drivers/vme/bridges/vme_fake.c

   1 /*
   2  * Fake VME bridge support.
   3  *
   4  * This drive provides a fake VME bridge chip, this enables debugging of the
   5  * VME framework in the absence of a VME system.
   6  *
   7  * This driver has to do a number of things in software that would be driven
   8  * by hardware if it was available, it will also result in extra overhead at
   9  * times when compared with driving actual hardware.
  10  *
  11  * Author: Martyn Welch <martyn@welches.me.uk>
  12  * Copyright (c) 2014 Martyn Welch
  13  *
  14  * Based on vme_tsi148.c:
  15  *
  16  * Author: Martyn Welch <martyn.welch@ge.com>
  17  * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
  18  *
  19  * Based on work by Tom Armistead and Ajit Prem
  20  * Copyright 2004 Motorola Inc.
  21  *
  22  * This program is free software; you can redistribute  it and/or modify it
  23  * under  the terms of  the GNU General  Public License as published by the
  24  * Free Software Foundation;  either version 2 of the  License, or (at your
  25  * option) any later version.
  26  */
  27
  28 #include <linux/device.h>
  29 #include <linux/errno.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/module.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/slab.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/types.h>
  36 #include <linux/vme.h>
  37
  38 #include "../vme_bridge.h"
  39
  40 /*
  41  *  Define the number of each that the fake driver supports.
  42  */
  43 #define FAKE_MAX_MASTER         8       /* Max Master Windows */
  44 #define FAKE_MAX_SLAVE          8       /* Max Slave Windows */
  45
  46 /* Structures to hold information normally held in device registers */
  47 struct fake_slave_window {
  48         int enabled;
  49         unsigned long long vme_base;
  50         unsigned long long size;
  51         void *buf_base;
  52         u32 aspace;
  53         u32 cycle;
  54 };
  55
  56 struct fake_master_window {
  57         int enabled;
  58         unsigned long long vme_base;
  59         unsigned long long size;
  60         u32 aspace;
  61         u32 cycle;
  62         u32 dwidth;
  63 };
  64
  65 /* Structure used to hold driver specific information */
  66 struct fake_driver {
  67         struct vme_bridge *parent;
  68         struct fake_slave_window slaves[FAKE_MAX_SLAVE];
  69         struct fake_master_window masters[FAKE_MAX_MASTER];
  70         u32 lm_enabled;
  71         unsigned long long lm_base;
  72         u32 lm_aspace;
  73         u32 lm_cycle;
  74         void (*lm_callback[4])(void *);
  75         void *lm_data[4];
  76         struct tasklet_struct int_tasklet;
  77         int int_level;
  78         int int_statid;
  79         void *crcsr_kernel;
  80         dma_addr_t crcsr_bus;
  81         /* Only one VME interrupt can be generated at a time, provide locking */
  82         struct mutex vme_int;
  83 };
  84
  85 /* Module parameter */
  86 static int geoid;
  87
  88 static const char driver_name[] = "vme_fake";
  89
  90 static struct vme_bridge *exit_pointer;
  91
  92 static struct device *vme_root;
  93
  94 /*
  95  * Calling VME bus interrupt callback if provided.
  96  */
  97 static void fake_VIRQ_tasklet(unsigned long data)
  98 {
  99         struct vme_bridge *fake_bridge;
 100         struct fake_driver *bridge;
 101
 102         fake_bridge = (struct vme_bridge *) data;
 103         bridge = fake_bridge->driver_priv;
 104
 105         vme_irq_handler(fake_bridge, bridge->int_level, bridge->int_statid);
 106 }
 107
 108 /*
 109  * Configure VME interrupt
 110  */
 111 static void fake_irq_set(struct vme_bridge *fake_bridge, int level,
 112                 int state, int sync)
 113 {
 114         /* Nothing to do */
 115 }
 116
 117 static void *fake_pci_to_ptr(dma_addr_t addr)
 118 {
 119         return (void *)(uintptr_t)addr;
 120 }
 121
 122 static dma_addr_t fake_ptr_to_pci(void *addr)
 123 {
 124         return (dma_addr_t)(uintptr_t)addr;
 125 }
 126
 127 /*
 128  * Generate a VME bus interrupt at the requested level & vector. Wait for
 129  * interrupt to be acked.
 130  */
 131 static int fake_irq_generate(struct vme_bridge *fake_bridge, int level,
 132                 int statid)
 133 {
 134         struct fake_driver *bridge;
 135
 136         bridge = fake_bridge->driver_priv;
 137
 138         mutex_lock(&bridge->vme_int);
 139
 140         bridge->int_level = level;
 141
 142         bridge->int_statid = statid;
 143
 144         /*
 145          * Schedule tasklet to run VME handler to emulate normal VME interrupt
 146          * handler behaviour.
 147          */
 148         tasklet_schedule(&bridge->int_tasklet);
 149
 150         mutex_unlock(&bridge->vme_int);
 151
 152         return 0;
 153 }
 154
 155 /*
 156  * Initialize a slave window with the requested attributes.
 157  */
 158 static int fake_slave_set(struct vme_slave_resource *image, int enabled,
 159                 unsigned long long vme_base, unsigned long long size,
 160                 dma_addr_t buf_base, u32 aspace, u32 cycle)
 161 {
 162         unsigned int i, granularity = 0;
 163         unsigned long long vme_bound;
 164         struct vme_bridge *fake_bridge;
 165         struct fake_driver *bridge;
 166
 167         fake_bridge = image->parent;
 168         bridge = fake_bridge->driver_priv;
 169
 170         i = image->number;
 171
 172         switch (aspace) {
 173         case VME_A16:
 174                 granularity = 0x10;
 175                 break;
 176         case VME_A24:
 177                 granularity = 0x1000;
 178                 break;
 179         case VME_A32:
 180                 granularity = 0x10000;
 181                 break;
 182         case VME_A64:
 183                 granularity = 0x10000;
 184                 break;
 185         case VME_CRCSR:
 186         case VME_USER1:
 187         case VME_USER2:
 188         case VME_USER3:
 189         case VME_USER4:
 190         default:
 191                 pr_err("Invalid address space\n");
 192                 return -EINVAL;
 193         }
 194
 195         /*
 196          * Bound address is a valid address for the window, adjust
 197          * accordingly
 198          */
 199         vme_bound = vme_base + size - granularity;
 200
 201         if (vme_base & (granularity - 1)) {
 202                 pr_err("Invalid VME base alignment\n");
 203                 return -EINVAL;
 204         }
 205         if (vme_bound & (granularity - 1)) {
 206                 pr_err("Invalid VME bound alignment\n");
 207                 return -EINVAL;
 208         }
 209
 210         mutex_lock(&image->mtx);
 211
 212         bridge->slaves[i].enabled = enabled;
 213         bridge->slaves[i].vme_base = vme_base;
 214         bridge->slaves[i].size = size;
 215         bridge->slaves[i].buf_base = fake_pci_to_ptr(buf_base);
 216         bridge->slaves[i].aspace = aspace;
 217         bridge->slaves[i].cycle = cycle;
 218
 219         mutex_unlock(&image->mtx);
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Get slave window configuration.
 226  */
 227 static int fake_slave_get(struct vme_slave_resource *image, int *enabled,
 228                 unsigned long long *vme_base, unsigned long long *size,
 229                 dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
 230 {
 231         unsigned int i;
 232         struct fake_driver *bridge;
 233
 234         bridge = image->parent->driver_priv;
 235
 236         i = image->number;
 237
 238         mutex_lock(&image->mtx);
 239
 240         *enabled = bridge->slaves[i].enabled;
 241         *vme_base = bridge->slaves[i].vme_base;
 242         *size = bridge->slaves[i].size;
 243         *buf_base = fake_ptr_to_pci(bridge->slaves[i].buf_base);
 244         *aspace = bridge->slaves[i].aspace;
 245         *cycle = bridge->slaves[i].cycle;
 246
 247         mutex_unlock(&image->mtx);
 248
 249         return 0;
 250 }
 251
 252 /*
 253  * Set the attributes of an outbound window.
 254  */
 255 static int fake_master_set(struct vme_master_resource *image, int enabled,
 256                 unsigned long long vme_base, unsigned long long size,
 257                 u32 aspace, u32 cycle, u32 dwidth)
 258 {
 259         int retval = 0;
 260         unsigned int i;
 261         struct vme_bridge *fake_bridge;
 262         struct fake_driver *bridge;
 263
 264         fake_bridge = image->parent;
 265
 266         bridge = fake_bridge->driver_priv;
 267
 268         /* Verify input data */
 269         if (vme_base & 0xFFFF) {
 270                 pr_err("Invalid VME Window alignment\n");
 271                 retval = -EINVAL;
 272                 goto err_window;
 273         }
 274
 275         if (size & 0xFFFF) {
 276                 pr_err("Invalid size alignment\n");
 277                 retval = -EINVAL;
 278                 goto err_window;
 279         }
 280
 281         if ((size == 0) && (enabled != 0)) {
 282                 pr_err("Size must be non-zero for enabled windows\n");
 283                 retval = -EINVAL;
 284                 goto err_window;
 285         }
 286
 287         /* Setup data width */
 288         switch (dwidth) {
 289         case VME_D8:
 290         case VME_D16:
 291         case VME_D32:
 292                 break;
 293         default:
 294                 pr_err("Invalid data width\n");
 295                 retval = -EINVAL;
 296                 goto err_dwidth;
 297         }
 298
 299         /* Setup address space */
 300         switch (aspace) {
 301         case VME_A16:
 302         case VME_A24:
 303         case VME_A32:
 304         case VME_A64:
 305         case VME_CRCSR:
 306         case VME_USER1:
 307         case VME_USER2:
 308         case VME_USER3:
 309         case VME_USER4:
 310                 break;
 311         default:
 312                 pr_err("Invalid address space\n");
 313                 retval = -EINVAL;
 314                 goto err_aspace;
 315         }
 316
 317         spin_lock(&image->lock);
 318
 319         i = image->number;
 320
 321         bridge->masters[i].enabled = enabled;
 322         bridge->masters[i].vme_base = vme_base;
 323         bridge->masters[i].size = size;
 324         bridge->masters[i].aspace = aspace;
 325         bridge->masters[i].cycle = cycle;
 326         bridge->masters[i].dwidth = dwidth;
 327
 328         spin_unlock(&image->lock);
 329
 330         return 0;
 331
 332 err_aspace:
 333 err_dwidth:
 334 err_window:
 335         return retval;
 336
 337 }
 338
 339 /*
 340  * Set the attributes of an outbound window.
 341  */
 342 static int __fake_master_get(struct vme_master_resource *image, int *enabled,
 343                 unsigned long long *vme_base, unsigned long long *size,
 344                 u32 *aspace, u32 *cycle, u32 *dwidth)
 345 {
 346         unsigned int i;
 347         struct fake_driver *bridge;
 348
 349         bridge = image->parent->driver_priv;
 350
 351         i = image->number;
 352
 353         *enabled = bridge->masters[i].enabled;
 354         *vme_base = bridge->masters[i].vme_base;
 355         *size = bridge->masters[i].size;
 356         *aspace = bridge->masters[i].aspace;
 357         *cycle = bridge->masters[i].cycle;
 358         *dwidth = bridge->masters[i].dwidth;
 359
 360         return 0;
 361 }
 362
 363
 364 static int fake_master_get(struct vme_master_resource *image, int *enabled,
 365                 unsigned long long *vme_base, unsigned long long *size,
 366                 u32 *aspace, u32 *cycle, u32 *dwidth)
 367 {
 368         int retval;
 369
 370         spin_lock(&image->lock);
 371
 372         retval = __fake_master_get(image, enabled, vme_base, size, aspace,
 373                         cycle, dwidth);
 374
 375         spin_unlock(&image->lock);
 376
 377         return retval;
 378 }
 379
 380
 381 static void fake_lm_check(struct fake_driver *bridge, unsigned long long addr,
 382                           u32 aspace, u32 cycle)
 383 {
 384         struct vme_bridge *fake_bridge;
 385         unsigned long long lm_base;
 386         u32 lm_aspace, lm_cycle;
 387         int i;
 388         struct vme_lm_resource *lm;
 389         struct list_head *pos = NULL, *n;
 390
 391         /* Get vme_bridge */
 392         fake_bridge = bridge->parent;
 393
 394         /* Loop through each location monitor resource */
 395         list_for_each_safe(pos, n, &fake_bridge->lm_resources) {
 396                 lm = list_entry(pos, struct vme_lm_resource, list);
 397
 398                 /* If disabled, we're done */
 399                 if (bridge->lm_enabled == 0)
 400                         return;
 401
 402                 lm_base = bridge->lm_base;
 403                 lm_aspace = bridge->lm_aspace;
 404                 lm_cycle = bridge->lm_cycle;
 405
 406                 /* First make sure that the cycle and address space match */
 407                 if ((lm_aspace == aspace) && (lm_cycle == cycle)) {
 408                         for (i = 0; i < lm->monitors; i++) {
 409                                 /* Each location monitor covers 8 bytes */
 410                                 if (((lm_base + (8 * i)) <= addr) &&
 411                                     ((lm_base + (8 * i) + 8) > addr)) {
 412                                         if (bridge->lm_callback[i] != NULL)
 413                                                 bridge->lm_callback[i](
 414                                                         bridge->lm_data[i]);
 415                                 }
 416                         }
 417                 }
 418         }
 419 }
 420
 421 static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
 422                 u32 aspace, u32 cycle)
 423 {
 424         u8 retval = 0xff;
 425         int i;
 426         unsigned long long start, end, offset;
 427         u8 *loc;
 428
 429         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 430                 start = bridge->slaves[i].vme_base;
 431                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 432
 433                 if (aspace != bridge->slaves[i].aspace)
 434                         continue;
 435
 436                 if (cycle != bridge->slaves[i].cycle)
 437                         continue;
 438
 439                 if ((addr >= start) && (addr < end)) {
 440                         offset = addr - bridge->slaves[i].vme_base;
 441                         loc = (u8 *)(bridge->slaves[i].buf_base + offset);
 442                         retval = *loc;
 443
 444                         break;
 445                 }
 446         }
 447
 448         fake_lm_check(bridge, addr, aspace, cycle);
 449
 450         return retval;
 451 }
 452
 453 static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
 454                 u32 aspace, u32 cycle)
 455 {
 456         u16 retval = 0xffff;
 457         int i;
 458         unsigned long long start, end, offset;
 459         u16 *loc;
 460
 461         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 462                 if (aspace != bridge->slaves[i].aspace)
 463                         continue;
 464
 465                 if (cycle != bridge->slaves[i].cycle)
 466                         continue;
 467
 468                 start = bridge->slaves[i].vme_base;
 469                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 470
 471                 if ((addr >= start) && ((addr + 1) < end)) {
 472                         offset = addr - bridge->slaves[i].vme_base;
 473                         loc = (u16 *)(bridge->slaves[i].buf_base + offset);
 474                         retval = *loc;
 475
 476                         break;
 477                 }
 478         }
 479
 480         fake_lm_check(bridge, addr, aspace, cycle);
 481
 482         return retval;
 483 }
 484
 485 static u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr,
 486                 u32 aspace, u32 cycle)
 487 {
 488         u32 retval = 0xffffffff;
 489         int i;
 490         unsigned long long start, end, offset;
 491         u32 *loc;
 492
 493         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 494                 if (aspace != bridge->slaves[i].aspace)
 495                         continue;
 496
 497                 if (cycle != bridge->slaves[i].cycle)
 498                         continue;
 499
 500                 start = bridge->slaves[i].vme_base;
 501                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 502
 503                 if ((addr >= start) && ((addr + 3) < end)) {
 504                         offset = addr - bridge->slaves[i].vme_base;
 505                         loc = (u32 *)(bridge->slaves[i].buf_base + offset);
 506                         retval = *loc;
 507
 508                         break;
 509                 }
 510         }
 511
 512         fake_lm_check(bridge, addr, aspace, cycle);
 513
 514         return retval;
 515 }
 516
 517 static ssize_t fake_master_read(struct vme_master_resource *image, void *buf,
 518                 size_t count, loff_t offset)
 519 {
 520         int retval;
 521         u32 aspace, cycle, dwidth;
 522         struct vme_bridge *fake_bridge;
 523         struct fake_driver *priv;
 524         int i;
 525         unsigned long long addr;
 526         unsigned int done = 0;
 527         unsigned int count32;
 528
 529         fake_bridge = image->parent;
 530
 531         priv = fake_bridge->driver_priv;
 532
 533         i = image->number;
 534
 535         addr = (unsigned long long)priv->masters[i].vme_base + offset;
 536         aspace = priv->masters[i].aspace;
 537         cycle = priv->masters[i].cycle;
 538         dwidth = priv->masters[i].dwidth;
 539
 540         spin_lock(&image->lock);
 541
 542         /* The following code handles VME address alignment. We cannot use
 543          * memcpy_xxx here because it may cut data transfers in to 8-bit
 544          * cycles when D16 or D32 cycles are required on the VME bus.
 545          * On the other hand, the bridge itself assures that the maximum data
 546          * cycle configured for the transfer is used and splits it
 547          * automatically for non-aligned addresses, so we don't want the
 548          * overhead of needlessly forcing small transfers for the entire cycle.
 549          */
 550         if (addr & 0x1) {
 551                 *(u8 *)buf = fake_vmeread8(priv, addr, aspace, cycle);
 552                 done += 1;
 553                 if (done == count)
 554                         goto out;
 555         }
 556         if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
 557                 if ((addr + done) & 0x2) {
 558                         if ((count - done) < 2) {
 559                                 *(u8 *)(buf + done) = fake_vmeread8(priv,
 560                                                 addr + done, aspace, cycle);
 561                                 done += 1;
 562                                 goto out;
 563                         } else {
 564                                 *(u16 *)(buf + done) = fake_vmeread16(priv,
 565                                                 addr + done, aspace, cycle);
 566                                 done += 2;
 567                         }
 568                 }
 569         }
 570
 571         if (dwidth == VME_D32) {
 572                 count32 = (count - done) & ~0x3;
 573                 while (done < count32) {
 574                         *(u32 *)(buf + done) = fake_vmeread32(priv, addr + done,
 575                                         aspace, cycle);
 576                         done += 4;
 577                 }
 578         } else if (dwidth == VME_D16) {
 579                 count32 = (count - done) & ~0x3;
 580                 while (done < count32) {
 581                         *(u16 *)(buf + done) = fake_vmeread16(priv, addr + done,
 582                                         aspace, cycle);
 583                         done += 2;
 584                 }
 585         } else if (dwidth == VME_D8) {
 586                 count32 = (count - done);
 587                 while (done < count32) {
 588                         *(u8 *)(buf + done) = fake_vmeread8(priv, addr + done,
 589                                         aspace, cycle);
 590                         done += 1;
 591                 }
 592
 593         }
 594
 595         if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
 596                 if ((count - done) & 0x2) {
 597                         *(u16 *)(buf + done) = fake_vmeread16(priv, addr + done,
 598                                         aspace, cycle);
 599                         done += 2;
 600                 }
 601         }
 602         if ((count - done) & 0x1) {
 603                 *(u8 *)(buf + done) = fake_vmeread8(priv, addr + done, aspace,
 604                                 cycle);
 605                 done += 1;
 606         }
 607
 608 out:
 609         retval = count;
 610
 611         spin_unlock(&image->lock);
 612
 613         return retval;
 614 }
 615
 616 static void fake_vmewrite8(struct fake_driver *bridge, u8 *buf,
 617                            unsigned long long addr, u32 aspace, u32 cycle)
 618 {
 619         int i;
 620         unsigned long long start, end, offset;
 621         u8 *loc;
 622
 623         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 624                 if (aspace != bridge->slaves[i].aspace)
 625                         continue;
 626
 627                 if (cycle != bridge->slaves[i].cycle)
 628                         continue;
 629
 630                 start = bridge->slaves[i].vme_base;
 631                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 632
 633                 if ((addr >= start) && (addr < end)) {
 634                         offset = addr - bridge->slaves[i].vme_base;
 635                         loc = (u8 *)((void *)bridge->slaves[i].buf_base + offset);
 636                         *loc = *buf;
 637
 638                         break;
 639                 }
 640         }
 641
 642         fake_lm_check(bridge, addr, aspace, cycle);
 643
 644 }
 645
 646 static void fake_vmewrite16(struct fake_driver *bridge, u16 *buf,
 647                             unsigned long long addr, u32 aspace, u32 cycle)
 648 {
 649         int i;
 650         unsigned long long start, end, offset;
 651         u16 *loc;
 652
 653         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 654                 if (aspace != bridge->slaves[i].aspace)
 655                         continue;
 656
 657                 if (cycle != bridge->slaves[i].cycle)
 658                         continue;
 659
 660                 start = bridge->slaves[i].vme_base;
 661                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 662
 663                 if ((addr >= start) && ((addr + 1) < end)) {
 664                         offset = addr - bridge->slaves[i].vme_base;
 665                         loc = (u16 *)((void *)bridge->slaves[i].buf_base + offset);
 666                         *loc = *buf;
 667
 668                         break;
 669                 }
 670         }
 671
 672         fake_lm_check(bridge, addr, aspace, cycle);
 673
 674 }
 675
 676 static void fake_vmewrite32(struct fake_driver *bridge, u32 *buf,
 677                             unsigned long long addr, u32 aspace, u32 cycle)
 678 {
 679         int i;
 680         unsigned long long start, end, offset;
 681         u32 *loc;
 682
 683         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
 684                 if (aspace != bridge->slaves[i].aspace)
 685                         continue;
 686
 687                 if (cycle != bridge->slaves[i].cycle)
 688                         continue;
 689
 690                 start = bridge->slaves[i].vme_base;
 691                 end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
 692
 693                 if ((addr >= start) && ((addr + 3) < end)) {
 694                         offset = addr - bridge->slaves[i].vme_base;
 695                         loc = (u32 *)((void *)bridge->slaves[i].buf_base + offset);
 696                         *loc = *buf;
 697
 698                         break;
 699                 }
 700         }
 701
 702         fake_lm_check(bridge, addr, aspace, cycle);
 703
 704 }
 705
 706 static ssize_t fake_master_write(struct vme_master_resource *image, void *buf,
 707                 size_t count, loff_t offset)
 708 {
 709         int retval = 0;
 710         u32 aspace, cycle, dwidth;
 711         unsigned long long addr;
 712         int i;
 713         unsigned int done = 0;
 714         unsigned int count32;
 715
 716         struct vme_bridge *fake_bridge;
 717         struct fake_driver *bridge;
 718
 719         fake_bridge = image->parent;
 720
 721         bridge = fake_bridge->driver_priv;
 722
 723         i = image->number;
 724
 725         addr = bridge->masters[i].vme_base + offset;
 726         aspace = bridge->masters[i].aspace;
 727         cycle = bridge->masters[i].cycle;
 728         dwidth = bridge->masters[i].dwidth;
 729
 730         spin_lock(&image->lock);
 731
 732         /* Here we apply for the same strategy we do in master_read
 733          * function in order to assure the correct cycles.
 734          */
 735         if (addr & 0x1) {
 736                 fake_vmewrite8(bridge, (u8 *)buf, addr, aspace, cycle);
 737                 done += 1;
 738                 if (done == count)
 739                         goto out;
 740         }
 741
 742         if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
 743                 if ((addr + done) & 0x2) {
 744                         if ((count - done) < 2) {
 745                                 fake_vmewrite8(bridge, (u8 *)(buf + done),
 746                                                 addr + done, aspace, cycle);
 747                                 done += 1;
 748                                 goto out;
 749                         } else {
 750                                 fake_vmewrite16(bridge, (u16 *)(buf + done),
 751                                                 addr + done, aspace, cycle);
 752                                 done += 2;
 753                         }
 754                 }
 755         }
 756
 757         if (dwidth == VME_D32) {
 758                 count32 = (count - done) & ~0x3;
 759                 while (done < count32) {
 760                         fake_vmewrite32(bridge, (u32 *)(buf + done),
 761                                         addr + done, aspace, cycle);
 762                         done += 4;
 763                 }
 764         } else if (dwidth == VME_D16) {
 765                 count32 = (count - done) & ~0x3;
 766                 while (done < count32) {
 767                         fake_vmewrite16(bridge, (u16 *)(buf + done),
 768                                         addr + done, aspace, cycle);
 769                         done += 2;
 770                 }
 771         } else if (dwidth == VME_D8) {
 772                 count32 = (count - done);
 773                 while (done < count32) {
 774                         fake_vmewrite8(bridge, (u8 *)(buf + done), addr + done,
 775                                         aspace, cycle);
 776                         done += 1;
 777                 }
 778
 779         }
 780
 781         if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
 782                 if ((count - done) & 0x2) {
 783                         fake_vmewrite16(bridge, (u16 *)(buf + done),
 784                                         addr + done, aspace, cycle);
 785                         done += 2;
 786                 }
 787         }
 788
 789         if ((count - done) & 0x1) {
 790                 fake_vmewrite8(bridge, (u8 *)(buf + done), addr + done, aspace,
 791                                 cycle);
 792                 done += 1;
 793         }
 794
 795 out:
 796         retval = count;
 797
 798         spin_unlock(&image->lock);
 799
 800         return retval;
 801 }
 802
 803 /*
 804  * Perform an RMW cycle on the VME bus.
 805  *
 806  * Requires a previously configured master window, returns final value.
 807  */
 808 static unsigned int fake_master_rmw(struct vme_master_resource *image,
 809                 unsigned int mask, unsigned int compare, unsigned int swap,
 810                 loff_t offset)
 811 {
 812         u32 tmp, base;
 813         u32 aspace, cycle;
 814         int i;
 815         struct fake_driver *bridge;
 816
 817         bridge = image->parent->driver_priv;
 818
 819         /* Find the PCI address that maps to the desired VME address */
 820         i = image->number;
 821
 822         base = bridge->masters[i].vme_base;
 823         aspace = bridge->masters[i].aspace;
 824         cycle = bridge->masters[i].cycle;
 825
 826         /* Lock image */
 827         spin_lock(&image->lock);
 828
 829         /* Read existing value */
 830         tmp = fake_vmeread32(bridge, base + offset, aspace, cycle);
 831
 832         /* Perform check */
 833         if ((tmp && mask) == (compare && mask)) {
 834                 tmp = tmp | (mask | swap);
 835                 tmp = tmp & (~mask | swap);
 836
 837                 /* Write back */
 838                 fake_vmewrite32(bridge, &tmp, base + offset, aspace, cycle);
 839         }
 840
 841         /* Unlock image */
 842         spin_unlock(&image->lock);
 843
 844         return tmp;
 845 }
 846
 847 /*
 848  * All 4 location monitors reside at the same base - this is therefore a
 849  * system wide configuration.
 850  *
 851  * This does not enable the LM monitor - that should be done when the first
 852  * callback is attached and disabled when the last callback is removed.
 853  */
 854 static int fake_lm_set(struct vme_lm_resource *lm, unsigned long long lm_base,
 855                 u32 aspace, u32 cycle)
 856 {
 857         int i;
 858         struct vme_bridge *fake_bridge;
 859         struct fake_driver *bridge;
 860
 861         fake_bridge = lm->parent;
 862
 863         bridge = fake_bridge->driver_priv;
 864
 865         mutex_lock(&lm->mtx);
 866
 867         /* If we already have a callback attached, we can't move it! */
 868         for (i = 0; i < lm->monitors; i++) {
 869                 if (bridge->lm_callback[i] != NULL) {
 870                         mutex_unlock(&lm->mtx);
 871                         pr_err("Location monitor callback attached, can't reset\n");
 872                         return -EBUSY;
 873                 }
 874         }
 875
 876         switch (aspace) {
 877         case VME_A16:
 878         case VME_A24:
 879         case VME_A32:
 880         case VME_A64:
 881                 break;
 882         default:
 883                 mutex_unlock(&lm->mtx);
 884                 pr_err("Invalid address space\n");
 885                 return -EINVAL;
 886         }
 887
 888         bridge->lm_base = lm_base;
 889         bridge->lm_aspace = aspace;
 890         bridge->lm_cycle = cycle;
 891
 892         mutex_unlock(&lm->mtx);
 893
 894         return 0;
 895 }
 896
 897 /* Get configuration of the callback monitor and return whether it is enabled
 898  * or disabled.
 899  */
 900 static int fake_lm_get(struct vme_lm_resource *lm,
 901                 unsigned long long *lm_base, u32 *aspace, u32 *cycle)
 902 {
 903         struct fake_driver *bridge;
 904
 905         bridge = lm->parent->driver_priv;
 906
 907         mutex_lock(&lm->mtx);
 908
 909         *lm_base = bridge->lm_base;
 910         *aspace = bridge->lm_aspace;
 911         *cycle = bridge->lm_cycle;
 912
 913         mutex_unlock(&lm->mtx);
 914
 915         return bridge->lm_enabled;
 916 }
 917
 918 /*
 919  * Attach a callback to a specific location monitor.
 920  *
 921  * Callback will be passed the monitor triggered.
 922  */
 923 static int fake_lm_attach(struct vme_lm_resource *lm, int monitor,
 924                 void (*callback)(void *), void *data)
 925 {
 926         struct vme_bridge *fake_bridge;
 927         struct fake_driver *bridge;
 928
 929         fake_bridge = lm->parent;
 930
 931         bridge = fake_bridge->driver_priv;
 932
 933         mutex_lock(&lm->mtx);
 934
 935         /* Ensure that the location monitor is configured - need PGM or DATA */
 936         if (bridge->lm_cycle == 0) {
 937                 mutex_unlock(&lm->mtx);
 938                 pr_err("Location monitor not properly configured\n");
 939                 return -EINVAL;
 940         }
 941
 942         /* Check that a callback isn't already attached */
 943         if (bridge->lm_callback[monitor] != NULL) {
 944                 mutex_unlock(&lm->mtx);
 945                 pr_err("Existing callback attached\n");
 946                 return -EBUSY;
 947         }
 948
 949         /* Attach callback */
 950         bridge->lm_callback[monitor] = callback;
 951         bridge->lm_data[monitor] = data;
 952
 953         /* Ensure that global Location Monitor Enable set */
 954         bridge->lm_enabled = 1;
 955
 956         mutex_unlock(&lm->mtx);
 957
 958         return 0;
 959 }
 960
 961 /*
 962  * Detach a callback function forn a specific location monitor.
 963  */
 964 static int fake_lm_detach(struct vme_lm_resource *lm, int monitor)
 965 {
 966         u32 tmp;
 967         int i;
 968         struct fake_driver *bridge;
 969
 970         bridge = lm->parent->driver_priv;
 971
 972         mutex_lock(&lm->mtx);
 973
 974         /* Detach callback */
 975         bridge->lm_callback[monitor] = NULL;
 976         bridge->lm_data[monitor] = NULL;
 977
 978         /* If all location monitors disabled, disable global Location Monitor */
 979         tmp = 0;
 980         for (i = 0; i < lm->monitors; i++) {
 981                 if (bridge->lm_callback[i] != NULL)
 982                         tmp = 1;
 983         }
 984
 985         if (tmp == 0)
 986                 bridge->lm_enabled = 0;
 987
 988         mutex_unlock(&lm->mtx);
 989
 990         return 0;
 991 }
 992
 993 /*
 994  * Determine Geographical Addressing
 995  */
 996 static int fake_slot_get(struct vme_bridge *fake_bridge)
 997 {
 998         return geoid;
 999 }
1000
1001 static void *fake_alloc_consistent(struct device *parent, size_t size,
1002                 dma_addr_t *dma)
1003 {
1004         void *alloc = kmalloc(size, GFP_KERNEL);
1005
1006         if (alloc != NULL)
1007                 *dma = fake_ptr_to_pci(alloc);
1008
1009         return alloc;
1010 }
1011
1012 static void fake_free_consistent(struct device *parent, size_t size,
1013                 void *vaddr, dma_addr_t dma)
1014 {
1015         kfree(vaddr);
1016 /*
1017         dma_free_coherent(parent, size, vaddr, dma);
1018 */
1019 }
1020
1021 /*
1022  * Configure CR/CSR space
1023  *
1024  * Access to the CR/CSR can be configured at power-up. The location of the
1025  * CR/CSR registers in the CR/CSR address space is determined by the boards
1026  * Geographic address.
1027  *
1028  * Each board has a 512kB window, with the highest 4kB being used for the
1029  * boards registers, this means there is a fix length 508kB window which must
1030  * be mapped onto PCI memory.
1031  */
1032 static int fake_crcsr_init(struct vme_bridge *fake_bridge)
1033 {
1034         u32 vstat;
1035         struct fake_driver *bridge;
1036
1037         bridge = fake_bridge->driver_priv;
1038
1039         /* Allocate mem for CR/CSR image */
1040         bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
1041         bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
1042         if (bridge->crcsr_kernel == NULL)
1043                 return -ENOMEM;
1044
1045         vstat = fake_slot_get(fake_bridge);
1046
1047         pr_info("CR/CSR Offset: %d\n", vstat);
1048
1049         return 0;
1050 }
1051
1052 static void fake_crcsr_exit(struct vme_bridge *fake_bridge)
1053 {
1054         struct fake_driver *bridge;
1055
1056         bridge = fake_bridge->driver_priv;
1057
1058         kfree(bridge->crcsr_kernel);
1059 }
1060
1061
1062 static int __init fake_init(void)
1063 {
1064         int retval, i;
1065         struct list_head *pos = NULL, *n;
1066         struct vme_bridge *fake_bridge;
1067         struct fake_driver *fake_device;
1068         struct vme_master_resource *master_image;
1069         struct vme_slave_resource *slave_image;
1070         struct vme_lm_resource *lm;
1071
1072         /* We need a fake parent device */
1073         vme_root = __root_device_register("vme", THIS_MODULE);
1074
1075         /* If we want to support more than one bridge at some point, we need to
1076          * dynamically allocate this so we get one per device.
1077          */
1078         fake_bridge = kzalloc(sizeof(struct vme_bridge), GFP_KERNEL);
1079         if (fake_bridge == NULL) {
1080                 retval = -ENOMEM;
1081                 goto err_struct;
1082         }
1083
1084         fake_device = kzalloc(sizeof(struct fake_driver), GFP_KERNEL);
1085         if (fake_device == NULL) {
1086                 retval = -ENOMEM;
1087                 goto err_driver;
1088         }
1089
1090         fake_bridge->driver_priv = fake_device;
1091
1092         fake_bridge->parent = vme_root;
1093
1094         fake_device->parent = fake_bridge;
1095
1096         /* Initialize wait queues & mutual exclusion flags */
1097         mutex_init(&fake_device->vme_int);
1098         mutex_init(&fake_bridge->irq_mtx);
1099         tasklet_init(&fake_device->int_tasklet, fake_VIRQ_tasklet,
1100                         (unsigned long) fake_bridge);
1101
1102         strcpy(fake_bridge->name, driver_name);
1103
1104         /* Add master windows to list */
1105         INIT_LIST_HEAD(&fake_bridge->master_resources);
1106         for (i = 0; i < FAKE_MAX_MASTER; i++) {
1107                 master_image = kmalloc(sizeof(struct vme_master_resource),
1108                                 GFP_KERNEL);
1109                 if (master_image == NULL) {
1110                         retval = -ENOMEM;
1111                         goto err_master;
1112                 }
1113                 master_image->parent = fake_bridge;
1114                 spin_lock_init(&master_image->lock);
1115                 master_image->locked = 0;
1116                 master_image->number = i;
1117                 master_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
1118                         VME_A64;
1119                 master_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
1120                         VME_2eVME | VME_2eSST | VME_2eSSTB | VME_2eSST160 |
1121                         VME_2eSST267 | VME_2eSST320 | VME_SUPER | VME_USER |
1122                         VME_PROG | VME_DATA;
1123                 master_image->width_attr = VME_D16 | VME_D32;
1124                 memset(&master_image->bus_resource, 0,
1125                                 sizeof(struct resource));
1126                 master_image->kern_base  = NULL;
1127                 list_add_tail(&master_image->list,
1128                                 &fake_bridge->master_resources);
1129         }
1130
1131         /* Add slave windows to list */
1132         INIT_LIST_HEAD(&fake_bridge->slave_resources);
1133         for (i = 0; i < FAKE_MAX_SLAVE; i++) {
1134                 slave_image = kmalloc(sizeof(struct vme_slave_resource),
1135                                 GFP_KERNEL);
1136                 if (slave_image == NULL) {
1137                         retval = -ENOMEM;
1138                         goto err_slave;
1139                 }
1140                 slave_image->parent = fake_bridge;
1141                 mutex_init(&slave_image->mtx);
1142                 slave_image->locked = 0;
1143                 slave_image->number = i;
1144                 slave_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
1145                         VME_A64 | VME_CRCSR | VME_USER1 | VME_USER2 |
1146                         VME_USER3 | VME_USER4;
1147                 slave_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
1148                         VME_2eVME | VME_2eSST | VME_2eSSTB | VME_2eSST160 |
1149                         VME_2eSST267 | VME_2eSST320 | VME_SUPER | VME_USER |
1150                         VME_PROG | VME_DATA;
1151                 list_add_tail(&slave_image->list,
1152                                 &fake_bridge->slave_resources);
1153         }
1154
1155         /* Add location monitor to list */
1156         INIT_LIST_HEAD(&fake_bridge->lm_resources);
1157         lm = kmalloc(sizeof(struct vme_lm_resource), GFP_KERNEL);
1158         if (lm == NULL) {
1159                 pr_err("Failed to allocate memory for location monitor resource structure\n");
1160                 retval = -ENOMEM;
1161                 goto err_lm;
1162         }
1163         lm->parent = fake_bridge;
1164         mutex_init(&lm->mtx);
1165         lm->locked = 0;
1166         lm->number = 1;
1167         lm->monitors = 4;
1168         list_add_tail(&lm->list, &fake_bridge->lm_resources);
1169
1170         fake_bridge->slave_get = fake_slave_get;
1171         fake_bridge->slave_set = fake_slave_set;
1172         fake_bridge->master_get = fake_master_get;
1173         fake_bridge->master_set = fake_master_set;
1174         fake_bridge->master_read = fake_master_read;
1175         fake_bridge->master_write = fake_master_write;
1176         fake_bridge->master_rmw = fake_master_rmw;
1177         fake_bridge->irq_set = fake_irq_set;
1178         fake_bridge->irq_generate = fake_irq_generate;
1179         fake_bridge->lm_set = fake_lm_set;
1180         fake_bridge->lm_get = fake_lm_get;
1181         fake_bridge->lm_attach = fake_lm_attach;
1182         fake_bridge->lm_detach = fake_lm_detach;
1183         fake_bridge->slot_get = fake_slot_get;
1184         fake_bridge->alloc_consistent = fake_alloc_consistent;
1185         fake_bridge->free_consistent = fake_free_consistent;
1186
1187         pr_info("Board is%s the VME system controller\n",
1188                         (geoid == 1) ? "" : " not");
1189
1190         pr_info("VME geographical address is set to %d\n", geoid);
1191
1192         retval = fake_crcsr_init(fake_bridge);
1193         if (retval) {
1194                 pr_err("CR/CSR configuration failed.\n");
1195                 goto err_crcsr;
1196         }
1197
1198         retval = vme_register_bridge(fake_bridge);
1199         if (retval != 0) {
1200                 pr_err("Chip Registration failed.\n");
1201                 goto err_reg;
1202         }
1203
1204         exit_pointer = fake_bridge;
1205
1206         return 0;
1207
1208 err_reg:
1209         fake_crcsr_exit(fake_bridge);
1210 err_crcsr:
1211 err_lm:
1212         /* resources are stored in link list */
1213         list_for_each_safe(pos, n, &fake_bridge->lm_resources) {
1214                 lm = list_entry(pos, struct vme_lm_resource, list);
1215                 list_del(pos);
1216                 kfree(lm);
1217         }
1218 err_slave:
1219         /* resources are stored in link list */
1220         list_for_each_safe(pos, n, &fake_bridge->slave_resources) {
1221                 slave_image = list_entry(pos, struct vme_slave_resource, list);
1222                 list_del(pos);
1223                 kfree(slave_image);
1224         }
1225 err_master:
1226         /* resources are stored in link list */
1227         list_for_each_safe(pos, n, &fake_bridge->master_resources) {
1228                 master_image = list_entry(pos, struct vme_master_resource,
1229                                 list);
1230                 list_del(pos);
1231                 kfree(master_image);
1232         }
1233
1234         kfree(fake_device);
1235 err_driver:
1236         kfree(fake_bridge);
1237 err_struct:
1238         return retval;
1239
1240 }
1241
1242
1243 static void __exit fake_exit(void)
1244 {
1245         struct list_head *pos = NULL;
1246         struct list_head *tmplist;
1247         struct vme_master_resource *master_image;
1248         struct vme_slave_resource *slave_image;
1249         int i;
1250         struct vme_bridge *fake_bridge;
1251         struct fake_driver *bridge;
1252
1253         fake_bridge = exit_pointer;
1254
1255         bridge = fake_bridge->driver_priv;
1256
1257         pr_debug("Driver is being unloaded.\n");
1258
1259         /*
1260          *  Shutdown all inbound and outbound windows.
1261          */
1262         for (i = 0; i < FAKE_MAX_MASTER; i++)
1263                 bridge->masters[i].enabled = 0;
1264
1265         for (i = 0; i < FAKE_MAX_SLAVE; i++)
1266                 bridge->slaves[i].enabled = 0;
1267
1268         /*
1269          *  Shutdown Location monitor.
1270          */
1271         bridge->lm_enabled = 0;
1272
1273         vme_unregister_bridge(fake_bridge);
1274
1275         fake_crcsr_exit(fake_bridge);
1276         /* resources are stored in link list */
1277         list_for_each_safe(pos, tmplist, &fake_bridge->slave_resources) {
1278                 slave_image = list_entry(pos, struct vme_slave_resource, list);
1279                 list_del(pos);
1280                 kfree(slave_image);
1281         }
1282
1283         /* resources are stored in link list */
1284         list_for_each_safe(pos, tmplist, &fake_bridge->master_resources) {
1285                 master_image = list_entry(pos, struct vme_master_resource,
1286                                 list);
1287                 list_del(pos);
1288                 kfree(master_image);
1289         }
1290
1291         kfree(fake_bridge->driver_priv);
1292
1293         kfree(fake_bridge);
1294
1295         root_device_unregister(vme_root);
1296 }
1297
1298
1299 MODULE_PARM_DESC(geoid, "Set geographical addressing");
1300 module_param(geoid, int, 0);
1301
1302 MODULE_DESCRIPTION("Fake VME bridge driver");
1303 MODULE_LICENSE("GPL");
1304
1305 module_init(fake_init);
1306 module_exit(fake_exit);