drivers/staging/meilhaus/me4600_ext_irq.c

   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 #include <linux/version.h>
  43
  44 #include "medefines.h"
  45 #include "meinternal.h"
  46 #include "meerror.h"
  47
  48 #include "medebug.h"
  49 #include "meids.h"
  50 #include "me4600_reg.h"
  51 #include "me4600_ai_reg.h"
  52 #include "me4600_ext_irq_reg.h"
  53 #include "me4600_ext_irq.h"
  54
  55 /*
  56  * Defines
  57  */
  58
  59 /*
  60  * Functions
  61  */
  62
  63 static int me4600_ext_irq_io_irq_start(me_subdevice_t *subdevice,
  64                                        struct file *filep,
  65                                        int channel,
  66                                        int irq_source,
  67                                        int irq_edge, int irq_arg, int flags)
  68 {
  69         me4600_ext_irq_subdevice_t *instance;
  70         int err = ME_ERRNO_SUCCESS;
  71         unsigned long cpu_flags;
  72         uint32_t tmp;
  73
  74         PDEBUG("executed.\n");
  75
  76         instance = (me4600_ext_irq_subdevice_t *) subdevice;
  77
  78         if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
  79                 PERROR("Invalid flag specified.\n");
  80                 return ME_ERRNO_INVALID_FLAGS;
  81         }
  82
  83         if ((irq_edge != ME_IRQ_EDGE_RISING)
  84             && (irq_edge != ME_IRQ_EDGE_FALLING)
  85             && (irq_edge != ME_IRQ_EDGE_ANY)
  86             ) {
  87                 PERROR("Invalid irq edge specified.\n");
  88                 return ME_ERRNO_INVALID_IRQ_EDGE;
  89         }
  90
  91         if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
  92                 PERROR("Invalid irq source specified.\n");
  93                 return ME_ERRNO_INVALID_IRQ_SOURCE;
  94         }
  95
  96         if (channel) {
  97                 PERROR("Invalid channel specified.\n");
  98                 return ME_ERRNO_INVALID_CHANNEL;
  99         }
 100
 101         ME_SUBDEVICE_ENTER;
 102
 103         spin_lock(&instance->subdevice_lock);
 104         tmp = 0x0;              //inl(instance->ext_irq_config_reg);
 105
 106         if (irq_edge == ME_IRQ_EDGE_RISING) {
 107                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 108                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_RISING;
 109         } else if (irq_edge == ME_IRQ_EDGE_FALLING) {
 110                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 111                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
 112                 tmp = ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
 113         } else if (irq_edge == ME_IRQ_EDGE_ANY) {
 114                 //tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
 115                 //tmp |= ME4600_EXT_IRQ_CONFIG_MASK_ANY;
 116                 tmp = ME4600_EXT_IRQ_CONFIG_MASK_ANY;
 117         }
 118
 119         outl(tmp, instance->ext_irq_config_reg);
 120         PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
 121                    instance->reg_base,
 122                    instance->ext_irq_config_reg - instance->reg_base, tmp);
 123
 124         spin_lock_irqsave(instance->ctrl_reg_lock, cpu_flags);
 125         tmp = inl(instance->ctrl_reg);
 126         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 127         tmp |= ME4600_AI_CTRL_BIT_EX_IRQ;
 128         outl(tmp, instance->ctrl_reg);
 129         spin_unlock_irqrestore(instance->ctrl_reg_lock, cpu_flags);
 130         instance->rised = 0;
 131         spin_unlock(&instance->subdevice_lock);
 132
 133         ME_SUBDEVICE_EXIT;
 134
 135         return err;
 136 }
 137
 138 static int me4600_ext_irq_io_irq_wait(me_subdevice_t *subdevice,
 139                                       struct file *filep,
 140                                       int channel,
 141                                       int *irq_count,
 142                                       int *value, int time_out, int flags)
 143 {
 144         me4600_ext_irq_subdevice_t *instance;
 145         int err = ME_ERRNO_SUCCESS;
 146         long t = 0;
 147         unsigned long cpu_flags;
 148
 149         PDEBUG("executed.\n");
 150
 151         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 152
 153         if (flags) {
 154                 PERROR("Invalid flag specified.\n");
 155                 return ME_ERRNO_INVALID_FLAGS;
 156         }
 157
 158         if (channel) {
 159                 PERROR("Invalid channel specified.\n");
 160                 return ME_ERRNO_INVALID_CHANNEL;
 161         }
 162
 163         if (time_out < 0) {
 164                 PERROR("Invalid time_out specified.\n");
 165                 return ME_ERRNO_INVALID_TIMEOUT;
 166         }
 167
 168         if (time_out) {
 169                 t = (time_out * HZ) / 1000;
 170
 171                 if (t == 0)
 172                         t = 1;
 173         }
 174
 175         ME_SUBDEVICE_ENTER;
 176
 177         if (instance->rised <= 0) {
 178                 instance->rised = 0;
 179                 if (time_out) {
 180                         t = wait_event_interruptible_timeout(instance->
 181                                                              wait_queue,
 182                                                              (instance->rised !=
 183                                                               0), t);
 184
 185                         if (t == 0) {
 186                                 PERROR
 187                                     ("Wait on external interrupt timed out.\n");
 188                                 err = ME_ERRNO_TIMEOUT;
 189                         }
 190                 } else {
 191                         wait_event_interruptible(instance->wait_queue,
 192                                                  (instance->rised != 0));
 193                 }
 194
 195                 if (instance->rised < 0) {
 196                         PERROR("Wait on interrupt aborted by user.\n");
 197                         err = ME_ERRNO_CANCELLED;
 198                 }
 199         }
 200
 201         if (signal_pending(current)) {
 202                 PERROR("Wait on external interrupt aborted by signal.\n");
 203                 err = ME_ERRNO_SIGNAL;
 204         }
 205
 206         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 207         instance->rised = 0;
 208         *irq_count = instance->count;
 209         *value = instance->value;
 210         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 211
 212         ME_SUBDEVICE_EXIT;
 213
 214         return err;
 215 }
 216
 217 static int me4600_ext_irq_io_irq_stop(me_subdevice_t *subdevice,
 218                                       struct file *filep,
 219                                       int channel, int flags)
 220 {
 221         me4600_ext_irq_subdevice_t *instance;
 222         int err = ME_ERRNO_SUCCESS;
 223         unsigned long cpu_flags;
 224         uint32_t tmp;
 225
 226         PDEBUG("executed.\n");
 227
 228         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 229
 230         if (flags) {
 231                 PERROR("Invalid flag specified.\n");
 232                 return ME_ERRNO_INVALID_FLAGS;
 233         }
 234
 235         if (channel) {
 236                 PERROR("Invalid channel specified.\n");
 237                 return ME_ERRNO_INVALID_CHANNEL;
 238         }
 239
 240         ME_SUBDEVICE_ENTER;
 241
 242         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 243         spin_lock(instance->ctrl_reg_lock);
 244         tmp = inl(instance->ctrl_reg);
 245         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 246         outl(tmp, instance->ctrl_reg);
 247         PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 248                    instance->ctrl_reg - instance->reg_base, tmp);
 249         spin_unlock(instance->ctrl_reg_lock);
 250         instance->rised = -1;
 251         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 252         wake_up_interruptible_all(&instance->wait_queue);
 253
 254         ME_SUBDEVICE_EXIT;
 255
 256         return err;
 257 }
 258
 259 static int me4600_ext_irq_io_reset_subdevice(me_subdevice_t *subdevice,
 260                                              struct file *filep, int flags)
 261 {
 262         me4600_ext_irq_subdevice_t *instance;
 263         unsigned long cpu_flags;
 264         uint32_t tmp;
 265
 266         PDEBUG("executed.\n");
 267
 268         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 269
 270         if (flags) {
 271                 PERROR("Invalid flag specified.\n");
 272                 return ME_ERRNO_INVALID_FLAGS;
 273         }
 274
 275         ME_SUBDEVICE_ENTER;
 276
 277         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 278         spin_lock(instance->ctrl_reg_lock);
 279         tmp = inl(instance->ctrl_reg);
 280         tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
 281         outl(tmp, instance->ctrl_reg);
 282         PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 283                    instance->ctrl_reg - instance->reg_base, tmp);
 284         spin_unlock(instance->ctrl_reg_lock);
 285         instance->rised = -1;
 286         instance->count = 0;
 287         outl(ME4600_EXT_IRQ_CONFIG_MASK_ANY, instance->ext_irq_config_reg);
 288         PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
 289                    instance->reg_base,
 290                    instance->ext_irq_config_reg - instance->reg_base,
 291                    ME4600_EXT_IRQ_CONFIG_MASK_ANY);
 292         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 293         wake_up_interruptible_all(&instance->wait_queue);
 294
 295         ME_SUBDEVICE_EXIT;
 296
 297         return ME_ERRNO_SUCCESS;
 298 }
 299
 300 static void me4600_ext_irq_destructor(struct me_subdevice *subdevice)
 301 {
 302         me4600_ext_irq_subdevice_t *instance;
 303
 304         PDEBUG("executed.\n");
 305         instance = (me4600_ext_irq_subdevice_t *) subdevice;
 306         me_subdevice_deinit(&instance->base);
 307         free_irq(instance->irq, instance);
 308         kfree(instance);
 309 }
 310
 311 static int me4600_ext_irq_query_number_channels(me_subdevice_t *subdevice,
 312                                                 int *number)
 313 {
 314         PDEBUG("executed.\n");
 315         *number = 1;
 316         return ME_ERRNO_SUCCESS;
 317 }
 318
 319 static int me4600_ext_irq_query_subdevice_type(me_subdevice_t *subdevice,
 320                                                int *type, int *subtype)
 321 {
 322         PDEBUG("executed.\n");
 323         *type = ME_TYPE_EXT_IRQ;
 324         *subtype = ME_SUBTYPE_SINGLE;
 325         return ME_ERRNO_SUCCESS;
 326 }
 327
 328 static int me4600_ext_irq_query_subdevice_caps(me_subdevice_t *subdevice,
 329                                                int *caps)
 330 {
 331         PDEBUG("executed.\n");
 332         *caps =
 333             ME_CAPS_EXT_IRQ_EDGE_RISING | ME_CAPS_EXT_IRQ_EDGE_FALLING |
 334             ME_CAPS_EXT_IRQ_EDGE_ANY;
 335         return ME_ERRNO_SUCCESS;
 336 }
 337
 338 static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id)
 339 {
 340         me4600_ext_irq_subdevice_t *instance;
 341         uint32_t ctrl;
 342         uint32_t irq_status;
 343
 344         instance = (me4600_ext_irq_subdevice_t *) dev_id;
 345
 346         if (irq != instance->irq) {
 347                 PERROR("Incorrect interrupt num: %d.\n", irq);
 348                 return IRQ_NONE;
 349         }
 350
 351         irq_status = inl(instance->irq_status_reg);
 352         if (!(irq_status & ME4600_IRQ_STATUS_BIT_EX)) {
 353                 PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n",
 354                       jiffies, __func__, irq_status);
 355                 return IRQ_NONE;
 356         }
 357
 358         PDEBUG("executed.\n");
 359
 360         spin_lock(&instance->subdevice_lock);
 361         instance->rised = 1;
 362         instance->value = inl(instance->ext_irq_value_reg);
 363         instance->count++;
 364
 365         spin_lock(instance->ctrl_reg_lock);
 366         ctrl = inl(instance->ctrl_reg);
 367         ctrl |= ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
 368         outl(ctrl, instance->ctrl_reg);
 369         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 370                    instance->ctrl_reg - instance->reg_base, ctrl);
 371         ctrl &= ~ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
 372         outl(ctrl, instance->ctrl_reg);
 373         PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
 374                    instance->ctrl_reg - instance->reg_base, ctrl);
 375         spin_unlock(instance->ctrl_reg_lock);
 376
 377         spin_unlock(&instance->subdevice_lock);
 378         wake_up_interruptible_all(&instance->wait_queue);
 379
 380         return IRQ_HANDLED;
 381 }
 382
 383 me4600_ext_irq_subdevice_t *me4600_ext_irq_constructor(uint32_t reg_base,
 384                                                        int irq,
 385                                                        spinlock_t *
 386                                                        ctrl_reg_lock)
 387 {
 388         me4600_ext_irq_subdevice_t *subdevice;
 389         int err;
 390
 391         PDEBUG("executed.\n");
 392
 393         /* Allocate memory for subdevice instance */
 394         subdevice = kmalloc(sizeof(me4600_ext_irq_subdevice_t), GFP_KERNEL);
 395
 396         if (!subdevice) {
 397                 PERROR("Cannot get memory for subdevice instance.\n");
 398                 return NULL;
 399         }
 400
 401         memset(subdevice, 0, sizeof(me4600_ext_irq_subdevice_t));
 402
 403         /* Initialize subdevice base class */
 404         err = me_subdevice_init(&subdevice->base);
 405
 406         if (err) {
 407                 PERROR("Cannot initialize subdevice base class instance.\n");
 408                 kfree(subdevice);
 409                 return NULL;
 410         }
 411         // Initialize spin locks.
 412         spin_lock_init(&subdevice->subdevice_lock);
 413
 414         subdevice->ctrl_reg_lock = ctrl_reg_lock;
 415
 416         /* Initialize wait queue */
 417         init_waitqueue_head(&subdevice->wait_queue);
 418
 419         /* Register interrupt */
 420         subdevice->irq = irq;
 421
 422         if (request_irq(subdevice->irq, me4600_ext_irq_isr,
 423                         IRQF_DISABLED | IRQF_SHARED,
 424                         ME4600_NAME, subdevice)) {
 425                 PERROR("Cannot register interrupt.\n");
 426                 kfree(subdevice);
 427                 return NULL;
 428         }
 429         PINFO("Registered irq=%d.\n", subdevice->irq);
 430
 431         /* Initialize registers */
 432         subdevice->irq_status_reg = reg_base + ME4600_IRQ_STATUS_REG;
 433         subdevice->ctrl_reg = reg_base + ME4600_AI_CTRL_REG;
 434         subdevice->ext_irq_config_reg = reg_base + ME4600_EXT_IRQ_CONFIG_REG;
 435         subdevice->ext_irq_value_reg = reg_base + ME4600_EXT_IRQ_VALUE_REG;
 436 #ifdef MEDEBUG_DEBUG_REG
 437         subdevice->reg_base = reg_base;
 438 #endif
 439
 440         /* Override base class methods. */
 441         subdevice->base.me_subdevice_destructor = me4600_ext_irq_destructor;
 442         subdevice->base.me_subdevice_io_reset_subdevice =
 443             me4600_ext_irq_io_reset_subdevice;
 444         subdevice->base.me_subdevice_io_irq_start = me4600_ext_irq_io_irq_start;
 445         subdevice->base.me_subdevice_io_irq_wait = me4600_ext_irq_io_irq_wait;
 446         subdevice->base.me_subdevice_io_irq_stop = me4600_ext_irq_io_irq_stop;
 447         subdevice->base.me_subdevice_query_number_channels =
 448             me4600_ext_irq_query_number_channels;
 449         subdevice->base.me_subdevice_query_subdevice_type =
 450             me4600_ext_irq_query_subdevice_type;
 451         subdevice->base.me_subdevice_query_subdevice_caps =
 452             me4600_ext_irq_query_subdevice_caps;
 453
 454         subdevice->rised = 0;
 455         subdevice->count = 0;
 456
 457         return subdevice;
 458 }