drivers/ptp/ptp_qoriq.c

   1 /*
   2  * PTP 1588 clock for Freescale QorIQ 1588 timer
   3  *
   4  * Copyright (C) 2010 OMICRON electronics GmbH
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/device.h>
  24 #include <linux/hrtimer.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/of.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/timex.h>
  31 #include <linux/slab.h>
  32 #include <linux/clk.h>
  33
  34 #include <linux/fsl/ptp_qoriq.h>
  35
  36 /*
  37  * Register access functions
  38  */
  39
  40 /* Caller must hold qoriq_ptp->lock. */
  41 static u64 tmr_cnt_read(struct qoriq_ptp *qoriq_ptp)
  42 {
  43         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
  44         u64 ns;
  45         u32 lo, hi;
  46
  47         lo = qoriq_read(&regs->ctrl_regs->tmr_cnt_l);
  48         hi = qoriq_read(&regs->ctrl_regs->tmr_cnt_h);
  49         ns = ((u64) hi) << 32;
  50         ns |= lo;
  51         return ns;
  52 }
  53
  54 /* Caller must hold qoriq_ptp->lock. */
  55 static void tmr_cnt_write(struct qoriq_ptp *qoriq_ptp, u64 ns)
  56 {
  57         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
  58         u32 hi = ns >> 32;
  59         u32 lo = ns & 0xffffffff;
  60
  61         qoriq_write(&regs->ctrl_regs->tmr_cnt_l, lo);
  62         qoriq_write(&regs->ctrl_regs->tmr_cnt_h, hi);
  63 }
  64
  65 /* Caller must hold qoriq_ptp->lock. */
  66 static void set_alarm(struct qoriq_ptp *qoriq_ptp)
  67 {
  68         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
  69         u64 ns;
  70         u32 lo, hi;
  71
  72         ns = tmr_cnt_read(qoriq_ptp) + 1500000000ULL;
  73         ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
  74         ns -= qoriq_ptp->tclk_period;
  75         hi = ns >> 32;
  76         lo = ns & 0xffffffff;
  77         qoriq_write(&regs->alarm_regs->tmr_alarm1_l, lo);
  78         qoriq_write(&regs->alarm_regs->tmr_alarm1_h, hi);
  79 }
  80
  81 /* Caller must hold qoriq_ptp->lock. */
  82 static void set_fipers(struct qoriq_ptp *qoriq_ptp)
  83 {
  84         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
  85
  86         set_alarm(qoriq_ptp);
  87         qoriq_write(&regs->fiper_regs->tmr_fiper1, qoriq_ptp->tmr_fiper1);
  88         qoriq_write(&regs->fiper_regs->tmr_fiper2, qoriq_ptp->tmr_fiper2);
  89 }
  90
  91 /*
  92  * Interrupt service routine
  93  */
  94
  95 static irqreturn_t isr(int irq, void *priv)
  96 {
  97         struct qoriq_ptp *qoriq_ptp = priv;
  98         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
  99         struct ptp_clock_event event;
 100         u64 ns;
 101         u32 ack = 0, lo, hi, mask, val;
 102
 103         val = qoriq_read(&regs->ctrl_regs->tmr_tevent);
 104
 105         if (val & ETS1) {
 106                 ack |= ETS1;
 107                 hi = qoriq_read(&regs->etts_regs->tmr_etts1_h);
 108                 lo = qoriq_read(&regs->etts_regs->tmr_etts1_l);
 109                 event.type = PTP_CLOCK_EXTTS;
 110                 event.index = 0;
 111                 event.timestamp = ((u64) hi) << 32;
 112                 event.timestamp |= lo;
 113                 ptp_clock_event(qoriq_ptp->clock, &event);
 114         }
 115
 116         if (val & ETS2) {
 117                 ack |= ETS2;
 118                 hi = qoriq_read(&regs->etts_regs->tmr_etts2_h);
 119                 lo = qoriq_read(&regs->etts_regs->tmr_etts2_l);
 120                 event.type = PTP_CLOCK_EXTTS;
 121                 event.index = 1;
 122                 event.timestamp = ((u64) hi) << 32;
 123                 event.timestamp |= lo;
 124                 ptp_clock_event(qoriq_ptp->clock, &event);
 125         }
 126
 127         if (val & ALM2) {
 128                 ack |= ALM2;
 129                 if (qoriq_ptp->alarm_value) {
 130                         event.type = PTP_CLOCK_ALARM;
 131                         event.index = 0;
 132                         event.timestamp = qoriq_ptp->alarm_value;
 133                         ptp_clock_event(qoriq_ptp->clock, &event);
 134                 }
 135                 if (qoriq_ptp->alarm_interval) {
 136                         ns = qoriq_ptp->alarm_value + qoriq_ptp->alarm_interval;
 137                         hi = ns >> 32;
 138                         lo = ns & 0xffffffff;
 139                         spin_lock(&qoriq_ptp->lock);
 140                         qoriq_write(&regs->alarm_regs->tmr_alarm2_l, lo);
 141                         qoriq_write(&regs->alarm_regs->tmr_alarm2_h, hi);
 142                         spin_unlock(&qoriq_ptp->lock);
 143                         qoriq_ptp->alarm_value = ns;
 144                 } else {
 145                         qoriq_write(&regs->ctrl_regs->tmr_tevent, ALM2);
 146                         spin_lock(&qoriq_ptp->lock);
 147                         mask = qoriq_read(&regs->ctrl_regs->tmr_temask);
 148                         mask &= ~ALM2EN;
 149                         qoriq_write(&regs->ctrl_regs->tmr_temask, mask);
 150                         spin_unlock(&qoriq_ptp->lock);
 151                         qoriq_ptp->alarm_value = 0;
 152                         qoriq_ptp->alarm_interval = 0;
 153                 }
 154         }
 155
 156         if (val & PP1) {
 157                 ack |= PP1;
 158                 event.type = PTP_CLOCK_PPS;
 159                 ptp_clock_event(qoriq_ptp->clock, &event);
 160         }
 161
 162         if (ack) {
 163                 qoriq_write(&regs->ctrl_regs->tmr_tevent, ack);
 164                 return IRQ_HANDLED;
 165         } else
 166                 return IRQ_NONE;
 167 }
 168
 169 /*
 170  * PTP clock operations
 171  */
 172
 173 static int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 174 {
 175         u64 adj, diff;
 176         u32 tmr_add;
 177         int neg_adj = 0;
 178         struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
 179         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
 180
 181         if (scaled_ppm < 0) {
 182                 neg_adj = 1;
 183                 scaled_ppm = -scaled_ppm;
 184         }
 185         tmr_add = qoriq_ptp->tmr_add;
 186         adj = tmr_add;
 187
 188         /* calculate diff as adj*(scaled_ppm/65536)/1000000
 189          * and round() to the nearest integer
 190          */
 191         adj *= scaled_ppm;
 192         diff = div_u64(adj, 8000000);
 193         diff = (diff >> 13) + ((diff >> 12) & 1);
 194
 195         tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
 196
 197         qoriq_write(&regs->ctrl_regs->tmr_add, tmr_add);
 198
 199         return 0;
 200 }
 201
 202 static int ptp_qoriq_adjtime(struct ptp_clock_info *ptp, s64 delta)
 203 {
 204         s64 now;
 205         unsigned long flags;
 206         struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
 207
 208         spin_lock_irqsave(&qoriq_ptp->lock, flags);
 209
 210         now = tmr_cnt_read(qoriq_ptp);
 211         now += delta;
 212         tmr_cnt_write(qoriq_ptp, now);
 213         set_fipers(qoriq_ptp);
 214
 215         spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 216
 217         return 0;
 218 }
 219
 220 static int ptp_qoriq_gettime(struct ptp_clock_info *ptp,
 221                                struct timespec64 *ts)
 222 {
 223         u64 ns;
 224         unsigned long flags;
 225         struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
 226
 227         spin_lock_irqsave(&qoriq_ptp->lock, flags);
 228
 229         ns = tmr_cnt_read(qoriq_ptp);
 230
 231         spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 232
 233         *ts = ns_to_timespec64(ns);
 234
 235         return 0;
 236 }
 237
 238 static int ptp_qoriq_settime(struct ptp_clock_info *ptp,
 239                                const struct timespec64 *ts)
 240 {
 241         u64 ns;
 242         unsigned long flags;
 243         struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
 244
 245         ns = timespec64_to_ns(ts);
 246
 247         spin_lock_irqsave(&qoriq_ptp->lock, flags);
 248
 249         tmr_cnt_write(qoriq_ptp, ns);
 250         set_fipers(qoriq_ptp);
 251
 252         spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 253
 254         return 0;
 255 }
 256
 257 static int ptp_qoriq_enable(struct ptp_clock_info *ptp,
 258                               struct ptp_clock_request *rq, int on)
 259 {
 260         struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
 261         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
 262         unsigned long flags;
 263         u32 bit, mask;
 264
 265         switch (rq->type) {
 266         case PTP_CLK_REQ_EXTTS:
 267                 switch (rq->extts.index) {
 268                 case 0:
 269                         bit = ETS1EN;
 270                         break;
 271                 case 1:
 272                         bit = ETS2EN;
 273                         break;
 274                 default:
 275                         return -EINVAL;
 276                 }
 277                 spin_lock_irqsave(&qoriq_ptp->lock, flags);
 278                 mask = qoriq_read(&regs->ctrl_regs->tmr_temask);
 279                 if (on)
 280                         mask |= bit;
 281                 else
 282                         mask &= ~bit;
 283                 qoriq_write(&regs->ctrl_regs->tmr_temask, mask);
 284                 spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 285                 return 0;
 286
 287         case PTP_CLK_REQ_PPS:
 288                 spin_lock_irqsave(&qoriq_ptp->lock, flags);
 289                 mask = qoriq_read(&regs->ctrl_regs->tmr_temask);
 290                 if (on)
 291                         mask |= PP1EN;
 292                 else
 293                         mask &= ~PP1EN;
 294                 qoriq_write(&regs->ctrl_regs->tmr_temask, mask);
 295                 spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 296                 return 0;
 297
 298         default:
 299                 break;
 300         }
 301
 302         return -EOPNOTSUPP;
 303 }
 304
 305 static const struct ptp_clock_info ptp_qoriq_caps = {
 306         .owner          = THIS_MODULE,
 307         .name           = "qoriq ptp clock",
 308         .max_adj        = 512000,
 309         .n_alarm        = 0,
 310         .n_ext_ts       = N_EXT_TS,
 311         .n_per_out      = 0,
 312         .n_pins         = 0,
 313         .pps            = 1,
 314         .adjfine        = ptp_qoriq_adjfine,
 315         .adjtime        = ptp_qoriq_adjtime,
 316         .gettime64      = ptp_qoriq_gettime,
 317         .settime64      = ptp_qoriq_settime,
 318         .enable         = ptp_qoriq_enable,
 319 };
 320
 321 /**
 322  * qoriq_ptp_nominal_freq - calculate nominal frequency according to
 323  *                          reference clock frequency
 324  *
 325  * @clk_src: reference clock frequency
 326  *
 327  * The nominal frequency is the desired clock frequency.
 328  * It should be less than the reference clock frequency.
 329  * It should be a factor of 1000MHz.
 330  *
 331  * Return the nominal frequency
 332  */
 333 static u32 qoriq_ptp_nominal_freq(u32 clk_src)
 334 {
 335         u32 remainder = 0;
 336
 337         clk_src /= 1000000;
 338         remainder = clk_src % 100;
 339         if (remainder) {
 340                 clk_src -= remainder;
 341                 clk_src += 100;
 342         }
 343
 344         do {
 345                 clk_src -= 100;
 346
 347         } while (1000 % clk_src);
 348
 349         return clk_src * 1000000;
 350 }
 351
 352 /**
 353  * qoriq_ptp_auto_config - calculate a set of default configurations
 354  *
 355  * @qoriq_ptp: pointer to qoriq_ptp
 356  * @node: pointer to device_node
 357  *
 358  * If below dts properties are not provided, this function will be
 359  * called to calculate a set of default configurations for them.
 360  *   "fsl,tclk-period"
 361  *   "fsl,tmr-prsc"
 362  *   "fsl,tmr-add"
 363  *   "fsl,tmr-fiper1"
 364  *   "fsl,tmr-fiper2"
 365  *   "fsl,max-adj"
 366  *
 367  * Return 0 if success
 368  */
 369 static int qoriq_ptp_auto_config(struct qoriq_ptp *qoriq_ptp,
 370                                  struct device_node *node)
 371 {
 372         struct clk *clk;
 373         u64 freq_comp;
 374         u64 max_adj;
 375         u32 nominal_freq;
 376         u32 clk_src = 0;
 377
 378         qoriq_ptp->cksel = DEFAULT_CKSEL;
 379
 380         clk = of_clk_get(node, 0);
 381         if (!IS_ERR(clk)) {
 382                 clk_src = clk_get_rate(clk);
 383                 clk_put(clk);
 384         }
 385
 386         if (clk_src <= 100000000UL) {
 387                 pr_err("error reference clock value, or lower than 100MHz\n");
 388                 return -EINVAL;
 389         }
 390
 391         nominal_freq = qoriq_ptp_nominal_freq(clk_src);
 392         if (!nominal_freq)
 393                 return -EINVAL;
 394
 395         qoriq_ptp->tclk_period = 1000000000UL / nominal_freq;
 396         qoriq_ptp->tmr_prsc = DEFAULT_TMR_PRSC;
 397
 398         /* Calculate initial frequency compensation value for TMR_ADD register.
 399          * freq_comp = ceil(2^32 / freq_ratio)
 400          * freq_ratio = reference_clock_freq / nominal_freq
 401          */
 402         freq_comp = ((u64)1 << 32) * nominal_freq;
 403         if (do_div(freq_comp, clk_src))
 404                 freq_comp++;
 405
 406         qoriq_ptp->tmr_add = freq_comp;
 407         qoriq_ptp->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - qoriq_ptp->tclk_period;
 408         qoriq_ptp->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - qoriq_ptp->tclk_period;
 409
 410         /* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
 411          * freq_ratio = reference_clock_freq / nominal_freq
 412          */
 413         max_adj = 1000000000ULL * (clk_src - nominal_freq);
 414         max_adj = max_adj / nominal_freq - 1;
 415         qoriq_ptp->caps.max_adj = max_adj;
 416
 417         return 0;
 418 }
 419
 420 static int qoriq_ptp_probe(struct platform_device *dev)
 421 {
 422         struct device_node *node = dev->dev.of_node;
 423         struct qoriq_ptp *qoriq_ptp;
 424         struct qoriq_ptp_registers *regs;
 425         struct timespec64 now;
 426         int err = -ENOMEM;
 427         u32 tmr_ctrl;
 428         unsigned long flags;
 429         void __iomem *base;
 430
 431         qoriq_ptp = kzalloc(sizeof(*qoriq_ptp), GFP_KERNEL);
 432         if (!qoriq_ptp)
 433                 goto no_memory;
 434
 435         err = -EINVAL;
 436
 437         qoriq_ptp->caps = ptp_qoriq_caps;
 438
 439         if (of_property_read_u32(node, "fsl,cksel", &qoriq_ptp->cksel))
 440                 qoriq_ptp->cksel = DEFAULT_CKSEL;
 441
 442         if (of_property_read_u32(node,
 443                                  "fsl,tclk-period", &qoriq_ptp->tclk_period) ||
 444             of_property_read_u32(node,
 445                                  "fsl,tmr-prsc", &qoriq_ptp->tmr_prsc) ||
 446             of_property_read_u32(node,
 447                                  "fsl,tmr-add", &qoriq_ptp->tmr_add) ||
 448             of_property_read_u32(node,
 449                                  "fsl,tmr-fiper1", &qoriq_ptp->tmr_fiper1) ||
 450             of_property_read_u32(node,
 451                                  "fsl,tmr-fiper2", &qoriq_ptp->tmr_fiper2) ||
 452             of_property_read_u32(node,
 453                                  "fsl,max-adj", &qoriq_ptp->caps.max_adj)) {
 454                 pr_warn("device tree node missing required elements, try automatic configuration\n");
 455
 456                 if (qoriq_ptp_auto_config(qoriq_ptp, node))
 457                         goto no_config;
 458         }
 459
 460         err = -ENODEV;
 461
 462         qoriq_ptp->irq = platform_get_irq(dev, 0);
 463
 464         if (qoriq_ptp->irq < 0) {
 465                 pr_err("irq not in device tree\n");
 466                 goto no_node;
 467         }
 468         if (request_irq(qoriq_ptp->irq, isr, IRQF_SHARED, DRIVER, qoriq_ptp)) {
 469                 pr_err("request_irq failed\n");
 470                 goto no_node;
 471         }
 472
 473         qoriq_ptp->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
 474         if (!qoriq_ptp->rsrc) {
 475                 pr_err("no resource\n");
 476                 goto no_resource;
 477         }
 478         if (request_resource(&iomem_resource, qoriq_ptp->rsrc)) {
 479                 pr_err("resource busy\n");
 480                 goto no_resource;
 481         }
 482
 483         spin_lock_init(&qoriq_ptp->lock);
 484
 485         base = ioremap(qoriq_ptp->rsrc->start,
 486                        resource_size(qoriq_ptp->rsrc));
 487         if (!base) {
 488                 pr_err("ioremap ptp registers failed\n");
 489                 goto no_ioremap;
 490         }
 491
 492         qoriq_ptp->base = base;
 493
 494         if (of_device_is_compatible(node, "fsl,fman-ptp-timer")) {
 495                 qoriq_ptp->regs.ctrl_regs = base + FMAN_CTRL_REGS_OFFSET;
 496                 qoriq_ptp->regs.alarm_regs = base + FMAN_ALARM_REGS_OFFSET;
 497                 qoriq_ptp->regs.fiper_regs = base + FMAN_FIPER_REGS_OFFSET;
 498                 qoriq_ptp->regs.etts_regs = base + FMAN_ETTS_REGS_OFFSET;
 499         } else {
 500                 qoriq_ptp->regs.ctrl_regs = base + CTRL_REGS_OFFSET;
 501                 qoriq_ptp->regs.alarm_regs = base + ALARM_REGS_OFFSET;
 502                 qoriq_ptp->regs.fiper_regs = base + FIPER_REGS_OFFSET;
 503                 qoriq_ptp->regs.etts_regs = base + ETTS_REGS_OFFSET;
 504         }
 505
 506         ktime_get_real_ts64(&now);
 507         ptp_qoriq_settime(&qoriq_ptp->caps, &now);
 508
 509         tmr_ctrl =
 510           (qoriq_ptp->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
 511           (qoriq_ptp->cksel & CKSEL_MASK) << CKSEL_SHIFT;
 512
 513         spin_lock_irqsave(&qoriq_ptp->lock, flags);
 514
 515         regs = &qoriq_ptp->regs;
 516         qoriq_write(&regs->ctrl_regs->tmr_ctrl,   tmr_ctrl);
 517         qoriq_write(&regs->ctrl_regs->tmr_add,    qoriq_ptp->tmr_add);
 518         qoriq_write(&regs->ctrl_regs->tmr_prsc,   qoriq_ptp->tmr_prsc);
 519         qoriq_write(&regs->fiper_regs->tmr_fiper1, qoriq_ptp->tmr_fiper1);
 520         qoriq_write(&regs->fiper_regs->tmr_fiper2, qoriq_ptp->tmr_fiper2);
 521         set_alarm(qoriq_ptp);
 522         qoriq_write(&regs->ctrl_regs->tmr_ctrl,   tmr_ctrl|FIPERST|RTPE|TE|FRD);
 523
 524         spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
 525
 526         qoriq_ptp->clock = ptp_clock_register(&qoriq_ptp->caps, &dev->dev);
 527         if (IS_ERR(qoriq_ptp->clock)) {
 528                 err = PTR_ERR(qoriq_ptp->clock);
 529                 goto no_clock;
 530         }
 531         qoriq_ptp->phc_index = ptp_clock_index(qoriq_ptp->clock);
 532
 533         platform_set_drvdata(dev, qoriq_ptp);
 534
 535         return 0;
 536
 537 no_clock:
 538         iounmap(qoriq_ptp->base);
 539 no_ioremap:
 540         release_resource(qoriq_ptp->rsrc);
 541 no_resource:
 542         free_irq(qoriq_ptp->irq, qoriq_ptp);
 543 no_config:
 544 no_node:
 545         kfree(qoriq_ptp);
 546 no_memory:
 547         return err;
 548 }
 549
 550 static int qoriq_ptp_remove(struct platform_device *dev)
 551 {
 552         struct qoriq_ptp *qoriq_ptp = platform_get_drvdata(dev);
 553         struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
 554
 555         qoriq_write(&regs->ctrl_regs->tmr_temask, 0);
 556         qoriq_write(&regs->ctrl_regs->tmr_ctrl,   0);
 557
 558         ptp_clock_unregister(qoriq_ptp->clock);
 559         iounmap(qoriq_ptp->base);
 560         release_resource(qoriq_ptp->rsrc);
 561         free_irq(qoriq_ptp->irq, qoriq_ptp);
 562         kfree(qoriq_ptp);
 563
 564         return 0;
 565 }
 566
 567 static const struct of_device_id match_table[] = {
 568         { .compatible = "fsl,etsec-ptp" },
 569         { .compatible = "fsl,fman-ptp-timer" },
 570         {},
 571 };
 572 MODULE_DEVICE_TABLE(of, match_table);
 573
 574 static struct platform_driver qoriq_ptp_driver = {
 575         .driver = {
 576                 .name           = "ptp_qoriq",
 577                 .of_match_table = match_table,
 578         },
 579         .probe       = qoriq_ptp_probe,
 580         .remove      = qoriq_ptp_remove,
 581 };
 582
 583 module_platform_driver(qoriq_ptp_driver);
 584
 585 MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
 586 MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer");
 587 MODULE_LICENSE("GPL");