drivers/staging/meilhaus/me0600_ext_irq.c

   1 /**
   2  * @file me0600_ext_irq.c
   3  *
   4  * @brief ME-630 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/version.h>
  36 #include <linux/module.h>
  37
  38 #include <linux/slab.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/io.h>
  41 #include <linux/types.h>
  42 #include <linux/interrupt.h>
  43
  44 #include "medefines.h"
  45 #include "meinternal.h"
  46 #include "meerror.h"
  47 #include "meids.h"
  48 #include "medebug.h"
  49
  50 #include "meplx_reg.h"
  51 #include "me0600_ext_irq_reg.h"
  52 #include "me0600_ext_irq.h"
  53
  54 /*
  55  * Functions
  56  */
  57
  58 static int me0600_ext_irq_io_irq_start(struct me_subdevice *subdevice,
  59                                        struct file *filep,
  60                                        int channel,
  61                                        int irq_source,
  62                                        int irq_edge, int irq_arg, int flags)
  63 {
  64         me0600_ext_irq_subdevice_t *instance;
  65         uint32_t tmp;
  66         unsigned long cpu_flags;
  67
  68         PDEBUG("executed.\n");
  69
  70         instance = (me0600_ext_irq_subdevice_t *) subdevice;
  71
  72         if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
  73                 PERROR("Invalid flag specified.\n");
  74                 return ME_ERRNO_INVALID_FLAGS;
  75         }
  76
  77         if (instance->lintno > 1) {
  78                 PERROR("Wrong idx=%d.\n", instance->lintno);
  79                 return ME_ERRNO_INVALID_SUBDEVICE;
  80         }
  81
  82         if (channel) {
  83                 PERROR("Invalid channel specified.\n");
  84                 return ME_ERRNO_INVALID_CHANNEL;
  85         }
  86
  87         if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
  88                 PERROR("Invalid irq source specified.\n");
  89                 return ME_ERRNO_INVALID_IRQ_SOURCE;
  90         }
  91
  92         if (irq_edge != ME_IRQ_EDGE_RISING) {
  93                 PERROR("Invalid irq edge specified.\n");
  94                 return ME_ERRNO_INVALID_IRQ_EDGE;
  95         }
  96
  97         ME_SUBDEVICE_ENTER;
  98
  99         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 100         spin_lock(instance->intcsr_lock);
 101         tmp = inl(instance->intcsr);
 102         switch (instance->lintno) {
 103         case 0:
 104                 tmp |=
 105                     PLX_INTCSR_LOCAL_INT1_EN | PLX_INTCSR_LOCAL_INT1_POL |
 106                     PLX_INTCSR_PCI_INT_EN;
 107                 break;
 108         case 1:
 109                 tmp |=
 110                     PLX_INTCSR_LOCAL_INT2_EN | PLX_INTCSR_LOCAL_INT2_POL |
 111                     PLX_INTCSR_PCI_INT_EN;
 112                 break;
 113         }
 114         outl(tmp, instance->intcsr);
 115         PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 116         spin_unlock(instance->intcsr_lock);
 117         instance->rised = 0;
 118         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 119
 120         ME_SUBDEVICE_EXIT;
 121
 122         return ME_ERRNO_SUCCESS;
 123 }
 124
 125 static int me0600_ext_irq_io_irq_wait(struct me_subdevice *subdevice,
 126                                       struct file *filep,
 127                                       int channel,
 128                                       int *irq_count,
 129                                       int *value, int time_out, int flags)
 130 {
 131         me0600_ext_irq_subdevice_t *instance;
 132         int err = ME_ERRNO_SUCCESS;
 133         long t = 0;
 134         unsigned long cpu_flags;
 135
 136         PDEBUG("executed.\n");
 137
 138         instance = (me0600_ext_irq_subdevice_t *) subdevice;
 139
 140         if (flags) {
 141                 PERROR("Invalid flag specified.\n");
 142                 return ME_ERRNO_INVALID_FLAGS;
 143         }
 144
 145         if (channel) {
 146                 PERROR("Invalid channel specified.\n");
 147                 return ME_ERRNO_INVALID_CHANNEL;
 148         }
 149
 150         if (time_out < 0) {
 151                 PERROR("Invalid time_out specified.\n");
 152                 return ME_ERRNO_INVALID_TIMEOUT;
 153         }
 154
 155         if (time_out) {
 156                 t = (time_out * HZ) / 1000;
 157
 158                 if (t == 0)
 159                         t = 1;
 160         }
 161
 162         ME_SUBDEVICE_ENTER;
 163
 164         if (instance->rised <= 0) {
 165                 instance->rised = 0;
 166
 167                 if (time_out) {
 168                         t = wait_event_interruptible_timeout(instance->
 169                                                              wait_queue,
 170                                                              (instance->rised !=
 171                                                               0), t);
 172
 173                         if (t == 0) {
 174                                 PERROR("Wait on interrupt timed out.\n");
 175                                 err = ME_ERRNO_TIMEOUT;
 176                         }
 177                 } else {
 178                         wait_event_interruptible(instance->wait_queue,
 179                                                  (instance->rised != 0));
 180                 }
 181
 182                 if (instance->rised < 0) {
 183                         PERROR("Wait on interrupt aborted by user.\n");
 184                         err = ME_ERRNO_CANCELLED;
 185                 }
 186         }
 187
 188         if (signal_pending(current)) {
 189                 PERROR("Wait on interrupt aborted by signal.\n");
 190                 err = ME_ERRNO_SIGNAL;
 191         }
 192
 193         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 194         instance->rised = 0;
 195         *irq_count = instance->n;
 196         *value = 1;
 197         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 198
 199         ME_SUBDEVICE_EXIT;
 200
 201         return err;
 202 }
 203
 204 static int me0600_ext_irq_io_irq_stop(struct me_subdevice *subdevice,
 205                                       struct file *filep,
 206                                       int channel, int flags)
 207 {
 208         me0600_ext_irq_subdevice_t *instance;
 209         int err = ME_ERRNO_SUCCESS;
 210         uint32_t tmp;
 211         unsigned long cpu_flags;
 212
 213         PDEBUG("executed.\n");
 214
 215         instance = (me0600_ext_irq_subdevice_t *) subdevice;
 216
 217         if (flags) {
 218                 PERROR("Invalid flag specified.\n");
 219                 return ME_ERRNO_INVALID_FLAGS;
 220         }
 221
 222         if (instance->lintno > 1) {
 223                 PERROR("Wrong idx=%d.\n", instance->lintno);
 224                 return ME_ERRNO_INVALID_SUBDEVICE;
 225         }
 226
 227         if (channel) {
 228                 PERROR("Invalid channel specified.\n");
 229                 return ME_ERRNO_INVALID_CHANNEL;
 230         }
 231
 232         ME_SUBDEVICE_ENTER;
 233
 234         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 235         spin_lock(instance->intcsr_lock);
 236         tmp = inl(instance->intcsr);
 237         switch (instance->lintno) {
 238         case 0:
 239                 tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
 240                 break;
 241         case 1:
 242                 tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
 243                 break;
 244         }
 245         outl(tmp, instance->intcsr);
 246         PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 247         spin_unlock(instance->intcsr_lock);
 248         instance->rised = -1;
 249         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 250         wake_up_interruptible_all(&instance->wait_queue);
 251
 252         ME_SUBDEVICE_EXIT;
 253
 254         return err;
 255 }
 256
 257 static int me0600_ext_irq_io_reset_subdevice(struct me_subdevice *subdevice,
 258                                              struct file *filep, int flags)
 259 {
 260         me0600_ext_irq_subdevice_t *instance;
 261         uint32_t tmp;
 262         unsigned long cpu_flags;
 263
 264         PDEBUG("executed.\n");
 265
 266         instance = (me0600_ext_irq_subdevice_t *) subdevice;
 267
 268         if (flags) {
 269                 PERROR("Invalid flag specified.\n");
 270                 return ME_ERRNO_INVALID_FLAGS;
 271         }
 272
 273         ME_SUBDEVICE_ENTER;
 274
 275         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 276         spin_lock(instance->intcsr_lock);
 277         tmp = inl(instance->intcsr);
 278         switch (instance->lintno) {
 279         case 0:
 280                 tmp |= PLX_INTCSR_LOCAL_INT1_POL | PLX_INTCSR_PCI_INT_EN;
 281                 tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
 282                 break;
 283         case 1:
 284                 tmp |= PLX_INTCSR_LOCAL_INT2_POL | PLX_INTCSR_PCI_INT_EN;
 285                 tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
 286                 break;
 287         }
 288         outl(tmp, instance->intcsr);
 289         PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 290         spin_unlock(instance->intcsr_lock);
 291
 292         instance->rised = -1;
 293         instance->n = 0;
 294         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 295         wake_up_interruptible_all(&instance->wait_queue);
 296
 297         ME_SUBDEVICE_EXIT;
 298
 299         return ME_ERRNO_SUCCESS;
 300 }
 301
 302 static int me0600_ext_irq_query_number_channels(struct me_subdevice *subdevice,
 303                                                 int *number)
 304 {
 305         PDEBUG("executed.\n");
 306         *number = 1;
 307         return ME_ERRNO_SUCCESS;
 308 }
 309
 310 static int me0600_ext_irq_query_subdevice_type(struct me_subdevice *subdevice,
 311                                                int *type, int *subtype)
 312 {
 313         PDEBUG("executed.\n");
 314         *type = ME_TYPE_EXT_IRQ;
 315         *subtype = ME_SUBTYPE_SINGLE;
 316         return ME_ERRNO_SUCCESS;
 317 }
 318
 319 static int me0600_ext_irq_query_subdevice_caps(struct me_subdevice *subdevice,
 320                                                int *caps)
 321 {
 322         PDEBUG("executed.\n");
 323         *caps = ME_CAPS_EXT_IRQ_EDGE_RISING;
 324         return ME_ERRNO_SUCCESS;
 325 }
 326
 327 static void me0600_ext_irq_destructor(struct me_subdevice *subdevice)
 328 {
 329         me0600_ext_irq_subdevice_t *instance;
 330
 331         PDEBUG("executed.\n");
 332
 333         instance = (me0600_ext_irq_subdevice_t *) subdevice;
 334
 335         free_irq(instance->irq, (void *)instance);
 336         me_subdevice_deinit(&instance->base);
 337         kfree(instance);
 338 }
 339
 340 static irqreturn_t me0600_isr(int irq, void *dev_id)
 341 {
 342         me0600_ext_irq_subdevice_t *instance;
 343         uint32_t status;
 344         uint32_t mask = PLX_INTCSR_PCI_INT_EN;
 345         irqreturn_t ret = IRQ_HANDLED;
 346
 347         instance = (me0600_ext_irq_subdevice_t *) dev_id;
 348
 349         if (irq != instance->irq) {
 350                 PERROR("Incorrect interrupt num: %d.\n", irq);
 351                 return IRQ_NONE;
 352         }
 353
 354         PDEBUG("executed.\n");
 355
 356         if (instance->lintno > 1) {
 357                 PERROR_CRITICAL
 358                     ("%s():Wrong subdevice index=%d plx:irq_status_reg=0x%04X.\n",
 359                      __func__, instance->lintno, inl(instance->intcsr));
 360                 return IRQ_NONE;
 361         }
 362
 363         spin_lock(&instance->subdevice_lock);
 364         spin_lock(instance->intcsr_lock);
 365         status = inl(instance->intcsr);
 366         switch (instance->lintno) {
 367         case 0:
 368                 mask |= PLX_INTCSR_LOCAL_INT1_STATE | PLX_INTCSR_LOCAL_INT1_EN;
 369                 break;
 370         case 1:
 371                 mask |= PLX_INTCSR_LOCAL_INT2_STATE | PLX_INTCSR_LOCAL_INT2_EN;
 372                 break;
 373         }
 374
 375         if ((status & mask) == mask) {
 376                 instance->rised = 1;
 377                 instance->n++;
 378                 inb(instance->reset_reg);
 379                 PDEBUG("Interrupt detected.\n");
 380         } else {
 381                 PINFO
 382                     ("%ld Shared interrupt. %s(): idx=0 plx:irq_status_reg=0x%04X\n",
 383                      jiffies, __func__, status);
 384                 ret = IRQ_NONE;
 385         }
 386         spin_unlock(instance->intcsr_lock);
 387         spin_unlock(&instance->subdevice_lock);
 388
 389         wake_up_interruptible_all(&instance->wait_queue);
 390
 391         return ret;
 392 }
 393
 394 me0600_ext_irq_subdevice_t *me0600_ext_irq_constructor(uint32_t plx_reg_base,
 395                                                        uint32_t me0600_reg_base,
 396                                                        spinlock_t *intcsr_lock,
 397                                                        unsigned ext_irq_idx,
 398                                                        int irq)
 399 {
 400         me0600_ext_irq_subdevice_t *subdevice;
 401         int err;
 402
 403         PDEBUG("executed.\n");
 404
 405         /* Allocate memory for subdevice instance */
 406         subdevice = kmalloc(sizeof(me0600_ext_irq_subdevice_t), GFP_KERNEL);
 407
 408         if (!subdevice) {
 409                 PERROR("Cannot get memory for 630_ext_irq instance.\n");
 410                 return NULL;
 411         }
 412
 413         memset(subdevice, 0, sizeof(me0600_ext_irq_subdevice_t));
 414
 415         /* Initialize subdevice base class */
 416         err = me_subdevice_init(&subdevice->base);
 417
 418         if (err) {
 419                 PERROR("Cannot initialize subdevice base class instance.\n");
 420                 kfree(subdevice);
 421                 return NULL;
 422         }
 423         // Initialize spin locks.
 424         spin_lock_init(&subdevice->subdevice_lock);
 425
 426         subdevice->intcsr_lock = intcsr_lock;
 427
 428         /* Initialize wait queue */
 429         init_waitqueue_head(&subdevice->wait_queue);
 430
 431         subdevice->lintno = ext_irq_idx;
 432
 433         /* Request interrupt line */
 434         subdevice->irq = irq;
 435
 436         err = request_irq(subdevice->irq, me0600_isr,
 437                           IRQF_DISABLED | IRQF_SHARED,
 438                           ME0600_NAME, (void *)subdevice);
 439
 440         if (err) {
 441                 PERROR("Cannot get interrupt line.\n");
 442                 kfree(subdevice);
 443                 return NULL;
 444         }
 445         PINFO("Registered irq=%d.\n", subdevice->irq);
 446
 447         /* Initialize registers */
 448         subdevice->intcsr = plx_reg_base + PLX_INTCSR;
 449         subdevice->reset_reg =
 450             me0600_reg_base + ME0600_INT_0_RESET_REG + ext_irq_idx;
 451
 452         /* Initialize the subdevice methods */
 453         subdevice->base.me_subdevice_io_irq_start = me0600_ext_irq_io_irq_start;
 454         subdevice->base.me_subdevice_io_irq_wait = me0600_ext_irq_io_irq_wait;
 455         subdevice->base.me_subdevice_io_irq_stop = me0600_ext_irq_io_irq_stop;
 456         subdevice->base.me_subdevice_io_reset_subdevice =
 457             me0600_ext_irq_io_reset_subdevice;
 458         subdevice->base.me_subdevice_query_number_channels =
 459             me0600_ext_irq_query_number_channels;
 460         subdevice->base.me_subdevice_query_subdevice_type =
 461             me0600_ext_irq_query_subdevice_type;
 462         subdevice->base.me_subdevice_query_subdevice_caps =
 463             me0600_ext_irq_query_subdevice_caps;
 464         subdevice->base.me_subdevice_destructor = me0600_ext_irq_destructor;
 465
 466         subdevice->rised = 0;
 467         subdevice->n = 0;
 468
 469         return subdevice;
 470 }