drivers/ptp/ptp_pch.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PTP 1588 clock using the EG20T PCH
   4  *
   5  * Copyright (C) 2010 OMICRON electronics GmbH
   6  * Copyright (C) 2011-2012 LAPIS SEMICONDUCTOR Co., LTD.
   7  *
   8  * This code was derived from the IXP46X driver.
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/pci.h>
  20 #include <linux/ptp_clock_kernel.h>
  21 #include <linux/slab.h>
  22
  23 #define STATION_ADDR_LEN        20
  24 #define PCI_DEVICE_ID_PCH_1588  0x8819
  25 #define IO_MEM_BAR 1
  26
  27 #define DEFAULT_ADDEND 0xA0000000
  28 #define TICKS_NS_SHIFT  5
  29 #define N_EXT_TS        2
  30
  31 enum pch_status {
  32         PCH_SUCCESS,
  33         PCH_INVALIDPARAM,
  34         PCH_NOTIMESTAMP,
  35         PCH_INTERRUPTMODEINUSE,
  36         PCH_FAILED,
  37         PCH_UNSUPPORTED,
  38 };
  39 /**
  40  * struct pch_ts_regs - IEEE 1588 registers
  41  */
  42 struct pch_ts_regs {
  43         u32 control;
  44         u32 event;
  45         u32 addend;
  46         u32 accum;
  47         u32 test;
  48         u32 ts_compare;
  49         u32 rsystime_lo;
  50         u32 rsystime_hi;
  51         u32 systime_lo;
  52         u32 systime_hi;
  53         u32 trgt_lo;
  54         u32 trgt_hi;
  55         u32 asms_lo;
  56         u32 asms_hi;
  57         u32 amms_lo;
  58         u32 amms_hi;
  59         u32 ch_control;
  60         u32 ch_event;
  61         u32 tx_snap_lo;
  62         u32 tx_snap_hi;
  63         u32 rx_snap_lo;
  64         u32 rx_snap_hi;
  65         u32 src_uuid_lo;
  66         u32 src_uuid_hi;
  67         u32 can_status;
  68         u32 can_snap_lo;
  69         u32 can_snap_hi;
  70         u32 ts_sel;
  71         u32 ts_st[6];
  72         u32 reserve1[14];
  73         u32 stl_max_set_en;
  74         u32 stl_max_set;
  75         u32 reserve2[13];
  76         u32 srst;
  77 };
  78
  79 #define PCH_TSC_RESET           (1 << 0)
  80 #define PCH_TSC_TTM_MASK        (1 << 1)
  81 #define PCH_TSC_ASMS_MASK       (1 << 2)
  82 #define PCH_TSC_AMMS_MASK       (1 << 3)
  83 #define PCH_TSC_PPSM_MASK       (1 << 4)
  84 #define PCH_TSE_TTIPEND         (1 << 1)
  85 #define PCH_TSE_SNS             (1 << 2)
  86 #define PCH_TSE_SNM             (1 << 3)
  87 #define PCH_TSE_PPS             (1 << 4)
  88 #define PCH_CC_MM               (1 << 0)
  89 #define PCH_CC_TA               (1 << 1)
  90
  91 #define PCH_CC_MODE_SHIFT       16
  92 #define PCH_CC_MODE_MASK        0x001F0000
  93 #define PCH_CC_VERSION          (1 << 31)
  94 #define PCH_CE_TXS              (1 << 0)
  95 #define PCH_CE_RXS              (1 << 1)
  96 #define PCH_CE_OVR              (1 << 0)
  97 #define PCH_CE_VAL              (1 << 1)
  98 #define PCH_ECS_ETH             (1 << 0)
  99
 100 #define PCH_ECS_CAN             (1 << 1)
 101 #define PCH_STATION_BYTES       6
 102
 103 #define PCH_IEEE1588_ETH        (1 << 0)
 104 #define PCH_IEEE1588_CAN        (1 << 1)
 105 /**
 106  * struct pch_dev - Driver private data
 107  */
 108 struct pch_dev {
 109         struct pch_ts_regs __iomem *regs;
 110         struct ptp_clock *ptp_clock;
 111         struct ptp_clock_info caps;
 112         int exts0_enabled;
 113         int exts1_enabled;
 114
 115         u32 mem_base;
 116         u32 mem_size;
 117         u32 irq;
 118         struct pci_dev *pdev;
 119         spinlock_t register_lock;
 120 };
 121
 122 /**
 123  * struct pch_params - 1588 module parameter
 124  */
 125 struct pch_params {
 126         u8 station[STATION_ADDR_LEN];
 127 };
 128
 129 /* structure to hold the module parameters */
 130 static struct pch_params pch_param = {
 131         "00:00:00:00:00:00"
 132 };
 133
 134 /*
 135  * Register access functions
 136  */
 137 static inline void pch_eth_enable_set(struct pch_dev *chip)
 138 {
 139         u32 val;
 140         /* SET the eth_enable bit */
 141         val = ioread32(&chip->regs->ts_sel) | (PCH_ECS_ETH);
 142         iowrite32(val, (&chip->regs->ts_sel));
 143 }
 144
 145 static u64 pch_systime_read(struct pch_ts_regs __iomem *regs)
 146 {
 147         u64 ns;
 148         u32 lo, hi;
 149
 150         lo = ioread32(&regs->systime_lo);
 151         hi = ioread32(&regs->systime_hi);
 152
 153         ns = ((u64) hi) << 32;
 154         ns |= lo;
 155         ns <<= TICKS_NS_SHIFT;
 156
 157         return ns;
 158 }
 159
 160 static void pch_systime_write(struct pch_ts_regs __iomem *regs, u64 ns)
 161 {
 162         u32 hi, lo;
 163
 164         ns >>= TICKS_NS_SHIFT;
 165         hi = ns >> 32;
 166         lo = ns & 0xffffffff;
 167
 168         iowrite32(lo, &regs->systime_lo);
 169         iowrite32(hi, &regs->systime_hi);
 170 }
 171
 172 static inline void pch_block_reset(struct pch_dev *chip)
 173 {
 174         u32 val;
 175         /* Reset Hardware Assist block */
 176         val = ioread32(&chip->regs->control) | PCH_TSC_RESET;
 177         iowrite32(val, (&chip->regs->control));
 178         val = val & ~PCH_TSC_RESET;
 179         iowrite32(val, (&chip->regs->control));
 180 }
 181
 182 u32 pch_ch_control_read(struct pci_dev *pdev)
 183 {
 184         struct pch_dev *chip = pci_get_drvdata(pdev);
 185         u32 val;
 186
 187         val = ioread32(&chip->regs->ch_control);
 188
 189         return val;
 190 }
 191 EXPORT_SYMBOL(pch_ch_control_read);
 192
 193 void pch_ch_control_write(struct pci_dev *pdev, u32 val)
 194 {
 195         struct pch_dev *chip = pci_get_drvdata(pdev);
 196
 197         iowrite32(val, (&chip->regs->ch_control));
 198 }
 199 EXPORT_SYMBOL(pch_ch_control_write);
 200
 201 u32 pch_ch_event_read(struct pci_dev *pdev)
 202 {
 203         struct pch_dev *chip = pci_get_drvdata(pdev);
 204         u32 val;
 205
 206         val = ioread32(&chip->regs->ch_event);
 207
 208         return val;
 209 }
 210 EXPORT_SYMBOL(pch_ch_event_read);
 211
 212 void pch_ch_event_write(struct pci_dev *pdev, u32 val)
 213 {
 214         struct pch_dev *chip = pci_get_drvdata(pdev);
 215
 216         iowrite32(val, (&chip->regs->ch_event));
 217 }
 218 EXPORT_SYMBOL(pch_ch_event_write);
 219
 220 u32 pch_src_uuid_lo_read(struct pci_dev *pdev)
 221 {
 222         struct pch_dev *chip = pci_get_drvdata(pdev);
 223         u32 val;
 224
 225         val = ioread32(&chip->regs->src_uuid_lo);
 226
 227         return val;
 228 }
 229 EXPORT_SYMBOL(pch_src_uuid_lo_read);
 230
 231 u32 pch_src_uuid_hi_read(struct pci_dev *pdev)
 232 {
 233         struct pch_dev *chip = pci_get_drvdata(pdev);
 234         u32 val;
 235
 236         val = ioread32(&chip->regs->src_uuid_hi);
 237
 238         return val;
 239 }
 240 EXPORT_SYMBOL(pch_src_uuid_hi_read);
 241
 242 u64 pch_rx_snap_read(struct pci_dev *pdev)
 243 {
 244         struct pch_dev *chip = pci_get_drvdata(pdev);
 245         u64 ns;
 246         u32 lo, hi;
 247
 248         lo = ioread32(&chip->regs->rx_snap_lo);
 249         hi = ioread32(&chip->regs->rx_snap_hi);
 250
 251         ns = ((u64) hi) << 32;
 252         ns |= lo;
 253         ns <<= TICKS_NS_SHIFT;
 254
 255         return ns;
 256 }
 257 EXPORT_SYMBOL(pch_rx_snap_read);
 258
 259 u64 pch_tx_snap_read(struct pci_dev *pdev)
 260 {
 261         struct pch_dev *chip = pci_get_drvdata(pdev);
 262         u64 ns;
 263         u32 lo, hi;
 264
 265         lo = ioread32(&chip->regs->tx_snap_lo);
 266         hi = ioread32(&chip->regs->tx_snap_hi);
 267
 268         ns = ((u64) hi) << 32;
 269         ns |= lo;
 270         ns <<= TICKS_NS_SHIFT;
 271
 272         return ns;
 273 }
 274 EXPORT_SYMBOL(pch_tx_snap_read);
 275
 276 /* This function enables all 64 bits in system time registers [high & low].
 277 This is a work-around for non continuous value in the SystemTime Register*/
 278 static void pch_set_system_time_count(struct pch_dev *chip)
 279 {
 280         iowrite32(0x01, &chip->regs->stl_max_set_en);
 281         iowrite32(0xFFFFFFFF, &chip->regs->stl_max_set);
 282         iowrite32(0x00, &chip->regs->stl_max_set_en);
 283 }
 284
 285 static void pch_reset(struct pch_dev *chip)
 286 {
 287         /* Reset Hardware Assist */
 288         pch_block_reset(chip);
 289
 290         /* enable all 32 bits in system time registers */
 291         pch_set_system_time_count(chip);
 292 }
 293
 294 /**
 295  * pch_set_station_address() - This API sets the station address used by
 296  *                                  IEEE 1588 hardware when looking at PTP
 297  *                                  traffic on the  ethernet interface
 298  * @addr:       dress which contain the column separated address to be used.
 299  */
 300 int pch_set_station_address(u8 *addr, struct pci_dev *pdev)
 301 {
 302         s32 i;
 303         struct pch_dev *chip = pci_get_drvdata(pdev);
 304
 305         /* Verify the parameter */
 306         if ((chip->regs == NULL) || addr == (u8 *)NULL) {
 307                 dev_err(&pdev->dev,
 308                         "invalid params returning PCH_INVALIDPARAM\n");
 309                 return PCH_INVALIDPARAM;
 310         }
 311         /* For all station address bytes */
 312         for (i = 0; i < PCH_STATION_BYTES; i++) {
 313                 u32 val;
 314                 s32 tmp;
 315
 316                 tmp = hex_to_bin(addr[i * 3]);
 317                 if (tmp < 0) {
 318                         dev_err(&pdev->dev,
 319                                 "invalid params returning PCH_INVALIDPARAM\n");
 320                         return PCH_INVALIDPARAM;
 321                 }
 322                 val = tmp * 16;
 323                 tmp = hex_to_bin(addr[(i * 3) + 1]);
 324                 if (tmp < 0) {
 325                         dev_err(&pdev->dev,
 326                                 "invalid params returning PCH_INVALIDPARAM\n");
 327                         return PCH_INVALIDPARAM;
 328                 }
 329                 val += tmp;
 330                 /* Expects ':' separated addresses */
 331                 if ((i < 5) && (addr[(i * 3) + 2] != ':')) {
 332                         dev_err(&pdev->dev,
 333                                 "invalid params returning PCH_INVALIDPARAM\n");
 334                         return PCH_INVALIDPARAM;
 335                 }
 336
 337                 /* Ideally we should set the address only after validating
 338                                                          entire string */
 339                 dev_dbg(&pdev->dev, "invoking pch_station_set\n");
 340                 iowrite32(val, &chip->regs->ts_st[i]);
 341         }
 342         return 0;
 343 }
 344 EXPORT_SYMBOL(pch_set_station_address);
 345
 346 /*
 347  * Interrupt service routine
 348  */
 349 static irqreturn_t isr(int irq, void *priv)
 350 {
 351         struct pch_dev *pch_dev = priv;
 352         struct pch_ts_regs __iomem *regs = pch_dev->regs;
 353         struct ptp_clock_event event;
 354         u32 ack = 0, lo, hi, val;
 355
 356         val = ioread32(&regs->event);
 357
 358         if (val & PCH_TSE_SNS) {
 359                 ack |= PCH_TSE_SNS;
 360                 if (pch_dev->exts0_enabled) {
 361                         hi = ioread32(&regs->asms_hi);
 362                         lo = ioread32(&regs->asms_lo);
 363                         event.type = PTP_CLOCK_EXTTS;
 364                         event.index = 0;
 365                         event.timestamp = ((u64) hi) << 32;
 366                         event.timestamp |= lo;
 367                         event.timestamp <<= TICKS_NS_SHIFT;
 368                         ptp_clock_event(pch_dev->ptp_clock, &event);
 369                 }
 370         }
 371
 372         if (val & PCH_TSE_SNM) {
 373                 ack |= PCH_TSE_SNM;
 374                 if (pch_dev->exts1_enabled) {
 375                         hi = ioread32(&regs->amms_hi);
 376                         lo = ioread32(&regs->amms_lo);
 377                         event.type = PTP_CLOCK_EXTTS;
 378                         event.index = 1;
 379                         event.timestamp = ((u64) hi) << 32;
 380                         event.timestamp |= lo;
 381                         event.timestamp <<= TICKS_NS_SHIFT;
 382                         ptp_clock_event(pch_dev->ptp_clock, &event);
 383                 }
 384         }
 385
 386         if (val & PCH_TSE_TTIPEND)
 387                 ack |= PCH_TSE_TTIPEND; /* this bit seems to be always set */
 388
 389         if (ack) {
 390                 iowrite32(ack, &regs->event);
 391                 return IRQ_HANDLED;
 392         } else
 393                 return IRQ_NONE;
 394 }
 395
 396 /*
 397  * PTP clock operations
 398  */
 399
 400 static int ptp_pch_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
 401 {
 402         u64 adj;
 403         u32 diff, addend;
 404         int neg_adj = 0;
 405         struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
 406         struct pch_ts_regs __iomem *regs = pch_dev->regs;
 407
 408         if (ppb < 0) {
 409                 neg_adj = 1;
 410                 ppb = -ppb;
 411         }
 412         addend = DEFAULT_ADDEND;
 413         adj = addend;
 414         adj *= ppb;
 415         diff = div_u64(adj, 1000000000ULL);
 416
 417         addend = neg_adj ? addend - diff : addend + diff;
 418
 419         iowrite32(addend, &regs->addend);
 420
 421         return 0;
 422 }
 423
 424 static int ptp_pch_adjtime(struct ptp_clock_info *ptp, s64 delta)
 425 {
 426         s64 now;
 427         unsigned long flags;
 428         struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
 429         struct pch_ts_regs __iomem *regs = pch_dev->regs;
 430
 431         spin_lock_irqsave(&pch_dev->register_lock, flags);
 432         now = pch_systime_read(regs);
 433         now += delta;
 434         pch_systime_write(regs, now);
 435         spin_unlock_irqrestore(&pch_dev->register_lock, flags);
 436
 437         return 0;
 438 }
 439
 440 static int ptp_pch_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
 441 {
 442         u64 ns;
 443         unsigned long flags;
 444         struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
 445         struct pch_ts_regs __iomem *regs = pch_dev->regs;
 446
 447         spin_lock_irqsave(&pch_dev->register_lock, flags);
 448         ns = pch_systime_read(regs);
 449         spin_unlock_irqrestore(&pch_dev->register_lock, flags);
 450
 451         *ts = ns_to_timespec64(ns);
 452         return 0;
 453 }
 454
 455 static int ptp_pch_settime(struct ptp_clock_info *ptp,
 456                            const struct timespec64 *ts)
 457 {
 458         u64 ns;
 459         unsigned long flags;
 460         struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
 461         struct pch_ts_regs __iomem *regs = pch_dev->regs;
 462
 463         ns = timespec64_to_ns(ts);
 464
 465         spin_lock_irqsave(&pch_dev->register_lock, flags);
 466         pch_systime_write(regs, ns);
 467         spin_unlock_irqrestore(&pch_dev->register_lock, flags);
 468
 469         return 0;
 470 }
 471
 472 static int ptp_pch_enable(struct ptp_clock_info *ptp,
 473                           struct ptp_clock_request *rq, int on)
 474 {
 475         struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
 476
 477         switch (rq->type) {
 478         case PTP_CLK_REQ_EXTTS:
 479                 switch (rq->extts.index) {
 480                 case 0:
 481                         pch_dev->exts0_enabled = on ? 1 : 0;
 482                         break;
 483                 case 1:
 484                         pch_dev->exts1_enabled = on ? 1 : 0;
 485                         break;
 486                 default:
 487                         return -EINVAL;
 488                 }
 489                 return 0;
 490         default:
 491                 break;
 492         }
 493
 494         return -EOPNOTSUPP;
 495 }
 496
 497 static const struct ptp_clock_info ptp_pch_caps = {
 498         .owner          = THIS_MODULE,
 499         .name           = "PCH timer",
 500         .max_adj        = 50000000,
 501         .n_ext_ts       = N_EXT_TS,
 502         .n_pins         = 0,
 503         .pps            = 0,
 504         .adjfreq        = ptp_pch_adjfreq,
 505         .adjtime        = ptp_pch_adjtime,
 506         .gettime64      = ptp_pch_gettime,
 507         .settime64      = ptp_pch_settime,
 508         .enable         = ptp_pch_enable,
 509 };
 510
 511 #define pch_suspend NULL
 512 #define pch_resume NULL
 513
 514 static void pch_remove(struct pci_dev *pdev)
 515 {
 516         struct pch_dev *chip = pci_get_drvdata(pdev);
 517
 518         ptp_clock_unregister(chip->ptp_clock);
 519         /* free the interrupt */
 520         if (pdev->irq != 0)
 521                 free_irq(pdev->irq, chip);
 522
 523         /* unmap the virtual IO memory space */
 524         if (chip->regs != NULL) {
 525                 iounmap(chip->regs);
 526                 chip->regs = NULL;
 527         }
 528         /* release the reserved IO memory space */
 529         if (chip->mem_base != 0) {
 530                 release_mem_region(chip->mem_base, chip->mem_size);
 531                 chip->mem_base = 0;
 532         }
 533         pci_disable_device(pdev);
 534         kfree(chip);
 535         dev_info(&pdev->dev, "complete\n");
 536 }
 537
 538 static s32
 539 pch_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 540 {
 541         s32 ret;
 542         unsigned long flags;
 543         struct pch_dev *chip;
 544
 545         chip = kzalloc(sizeof(struct pch_dev), GFP_KERNEL);
 546         if (chip == NULL)
 547                 return -ENOMEM;
 548
 549         /* enable the 1588 pci device */
 550         ret = pci_enable_device(pdev);
 551         if (ret != 0) {
 552                 dev_err(&pdev->dev, "could not enable the pci device\n");
 553                 goto err_pci_en;
 554         }
 555
 556         chip->mem_base = pci_resource_start(pdev, IO_MEM_BAR);
 557         if (!chip->mem_base) {
 558                 dev_err(&pdev->dev, "could not locate IO memory address\n");
 559                 ret = -ENODEV;
 560                 goto err_pci_start;
 561         }
 562
 563         /* retrieve the available length of the IO memory space */
 564         chip->mem_size = pci_resource_len(pdev, IO_MEM_BAR);
 565
 566         /* allocate the memory for the device registers */
 567         if (!request_mem_region(chip->mem_base, chip->mem_size, "1588_regs")) {
 568                 dev_err(&pdev->dev,
 569                         "could not allocate register memory space\n");
 570                 ret = -EBUSY;
 571                 goto err_req_mem_region;
 572         }
 573
 574         /* get the virtual address to the 1588 registers */
 575         chip->regs = ioremap(chip->mem_base, chip->mem_size);
 576
 577         if (!chip->regs) {
 578                 dev_err(&pdev->dev, "Could not get virtual address\n");
 579                 ret = -ENOMEM;
 580                 goto err_ioremap;
 581         }
 582
 583         chip->caps = ptp_pch_caps;
 584         chip->ptp_clock = ptp_clock_register(&chip->caps, &pdev->dev);
 585         if (IS_ERR(chip->ptp_clock)) {
 586                 ret = PTR_ERR(chip->ptp_clock);
 587                 goto err_ptp_clock_reg;
 588         }
 589
 590         spin_lock_init(&chip->register_lock);
 591
 592         ret = request_irq(pdev->irq, &isr, IRQF_SHARED, KBUILD_MODNAME, chip);
 593         if (ret != 0) {
 594                 dev_err(&pdev->dev, "failed to get irq %d\n", pdev->irq);
 595                 goto err_req_irq;
 596         }
 597
 598         /* indicate success */
 599         chip->irq = pdev->irq;
 600         chip->pdev = pdev;
 601         pci_set_drvdata(pdev, chip);
 602
 603         spin_lock_irqsave(&chip->register_lock, flags);
 604         /* reset the ieee1588 h/w */
 605         pch_reset(chip);
 606
 607         iowrite32(DEFAULT_ADDEND, &chip->regs->addend);
 608         iowrite32(1, &chip->regs->trgt_lo);
 609         iowrite32(0, &chip->regs->trgt_hi);
 610         iowrite32(PCH_TSE_TTIPEND, &chip->regs->event);
 611
 612         pch_eth_enable_set(chip);
 613
 614         if (strcmp(pch_param.station, "00:00:00:00:00:00") != 0) {
 615                 if (pch_set_station_address(pch_param.station, pdev) != 0) {
 616                         dev_err(&pdev->dev,
 617                         "Invalid station address parameter\n"
 618                         "Module loaded but station address not set correctly\n"
 619                         );
 620                 }
 621         }
 622         spin_unlock_irqrestore(&chip->register_lock, flags);
 623         return 0;
 624
 625 err_req_irq:
 626         ptp_clock_unregister(chip->ptp_clock);
 627 err_ptp_clock_reg:
 628         iounmap(chip->regs);
 629         chip->regs = NULL;
 630
 631 err_ioremap:
 632         release_mem_region(chip->mem_base, chip->mem_size);
 633
 634 err_req_mem_region:
 635         chip->mem_base = 0;
 636
 637 err_pci_start:
 638         pci_disable_device(pdev);
 639
 640 err_pci_en:
 641         kfree(chip);
 642         dev_err(&pdev->dev, "probe failed(ret=0x%x)\n", ret);
 643
 644         return ret;
 645 }
 646
 647 static const struct pci_device_id pch_ieee1588_pcidev_id[] = {
 648         {
 649           .vendor = PCI_VENDOR_ID_INTEL,
 650           .device = PCI_DEVICE_ID_PCH_1588
 651          },
 652         {0}
 653 };
 654
 655 static SIMPLE_DEV_PM_OPS(pch_pm_ops, pch_suspend, pch_resume);
 656
 657 static struct pci_driver pch_driver = {
 658         .name = KBUILD_MODNAME,
 659         .id_table = pch_ieee1588_pcidev_id,
 660         .probe = pch_probe,
 661         .remove = pch_remove,
 662         .driver.pm = &pch_pm_ops,
 663 };
 664
 665 static void __exit ptp_pch_exit(void)
 666 {
 667         pci_unregister_driver(&pch_driver);
 668 }
 669
 670 static s32 __init ptp_pch_init(void)
 671 {
 672         s32 ret;
 673
 674         /* register the driver with the pci core */
 675         ret = pci_register_driver(&pch_driver);
 676
 677         return ret;
 678 }
 679
 680 module_init(ptp_pch_init);
 681 module_exit(ptp_pch_exit);
 682
 683 module_param_string(station,
 684                     pch_param.station, sizeof(pch_param.station), 0444);
 685 MODULE_PARM_DESC(station,
 686          "IEEE 1588 station address to use - colon separated hex values");
 687
 688 MODULE_AUTHOR("LAPIS SEMICONDUCTOR, <tshimizu818@gmail.com>");
 689 MODULE_DESCRIPTION("PTP clock using the EG20T timer");
 690 MODULE_LICENSE("GPL");