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/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/smp_lock.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 <asm/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(unsigned long data);
 188 static struct timer_list switchover_timer =
 189         TIMER_INITIALIZER(switchover_timeout , 0, 0);
 190 static unsigned long tlclk_timer_data;
 191
 192 static struct tlclk_alarms *alarm_events;
 193
 194 static DEFINE_SPINLOCK(event_lock);
 195
 196 static int tlclk_major = TLCLK_MAJOR;
 197
 198 static irqreturn_t tlclk_interrupt(int irq, void *dev_id);
 199
 200 static DECLARE_WAIT_QUEUE_HEAD(wq);
 201
 202 static unsigned long useflags;
 203 static DEFINE_MUTEX(tlclk_mutex);
 204
 205 static int tlclk_open(struct inode *inode, struct file *filp)
 206 {
 207         int result;
 208
 209         lock_kernel();
 210         if (test_and_set_bit(0, &useflags)) {
 211                 result = -EBUSY;
 212                 /* this legacy device is always one per system and it doesn't
 213                  * know how to handle multiple concurrent clients.
 214                  */
 215                 goto out;
 216         }
 217
 218         /* Make sure there is no interrupt pending while
 219          * initialising interrupt handler */
 220         inb(TLCLK_REG6);
 221
 222         /* This device is wired through the FPGA IO space of the ATCA blade
 223          * we can't share this IRQ */
 224         result = request_irq(telclk_interrupt, &tlclk_interrupt,
 225                              IRQF_DISABLED, "telco_clock", tlclk_interrupt);
 226         if (result == -EBUSY)
 227                 printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
 228         else
 229                 inb(TLCLK_REG6);        /* Clear interrupt events */
 230
 231 out:
 232         unlock_kernel();
 233         return result;
 234 }
 235
 236 static int tlclk_release(struct inode *inode, struct file *filp)
 237 {
 238         free_irq(telclk_interrupt, tlclk_interrupt);
 239         clear_bit(0, &useflags);
 240
 241         return 0;
 242 }
 243
 244 static ssize_t tlclk_read(struct file *filp, char __user *buf, size_t count,
 245                 loff_t *f_pos)
 246 {
 247         if (count < sizeof(struct tlclk_alarms))
 248                 return -EIO;
 249         if (mutex_lock_interruptible(&tlclk_mutex))
 250                 return -EINTR;
 251
 252
 253         wait_event_interruptible(wq, got_event);
 254         if (copy_to_user(buf, alarm_events, sizeof(struct tlclk_alarms))) {
 255                 mutex_unlock(&tlclk_mutex);
 256                 return -EFAULT;
 257         }
 258
 259         memset(alarm_events, 0, sizeof(struct tlclk_alarms));
 260         got_event = 0;
 261
 262         mutex_unlock(&tlclk_mutex);
 263         return  sizeof(struct tlclk_alarms);
 264 }
 265
 266 static const struct file_operations tlclk_fops = {
 267         .read = tlclk_read,
 268         .open = tlclk_open,
 269         .release = tlclk_release,
 270
 271 };
 272
 273 static struct miscdevice tlclk_miscdev = {
 274         .minor = MISC_DYNAMIC_MINOR,
 275         .name = "telco_clock",
 276         .fops = &tlclk_fops,
 277 };
 278
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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         spin_unlock_irqrestore(&event_lock, flags);
 573
 574         return strnlen(buf, count);
 575 }
 576
 577 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 578                 store_select_amcb1_transmit_clock);
 579
 580 static ssize_t store_select_redundant_clock(struct device *d,
 581                  struct device_attribute *attr, const char *buf, size_t count)
 582 {
 583         unsigned long tmp;
 584         unsigned char val;
 585         unsigned long flags;
 586
 587         sscanf(buf, "%lX", &tmp);
 588         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 589
 590         val = (unsigned char)tmp;
 591         spin_lock_irqsave(&event_lock, flags);
 592         SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
 593         spin_unlock_irqrestore(&event_lock, flags);
 594
 595         return strnlen(buf, count);
 596 }
 597
 598 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
 599                 store_select_redundant_clock);
 600
 601 static ssize_t store_select_ref_frequency(struct device *d,
 602                  struct device_attribute *attr, const char *buf, size_t count)
 603 {
 604         unsigned long tmp;
 605         unsigned char val;
 606         unsigned long flags;
 607
 608         sscanf(buf, "%lX", &tmp);
 609         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 610
 611         val = (unsigned char)tmp;
 612         spin_lock_irqsave(&event_lock, flags);
 613         SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
 614         spin_unlock_irqrestore(&event_lock, flags);
 615
 616         return strnlen(buf, count);
 617 }
 618
 619 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
 620                 store_select_ref_frequency);
 621
 622 static ssize_t store_filter_select(struct device *d,
 623                  struct device_attribute *attr, const char *buf, size_t count)
 624 {
 625         unsigned long tmp;
 626         unsigned char val;
 627         unsigned long flags;
 628
 629         sscanf(buf, "%lX", &tmp);
 630         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 631
 632         val = (unsigned char)tmp;
 633         spin_lock_irqsave(&event_lock, flags);
 634         SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
 635         spin_unlock_irqrestore(&event_lock, flags);
 636
 637         return strnlen(buf, count);
 638 }
 639
 640 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
 641
 642 static ssize_t store_hardware_switching_mode(struct device *d,
 643                  struct device_attribute *attr, const char *buf, size_t count)
 644 {
 645         unsigned long tmp;
 646         unsigned char val;
 647         unsigned long flags;
 648
 649         sscanf(buf, "%lX", &tmp);
 650         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 651
 652         val = (unsigned char)tmp;
 653         spin_lock_irqsave(&event_lock, flags);
 654         SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
 655         spin_unlock_irqrestore(&event_lock, flags);
 656
 657         return strnlen(buf, count);
 658 }
 659
 660 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
 661                 store_hardware_switching_mode);
 662
 663 static ssize_t store_hardware_switching(struct device *d,
 664                  struct device_attribute *attr, const char *buf, size_t count)
 665 {
 666         unsigned long tmp;
 667         unsigned char val;
 668         unsigned long flags;
 669
 670         sscanf(buf, "%lX", &tmp);
 671         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 672
 673         val = (unsigned char)tmp;
 674         spin_lock_irqsave(&event_lock, flags);
 675         SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
 676         spin_unlock_irqrestore(&event_lock, flags);
 677
 678         return strnlen(buf, count);
 679 }
 680
 681 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
 682                 store_hardware_switching);
 683
 684 static ssize_t store_refalign (struct device *d,
 685                  struct device_attribute *attr, const char *buf, size_t count)
 686 {
 687         unsigned long tmp;
 688         unsigned long flags;
 689
 690         sscanf(buf, "%lX", &tmp);
 691         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 692         spin_lock_irqsave(&event_lock, flags);
 693         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 694         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
 695         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 696         spin_unlock_irqrestore(&event_lock, flags);
 697
 698         return strnlen(buf, count);
 699 }
 700
 701 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
 702
 703 static ssize_t store_mode_select (struct device *d,
 704                  struct device_attribute *attr, const char *buf, size_t count)
 705 {
 706         unsigned long tmp;
 707         unsigned char val;
 708         unsigned long flags;
 709
 710         sscanf(buf, "%lX", &tmp);
 711         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 712
 713         val = (unsigned char)tmp;
 714         spin_lock_irqsave(&event_lock, flags);
 715         SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
 716         spin_unlock_irqrestore(&event_lock, flags);
 717
 718         return strnlen(buf, count);
 719 }
 720
 721 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
 722
 723 static ssize_t store_reset (struct device *d,
 724                  struct device_attribute *attr, const char *buf, size_t count)
 725 {
 726         unsigned long tmp;
 727         unsigned char val;
 728         unsigned long flags;
 729
 730         sscanf(buf, "%lX", &tmp);
 731         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 732
 733         val = (unsigned char)tmp;
 734         spin_lock_irqsave(&event_lock, flags);
 735         SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
 736         spin_unlock_irqrestore(&event_lock, flags);
 737
 738         return strnlen(buf, count);
 739 }
 740
 741 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
 742
 743 static struct attribute *tlclk_sysfs_entries[] = {
 744         &dev_attr_current_ref.attr,
 745         &dev_attr_telclock_version.attr,
 746         &dev_attr_alarms.attr,
 747         &dev_attr_received_ref_clk3a.attr,
 748         &dev_attr_received_ref_clk3b.attr,
 749         &dev_attr_enable_clk3a_output.attr,
 750         &dev_attr_enable_clk3b_output.attr,
 751         &dev_attr_enable_clkb1_output.attr,
 752         &dev_attr_enable_clka1_output.attr,
 753         &dev_attr_enable_clkb0_output.attr,
 754         &dev_attr_enable_clka0_output.attr,
 755         &dev_attr_select_amcb1_transmit_clock.attr,
 756         &dev_attr_select_amcb2_transmit_clock.attr,
 757         &dev_attr_select_redundant_clock.attr,
 758         &dev_attr_select_ref_frequency.attr,
 759         &dev_attr_filter_select.attr,
 760         &dev_attr_hardware_switching_mode.attr,
 761         &dev_attr_hardware_switching.attr,
 762         &dev_attr_refalign.attr,
 763         &dev_attr_mode_select.attr,
 764         &dev_attr_reset.attr,
 765         NULL
 766 };
 767
 768 static struct attribute_group tlclk_attribute_group = {
 769         .name = NULL,           /* put in device directory */
 770         .attrs = tlclk_sysfs_entries,
 771 };
 772
 773 static struct platform_device *tlclk_device;
 774
 775 static int __init tlclk_init(void)
 776 {
 777         int ret;
 778
 779         ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
 780         if (ret < 0) {
 781                 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
 782                 return ret;
 783         }
 784         tlclk_major = ret;
 785         alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
 786         if (!alarm_events)
 787                 goto out1;
 788
 789         /* Read telecom clock IRQ number (Set by BIOS) */
 790         if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 791                 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
 792                         TLCLK_BASE);
 793                 ret = -EBUSY;
 794                 goto out2;
 795         }
 796         telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 797
 798         if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
 799                 printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n",
 800                         telclk_interrupt);
 801                 ret = -ENXIO;
 802                 goto out3;
 803         }
 804
 805         init_timer(&switchover_timer);
 806
 807         ret = misc_register(&tlclk_miscdev);
 808         if (ret < 0) {
 809                 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
 810                 goto out3;
 811         }
 812
 813         tlclk_device = platform_device_register_simple("telco_clock",
 814                                 -1, NULL, 0);
 815         if (IS_ERR(tlclk_device)) {
 816                 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
 817                 ret = PTR_ERR(tlclk_device);
 818                 goto out4;
 819         }
 820
 821         ret = sysfs_create_group(&tlclk_device->dev.kobj,
 822                         &tlclk_attribute_group);
 823         if (ret) {
 824                 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
 825                 goto out5;
 826         }
 827
 828         return 0;
 829 out5:
 830         platform_device_unregister(tlclk_device);
 831 out4:
 832         misc_deregister(&tlclk_miscdev);
 833 out3:
 834         release_region(TLCLK_BASE, 8);
 835 out2:
 836         kfree(alarm_events);
 837 out1:
 838         unregister_chrdev(tlclk_major, "telco_clock");
 839         return ret;
 840 }
 841
 842 static void __exit tlclk_cleanup(void)
 843 {
 844         sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
 845         platform_device_unregister(tlclk_device);
 846         misc_deregister(&tlclk_miscdev);
 847         unregister_chrdev(tlclk_major, "telco_clock");
 848
 849         release_region(TLCLK_BASE, 8);
 850         del_timer_sync(&switchover_timer);
 851         kfree(alarm_events);
 852
 853 }
 854
 855 static void switchover_timeout(unsigned long data)
 856 {
 857         unsigned long flags = *(unsigned long *) data;
 858
 859         if ((flags & 1)) {
 860                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 861                         alarm_events->switchover_primary++;
 862         } else {
 863                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 864                         alarm_events->switchover_secondary++;
 865         }
 866
 867         /* Alarm processing is done, wake up read task */
 868         del_timer(&switchover_timer);
 869         got_event = 1;
 870         wake_up(&wq);
 871 }
 872
 873 static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
 874 {
 875         unsigned long flags;
 876
 877         spin_lock_irqsave(&event_lock, flags);
 878         /* Read and clear interrupt events */
 879         int_events = inb(TLCLK_REG6);
 880
 881         /* Primary_Los changed from 0 to 1 ? */
 882         if (int_events & PRI_LOS_01_MASK) {
 883                 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
 884                         alarm_events->lost_clocks++;
 885                 else
 886                         alarm_events->lost_primary_clock++;
 887         }
 888
 889         /* Primary_Los changed from 1 to 0 ? */
 890         if (int_events & PRI_LOS_10_MASK) {
 891                 alarm_events->primary_clock_back++;
 892                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
 893         }
 894         /* Secondary_Los changed from 0 to 1 ? */
 895         if (int_events & SEC_LOS_01_MASK) {
 896                 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
 897                         alarm_events->lost_clocks++;
 898                 else
 899                         alarm_events->lost_secondary_clock++;
 900         }
 901         /* Secondary_Los changed from 1 to 0 ? */
 902         if (int_events & SEC_LOS_10_MASK) {
 903                 alarm_events->secondary_clock_back++;
 904                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
 905         }
 906         if (int_events & HOLDOVER_10_MASK)
 907                 alarm_events->pll_end_holdover++;
 908
 909         if (int_events & UNLOCK_01_MASK)
 910                 alarm_events->pll_lost_sync++;
 911
 912         if (int_events & UNLOCK_10_MASK)
 913                 alarm_events->pll_sync++;
 914
 915         /* Holdover changed from 0 to 1 ? */
 916         if (int_events & HOLDOVER_01_MASK) {
 917                 alarm_events->pll_holdover++;
 918
 919                 /* TIMEOUT in ~10ms */
 920                 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
 921                 tlclk_timer_data = inb(TLCLK_REG1);
 922                 switchover_timer.data = (unsigned long) &tlclk_timer_data;
 923                 mod_timer(&switchover_timer, switchover_timer.expires);
 924         } else {
 925                 got_event = 1;
 926                 wake_up(&wq);
 927         }
 928         spin_unlock_irqrestore(&event_lock, flags);
 929
 930         return IRQ_HANDLED;
 931 }
 932
 933 module_init(tlclk_init);
 934 module_exit(tlclk_cleanup);