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/kernel.h> /* printk() */ 33 #include <linux/fs.h> /* everything... */ 34 #include <linux/errno.h> /* error codes */ 35 #include <linux/sched.h> 36 #include <linux/slab.h> 37 #include <linux/ioport.h> 38 #include <linux/interrupt.h> 39 #include <linux/spinlock.h> 40 #include <linux/mutex.h> 41 #include <linux/timer.h> 42 #include <linux/sysfs.h> 43 #include <linux/device.h> 44 #include <linux/miscdevice.h> 45 #include <linux/platform_device.h> 46 #include <asm/io.h> /* inb/outb */ 47 #include <linux/uaccess.h> 48 49 MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>"); 50 MODULE_LICENSE("GPL"); 51 52 /*Hardware Reset of the PLL */ 53 #define RESET_ON 0x00 54 #define RESET_OFF 0x01 55 56 /* MODE SELECT */ 57 #define NORMAL_MODE 0x00 58 #define HOLDOVER_MODE 0x10 59 #define FREERUN_MODE 0x20 60 61 /* FILTER SELECT */ 62 #define FILTER_6HZ 0x04 63 #define FILTER_12HZ 0x00 64 65 /* SELECT REFERENCE FREQUENCY */ 66 #define REF_CLK1_8kHz 0x00 67 #define REF_CLK2_19_44MHz 0x02 68 69 /* Select primary or secondary redundant clock */ 70 #define PRIMARY_CLOCK 0x00 71 #define SECONDARY_CLOCK 0x01 72 73 /* CLOCK TRANSMISSION DEFINE */ 74 #define CLK_8kHz 0xff 75 #define CLK_16_384MHz 0xfb 76 77 #define CLK_1_544MHz 0x00 78 #define CLK_2_048MHz 0x01 79 #define CLK_4_096MHz 0x02 80 #define CLK_6_312MHz 0x03 81 #define CLK_8_192MHz 0x04 82 #define CLK_19_440MHz 0x06 83 84 #define CLK_8_592MHz 0x08 85 #define CLK_11_184MHz 0x09 86 #define CLK_34_368MHz 0x0b 87 #define CLK_44_736MHz 0x0a 88 89 /* RECEIVED REFERENCE */ 90 #define AMC_B1 0 91 #define AMC_B2 1 92 93 /* HARDWARE SWITCHING DEFINE */ 94 #define HW_ENABLE 0x80 95 #define HW_DISABLE 0x00 96 97 /* HARDWARE SWITCHING MODE DEFINE */ 98 #define PLL_HOLDOVER 0x40 99 #define LOST_CLOCK 0x00 100 101 /* ALARMS DEFINE */ 102 #define UNLOCK_MASK 0x10 103 #define HOLDOVER_MASK 0x20 104 #define SEC_LOST_MASK 0x40 105 #define PRI_LOST_MASK 0x80 106 107 /* INTERRUPT CAUSE DEFINE */ 108 109 #define PRI_LOS_01_MASK 0x01 110 #define PRI_LOS_10_MASK 0x02 111 112 #define SEC_LOS_01_MASK 0x04 113 #define SEC_LOS_10_MASK 0x08 114 115 #define HOLDOVER_01_MASK 0x10 116 #define HOLDOVER_10_MASK 0x20 117 118 #define UNLOCK_01_MASK 0x40 119 #define UNLOCK_10_MASK 0x80 120 121 struct tlclk_alarms { 122 __u32 lost_clocks; 123 __u32 lost_primary_clock; 124 __u32 lost_secondary_clock; 125 __u32 primary_clock_back; 126 __u32 secondary_clock_back; 127 __u32 switchover_primary; 128 __u32 switchover_secondary; 129 __u32 pll_holdover; 130 __u32 pll_end_holdover; 131 __u32 pll_lost_sync; 132 __u32 pll_sync; 133 }; 134 /* Telecom clock I/O register definition */ 135 #define TLCLK_BASE 0xa08 136 #define TLCLK_REG0 TLCLK_BASE 137 #define TLCLK_REG1 (TLCLK_BASE+1) 138 #define TLCLK_REG2 (TLCLK_BASE+2) 139 #define TLCLK_REG3 (TLCLK_BASE+3) 140 #define TLCLK_REG4 (TLCLK_BASE+4) 141 #define TLCLK_REG5 (TLCLK_BASE+5) 142 #define TLCLK_REG6 (TLCLK_BASE+6) 143 #define TLCLK_REG7 (TLCLK_BASE+7) 144 145 #define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port) 146 147 /* 0 = Dynamic allocation of the major device number */ 148 #define TLCLK_MAJOR 0 149 150 /* sysfs interface definition: 151 Upon loading the driver will create a sysfs directory under 152 /sys/devices/platform/telco_clock. 153 154 This directory exports the following interfaces. There operation is 155 documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4. 156 alarms : 157 current_ref : 158 received_ref_clk3a : 159 received_ref_clk3b : 160 enable_clk3a_output : 161 enable_clk3b_output : 162 enable_clka0_output : 163 enable_clka1_output : 164 enable_clkb0_output : 165 enable_clkb1_output : 166 filter_select : 167 hardware_switching : 168 hardware_switching_mode : 169 telclock_version : 170 mode_select : 171 refalign : 172 reset : 173 select_amcb1_transmit_clock : 174 select_amcb2_transmit_clock : 175 select_redundant_clock : 176 select_ref_frequency : 177 178 All sysfs interfaces are integers in hex format, i.e echo 99 > refalign 179 has the same effect as echo 0x99 > refalign. 180 */ 181 182 static unsigned int telclk_interrupt; 183 184 static int int_events; /* Event that generate a interrupt */ 185 static int got_event; /* if events processing have been done */ 186 187 static void switchover_timeout(struct timer_list *t); 188 static struct timer_list switchover_timer; 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 tlclk_open(struct inode * inode,struct file * filp)204 static int tlclk_open(struct inode *inode, struct file *filp) 205 { 206 int result; 207 208 mutex_lock(&tlclk_mutex); 209 if (test_and_set_bit(0, &useflags)) { 210 result = -EBUSY; 211 /* this legacy device is always one per system and it doesn't 212 * know how to handle multiple concurrent clients. 213 */ 214 goto out; 215 } 216 217 /* Make sure there is no interrupt pending while 218 * initialising interrupt handler */ 219 inb(TLCLK_REG6); 220 221 /* This device is wired through the FPGA IO space of the ATCA blade 222 * we can't share this IRQ */ 223 result = request_irq(telclk_interrupt, &tlclk_interrupt, 224 0, "telco_clock", tlclk_interrupt); 225 if (result == -EBUSY) 226 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n"); 227 else 228 inb(TLCLK_REG6); /* Clear interrupt events */ 229 230 out: 231 mutex_unlock(&tlclk_mutex); 232 return result; 233 } 234 tlclk_release(struct inode * inode,struct file * filp)235 static int tlclk_release(struct inode *inode, struct file *filp) 236 { 237 free_irq(telclk_interrupt, tlclk_interrupt); 238 clear_bit(0, &useflags); 239 240 return 0; 241 } 242 tlclk_read(struct file * filp,char __user * buf,size_t count,loff_t * f_pos)243 static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count, 244 loff_t *f_pos) 245 { 246 if (count < sizeof(struct tlclk_alarms)) 247 return -EIO; 248 if (mutex_lock_interruptible(&tlclk_mutex)) 249 return -EINTR; 250 251 252 wait_event_interruptible(wq, got_event); 253 if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms))) { 254 mutex_unlock(&tlclk_mutex); 255 return -EFAULT; 256 } 257 258 memset(alarm_events, 0, sizeof(struct tlclk_alarms)); 259 got_event = 0; 260 261 mutex_unlock(&tlclk_mutex); 262 return sizeof(struct tlclk_alarms); 263 } 264 265 static const struct file_operations tlclk_fops = { 266 .read = tlclk_read, 267 .open = tlclk_open, 268 .release = tlclk_release, 269 .llseek = noop_llseek, 270 271 }; 272 273 static struct miscdevice tlclk_miscdev = { 274 .minor = MISC_DYNAMIC_MINOR, 275 .name = "telco_clock", 276 .fops = &tlclk_fops, 277 }; 278 show_current_ref(struct device * d,struct device_attribute * attr,char * buf)279 static ssize_t show_current_ref(struct device *d, 280 struct device_attribute *attr, char *buf) 281 { 282 unsigned long ret_val; 283 unsigned long flags; 284 285 spin_lock_irqsave(&event_lock, flags); 286 ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3); 287 spin_unlock_irqrestore(&event_lock, flags); 288 289 return sprintf(buf, "0x%lX\n", ret_val); 290 } 291 292 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL); 293 294 show_telclock_version(struct device * d,struct device_attribute * attr,char * buf)295 static ssize_t show_telclock_version(struct device *d, 296 struct device_attribute *attr, char *buf) 297 { 298 unsigned long ret_val; 299 unsigned long flags; 300 301 spin_lock_irqsave(&event_lock, flags); 302 ret_val = inb(TLCLK_REG5); 303 spin_unlock_irqrestore(&event_lock, flags); 304 305 return sprintf(buf, "0x%lX\n", ret_val); 306 } 307 308 static DEVICE_ATTR(telclock_version, S_IRUGO, 309 show_telclock_version, NULL); 310 show_alarms(struct device * d,struct device_attribute * attr,char * buf)311 static ssize_t show_alarms(struct device *d, 312 struct device_attribute *attr, char *buf) 313 { 314 unsigned long ret_val; 315 unsigned long flags; 316 317 spin_lock_irqsave(&event_lock, flags); 318 ret_val = (inb(TLCLK_REG2) & 0xf0); 319 spin_unlock_irqrestore(&event_lock, flags); 320 321 return sprintf(buf, "0x%lX\n", ret_val); 322 } 323 324 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 325 store_received_ref_clk3a(struct device * d,struct device_attribute * attr,const char * buf,size_t count)326 static ssize_t store_received_ref_clk3a(struct device *d, 327 struct device_attribute *attr, const char *buf, size_t count) 328 { 329 unsigned long tmp; 330 unsigned char val; 331 unsigned long flags; 332 333 sscanf(buf, "%lX", &tmp); 334 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 335 336 val = (unsigned char)tmp; 337 spin_lock_irqsave(&event_lock, flags); 338 SET_PORT_BITS(TLCLK_REG1, 0xef, val); 339 spin_unlock_irqrestore(&event_lock, flags); 340 341 return strnlen(buf, count); 342 } 343 344 static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL, 345 store_received_ref_clk3a); 346 347 store_received_ref_clk3b(struct device * d,struct device_attribute * attr,const char * buf,size_t count)348 static ssize_t store_received_ref_clk3b(struct device *d, 349 struct device_attribute *attr, const char *buf, size_t count) 350 { 351 unsigned long tmp; 352 unsigned char val; 353 unsigned long flags; 354 355 sscanf(buf, "%lX", &tmp); 356 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 357 358 val = (unsigned char)tmp; 359 spin_lock_irqsave(&event_lock, flags); 360 SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1); 361 spin_unlock_irqrestore(&event_lock, flags); 362 363 return strnlen(buf, count); 364 } 365 366 static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL, 367 store_received_ref_clk3b); 368 369 store_enable_clk3b_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)370 static ssize_t store_enable_clk3b_output(struct device *d, 371 struct device_attribute *attr, const char *buf, size_t count) 372 { 373 unsigned long tmp; 374 unsigned char val; 375 unsigned long flags; 376 377 sscanf(buf, "%lX", &tmp); 378 dev_dbg(d, ": tmp = 0x%lX\n", tmp); 379 380 val = (unsigned char)tmp; 381 spin_lock_irqsave(&event_lock, flags); 382 SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7); 383 spin_unlock_irqrestore(&event_lock, flags); 384 385 return strnlen(buf, count); 386 } 387 388 static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL, 389 store_enable_clk3b_output); 390 store_enable_clk3a_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)391 static ssize_t store_enable_clk3a_output(struct device *d, 392 struct device_attribute *attr, const char *buf, size_t count) 393 { 394 unsigned long flags; 395 unsigned long tmp; 396 unsigned char val; 397 398 sscanf(buf, "%lX", &tmp); 399 dev_dbg(d, "tmp = 0x%lX\n", tmp); 400 401 val = (unsigned char)tmp; 402 spin_lock_irqsave(&event_lock, flags); 403 SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6); 404 spin_unlock_irqrestore(&event_lock, flags); 405 406 return strnlen(buf, count); 407 } 408 409 static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL, 410 store_enable_clk3a_output); 411 store_enable_clkb1_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)412 static ssize_t store_enable_clkb1_output(struct device *d, 413 struct device_attribute *attr, const char *buf, size_t count) 414 { 415 unsigned long flags; 416 unsigned long tmp; 417 unsigned char val; 418 419 sscanf(buf, "%lX", &tmp); 420 dev_dbg(d, "tmp = 0x%lX\n", tmp); 421 422 val = (unsigned char)tmp; 423 spin_lock_irqsave(&event_lock, flags); 424 SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3); 425 spin_unlock_irqrestore(&event_lock, flags); 426 427 return strnlen(buf, count); 428 } 429 430 static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL, 431 store_enable_clkb1_output); 432 433 store_enable_clka1_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)434 static ssize_t store_enable_clka1_output(struct device *d, 435 struct device_attribute *attr, const char *buf, size_t count) 436 { 437 unsigned long flags; 438 unsigned long tmp; 439 unsigned char val; 440 441 sscanf(buf, "%lX", &tmp); 442 dev_dbg(d, "tmp = 0x%lX\n", tmp); 443 444 val = (unsigned char)tmp; 445 spin_lock_irqsave(&event_lock, flags); 446 SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2); 447 spin_unlock_irqrestore(&event_lock, flags); 448 449 return strnlen(buf, count); 450 } 451 452 static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL, 453 store_enable_clka1_output); 454 store_enable_clkb0_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)455 static ssize_t store_enable_clkb0_output(struct device *d, 456 struct device_attribute *attr, const char *buf, size_t count) 457 { 458 unsigned long flags; 459 unsigned long tmp; 460 unsigned char val; 461 462 sscanf(buf, "%lX", &tmp); 463 dev_dbg(d, "tmp = 0x%lX\n", tmp); 464 465 val = (unsigned char)tmp; 466 spin_lock_irqsave(&event_lock, flags); 467 SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1); 468 spin_unlock_irqrestore(&event_lock, flags); 469 470 return strnlen(buf, count); 471 } 472 473 static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL, 474 store_enable_clkb0_output); 475 store_enable_clka0_output(struct device * d,struct device_attribute * attr,const char * buf,size_t count)476 static ssize_t store_enable_clka0_output(struct device *d, 477 struct device_attribute *attr, const char *buf, size_t count) 478 { 479 unsigned long flags; 480 unsigned long tmp; 481 unsigned char val; 482 483 sscanf(buf, "%lX", &tmp); 484 dev_dbg(d, "tmp = 0x%lX\n", tmp); 485 486 val = (unsigned char)tmp; 487 spin_lock_irqsave(&event_lock, flags); 488 SET_PORT_BITS(TLCLK_REG2, 0xfe, val); 489 spin_unlock_irqrestore(&event_lock, flags); 490 491 return strnlen(buf, count); 492 } 493 494 static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL, 495 store_enable_clka0_output); 496 store_select_amcb2_transmit_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)497 static ssize_t store_select_amcb2_transmit_clock(struct device *d, 498 struct device_attribute *attr, const char *buf, size_t count) 499 { 500 unsigned long flags; 501 unsigned long tmp; 502 unsigned char val; 503 504 sscanf(buf, "%lX", &tmp); 505 dev_dbg(d, "tmp = 0x%lX\n", tmp); 506 507 val = (unsigned char)tmp; 508 spin_lock_irqsave(&event_lock, flags); 509 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) { 510 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28); 511 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val); 512 } else if (val >= CLK_8_592MHz) { 513 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38); 514 switch (val) { 515 case CLK_8_592MHz: 516 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2); 517 break; 518 case CLK_11_184MHz: 519 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0); 520 break; 521 case CLK_34_368MHz: 522 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3); 523 break; 524 case CLK_44_736MHz: 525 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1); 526 break; 527 } 528 } else { 529 SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3); 530 } 531 spin_unlock_irqrestore(&event_lock, flags); 532 533 return strnlen(buf, count); 534 } 535 536 static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL, 537 store_select_amcb2_transmit_clock); 538 store_select_amcb1_transmit_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)539 static ssize_t store_select_amcb1_transmit_clock(struct device *d, 540 struct device_attribute *attr, const char *buf, size_t count) 541 { 542 unsigned long tmp; 543 unsigned char val; 544 unsigned long flags; 545 546 sscanf(buf, "%lX", &tmp); 547 dev_dbg(d, "tmp = 0x%lX\n", tmp); 548 549 val = (unsigned char)tmp; 550 spin_lock_irqsave(&event_lock, flags); 551 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) { 552 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5); 553 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val); 554 } else if (val >= CLK_8_592MHz) { 555 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7); 556 switch (val) { 557 case CLK_8_592MHz: 558 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2); 559 break; 560 case CLK_11_184MHz: 561 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0); 562 break; 563 case CLK_34_368MHz: 564 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3); 565 break; 566 case CLK_44_736MHz: 567 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1); 568 break; 569 } 570 } else { 571 SET_PORT_BITS(TLCLK_REG3, 0xf8, val); 572 } 573 spin_unlock_irqrestore(&event_lock, flags); 574 575 return strnlen(buf, count); 576 } 577 578 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL, 579 store_select_amcb1_transmit_clock); 580 store_select_redundant_clock(struct device * d,struct device_attribute * attr,const char * buf,size_t count)581 static ssize_t store_select_redundant_clock(struct device *d, 582 struct device_attribute *attr, const char *buf, size_t count) 583 { 584 unsigned long tmp; 585 unsigned char val; 586 unsigned long flags; 587 588 sscanf(buf, "%lX", &tmp); 589 dev_dbg(d, "tmp = 0x%lX\n", tmp); 590 591 val = (unsigned char)tmp; 592 spin_lock_irqsave(&event_lock, flags); 593 SET_PORT_BITS(TLCLK_REG1, 0xfe, val); 594 spin_unlock_irqrestore(&event_lock, flags); 595 596 return strnlen(buf, count); 597 } 598 599 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL, 600 store_select_redundant_clock); 601 store_select_ref_frequency(struct device * d,struct device_attribute * attr,const char * buf,size_t count)602 static ssize_t store_select_ref_frequency(struct device *d, 603 struct device_attribute *attr, const char *buf, size_t count) 604 { 605 unsigned long tmp; 606 unsigned char val; 607 unsigned long flags; 608 609 sscanf(buf, "%lX", &tmp); 610 dev_dbg(d, "tmp = 0x%lX\n", tmp); 611 612 val = (unsigned char)tmp; 613 spin_lock_irqsave(&event_lock, flags); 614 SET_PORT_BITS(TLCLK_REG1, 0xfd, val); 615 spin_unlock_irqrestore(&event_lock, flags); 616 617 return strnlen(buf, count); 618 } 619 620 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL, 621 store_select_ref_frequency); 622 store_filter_select(struct device * d,struct device_attribute * attr,const char * buf,size_t count)623 static ssize_t store_filter_select(struct device *d, 624 struct device_attribute *attr, const char *buf, size_t count) 625 { 626 unsigned long tmp; 627 unsigned char val; 628 unsigned long flags; 629 630 sscanf(buf, "%lX", &tmp); 631 dev_dbg(d, "tmp = 0x%lX\n", tmp); 632 633 val = (unsigned char)tmp; 634 spin_lock_irqsave(&event_lock, flags); 635 SET_PORT_BITS(TLCLK_REG0, 0xfb, val); 636 spin_unlock_irqrestore(&event_lock, flags); 637 638 return strnlen(buf, count); 639 } 640 641 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select); 642 store_hardware_switching_mode(struct device * d,struct device_attribute * attr,const char * buf,size_t count)643 static ssize_t store_hardware_switching_mode(struct device *d, 644 struct device_attribute *attr, const char *buf, size_t count) 645 { 646 unsigned long tmp; 647 unsigned char val; 648 unsigned long flags; 649 650 sscanf(buf, "%lX", &tmp); 651 dev_dbg(d, "tmp = 0x%lX\n", tmp); 652 653 val = (unsigned char)tmp; 654 spin_lock_irqsave(&event_lock, flags); 655 SET_PORT_BITS(TLCLK_REG0, 0xbf, val); 656 spin_unlock_irqrestore(&event_lock, flags); 657 658 return strnlen(buf, count); 659 } 660 661 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL, 662 store_hardware_switching_mode); 663 store_hardware_switching(struct device * d,struct device_attribute * attr,const char * buf,size_t count)664 static ssize_t store_hardware_switching(struct device *d, 665 struct device_attribute *attr, const char *buf, size_t count) 666 { 667 unsigned long tmp; 668 unsigned char val; 669 unsigned long flags; 670 671 sscanf(buf, "%lX", &tmp); 672 dev_dbg(d, "tmp = 0x%lX\n", tmp); 673 674 val = (unsigned char)tmp; 675 spin_lock_irqsave(&event_lock, flags); 676 SET_PORT_BITS(TLCLK_REG0, 0x7f, val); 677 spin_unlock_irqrestore(&event_lock, flags); 678 679 return strnlen(buf, count); 680 } 681 682 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL, 683 store_hardware_switching); 684 store_refalign(struct device * d,struct device_attribute * attr,const char * buf,size_t count)685 static ssize_t store_refalign (struct device *d, 686 struct device_attribute *attr, const char *buf, size_t count) 687 { 688 unsigned long tmp; 689 unsigned long flags; 690 691 sscanf(buf, "%lX", &tmp); 692 dev_dbg(d, "tmp = 0x%lX\n", tmp); 693 spin_lock_irqsave(&event_lock, flags); 694 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0); 695 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08); 696 SET_PORT_BITS(TLCLK_REG0, 0xf7, 0); 697 spin_unlock_irqrestore(&event_lock, flags); 698 699 return strnlen(buf, count); 700 } 701 702 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign); 703 store_mode_select(struct device * d,struct device_attribute * attr,const char * buf,size_t count)704 static ssize_t store_mode_select (struct device *d, 705 struct device_attribute *attr, const char *buf, size_t count) 706 { 707 unsigned long tmp; 708 unsigned char val; 709 unsigned long flags; 710 711 sscanf(buf, "%lX", &tmp); 712 dev_dbg(d, "tmp = 0x%lX\n", tmp); 713 714 val = (unsigned char)tmp; 715 spin_lock_irqsave(&event_lock, flags); 716 SET_PORT_BITS(TLCLK_REG0, 0xcf, val); 717 spin_unlock_irqrestore(&event_lock, flags); 718 719 return strnlen(buf, count); 720 } 721 722 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select); 723 store_reset(struct device * d,struct device_attribute * attr,const char * buf,size_t count)724 static ssize_t store_reset (struct device *d, 725 struct device_attribute *attr, const char *buf, size_t count) 726 { 727 unsigned long tmp; 728 unsigned char val; 729 unsigned long flags; 730 731 sscanf(buf, "%lX", &tmp); 732 dev_dbg(d, "tmp = 0x%lX\n", tmp); 733 734 val = (unsigned char)tmp; 735 spin_lock_irqsave(&event_lock, flags); 736 SET_PORT_BITS(TLCLK_REG4, 0xfd, val); 737 spin_unlock_irqrestore(&event_lock, flags); 738 739 return strnlen(buf, count); 740 } 741 742 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset); 743 744 static struct attribute *tlclk_sysfs_entries[] = { 745 &dev_attr_current_ref.attr, 746 &dev_attr_telclock_version.attr, 747 &dev_attr_alarms.attr, 748 &dev_attr_received_ref_clk3a.attr, 749 &dev_attr_received_ref_clk3b.attr, 750 &dev_attr_enable_clk3a_output.attr, 751 &dev_attr_enable_clk3b_output.attr, 752 &dev_attr_enable_clkb1_output.attr, 753 &dev_attr_enable_clka1_output.attr, 754 &dev_attr_enable_clkb0_output.attr, 755 &dev_attr_enable_clka0_output.attr, 756 &dev_attr_select_amcb1_transmit_clock.attr, 757 &dev_attr_select_amcb2_transmit_clock.attr, 758 &dev_attr_select_redundant_clock.attr, 759 &dev_attr_select_ref_frequency.attr, 760 &dev_attr_filter_select.attr, 761 &dev_attr_hardware_switching_mode.attr, 762 &dev_attr_hardware_switching.attr, 763 &dev_attr_refalign.attr, 764 &dev_attr_mode_select.attr, 765 &dev_attr_reset.attr, 766 NULL 767 }; 768 769 static const struct attribute_group tlclk_attribute_group = { 770 .name = NULL, /* put in device directory */ 771 .attrs = tlclk_sysfs_entries, 772 }; 773 774 static struct platform_device *tlclk_device; 775 tlclk_init(void)776 static int __init tlclk_init(void) 777 { 778 int ret; 779 780 telclk_interrupt = (inb(TLCLK_REG7) & 0x0f); 781 782 alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL); 783 if (!alarm_events) { 784 ret = -ENOMEM; 785 goto out1; 786 } 787 788 ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops); 789 if (ret < 0) { 790 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major); 791 kfree(alarm_events); 792 return ret; 793 } 794 tlclk_major = ret; 795 796 /* Read telecom clock IRQ number (Set by BIOS) */ 797 if (!request_region(TLCLK_BASE, 8, "telco_clock")) { 798 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n", 799 TLCLK_BASE); 800 ret = -EBUSY; 801 goto out2; 802 } 803 804 if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */ 805 printk(KERN_ERR "telclk_interrupt = 0x%x non-mcpbl0010 hw.\n", 806 telclk_interrupt); 807 ret = -ENXIO; 808 goto out3; 809 } 810 811 timer_setup(&switchover_timer, switchover_timeout, 0); 812 813 ret = misc_register(&tlclk_miscdev); 814 if (ret < 0) { 815 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret); 816 goto out3; 817 } 818 819 tlclk_device = platform_device_register_simple("telco_clock", 820 -1, NULL, 0); 821 if (IS_ERR(tlclk_device)) { 822 printk(KERN_ERR "tlclk: platform_device_register failed.\n"); 823 ret = PTR_ERR(tlclk_device); 824 goto out4; 825 } 826 827 ret = sysfs_create_group(&tlclk_device->dev.kobj, 828 &tlclk_attribute_group); 829 if (ret) { 830 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n"); 831 goto out5; 832 } 833 834 return 0; 835 out5: 836 platform_device_unregister(tlclk_device); 837 out4: 838 misc_deregister(&tlclk_miscdev); 839 out3: 840 release_region(TLCLK_BASE, 8); 841 out2: 842 kfree(alarm_events); 843 unregister_chrdev(tlclk_major, "telco_clock"); 844 out1: 845 return ret; 846 } 847 tlclk_cleanup(void)848 static void __exit tlclk_cleanup(void) 849 { 850 sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group); 851 platform_device_unregister(tlclk_device); 852 misc_deregister(&tlclk_miscdev); 853 unregister_chrdev(tlclk_major, "telco_clock"); 854 855 release_region(TLCLK_BASE, 8); 856 del_timer_sync(&switchover_timer); 857 kfree(alarm_events); 858 859 } 860 switchover_timeout(struct timer_list * unused)861 static void switchover_timeout(struct timer_list *unused) 862 { 863 unsigned long flags = tlclk_timer_data; 864 865 if ((flags & 1)) { 866 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08)) 867 alarm_events->switchover_primary++; 868 } else { 869 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08)) 870 alarm_events->switchover_secondary++; 871 } 872 873 /* Alarm processing is done, wake up read task */ 874 del_timer(&switchover_timer); 875 got_event = 1; 876 wake_up(&wq); 877 } 878 tlclk_interrupt(int irq,void * dev_id)879 static irqreturn_t tlclk_interrupt(int irq, void *dev_id) 880 { 881 unsigned long flags; 882 883 spin_lock_irqsave(&event_lock, flags); 884 /* Read and clear interrupt events */ 885 int_events = inb(TLCLK_REG6); 886 887 /* Primary_Los changed from 0 to 1 ? */ 888 if (int_events & PRI_LOS_01_MASK) { 889 if (inb(TLCLK_REG2) & SEC_LOST_MASK) 890 alarm_events->lost_clocks++; 891 else 892 alarm_events->lost_primary_clock++; 893 } 894 895 /* Primary_Los changed from 1 to 0 ? */ 896 if (int_events & PRI_LOS_10_MASK) { 897 alarm_events->primary_clock_back++; 898 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1); 899 } 900 /* Secondary_Los changed from 0 to 1 ? */ 901 if (int_events & SEC_LOS_01_MASK) { 902 if (inb(TLCLK_REG2) & PRI_LOST_MASK) 903 alarm_events->lost_clocks++; 904 else 905 alarm_events->lost_secondary_clock++; 906 } 907 /* Secondary_Los changed from 1 to 0 ? */ 908 if (int_events & SEC_LOS_10_MASK) { 909 alarm_events->secondary_clock_back++; 910 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0); 911 } 912 if (int_events & HOLDOVER_10_MASK) 913 alarm_events->pll_end_holdover++; 914 915 if (int_events & UNLOCK_01_MASK) 916 alarm_events->pll_lost_sync++; 917 918 if (int_events & UNLOCK_10_MASK) 919 alarm_events->pll_sync++; 920 921 /* Holdover changed from 0 to 1 ? */ 922 if (int_events & HOLDOVER_01_MASK) { 923 alarm_events->pll_holdover++; 924 925 /* TIMEOUT in ~10ms */ 926 switchover_timer.expires = jiffies + msecs_to_jiffies(10); 927 tlclk_timer_data = inb(TLCLK_REG1); 928 mod_timer(&switchover_timer, switchover_timer.expires); 929 } else { 930 got_event = 1; 931 wake_up(&wq); 932 } 933 spin_unlock_irqrestore(&event_lock, flags); 934 935 return IRQ_HANDLED; 936 } 937 938 module_init(tlclk_init); 939 module_exit(tlclk_cleanup); 940