device *phydev,
+			     struct sk_buff *skb, int type)
+{
+	struct dp83640_private *dp83640 = phydev->priv;
+
+	if (!dp83640->hwts_rx_en)
+		return false;
+
+	if (is_status_frame(skb, type)) {
+		decode_status_frame(dp83640, skb);
+		/* Let the stack drop this frame. */
+		return false;
+	}
+
+	SKB_PTP_TYPE(skb) = type;
+	skb_queue_tail(&dp83640->rx_queue, skb);
+	schedule_work(&dp83640->ts_work);
+
+	return true;
+}
+
+static void dp83640_txtstamp(struct phy_device *phydev,
+			     struct sk_buff *skb, int type)
+{
+	struct dp83640_private *dp83640 = phydev->priv;
+
+	if (!dp83640->hwts_tx_en) {
+		kfree_skb(skb);
+		return;
+	}
+	skb_queue_tail(&dp83640->tx_queue, skb);
+	schedule_work(&dp83640->ts_work);
+}
+
+static struct phy_driver dp83640_driver = {
+	.phy_id		= DP83640_PHY_ID,
+	.phy_id_mask	= 0xfffffff0,
+	.name		= "NatSemi DP83640",
+	.features	= PHY_BASIC_FEATURES,
+	.flags		= 0,
+	.probe		= dp83640_probe,
+	.remove		= dp83640_remove,
+	.config_aneg	= genphy_config_aneg,
+	.read_status	= genphy_read_status,
+	.hwtstamp	= dp83640_hwtstamp,
+	.rxtstamp	= dp83640_rxtstamp,
+	.txtstamp	= dp83640_txtstamp,
+	.driver		= {.owner = THIS_MODULE,}
+};
+
+static int __init dp83640_init(void)
+{
+	return phy_driver_register(&dp83640_driver);
+}
+
+static void __exit dp83640_exit(void)
+{
+	dp83640_free_clocks();
+	phy_driver_unregister(&dp83640_driver);
+}
+
+MODULE_DESCRIPTION("National Semiconductor DP83640 PHY driver");
+MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>");
+MODULE_LICENSE("GPL");
+
+module_init(dp83640_init);
+module_exit(dp83640_exit);
+
+static struct mdio_device_id dp83640_tbl[] = {
+	{ DP83640_PHY_ID, 0xfffffff0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(mdio, dp83640_tbl);
diff --git a/drivers/net/phy/dp83640_reg.h b/drivers/net/phy/dp83640_reg.h
new file mode 100644
index 000000000000..e7fe41117003
--- /dev/null
+++ b/drivers/net/phy/dp83640_reg.h
@@ -0,0 +1,267 @@
+/* dp83640_reg.h
+ * Generated by regen.tcl on Thu Feb 17 10:02:48 AM CET 2011
+ */
+#ifndef HAVE_DP83640_REGISTERS
+#define HAVE_DP83640_REGISTERS
+
+#define PAGE0                     0x0000
+#define PHYCR2                    0x001c /* PHY Control Register 2 */
+
+#define PAGE4                     0x0004
+#define PTP_CTL                   0x0014 /* PTP Control Register */
+#define PTP_TDR                   0x0015 /* PTP Time Data Register */
+#define PTP_STS                   0x0016 /* PTP Status Register */
+#define PTP_TSTS                  0x0017 /* PTP Trigger Status Register */
+#define PTP_RATEL                 0x0018 /* PTP Rate Low Register */
+#define PTP_RATEH                 0x0019 /* PTP Rate High Register */
+#define PTP_RDCKSUM               0x001a /* PTP Read Checksum */
+#define PTP_WRCKSUM               0x001b /* PTP Write Checksum */
+#define PTP_TXTS                  0x001c /* PTP Transmit Timestamp Register, in four 16-bit reads */
+#define PTP_RXTS                  0x001d /* PTP Receive Timestamp Register, in six? 16-bit reads */
+#define PTP_ESTS                  0x001e /* PTP Event Status Register */
+#define PTP_EDATA                 0x001f /* PTP Event Data Register */
+
+#define PAGE5                     0x0005
+#define PTP_TRIG                  0x0014 /* PTP Trigger Configuration Register */
+#define PTP_EVNT                  0x0015 /* PTP Event Configuration Register */
+#define PTP_TXCFG0                0x0016 /* PTP Transmit Configuration Register 0 */
+#define PTP_TXCFG1                0x0017 /* PTP Transmit Configuration Register 1 */
+#define PSF_CFG0                  0x0018 /* PHY Status Frame Configuration Register 0 */
+#define PTP_RXCFG0                0x0019 /* PTP Receive Configuration Register 0 */
+#define PTP_RXCFG1                0x001a /* PTP Receive Configuration Register 1 */
+#define PTP_RXCFG2                0x001b /* PTP Receive Configuration Register 2 */
+#define PTP_RXCFG3                0x001c /* PTP Receive Configuration Register 3 */
+#define PTP_RXCFG4                0x001d /* PTP Receive Configuration Register 4 */
+#define PTP_TRDL                  0x001e /* PTP Temporary Rate Duration Low Register */
+#define PTP_TRDH                  0x001f /* PTP Temporary Rate Duration High Register */
+
+#define PAGE6                     0x0006
+#define PTP_COC                   0x0014 /* PTP Clock Output Control Register */
+#define PSF_CFG1                  0x0015 /* PHY Status Frame Configuration Register 1 */
+#define PSF_CFG2                  0x0016 /* PHY Status Frame Configuration Register 2 */
+#define PSF_CFG3                  0x0017 /* PHY Status Frame Configuration Register 3 */
+#define PSF_CFG4                  0x0018 /* PHY Status Frame Configuration Register 4 */
+#define PTP_SFDCFG                0x0019 /* PTP SFD Configuration Register */
+#define PTP_INTCTL                0x001a /* PTP Interrupt Control Register */
+#define PTP_CLKSRC                0x001b /* PTP Clock Source Register */
+#define PTP_ETR                   0x001c /* PTP Ethernet Type Register */
+#define PTP_OFF                   0x001d /* PTP Offset Register */
+#define PTP_GPIOMON               0x001e /* PTP GPIO Monitor Register */
+#define PTP_RXHASH                0x001f /* PTP Receive Hash Register */
+
+/* Bit definitions for the PHYCR2 register */
+#define BC_WRITE                  (1<<11) /* Broadcast Write Enable */
+
+/* Bit definitions for the PTP_CTL register */
+#define TRIG_SEL_SHIFT            (10)    /* PTP Trigger Select */
+#define TRIG_SEL_MASK             (0x7)
+#define TRIG_DIS                  (1<<9)  /* Disable PTP Trigger */
+#define TRIG_EN                   (1<<8)  /* Enable PTP Trigger */
+#define TRIG_READ                 (1<<7)  /* Read PTP Trigger */
+#define TRIG_LOAD                 (1<<6)  /* Load PTP Trigger */
+#define PTP_RD_CLK                (1<<5)  /* Read PTP Clock */
+#define PTP_LOAD_CLK              (1<<4)  /* Load PTP Clock */
+#define PTP_STEP_CLK              (1<<3)  /* Step PTP Clock */
+#define PTP_ENABLE                (1<<2)  /* Enable PTP Clock */
+#define PTP_DISABLE               (1<<1)  /* Disable PTP Clock */
+#define PTP_RESET                 (1<<0)  /* Reset PTP Clock */
+
+/* Bit definitions for the PTP_STS register */
+#define TXTS_RDY                  (1<<11) /* Transmit Timestamp Ready */
+#define RXTS_RDY                  (1<<10) /* Receive Timestamp Ready */
+#define TRIG_DONE                 (1<<9)  /* PTP Trigger Done */
+#define EVENT_RDY                 (1<<8)  /* PTP Event Timestamp Ready */
+#define TXTS_IE                   (1<<3)  /* Transmit Timestamp Interrupt Enable */
+#define RXTS_IE                   (1<<2)  /* Receive Timestamp Interrupt Enable */
+#define TRIG_IE                   (1<<1)  /* Trigger Interrupt Enable */
+#define EVENT_IE                  (1<<0)  /* Event Interrupt Enable */
+
+/* Bit definitions for the PTP_TSTS register */
+#define TRIG7_ERROR               (1<<15) /* Trigger 7 Error */
+#define TRIG7_ACTIVE              (1<<14) /* Trigger 7 Active */
+#define TRIG6_ERROR               (1<<13) /* Trigger 6 Error */
+#define TRIG6_ACTIVE              (1<<12) /* Trigger 6 Active */
+#define TRIG5_ERROR               (1<<11) /* Trigger 5 Error */
+#define TRIG5_ACTIVE              (1<<10) /* Trigger 5 Active */
+#define TRIG4_ERROR               (1<<9)  /* Trigger 4 Error */
+#define TRIG4_ACTIVE              (1<<8)  /* Trigger 4 Active */
+#define TRIG3_ERROR               (1<<7)  /* Trigger 3 Error */
+#define TRIG3_ACTIVE              (1<<6)  /* Trigger 3 Active */
+#define TRIG2_ERROR               (1<<5)  /* Trigger 2 Error */
+#define TRIG2_ACTIVE              (1<<4)  /* Trigger 2 Active */
+#define TRIG1_ERROR               (1<<3)  /* Trigger 1 Error */
+#define TRIG1_ACTIVE              (1<<2)  /* Trigger 1 Active */
+#define TRIG0_ERROR               (1<<1)  /* Trigger 0 Error */
+#define TRIG0_ACTIVE              (1<<0)  /* Trigger 0 Active */
+
+/* Bit definitions for the PTP_RATEH register */
+#define PTP_RATE_DIR              (1<<15) /* PTP Rate Direction */
+#define PTP_TMP_RATE              (1<<14) /* PTP Temporary Rate */
+#define PTP_RATE_HI_SHIFT         (0)     /* PTP Rate High 10-bits */
+#define PTP_RATE_HI_MASK          (0x3ff)
+
+/* Bit definitions for the PTP_ESTS register */
+#define EVNTS_MISSED_SHIFT        (8)     /* Indicates number of events missed */
+#define EVNTS_MISSED_MASK         (0x7)
+#define EVNT_TS_LEN_SHIFT         (6)     /* Indicates length of the Timestamp field in 16-bit words minus 1 */
+#define EVNT_TS_LEN_MASK          (0x3)
+#define EVNT_RF                   (1<<5)  /* Indicates whether the event is a rise or falling event */
+#define EVNT_NUM_SHIFT            (2)     /* Indicates Event Timestamp Unit which detected an event */
+#define EVNT_NUM_MASK             (0x7)
+#define MULT_EVNT                 (1<<1)  /* Indicates multiple events were detected at the same time */
+#define EVENT_DET                 (1<<0)  /* PTP Event Detected */
+
+/* Bit definitions for the PTP_EDATA register */
+#define E7_RISE                   (1<<15) /* Indicates direction of Event 7 */
+#define E7_DET                    (1<<14) /* Indicates Event 7 detected */
+#define E6_RISE                   (1<<13) /* Indicates direction of Event 6 */
+#define E6_DET                    (1<<12) /* Indicates Event 6 detected */
+#define E5_RISE                   (1<<11) /* Indicates direction of Event 5 */
+#define E5_DET                    (1<<10) /* Indicates Event 5 detected */
+#define E4_RISE                   (1<<9)  /* Indicates direction of Event 4 */
+#define E4_DET                    (1<<8)  /* Indicates Event 4 detected */
+#define E3_RISE                   (1<<7)  /* Indicates direction of Event 3 */
+#define E3_DET                    (1<<6)  /* Indicates Event 3 detected */
+#define E2_RISE                   (1<<5)  /* Indicates direction of Event 2 */
+#define E2_DET                    (1<<4)  /* Indicates Event 2 detected */
+#define E1_RISE                   (1<<3)  /* Indicates direction of Event 1 */
+#define E1_DET                    (1<<2)  /* Indicates Event 1 detected */
+#define E0_RISE                   (1<<1)  /* Indicates direction of Event 0 */
+#define E0_DET                    (1<<0)  /* Indicates Event 0 detected */
+
+/* Bit definitions for the PTP_TRIG register */
+#define TRIG_PULSE                (1<<15) /* generate a Pulse rather than a single edge */
+#define TRIG_PER                  (1<<14) /* generate a periodic signal */
+#define TRIG_IF_LATE              (1<<13) /* trigger immediately if already past */
+#define TRIG_NOTIFY               (1<<12) /* Trigger Notification Enable */
+#define TRIG_GPIO_SHIFT           (8)     /* Trigger GPIO Connection, value 1-12 */
+#define TRIG_GPIO_MASK            (0xf)
+#define TRIG_TOGGLE               (1<<7)  /* Trigger Toggle Mode Enable */
+#define TRIG_CSEL_SHIFT           (1)     /* Trigger Configuration Select */
+#define TRIG_CSEL_MASK            (0x7)
+#define TRIG_WR                   (1<<0)  /* Trigger Configuration Write */
+
+/* Bit definitions for the PTP_EVNT register */
+#define EVNT_RISE                 (1<<14) /* Event Rise Detect Enable */
+#define EVNT_FALL                 (1<<13) /* Event Fall Detect Enable */
+#define EVNT_SINGLE               (1<<12) /* enable single event capture operation */
+#define EVNT_GPIO_SHIFT           (8)     /* Event GPIO Connection, value 1-12 */
+#define EVNT_GPIO_MASK            (0xf)
+#define EVNT_SEL_SHIFT            (1)     /* Event Select */
+#define EVNT_SEL_MASK             (0x7)
+#define EVNT_WR                   (1<<0)  /* Event Configuration Write */
+
+/* Bit definitions for the PTP_TXCFG0 register */
+#define SYNC_1STEP                (1<<15) /* insert timestamp into transmit Sync Messages */
+#define DR_INSERT                 (1<<13) /* Insert Delay_Req Timestamp in Delay_Resp (dangerous) */
+#define NTP_TS_EN                 (1<<12) /* Enable Timestamping of NTP Packets */
+#define IGNORE_2STEP              (1<<11) /* Ignore Two_Step flag for One-Step operation */
+#define CRC_1STEP                 (1<<10) /* Disable checking of CRC for One-Step operation */
+#define CHK_1STEP                 (1<<9)  /* Enable UDP Checksum correction for One-Step Operation */
+#define IP1588_EN                 (1<<8)  /* Enable IEEE 1588 defined IP address filter */
+#define TX_L2_EN                  (1<<7)  /* Layer2 Timestamp Enable */
+#define TX_IPV6_EN                (1<<6)  /* IPv6 Timestamp Enable */
+#define TX_IPV4_EN                (1<<5)  /* IPv4 Timestamp Enable */
+#define TX_PTP_VER_SHIFT          (1)     /* Enable Timestamp capture for IEEE 1588 version X */
+#define TX_PTP_VER_MASK           (0xf)
+#define TX_TS_EN                  (1<<0)  /* Transmit Timestamp Enable */
+
+/* Bit definitions for the PTP_TXCFG1 register */
+#define BYTE0_MASK_SHIFT          (8)     /* Bit mask to be used for matching Byte0 of the PTP Message */
+#define BYTE0_MASK_MASK           (0xff)
+#define BYTE0_DATA_SHIFT          (0)     /* Data to be used for matching Byte0 of the PTP Message */
+#define BYTE0_DATA_MASK           (0xff)
+
+/* Bit definitions for the PSF_CFG0 register */
+#define MAC_SRC_ADD_SHIFT         (11)    /* Status Frame Mac Source Address */
+#define MAC_SRC_ADD_MASK          (0x3)
+#define MIN_PRE_SHIFT             (8)     /* Status Frame Minimum Preamble */
+#define MIN_PRE_MASK              (0x7)
+#define PSF_ENDIAN                (1<<7)  /* Status Frame Endian Control */
+#define PSF_IPV4                  (1<<6)  /* Status Frame IPv4 Enable */
+#define PSF_PCF_RD                (1<<5)  /* Control Frame Read PHY Status Frame Enable */
+#define PSF_ERR_EN                (1<<4)  /* Error PHY Status Frame Enable */
+#define PSF_TXTS_EN               (1<<3)  /* Transmit Timestamp PHY Status Frame Enable */
+#define PSF_RXTS_EN               (1<<2)  /* Receive Timestamp PHY Status Frame Enable */
+#define PSF_TRIG_EN               (1<<1)  /* Trigger PHY Status Frame Enable */
+#define PSF_EVNT_EN               (1<<0)  /* Event PHY Status Frame Enable */
+
+/* Bit definitions for the PTP_RXCFG0 register */
+#define DOMAIN_EN                 (1<<15) /* Domain Match Enable */
+#define ALT_MAST_DIS              (1<<14) /* Alternate Master Timestamp Disable */
+#define USER_IP_SEL               (1<<13) /* Selects portion of IP address accessible thru PTP_RXCFG2 */
+#define USER_IP_EN                (1<<12) /* Enable User-programmed IP address filter */
+#define RX_SLAVE                  (1<<11) /* Receive Slave Only */
+#define IP1588_EN_SHIFT           (8)     /* Enable IEEE 1588 defined IP address filters */
+#define IP1588_EN_MASK            (0xf)
+#define RX_L2_EN                  (1<<7)  /* Layer2 Timestamp Enable */
+#define RX_IPV6_EN                (1<<6)  /* IPv6 Timestamp Enable */
+#define RX_IPV4_EN                (1<<5)  /* IPv4 Timestamp Enable */
+#define RX_PTP_VER_SHIFT          (1)     /* Enable Timestamp capture for IEEE 1588 version X */
+#define RX_PTP_VER_MASK           (0xf)
+#define RX_TS_EN                  (1<<0)  /* Receive Timestamp Enable */
+
+/* Bit definitions for the PTP_RXCFG1 register */
+#define BYTE0_MASK_SHIFT          (8)     /* Bit mask to be used for matching Byte0 of the PTP Message */
+#define BYTE0_MASK_MASK           (0xff)
+#define BYTE0_DATA_SHIFT          (0)     /* Data to be used for matching Byte0 of the PTP Message */
+#define BYTE0_DATA_MASK           (0xff)
+
+/* Bit definitions for the PTP_RXCFG3 register */
+#define TS_MIN_IFG_SHIFT          (12)    /* Minimum Inter-frame Gap */
+#define TS_MIN_IFG_MASK           (0xf)
+#define ACC_UDP                   (1<<11) /* Record Timestamp if UDP Checksum Error */
+#define ACC_CRC                   (1<<10) /* Record Timestamp if CRC Error */
+#define TS_APPEND                 (1<<9)  /* Append Timestamp for L2 */
+#define TS_INSERT                 (1<<8)  /* Enable Timestamp Insertion */
+#define PTP_DOMAIN_SHIFT          (0)     /* PTP Message domainNumber field */
+#define PTP_DOMAIN_MASK           (0xff)
+
+/* Bit definitions for the PTP_RXCFG4 register */
+#define IPV4_UDP_MOD              (1<<15) /* Enable IPV4 UDP Modification */
+#define TS_SEC_EN                 (1<<14) /* Enable Timestamp Seconds */
+#define TS_SEC_LEN_SHIFT          (12)    /* Inserted Timestamp Seconds Length */
+#define TS_SEC_LEN_MASK           (0x3)
+#define RXTS_NS_OFF_SHIFT         (6)     /* Receive Timestamp Nanoseconds offset */
+#define RXTS_NS_OFF_MASK          (0x3f)
+#define RXTS_SEC_OFF_SHIFT        (0)     /* Receive Timestamp Seconds offset */
+#define RXTS_SEC_OFF_MASK         (0x3f)
+
+/* Bit definitions for the PTP_COC register */
+#define PTP_CLKOUT_EN             (1<<15) /* PTP Clock Output Enable */
+#define PTP_CLKOUT_SEL            (1<<14) /* PTP Clock Output Source Select */
+#define PTP_CLKOUT_SPEEDSEL       (1<<13) /* PTP Clock Output I/O Speed Select */
+#define PTP_CLKDIV_SHIFT          (0)     /* PTP Clock Divide-by Value */
+#define PTP_CLKDIV_MASK           (0xff)
+
+/* Bit definitions for the PSF_CFG1 register */
+#define PTPRESERVED_SHIFT         (12)    /* PTP v2 reserved field */
+#define PTPRESERVED_MASK          (0xf)
+#define VERSIONPTP_SHIFT          (8)     /* PTP v2 versionPTP field */
+#define VERSIONPTP_MASK           (0xf)
+#define TRANSPORT_SPECIFIC_SHIFT  (4)     /* PTP v2 Header transportSpecific field */
+#define TRANSPORT_SPECIFIC_MASK   (0xf)
+#define MESSAGETYPE_SHIFT         (0)     /* PTP v2 messageType field */
+#define MESSAGETYPE_MASK          (0xf)
+
+/* Bit definitions for the PTP_SFDCFG register */
+#define TX_SFD_GPIO_SHIFT         (4)     /* TX SFD GPIO Select, value 1-12 */
+#define TX_SFD_GPIO_MASK          (0xf)
+#define RX_SFD_GPIO_SHIFT         (0)     /* RX SFD GPIO Select, value 1-12 */
+#define RX_SFD_GPIO_MASK          (0xf)
+
+/* Bit definitions for the PTP_INTCTL register */
+#define PTP_INT_GPIO_SHIFT        (0)     /* PTP Interrupt GPIO Select */
+#define PTP_INT_GPIO_MASK         (0xf)
+
+/* Bit definitions for the PTP_CLKSRC register */
+#define CLK_SRC_SHIFT             (14)    /* PTP Clock Source Select */
+#define CLK_SRC_MASK              (0x3)
+#define CLK_SRC_PER_SHIFT         (0)     /* PTP Clock Source Period */
+#define CLK_SRC_PER_MASK          (0x7f)
+
+/* Bit definitions for the PTP_OFF register */
+#define PTP_OFFSET_SHIFT          (0)     /* PTP Message offset from preceding header */
+#define PTP_OFFSET_MASK           (0xff)
+
+#endif
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index fcfafd091fdd..68d720102296 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -53,4 +53,23 @@ config PTP_1588_CLOCK_IXP46X
 	  To compile this driver as a module, choose M here: the module
 	  will be called ptp_ixp46x.
 
+comment "Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks."
+	depends on PTP_1588_CLOCK && (PHYLIB=n || NETWORK_PHY_TIMESTAMPING=n)
+
+config DP83640_PHY
+	tristate "Driver for the National Semiconductor DP83640 PHYTER"
+	depends on PTP_1588_CLOCK
+	depends on NETWORK_PHY_TIMESTAMPING
+	depends on PHYLIB
+	---help---
+	  Supports the DP83640 PHYTER with IEEE 1588 features.
+
+	  This driver adds support for using the DP83640 as a PTP
+	  clock. This clock is only useful if your PTP programs are
+	  getting hardware time stamps on the PTP Ethernet packets
+	  using the SO_TIMESTAMPING API.
+
+	  In order for this to work, your MAC driver must also
+	  implement the skb_tx_timetamp() function.
+
 endmenu