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