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