drivers/staging/meilhaus/me1400_ext_irq.c

   1 /**
   2  * @file me1400_ext_irq.c
   3  *
   4  * @brief ME-1400 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 <asm/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 "medebug.h"
  48 #include "meids.h"
  49
  50 #include "me1400_ext_irq.h"
  51 #include "me1400_ext_irq_reg.h"
  52
  53 /*
  54  * Defines
  55  */
  56 #define ME1400_EXT_IRQ_MAGIC_NUMBER     0x1401  /**< The magic number of the class structure. */
  57 #define ME1400_EXT_IRQ_NUMBER_CHANNELS 1        /**< One channel per counter. */
  58
  59 /*
  60  * Functions
  61  */
  62
  63 static int me1400_ext_irq_io_irq_start(struct me_subdevice *subdevice,
  64                                        struct file *filep,
  65                                        int channel,
  66                                        int irq_source,
  67                                        int irq_edge, int irq_arg, int flags)
  68 {
  69         me1400_ext_irq_subdevice_t *instance;
  70         unsigned long cpu_flags;
  71         uint8_t tmp;
  72
  73         PDEBUG("executed.\n");
  74
  75         instance = (me1400_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 (channel) {
  83                 PERROR("Invalid channel.\n");
  84                 return ME_ERRNO_INVALID_CHANNEL;
  85         }
  86
  87         if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
  88                 PERROR("Invalid irq source.\n");
  89                 return ME_ERRNO_INVALID_IRQ_SOURCE;
  90         }
  91
  92         if (irq_edge != ME_IRQ_EDGE_RISING) {
  93                 PERROR("Invalid irq edge.\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
 101         spin_lock(instance->clk_src_reg_lock);
 102 //                      // Enable IRQ on PLX
 103 //                      tmp = inb(instance->plx_intcs_reg) | (PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | PLX_PCI_INT_EN);
 104 //                      outb(tmp, instance->plx_intcs_reg);
 105 //                      PDEBUG_REG("ctrl_reg outb(PLX:0x%lX)=0x%x\n", instance->plx_intcs_reg, tmp);
 106
 107         // Enable IRQ
 108         switch (instance->device_id) {
 109         case PCI_DEVICE_ID_MEILHAUS_ME140C:
 110         case PCI_DEVICE_ID_MEILHAUS_ME140D:
 111                 tmp = inb(instance->ctrl_reg);
 112                 tmp |= ME1400CD_EXT_IRQ_CLK_EN;
 113                 outb(tmp, instance->ctrl_reg);
 114                 PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 115                            instance->reg_base,
 116                            instance->ctrl_reg - instance->reg_base, tmp);
 117                 break;
 118
 119         default:
 120                 outb(ME1400AB_EXT_IRQ_IRQ_EN, instance->ctrl_reg);
 121                 PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 122                            instance->reg_base,
 123                            instance->ctrl_reg - instance->reg_base,
 124                            ME1400AB_EXT_IRQ_IRQ_EN);
 125                 break;
 126         }
 127         spin_unlock(instance->clk_src_reg_lock);
 128         instance->rised = 0;
 129         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 130
 131         ME_SUBDEVICE_EXIT;
 132
 133         return ME_ERRNO_SUCCESS;
 134 }
 135
 136 static int me1400_ext_irq_io_irq_wait(struct me_subdevice *subdevice,
 137                                       struct file *filep,
 138                                       int channel,
 139                                       int *irq_count,
 140                                       int *value, int time_out, int flags)
 141 {
 142         me1400_ext_irq_subdevice_t *instance;
 143         unsigned long cpu_flags;
 144         long t = 0;
 145         int err = ME_ERRNO_SUCCESS;
 146
 147         PDEBUG("executed.\n");
 148
 149         instance = (me1400_ext_irq_subdevice_t *) subdevice;
 150
 151         if (flags) {
 152                 PERROR("Invalid flag specified.\n");
 153                 return ME_ERRNO_INVALID_FLAGS;
 154         }
 155
 156         if (channel) {
 157                 PERROR("Invalid channel.\n");
 158                 return ME_ERRNO_INVALID_CHANNEL;
 159         }
 160
 161         if (time_out < 0) {
 162                 PERROR("Invalid time out.\n");
 163                 return ME_ERRNO_INVALID_TIMEOUT;
 164         }
 165
 166         if (time_out) {
 167                 /* Convert to ticks */
 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("Wait on interrupt timed out.\n");
 186                                 err = ME_ERRNO_TIMEOUT;
 187                         }
 188                 } else {
 189                         wait_event_interruptible(instance->wait_queue,
 190                                                  (instance->rised != 0));
 191                 }
 192
 193                 if (instance->rised < 0) {
 194                         PERROR("Wait on interrupt aborted by user.\n");
 195                         err = ME_ERRNO_CANCELLED;
 196                 }
 197         }
 198
 199         if (signal_pending(current)) {
 200                 PERROR("Wait on interrupt aborted by signal.\n");
 201                 err = ME_ERRNO_SIGNAL;
 202         }
 203
 204         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 205         instance->rised = 0;
 206         *irq_count = instance->n;
 207         *value = 1;
 208         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 209
 210         ME_SUBDEVICE_EXIT;
 211
 212         return err;
 213 }
 214
 215 static int me1400_ext_irq_io_irq_stop(struct me_subdevice *subdevice,
 216                                       struct file *filep,
 217                                       int channel, int flags)
 218 {
 219         me1400_ext_irq_subdevice_t *instance;
 220         unsigned long cpu_flags;
 221         uint8_t tmp;
 222         int err = ME_ERRNO_SUCCESS;
 223
 224         PDEBUG("executed.\n");
 225
 226         instance = (me1400_ext_irq_subdevice_t *) subdevice;
 227
 228         if (flags) {
 229                 PERROR("Invalid flag specified.\n");
 230                 return ME_ERRNO_INVALID_FLAGS;
 231         }
 232
 233         if (channel) {
 234                 PERROR("Invalid channel.\n");
 235                 return ME_ERRNO_INVALID_CHANNEL;
 236         }
 237
 238         ME_SUBDEVICE_ENTER;
 239
 240         spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 241         spin_lock(instance->clk_src_reg_lock);
 242 //                      // Disable IRQ on PLX
 243 //                      tmp = inb(instance->plx_intcs_reg) & ( ~(PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | PLX_PCI_INT_EN));
 244 //                      outb(tmp, instance->plx_intcs_reg);
 245 //                      PDEBUG_REG("ctrl_reg outb(PLX:0x%lX)=0x%x\n", instance->plx_intcs_reg, tmp);
 246
 247         switch (instance->device_id) {
 248         case PCI_DEVICE_ID_MEILHAUS_ME140C:
 249         case PCI_DEVICE_ID_MEILHAUS_ME140D:
 250                 tmp = inb(instance->ctrl_reg);
 251                 tmp &= ~ME1400CD_EXT_IRQ_CLK_EN;
 252                 outb(tmp, instance->ctrl_reg);
 253                 PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 254                            instance->reg_base,
 255                            instance->ctrl_reg - instance->reg_base, tmp);
 256
 257                 break;
 258
 259         default:
 260                 outb(0x00, instance->ctrl_reg);
 261                 PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n",
 262                            instance->reg_base,
 263                            instance->ctrl_reg - instance->reg_base, 0x00);
 264                 break;
 265         }
 266         spin_unlock(instance->clk_src_reg_lock);
 267         instance->rised = -1;
 268         spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 269         wake_up_interruptible_all(&instance->wait_queue);
 270
 271         ME_SUBDEVICE_EXIT;
 272
 273         return err;
 274 }
 275
 276 static int me1400_ext_irq_io_reset_subdevice(struct me_subdevice *subdevice,
 277                                              struct file *filep, int flags)
 278 {
 279         me1400_ext_irq_subdevice_t *instance =
 280             (me1400_ext_irq_subdevice_t *) subdevice;
 281
 282         PDEBUG("executed.\n");
 283
 284         if (flags) {
 285                 PERROR("Invalid flag specified.\n");
 286                 return ME_ERRNO_INVALID_FLAGS;
 287         }
 288
 289         instance->n = 0;
 290         return me1400_ext_irq_io_irq_stop(subdevice, filep, 0, flags);
 291 }
 292
 293 static int me1400_ext_irq_query_number_channels(struct me_subdevice *subdevice,
 294                                                 int *number)
 295 {
 296         PDEBUG("executed.\n");
 297         *number = ME1400_EXT_IRQ_NUMBER_CHANNELS;
 298         return ME_ERRNO_SUCCESS;
 299 }
 300
 301 static int me1400_ext_irq_query_subdevice_type(struct me_subdevice *subdevice,
 302                                                int *type, int *subtype)
 303 {
 304         PDEBUG("executed.\n");
 305         *type = ME_TYPE_EXT_IRQ;
 306         *subtype = ME_SUBTYPE_SINGLE;
 307         return ME_ERRNO_SUCCESS;
 308 }
 309
 310 static int me1400_ext_irq_query_subdevice_caps(struct me_subdevice *subdevice,
 311                                                int *caps)
 312 {
 313         PDEBUG("executed.\n");
 314         *caps = ME_CAPS_EXT_IRQ_EDGE_RISING;
 315         return ME_ERRNO_SUCCESS;
 316 }
 317
 318 static int me1400_ext_irq_query_subdevice_caps_args(struct me_subdevice
 319                                                     *subdevice, int cap,
 320                                                     int *args, int count)
 321 {
 322         PDEBUG("executed.\n");
 323         return ME_ERRNO_NOT_SUPPORTED;
 324 }
 325
 326 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
 327 static irqreturn_t me1400_ext_irq_isr(int irq, void *dev_id)
 328 #else
 329 static irqreturn_t me1400_ext_irq_isr(int irq, void *dev_id,
 330                                       struct pt_regs *regs)
 331 #endif
 332 {
 333         me1400_ext_irq_subdevice_t *instance;
 334         uint32_t status;
 335         uint8_t tmp;
 336
 337         instance = (me1400_ext_irq_subdevice_t *) dev_id;
 338
 339         if (irq != instance->irq) {
 340                 PERROR("Incorrect interrupt num: %d.\n", irq);
 341                 return IRQ_NONE;
 342         }
 343
 344         spin_lock(&instance->subdevice_lock);
 345         status = inl(instance->plx_intcs_reg);
 346 //              if (!((status & PLX_LOCAL_INT1_STATE) && (status & PLX_LOCAL_INT1_EN) && (status & PLX_PCI_INT_EN)))
 347         if ((status &
 348              (PLX_LOCAL_INT1_STATE | PLX_LOCAL_INT1_EN | PLX_PCI_INT_EN)) !=
 349             (PLX_LOCAL_INT1_STATE | PLX_LOCAL_INT1_EN | PLX_PCI_INT_EN)) {
 350                 spin_unlock(&instance->subdevice_lock);
 351                 PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n",
 352                       jiffies, __FUNCTION__, status);
 353                 return IRQ_NONE;
 354         }
 355
 356         inl(instance->ctrl_reg);
 357
 358         PDEBUG("executed.\n");
 359
 360         instance->n++;
 361         instance->rised = 1;
 362
 363         switch (instance->device_id) {
 364
 365         case PCI_DEVICE_ID_MEILHAUS_ME140C:
 366         case PCI_DEVICE_ID_MEILHAUS_ME140D:
 367                 spin_lock(instance->clk_src_reg_lock);
 368                 tmp = inb(instance->ctrl_reg);
 369                 tmp &= ~ME1400CD_EXT_IRQ_CLK_EN;
 370                 outb(tmp, instance->ctrl_reg);
 371                 PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n",
 372                            instance->reg_base,
 373                            instance->ctrl_reg - instance->reg_base, tmp);
 374                 tmp |= ME1400CD_EXT_IRQ_CLK_EN;
 375                 outb(tmp, instance->ctrl_reg);
 376                 PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n",
 377                            instance->reg_base,
 378                            instance->ctrl_reg - instance->reg_base, tmp);
 379                 spin_unlock(instance->clk_src_reg_lock);
 380
 381                 break;
 382
 383         default:
 384                 outb(0, instance->ctrl_reg);
 385                 PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n",
 386                            instance->reg_base,
 387                            instance->ctrl_reg - instance->reg_base, 0);
 388                 outb(ME1400AB_EXT_IRQ_IRQ_EN, instance->ctrl_reg);
 389                 PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n",
 390                            instance->reg_base,
 391                            instance->ctrl_reg - instance->reg_base,
 392                            ME1400AB_EXT_IRQ_IRQ_EN);
 393                 break;
 394         }
 395
 396         spin_unlock(&instance->subdevice_lock);
 397         wake_up_interruptible_all(&instance->wait_queue);
 398
 399         return IRQ_HANDLED;
 400 }
 401
 402 static void me1400_ext_irq_destructor(struct me_subdevice *subdevice)
 403 {
 404         me1400_ext_irq_subdevice_t *instance;
 405         uint8_t tmp;
 406
 407         PDEBUG("executed.\n");
 408
 409         instance = (me1400_ext_irq_subdevice_t *) subdevice;
 410
 411         // Disable IRQ on PLX
 412         tmp =
 413             inb(instance->
 414                 plx_intcs_reg) & (~(PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL |
 415                                     PLX_PCI_INT_EN));
 416         outb(tmp, instance->plx_intcs_reg);
 417         PDEBUG_REG("ctrl_reg outb(plx:0x%lX)=0x%x\n", instance->plx_intcs_reg,
 418                    tmp);
 419
 420         free_irq(instance->irq, (void *)instance);
 421         me_subdevice_deinit(&instance->base);
 422         kfree(instance);
 423 }
 424
 425 me1400_ext_irq_subdevice_t *me1400_ext_irq_constructor(uint32_t device_id,
 426                                                        uint32_t plx_reg_base,
 427                                                        uint32_t me1400_reg_base,
 428                                                        spinlock_t *
 429                                                        clk_src_reg_lock,
 430                                                        int irq)
 431 {
 432         me1400_ext_irq_subdevice_t *subdevice;
 433         int err;
 434         uint8_t tmp;
 435
 436         PDEBUG("executed.\n");
 437
 438         /* Allocate memory for subdevice instance */
 439         subdevice = kmalloc(sizeof(me1400_ext_irq_subdevice_t), GFP_KERNEL);
 440
 441         if (!subdevice) {
 442                 PERROR("Cannot get memory for 1400_ext_irq instance.\n");
 443                 return NULL;
 444         }
 445
 446         memset(subdevice, 0, sizeof(me1400_ext_irq_subdevice_t));
 447
 448         /* Initialize subdevice base class */
 449         err = me_subdevice_init(&subdevice->base);
 450
 451         if (err) {
 452                 PERROR("Cannot initialize subdevice base class instance.\n");
 453                 kfree(subdevice);
 454                 return NULL;
 455         }
 456         // Initialize spin locks.
 457         spin_lock_init(&subdevice->subdevice_lock);
 458         subdevice->clk_src_reg_lock = clk_src_reg_lock;
 459
 460         /* Initialize wait queue */
 461         init_waitqueue_head(&subdevice->wait_queue);
 462
 463         subdevice->irq = irq;
 464
 465         err = request_irq(irq, me1400_ext_irq_isr,
 466 #ifdef IRQF_DISABLED
 467                           IRQF_DISABLED | IRQF_SHARED,
 468 #else
 469                           SA_INTERRUPT | SA_SHIRQ,
 470 #endif
 471                           ME1400_NAME, (void *)subdevice);
 472
 473         if (err) {
 474                 PERROR("Can't get irq.\n");
 475                 me_subdevice_deinit(&subdevice->base);
 476                 kfree(subdevice);
 477                 return NULL;
 478         }
 479         PINFO("Registered irq=%d.\n", subdevice->irq);
 480
 481         /* Initialize registers */
 482         subdevice->plx_intcs_reg = plx_reg_base + PLX_INTCSR_REG;
 483         subdevice->ctrl_reg = me1400_reg_base + ME1400AB_EXT_IRQ_CTRL_REG;
 484 #ifdef MEDEBUG_DEBUG_REG
 485         subdevice->reg_base = me1400_reg_base;
 486 #endif
 487
 488         // Enable IRQ on PLX
 489         tmp =
 490             inb(subdevice->
 491                 plx_intcs_reg) | (PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL |
 492                                   PLX_PCI_INT_EN);
 493         outb(tmp, subdevice->plx_intcs_reg);
 494         PDEBUG_REG("ctrl_reg outb(Pplx:0x%lX)=0x%x\n", subdevice->plx_intcs_reg,
 495                    tmp);
 496
 497         /* Initialize the subdevice methods */
 498         subdevice->base.me_subdevice_io_irq_start = me1400_ext_irq_io_irq_start;
 499         subdevice->base.me_subdevice_io_irq_wait = me1400_ext_irq_io_irq_wait;
 500         subdevice->base.me_subdevice_io_irq_stop = me1400_ext_irq_io_irq_stop;
 501         subdevice->base.me_subdevice_io_reset_subdevice =
 502             me1400_ext_irq_io_reset_subdevice;
 503         subdevice->base.me_subdevice_query_number_channels =
 504             me1400_ext_irq_query_number_channels;
 505         subdevice->base.me_subdevice_query_subdevice_type =
 506             me1400_ext_irq_query_subdevice_type;
 507         subdevice->base.me_subdevice_query_subdevice_caps =
 508             me1400_ext_irq_query_subdevice_caps;
 509         subdevice->base.me_subdevice_query_subdevice_caps_args =
 510             me1400_ext_irq_query_subdevice_caps_args;
 511         subdevice->base.me_subdevice_destructor = me1400_ext_irq_destructor;
 512
 513         subdevice->rised = 0;
 514         subdevice->n = 0;
 515
 516         return subdevice;
 517 }