1 /* 2 * Telecom Clock driver for Intel NetStructure(tm) MPCBL0010 3 * 4 * Copyright (C) 2005 Kontron Canada 5 * 6 * All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or (at 11 * your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 16 * NON INFRINGEMENT. See the GNU General Public License for more 17 * details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * 23 * Send feedback to <sebastien.bouchard@ca.kontron.com> and the current 24 * Maintainer <mark.gross@intel.com> 25 * 26 * Description : This is the TELECOM CLOCK module driver for the ATCA 27 * MPCBL0010 ATCA computer. 28 */ 29 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/sched.h> 33 #include <linux/kernel.h> /* printk() */ 34 #include <linux/fs.h> /* everything... */ 35 #include <linux/errno.h> /* error codes */ 36 #include <linux/slab.h> 37 #include <linux/ioport.h> 38 #include <linux/interrupt.h> 39 #include <linux/spinlock.h> 40 #include <linux/timer.h> 41 #include <linux/sysfs.h> 42 #include <linux/device.h> 43 #include <linux/miscdevice.h> 44 #include <linux/platform_device.h> 45 #include <asm/io.h> /* inb/outb */ 46 #include <asm/uaccess.h> 47 48 MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>"); 49 MODULE_LICENSE("GPL"); 50 51 /*Hardware Reset of the PLL */ 52 #define RESET_ON 0x00 53 #define RESET_OFF 0x01 54 55 /* MODE SELECT */ 56 #define NORMAL_MODE 0x00 57 #define HOLDOVER_MODE 0x10 58 #define FREERUN_MODE 0x20 59 60 /* FILTER SELECT */ 61 #define FILTER_6HZ 0x04 62 #define FILTER_12HZ 0x00 63 64 /* SELECT REFERENCE FREQUENCY */ 65 #define REF_CLK1_8kHz 0x00 66 #define REF_CLK2_19_44MHz 0x02 67 68 /* Select primary or secondary redundant clock */ 69 #define PRIMARY_CLOCK 0x00 70 #define SECONDARY_CLOCK 0x01 71 72 /* CLOCK TRANSMISSION DEFINE */ 73 #define CLK_8kHz 0xff 74 #define CLK_16_384MHz 0xfb 75 76 #define CLK_1_544MHz 0x00 77 #define CLK_2_048MHz 0x01 78 #define CLK_4_096MHz 0x02 79 #define CLK_6_312MHz 0x03 80 #define CLK_8_192MHz 0x04 81 #define CLK_19_440MHz 0x06 82 83 #define CLK_8_592MHz 0x08 84 #define CLK_11_184MHz 0x09 85 #define CLK_34_368MHz 0x0b 86 #define CLK_44_736MHz 0x0a 87 88 /* RECEIVED REFERENCE */ 89 #define AMC_B1 0 90 #define AMC_B2 1 91 92 /* HARDWARE SWITCHING DEFINE */ 93 #define HW_ENABLE 0x80 94 #define HW_DISABLE 0x00 95 96 /* HARDWARE SWITCHING MODE DEFINE */ 97 #define PLL_HOLDOVER 0x40 98 #define LOST_CLOCK 0x00 99 100 /* ALARMS DEFINE */ 101 #define UNLOCK_MASK 0x10 102 #define HOLDOVER_MASK 0x20 103 #define SEC_LOST_MASK 0x40 104 #define PRI_LOST_MASK 0x80 105 106 /* INTERRUPT CAUSE DEFINE */ 107 108 #define PRI_LOS_01_MASK 0x01 109 #define PRI_LOS_10_MASK 0x02 110 111 #define SEC_LOS_01_MASK 0x04 112 #define SEC_LOS_10_MASK 0x08 113 114 #define HOLDOVER_01_MASK 0x10 115 #define HOLDOVER_10_MASK 0x20 116 117 #define UNLOCK_01_MASK 0x40 118 #define UNLOCK_10_MASK 0x80 119 120 struct tlclk_alarms { 121 __u32 lost_clocks; 122 __u32 lost_primary_clock; 123 __u32 lost_secondary_clock; 124 __u32 primary_clock_back; 125 __u32 secondary_clock_back; 126 __u32 switchover_primary; 127 __u32 switchover_secondary; 128 __u32 pll_holdover; 129 __u32 pll_end_holdover; 130 __u32 pll_lost_sync; 131 __u32 pll_sync; 132 }; 133 /* Telecom clock I/O register definition */ 134 #define TLCLK_BASE 0xa08 135 #define TLCLK_REG0 TLCLK_BASE 136 #define TLCLK_REG1 (TLCLK_BASE+1) 137 #define TLCLK_REG2 (TLCLK_BASE+2) 138 #define TLCLK_REG3 (TLCLK_BASE+3) 139 #define TLCLK_REG4 (TLCLK_BASE+4) 140 #define TLCLK_REG5 (TLCLK_BASE+5) 141 #define TLCLK_REG6 (TLCLK_BASE+6) 142 #define TLCLK_REG7 (TLCLK_BASE+7) 143 144 #define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port) 145 146 /* 0 = Dynamic allocation of the major device number */ 147 #define TLCLK_MAJOR 0 148 149 /* sysfs interface definition: 150 Upon loading the driver will create a sysfs directory under 151 /sys/devices/platform/telco_clock. 152 153 This directory exports the following interfaces. There operation is 154 documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4. 155 alarms : 156 current_ref : 157 received_ref_clk3a : 158 received_ref_clk3b : 159 enable_clk3a_output : 160 enable_clk3b_output : 161 enable_clka0_output : 162 enable_clka1_output : 163 enable_clkb0_output : 164 enable_clkb1_output : 165 filter_select : 166 hardware_switching : 167 hardware_switching_mode : 168 telclock_version : 169 mode_select : 170 refalign : 171 reset : 172 select_amcb1_transmit_clock : 173 select_amcb2_transmit_clock : 174 select_redundant_clock : 175 select_ref_frequency : 176 177 All sysfs interfaces are integers in hex format, i.e echo 99 > refalign 178 has the same effect as echo 0x99 > refalign. 179 */ 180 181 static unsigned int telclk_interrupt; 182 183 static int int_events; /* Event that generate a interrupt */ 184 static int got_event; /* if events processing have been done */ 185 186 static void switchover_timeout(unsigned long data); 187 static struct timer_list switchover_timer = 188 TIMER_INITIALIZER(switchover_timeout , 0, 0); 189 static unsigned long tlclk_timer_data; 190 191 static struct tlclk_alarms *alarm_events; 192 193 static DEFINE_SPINLOCK(event_lock); 194 195 static int tlclk_major = TLCLK_MAJOR; 196 197 static irqreturn_t tlclk_interrupt(int irq, void *dev_id); 198 199 static DECLARE_WAIT_QUEUE_HEAD(wq); 200 201 static unsigned long useflags; 202 static DEFINE_MUTEX(tlclk_mutex); 203 204 static int tlclk_open(struct inode *inode, struct file *filp) 205 { 206 int result; 207 208 if (test_and_set_bit(0, &useflags)) 209 return -EBUSY; 210 /* this legacy device is always one per system and it doesn't 211 * know how to handle multiple concurrent clients. 212 */ 213 214 /* Make sure there is no interrupt pending while 215 * initialising interrupt handler */ 216 inb(TLCLK_REG6); 217 218 /* This device is wired through the FPGA IO space of the ATCA blade 219 * we can't share this IRQ */ 220 result = request_irq(telclk_interrupt, &tlclk_interrupt, 221 IRQF_DISABLED, "telco_clock", tlclk_interrupt); 222 if (result == -EBUSY) { 223 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n"); 224 return -EBUSY; 225 } 226 inb(TLCLK_REG6); /* Clear interrupt events */ 227 228 return 0; 229 } 230 231 static int tlclk_release(struct inode *inode, struct file *filp) 232 { 233 free_irq(telclk_interrupt, tlclk_interrupt); 234 clear_bit(0, &useflags); 235 236 return 0; 237 } 238 239 static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count, 240 loff_t *f_pos) 241 { 242 if (count < sizeof(struct tlclk_alarms)) 243 return -EIO; 244 if (mutex_lock_interruptible(&tlclk_mutex)) 245 return -EINTR; 246 247 248 wait_event_interruptible(wq, got_event); 249 if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms))) { 250 mutex_unlock(&tlclk_mutex); 251 return -EFAULT; 252 } 253 254 memset(alarm_events, 0, sizeof(struct tlclk_alarms)); 255 got_event = 0; 256 257 mutex_unlock(&tlclk_mutex); 258 return sizeof(struct tlclk_alarms); 259 } 260 261 static const struct file_operations tlclk_fops = { 262 .read = tlclk_read, 263 .open = tlclk_open, 264 .release = tlclk_release, 265 266 }; 267 268 static struct miscdevice tlclk_miscdev = { 269 .minor = MISC_DYNAMIC_MINOR, 270 .name = "telco_clock", 271 .fops = &tlclk_fops, 272 }; 273 274 static ssize_t show_current_ref(struct device *d, 275 struct device_attribute *attr, char *buf) 276 { 277 unsigned long ret_val; 278 unsigned long flags; 279 280 spin_lock_irqsave(&event_lock, flags); 281 ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3); 282 spin_unlock_irqrestore(&event_lock, flags); 283 284 return sprintf(buf, "0x%lX\n", ret_val); 285 } 286 287 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL); 288 289 290 static ssize_t show_telclock_version(struct device *d, 291 struct device_attribute *attr, char *buf) 292 { 293 unsigned long ret_val; 294 unsigned long flags; 295 296 spin_lock_irqsave(&event_lock, flags); 297 ret_val = inb(TLCLK_REG5); 298 spin_unlock_irqrestore(&event_lock, flags); 299 300 return sprintf(buf, "0x%lX\n", ret_val); 301 } 302 303 static DEVICE_ATTR(telclock_version, S_IRUGO, 304 show_telclock_version, NULL); 305 306 static ssize_t show_alarms(struct device *d, 307 struct device_attribute *attr, char *buf) 308 { 309 unsigned long ret_val; 310 unsigned long flags; 311 312 spin_lock_irqsave(&event_lock, flags); 313 ret_val = (inb(TLCLK_REG2) & 0xf0); 314 spin_unlock_irqrestore(&event_lock, flags); 315 316 return sprintf(buf, "0x%lX\n", ret_val); 317 } 318 319 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 320 321 static ssize_t store_received_ref_clk3a(struct device *d, 322 struct device_attribute *attr, const char *buf, size_t count) 323 { 324 unsigned long tmp; 325 unsigned char val; 326 unsigned long flags; 327 328 sscanf(buf, "%lX", &tmp); 329 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 330 331 val = (unsigned char)tmp; 332 spin_lock_irqsave(&event_lock, flags); 333 SET_PORT_BITS(TLCLK_REG1, 0xef, val); 334 spin_unlock_irqrestore(&event_lock, flags); 335 336 return strnlen(buf, count); 337 } 338 339 static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL, 340 store_received_ref_clk3a); 341 342 343 static ssize_t store_received_ref_clk3b(struct device *d, 344 struct device_attribute *attr, const char *buf, size_t count) 345 { 346 unsigned long tmp; 347 unsigned char val; 348 unsigned long flags; 349 350 sscanf(buf, "%lX", &tmp); 351 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 352 353 val = (unsigned char)tmp; 354 spin_lock_irqsave(&event_lock, flags); 355 SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1); 356 spin_unlock_irqrestore(&event_lock, flags); 357 358 return strnlen(buf, count); 359 } 360 361 static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL, 362 store_received_ref_clk3b); 363 364 365 static ssize_t store_enable_clk3b_output(struct device *d, 366 struct device_attribute *attr, const char *buf, size_t count) 367 { 368 unsigned long tmp; 369 unsigned char val; 370 unsigned long flags; 371 372 sscanf(buf, "%lX", &tmp); 373 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 374 375 val = (unsigned char)tmp; 376 spin_lock_irqsave(&event_lock, flags); 377 SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7); 378 spin_unlock_irqrestore(&event_lock, flags); 379 380 return strnlen(buf, count); 381 } 382 383 static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL, 384 store_enable_clk3b_output); 385 386 static ssize_t store_enable_clk3a_output(struct device *d, 387 struct device_attribute *attr, const char *buf, size_t count) 388 { 389 unsigned long flags; 390 unsigned long tmp; 391 unsigned char val; 392 393 sscanf(buf, "%lX", &tmp); 394 dev_dbg(d, "tmp = 0x%lX\n", tmp); 395 396 val = (unsigned char)tmp; 397 spin_lock_irqsave(&event_lock, flags); 398 SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6); 399 spin_unlock_irqrestore(&event_lock, flags); 400 401 return strnlen(buf, count); 402 } 403 404 static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL, 405 store_enable_clk3a_output); 406 407 static ssize_t store_enable_clkb1_output(struct device *d, 408 struct device_attribute *attr, const char *buf, size_t count) 409 { 410 unsigned long flags; 411 unsigned long tmp; 412 unsigned char val; 413 414 sscanf(buf, "%lX", &tmp); 415 dev_dbg(d, "tmp = 0x%lX\n", tmp); 416 417 val = (unsigned char)tmp; 418 spin_lock_irqsave(&event_lock, flags); 419 SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3); 420 spin_unlock_irqrestore(&event_lock, flags); 421 422 return strnlen(buf, count); 423 } 424 425 static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL, 426 store_enable_clkb1_output); 427 428 429 static ssize_t store_enable_clka1_output(struct device *d, 430 struct device_attribute *attr, const char *buf, size_t count) 431 { 432 unsigned long flags; 433 unsigned long tmp; 434 unsigned char val; 435 436 sscanf(buf, "%lX", &tmp); 437 dev_dbg(d, "tmp = 0x%lX\n", tmp); 438 439 val = (unsigned char)tmp; 440 spin_lock_irqsave(&event_lock, flags); 441 SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2); 442 spin_unlock_irqrestore(&event_lock, flags); 443 444 return strnlen(buf, count); 445 } 446 447 static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL, 448 store_enable_clka1_output); 449 450 static ssize_t store_enable_clkb0_output(struct device *d, 451 struct device_attribute *attr, const char *buf, size_t count) 452 { 453 unsigned long flags; 454 unsigned long tmp; 455 unsigned char val; 456 457 sscanf(buf, "%lX", &tmp); 458 dev_dbg(d, "tmp = 0x%lX\n", tmp); 459 460 val = (unsigned char)tmp; 461 spin_lock_irqsave(&event_lock, flags); 462 SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1); 463 spin_unlock_irqrestore(&event_lock, flags); 464 465 return strnlen(buf, count); 466 } 467 468 static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL, 469 store_enable_clkb0_output); 470 471 static ssize_t store_enable_clka0_output(struct device *d, 472 struct device_attribute *attr, const char *buf, size_t count) 473 { 474 unsigned long flags; 475 unsigned long tmp; 476 unsigned char val; 477 478 sscanf(buf, "%lX", &tmp); 479 dev_dbg(d, "tmp = 0x%lX\n", tmp); 480 481 val = (unsigned char)tmp; 482 spin_lock_irqsave(&event_lock, flags); 483 SET_PORT_BITS(TLCLK_REG2, 0xfe, val); 484 spin_unlock_irqrestore(&event_lock, flags); 485 486 return strnlen(buf, count); 487 } 488 489 static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL, 490 store_enable_clka0_output); 491 492 static ssize_t store_select_amcb2_transmit_clock(struct device *d, 493 struct device_attribute *attr, const char *buf, size_t count) 494 { 495 unsigned long flags; 496 unsigned long tmp; 497 unsigned char val; 498 499 sscanf(buf, "%lX", &tmp); 500 dev_dbg(d, "tmp = 0x%lX\n", tmp); 501 502 val = (unsigned char)tmp; 503 spin_lock_irqsave(&event_lock, flags); 504 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) { 505 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28); 506 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val); 507 } else if (val >= CLK_8_592MHz) { 508 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38); 509 switch (val) { 510 case CLK_8_592MHz: 511 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2); 512 break; 513 case CLK_11_184MHz: 514 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0); 515 break; 516 case CLK_34_368MHz: 517 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3); 518 break; 519 case CLK_44_736MHz: 520 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1); 521 break; 522 } 523 } else 524 SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3); 525 526 spin_unlock_irqrestore(&event_lock, flags); 527 528 return strnlen(buf, count); 529 } 530 531 static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL, 532 store_select_amcb2_transmit_clock); 533 534 static ssize_t store_select_amcb1_transmit_clock(struct device *d, 535 struct device_attribute *attr, const char *buf, size_t count) 536 { 537 unsigned long tmp; 538 unsigned char val; 539 unsigned long flags; 540 541 sscanf(buf, "%lX", &tmp); 542 dev_dbg(d, "tmp = 0x%lX\n", tmp); 543 544 val = (unsigned char)tmp; 545 spin_lock_irqsave(&event_lock, flags); 546 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) { 547 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5); 548 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val); 549 } else if (val >= CLK_8_592MHz) { 550 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7); 551 switch (val) { 552 case CLK_8_592MHz: 553 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2); 554 break; 555 case CLK_11_184MHz: 556 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0); 557 break; 558 case CLK_34_368MHz: 559 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3); 560 break; 561 case CLK_44_736MHz: 562 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1); 563 break; 564 } 565 } else 566 SET_PORT_BITS(TLCLK_REG3, 0xf8, val); 567 spin_unlock_irqrestore(&event_lock, flags); 568 569 return strnlen(buf, count); 570 } 571 572 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL, 573 store_select_amcb1_transmit_clock); 574 575 static ssize_t store_select_redundant_clock(struct device *d, 576 struct device_attribute *attr, const char *buf, size_t count) 577 { 578 unsigned long tmp; 579 unsigned char val; 580 unsigned long flags; 581 582 sscanf(buf, "%lX", &tmp); 583 dev_dbg(d, "tmp = 0x%lX\n", tmp); 584 585 val = (unsigned char)tmp; 586 spin_lock_irqsave(&event_lock, flags); 587 SET_PORT_BITS(TLCLK_REG1, 0xfe, val); 588 spin_unlock_irqrestore(&event_lock, flags); 589 590 return strnlen(buf, count); 591 } 592 593 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL, 594 store_select_redundant_clock); 595 596 static ssize_t store_select_ref_frequency(struct device *d, 597 struct device_attribute *attr, const char *buf, size_t count) 598 { 599 unsigned long tmp; 600 unsigned char val; 601 unsigned long flags; 602 603 sscanf(buf, "%lX", &tmp); 604 dev_dbg(d, "tmp = 0x%lX\n", tmp); 605 606 val = (unsigned char)tmp; 607 spin_lock_irqsave(&event_lock, flags); 608 SET_PORT_BITS(TLCLK_REG1, 0xfd, val); 609 spin_unlock_irqrestore(&event_lock, flags); 610 611 return strnlen(buf, count); 612 } 613 614 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL, 615 store_select_ref_frequency); 616 617 static ssize_t store_filter_select(struct device *d, 618 struct device_attribute *attr, const char *buf, size_t count) 619 { 620 unsigned long tmp; 621 unsigned char val; 622 unsigned long flags; 623 624 sscanf(buf, "%lX", &tmp); 625 dev_dbg(d, "tmp = 0x%lX\n", tmp); 626 627 val = (unsigned char)tmp; 628 spin_lock_irqsave(&event_lock, flags); 629 SET_PORT_BITS(TLCLK_REG0, 0xfb, val); 630 spin_unlock_irqrestore(&event_lock, flags); 631 632 return strnlen(buf, count); 633 } 634 635 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select); 636 637 static ssize_t store_hardware_switching_mode(struct device *d, 638 struct device_attribute *attr, const char *buf, size_t count) 639 { 640 unsigned long tmp; 641 unsigned char val; 642 unsigned long flags; 643 644 sscanf(buf, "%lX", &tmp); 645 dev_dbg(d, "tmp = 0x%lX\n", tmp); 646 647 val = (unsigned char)tmp; 648 spin_lock_irqsave(&event_lock, flags); 649 SET_PORT_BITS(TLCLK_REG0, 0xbf, val); 650 spin_unlock_irqrestore(&event_lock, flags); 651 652 return strnlen(buf, count); 653 } 654 655 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL, 656 store_hardware_switching_mode); 657 658 static ssize_t store_hardware_switching(struct device *d, 659 struct device_attribute *attr, const char *buf, size_t count) 660 { 661 unsigned long tmp; 662 unsigned char val; 663 unsigned long flags; 664 665 sscanf(buf, "%lX", &tmp); 666 dev_dbg(d, "tmp = 0x%lX\n", tmp); 667 668 val = (unsigned char)tmp; 669 spin_lock_irqsave(&event_lock, flags); 670 SET_PORT_BITS(TLCLK_REG0, 0x7f, val); 671 spin_unlock_irqrestore(&event_lock, flags); 672 673 return strnlen(buf, count); 674 } 675 676 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL, 677 store_hardware_switching); 678 679 static ssize_t store_refalign (struct device *d, 680 struct device_attribute *attr, const char *buf, size_t count) 681 { 682 unsigned long tmp; 683 unsigned long flags; 684 685 sscanf(buf, "%lX", &tmp); 686 dev_dbg(d, "tmp = 0x%lX\n", tmp); 687 spin_lock_irqsave(&event_lock, flags); 688 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0); 689 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08); 690 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0); 691 spin_unlock_irqrestore(&event_lock, flags); 692 693 return strnlen(buf, count); 694 } 695 696 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign); 697 698 static ssize_t store_mode_select (struct device *d, 699 struct device_attribute *attr, const char *buf, size_t count) 700 { 701 unsigned long tmp; 702 unsigned char val; 703 unsigned long flags; 704 705 sscanf(buf, "%lX", &tmp); 706 dev_dbg(d, "tmp = 0x%lX\n", tmp); 707 708 val = (unsigned char)tmp; 709 spin_lock_irqsave(&event_lock, flags); 710 SET_PORT_BITS(TLCLK_REG0, 0xcf, val); 711 spin_unlock_irqrestore(&event_lock, flags); 712 713 return strnlen(buf, count); 714 } 715 716 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select); 717 718 static ssize_t store_reset (struct device *d, 719 struct device_attribute *attr, const char *buf, size_t count) 720 { 721 unsigned long tmp; 722 unsigned char val; 723 unsigned long flags; 724 725 sscanf(buf, "%lX", &tmp); 726 dev_dbg(d, "tmp = 0x%lX\n", tmp); 727 728 val = (unsigned char)tmp; 729 spin_lock_irqsave(&event_lock, flags); 730 SET_PORT_BITS(TLCLK_REG4, 0xfd, val); 731 spin_unlock_irqrestore(&event_lock, flags); 732 733 return strnlen(buf, count); 734 } 735 736 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset); 737 738 static struct attribute *tlclk_sysfs_entries[] = { 739 &dev_attr_current_ref.attr, 740 &dev_attr_telclock_version.attr, 741 &dev_attr_alarms.attr, 742 &dev_attr_received_ref_clk3a.attr, 743 &dev_attr_received_ref_clk3b.attr, 744 &dev_attr_enable_clk3a_output.attr, 745 &dev_attr_enable_clk3b_output.attr, 746 &dev_attr_enable_clkb1_output.attr, 747 &dev_attr_enable_clka1_output.attr, 748 &dev_attr_enable_clkb0_output.attr, 749 &dev_attr_enable_clka0_output.attr, 750 &dev_attr_select_amcb1_transmit_clock.attr, 751 &dev_attr_select_amcb2_transmit_clock.attr, 752 &dev_attr_select_redundant_clock.attr, 753 &dev_attr_select_ref_frequency.attr, 754 &dev_attr_filter_select.attr, 755 &dev_attr_hardware_switching_mode.attr, 756 &dev_attr_hardware_switching.attr, 757 &dev_attr_refalign.attr, 758 &dev_attr_mode_select.attr, 759 &dev_attr_reset.attr, 760 NULL 761 }; 762 763 static struct attribute_group tlclk_attribute_group = { 764 .name = NULL, /* put in device directory */ 765 .attrs = tlclk_sysfs_entries, 766 }; 767 768 static struct platform_device *tlclk_device; 769 770 static int __init tlclk_init(void) 771 { 772 int ret; 773 774 ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops); 775 if (ret < 0) { 776 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major); 777 return ret; 778 } 779 tlclk_major = ret; 780 alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL); 781 if (!alarm_events) 782 goto out1; 783 784 /* Read telecom clock IRQ number (Set by BIOS) */ 785 if (!request_region(TLCLK_BASE, 8, "telco_clock")) { 786 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n", 787 TLCLK_BASE); 788 ret = -EBUSY; 789 goto out2; 790 } 791 telclk_interrupt = (inb(TLCLK_REG7) & 0x0f); 792 793 if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */ 794 printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n", 795 telclk_interrupt); 796 ret = -ENXIO; 797 goto out3; 798 } 799 800 init_timer(&switchover_timer); 801 802 ret = misc_register(&tlclk_miscdev); 803 if (ret < 0) { 804 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret); 805 goto out3; 806 } 807 808 tlclk_device = platform_device_register_simple("telco_clock", 809 -1, NULL, 0); 810 if (IS_ERR(tlclk_device)) { 811 printk(KERN_ERR "tlclk: platform_device_register failed.\n"); 812 ret = PTR_ERR(tlclk_device); 813 goto out4; 814 } 815 816 ret = sysfs_create_group(&tlclk_device->dev.kobj, 817 &tlclk_attribute_group); 818 if (ret) { 819 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n"); 820 goto out5; 821 } 822 823 return 0; 824 out5: 825 platform_device_unregister(tlclk_device); 826 out4: 827 misc_deregister(&tlclk_miscdev); 828 out3: 829 release_region(TLCLK_BASE, 8); 830 out2: 831 kfree(alarm_events); 832 out1: 833 unregister_chrdev(tlclk_major, "telco_clock"); 834 return ret; 835 } 836 837 static void __exit tlclk_cleanup(void) 838 { 839 sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group); 840 platform_device_unregister(tlclk_device); 841 misc_deregister(&tlclk_miscdev); 842 unregister_chrdev(tlclk_major, "telco_clock"); 843 844 release_region(TLCLK_BASE, 8); 845 del_timer_sync(&switchover_timer); 846 kfree(alarm_events); 847 848 } 849 850 static void switchover_timeout(unsigned long data) 851 { 852 unsigned long flags = *(unsigned long *) data; 853 854 if ((flags & 1)) { 855 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08)) 856 alarm_events->switchover_primary++; 857 } else { 858 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08)) 859 alarm_events->switchover_secondary++; 860 } 861 862 /* Alarm processing is done, wake up read task */ 863 del_timer(&switchover_timer); 864 got_event = 1; 865 wake_up(&wq); 866 } 867 868 static irqreturn_t tlclk_interrupt(int irq, void *dev_id) 869 { 870 unsigned long flags; 871 872 spin_lock_irqsave(&event_lock, flags); 873 /* Read and clear interrupt events */ 874 int_events = inb(TLCLK_REG6); 875 876 /* Primary_Los changed from 0 to 1 ? */ 877 if (int_events & PRI_LOS_01_MASK) { 878 if (inb(TLCLK_REG2) & SEC_LOST_MASK) 879 alarm_events->lost_clocks++; 880 else 881 alarm_events->lost_primary_clock++; 882 } 883 884 /* Primary_Los changed from 1 to 0 ? */ 885 if (int_events & PRI_LOS_10_MASK) { 886 alarm_events->primary_clock_back++; 887 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1); 888 } 889 /* Secondary_Los changed from 0 to 1 ? */ 890 if (int_events & SEC_LOS_01_MASK) { 891 if (inb(TLCLK_REG2) & PRI_LOST_MASK) 892 alarm_events->lost_clocks++; 893 else 894 alarm_events->lost_secondary_clock++; 895 } 896 /* Secondary_Los changed from 1 to 0 ? */ 897 if (int_events & SEC_LOS_10_MASK) { 898 alarm_events->secondary_clock_back++; 899 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0); 900 } 901 if (int_events & HOLDOVER_10_MASK) 902 alarm_events->pll_end_holdover++; 903 904 if (int_events & UNLOCK_01_MASK) 905 alarm_events->pll_lost_sync++; 906 907 if (int_events & UNLOCK_10_MASK) 908 alarm_events->pll_sync++; 909 910 /* Holdover changed from 0 to 1 ? */ 911 if (int_events & HOLDOVER_01_MASK) { 912 alarm_events->pll_holdover++; 913 914 /* TIMEOUT in ~10ms */ 915 switchover_timer.expires = jiffies + msecs_to_jiffies(10); 916 tlclk_timer_data = inb(TLCLK_REG1); 917 switchover_timer.data = (unsigned long) &tlclk_timer_data; 918 mod_timer(&switchover_timer, switchover_timer.expires); 919 } else { 920 got_event = 1; 921 wake_up(&wq); 922 } 923 spin_unlock_irqrestore(&event_lock, flags); 924 925 return IRQ_HANDLED; 926 } 927 928 module_init(tlclk_init); 929 module_exit(tlclk_cleanup); 930