drivers/char/tlclk.c

   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
 190 static struct tlclk_alarms *alarm_events;
 191
 192 static DEFINE_SPINLOCK(event_lock);
 193
 194 static int tlclk_major = TLCLK_MAJOR;
 195
 196 static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 197
 198 static DECLARE_WAIT_QUEUE_HEAD(wq);
 199
 200 static int tlclk_open(struct inode *inode, struct file *filp)
 201 {
 202         int result;
 203
 204         /* Make sure there is no interrupt pending while
 205          * initialising interrupt handler */
 206         inb(TLCLK_REG6);
 207
 208         /* This device is wired through the FPGA IO space of the ATCA blade
 209          * we can't share this IRQ */
 210         result = request_irq(telclk_interrupt, &tlclk_interrupt,
 211                              IRQF_DISABLED, "telco_clock", tlclk_interrupt);
 212         if (result == -EBUSY) {
 213                 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
 214                 return -EBUSY;
 215         }
 216         inb(TLCLK_REG6);        /* Clear interrupt events */
 217
 218         return 0;
 219 }
 220
 221 static int tlclk_release(struct inode *inode, struct file *filp)
 222 {
 223         free_irq(telclk_interrupt, tlclk_interrupt);
 224
 225         return 0;
 226 }
 227
 228 static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
 229                 loff_t *f_pos)
 230 {
 231         if (count < sizeof(struct tlclk_alarms))
 232                 return -EIO;
 233
 234         wait_event_interruptible(wq, got_event);
 235         if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms)))
 236                 return -EFAULT;
 237
 238         memset(alarm_events, 0, sizeof(struct tlclk_alarms));
 239         got_event = 0;
 240
 241         return  sizeof(struct tlclk_alarms);
 242 }
 243
 244 static ssize_t tlclk_write(struct file *filp, const char __user *buf, size_t count,
 245             loff_t *f_pos)
 246 {
 247         return 0;
 248 }
 249
 250 static const struct file_operations tlclk_fops = {
 251         .read = tlclk_read,
 252         .write = tlclk_write,
 253         .open = tlclk_open,
 254         .release = tlclk_release,
 255
 256 };
 257
 258 static struct miscdevice tlclk_miscdev = {
 259         .minor = MISC_DYNAMIC_MINOR,
 260         .name = "telco_clock",
 261         .fops = &tlclk_fops,
 262 };
 263
 264 static ssize_t show_current_ref(struct device *d,
 265                 struct device_attribute *attr, char *buf)
 266 {
 267         unsigned long ret_val;
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&event_lock, flags);
 271         ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3);
 272         spin_unlock_irqrestore(&event_lock, flags);
 273
 274         return sprintf(buf, "0x%lX\n", ret_val);
 275 }
 276
 277 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
 278
 279
 280 static ssize_t show_telclock_version(struct device *d,
 281                 struct device_attribute *attr, char *buf)
 282 {
 283         unsigned long ret_val;
 284         unsigned long flags;
 285
 286         spin_lock_irqsave(&event_lock, flags);
 287         ret_val = inb(TLCLK_REG5);
 288         spin_unlock_irqrestore(&event_lock, flags);
 289
 290         return sprintf(buf, "0x%lX\n", ret_val);
 291 }
 292
 293 static DEVICE_ATTR(telclock_version, S_IRUGO,
 294                 show_telclock_version, NULL);
 295
 296 static ssize_t show_alarms(struct device *d,
 297                 struct device_attribute *attr,  char *buf)
 298 {
 299         unsigned long ret_val;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&event_lock, flags);
 303         ret_val = (inb(TLCLK_REG2) & 0xf0);
 304         spin_unlock_irqrestore(&event_lock, flags);
 305
 306         return sprintf(buf, "0x%lX\n", ret_val);
 307 }
 308
 309 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 310
 311 static ssize_t store_received_ref_clk3a(struct device *d,
 312                  struct device_attribute *attr, const char *buf, size_t count)
 313 {
 314         unsigned long tmp;
 315         unsigned char val;
 316         unsigned long flags;
 317
 318         sscanf(buf, "%lX", &tmp);
 319         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 320
 321         val = (unsigned char)tmp;
 322         spin_lock_irqsave(&event_lock, flags);
 323         SET_PORT_BITS(TLCLK_REG1, 0xef, val);
 324         spin_unlock_irqrestore(&event_lock, flags);
 325
 326         return strnlen(buf, count);
 327 }
 328
 329 static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
 330                 store_received_ref_clk3a);
 331
 332
 333 static ssize_t store_received_ref_clk3b(struct device *d,
 334                  struct device_attribute *attr, const char *buf, size_t count)
 335 {
 336         unsigned long tmp;
 337         unsigned char val;
 338         unsigned long flags;
 339
 340         sscanf(buf, "%lX", &tmp);
 341         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 342
 343         val = (unsigned char)tmp;
 344         spin_lock_irqsave(&event_lock, flags);
 345         SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
 346         spin_unlock_irqrestore(&event_lock, flags);
 347
 348         return strnlen(buf, count);
 349 }
 350
 351 static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
 352                 store_received_ref_clk3b);
 353
 354
 355 static ssize_t store_enable_clk3b_output(struct device *d,
 356                  struct device_attribute *attr, const char *buf, size_t count)
 357 {
 358         unsigned long tmp;
 359         unsigned char val;
 360         unsigned long flags;
 361
 362         sscanf(buf, "%lX", &tmp);
 363         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 364
 365         val = (unsigned char)tmp;
 366         spin_lock_irqsave(&event_lock, flags);
 367         SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
 368         spin_unlock_irqrestore(&event_lock, flags);
 369
 370         return strnlen(buf, count);
 371 }
 372
 373 static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
 374                 store_enable_clk3b_output);
 375
 376 static ssize_t store_enable_clk3a_output(struct device *d,
 377                  struct device_attribute *attr, const char *buf, size_t count)
 378 {
 379         unsigned long flags;
 380         unsigned long tmp;
 381         unsigned char val;
 382
 383         sscanf(buf, "%lX", &tmp);
 384         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 385
 386         val = (unsigned char)tmp;
 387         spin_lock_irqsave(&event_lock, flags);
 388         SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
 389         spin_unlock_irqrestore(&event_lock, flags);
 390
 391         return strnlen(buf, count);
 392 }
 393
 394 static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
 395                 store_enable_clk3a_output);
 396
 397 static ssize_t store_enable_clkb1_output(struct device *d,
 398                  struct device_attribute *attr, const char *buf, size_t count)
 399 {
 400         unsigned long flags;
 401         unsigned long tmp;
 402         unsigned char val;
 403
 404         sscanf(buf, "%lX", &tmp);
 405         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 406
 407         val = (unsigned char)tmp;
 408         spin_lock_irqsave(&event_lock, flags);
 409         SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
 410         spin_unlock_irqrestore(&event_lock, flags);
 411
 412         return strnlen(buf, count);
 413 }
 414
 415 static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
 416                 store_enable_clkb1_output);
 417
 418
 419 static ssize_t store_enable_clka1_output(struct device *d,
 420                  struct device_attribute *attr, const char *buf, size_t count)
 421 {
 422         unsigned long flags;
 423         unsigned long tmp;
 424         unsigned char val;
 425
 426         sscanf(buf, "%lX", &tmp);
 427         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 428
 429         val = (unsigned char)tmp;
 430         spin_lock_irqsave(&event_lock, flags);
 431         SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
 432         spin_unlock_irqrestore(&event_lock, flags);
 433
 434         return strnlen(buf, count);
 435 }
 436
 437 static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
 438                 store_enable_clka1_output);
 439
 440 static ssize_t store_enable_clkb0_output(struct device *d,
 441                  struct device_attribute *attr, const char *buf, size_t count)
 442 {
 443         unsigned long flags;
 444         unsigned long tmp;
 445         unsigned char val;
 446
 447         sscanf(buf, "%lX", &tmp);
 448         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 449
 450         val = (unsigned char)tmp;
 451         spin_lock_irqsave(&event_lock, flags);
 452         SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
 453         spin_unlock_irqrestore(&event_lock, flags);
 454
 455         return strnlen(buf, count);
 456 }
 457
 458 static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
 459                 store_enable_clkb0_output);
 460
 461 static ssize_t store_enable_clka0_output(struct device *d,
 462                  struct device_attribute *attr, const char *buf, size_t count)
 463 {
 464         unsigned long flags;
 465         unsigned long tmp;
 466         unsigned char val;
 467
 468         sscanf(buf, "%lX", &tmp);
 469         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 470
 471         val = (unsigned char)tmp;
 472         spin_lock_irqsave(&event_lock, flags);
 473         SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
 474         spin_unlock_irqrestore(&event_lock, flags);
 475
 476         return strnlen(buf, count);
 477 }
 478
 479 static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
 480                 store_enable_clka0_output);
 481
 482 static ssize_t store_select_amcb2_transmit_clock(struct device *d,
 483                 struct device_attribute *attr, const char *buf, size_t count)
 484 {
 485         unsigned long flags;
 486         unsigned long tmp;
 487         unsigned char val;
 488
 489         sscanf(buf, "%lX", &tmp);
 490         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 491
 492         val = (unsigned char)tmp;
 493         spin_lock_irqsave(&event_lock, flags);
 494                 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 495                         SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
 496                         SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 497                 } else if (val >= CLK_8_592MHz) {
 498                         SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
 499                         switch (val) {
 500                         case CLK_8_592MHz:
 501                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 502                                 break;
 503                         case CLK_11_184MHz:
 504                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 505                                 break;
 506                         case CLK_34_368MHz:
 507                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 508                                 break;
 509                         case CLK_44_736MHz:
 510                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 511                                 break;
 512                         }
 513                 } else
 514                         SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
 515
 516         spin_unlock_irqrestore(&event_lock, flags);
 517
 518         return strnlen(buf, count);
 519 }
 520
 521 static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 522         store_select_amcb2_transmit_clock);
 523
 524 static ssize_t store_select_amcb1_transmit_clock(struct device *d,
 525                  struct device_attribute *attr, const char *buf, size_t count)
 526 {
 527         unsigned long tmp;
 528         unsigned char val;
 529         unsigned long flags;
 530
 531         sscanf(buf, "%lX", &tmp);
 532         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 533
 534         val = (unsigned char)tmp;
 535         spin_lock_irqsave(&event_lock, flags);
 536                 if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 537                         SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
 538                         SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 539                 } else if (val >= CLK_8_592MHz) {
 540                         SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
 541                         switch (val) {
 542                         case CLK_8_592MHz:
 543                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 544                                 break;
 545                         case CLK_11_184MHz:
 546                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 547                                 break;
 548                         case CLK_34_368MHz:
 549                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 550                                 break;
 551                         case CLK_44_736MHz:
 552                                 SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 553                                 break;
 554                         }
 555                 } else
 556                         SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
 557         spin_unlock_irqrestore(&event_lock, flags);
 558
 559         return strnlen(buf, count);
 560 }
 561
 562 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 563                 store_select_amcb1_transmit_clock);
 564
 565 static ssize_t store_select_redundant_clock(struct device *d,
 566                  struct device_attribute *attr, const char *buf, size_t count)
 567 {
 568         unsigned long tmp;
 569         unsigned char val;
 570         unsigned long flags;
 571
 572         sscanf(buf, "%lX", &tmp);
 573         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 574
 575         val = (unsigned char)tmp;
 576         spin_lock_irqsave(&event_lock, flags);
 577         SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
 578         spin_unlock_irqrestore(&event_lock, flags);
 579
 580         return strnlen(buf, count);
 581 }
 582
 583 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
 584                 store_select_redundant_clock);
 585
 586 static ssize_t store_select_ref_frequency(struct device *d,
 587                  struct device_attribute *attr, const char *buf, size_t count)
 588 {
 589         unsigned long tmp;
 590         unsigned char val;
 591         unsigned long flags;
 592
 593         sscanf(buf, "%lX", &tmp);
 594         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 595
 596         val = (unsigned char)tmp;
 597         spin_lock_irqsave(&event_lock, flags);
 598         SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
 599         spin_unlock_irqrestore(&event_lock, flags);
 600
 601         return strnlen(buf, count);
 602 }
 603
 604 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
 605                 store_select_ref_frequency);
 606
 607 static ssize_t store_filter_select(struct device *d,
 608                  struct device_attribute *attr, const char *buf, size_t count)
 609 {
 610         unsigned long tmp;
 611         unsigned char val;
 612         unsigned long flags;
 613
 614         sscanf(buf, "%lX", &tmp);
 615         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 616
 617         val = (unsigned char)tmp;
 618         spin_lock_irqsave(&event_lock, flags);
 619         SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
 620         spin_unlock_irqrestore(&event_lock, flags);
 621
 622         return strnlen(buf, count);
 623 }
 624
 625 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
 626
 627 static ssize_t store_hardware_switching_mode(struct device *d,
 628                  struct device_attribute *attr, const char *buf, size_t count)
 629 {
 630         unsigned long tmp;
 631         unsigned char val;
 632         unsigned long flags;
 633
 634         sscanf(buf, "%lX", &tmp);
 635         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 636
 637         val = (unsigned char)tmp;
 638         spin_lock_irqsave(&event_lock, flags);
 639         SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
 640         spin_unlock_irqrestore(&event_lock, flags);
 641
 642         return strnlen(buf, count);
 643 }
 644
 645 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
 646                 store_hardware_switching_mode);
 647
 648 static ssize_t store_hardware_switching(struct device *d,
 649                  struct device_attribute *attr, const char *buf, size_t count)
 650 {
 651         unsigned long tmp;
 652         unsigned char val;
 653         unsigned long flags;
 654
 655         sscanf(buf, "%lX", &tmp);
 656         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 657
 658         val = (unsigned char)tmp;
 659         spin_lock_irqsave(&event_lock, flags);
 660         SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
 661         spin_unlock_irqrestore(&event_lock, flags);
 662
 663         return strnlen(buf, count);
 664 }
 665
 666 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
 667                 store_hardware_switching);
 668
 669 static ssize_t store_refalign (struct device *d,
 670                  struct device_attribute *attr, const char *buf, size_t count)
 671 {
 672         unsigned long tmp;
 673         unsigned long flags;
 674
 675         sscanf(buf, "%lX", &tmp);
 676         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 677         spin_lock_irqsave(&event_lock, flags);
 678         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 679         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
 680         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 681         spin_unlock_irqrestore(&event_lock, flags);
 682
 683         return strnlen(buf, count);
 684 }
 685
 686 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
 687
 688 static ssize_t store_mode_select (struct device *d,
 689                  struct device_attribute *attr, const char *buf, size_t count)
 690 {
 691         unsigned long tmp;
 692         unsigned char val;
 693         unsigned long flags;
 694
 695         sscanf(buf, "%lX", &tmp);
 696         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 697
 698         val = (unsigned char)tmp;
 699         spin_lock_irqsave(&event_lock, flags);
 700         SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
 701         spin_unlock_irqrestore(&event_lock, flags);
 702
 703         return strnlen(buf, count);
 704 }
 705
 706 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
 707
 708 static ssize_t store_reset (struct device *d,
 709                  struct device_attribute *attr, const char *buf, size_t count)
 710 {
 711         unsigned long tmp;
 712         unsigned char val;
 713         unsigned long flags;
 714
 715         sscanf(buf, "%lX", &tmp);
 716         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 717
 718         val = (unsigned char)tmp;
 719         spin_lock_irqsave(&event_lock, flags);
 720         SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
 721         spin_unlock_irqrestore(&event_lock, flags);
 722
 723         return strnlen(buf, count);
 724 }
 725
 726 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
 727
 728 static struct attribute *tlclk_sysfs_entries[] = {
 729         &dev_attr_current_ref.attr,
 730         &dev_attr_telclock_version.attr,
 731         &dev_attr_alarms.attr,
 732         &dev_attr_received_ref_clk3a.attr,
 733         &dev_attr_received_ref_clk3b.attr,
 734         &dev_attr_enable_clk3a_output.attr,
 735         &dev_attr_enable_clk3b_output.attr,
 736         &dev_attr_enable_clkb1_output.attr,
 737         &dev_attr_enable_clka1_output.attr,
 738         &dev_attr_enable_clkb0_output.attr,
 739         &dev_attr_enable_clka0_output.attr,
 740         &dev_attr_select_amcb1_transmit_clock.attr,
 741         &dev_attr_select_amcb2_transmit_clock.attr,
 742         &dev_attr_select_redundant_clock.attr,
 743         &dev_attr_select_ref_frequency.attr,
 744         &dev_attr_filter_select.attr,
 745         &dev_attr_hardware_switching_mode.attr,
 746         &dev_attr_hardware_switching.attr,
 747         &dev_attr_refalign.attr,
 748         &dev_attr_mode_select.attr,
 749         &dev_attr_reset.attr,
 750         NULL
 751 };
 752
 753 static struct attribute_group tlclk_attribute_group = {
 754         .name = NULL,           /* put in device directory */
 755         .attrs = tlclk_sysfs_entries,
 756 };
 757
 758 static struct platform_device *tlclk_device;
 759
 760 static int __init tlclk_init(void)
 761 {
 762         int ret;
 763
 764         ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
 765         if (ret < 0) {
 766                 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
 767                 return ret;
 768         }
 769         tlclk_major = ret;
 770         alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
 771         if (!alarm_events)
 772                 goto out1;
 773
 774         /* Read telecom clock IRQ number (Set by BIOS) */
 775         if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 776                 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
 777                         TLCLK_BASE);
 778                 ret = -EBUSY;
 779                 goto out2;
 780         }
 781         telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 782
 783         if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
 784                 printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n",
 785                         telclk_interrupt);
 786                 ret = -ENXIO;
 787                 goto out3;
 788         }
 789
 790         init_timer(&switchover_timer);
 791
 792         ret = misc_register(&tlclk_miscdev);
 793         if (ret < 0) {
 794                 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
 795                 ret = -EBUSY;
 796                 goto out3;
 797         }
 798
 799         tlclk_device = platform_device_register_simple("telco_clock",
 800                                 -1, NULL, 0);
 801         if (!tlclk_device) {
 802                 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
 803                 ret = -EBUSY;
 804                 goto out4;
 805         }
 806
 807         ret = sysfs_create_group(&tlclk_device->dev.kobj,
 808                         &tlclk_attribute_group);
 809         if (ret) {
 810                 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
 811                 sysfs_remove_group(&tlclk_device->dev.kobj,
 812                         &tlclk_attribute_group);
 813                 goto out5;
 814         }
 815
 816         return 0;
 817 out5:
 818         platform_device_unregister(tlclk_device);
 819 out4:
 820         misc_deregister(&tlclk_miscdev);
 821 out3:
 822         release_region(TLCLK_BASE, 8);
 823 out2:
 824         kfree(alarm_events);
 825 out1:
 826         unregister_chrdev(tlclk_major, "telco_clock");
 827         return ret;
 828 }
 829
 830 static void __exit tlclk_cleanup(void)
 831 {
 832         sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
 833         platform_device_unregister(tlclk_device);
 834         misc_deregister(&tlclk_miscdev);
 835         unregister_chrdev(tlclk_major, "telco_clock");
 836
 837         release_region(TLCLK_BASE, 8);
 838         del_timer_sync(&switchover_timer);
 839         kfree(alarm_events);
 840
 841 }
 842
 843 static void switchover_timeout(unsigned long data)
 844 {
 845         if ((data & 1)) {
 846                 if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
 847                         alarm_events->switchover_primary++;
 848         } else {
 849                 if ((inb(TLCLK_REG1) & 0x08) != (data & 0x08))
 850                         alarm_events->switchover_secondary++;
 851         }
 852
 853         /* Alarm processing is done, wake up read task */
 854         del_timer(&switchover_timer);
 855         got_event = 1;
 856         wake_up(&wq);
 857 }
 858
 859 static irqreturn_t tlclk_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 860 {
 861         unsigned long flags;
 862
 863         spin_lock_irqsave(&event_lock, flags);
 864         /* Read and clear interrupt events */
 865         int_events = inb(TLCLK_REG6);
 866
 867         /* Primary_Los changed from 0 to 1 ? */
 868         if (int_events & PRI_LOS_01_MASK) {
 869                 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
 870                         alarm_events->lost_clocks++;
 871                 else
 872                         alarm_events->lost_primary_clock++;
 873         }
 874
 875         /* Primary_Los changed from 1 to 0 ? */
 876         if (int_events & PRI_LOS_10_MASK) {
 877                 alarm_events->primary_clock_back++;
 878                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
 879         }
 880         /* Secondary_Los changed from 0 to 1 ? */
 881         if (int_events & SEC_LOS_01_MASK) {
 882                 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
 883                         alarm_events->lost_clocks++;
 884                 else
 885                         alarm_events->lost_secondary_clock++;
 886         }
 887         /* Secondary_Los changed from 1 to 0 ? */
 888         if (int_events & SEC_LOS_10_MASK) {
 889                 alarm_events->secondary_clock_back++;
 890                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
 891         }
 892         if (int_events & HOLDOVER_10_MASK)
 893                 alarm_events->pll_end_holdover++;
 894
 895         if (int_events & UNLOCK_01_MASK)
 896                 alarm_events->pll_lost_sync++;
 897
 898         if (int_events & UNLOCK_10_MASK)
 899                 alarm_events->pll_sync++;
 900
 901         /* Holdover changed from 0 to 1 ? */
 902         if (int_events & HOLDOVER_01_MASK) {
 903                 alarm_events->pll_holdover++;
 904
 905                 /* TIMEOUT in ~10ms */
 906                 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
 907                 switchover_timer.data = inb(TLCLK_REG1);
 908                 add_timer(&switchover_timer);
 909         } else {
 910                 got_event = 1;
 911                 wake_up(&wq);
 912         }
 913         spin_unlock_irqrestore(&event_lock, flags);
 914
 915         return IRQ_HANDLED;
 916 }
 917
 918 module_init(tlclk_init);
 919 module_exit(tlclk_cleanup);