linux/drivers/char/tlclk.c
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   1/*
   2 * Telecom Clock driver for Intel NetStructure(tm) MPCBL0010
   3 *
   4 * Copyright (C) 2005 Kontron Canada
   5 *
   6 * All rights reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or (at
  11 * your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  16 * NON INFRINGEMENT.  See the GNU General Public License for more
  17 * details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 *
  23 * Send feedback to <sebastien.bouchard@ca.kontron.com> and the current
  24 * Maintainer  <mark.gross@intel.com>
  25 *
  26 * Description : This is the TELECOM CLOCK module driver for the ATCA
  27 * MPCBL0010 ATCA computer.
  28 */
  29
  30#include <linux/module.h>
  31#include <linux/init.h>
  32#include <linux/kernel.h>       /* printk() */
  33#include <linux/fs.h>           /* everything... */
  34#include <linux/errno.h>        /* error codes */
  35#include <linux/sched.h>
  36#include <linux/slab.h>
  37#include <linux/ioport.h>
  38#include <linux/interrupt.h>
  39#include <linux/spinlock.h>
  40#include <linux/smp_lock.h>
  41#include <linux/timer.h>
  42#include <linux/sysfs.h>
  43#include <linux/device.h>
  44#include <linux/miscdevice.h>
  45#include <linux/platform_device.h>
  46#include <asm/io.h>             /* inb/outb */
  47#include <asm/uaccess.h>
  48
  49MODULE_AUTHOR("Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>");
  50MODULE_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
 121struct 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:
 151Upon loading the driver will create a sysfs directory under
 152/sys/devices/platform/telco_clock.
 153
 154This directory exports the following interfaces.  There operation is
 155documented in the MCPBL0010 TPS under the Telecom Clock API section, 11.4.
 156alarms                          :
 157current_ref                     :
 158received_ref_clk3a              :
 159received_ref_clk3b              :
 160enable_clk3a_output             :
 161enable_clk3b_output             :
 162enable_clka0_output             :
 163enable_clka1_output             :
 164enable_clkb0_output             :
 165enable_clkb1_output             :
 166filter_select                   :
 167hardware_switching              :
 168hardware_switching_mode         :
 169telclock_version                :
 170mode_select                     :
 171refalign                        :
 172reset                           :
 173select_amcb1_transmit_clock     :
 174select_amcb2_transmit_clock     :
 175select_redundant_clock          :
 176select_ref_frequency            :
 177
 178All sysfs interfaces are integers in hex format, i.e echo 99 > refalign
 179has the same effect as echo 0x99 > refalign.
 180*/
 181
 182static unsigned int telclk_interrupt;
 183
 184static int int_events;          /* Event that generate a interrupt */
 185static int got_event;           /* if events processing have been done */
 186
 187static void switchover_timeout(unsigned long data);
 188static struct timer_list switchover_timer =
 189        TIMER_INITIALIZER(switchover_timeout , 0, 0);
 190static unsigned long tlclk_timer_data;
 191
 192static struct tlclk_alarms *alarm_events;
 193
 194static DEFINE_SPINLOCK(event_lock);
 195
 196static int tlclk_major = TLCLK_MAJOR;
 197
 198static irqreturn_t tlclk_interrupt(int irq, void *dev_id);
 199
 200static DECLARE_WAIT_QUEUE_HEAD(wq);
 201
 202static unsigned long useflags;
 203static DEFINE_MUTEX(tlclk_mutex);
 204
 205static int tlclk_open(struct inode *inode, struct file *filp)
 206{
 207        int result;
 208
 209        lock_kernel();
 210        if (test_and_set_bit(0, &useflags)) {
 211                result = -EBUSY;
 212                /* this legacy device is always one per system and it doesn't
 213                 * know how to handle multiple concurrent clients.
 214                 */
 215                goto out;
 216        }
 217
 218        /* Make sure there is no interrupt pending while
 219         * initialising interrupt handler */
 220        inb(TLCLK_REG6);
 221
 222        /* This device is wired through the FPGA IO space of the ATCA blade
 223         * we can't share this IRQ */
 224        result = request_irq(telclk_interrupt, &tlclk_interrupt,
 225                             IRQF_DISABLED, "telco_clock", tlclk_interrupt);
 226        if (result == -EBUSY)
 227                printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
 228        else
 229                inb(TLCLK_REG6);        /* Clear interrupt events */
 230
 231out:
 232        unlock_kernel();
 233        return result;
 234}
 235
 236static 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
 244static 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
 266static const struct file_operations tlclk_fops = {
 267        .read = tlclk_read,
 268        .open = tlclk_open,
 269        .release = tlclk_release,
 270
 271};
 272
 273static struct miscdevice tlclk_miscdev = {
 274        .minor = MISC_DYNAMIC_MINOR,
 275        .name = "telco_clock",
 276        .fops = &tlclk_fops,
 277};
 278
 279static ssize_t show_current_ref(struct device *d,
 280                struct device_attribute *attr, char *buf)
 281{
 282        unsigned long ret_val;
 283        unsigned long flags;
 284
 285        spin_lock_irqsave(&event_lock, flags);
 286        ret_val = ((inb(TLCLK_REG1) & 0x08) >> 3);
 287        spin_unlock_irqrestore(&event_lock, flags);
 288
 289        return sprintf(buf, "0x%lX\n", ret_val);
 290}
 291
 292static DEVICE_ATTR(current_ref, S_IRUGO, show_current_ref, NULL);
 293
 294
 295static ssize_t show_telclock_version(struct device *d,
 296                struct device_attribute *attr, char *buf)
 297{
 298        unsigned long ret_val;
 299        unsigned long flags;
 300
 301        spin_lock_irqsave(&event_lock, flags);
 302        ret_val = inb(TLCLK_REG5);
 303        spin_unlock_irqrestore(&event_lock, flags);
 304
 305        return sprintf(buf, "0x%lX\n", ret_val);
 306}
 307
 308static DEVICE_ATTR(telclock_version, S_IRUGO,
 309                show_telclock_version, NULL);
 310
 311static ssize_t show_alarms(struct device *d,
 312                struct device_attribute *attr,  char *buf)
 313{
 314        unsigned long ret_val;
 315        unsigned long flags;
 316
 317        spin_lock_irqsave(&event_lock, flags);
 318        ret_val = (inb(TLCLK_REG2) & 0xf0);
 319        spin_unlock_irqrestore(&event_lock, flags);
 320
 321        return sprintf(buf, "0x%lX\n", ret_val);
 322}
 323
 324static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 325
 326static ssize_t store_received_ref_clk3a(struct device *d,
 327                 struct device_attribute *attr, const char *buf, size_t count)
 328{
 329        unsigned long tmp;
 330        unsigned char val;
 331        unsigned long flags;
 332
 333        sscanf(buf, "%lX", &tmp);
 334        dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 335
 336        val = (unsigned char)tmp;
 337        spin_lock_irqsave(&event_lock, flags);
 338        SET_PORT_BITS(TLCLK_REG1, 0xef, val);
 339        spin_unlock_irqrestore(&event_lock, flags);
 340
 341        return strnlen(buf, count);
 342}
 343
 344static DEVICE_ATTR(received_ref_clk3a, (S_IWUSR|S_IWGRP), NULL,
 345                store_received_ref_clk3a);
 346
 347
 348static ssize_t store_received_ref_clk3b(struct device *d,
 349                 struct device_attribute *attr, const char *buf, size_t count)
 350{
 351        unsigned long tmp;
 352        unsigned char val;
 353        unsigned long flags;
 354
 355        sscanf(buf, "%lX", &tmp);
 356        dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 357
 358        val = (unsigned char)tmp;
 359        spin_lock_irqsave(&event_lock, flags);
 360        SET_PORT_BITS(TLCLK_REG1, 0xdf, val << 1);
 361        spin_unlock_irqrestore(&event_lock, flags);
 362
 363        return strnlen(buf, count);
 364}
 365
 366static DEVICE_ATTR(received_ref_clk3b, (S_IWUSR|S_IWGRP), NULL,
 367                store_received_ref_clk3b);
 368
 369
 370static ssize_t store_enable_clk3b_output(struct device *d,
 371                 struct device_attribute *attr, const char *buf, size_t count)
 372{
 373        unsigned long tmp;
 374        unsigned char val;
 375        unsigned long flags;
 376
 377        sscanf(buf, "%lX", &tmp);
 378        dev_dbg(d, ": tmp = 0x%lX\n", tmp);
 379
 380        val = (unsigned char)tmp;
 381        spin_lock_irqsave(&event_lock, flags);
 382        SET_PORT_BITS(TLCLK_REG3, 0x7f, val << 7);
 383        spin_unlock_irqrestore(&event_lock, flags);
 384
 385        return strnlen(buf, count);
 386}
 387
 388static DEVICE_ATTR(enable_clk3b_output, (S_IWUSR|S_IWGRP), NULL,
 389                store_enable_clk3b_output);
 390
 391static ssize_t store_enable_clk3a_output(struct device *d,
 392                 struct device_attribute *attr, const char *buf, size_t count)
 393{
 394        unsigned long flags;
 395        unsigned long tmp;
 396        unsigned char val;
 397
 398        sscanf(buf, "%lX", &tmp);
 399        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 400
 401        val = (unsigned char)tmp;
 402        spin_lock_irqsave(&event_lock, flags);
 403        SET_PORT_BITS(TLCLK_REG3, 0xbf, val << 6);
 404        spin_unlock_irqrestore(&event_lock, flags);
 405
 406        return strnlen(buf, count);
 407}
 408
 409static DEVICE_ATTR(enable_clk3a_output, (S_IWUSR|S_IWGRP), NULL,
 410                store_enable_clk3a_output);
 411
 412static ssize_t store_enable_clkb1_output(struct device *d,
 413                 struct device_attribute *attr, const char *buf, size_t count)
 414{
 415        unsigned long flags;
 416        unsigned long tmp;
 417        unsigned char val;
 418
 419        sscanf(buf, "%lX", &tmp);
 420        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 421
 422        val = (unsigned char)tmp;
 423        spin_lock_irqsave(&event_lock, flags);
 424        SET_PORT_BITS(TLCLK_REG2, 0xf7, val << 3);
 425        spin_unlock_irqrestore(&event_lock, flags);
 426
 427        return strnlen(buf, count);
 428}
 429
 430static DEVICE_ATTR(enable_clkb1_output, (S_IWUSR|S_IWGRP), NULL,
 431                store_enable_clkb1_output);
 432
 433
 434static ssize_t store_enable_clka1_output(struct device *d,
 435                 struct device_attribute *attr, const char *buf, size_t count)
 436{
 437        unsigned long flags;
 438        unsigned long tmp;
 439        unsigned char val;
 440
 441        sscanf(buf, "%lX", &tmp);
 442        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 443
 444        val = (unsigned char)tmp;
 445        spin_lock_irqsave(&event_lock, flags);
 446        SET_PORT_BITS(TLCLK_REG2, 0xfb, val << 2);
 447        spin_unlock_irqrestore(&event_lock, flags);
 448
 449        return strnlen(buf, count);
 450}
 451
 452static DEVICE_ATTR(enable_clka1_output, (S_IWUSR|S_IWGRP), NULL,
 453                store_enable_clka1_output);
 454
 455static ssize_t store_enable_clkb0_output(struct device *d,
 456                 struct device_attribute *attr, const char *buf, size_t count)
 457{
 458        unsigned long flags;
 459        unsigned long tmp;
 460        unsigned char val;
 461
 462        sscanf(buf, "%lX", &tmp);
 463        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 464
 465        val = (unsigned char)tmp;
 466        spin_lock_irqsave(&event_lock, flags);
 467        SET_PORT_BITS(TLCLK_REG2, 0xfd, val << 1);
 468        spin_unlock_irqrestore(&event_lock, flags);
 469
 470        return strnlen(buf, count);
 471}
 472
 473static DEVICE_ATTR(enable_clkb0_output, (S_IWUSR|S_IWGRP), NULL,
 474                store_enable_clkb0_output);
 475
 476static ssize_t store_enable_clka0_output(struct device *d,
 477                 struct device_attribute *attr, const char *buf, size_t count)
 478{
 479        unsigned long flags;
 480        unsigned long tmp;
 481        unsigned char val;
 482
 483        sscanf(buf, "%lX", &tmp);
 484        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 485
 486        val = (unsigned char)tmp;
 487        spin_lock_irqsave(&event_lock, flags);
 488        SET_PORT_BITS(TLCLK_REG2, 0xfe, val);
 489        spin_unlock_irqrestore(&event_lock, flags);
 490
 491        return strnlen(buf, count);
 492}
 493
 494static DEVICE_ATTR(enable_clka0_output, (S_IWUSR|S_IWGRP), NULL,
 495                store_enable_clka0_output);
 496
 497static ssize_t store_select_amcb2_transmit_clock(struct device *d,
 498                struct device_attribute *attr, const char *buf, size_t count)
 499{
 500        unsigned long flags;
 501        unsigned long tmp;
 502        unsigned char val;
 503
 504        sscanf(buf, "%lX", &tmp);
 505        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 506
 507        val = (unsigned char)tmp;
 508        spin_lock_irqsave(&event_lock, flags);
 509                if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 510                        SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x28);
 511                        SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 512                } else if (val >= CLK_8_592MHz) {
 513                        SET_PORT_BITS(TLCLK_REG3, 0xc7, 0x38);
 514                        switch (val) {
 515                        case CLK_8_592MHz:
 516                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 517                                break;
 518                        case CLK_11_184MHz:
 519                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 520                                break;
 521                        case CLK_34_368MHz:
 522                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 523                                break;
 524                        case CLK_44_736MHz:
 525                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 526                                break;
 527                        }
 528                } else
 529                        SET_PORT_BITS(TLCLK_REG3, 0xc7, val << 3);
 530
 531        spin_unlock_irqrestore(&event_lock, flags);
 532
 533        return strnlen(buf, count);
 534}
 535
 536static DEVICE_ATTR(select_amcb2_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 537        store_select_amcb2_transmit_clock);
 538
 539static ssize_t store_select_amcb1_transmit_clock(struct device *d,
 540                 struct device_attribute *attr, const char *buf, size_t count)
 541{
 542        unsigned long tmp;
 543        unsigned char val;
 544        unsigned long flags;
 545
 546        sscanf(buf, "%lX", &tmp);
 547        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 548
 549        val = (unsigned char)tmp;
 550        spin_lock_irqsave(&event_lock, flags);
 551                if ((val == CLK_8kHz) || (val == CLK_16_384MHz)) {
 552                        SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x5);
 553                        SET_PORT_BITS(TLCLK_REG1, 0xfb, ~val);
 554                } else if (val >= CLK_8_592MHz) {
 555                        SET_PORT_BITS(TLCLK_REG3, 0xf8, 0x7);
 556                        switch (val) {
 557                        case CLK_8_592MHz:
 558                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 2);
 559                                break;
 560                        case CLK_11_184MHz:
 561                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 0);
 562                                break;
 563                        case CLK_34_368MHz:
 564                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 3);
 565                                break;
 566                        case CLK_44_736MHz:
 567                                SET_PORT_BITS(TLCLK_REG0, 0xfc, 1);
 568                                break;
 569                        }
 570                } else
 571                        SET_PORT_BITS(TLCLK_REG3, 0xf8, val);
 572        spin_unlock_irqrestore(&event_lock, flags);
 573
 574        return strnlen(buf, count);
 575}
 576
 577static DEVICE_ATTR(select_amcb1_transmit_clock, (S_IWUSR|S_IWGRP), NULL,
 578                store_select_amcb1_transmit_clock);
 579
 580static ssize_t store_select_redundant_clock(struct device *d,
 581                 struct device_attribute *attr, const char *buf, size_t count)
 582{
 583        unsigned long tmp;
 584        unsigned char val;
 585        unsigned long flags;
 586
 587        sscanf(buf, "%lX", &tmp);
 588        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 589
 590        val = (unsigned char)tmp;
 591        spin_lock_irqsave(&event_lock, flags);
 592        SET_PORT_BITS(TLCLK_REG1, 0xfe, val);
 593        spin_unlock_irqrestore(&event_lock, flags);
 594
 595        return strnlen(buf, count);
 596}
 597
 598static DEVICE_ATTR(select_redundant_clock, (S_IWUSR|S_IWGRP), NULL,
 599                store_select_redundant_clock);
 600
 601static ssize_t store_select_ref_frequency(struct device *d,
 602                 struct device_attribute *attr, const char *buf, size_t count)
 603{
 604        unsigned long tmp;
 605        unsigned char val;
 606        unsigned long flags;
 607
 608        sscanf(buf, "%lX", &tmp);
 609        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 610
 611        val = (unsigned char)tmp;
 612        spin_lock_irqsave(&event_lock, flags);
 613        SET_PORT_BITS(TLCLK_REG1, 0xfd, val);
 614        spin_unlock_irqrestore(&event_lock, flags);
 615
 616        return strnlen(buf, count);
 617}
 618
 619static DEVICE_ATTR(select_ref_frequency, (S_IWUSR|S_IWGRP), NULL,
 620                store_select_ref_frequency);
 621
 622static ssize_t store_filter_select(struct device *d,
 623                 struct device_attribute *attr, const char *buf, size_t count)
 624{
 625        unsigned long tmp;
 626        unsigned char val;
 627        unsigned long flags;
 628
 629        sscanf(buf, "%lX", &tmp);
 630        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 631
 632        val = (unsigned char)tmp;
 633        spin_lock_irqsave(&event_lock, flags);
 634        SET_PORT_BITS(TLCLK_REG0, 0xfb, val);
 635        spin_unlock_irqrestore(&event_lock, flags);
 636
 637        return strnlen(buf, count);
 638}
 639
 640static DEVICE_ATTR(filter_select, (S_IWUSR|S_IWGRP), NULL, store_filter_select);
 641
 642static ssize_t store_hardware_switching_mode(struct device *d,
 643                 struct device_attribute *attr, const char *buf, size_t count)
 644{
 645        unsigned long tmp;
 646        unsigned char val;
 647        unsigned long flags;
 648
 649        sscanf(buf, "%lX", &tmp);
 650        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 651
 652        val = (unsigned char)tmp;
 653        spin_lock_irqsave(&event_lock, flags);
 654        SET_PORT_BITS(TLCLK_REG0, 0xbf, val);
 655        spin_unlock_irqrestore(&event_lock, flags);
 656
 657        return strnlen(buf, count);
 658}
 659
 660static DEVICE_ATTR(hardware_switching_mode, (S_IWUSR|S_IWGRP), NULL,
 661                store_hardware_switching_mode);
 662
 663static ssize_t store_hardware_switching(struct device *d,
 664                 struct device_attribute *attr, const char *buf, size_t count)
 665{
 666        unsigned long tmp;
 667        unsigned char val;
 668        unsigned long flags;
 669
 670        sscanf(buf, "%lX", &tmp);
 671        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 672
 673        val = (unsigned char)tmp;
 674        spin_lock_irqsave(&event_lock, flags);
 675        SET_PORT_BITS(TLCLK_REG0, 0x7f, val);
 676        spin_unlock_irqrestore(&event_lock, flags);
 677
 678        return strnlen(buf, count);
 679}
 680
 681static DEVICE_ATTR(hardware_switching, (S_IWUSR|S_IWGRP), NULL,
 682                store_hardware_switching);
 683
 684static ssize_t store_refalign (struct device *d,
 685                 struct device_attribute *attr, const char *buf, size_t count)
 686{
 687        unsigned long tmp;
 688        unsigned long flags;
 689
 690        sscanf(buf, "%lX", &tmp);
 691        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 692        spin_lock_irqsave(&event_lock, flags);
 693        SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 694        SET_PORT_BITS(TLCLK_REG0, 0xf7, 0x08);
 695        SET_PORT_BITS(TLCLK_REG0, 0xf7, 0);
 696        spin_unlock_irqrestore(&event_lock, flags);
 697
 698        return strnlen(buf, count);
 699}
 700
 701static DEVICE_ATTR(refalign, (S_IWUSR|S_IWGRP), NULL, store_refalign);
 702
 703static ssize_t store_mode_select (struct device *d,
 704                 struct device_attribute *attr, const char *buf, size_t count)
 705{
 706        unsigned long tmp;
 707        unsigned char val;
 708        unsigned long flags;
 709
 710        sscanf(buf, "%lX", &tmp);
 711        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 712
 713        val = (unsigned char)tmp;
 714        spin_lock_irqsave(&event_lock, flags);
 715        SET_PORT_BITS(TLCLK_REG0, 0xcf, val);
 716        spin_unlock_irqrestore(&event_lock, flags);
 717
 718        return strnlen(buf, count);
 719}
 720
 721static DEVICE_ATTR(mode_select, (S_IWUSR|S_IWGRP), NULL, store_mode_select);
 722
 723static ssize_t store_reset (struct device *d,
 724                 struct device_attribute *attr, const char *buf, size_t count)
 725{
 726        unsigned long tmp;
 727        unsigned char val;
 728        unsigned long flags;
 729
 730        sscanf(buf, "%lX", &tmp);
 731        dev_dbg(d, "tmp = 0x%lX\n", tmp);
 732
 733        val = (unsigned char)tmp;
 734        spin_lock_irqsave(&event_lock, flags);
 735        SET_PORT_BITS(TLCLK_REG4, 0xfd, val);
 736        spin_unlock_irqrestore(&event_lock, flags);
 737
 738        return strnlen(buf, count);
 739}
 740
 741static DEVICE_ATTR(reset, (S_IWUSR|S_IWGRP), NULL, store_reset);
 742
 743static struct attribute *tlclk_sysfs_entries[] = {
 744        &dev_attr_current_ref.attr,
 745        &dev_attr_telclock_version.attr,
 746        &dev_attr_alarms.attr,
 747        &dev_attr_received_ref_clk3a.attr,
 748        &dev_attr_received_ref_clk3b.attr,
 749        &dev_attr_enable_clk3a_output.attr,
 750        &dev_attr_enable_clk3b_output.attr,
 751        &dev_attr_enable_clkb1_output.attr,
 752        &dev_attr_enable_clka1_output.attr,
 753        &dev_attr_enable_clkb0_output.attr,
 754        &dev_attr_enable_clka0_output.attr,
 755        &dev_attr_select_amcb1_transmit_clock.attr,
 756        &dev_attr_select_amcb2_transmit_clock.attr,
 757        &dev_attr_select_redundant_clock.attr,
 758        &dev_attr_select_ref_frequency.attr,
 759        &dev_attr_filter_select.attr,
 760        &dev_attr_hardware_switching_mode.attr,
 761        &dev_attr_hardware_switching.attr,
 762        &dev_attr_refalign.attr,
 763        &dev_attr_mode_select.attr,
 764        &dev_attr_reset.attr,
 765        NULL
 766};
 767
 768static struct attribute_group tlclk_attribute_group = {
 769        .name = NULL,           /* put in device directory */
 770        .attrs = tlclk_sysfs_entries,
 771};
 772
 773static struct platform_device *tlclk_device;
 774
 775static int __init tlclk_init(void)
 776{
 777        int ret;
 778
 779        ret = register_chrdev(tlclk_major, "telco_clock", &tlclk_fops);
 780        if (ret < 0) {
 781                printk(KERN_ERR "tlclk: can't get major %d.\n", tlclk_major);
 782                return ret;
 783        }
 784        tlclk_major = ret;
 785        alarm_events = kzalloc( sizeof(struct tlclk_alarms), GFP_KERNEL);
 786        if (!alarm_events)
 787                goto out1;
 788
 789        /* Read telecom clock IRQ number (Set by BIOS) */
 790        if (!request_region(TLCLK_BASE, 8, "telco_clock")) {
 791                printk(KERN_ERR "tlclk: request_region 0x%X failed.\n",
 792                        TLCLK_BASE);
 793                ret = -EBUSY;
 794                goto out2;
 795        }
 796        telclk_interrupt = (inb(TLCLK_REG7) & 0x0f);
 797
 798        if (0x0F == telclk_interrupt ) { /* not MCPBL0010 ? */
 799                printk(KERN_ERR "telclk_interrup = 0x%x non-mcpbl0010 hw.\n",
 800                        telclk_interrupt);
 801                ret = -ENXIO;
 802                goto out3;
 803        }
 804
 805        init_timer(&switchover_timer);
 806
 807        ret = misc_register(&tlclk_miscdev);
 808        if (ret < 0) {
 809                printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
 810                goto out3;
 811        }
 812
 813        tlclk_device = platform_device_register_simple("telco_clock",
 814                                -1, NULL, 0);
 815        if (IS_ERR(tlclk_device)) {
 816                printk(KERN_ERR "tlclk: platform_device_register failed.\n");
 817                ret = PTR_ERR(tlclk_device);
 818                goto out4;
 819        }
 820
 821        ret = sysfs_create_group(&tlclk_device->dev.kobj,
 822                        &tlclk_attribute_group);
 823        if (ret) {
 824                printk(KERN_ERR "tlclk: failed to create sysfs device attributes.\n");
 825                goto out5;
 826        }
 827
 828        return 0;
 829out5:
 830        platform_device_unregister(tlclk_device);
 831out4:
 832        misc_deregister(&tlclk_miscdev);
 833out3:
 834        release_region(TLCLK_BASE, 8);
 835out2:
 836        kfree(alarm_events);
 837out1:
 838        unregister_chrdev(tlclk_major, "telco_clock");
 839        return ret;
 840}
 841
 842static void __exit tlclk_cleanup(void)
 843{
 844        sysfs_remove_group(&tlclk_device->dev.kobj, &tlclk_attribute_group);
 845        platform_device_unregister(tlclk_device);
 846        misc_deregister(&tlclk_miscdev);
 847        unregister_chrdev(tlclk_major, "telco_clock");
 848
 849        release_region(TLCLK_BASE, 8);
 850        del_timer_sync(&switchover_timer);
 851        kfree(alarm_events);
 852
 853}
 854
 855static void switchover_timeout(unsigned long data)
 856{
 857        unsigned long flags = *(unsigned long *) data;
 858
 859        if ((flags & 1)) {
 860                if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 861                        alarm_events->switchover_primary++;
 862        } else {
 863                if ((inb(TLCLK_REG1) & 0x08) != (flags & 0x08))
 864                        alarm_events->switchover_secondary++;
 865        }
 866
 867        /* Alarm processing is done, wake up read task */
 868        del_timer(&switchover_timer);
 869        got_event = 1;
 870        wake_up(&wq);
 871}
 872
 873static irqreturn_t tlclk_interrupt(int irq, void *dev_id)
 874{
 875        unsigned long flags;
 876
 877        spin_lock_irqsave(&event_lock, flags);
 878        /* Read and clear interrupt events */
 879        int_events = inb(TLCLK_REG6);
 880
 881        /* Primary_Los changed from 0 to 1 ? */
 882        if (int_events & PRI_LOS_01_MASK) {
 883                if (inb(TLCLK_REG2) & SEC_LOST_MASK)
 884                        alarm_events->lost_clocks++;
 885                else
 886                        alarm_events->lost_primary_clock++;
 887        }
 888
 889        /* Primary_Los changed from 1 to 0 ? */
 890        if (int_events & PRI_LOS_10_MASK) {
 891                alarm_events->primary_clock_back++;
 892                SET_PORT_BITS(TLCLK_REG1, 0xFE, 1);
 893        }
 894        /* Secondary_Los changed from 0 to 1 ? */
 895        if (int_events & SEC_LOS_01_MASK) {
 896                if (inb(TLCLK_REG2) & PRI_LOST_MASK)
 897                        alarm_events->lost_clocks++;
 898                else
 899                        alarm_events->lost_secondary_clock++;
 900        }
 901        /* Secondary_Los changed from 1 to 0 ? */
 902        if (int_events & SEC_LOS_10_MASK) {
 903                alarm_events->secondary_clock_back++;
 904                SET_PORT_BITS(TLCLK_REG1, 0xFE, 0);
 905        }
 906        if (int_events & HOLDOVER_10_MASK)
 907                alarm_events->pll_end_holdover++;
 908
 909        if (int_events & UNLOCK_01_MASK)
 910                alarm_events->pll_lost_sync++;
 911
 912        if (int_events & UNLOCK_10_MASK)
 913                alarm_events->pll_sync++;
 914
 915        /* Holdover changed from 0 to 1 ? */
 916        if (int_events & HOLDOVER_01_MASK) {
 917                alarm_events->pll_holdover++;
 918
 919                /* TIMEOUT in ~10ms */
 920                switchover_timer.expires = jiffies + msecs_to_jiffies(10);
 921                tlclk_timer_data = inb(TLCLK_REG1);
 922                switchover_timer.data = (unsigned long) &tlclk_timer_data;
 923                mod_timer(&switchover_timer, switchover_timer.expires);
 924        } else {
 925                got_event = 1;
 926                wake_up(&wq);
 927        }
 928        spin_unlock_irqrestore(&event_lock, flags);
 929
 930        return IRQ_HANDLED;
 931}
 932
 933module_init(tlclk_init);
 934module_exit(tlclk_cleanup);
 935