ptp: Added a clock that uses the eTSEC found on the MPC85xx.

The eTSEC includes a PTP clock with quite a few features. This patch adds
support for the basic clock adjustment functions, plus two external time
stamps, one alarm, and the PPS callback.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

3 files changed, 602 insertions, 0 deletions

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 209fbb70619b..776a478e6296 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_ATL2) += atlx/
 obj-$(CONFIG_ATL1E) += atl1e/
 obj-$(CONFIG_ATL1C) += atl1c/
 obj-$(CONFIG_GIANFAR) += gianfar_driver.o
+obj-$(CONFIG_PTP_1588_CLOCK_GIANFAR) += gianfar_ptp.o
 obj-$(CONFIG_TEHUTI) += tehuti.o
 obj-$(CONFIG_ENIC) += enic/
 obj-$(CONFIG_JME) += jme.o
diff --git a/drivers/net/gianfar_ptp.c b/drivers/net/gianfar_ptp.c
new file mode 100644
index 000000000000..d8e175382d1d
--- /dev/null
+++ b/drivers/net/gianfar_ptp.c
@@ -0,0 +1,588 @@
+/*
+ * PTP 1588 clock using the eTSEC
+ *
+ * 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/device.h>
+#include <linux/hrtimer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/timex.h>
+#include <linux/io.h>
+
+#include <linux/ptp_clock_kernel.h>
+
+#include "gianfar.h"
+
+/*
+ * gianfar ptp registers
+ * Generated by regen.tcl on Thu May 13 01:38:57 PM CEST 2010
+ */
+struct gianfar_ptp_registers {
+        u32 tmr_ctrl;     /* Timer control register */
+        u32 tmr_tevent;   /* Timestamp event register */
+        u32 tmr_temask;   /* Timer event mask register */
+        u32 tmr_pevent;   /* Timestamp event register */
+        u32 tmr_pemask;   /* Timer event mask register */
+        u32 tmr_stat;     /* Timestamp status register */
+        u32 tmr_cnt_h;    /* Timer counter high register */
+        u32 tmr_cnt_l;    /* Timer counter low register */
+        u32 tmr_add;      /* Timer drift compensation addend register */
+        u32 tmr_acc;      /* Timer accumulator register */
+        u32 tmr_prsc;     /* Timer prescale */
+        u8  res1[4];
+        u32 tmroff_h;     /* Timer offset high */
+        u32 tmroff_l;     /* Timer offset low */
+        u8  res2[8];
+        u32 tmr_alarm1_h; /* Timer alarm 1 high register */
+        u32 tmr_alarm1_l; /* Timer alarm 1 high register */
+        u32 tmr_alarm2_h; /* Timer alarm 2 high register */
+        u32 tmr_alarm2_l; /* Timer alarm 2 high register */
+        u8  res3[48];
+        u32 tmr_fiper1;   /* Timer fixed period interval */
+        u32 tmr_fiper2;   /* Timer fixed period interval */
+        u32 tmr_fiper3;   /* Timer fixed period interval */
+        u8  res4[20];
+        u32 tmr_etts1_h;  /* Timestamp of general purpose external trigger */
+        u32 tmr_etts1_l;  /* Timestamp of general purpose external trigger */
+        u32 tmr_etts2_h;  /* Timestamp of general purpose external trigger */
+        u32 tmr_etts2_l;  /* Timestamp of general purpose external trigger */
+};
+
+/* Bit definitions for the TMR_CTRL register */
+#define ALM1P                 (1<<31) /* Alarm1 output polarity */
+#define ALM2P                 (1<<30) /* Alarm2 output polarity */
+#define FS                    (1<<28) /* FIPER start indication */
+#define PP1L                  (1<<27) /* Fiper1 pulse loopback mode enabled. */
+#define PP2L                  (1<<26) /* Fiper2 pulse loopback mode enabled. */
+#define TCLK_PERIOD_SHIFT     (16) /* 1588 timer reference clock period. */
+#define TCLK_PERIOD_MASK      (0x3ff)
+#define RTPE                  (1<<15) /* Record Tx Timestamp to PAL Enable. */
+#define FRD                   (1<<14) /* FIPER Realignment Disable */
+#define ESFDP                 (1<<11) /* External Tx/Rx SFD Polarity. */
+#define ESFDE                 (1<<10) /* External Tx/Rx SFD Enable. */
+#define ETEP2                 (1<<9) /* External trigger 2 edge polarity */
+#define ETEP1                 (1<<8) /* External trigger 1 edge polarity */
+#define COPH                  (1<<7) /* Generated clock output phase. */
+#define CIPH                  (1<<6) /* External oscillator input clock phase */
+#define TMSR                  (1<<5) /* Timer soft reset. */
+#define BYP                   (1<<3) /* Bypass drift compensated clock */
+#define TE                    (1<<2) /* 1588 timer enable. */
+#define CKSEL_SHIFT           (0)    /* 1588 Timer reference clock source */
+#define CKSEL_MASK            (0x3)
+
+/* Bit definitions for the TMR_TEVENT register */
+#define ETS2                  (1<<25) /* External trigger 2 timestamp sampled */
+#define ETS1                  (1<<24) /* External trigger 1 timestamp sampled */
+#define ALM2                  (1<<17) /* Current time = alarm time register 2 */
+#define ALM1                  (1<<16) /* Current time = alarm time register 1 */
+#define PP1                   (1<<7)  /* periodic pulse generated on FIPER1 */
+#define PP2                   (1<<6)  /* periodic pulse generated on FIPER2 */
+#define PP3                   (1<<5)  /* periodic pulse generated on FIPER3 */
+
+/* Bit definitions for the TMR_TEMASK register */
+#define ETS2EN                (1<<25) /* External trigger 2 timestamp enable */
+#define ETS1EN                (1<<24) /* External trigger 1 timestamp enable */
+#define ALM2EN                (1<<17) /* Timer ALM2 event enable */
+#define ALM1EN                (1<<16) /* Timer ALM1 event enable */
+#define PP1EN                 (1<<7) /* Periodic pulse event 1 enable */
+#define PP2EN                 (1<<6) /* Periodic pulse event 2 enable */
+
+/* Bit definitions for the TMR_PEVENT register */
+#define TXP2                  (1<<9) /* PTP transmitted timestamp im TXTS2 */
+#define TXP1                  (1<<8) /* PTP transmitted timestamp in TXTS1 */
+#define RXP                   (1<<0) /* PTP frame has been received */
+
+/* Bit definitions for the TMR_PEMASK register */
+#define TXP2EN                (1<<9) /* Transmit PTP packet event 2 enable */
+#define TXP1EN                (1<<8) /* Transmit PTP packet event 1 enable */
+#define RXPEN                 (1<<0) /* Receive PTP packet event enable */
+
+/* Bit definitions for the TMR_STAT register */
+#define STAT_VEC_SHIFT        (0) /* Timer general purpose status vector */
+#define STAT_VEC_MASK         (0x3f)
+
+/* Bit definitions for the TMR_PRSC register */
+#define PRSC_OCK_SHIFT        (0) /* Output clock division/prescale factor. */
+#define PRSC_OCK_MASK         (0xffff)
+
+
+#define DRIVER          "gianfar_ptp"
+#define DEFAULT_CKSEL   1
+#define N_ALARM         1 /* first alarm is used internally to reset fipers */
+#define N_EXT_TS        2
+#define REG_SIZE        sizeof(struct gianfar_ptp_registers)
+
+struct etsects {
+        struct gianfar_ptp_registers *regs;
+        spinlock_t lock; /* protects regs */
+        struct ptp_clock *clock;
+        struct ptp_clock_info caps;
+        struct resource *rsrc;
+        int irq;
+        u64 alarm_interval; /* for periodic alarm */
+        u64 alarm_value;
+        u32 tclk_period;  /* nanoseconds */
+        u32 tmr_prsc;
+        u32 tmr_add;
+        u32 cksel;
+        u32 tmr_fiper1;
+        u32 tmr_fiper2;
+};
+
+/*
+ * Register access functions
+ */
+
+/* Caller must hold etsects->lock. */
+static u64 tmr_cnt_read(struct etsects *etsects)
+{
+        u64 ns;
+        u32 lo, hi;
+
+        lo = gfar_read(&etsects->regs->tmr_cnt_l);
+        hi = gfar_read(&etsects->regs->tmr_cnt_h);
+        ns = ((u64) hi) << 32;
+        ns |= lo;
+        return ns;
+}
+
+/* Caller must hold etsects->lock. */
+static void tmr_cnt_write(struct etsects *etsects, u64 ns)
+{
+        u32 hi = ns >> 32;
+        u32 lo = ns & 0xffffffff;
+
+        gfar_write(&etsects->regs->tmr_cnt_l, lo);
+        gfar_write(&etsects->regs->tmr_cnt_h, hi);
+}
+
+/* Caller must hold etsects->lock. */
+static void set_alarm(struct etsects *etsects)
+{
+        u64 ns;
+        u32 lo, hi;
+
+        ns = tmr_cnt_read(etsects) + 1500000000ULL;
+        ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
+        ns -= etsects->tclk_period;
+        hi = ns >> 32;
+        lo = ns & 0xffffffff;
+        gfar_write(&etsects->regs->tmr_alarm1_l, lo);
+        gfar_write(&etsects->regs->tmr_alarm1_h, hi);
+}
+
+/* Caller must hold etsects->lock. */
+static void set_fipers(struct etsects *etsects)
+{
+        u32 tmr_ctrl = gfar_read(&etsects->regs->tmr_ctrl);
+
+        gfar_write(&etsects->regs->tmr_ctrl,   tmr_ctrl & (~TE));
+        gfar_write(&etsects->regs->tmr_prsc,   etsects->tmr_prsc);
+        gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
+        gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
+        set_alarm(etsects);
+        gfar_write(&etsects->regs->tmr_ctrl,   tmr_ctrl|TE);
+}
+
+/*
+ * Interrupt service routine
+ */
+
+static irqreturn_t isr(int irq, void *priv)
+{
+        struct etsects *etsects = priv;
+        struct ptp_clock_event event;
+        u64 ns;
+        u32 ack = 0, lo, hi, mask, val;
+
+        val = gfar_read(&etsects->regs->tmr_tevent);
+
+        if (val & ETS1) {
+                ack |= ETS1;
+                hi = gfar_read(&etsects->regs->tmr_etts1_h);
+                lo = gfar_read(&etsects->regs->tmr_etts1_l);
+                event.type = PTP_CLOCK_EXTTS;
+                event.index = 0;
+                event.timestamp = ((u64) hi) << 32;
+                event.timestamp |= lo;
+                ptp_clock_event(etsects->clock, &event);
+        }
+
+        if (val & ETS2) {
+                ack |= ETS2;
+                hi = gfar_read(&etsects->regs->tmr_etts2_h);
+                lo = gfar_read(&etsects->regs->tmr_etts2_l);
+                event.type = PTP_CLOCK_EXTTS;
+                event.index = 1;
+                event.timestamp = ((u64) hi) << 32;
+                event.timestamp |= lo;
+                ptp_clock_event(etsects->clock, &event);
+        }
+
+        if (val & ALM2) {
+                ack |= ALM2;
+                if (etsects->alarm_value) {
+                        event.type = PTP_CLOCK_ALARM;
+                        event.index = 0;
+                        event.timestamp = etsects->alarm_value;
+                        ptp_clock_event(etsects->clock, &event);
+                }
+                if (etsects->alarm_interval) {
+                        ns = etsects->alarm_value + etsects->alarm_interval;
+                        hi = ns >> 32;
+                        lo = ns & 0xffffffff;
+                        spin_lock(&etsects->lock);
+                        gfar_write(&etsects->regs->tmr_alarm2_l, lo);
+                        gfar_write(&etsects->regs->tmr_alarm2_h, hi);
+                        spin_unlock(&etsects->lock);
+                        etsects->alarm_value = ns;
+                } else {
+                        gfar_write(&etsects->regs->tmr_tevent, ALM2);
+                        spin_lock(&etsects->lock);
+                        mask = gfar_read(&etsects->regs->tmr_temask);
+                        mask &= ~ALM2EN;
+                        gfar_write(&etsects->regs->tmr_temask, mask);
+                        spin_unlock(&etsects->lock);
+                        etsects->alarm_value = 0;
+                        etsects->alarm_interval = 0;
+                }
+        }
+
+        if (val & PP1) {
+                ack |= PP1;
+                event.type = PTP_CLOCK_PPS;
+                ptp_clock_event(etsects->clock, &event);
+        }
+
+        if (ack) {
+                gfar_write(&etsects->regs->tmr_tevent, ack);
+                return IRQ_HANDLED;
+        } else
+                return IRQ_NONE;
+}
+
+/*
+ * PTP clock operations
+ */
+
+static int ptp_gianfar_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+        u64 adj;
+        u32 diff, tmr_add;
+        int neg_adj = 0;
+        struct etsects *etsects = container_of(ptp, struct etsects, caps);
+
+        if (ppb < 0) {
+                neg_adj = 1;
+                ppb = -ppb;
+        }
+        tmr_add = etsects->tmr_add;
+        adj = tmr_add;
+        adj *= ppb;
+        diff = div_u64(adj, 1000000000ULL);
+
+        tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
+
+        gfar_write(&etsects->regs->tmr_add, tmr_add);
+
+        return 0;
+}
+
+static int ptp_gianfar_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+        s64 now;
+        unsigned long flags;
+        struct etsects *etsects = container_of(ptp, struct etsects, caps);
+
+        spin_lock_irqsave(&etsects->lock, flags);
+
+        now = tmr_cnt_read(etsects);
+        now += delta;
+        tmr_cnt_write(etsects, now);
+
+        spin_unlock_irqrestore(&etsects->lock, flags);
+
+        set_fipers(etsects);
+
+        return 0;
+}
+
+static int ptp_gianfar_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+        u64 ns;
+        u32 remainder;
+        unsigned long flags;
+        struct etsects *etsects = container_of(ptp, struct etsects, caps);
+
+        spin_lock_irqsave(&etsects->lock, flags);
+
+        ns = tmr_cnt_read(etsects);
+
+        spin_unlock_irqrestore(&etsects->lock, flags);
+
+        ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
+        ts->tv_nsec = remainder;
+        return 0;
+}
+
+static int ptp_gianfar_settime(struct ptp_clock_info *ptp,
+                               const struct timespec *ts)
+{
+        u64 ns;
+        unsigned long flags;
+        struct etsects *etsects = container_of(ptp, struct etsects, caps);
+
+        ns = ts->tv_sec * 1000000000ULL;
+        ns += ts->tv_nsec;
+
+        spin_lock_irqsave(&etsects->lock, flags);
+
+        tmr_cnt_write(etsects, ns);
+        set_fipers(etsects);
+
+        spin_unlock_irqrestore(&etsects->lock, flags);
+
+        return 0;
+}
+
+static int ptp_gianfar_enable(struct ptp_clock_info *ptp,
+                              struct ptp_clock_request *rq, int on)
+{
+        struct etsects *etsects = container_of(ptp, struct etsects, caps);
+        unsigned long flags;
+        u32 bit, mask;
+
+        switch (rq->type) {
+        case PTP_CLK_REQ_EXTTS:
+                switch (rq->extts.index) {
+                case 0:
+                        bit = ETS1EN;
+                        break;
+                case 1:
+                        bit = ETS2EN;
+                        break;
+                default:
+                        return -EINVAL;
+                }
+                spin_lock_irqsave(&etsects->lock, flags);
+                mask = gfar_read(&etsects->regs->tmr_temask);
+                if (on)
+                        mask |= bit;
+                else
+                        mask &= ~bit;
+                gfar_write(&etsects->regs->tmr_temask, mask);
+                spin_unlock_irqrestore(&etsects->lock, flags);
+                return 0;
+
+        case PTP_CLK_REQ_PPS:
+                spin_lock_irqsave(&etsects->lock, flags);
+                mask = gfar_read(&etsects->regs->tmr_temask);
+                if (on)
+                        mask |= PP1EN;
+                else
+                        mask &= ~PP1EN;
+                gfar_write(&etsects->regs->tmr_temask, mask);
+                spin_unlock_irqrestore(&etsects->lock, flags);
+                return 0;
+
+        default:
+                break;
+        }
+
+        return -EOPNOTSUPP;
+}
+
+static struct ptp_clock_info ptp_gianfar_caps = {
+        .owner          = THIS_MODULE,
+        .name           = "gianfar clock",
+        .max_adj        = 512000,
+        .n_alarm        = N_ALARM,
+        .n_ext_ts       = N_EXT_TS,
+        .n_per_out      = 0,
+        .pps            = 1,
+        .adjfreq        = ptp_gianfar_adjfreq,
+        .adjtime        = ptp_gianfar_adjtime,
+        .gettime        = ptp_gianfar_gettime,
+        .settime        = ptp_gianfar_settime,
+        .enable         = ptp_gianfar_enable,
+};
+
+/* OF device tree */
+
+static int get_of_u32(struct device_node *node, char *str, u32 *val)
+{
+        int plen;
+        const u32 *prop = of_get_property(node, str, &plen);
+
+        if (!prop || plen != sizeof(*prop))
+                return -1;
+        *val = *prop;
+        return 0;
+}
+
+static int gianfar_ptp_probe(struct platform_device *dev)
+{
+        struct device_node *node = dev->dev.of_node;
+        struct etsects *etsects;
+        struct timespec now;
+        int err = -ENOMEM;
+        u32 tmr_ctrl;
+        unsigned long flags;
+
+        etsects = kzalloc(sizeof(*etsects), GFP_KERNEL);
+        if (!etsects)
+                goto no_memory;
+
+        err = -ENODEV;
+
+        etsects->caps = ptp_gianfar_caps;
+        etsects->cksel = DEFAULT_CKSEL;
+
+        if (get_of_u32(node, "fsl,tclk-period", &etsects->tclk_period) ||
+            get_of_u32(node, "fsl,tmr-prsc", &etsects->tmr_prsc) ||
+            get_of_u32(node, "fsl,tmr-add", &etsects->tmr_add) ||
+            get_of_u32(node, "fsl,tmr-fiper1", &etsects->tmr_fiper1) ||
+            get_of_u32(node, "fsl,tmr-fiper2", &etsects->tmr_fiper2) ||
+            get_of_u32(node, "fsl,max-adj", &etsects->caps.max_adj)) {
+                pr_err("device tree node missing required elements\n");
+                goto no_node;
+        }
+
+        etsects->irq = platform_get_irq(dev, 0);
+
+        if (etsects->irq == NO_IRQ) {
+                pr_err("irq not in device tree\n");
+                goto no_node;
+        }
+        if (request_irq(etsects->irq, isr, 0, DRIVER, etsects)) {
+                pr_err("request_irq failed\n");
+                goto no_node;
+        }
+
+        etsects->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (!etsects->rsrc) {
+                pr_err("no resource\n");
+                goto no_resource;
+        }
+        if (request_resource(&ioport_resource, etsects->rsrc)) {
+                pr_err("resource busy\n");
+                goto no_resource;
+        }
+
+        spin_lock_init(&etsects->lock);
+
+        etsects->regs = ioremap(etsects->rsrc->start,
+                                1 + etsects->rsrc->end - etsects->rsrc->start);
+        if (!etsects->regs) {
+                pr_err("ioremap ptp registers failed\n");
+                goto no_ioremap;
+        }
+        getnstimeofday(&now);
+        ptp_gianfar_settime(&etsects->caps, &now);
+
+        tmr_ctrl =
+          (etsects->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
+          (etsects->cksel & CKSEL_MASK) << CKSEL_SHIFT;
+
+        spin_lock_irqsave(&etsects->lock, flags);
+
+        gfar_write(&etsects->regs->tmr_ctrl,   tmr_ctrl);
+        gfar_write(&etsects->regs->tmr_add,    etsects->tmr_add);
+        gfar_write(&etsects->regs->tmr_prsc,   etsects->tmr_prsc);
+        gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
+        gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
+        set_alarm(etsects);
+        gfar_write(&etsects->regs->tmr_ctrl,   tmr_ctrl|FS|RTPE|TE);
+
+        spin_unlock_irqrestore(&etsects->lock, flags);
+
+        etsects->clock = ptp_clock_register(&etsects->caps);
+        if (IS_ERR(etsects->clock)) {
+                err = PTR_ERR(etsects->clock);
+                goto no_clock;
+        }
+
+        dev_set_drvdata(&dev->dev, etsects);
+
+        return 0;
+
+no_clock:
+no_ioremap:
+        release_resource(etsects->rsrc);
+no_resource:
+        free_irq(etsects->irq, etsects);
+no_node:
+        kfree(etsects);
+no_memory:
+        return err;
+}
+
+static int gianfar_ptp_remove(struct platform_device *dev)
+{
+        struct etsects *etsects = dev_get_drvdata(&dev->dev);
+
+        gfar_write(&etsects->regs->tmr_temask, 0);
+        gfar_write(&etsects->regs->tmr_ctrl,   0);
+
+        ptp_clock_unregister(etsects->clock);
+        iounmap(etsects->regs);
+        release_resource(etsects->rsrc);
+        free_irq(etsects->irq, etsects);
+        kfree(etsects);
+
+        return 0;
+}
+
+static struct of_device_id match_table[] = {
+        { .compatible = "fsl,etsec-ptp" },
+        {},
+};
+
+static struct platform_driver gianfar_ptp_driver = {
+        .driver = {
+                .name           = "gianfar_ptp",
+                .of_match_table = match_table,
+                .owner          = THIS_MODULE,
+        },
+        .probe       = gianfar_ptp_probe,
+        .remove      = gianfar_ptp_remove,
+};
+
+/* module operations */
+
+static int __init ptp_gianfar_init(void)
+{
+        return platform_driver_register(&gianfar_ptp_driver);
+}
+
+module_init(ptp_gianfar_init);
+
+static void __exit ptp_gianfar_exit(void)
+{
+        platform_driver_unregister(&gianfar_ptp_driver);
+}
+
+module_exit(ptp_gianfar_exit);
+
+MODULE_AUTHOR("Richard Cochran <richard.cochran@omicron.at>");
+MODULE_DESCRIPTION("PTP clock using the eTSEC");
+MODULE_LICENSE("GPL");
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index 70d4bb1cbdab..12eb8447c26b 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -27,4 +27,17 @@ config PTP_1588_CLOCK
           To compile this driver as a module, choose M here: the module
           will be called ptp.
 
+config PTP_1588_CLOCK_GIANFAR
+        tristate "Freescale eTSEC as PTP clock"
+        depends on PTP_1588_CLOCK
+        depends on GIANFAR
+        help
+          This driver adds support for using the eTSEC 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.
+
+          To compile this driver as a module, choose M here: the module
+          will be called gianfar_ptp.
+
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