1 /* 2 * PTP 1588 clock using the EG20T PCH 3 * 4 * Copyright (C) 2010 OMICRON electronics GmbH 5 * Copyright (C) 2011-2012 LAPIS SEMICONDUCTOR Co., LTD. 6 * 7 * This code was derived from the IXP46X driver. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; version 2 of the License. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 21 */ 22 23 #include <linux/device.h> 24 #include <linux/err.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/io.h> 28 #include <linux/irq.h> 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/pci.h> 32 #include <linux/ptp_clock_kernel.h> 33 #include <linux/slab.h> 34 35 #define STATION_ADDR_LEN 20 36 #define PCI_DEVICE_ID_PCH_1588 0x8819 37 #define IO_MEM_BAR 1 38 39 #define DEFAULT_ADDEND 0xA0000000 40 #define TICKS_NS_SHIFT 5 41 #define N_EXT_TS 2 42 43 enum pch_status { 44 PCH_SUCCESS, 45 PCH_INVALIDPARAM, 46 PCH_NOTIMESTAMP, 47 PCH_INTERRUPTMODEINUSE, 48 PCH_FAILED, 49 PCH_UNSUPPORTED, 50 }; 51 /** 52 * struct pch_ts_regs - IEEE 1588 registers 53 */ 54 struct pch_ts_regs { 55 u32 control; 56 u32 event; 57 u32 addend; 58 u32 accum; 59 u32 test; 60 u32 ts_compare; 61 u32 rsystime_lo; 62 u32 rsystime_hi; 63 u32 systime_lo; 64 u32 systime_hi; 65 u32 trgt_lo; 66 u32 trgt_hi; 67 u32 asms_lo; 68 u32 asms_hi; 69 u32 amms_lo; 70 u32 amms_hi; 71 u32 ch_control; 72 u32 ch_event; 73 u32 tx_snap_lo; 74 u32 tx_snap_hi; 75 u32 rx_snap_lo; 76 u32 rx_snap_hi; 77 u32 src_uuid_lo; 78 u32 src_uuid_hi; 79 u32 can_status; 80 u32 can_snap_lo; 81 u32 can_snap_hi; 82 u32 ts_sel; 83 u32 ts_st[6]; 84 u32 reserve1[14]; 85 u32 stl_max_set_en; 86 u32 stl_max_set; 87 u32 reserve2[13]; 88 u32 srst; 89 }; 90 91 #define PCH_TSC_RESET (1 << 0) 92 #define PCH_TSC_TTM_MASK (1 << 1) 93 #define PCH_TSC_ASMS_MASK (1 << 2) 94 #define PCH_TSC_AMMS_MASK (1 << 3) 95 #define PCH_TSC_PPSM_MASK (1 << 4) 96 #define PCH_TSE_TTIPEND (1 << 1) 97 #define PCH_TSE_SNS (1 << 2) 98 #define PCH_TSE_SNM (1 << 3) 99 #define PCH_TSE_PPS (1 << 4) 100 #define PCH_CC_MM (1 << 0) 101 #define PCH_CC_TA (1 << 1) 102 103 #define PCH_CC_MODE_SHIFT 16 104 #define PCH_CC_MODE_MASK 0x001F0000 105 #define PCH_CC_VERSION (1 << 31) 106 #define PCH_CE_TXS (1 << 0) 107 #define PCH_CE_RXS (1 << 1) 108 #define PCH_CE_OVR (1 << 0) 109 #define PCH_CE_VAL (1 << 1) 110 #define PCH_ECS_ETH (1 << 0) 111 112 #define PCH_ECS_CAN (1 << 1) 113 #define PCH_STATION_BYTES 6 114 115 #define PCH_IEEE1588_ETH (1 << 0) 116 #define PCH_IEEE1588_CAN (1 << 1) 117 /** 118 * struct pch_dev - Driver private data 119 */ 120 struct pch_dev { 121 struct pch_ts_regs *regs; 122 struct ptp_clock *ptp_clock; 123 struct ptp_clock_info caps; 124 int exts0_enabled; 125 int exts1_enabled; 126 127 u32 mem_base; 128 u32 mem_size; 129 u32 irq; 130 struct pci_dev *pdev; 131 spinlock_t register_lock; 132 }; 133 134 /** 135 * struct pch_params - 1588 module parameter 136 */ 137 struct pch_params { 138 u8 station[STATION_ADDR_LEN]; 139 }; 140 141 /* structure to hold the module parameters */ 142 static struct pch_params pch_param = { 143 "00:00:00:00:00:00" 144 }; 145 146 /* 147 * Register access functions 148 */ 149 static inline void pch_eth_enable_set(struct pch_dev *chip) 150 { 151 u32 val; 152 /* SET the eth_enable bit */ 153 val = ioread32(&chip->regs->ts_sel) | (PCH_ECS_ETH); 154 iowrite32(val, (&chip->regs->ts_sel)); 155 } 156 157 static u64 pch_systime_read(struct pch_ts_regs *regs) 158 { 159 u64 ns; 160 u32 lo, hi; 161 162 lo = ioread32(®s->systime_lo); 163 hi = ioread32(®s->systime_hi); 164 165 ns = ((u64) hi) << 32; 166 ns |= lo; 167 ns <<= TICKS_NS_SHIFT; 168 169 return ns; 170 } 171 172 static void pch_systime_write(struct pch_ts_regs *regs, u64 ns) 173 { 174 u32 hi, lo; 175 176 ns >>= TICKS_NS_SHIFT; 177 hi = ns >> 32; 178 lo = ns & 0xffffffff; 179 180 iowrite32(lo, ®s->systime_lo); 181 iowrite32(hi, ®s->systime_hi); 182 } 183 184 static inline void pch_block_reset(struct pch_dev *chip) 185 { 186 u32 val; 187 /* Reset Hardware Assist block */ 188 val = ioread32(&chip->regs->control) | PCH_TSC_RESET; 189 iowrite32(val, (&chip->regs->control)); 190 val = val & ~PCH_TSC_RESET; 191 iowrite32(val, (&chip->regs->control)); 192 } 193 194 u32 pch_ch_control_read(struct pci_dev *pdev) 195 { 196 struct pch_dev *chip = pci_get_drvdata(pdev); 197 u32 val; 198 199 val = ioread32(&chip->regs->ch_control); 200 201 return val; 202 } 203 EXPORT_SYMBOL(pch_ch_control_read); 204 205 void pch_ch_control_write(struct pci_dev *pdev, u32 val) 206 { 207 struct pch_dev *chip = pci_get_drvdata(pdev); 208 209 iowrite32(val, (&chip->regs->ch_control)); 210 } 211 EXPORT_SYMBOL(pch_ch_control_write); 212 213 u32 pch_ch_event_read(struct pci_dev *pdev) 214 { 215 struct pch_dev *chip = pci_get_drvdata(pdev); 216 u32 val; 217 218 val = ioread32(&chip->regs->ch_event); 219 220 return val; 221 } 222 EXPORT_SYMBOL(pch_ch_event_read); 223 224 void pch_ch_event_write(struct pci_dev *pdev, u32 val) 225 { 226 struct pch_dev *chip = pci_get_drvdata(pdev); 227 228 iowrite32(val, (&chip->regs->ch_event)); 229 } 230 EXPORT_SYMBOL(pch_ch_event_write); 231 232 u32 pch_src_uuid_lo_read(struct pci_dev *pdev) 233 { 234 struct pch_dev *chip = pci_get_drvdata(pdev); 235 u32 val; 236 237 val = ioread32(&chip->regs->src_uuid_lo); 238 239 return val; 240 } 241 EXPORT_SYMBOL(pch_src_uuid_lo_read); 242 243 u32 pch_src_uuid_hi_read(struct pci_dev *pdev) 244 { 245 struct pch_dev *chip = pci_get_drvdata(pdev); 246 u32 val; 247 248 val = ioread32(&chip->regs->src_uuid_hi); 249 250 return val; 251 } 252 EXPORT_SYMBOL(pch_src_uuid_hi_read); 253 254 u64 pch_rx_snap_read(struct pci_dev *pdev) 255 { 256 struct pch_dev *chip = pci_get_drvdata(pdev); 257 u64 ns; 258 u32 lo, hi; 259 260 lo = ioread32(&chip->regs->rx_snap_lo); 261 hi = ioread32(&chip->regs->rx_snap_hi); 262 263 ns = ((u64) hi) << 32; 264 ns |= lo; 265 266 return ns; 267 } 268 EXPORT_SYMBOL(pch_rx_snap_read); 269 270 u64 pch_tx_snap_read(struct pci_dev *pdev) 271 { 272 struct pch_dev *chip = pci_get_drvdata(pdev); 273 u64 ns; 274 u32 lo, hi; 275 276 lo = ioread32(&chip->regs->tx_snap_lo); 277 hi = ioread32(&chip->regs->tx_snap_hi); 278 279 ns = ((u64) hi) << 32; 280 ns |= lo; 281 282 return ns; 283 } 284 EXPORT_SYMBOL(pch_tx_snap_read); 285 286 /* This function enables all 64 bits in system time registers [high & low]. 287 This is a work-around for non continuous value in the SystemTime Register*/ 288 static void pch_set_system_time_count(struct pch_dev *chip) 289 { 290 iowrite32(0x01, &chip->regs->stl_max_set_en); 291 iowrite32(0xFFFFFFFF, &chip->regs->stl_max_set); 292 iowrite32(0x00, &chip->regs->stl_max_set_en); 293 } 294 295 static void pch_reset(struct pch_dev *chip) 296 { 297 /* Reset Hardware Assist */ 298 pch_block_reset(chip); 299 300 /* enable all 32 bits in system time registers */ 301 pch_set_system_time_count(chip); 302 } 303 304 /** 305 * pch_set_station_address() - This API sets the station address used by 306 * IEEE 1588 hardware when looking at PTP 307 * traffic on the ethernet interface 308 * @addr: dress which contain the column separated address to be used. 309 */ 310 static int pch_set_station_address(u8 *addr, struct pci_dev *pdev) 311 { 312 s32 i; 313 struct pch_dev *chip = pci_get_drvdata(pdev); 314 315 /* Verify the parameter */ 316 if ((chip->regs == 0) || addr == (u8 *)NULL) { 317 dev_err(&pdev->dev, 318 "invalid params returning PCH_INVALIDPARAM\n"); 319 return PCH_INVALIDPARAM; 320 } 321 /* For all station address bytes */ 322 for (i = 0; i < PCH_STATION_BYTES; i++) { 323 u32 val; 324 s32 tmp; 325 326 tmp = hex_to_bin(addr[i * 3]); 327 if (tmp < 0) { 328 dev_err(&pdev->dev, 329 "invalid params returning PCH_INVALIDPARAM\n"); 330 return PCH_INVALIDPARAM; 331 } 332 val = tmp * 16; 333 tmp = hex_to_bin(addr[(i * 3) + 1]); 334 if (tmp < 0) { 335 dev_err(&pdev->dev, 336 "invalid params returning PCH_INVALIDPARAM\n"); 337 return PCH_INVALIDPARAM; 338 } 339 val += tmp; 340 /* Expects ':' separated addresses */ 341 if ((i < 5) && (addr[(i * 3) + 2] != ':')) { 342 dev_err(&pdev->dev, 343 "invalid params returning PCH_INVALIDPARAM\n"); 344 return PCH_INVALIDPARAM; 345 } 346 347 /* Ideally we should set the address only after validating 348 entire string */ 349 dev_dbg(&pdev->dev, "invoking pch_station_set\n"); 350 iowrite32(val, &chip->regs->ts_st[i]); 351 } 352 return 0; 353 } 354 355 /* 356 * Interrupt service routine 357 */ 358 static irqreturn_t isr(int irq, void *priv) 359 { 360 struct pch_dev *pch_dev = priv; 361 struct pch_ts_regs *regs = pch_dev->regs; 362 struct ptp_clock_event event; 363 u32 ack = 0, lo, hi, val; 364 365 val = ioread32(®s->event); 366 367 if (val & PCH_TSE_SNS) { 368 ack |= PCH_TSE_SNS; 369 if (pch_dev->exts0_enabled) { 370 hi = ioread32(®s->asms_hi); 371 lo = ioread32(®s->asms_lo); 372 event.type = PTP_CLOCK_EXTTS; 373 event.index = 0; 374 event.timestamp = ((u64) hi) << 32; 375 event.timestamp |= lo; 376 event.timestamp <<= TICKS_NS_SHIFT; 377 ptp_clock_event(pch_dev->ptp_clock, &event); 378 } 379 } 380 381 if (val & PCH_TSE_SNM) { 382 ack |= PCH_TSE_SNM; 383 if (pch_dev->exts1_enabled) { 384 hi = ioread32(®s->amms_hi); 385 lo = ioread32(®s->amms_lo); 386 event.type = PTP_CLOCK_EXTTS; 387 event.index = 1; 388 event.timestamp = ((u64) hi) << 32; 389 event.timestamp |= lo; 390 event.timestamp <<= TICKS_NS_SHIFT; 391 ptp_clock_event(pch_dev->ptp_clock, &event); 392 } 393 } 394 395 if (val & PCH_TSE_TTIPEND) 396 ack |= PCH_TSE_TTIPEND; /* this bit seems to be always set */ 397 398 if (ack) { 399 iowrite32(ack, ®s->event); 400 return IRQ_HANDLED; 401 } else 402 return IRQ_NONE; 403 } 404 405 /* 406 * PTP clock operations 407 */ 408 409 static int ptp_pch_adjfreq(struct ptp_clock_info *ptp, s32 ppb) 410 { 411 u64 adj; 412 u32 diff, addend; 413 int neg_adj = 0; 414 struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps); 415 struct pch_ts_regs *regs = pch_dev->regs; 416 417 if (ppb < 0) { 418 neg_adj = 1; 419 ppb = -ppb; 420 } 421 addend = DEFAULT_ADDEND; 422 adj = addend; 423 adj *= ppb; 424 diff = div_u64(adj, 1000000000ULL); 425 426 addend = neg_adj ? addend - diff : addend + diff; 427 428 iowrite32(addend, ®s->addend); 429 430 return 0; 431 } 432 433 static int ptp_pch_adjtime(struct ptp_clock_info *ptp, s64 delta) 434 { 435 s64 now; 436 unsigned long flags; 437 struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps); 438 struct pch_ts_regs *regs = pch_dev->regs; 439 440 spin_lock_irqsave(&pch_dev->register_lock, flags); 441 now = pch_systime_read(regs); 442 now += delta; 443 pch_systime_write(regs, now); 444 spin_unlock_irqrestore(&pch_dev->register_lock, flags); 445 446 return 0; 447 } 448 449 static int ptp_pch_gettime(struct ptp_clock_info *ptp, struct timespec *ts) 450 { 451 u64 ns; 452 u32 remainder; 453 unsigned long flags; 454 struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps); 455 struct pch_ts_regs *regs = pch_dev->regs; 456 457 spin_lock_irqsave(&pch_dev->register_lock, flags); 458 ns = pch_systime_read(regs); 459 spin_unlock_irqrestore(&pch_dev->register_lock, flags); 460 461 ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder); 462 ts->tv_nsec = remainder; 463 return 0; 464 } 465 466 static int ptp_pch_settime(struct ptp_clock_info *ptp, 467 const struct timespec *ts) 468 { 469 u64 ns; 470 unsigned long flags; 471 struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps); 472 struct pch_ts_regs *regs = pch_dev->regs; 473 474 ns = ts->tv_sec * 1000000000ULL; 475 ns += ts->tv_nsec; 476 477 spin_lock_irqsave(&pch_dev->register_lock, flags); 478 pch_systime_write(regs, ns); 479 spin_unlock_irqrestore(&pch_dev->register_lock, flags); 480 481 return 0; 482 } 483 484 static int ptp_pch_enable(struct ptp_clock_info *ptp, 485 struct ptp_clock_request *rq, int on) 486 { 487 struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps); 488 489 switch (rq->type) { 490 case PTP_CLK_REQ_EXTTS: 491 switch (rq->extts.index) { 492 case 0: 493 pch_dev->exts0_enabled = on ? 1 : 0; 494 break; 495 case 1: 496 pch_dev->exts1_enabled = on ? 1 : 0; 497 break; 498 default: 499 return -EINVAL; 500 } 501 return 0; 502 default: 503 break; 504 } 505 506 return -EOPNOTSUPP; 507 } 508 509 static struct ptp_clock_info ptp_pch_caps = { 510 .owner = THIS_MODULE, 511 .name = "PCH timer", 512 .max_adj = 50000000, 513 .n_ext_ts = N_EXT_TS, 514 .pps = 0, 515 .adjfreq = ptp_pch_adjfreq, 516 .adjtime = ptp_pch_adjtime, 517 .gettime = ptp_pch_gettime, 518 .settime = ptp_pch_settime, 519 .enable = ptp_pch_enable, 520 }; 521 522 523 #ifdef CONFIG_PM 524 static s32 pch_suspend(struct pci_dev *pdev, pm_message_t state) 525 { 526 pci_disable_device(pdev); 527 pci_enable_wake(pdev, PCI_D3hot, 0); 528 529 if (pci_save_state(pdev) != 0) { 530 dev_err(&pdev->dev, "could not save PCI config state\n"); 531 return -ENOMEM; 532 } 533 pci_set_power_state(pdev, pci_choose_state(pdev, state)); 534 535 return 0; 536 } 537 538 static s32 pch_resume(struct pci_dev *pdev) 539 { 540 s32 ret; 541 542 pci_set_power_state(pdev, PCI_D0); 543 pci_restore_state(pdev); 544 ret = pci_enable_device(pdev); 545 if (ret) { 546 dev_err(&pdev->dev, "pci_enable_device failed\n"); 547 return ret; 548 } 549 pci_enable_wake(pdev, PCI_D3hot, 0); 550 return 0; 551 } 552 #else 553 #define pch_suspend NULL 554 #define pch_resume NULL 555 #endif 556 557 static void __devexit pch_remove(struct pci_dev *pdev) 558 { 559 struct pch_dev *chip = pci_get_drvdata(pdev); 560 561 ptp_clock_unregister(chip->ptp_clock); 562 /* free the interrupt */ 563 if (pdev->irq != 0) 564 free_irq(pdev->irq, chip); 565 566 /* unmap the virtual IO memory space */ 567 if (chip->regs != 0) { 568 iounmap(chip->regs); 569 chip->regs = 0; 570 } 571 /* release the reserved IO memory space */ 572 if (chip->mem_base != 0) { 573 release_mem_region(chip->mem_base, chip->mem_size); 574 chip->mem_base = 0; 575 } 576 pci_disable_device(pdev); 577 kfree(chip); 578 dev_info(&pdev->dev, "complete\n"); 579 } 580 581 static s32 __devinit 582 pch_probe(struct pci_dev *pdev, const struct pci_device_id *id) 583 { 584 s32 ret; 585 unsigned long flags; 586 struct pch_dev *chip; 587 588 chip = kzalloc(sizeof(struct pch_dev), GFP_KERNEL); 589 if (chip == NULL) 590 return -ENOMEM; 591 592 /* enable the 1588 pci device */ 593 ret = pci_enable_device(pdev); 594 if (ret != 0) { 595 dev_err(&pdev->dev, "could not enable the pci device\n"); 596 goto err_pci_en; 597 } 598 599 chip->mem_base = pci_resource_start(pdev, IO_MEM_BAR); 600 if (!chip->mem_base) { 601 dev_err(&pdev->dev, "could not locate IO memory address\n"); 602 ret = -ENODEV; 603 goto err_pci_start; 604 } 605 606 /* retrieve the available length of the IO memory space */ 607 chip->mem_size = pci_resource_len(pdev, IO_MEM_BAR); 608 609 /* allocate the memory for the device registers */ 610 if (!request_mem_region(chip->mem_base, chip->mem_size, "1588_regs")) { 611 dev_err(&pdev->dev, 612 "could not allocate register memory space\n"); 613 ret = -EBUSY; 614 goto err_req_mem_region; 615 } 616 617 /* get the virtual address to the 1588 registers */ 618 chip->regs = ioremap(chip->mem_base, chip->mem_size); 619 620 if (!chip->regs) { 621 dev_err(&pdev->dev, "Could not get virtual address\n"); 622 ret = -ENOMEM; 623 goto err_ioremap; 624 } 625 626 chip->caps = ptp_pch_caps; 627 chip->ptp_clock = ptp_clock_register(&chip->caps); 628 629 if (IS_ERR(chip->ptp_clock)) 630 return PTR_ERR(chip->ptp_clock); 631 632 spin_lock_init(&chip->register_lock); 633 634 ret = request_irq(pdev->irq, &isr, IRQF_SHARED, KBUILD_MODNAME, chip); 635 if (ret != 0) { 636 dev_err(&pdev->dev, "failed to get irq %d\n", pdev->irq); 637 goto err_req_irq; 638 } 639 640 /* indicate success */ 641 chip->irq = pdev->irq; 642 chip->pdev = pdev; 643 pci_set_drvdata(pdev, chip); 644 645 spin_lock_irqsave(&chip->register_lock, flags); 646 /* reset the ieee1588 h/w */ 647 pch_reset(chip); 648 649 iowrite32(DEFAULT_ADDEND, &chip->regs->addend); 650 iowrite32(1, &chip->regs->trgt_lo); 651 iowrite32(0, &chip->regs->trgt_hi); 652 iowrite32(PCH_TSE_TTIPEND, &chip->regs->event); 653 /* Version: IEEE1588 v1 and IEEE1588-2008, Mode: All Evwnt, Locked */ 654 iowrite32(0x80020000, &chip->regs->ch_control); 655 656 pch_eth_enable_set(chip); 657 658 if (strcmp(pch_param.station, "00:00:00:00:00:00") != 0) { 659 if (pch_set_station_address(pch_param.station, pdev) != 0) { 660 dev_err(&pdev->dev, 661 "Invalid station address parameter\n" 662 "Module loaded but station address not set correctly\n" 663 ); 664 } 665 } 666 spin_unlock_irqrestore(&chip->register_lock, flags); 667 return 0; 668 669 err_req_irq: 670 ptp_clock_unregister(chip->ptp_clock); 671 iounmap(chip->regs); 672 chip->regs = 0; 673 674 err_ioremap: 675 release_mem_region(chip->mem_base, chip->mem_size); 676 677 err_req_mem_region: 678 chip->mem_base = 0; 679 680 err_pci_start: 681 pci_disable_device(pdev); 682 683 err_pci_en: 684 kfree(chip); 685 dev_err(&pdev->dev, "probe failed(ret=0x%x)\n", ret); 686 687 return ret; 688 } 689 690 static DEFINE_PCI_DEVICE_TABLE(pch_ieee1588_pcidev_id) = { 691 { 692 .vendor = PCI_VENDOR_ID_INTEL, 693 .device = PCI_DEVICE_ID_PCH_1588 694 }, 695 {0} 696 }; 697 698 static struct pci_driver pch_driver = { 699 .name = KBUILD_MODNAME, 700 .id_table = pch_ieee1588_pcidev_id, 701 .probe = pch_probe, 702 .remove = pch_remove, 703 .suspend = pch_suspend, 704 .resume = pch_resume, 705 }; 706 707 static void __exit ptp_pch_exit(void) 708 { 709 pci_unregister_driver(&pch_driver); 710 } 711 712 static s32 __init ptp_pch_init(void) 713 { 714 s32 ret; 715 716 /* register the driver with the pci core */ 717 ret = pci_register_driver(&pch_driver); 718 719 return ret; 720 } 721 722 module_init(ptp_pch_init); 723 module_exit(ptp_pch_exit); 724 725 module_param_string(station, pch_param.station, sizeof pch_param.station, 0444); 726 MODULE_PARM_DESC(station, 727 "IEEE 1588 station address to use - column separated hex values"); 728 729 MODULE_AUTHOR("LAPIS SEMICONDUCTOR, <tshimizu818@gmail.com>"); 730 MODULE_DESCRIPTION("PTP clock using the EG20T timer"); 731 MODULE_LICENSE("GPL"); 732