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   1 /**
   2  * @file me4600_ext_irq.c
   3  *
   4  * @brief ME-4000 external interrupt subdevice instance.
   5  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
   6  * @author Guenter Gebhardt
   7  * @author Krzysztof Gantzke    (k.gantzke@meilhaus.de)
   8  */
   9
  10 /*
  11  * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  12  *
  13  * This file is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef __KERNEL__
  29 #  define __KERNEL__
  30 #endif
  31
  32 /*
  33  * Includes
  34  */
  35 #include <linux/module.h>
  36
  37 #include <linux/slab.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/io.h>
  41 #include <linux/types.h>
  42
  43 #include "medefines.h"
  44 #include "meinternal.h"
  45 #include "meerror.h"
  46
  47 #include "medebug.h"
  48 #include "meids.h"
  49 #include "me4600_reg.h"
  50 #include "me4600_ai_reg.h"
  51 #include "me4600_ext_irq_reg.h"
  52 #include "me4600_ext_irq.h"
  53
  54 /*
  55  * Defines
  56  */
  57
  58 /*
  59  * Functions
  60  */
  61
  62 static int me4600_ext_irq_io_irq_start(me_subdevice_t *subdevice,
  63                                        struct file *filep,
  64                                        int channel,
  65                                        int irq_source,
  66                                        int irq_edge, int irq_arg, int flags)
  67 {
  68         me4600_ext_irq_subdevice_t *instance;
  69         int err = ME_ERRNO_SUCCESS;
  70         unsigned long cpu_flags;
  71         uint32_t tmp;
  72
  73         PDEBUG("executed.\n");
  74
  75         instance = (me4600_ext_irq_subdevice_t *) subdevice;
  76
  77         if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
  78                 PERROR("Invalid flag specified.\n");
  79                 return ME_ERRNO_INVALID_FLAGS;
  80         }
  81
  82         if ((irq_edge != ME_IRQ_EDGE_RISING)
  83             && (irq_edge != ME_IRQ_EDGE_FALLING)
  84             && (irq_edge != ME_IRQ_EDGE_ANY)
  85             ) {
  86                 PERROR("Invalid irq edge specified.\n");
  87                 return ME_ERRNO_INVALID_IRQ_EDGE;
  88         }
  89
  90         if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
  91                 PERROR("Invalid irq source specified.\n");
  92                 return ME_ERRNO_INVALID_IRQ_SOURCE;
  93         }
  94
  95         if (channel) {
  96                 PERROR("Invalid channel specified.\n");
  97                 return ME_ERRNO_INVALID_CHANNEL;
  98         }
  99
 100         ME_SUBDEVICE_ENTER;
 101
 102         spin_lock(&instance->subdevice_lock);
 103         tmp = 0x0;              //inl(instance->ext_irq_config_reg);
 104
 105         if (irq_edge == ME_IRQ_EDGE_RISING) {
 106                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 107                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_RISING;
 108         } else if (irq_edge == ME_IRQ_EDGE_FALLING) {
 109                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 110                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
 111                 tmp = ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
 112         } else if (irq_edge == ME_IRQ_EDGE_ANY) {
 113                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 114                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_ANY;
 115                 tmp = ME4600_EXT_IRQ_CONFIG_MASK_ANY;
 116         }
 117
 118         outl(tmp, instance->ext_irq_config_reg);
 119         PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
 120                    instance->reg_base,
 121                    instance->ext_irq_config_reg - instance->reg_base, tmp);
 122
 123         spin_lock_irqsave(instance->ctrl_reg_lock, cpu_flags);
 124         tmp = inl(instance->ctrl_reg);
 125         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 126         tmp |= ME4600_AI_CTRL_BIT_EX_IRQ;
 127         outl(tmp, instance->ctrl_reg);
 128         spin_unlock_irqrestore(instance->ctrl_reg_lock, cpu_flags);
 129         instance->rised = 0;
 130         spin_unlock(&instance->subdevice_lock);
 131
 132         ME_SUBDEVICE_EXIT;
 133
 134         return err;
 135 }
 136
 137 static int me4600_ext_irq_io_irq_wait(me_subdevice_t *subdevice,
 138                                       struct file *filep,
 139                                       int channel,
 140                                       int *irq_count,
 141                                       int *value, int time_out, int flags)
 142 {
 143         me4600_ext_irq_subdevice_t *instance;
 144         int err = ME_ERRNO_SUCCESS;
 145         long t = 0;
 146         unsigned long cpu_flags;
 147
 148         PDEBUG("executed.\n");
 149
 150         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 151
 152         if (flags) {
 153                 PERROR("Invalid flag specified.\n");
 154                 return ME_ERRNO_INVALID_FLAGS;
 155         }
 156
 157         if (channel) {
 158                 PERROR("Invalid channel specified.\n");
 159                 return ME_ERRNO_INVALID_CHANNEL;
 160         }
 161
 162         if (time_out < 0) {
 163                 PERROR("Invalid time_out specified.\n");
 164                 return ME_ERRNO_INVALID_TIMEOUT;
 165         }
 166
 167         if (time_out) {
 168                 t = (time_out * HZ) / 1000;
 169
 170                 if (t == 0)
 171                         t = 1;
 172         }
 173
 174         ME_SUBDEVICE_ENTER;
 175
 176         if (instance->rised <= 0) {
 177                 instance->rised = 0;
 178                 if (time_out) {
 179                         t = wait_event_interruptible_timeout(instance->
 180                                                              wait_queue,
 181                                                              (instance->rised !=
 182                                                               0), t);
 183
 184                         if (t == 0) {
 185                                 PERROR
 186                                     ("Wait on external interrupt timed out.\n");
 187                                 err = ME_ERRNO_TIMEOUT;
 188                         }
 189                 } else {
 190                         wait_event_interruptible(instance->wait_queue,
 191                                                  (instance->rised != 0));
 192                 }
 193
 194                 if (instance->rised < 0) {
 195                         PERROR("Wait on interrupt aborted by user.\n");
 196                         err = ME_ERRNO_CANCELLED;
 197                 }
 198         }
 199
 200         if (signal_pending(current)) {
 201                 PERROR("Wait on external interrupt aborted by signal.\n");
 202                 err = ME_ERRNO_SIGNAL;
 203         }
 204
 205         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 206         instance->rised = 0;
 207         *irq_count = instance->count;
 208         *value = instance->value;
 209         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 210
 211         ME_SUBDEVICE_EXIT;
 212
 213         return err;
 214 }
 215
 216 static int me4600_ext_irq_io_irq_stop(me_subdevice_t *subdevice,
 217                                       struct file *filep,
 218                                       int channel, int flags)
 219 {
 220         me4600_ext_irq_subdevice_t *instance;
 221         int err = ME_ERRNO_SUCCESS;
 222         unsigned long cpu_flags;
 223         uint32_t tmp;
 224
 225         PDEBUG("executed.\n");
 226
 227         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 228
 229         if (flags) {
 230                 PERROR("Invalid flag specified.\n");
 231                 return ME_ERRNO_INVALID_FLAGS;
 232         }
 233
 234         if (channel) {
 235                 PERROR("Invalid channel specified.\n");
 236                 return ME_ERRNO_INVALID_CHANNEL;
 237         }
 238
 239         ME_SUBDEVICE_ENTER;
 240
 241         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 242         spin_lock(instance->ctrl_reg_lock);
 243         tmp = inl(instance->ctrl_reg);
 244         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 245         outl(tmp, instance->ctrl_reg);
 246         PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 247                    instance->ctrl_reg - instance->reg_base, tmp);
 248         spin_unlock(instance->ctrl_reg_lock);
 249         instance->rised = -1;
 250         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 251         wake_up_interruptible_all(&instance->wait_queue);
 252
 253         ME_SUBDEVICE_EXIT;
 254
 255         return err;
 256 }
 257
 258 static int me4600_ext_irq_io_reset_subdevice(me_subdevice_t *subdevice,
 259                                              struct file *filep, int flags)
 260 {
 261         me4600_ext_irq_subdevice_t *instance;
 262         unsigned long cpu_flags;
 263         uint32_t tmp;
 264
 265         PDEBUG("executed.\n");
 266
 267         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 268
 269         if (flags) {
 270                 PERROR("Invalid flag specified.\n");
 271                 return ME_ERRNO_INVALID_FLAGS;
 272         }
 273
 274         ME_SUBDEVICE_ENTER;
 275
 276         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 277         spin_lock(instance->ctrl_reg_lock);
 278         tmp = inl(instance->ctrl_reg);
 279         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 280         outl(tmp, instance->ctrl_reg);
 281         PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 282                    instance->ctrl_reg - instance->reg_base, tmp);
 283         spin_unlock(instance->ctrl_reg_lock);
 284         instance->rised = -1;
 285         instance->count = 0;
 286         outl(ME4600_EXT_IRQ_CONFIG_MASK_ANY, instance->ext_irq_config_reg);
 287         PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
 288                    instance->reg_base,
 289                    instance->ext_irq_config_reg - instance->reg_base,
 290                    ME4600_EXT_IRQ_CONFIG_MASK_ANY);
 291         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 292         wake_up_interruptible_all(&instance->wait_queue);
 293
 294         ME_SUBDEVICE_EXIT;
 295
 296         return ME_ERRNO_SUCCESS;
 297 }
 298
 299 static void me4600_ext_irq_destructor(struct me_subdevice *subdevice)
 300 {
 301         me4600_ext_irq_subdevice_t *instance;
 302
 303         PDEBUG("executed.\n");
 304         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 305         me_subdevice_deinit(&instance->base);
 306         free_irq(instance->irq, instance);
 307         kfree(instance);
 308 }
 309
 310 static int me4600_ext_irq_query_number_channels(me_subdevice_t *subdevice,
 311                                                 int *number)
 312 {
 313         PDEBUG("executed.\n");
 314         *number = 1;
 315         return ME_ERRNO_SUCCESS;
 316 }
 317
 318 static int me4600_ext_irq_query_subdevice_type(me_subdevice_t *subdevice,
 319                                                int *type, int *subtype)
 320 {
 321         PDEBUG("executed.\n");
 322         *type = ME_TYPE_EXT_IRQ;
 323         *subtype = ME_SUBTYPE_SINGLE;
 324         return ME_ERRNO_SUCCESS;
 325 }
 326
 327 static int me4600_ext_irq_query_subdevice_caps(me_subdevice_t *subdevice,
 328                                                int *caps)
 329 {
 330         PDEBUG("executed.\n");
 331         *caps =
 332             ME_CAPS_EXT_IRQ_EDGE_RISING | ME_CAPS_EXT_IRQ_EDGE_FALLING |
 333             ME_CAPS_EXT_IRQ_EDGE_ANY;
 334         return ME_ERRNO_SUCCESS;
 335 }
 336
 337 static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id)
 338 {
 339         me4600_ext_irq_subdevice_t *instance;
 340         uint32_t ctrl;
 341         uint32_t irq_status;
 342
 343         instance = (me4600_ext_irq_subdevice_t *) dev_id;
 344
 345         if (irq != instance->irq) {
 346                 PERROR("Incorrect interrupt num: %d.\n", irq);
 347                 return IRQ_NONE;
 348         }
 349
 350         irq_status = inl(instance->irq_status_reg);
 351         if (!(irq_status & ME4600_IRQ_STATUS_BIT_EX)) {
 352                 PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n",
 353                       jiffies, __func__, irq_status);
 354                 return IRQ_NONE;
 355         }
 356
 357         PDEBUG("executed.\n");
 358
 359         spin_lock(&instance->subdevice_lock);
 360         instance->rised = 1;
 361         instance->value = inl(instance->ext_irq_value_reg);
 362         instance->count++;
 363
 364         spin_lock(instance->ctrl_reg_lock);
 365         ctrl = inl(instance->ctrl_reg);
 366         ctrl |= ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
 367         outl(ctrl, instance->ctrl_reg);
 368         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 369                    instance->ctrl_reg - instance->reg_base, ctrl);
 370         ctrl &= ~ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
 371         outl(ctrl, instance->ctrl_reg);
 372         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 373                    instance->ctrl_reg - instance->reg_base, ctrl);
 374         spin_unlock(instance->ctrl_reg_lock);
 375
 376         spin_unlock(&instance->subdevice_lock);
 377         wake_up_interruptible_all(&instance->wait_queue);
 378
 379         return IRQ_HANDLED;
 380 }
 381
 382 me4600_ext_irq_subdevice_t *me4600_ext_irq_constructor(uint32_t reg_base,
 383                                                        int irq,
 384                                                        spinlock_t *
 385                                                        ctrl_reg_lock)
 386 {
 387         me4600_ext_irq_subdevice_t *subdevice;
 388         int err;
 389
 390         PDEBUG("executed.\n");
 391
 392         /* Allocate memory for subdevice instance */
 393         subdevice = kmalloc(sizeof(me4600_ext_irq_subdevice_t), GFP_KERNEL);
 394
 395         if (!subdevice) {
 396                 PERROR("Cannot get memory for subdevice instance.\n");
 397                 return NULL;
 398         }
 399
 400         memset(subdevice, 0, sizeof(me4600_ext_irq_subdevice_t));
 401
 402         /* Initialize subdevice base class */
 403         err = me_subdevice_init(&subdevice->base);
 404
 405         if (err) {
 406                 PERROR("Cannot initialize subdevice base class instance.\n");
 407                 kfree(subdevice);
 408                 return NULL;
 409         }
 410         // Initialize spin locks.
 411         spin_lock_init(&subdevice->subdevice_lock);
 412
 413         subdevice->ctrl_reg_lock = ctrl_reg_lock;
 414
 415         /* Initialize wait queue */
 416         init_waitqueue_head(&subdevice->wait_queue);
 417
 418         /* Register interrupt */
 419         subdevice->irq = irq;
 420
 421         if (request_irq(subdevice->irq, me4600_ext_irq_isr,
 422                         IRQF_DISABLED | IRQF_SHARED,
 423                         ME4600_NAME, subdevice)) {
 424                 PERROR("Cannot register interrupt.\n");
 425                 kfree(subdevice);
 426                 return NULL;
 427         }
 428         PINFO("Registered irq=%d.\n", subdevice->irq);
 429
 430         /* Initialize registers */
 431         subdevice->irq_status_reg = reg_base + ME4600_IRQ_STATUS_REG;
 432         subdevice->ctrl_reg = reg_base + ME4600_AI_CTRL_REG;
 433         subdevice->ext_irq_config_reg = reg_base + ME4600_EXT_IRQ_CONFIG_REG;
 434         subdevice->ext_irq_value_reg = reg_base + ME4600_EXT_IRQ_VALUE_REG;
 435 #ifdef MEDEBUG_DEBUG_REG
 436         subdevice->reg_base = reg_base;
 437 #endif
 438
 439         /* Override base class methods. */
 440         subdevice->base.me_subdevice_destructor = me4600_ext_irq_destructor;
 441         subdevice->base.me_subdevice_io_reset_subdevice =
 442             me4600_ext_irq_io_reset_subdevice;
 443         subdevice->base.me_subdevice_io_irq_start = me4600_ext_irq_io_irq_start;
 444         subdevice->base.me_subdevice_io_irq_wait = me4600_ext_irq_io_irq_wait;
 445         subdevice->base.me_subdevice_io_irq_stop = me4600_ext_irq_io_irq_stop;
 446         subdevice->base.me_subdevice_query_number_channels =
 447             me4600_ext_irq_query_number_channels;
 448         subdevice->base.me_subdevice_query_subdevice_type =
 449             me4600_ext_irq_query_subdevice_type;
 450         subdevice->base.me_subdevice_query_subdevice_caps =
 451             me4600_ext_irq_query_subdevice_caps;
 452
 453         subdevice->rised = 0;
 454         subdevice->count = 0;
 455
 456         return subdevice;
 457 }