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/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_DESCRIPTION("Telecom Clock driver for Intel NetStructure(tm) MPCBL0010");
  51 MODULE_LICENSE("GPL");
  52
  53 /*Hardware Reset of the PLL */
  54 #define RESET_ON        0x00
  55 #define RESET_OFF       0x01
  56
  57 /* MODE SELECT */
  58 #define NORMAL_MODE     0x00
  59 #define HOLDOVER_MODE   0x10
  60 #define FREERUN_MODE    0x20
  61
  62 /* FILTER SELECT */
  63 #define FILTER_6HZ      0x04
  64 #define FILTER_12HZ     0x00
  65
  66 /* SELECT REFERENCE FREQUENCY */
  67 #define REF_CLK1_8kHz           0x00
  68 #define REF_CLK2_19_44MHz       0x02
  69
  70 /* Select primary or secondary redundant clock */
  71 #define PRIMARY_CLOCK   0x00
  72 #define SECONDARY_CLOCK 0x01
  73
  74 /* CLOCK TRANSMISSION DEFINE */
  75 #define CLK_8kHz        0xff
  76 #define CLK_16_384MHz   0xfb
  77
  78 #define CLK_1_544MHz    0x00
  79 #define CLK_2_048MHz    0x01
  80 #define CLK_4_096MHz    0x02
  81 #define CLK_6_312MHz    0x03
  82 #define CLK_8_192MHz    0x04
  83 #define CLK_19_440MHz   0x06
  84
  85 #define CLK_8_592MHz    0x08
  86 #define CLK_11_184MHz   0x09
  87 #define CLK_34_368MHz   0x0b
  88 #define CLK_44_736MHz   0x0a
  89
  90 /* RECEIVED REFERENCE */
  91 #define AMC_B1 0
  92 #define AMC_B2 1
  93
  94 /* HARDWARE SWITCHING DEFINE */
  95 #define HW_ENABLE       0x80
  96 #define HW_DISABLE      0x00
  97
  98 /* HARDWARE SWITCHING MODE DEFINE */
  99 #define PLL_HOLDOVER    0x40
 100 #define LOST_CLOCK      0x00
 101
 102 /* ALARMS DEFINE */
 103 #define UNLOCK_MASK     0x10
 104 #define HOLDOVER_MASK   0x20
 105 #define SEC_LOST_MASK   0x40
 106 #define PRI_LOST_MASK   0x80
 107
 108 /* INTERRUPT CAUSE DEFINE */
 109
 110 #define PRI_LOS_01_MASK         0x01
 111 #define PRI_LOS_10_MASK         0x02
 112
 113 #define SEC_LOS_01_MASK         0x04
 114 #define SEC_LOS_10_MASK         0x08
 115
 116 #define HOLDOVER_01_MASK        0x10
 117 #define HOLDOVER_10_MASK        0x20
 118
 119 #define UNLOCK_01_MASK          0x40
 120 #define UNLOCK_10_MASK          0x80
 121
 122 struct tlclk_alarms {
 123         __u32 lost_clocks;
 124         __u32 lost_primary_clock;
 125         __u32 lost_secondary_clock;
 126         __u32 primary_clock_back;
 127         __u32 secondary_clock_back;
 128         __u32 switchover_primary;
 129         __u32 switchover_secondary;
 130         __u32 pll_holdover;
 131         __u32 pll_end_holdover;
 132         __u32 pll_lost_sync;
 133         __u32 pll_sync;
 134 };
 135 /* Telecom clock I/O register definition */
 136 #define TLCLK_BASE 0xa08
 137 #define TLCLK_REG0 TLCLK_BASE
 138 #define TLCLK_REG1 (TLCLK_BASE+1)
 139 #define TLCLK_REG2 (TLCLK_BASE+2)
 140 #define TLCLK_REG3 (TLCLK_BASE+3)
 141 #define TLCLK_REG4 (TLCLK_BASE+4)
 142 #define TLCLK_REG5 (TLCLK_BASE+5)
 143 #define TLCLK_REG6 (TLCLK_BASE+6)
 144 #define TLCLK_REG7 (TLCLK_BASE+7)
 145
 146 #define SET_PORT_BITS(port, mask, val) outb(((inb(port) & mask) | val), port)
 147
 148 /* 0 = Dynamic allocation of the major device number */
 149 #define TLCLK_MAJOR 0
 150
 151 /* sysfs interface definition:
 152 Upon loading the driver will create a sysfs directory under
 153 /sys/devices/platform/telco_clock.
 154
 155 This directory exports the following interfaces.  There operation is
 156 documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
 157 alarms                          :
 158 current_ref                     :
 159 received_ref_clk3a              :
 160 received_ref_clk3b              :
 161 enable_clk3a_output             :
 162 enable_clk3b_output             :
 163 enable_clka0_output             :
 164 enable_clka1_output             :
 165 enable_clkb0_output             :
 166 enable_clkb1_output             :
 167 filter_select                   :
 168 hardware_switching              :
 169 hardware_switching_mode         :
 170 telclock_version                :
 171 mode_select                     :
 172 refalign                        :
 173 reset                           :
 174 select_amcb1_transmit_clock     :
 175 select_amcb2_transmit_clock     :
 176 select_redundant_clock          :
 177 select_ref_frequency            :
 178
 179 All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
 180 has the same effect as echo 0x99 > refalign.
 181 */
 182
 183 static unsigned int telclk_interrupt;
 184
 185 static int int_events;          /* Event that generate a interrupt */
 186 static int got_event;           /* if events processing have been done */
 187
 188 static void switchover_timeout(struct timer_list *t);
 189 static struct timer_list switchover_timer;
 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         mutex_lock(&tlclk_mutex);
 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                              0, "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         mutex_unlock(&tlclk_mutex);
 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         .llseek = noop_llseek,
 271
 272 };
 273
 274 static struct miscdevice tlclk_miscdev = {
 275         .minor = MISC_DYNAMIC_MINOR,
 276         .name = "telco_clock",
 277         .fops = &tlclk_fops,
 278 };
 279
 280 static ssize_t show_current_ref(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_REG1) & 0x08) >> 3);
 288         spin_unlock_irqrestore(&event_lock, flags);
 289
 290         return sprintf(buf, "0x%lX\n", ret_val);
 291 }
 292
 293 static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
 294
 295
 296 static ssize_t show_telclock_version(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_REG5);
 304         spin_unlock_irqrestore(&event_lock, flags);
 305
 306         return sprintf(buf, "0x%lX\n", ret_val);
 307 }
 308
 309 static DEVICE_ATTR(telclock_version, S_IRUGO,
 310                 show_telclock_version, NULL);
 311
 312 static ssize_t show_alarms(struct device *d,
 313                 struct device_attribute *attr,  char *buf)
 314 {
 315         unsigned long ret_val;
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&event_lock, flags);
 319         ret_val = (inb(TLCLK_REG2) & 0xf0);
 320         spin_unlock_irqrestore(&event_lock, flags);
 321
 322         return sprintf(buf, "0x%lX\n", ret_val);
 323 }
 324
 325 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 326
 327 static ssize_t store_received_ref_clk3a(struct device *d,
 328                  struct device_attribute *attr, const char *buf, size_t count)
 329 {
 330         unsigned long tmp;
 331         unsigned char val;
 332         unsigned long flags;
 333
 334         sscanf(buf, "%lX", &tmp);
 335         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 336
 337         val = (unsigned char)tmp;
 338         spin_lock_irqsave(&event_lock, flags);
 339         SET_PORT_BITS(TLCLK_REG1, 0xef, val);
 340         spin_unlock_irqrestore(&event_lock, flags);
 341
 342         return strnlen(buf, count);
 343 }
 344
 345 static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
 346                 store_received_ref_clk3a);
 347
 348
 349 static ssize_t store_received_ref_clk3b(struct device *d,
 350                  struct device_attribute *attr, const char *buf, size_t count)
 351 {
 352         unsigned long tmp;
 353         unsigned char val;
 354         unsigned long flags;
 355
 356         sscanf(buf, "%lX", &tmp);
 357         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 358
 359         val = (unsigned char)tmp;
 360         spin_lock_irqsave(&event_lock, flags);
 361         SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
 362         spin_unlock_irqrestore(&event_lock, flags);
 363
 364         return strnlen(buf, count);
 365 }
 366
 367 static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
 368                 store_received_ref_clk3b);
 369
 370
 371 static ssize_t store_enable_clk3b_output(struct device *d,
 372                  struct device_attribute *attr, const char *buf, size_t count)
 373 {
 374         unsigned long tmp;
 375         unsigned char val;
 376         unsigned long flags;
 377
 378         sscanf(buf, "%lX", &tmp);
 379         dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 380
 381         val = (unsigned char)tmp;
 382         spin_lock_irqsave(&event_lock, flags);
 383         SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
 384         spin_unlock_irqrestore(&event_lock, flags);
 385
 386         return strnlen(buf, count);
 387 }
 388
 389 static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
 390                 store_enable_clk3b_output);
 391
 392 static ssize_t store_enable_clk3a_output(struct device *d,
 393                  struct device_attribute *attr, const char *buf, size_t count)
 394 {
 395         unsigned long flags;
 396         unsigned long tmp;
 397         unsigned char val;
 398
 399         sscanf(buf, "%lX", &tmp);
 400         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 401
 402         val = (unsigned char)tmp;
 403         spin_lock_irqsave(&event_lock, flags);
 404         SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
 405         spin_unlock_irqrestore(&event_lock, flags);
 406
 407         return strnlen(buf, count);
 408 }
 409
 410 static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
 411                 store_enable_clk3a_output);
 412
 413 static ssize_t store_enable_clkb1_output(struct device *d,
 414                  struct device_attribute *attr, const char *buf, size_t count)
 415 {
 416         unsigned long flags;
 417         unsigned long tmp;
 418         unsigned char val;
 419
 420         sscanf(buf, "%lX", &tmp);
 421         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 422
 423         val = (unsigned char)tmp;
 424         spin_lock_irqsave(&event_lock, flags);
 425         SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
 426         spin_unlock_irqrestore(&event_lock, flags);
 427
 428         return strnlen(buf, count);
 429 }
 430
 431 static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
 432                 store_enable_clkb1_output);
 433
 434
 435 static ssize_t store_enable_clka1_output(struct device *d,
 436                  struct device_attribute *attr, const char *buf, size_t count)
 437 {
 438         unsigned long flags;
 439         unsigned long tmp;
 440         unsigned char val;
 441
 442         sscanf(buf, "%lX", &tmp);
 443         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 444
 445         val = (unsigned char)tmp;
 446         spin_lock_irqsave(&event_lock, flags);
 447         SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
 448         spin_unlock_irqrestore(&event_lock, flags);
 449
 450         return strnlen(buf, count);
 451 }
 452
 453 static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
 454                 store_enable_clka1_output);
 455
 456 static ssize_t store_enable_clkb0_output(struct device *d,
 457                  struct device_attribute *attr, const char *buf, size_t count)
 458 {
 459         unsigned long flags;
 460         unsigned long tmp;
 461         unsigned char val;
 462
 463         sscanf(buf, "%lX", &tmp);
 464         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 465
 466         val = (unsigned char)tmp;
 467         spin_lock_irqsave(&event_lock, flags);
 468         SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
 469         spin_unlock_irqrestore(&event_lock, flags);
 470
 471         return strnlen(buf, count);
 472 }
 473
 474 static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
 475                 store_enable_clkb0_output);
 476
 477 static ssize_t store_enable_clka0_output(struct device *d,
 478                  struct device_attribute *attr, const char *buf, size_t count)
 479 {
 480         unsigned long flags;
 481         unsigned long tmp;
 482         unsigned char val;
 483
 484         sscanf(buf, "%lX", &tmp);
 485         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 486
 487         val = (unsigned char)tmp;
 488         spin_lock_irqsave(&event_lock, flags);
 489         SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
 490         spin_unlock_irqrestore(&event_lock, flags);
 491
 492         return strnlen(buf, count);
 493 }
 494
 495 static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
 496                 store_enable_clka0_output);
 497
 498 static ssize_t store_select_amcb2_transmit_clock(struct device *d,
 499                 struct device_attribute *attr, const char *buf, size_t count)
 500 {
 501         unsigned long flags;
 502         unsigned long tmp;
 503         unsigned char val;
 504
 505         sscanf(buf, "%lX", &tmp);
 506         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 507
 508         val = (unsigned char)tmp;
 509         spin_lock_irqsave(&event_lock, flags);
 510         if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 511                 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
 512                 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 513         } else if (val >= CLK_8_592MHz) {
 514                 SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
 515                 switch (val) {
 516                 case CLK_8_592MHz:
 517                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 518                         break;
 519                 case CLK_11_184MHz:
 520                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 521                         break;
 522                 case CLK_34_368MHz:
 523                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 524                         break;
 525                 case CLK_44_736MHz:
 526                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 527                         break;
 528                 }
 529         } else {
 530                 SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
 531         }
 532         spin_unlock_irqrestore(&event_lock, flags);
 533
 534         return strnlen(buf, count);
 535 }
 536
 537 static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 538         store_select_amcb2_transmit_clock);
 539
 540 static ssize_t store_select_amcb1_transmit_clock(struct device *d,
 541                  struct device_attribute *attr, const char *buf, size_t count)
 542 {
 543         unsigned long tmp;
 544         unsigned char val;
 545         unsigned long flags;
 546
 547         sscanf(buf, "%lX", &tmp);
 548         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 549
 550         val = (unsigned char)tmp;
 551         spin_lock_irqsave(&event_lock, flags);
 552         if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 553                 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
 554                 SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 555         } else if (val >= CLK_8_592MHz) {
 556                 SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
 557                 switch (val) {
 558                 case CLK_8_592MHz:
 559                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 560                         break;
 561                 case CLK_11_184MHz:
 562                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 563                         break;
 564                 case CLK_34_368MHz:
 565                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 566                         break;
 567                 case CLK_44_736MHz:
 568                         SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 569                         break;
 570                 }
 571         } else {
 572                 SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
 573         }
 574         spin_unlock_irqrestore(&event_lock, flags);
 575
 576         return strnlen(buf, count);
 577 }
 578
 579 static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 580                 store_select_amcb1_transmit_clock);
 581
 582 static ssize_t store_select_redundant_clock(struct device *d,
 583                  struct device_attribute *attr, const char *buf, size_t count)
 584 {
 585         unsigned long tmp;
 586         unsigned char val;
 587         unsigned long flags;
 588
 589         sscanf(buf, "%lX", &tmp);
 590         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 591
 592         val = (unsigned char)tmp;
 593         spin_lock_irqsave(&event_lock, flags);
 594         SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
 595         spin_unlock_irqrestore(&event_lock, flags);
 596
 597         return strnlen(buf, count);
 598 }
 599
 600 static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
 601                 store_select_redundant_clock);
 602
 603 static ssize_t store_select_ref_frequency(struct device *d,
 604                  struct device_attribute *attr, const char *buf, size_t count)
 605 {
 606         unsigned long tmp;
 607         unsigned char val;
 608         unsigned long flags;
 609
 610         sscanf(buf, "%lX", &tmp);
 611         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 612
 613         val = (unsigned char)tmp;
 614         spin_lock_irqsave(&event_lock, flags);
 615         SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
 616         spin_unlock_irqrestore(&event_lock, flags);
 617
 618         return strnlen(buf, count);
 619 }
 620
 621 static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
 622                 store_select_ref_frequency);
 623
 624 static ssize_t store_filter_select(struct device *d,
 625                  struct device_attribute *attr, const char *buf, size_t count)
 626 {
 627         unsigned long tmp;
 628         unsigned char val;
 629         unsigned long flags;
 630
 631         sscanf(buf, "%lX", &tmp);
 632         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 633
 634         val = (unsigned char)tmp;
 635         spin_lock_irqsave(&event_lock, flags);
 636         SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
 637         spin_unlock_irqrestore(&event_lock, flags);
 638
 639         return strnlen(buf, count);
 640 }
 641
 642 static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
 643
 644 static ssize_t store_hardware_switching_mode(struct device *d,
 645                  struct device_attribute *attr, const char *buf, size_t count)
 646 {
 647         unsigned long tmp;
 648         unsigned char val;
 649         unsigned long flags;
 650
 651         sscanf(buf, "%lX", &tmp);
 652         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 653
 654         val = (unsigned char)tmp;
 655         spin_lock_irqsave(&event_lock, flags);
 656         SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
 657         spin_unlock_irqrestore(&event_lock, flags);
 658
 659         return strnlen(buf, count);
 660 }
 661
 662 static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
 663                 store_hardware_switching_mode);
 664
 665 static ssize_t store_hardware_switching(struct device *d,
 666                  struct device_attribute *attr, const char *buf, size_t count)
 667 {
 668         unsigned long tmp;
 669         unsigned char val;
 670         unsigned long flags;
 671
 672         sscanf(buf, "%lX", &tmp);
 673         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 674
 675         val = (unsigned char)tmp;
 676         spin_lock_irqsave(&event_lock, flags);
 677         SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
 678         spin_unlock_irqrestore(&event_lock, flags);
 679
 680         return strnlen(buf, count);
 681 }
 682
 683 static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
 684                 store_hardware_switching);
 685
 686 static ssize_t store_refalign (struct device *d,
 687                  struct device_attribute *attr, const char *buf, size_t count)
 688 {
 689         unsigned long tmp;
 690         unsigned long flags;
 691
 692         sscanf(buf, "%lX", &tmp);
 693         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 694         spin_lock_irqsave(&event_lock, flags);
 695         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 696         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
 697         SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 698         spin_unlock_irqrestore(&event_lock, flags);
 699
 700         return strnlen(buf, count);
 701 }
 702
 703 static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
 704
 705 static ssize_t store_mode_select (struct device *d,
 706                  struct device_attribute *attr, const char *buf, size_t count)
 707 {
 708         unsigned long tmp;
 709         unsigned char val;
 710         unsigned long flags;
 711
 712         sscanf(buf, "%lX", &tmp);
 713         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 714
 715         val = (unsigned char)tmp;
 716         spin_lock_irqsave(&event_lock, flags);
 717         SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
 718         spin_unlock_irqrestore(&event_lock, flags);
 719
 720         return strnlen(buf, count);
 721 }
 722
 723 static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
 724
 725 static ssize_t store_reset (struct device *d,
 726                  struct device_attribute *attr, const char *buf, size_t count)
 727 {
 728         unsigned long tmp;
 729         unsigned char val;
 730         unsigned long flags;
 731
 732         sscanf(buf, "%lX", &tmp);
 733         dev_dbg(d, "tmp = 0x%lX\n", tmp);
 734
 735         val = (unsigned char)tmp;
 736         spin_lock_irqsave(&event_lock, flags);
 737         SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
 738         spin_unlock_irqrestore(&event_lock, flags);
 739
 740         return strnlen(buf, count);
 741 }
 742
 743 static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
 744
 745 static struct attribute *tlclk_sysfs_entries[] = {
 746         &dev_attr_current_ref.attr,
 747         &dev_attr_telclock_version.attr,
 748         &dev_attr_alarms.attr,
 749         &dev_attr_received_ref_clk3a.attr,
 750         &dev_attr_received_ref_clk3b.attr,
 751         &dev_attr_enable_clk3a_output.attr,
 752         &dev_attr_enable_clk3b_output.attr,
 753         &dev_attr_enable_clkb1_output.attr,
 754         &dev_attr_enable_clka1_output.attr,
 755         &dev_attr_enable_clkb0_output.attr,
 756         &dev_attr_enable_clka0_output.attr,
 757         &dev_attr_select_amcb1_transmit_clock.attr,
 758         &dev_attr_select_amcb2_transmit_clock.attr,
 759         &dev_attr_select_redundant_clock.attr,
 760         &dev_attr_select_ref_frequency.attr,
 761         &dev_attr_filter_select.attr,
 762         &dev_attr_hardware_switching_mode.attr,
 763         &dev_attr_hardware_switching.attr,
 764         &dev_attr_refalign.attr,
 765         &dev_attr_mode_select.attr,
 766         &dev_attr_reset.attr,
 767         NULL
 768 };
 769
 770 static const struct attribute_group tlclk_attribute_group = {
 771         .name = NULL,           /* put in device directory */
 772         .attrs = tlclk_sysfs_entries,
 773 };
 774
 775 static struct platform_device *tlclk_device;
 776
 777 static int __init tlclk_init(void)
 778 {
 779         int ret;
 780
 781         telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 782
 783         alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
 784         if (!alarm_events) {
 785                 ret = -ENOMEM;
 786                 goto out1;
 787         }
 788
 789         ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
 790         if (ret < 0) {
 791                 printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
 792                 kfree(alarm_events);
 793                 return ret;
 794         }
 795         tlclk_major = ret;
 796
 797         /* Read telecom clock IRQ number (Set by BIOS) */
 798         if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 799                 printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
 800                         TLCLK_BASE);
 801                 ret = -EBUSY;
 802                 goto out2;
 803         }
 804
 805         if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
 806                 printk(KERN_ERR "telclk_interrupt = 0x%x non-mcpbl0010 hw.\n",
 807                         telclk_interrupt);
 808                 ret = -ENXIO;
 809                 goto out3;
 810         }
 811
 812         timer_setup(&switchover_timer, switchover_timeout, 0);
 813
 814         ret = misc_register(&tlclk_miscdev);
 815         if (ret < 0) {
 816                 printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
 817                 goto out3;
 818         }
 819
 820         tlclk_device = platform_device_register_simple("telco_clock",
 821                                 -1, NULL, 0);
 822         if (IS_ERR(tlclk_device)) {
 823                 printk(KERN_ERR "tlclk: platform_device_register failed.\n");
 824                 ret = PTR_ERR(tlclk_device);
 825                 goto out4;
 826         }
 827
 828         ret = sysfs_create_group(&tlclk_device->dev.kobj,
 829                         &tlclk_attribute_group);
 830         if (ret) {
 831                 printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
 832                 goto out5;
 833         }
 834
 835         return 0;
 836 out5:
 837         platform_device_unregister(tlclk_device);
 838 out4:
 839         misc_deregister(&tlclk_miscdev);
 840 out3:
 841         release_region(TLCLK_BASE, 8);
 842 out2:
 843         kfree(alarm_events);
 844         unregister_chrdev(tlclk_major, "telco_clock");
 845 out1:
 846         return ret;
 847 }
 848
 849 static void __exit tlclk_cleanup(void)
 850 {
 851         sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
 852         platform_device_unregister(tlclk_device);
 853         misc_deregister(&tlclk_miscdev);
 854         unregister_chrdev(tlclk_major, "telco_clock");
 855
 856         release_region(TLCLK_BASE, 8);
 857         del_timer_sync(&switchover_timer);
 858         kfree(alarm_events);
 859
 860 }
 861
 862 static void switchover_timeout(struct timer_list *unused)
 863 {
 864         unsigned long flags = tlclk_timer_data;
 865
 866         if ((flags & 1)) {
 867                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 868                         alarm_events->switchover_primary++;
 869         } else {
 870                 if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 871                         alarm_events->switchover_secondary++;
 872         }
 873
 874         /* Alarm processing is done, wake up read task */
 875         del_timer(&switchover_timer);
 876         got_event = 1;
 877         wake_up(&wq);
 878 }
 879
 880 static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
 881 {
 882         unsigned long flags;
 883
 884         spin_lock_irqsave(&event_lock, flags);
 885         /* Read and clear interrupt events */
 886         int_events = inb(TLCLK_REG6);
 887
 888         /* Primary_Los changed from 0 to 1 ? */
 889         if (int_events & PRI_LOS_01_MASK) {
 890                 if (inb(TLCLK_REG2) & SEC_LOST_MASK)
 891                         alarm_events->lost_clocks++;
 892                 else
 893                         alarm_events->lost_primary_clock++;
 894         }
 895
 896         /* Primary_Los changed from 1 to 0 ? */
 897         if (int_events & PRI_LOS_10_MASK) {
 898                 alarm_events->primary_clock_back++;
 899                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
 900         }
 901         /* Secondary_Los changed from 0 to 1 ? */
 902         if (int_events & SEC_LOS_01_MASK) {
 903                 if (inb(TLCLK_REG2) & PRI_LOST_MASK)
 904                         alarm_events->lost_clocks++;
 905                 else
 906                         alarm_events->lost_secondary_clock++;
 907         }
 908         /* Secondary_Los changed from 1 to 0 ? */
 909         if (int_events & SEC_LOS_10_MASK) {
 910                 alarm_events->secondary_clock_back++;
 911                 SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
 912         }
 913         if (int_events & HOLDOVER_10_MASK)
 914                 alarm_events->pll_end_holdover++;
 915
 916         if (int_events & UNLOCK_01_MASK)
 917                 alarm_events->pll_lost_sync++;
 918
 919         if (int_events & UNLOCK_10_MASK)
 920                 alarm_events->pll_sync++;
 921
 922         /* Holdover changed from 0 to 1 ? */
 923         if (int_events & HOLDOVER_01_MASK) {
 924                 alarm_events->pll_holdover++;
 925
 926                 /* TIMEOUT in ~10ms */
 927                 switchover_timer.expires = jiffies + msecs_to_jiffies(10);
 928                 tlclk_timer_data = inb(TLCLK_REG1);
 929                 mod_timer(&switchover_timer, switchover_timer.expires);
 930         } else {
 931                 got_event = 1;
 932                 wake_up(&wq);
 933         }
 934         spin_unlock_irqrestore(&event_lock, flags);
 935
 936         return IRQ_HANDLED;
 937 }
 938
 939 module_init(tlclk_init);
 940 module_exit(tlclk_cleanup);