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    Subject[PATCH V10 13/15] 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>
    ---
    Documentation/powerpc/dts-bindings/fsl/tsec.txt | 57 +++
    arch/powerpc/boot/dts/mpc8313erdb.dts | 14 +
    arch/powerpc/boot/dts/mpc8572ds.dts | 14 +
    arch/powerpc/boot/dts/p2020ds.dts | 14 +
    arch/powerpc/boot/dts/p2020rdb.dts | 14 +
    drivers/net/Makefile | 1 +
    drivers/net/gianfar_ptp.c | 448 +++++++++++++++++++++++
    drivers/net/gianfar_ptp_reg.h | 113 ++++++
    drivers/ptp/Kconfig | 13 +
    9 files changed, 688 insertions(+), 0 deletions(-)
    create mode 100644 drivers/net/gianfar_ptp.c
    create mode 100644 drivers/net/gianfar_ptp_reg.h

    diff --git a/Documentation/powerpc/dts-bindings/fsl/tsec.txt b/Documentation/powerpc/dts-bindings/fsl/tsec.txt
    index edb7ae1..f6edbb8 100644
    --- a/Documentation/powerpc/dts-bindings/fsl/tsec.txt
    +++ b/Documentation/powerpc/dts-bindings/fsl/tsec.txt
    @@ -74,3 +74,60 @@ Example:
    interrupt-parent = <&mpic>;
    phy-handle = <&phy0>
    };
    +
    +* Gianfar PTP clock nodes
    +
    +General Properties:
    +
    + - compatible Should be "fsl,etsec-ptp"
    + - reg Offset and length of the register set for the device
    + - interrupts There should be at least two interrupts. Some devices
    + have as many as four PTP related interrupts.
    +
    +Clock Properties:
    +
    + - tclk-period Timer reference clock period in nanoseconds.
    + - tmr-prsc Prescaler, divides the output clock.
    + - tmr-add Frequency compensation value.
    + - cksel 0= external clock, 1= eTSEC system clock, 3= RTC clock input.
    + Currently the driver only supports choice "1".
    + - tmr-fiper1 Fixed interval period pulse generator.
    + - tmr-fiper2 Fixed interval period pulse generator.
    + - max-adj Maximum frequency adjustment in parts per billion.
    +
    + These properties set the operational parameters for the PTP
    + clock. You must choose these carefully for the clock to work right.
    + Here is how to figure good values:
    +
    + TimerOsc = system clock MHz
    + tclk_period = desired clock period nanoseconds
    + NominalFreq = 1000 / tclk_period MHz
    + FreqDivRatio = TimerOsc / NominalFreq (must be greater that 1.0)
    + tmr_add = ceil(2^32 / FreqDivRatio)
    + OutputClock = NominalFreq / tmr_prsc MHz
    + PulseWidth = 1 / OutputClock microseconds
    + FiperFreq1 = desired frequency in Hz
    + FiperDiv1 = 1000000 * OutputClock / FiperFreq1
    + tmr_fiper1 = tmr_prsc * tclk_period * FiperDiv1 - tclk_period
    + max_adj = 1000000000 * (FreqDivRatio - 1.0) - 1
    +
    + The calculation for tmr_fiper2 is the same as for tmr_fiper1. The
    + driver expects that tmr_fiper1 will be correctly set to produce a 1
    + Pulse Per Second (PPS) signal, since this will be offered to the PPS
    + subsystem to synchronize the Linux clock.
    +
    +Example:
    +
    + ptp_clock@24E00 {
    + compatible = "fsl,etsec-ptp";
    + reg = <0x24E00 0xB0>;
    + interrupts = <12 0x8 13 0x8>;
    + interrupt-parent = < &ipic >;
    + tclk-period = <10>;
    + tmr-prsc = <100>;
    + tmr-add = <0x999999A4>;
    + cksel = <0x1>;
    + tmr-fiper1 = <0x3B9AC9F6>;
    + tmr-fiper2 = <0x00018696>;
    + max-adj = <659999998>;
    + };
    diff --git a/arch/powerpc/boot/dts/mpc8313erdb.dts b/arch/powerpc/boot/dts/mpc8313erdb.dts
    index 183f2aa..85a7eaa 100644
    --- a/arch/powerpc/boot/dts/mpc8313erdb.dts
    +++ b/arch/powerpc/boot/dts/mpc8313erdb.dts
    @@ -208,6 +208,20 @@
    sleep = <&pmc 0x00300000>;
    };

    + ptp_clock@24E00 {
    + compatible = "fsl,etsec-ptp";
    + reg = <0x24E00 0xB0>;
    + interrupts = <12 0x8 13 0x8>;
    + interrupt-parent = < &ipic >;
    + tclk-period = <10>;
    + tmr-prsc = <100>;
    + tmr-add = <0x999999A4>;
    + cksel = <0x1>;
    + tmr-fiper1 = <0x3B9AC9F6>;
    + tmr-fiper2 = <0x00018696>;
    + max-adj = <659999998>;
    + };
    +
    enet0: ethernet@24000 {
    #address-cells = <1>;
    #size-cells = <1>;
    diff --git a/arch/powerpc/boot/dts/mpc8572ds.dts b/arch/powerpc/boot/dts/mpc8572ds.dts
    index cafc128..74208cd 100644
    --- a/arch/powerpc/boot/dts/mpc8572ds.dts
    +++ b/arch/powerpc/boot/dts/mpc8572ds.dts
    @@ -324,6 +324,20 @@
    };
    };

    + ptp_clock@24E00 {
    + compatible = "fsl,etsec-ptp";
    + reg = <0x24E00 0xB0>;
    + interrupts = <68 2 69 2 70 2 71 2>;
    + interrupt-parent = < &mpic >;
    + tclk-period = <5>;
    + tmr-prsc = <200>;
    + tmr-add = <0xAAAAAAAB>;
    + cksel = <1>;
    + tmr-fiper1 = <0x3B9AC9FB>;
    + tmr-fiper2 = <0x3B9AC9FB>;
    + max-adj = <499999999>;
    + };
    +
    enet0: ethernet@24000 {
    #address-cells = <1>;
    #size-cells = <1>;
    diff --git a/arch/powerpc/boot/dts/p2020ds.dts b/arch/powerpc/boot/dts/p2020ds.dts
    index 1101914..39d73bb 100644
    --- a/arch/powerpc/boot/dts/p2020ds.dts
    +++ b/arch/powerpc/boot/dts/p2020ds.dts
    @@ -336,6 +336,20 @@
    phy_type = "ulpi";
    };

    + ptp_clock@24E00 {
    + compatible = "fsl,etsec-ptp";
    + reg = <0x24E00 0xB0>;
    + interrupts = <68 2 69 2 70 2>;
    + interrupt-parent = < &mpic >;
    + tclk-period = <5>;
    + tmr-prsc = <200>;
    + tmr-add = <0xCCCCCCCD>;
    + cksel = <1>;
    + tmr-fiper1 = <0x3B9AC9FB>;
    + tmr-fiper2 = <0x0001869B>;
    + max-adj = <249999999>;
    + };
    +
    enet0: ethernet@24000 {
    #address-cells = <1>;
    #size-cells = <1>;
    diff --git a/arch/powerpc/boot/dts/p2020rdb.dts b/arch/powerpc/boot/dts/p2020rdb.dts
    index da4cb0d..5498fb9 100644
    --- a/arch/powerpc/boot/dts/p2020rdb.dts
    +++ b/arch/powerpc/boot/dts/p2020rdb.dts
    @@ -396,6 +396,20 @@
    phy_type = "ulpi";
    };

    + ptp_clock@24E00 {
    + compatible = "fsl,etsec-ptp";
    + reg = <0x24E00 0xB0>;
    + interrupts = <68 2 69 2 70 2>;
    + interrupt-parent = < &mpic >;
    + tclk-period = <5>;
    + tmr-prsc = <200>;
    + tmr-add = <0xCCCCCCCD>;
    + cksel = <1>;
    + tmr-fiper1 = <0x3B9AC9FB>;
    + tmr-fiper2 = <0x0001869B>;
    + max-adj = <249999999>;
    + };
    +
    enet0: ethernet@24000 {
    #address-cells = <1>;
    #size-cells = <1>;
    diff --git a/drivers/net/Makefile b/drivers/net/Makefile
    index b90738d..c303f5f 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 0000000..84fff15
    --- /dev/null
    +++ b/drivers/net/gianfar_ptp.c
    @@ -0,0 +1,448 @@
    +/*
    + * 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_ptp_reg.h"
    +#include "gianfar.h"
    +
    +#define DRIVER "gianfar_ptp"
    +#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;
    + struct ptp_clock *clock;
    + struct ptp_clock_info caps;
    + 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;
    +};
    +
    +/* Private globals */
    +static struct etsects the_clock;
    +DEFINE_SPINLOCK(register_lock);
    +
    +/*
    + * Register access functions
    + */
    +
    +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;
    +}
    +
    +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);
    +}
    +
    +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);
    +}
    +
    +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(&register_lock);
    + gfar_write(&etsects->regs->tmr_alarm2_l, lo);
    + gfar_write(&etsects->regs->tmr_alarm2_h, hi);
    + spin_unlock(&register_lock);
    + etsects->alarm_value = ns;
    + } else {
    + gfar_write(&etsects->regs->tmr_tevent, ALM2);
    + spin_lock(&register_lock);
    + mask = gfar_read(&etsects->regs->tmr_temask);
    + mask &= ~ALM2EN;
    + gfar_write(&etsects->regs->tmr_temask, mask);
    + spin_unlock(&register_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(&register_lock, flags);
    +
    + now = tmr_cnt_read(etsects);
    + now += delta;
    + tmr_cnt_write(etsects, now);
    +
    + spin_unlock_irqrestore(&register_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(&register_lock, flags);
    +
    + ns = tmr_cnt_read(etsects);
    +
    + spin_unlock_irqrestore(&register_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(&register_lock, flags);
    +
    + tmr_cnt_write(etsects, ns);
    + set_fipers(etsects);
    +
    + spin_unlock_irqrestore(&register_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(&register_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(&register_lock, flags);
    + return 0;
    +
    + case PTP_CLK_REQ_PPS:
    + spin_lock_irqsave(&register_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(&register_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,
    + const struct of_device_id *match)
    +{
    + struct device_node *node = dev->dev.of_node;
    + struct etsects *etsects = &the_clock;
    + struct timespec now;
    + u32 tmr_ctrl;
    +
    + etsects->caps = ptp_gianfar_caps;
    +
    + if (get_of_u32(node, "tclk-period", &etsects->tclk_period) ||
    + get_of_u32(node, "tmr-prsc", &etsects->tmr_prsc) ||
    + get_of_u32(node, "tmr-add", &etsects->tmr_add) ||
    + get_of_u32(node, "cksel", &etsects->cksel) ||
    + get_of_u32(node, "tmr-fiper1", &etsects->tmr_fiper1) ||
    + get_of_u32(node, "tmr-fiper2", &etsects->tmr_fiper2) ||
    + get_of_u32(node, "max-adj", &etsects->caps.max_adj)) {
    + pr_err("device tree node missing required elements\n");
    + return -ENODEV;
    + }
    +
    + etsects->irq = irq_of_parse_and_map(node, 0);
    +
    + if (etsects->irq == NO_IRQ) {
    + pr_err("irq not in device tree\n");
    + return -ENODEV;
    + }
    + if (request_irq(etsects->irq, isr, 0, DRIVER, etsects)) {
    + pr_err("request_irq failed\n");
    + return -ENODEV;
    + }
    + etsects->regs = of_iomap(node, 0);
    + if (!etsects->regs) {
    + pr_err("of_iomap ptp registers failed\n");
    + return -EINVAL;
    + }
    + 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;
    +
    + 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);
    +
    + etsects->clock = ptp_clock_register(&etsects->caps);
    +
    + return IS_ERR(etsects->clock) ? PTR_ERR(etsects->clock) : 0;
    +}
    +
    +static int gianfar_ptp_remove(struct platform_device *dev)
    +{
    + gfar_write(&the_clock.regs->tmr_temask, 0);
    + gfar_write(&the_clock.regs->tmr_ctrl, 0);
    +
    + ptp_clock_unregister(the_clock.clock);
    + free_irq(the_clock.irq, &the_clock);
    + iounmap(the_clock.regs);
    +
    + return 0;
    +}
    +
    +static struct of_device_id match_table[] = {
    + { .compatible = "fsl,etsec-ptp" },
    + {},
    +};
    +
    +static struct of_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 of_register_platform_driver(&gianfar_ptp_driver);
    +}
    +
    +module_init(ptp_gianfar_init);
    +
    +static void __exit ptp_gianfar_exit(void)
    +{
    + of_unregister_platform_driver(&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/net/gianfar_ptp_reg.h b/drivers/net/gianfar_ptp_reg.h
    new file mode 100644
    index 0000000..95e171f
    --- /dev/null
    +++ b/drivers/net/gianfar_ptp_reg.h
    @@ -0,0 +1,113 @@
    +/* gianfar_ptp_reg.h
    + * Generated by regen.tcl on Thu May 13 01:38:57 PM CEST 2010
    + *
    + * PTP 1588 clock using the gianfar 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.
    + */
    +#ifndef _GIANFAR_PTP_REG_H_
    +#define _GIANFAR_PTP_REG_H_
    +
    +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 (TSEC_1588_GCLK) output phase. */
    +#define CIPH (1<<6) /* External oscillator input clock phase. */
    +#define TMSR (1<<5) /* Timer soft reset. When enabled, it resets all the timer registers and state machines. */
    +#define BYP (1<<3) /* Bypass drift compensated clock */
    +#define TE (1<<2) /* 1588 timer enable. If not enabled, all the timer registers and state machines are disabled. */
    +#define CKSEL_SHIFT (0) /* 1588 Timer reference clock source select. */
    +#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 equaled alarm time register 2 */
    +#define ALM1 (1<<16) /* Current time equaled alarm time register 1 */
    +#define PP1 (1<<7) /* Indicates that a periodic pulse has been generated based on FIPER1 register */
    +#define PP2 (1<<6) /* Indicates that a periodic pulse has been generated based on FIPER2 register */
    +#define PP3 (1<<5) /* Indicates that a periodic pulse has been generated based on FIPER3 register */
    +
    +/* Bit definitions for the TMR_TEMASK register */
    +#define ETS2EN (1<<25) /* External trigger 2 timestamp sample event enable */
    +#define ETS1EN (1<<24) /* External trigger 1 timestamp sample event 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) /* Indicates that a PTP frame has been transmitted and its timestamp is stored in TXTS2 register */
    +#define TXP1 (1<<8) /* Indicates that a PTP frame has been transmitted and its timestamp is stored in TXTS1 register */
    +#define RXP (1<<0) /* Indicates that a 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)
    +
    +#endif
    diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
    index 17be208..a4df298 100644
    --- a/drivers/ptp/Kconfig
    +++ b/drivers/ptp/Kconfig
    @@ -24,4 +24,17 @@ 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.
    +
    endmenu
    --
    1.7.0.4


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