drivers/staging/vme/devices/vme_user.c

   1 /*
   2  * VMEbus User access driver
   3  *
   4  * Author: Martyn Welch <martyn.welch@ge.com>
   5  * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
   6  *
   7  * Based on work by:
   8  *   Tom Armistead and Ajit Prem
   9  *     Copyright 2004 Motorola Inc.
  10  *
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/cdev.h>
  21 #include <linux/delay.h>
  22 #include <linux/device.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/errno.h>
  25 #include <linux/init.h>
  26 #include <linux/ioctl.h>
  27 #include <linux/kernel.h>
  28 #include <linux/mm.h>
  29 #include <linux/module.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/pci.h>
  32 #include <linux/mutex.h>
  33 #include <linux/slab.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/syscalls.h>
  36 #include <linux/types.h>
  37
  38 #include <linux/io.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/vme.h>
  41
  42 #include "vme_user.h"
  43
  44 static DEFINE_MUTEX(vme_user_mutex);
  45 static const char driver_name[] = "vme_user";
  46
  47 static int bus[VME_USER_BUS_MAX];
  48 static unsigned int bus_num;
  49
  50 /* Currently Documentation/devices.txt defines the following for VME:
  51  *
  52  * 221 char     VME bus
  53  *                0 = /dev/bus/vme/m0           First master image
  54  *                1 = /dev/bus/vme/m1           Second master image
  55  *                2 = /dev/bus/vme/m2           Third master image
  56  *                3 = /dev/bus/vme/m3           Fourth master image
  57  *                4 = /dev/bus/vme/s0           First slave image
  58  *                5 = /dev/bus/vme/s1           Second slave image
  59  *                6 = /dev/bus/vme/s2           Third slave image
  60  *                7 = /dev/bus/vme/s3           Fourth slave image
  61  *                8 = /dev/bus/vme/ctl          Control
  62  *
  63  *              It is expected that all VME bus drivers will use the
  64  *              same interface.  For interface documentation see
  65  *              http://www.vmelinux.org/.
  66  *
  67  * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
  68  * even support the tsi148 chipset (which has 8 master and 8 slave windows).
  69  * We'll run with this for now as far as possible, however it probably makes
  70  * sense to get rid of the old mappings and just do everything dynamically.
  71  *
  72  * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
  73  * defined above and try to support at least some of the interface from
  74  * http://www.vmelinux.org/ as an alternative the driver can be written
  75  * providing a saner interface later.
  76  *
  77  * The vmelinux.org driver never supported slave images, the devices reserved
  78  * for slaves were repurposed to support all 8 master images on the UniverseII!
  79  * We shall support 4 masters and 4 slaves with this driver.
  80  */
  81 #define VME_MAJOR       221     /* VME Major Device Number */
  82 #define VME_DEVS        9       /* Number of dev entries */
  83
  84 #define MASTER_MINOR    0
  85 #define MASTER_MAX      3
  86 #define SLAVE_MINOR     4
  87 #define SLAVE_MAX       7
  88 #define CONTROL_MINOR   8
  89
  90 #define PCI_BUF_SIZE  0x20000   /* Size of one slave image buffer */
  91
  92 /*
  93  * Structure to handle image related parameters.
  94  */
  95 struct image_desc {
  96         void *kern_buf; /* Buffer address in kernel space */
  97         dma_addr_t pci_buf;     /* Buffer address in PCI address space */
  98         unsigned long long size_buf;    /* Buffer size */
  99         struct mutex mutex;     /* Mutex for locking image */
 100         struct device *device;  /* Sysfs device */
 101         struct vme_resource *resource;  /* VME resource */
 102         int users;              /* Number of current users */
 103 };
 104 static struct image_desc image[VME_DEVS];
 105
 106 struct driver_stats {
 107         unsigned long reads;
 108         unsigned long writes;
 109         unsigned long ioctls;
 110         unsigned long irqs;
 111         unsigned long berrs;
 112         unsigned long dmaerrors;
 113         unsigned long timeouts;
 114         unsigned long external;
 115 };
 116 static struct driver_stats statistics;
 117
 118 static struct cdev *vme_user_cdev;              /* Character device */
 119 static struct class *vme_user_sysfs_class;      /* Sysfs class */
 120 static struct vme_dev *vme_user_bridge;         /* Pointer to user device */
 121
 122
 123 static const int type[VME_DEVS] = {     MASTER_MINOR,   MASTER_MINOR,
 124                                         MASTER_MINOR,   MASTER_MINOR,
 125                                         SLAVE_MINOR,    SLAVE_MINOR,
 126                                         SLAVE_MINOR,    SLAVE_MINOR,
 127                                         CONTROL_MINOR
 128                                 };
 129
 130
 131 static int vme_user_open(struct inode *, struct file *);
 132 static int vme_user_release(struct inode *, struct file *);
 133 static ssize_t vme_user_read(struct file *, char __user *, size_t, loff_t *);
 134 static ssize_t vme_user_write(struct file *, const char __user *, size_t,
 135         loff_t *);
 136 static loff_t vme_user_llseek(struct file *, loff_t, int);
 137 static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);
 138
 139 static int vme_user_match(struct vme_dev *);
 140 static int vme_user_probe(struct vme_dev *);
 141 static int vme_user_remove(struct vme_dev *);
 142
 143 static const struct file_operations vme_user_fops = {
 144         .open = vme_user_open,
 145         .release = vme_user_release,
 146         .read = vme_user_read,
 147         .write = vme_user_write,
 148         .llseek = vme_user_llseek,
 149         .unlocked_ioctl = vme_user_unlocked_ioctl,
 150         .compat_ioctl = vme_user_unlocked_ioctl,
 151 };
 152
 153
 154 /*
 155  * Reset all the statistic counters
 156  */
 157 static void reset_counters(void)
 158 {
 159         statistics.reads = 0;
 160         statistics.writes = 0;
 161         statistics.ioctls = 0;
 162         statistics.irqs = 0;
 163         statistics.berrs = 0;
 164         statistics.dmaerrors = 0;
 165         statistics.timeouts = 0;
 166 }
 167
 168 static int vme_user_open(struct inode *inode, struct file *file)
 169 {
 170         int err;
 171         unsigned int minor = MINOR(inode->i_rdev);
 172
 173         mutex_lock(&image[minor].mutex);
 174         /* Allow device to be opened if a resource is needed and allocated. */
 175         if (minor < CONTROL_MINOR && image[minor].resource == NULL) {
 176                 pr_err("No resources allocated for device\n");
 177                 err = -EINVAL;
 178                 goto err_res;
 179         }
 180
 181         /* Increment user count */
 182         image[minor].users++;
 183
 184         mutex_unlock(&image[minor].mutex);
 185
 186         return 0;
 187
 188 err_res:
 189         mutex_unlock(&image[minor].mutex);
 190
 191         return err;
 192 }
 193
 194 static int vme_user_release(struct inode *inode, struct file *file)
 195 {
 196         unsigned int minor = MINOR(inode->i_rdev);
 197
 198         mutex_lock(&image[minor].mutex);
 199
 200         /* Decrement user count */
 201         image[minor].users--;
 202
 203         mutex_unlock(&image[minor].mutex);
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * We are going ot alloc a page during init per window for small transfers.
 210  * Small transfers will go VME -> buffer -> user space. Larger (more than a
 211  * page) transfers will lock the user space buffer into memory and then
 212  * transfer the data directly into the user space buffers.
 213  */
 214 static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
 215         loff_t *ppos)
 216 {
 217         ssize_t retval;
 218         ssize_t copied = 0;
 219
 220         if (count <= image[minor].size_buf) {
 221                 /* We copy to kernel buffer */
 222                 copied = vme_master_read(image[minor].resource,
 223                         image[minor].kern_buf, count, *ppos);
 224                 if (copied < 0)
 225                         return (int)copied;
 226
 227                 retval = __copy_to_user(buf, image[minor].kern_buf,
 228                         (unsigned long)copied);
 229                 if (retval != 0) {
 230                         copied = (copied - retval);
 231                         pr_info("User copy failed\n");
 232                         return -EINVAL;
 233                 }
 234
 235         } else {
 236                 /* XXX Need to write this */
 237                 pr_info("Currently don't support large transfers\n");
 238                 /* Map in pages from userspace */
 239
 240                 /* Call vme_master_read to do the transfer */
 241                 return -EINVAL;
 242         }
 243
 244         return copied;
 245 }
 246
 247 /*
 248  * We are going to alloc a page during init per window for small transfers.
 249  * Small transfers will go user space -> buffer -> VME. Larger (more than a
 250  * page) transfers will lock the user space buffer into memory and then
 251  * transfer the data directly from the user space buffers out to VME.
 252  */
 253 static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
 254         size_t count, loff_t *ppos)
 255 {
 256         ssize_t retval;
 257         ssize_t copied = 0;
 258
 259         if (count <= image[minor].size_buf) {
 260                 retval = __copy_from_user(image[minor].kern_buf, buf,
 261                         (unsigned long)count);
 262                 if (retval != 0)
 263                         copied = (copied - retval);
 264                 else
 265                         copied = count;
 266
 267                 copied = vme_master_write(image[minor].resource,
 268                         image[minor].kern_buf, copied, *ppos);
 269         } else {
 270                 /* XXX Need to write this */
 271                 pr_info("Currently don't support large transfers\n");
 272                 /* Map in pages from userspace */
 273
 274                 /* Call vme_master_write to do the transfer */
 275                 return -EINVAL;
 276         }
 277
 278         return copied;
 279 }
 280
 281 static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
 282         size_t count, loff_t *ppos)
 283 {
 284         void *image_ptr;
 285         ssize_t retval;
 286
 287         image_ptr = image[minor].kern_buf + *ppos;
 288
 289         retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
 290         if (retval != 0) {
 291                 retval = (count - retval);
 292                 pr_warn("Partial copy to userspace\n");
 293         } else
 294                 retval = count;
 295
 296         /* Return number of bytes successfully read */
 297         return retval;
 298 }
 299
 300 static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
 301         size_t count, loff_t *ppos)
 302 {
 303         void *image_ptr;
 304         size_t retval;
 305
 306         image_ptr = image[minor].kern_buf + *ppos;
 307
 308         retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
 309         if (retval != 0) {
 310                 retval = (count - retval);
 311                 pr_warn("Partial copy to userspace\n");
 312         } else
 313                 retval = count;
 314
 315         /* Return number of bytes successfully read */
 316         return retval;
 317 }
 318
 319 static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count,
 320                         loff_t *ppos)
 321 {
 322         unsigned int minor = MINOR(file_inode(file)->i_rdev);
 323         ssize_t retval;
 324         size_t image_size;
 325         size_t okcount;
 326
 327         if (minor == CONTROL_MINOR)
 328                 return 0;
 329
 330         mutex_lock(&image[minor].mutex);
 331
 332         /* XXX Do we *really* want this helper - we can use vme_*_get ? */
 333         image_size = vme_get_size(image[minor].resource);
 334
 335         /* Ensure we are starting at a valid location */
 336         if ((*ppos < 0) || (*ppos > (image_size - 1))) {
 337                 mutex_unlock(&image[minor].mutex);
 338                 return 0;
 339         }
 340
 341         /* Ensure not reading past end of the image */
 342         if (*ppos + count > image_size)
 343                 okcount = image_size - *ppos;
 344         else
 345                 okcount = count;
 346
 347         switch (type[minor]) {
 348         case MASTER_MINOR:
 349                 retval = resource_to_user(minor, buf, okcount, ppos);
 350                 break;
 351         case SLAVE_MINOR:
 352                 retval = buffer_to_user(minor, buf, okcount, ppos);
 353                 break;
 354         default:
 355                 retval = -EINVAL;
 356         }
 357
 358         mutex_unlock(&image[minor].mutex);
 359         if (retval > 0)
 360                 *ppos += retval;
 361
 362         return retval;
 363 }
 364
 365 static ssize_t vme_user_write(struct file *file, const char __user *buf,
 366                         size_t count, loff_t *ppos)
 367 {
 368         unsigned int minor = MINOR(file_inode(file)->i_rdev);
 369         ssize_t retval;
 370         size_t image_size;
 371         size_t okcount;
 372
 373         if (minor == CONTROL_MINOR)
 374                 return 0;
 375
 376         mutex_lock(&image[minor].mutex);
 377
 378         image_size = vme_get_size(image[minor].resource);
 379
 380         /* Ensure we are starting at a valid location */
 381         if ((*ppos < 0) || (*ppos > (image_size - 1))) {
 382                 mutex_unlock(&image[minor].mutex);
 383                 return 0;
 384         }
 385
 386         /* Ensure not reading past end of the image */
 387         if (*ppos + count > image_size)
 388                 okcount = image_size - *ppos;
 389         else
 390                 okcount = count;
 391
 392         switch (type[minor]) {
 393         case MASTER_MINOR:
 394                 retval = resource_from_user(minor, buf, okcount, ppos);
 395                 break;
 396         case SLAVE_MINOR:
 397                 retval = buffer_from_user(minor, buf, okcount, ppos);
 398                 break;
 399         default:
 400                 retval = -EINVAL;
 401         }
 402
 403         mutex_unlock(&image[minor].mutex);
 404
 405         if (retval > 0)
 406                 *ppos += retval;
 407
 408         return retval;
 409 }
 410
 411 static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
 412 {
 413         loff_t absolute = -1;
 414         unsigned int minor = MINOR(file_inode(file)->i_rdev);
 415         size_t image_size;
 416
 417         if (minor == CONTROL_MINOR)
 418                 return -EINVAL;
 419
 420         mutex_lock(&image[minor].mutex);
 421         image_size = vme_get_size(image[minor].resource);
 422
 423         switch (whence) {
 424         case SEEK_SET:
 425                 absolute = off;
 426                 break;
 427         case SEEK_CUR:
 428                 absolute = file->f_pos + off;
 429                 break;
 430         case SEEK_END:
 431                 absolute = image_size + off;
 432                 break;
 433         default:
 434                 mutex_unlock(&image[minor].mutex);
 435                 return -EINVAL;
 436                 break;
 437         }
 438
 439         if ((absolute < 0) || (absolute >= image_size)) {
 440                 mutex_unlock(&image[minor].mutex);
 441                 return -EINVAL;
 442         }
 443
 444         file->f_pos = absolute;
 445
 446         mutex_unlock(&image[minor].mutex);
 447
 448         return absolute;
 449 }
 450
 451 /*
 452  * The ioctls provided by the old VME access method (the one at vmelinux.org)
 453  * are most certainly wrong as the effectively push the registers layout
 454  * through to user space. Given that the VME core can handle multiple bridges,
 455  * with different register layouts this is most certainly not the way to go.
 456  *
 457  * We aren't using the structures defined in the Motorola driver either - these
 458  * are also quite low level, however we should use the definitions that have
 459  * already been defined.
 460  */
 461 static int vme_user_ioctl(struct inode *inode, struct file *file,
 462         unsigned int cmd, unsigned long arg)
 463 {
 464         struct vme_master master;
 465         struct vme_slave slave;
 466         struct vme_irq_id irq_req;
 467         unsigned long copied;
 468         unsigned int minor = MINOR(inode->i_rdev);
 469         int retval;
 470         dma_addr_t pci_addr;
 471         void __user *argp = (void __user *)arg;
 472
 473         statistics.ioctls++;
 474
 475         switch (type[minor]) {
 476         case CONTROL_MINOR:
 477                 switch (cmd) {
 478                 case VME_IRQ_GEN:
 479                         copied = copy_from_user(&irq_req, argp,
 480                                                 sizeof(struct vme_irq_id));
 481                         if (copied != 0) {
 482                                 pr_warn("Partial copy from userspace\n");
 483                                 return -EFAULT;
 484                         }
 485
 486                         retval = vme_irq_generate(vme_user_bridge,
 487                                                   irq_req.level,
 488                                                   irq_req.statid);
 489
 490                         return retval;
 491                 }
 492                 break;
 493         case MASTER_MINOR:
 494                 switch (cmd) {
 495                 case VME_GET_MASTER:
 496                         memset(&master, 0, sizeof(struct vme_master));
 497
 498                         /* XXX  We do not want to push aspace, cycle and width
 499                          *      to userspace as they are
 500                          */
 501                         retval = vme_master_get(image[minor].resource,
 502                                 &master.enable, &master.vme_addr,
 503                                 &master.size, &master.aspace,
 504                                 &master.cycle, &master.dwidth);
 505
 506                         copied = copy_to_user(argp, &master,
 507                                 sizeof(struct vme_master));
 508                         if (copied != 0) {
 509                                 pr_warn("Partial copy to userspace\n");
 510                                 return -EFAULT;
 511                         }
 512
 513                         return retval;
 514                         break;
 515
 516                 case VME_SET_MASTER:
 517
 518                         copied = copy_from_user(&master, argp, sizeof(master));
 519                         if (copied != 0) {
 520                                 pr_warn("Partial copy from userspace\n");
 521                                 return -EFAULT;
 522                         }
 523
 524                         /* XXX  We do not want to push aspace, cycle and width
 525                          *      to userspace as they are
 526                          */
 527                         return vme_master_set(image[minor].resource,
 528                                 master.enable, master.vme_addr, master.size,
 529                                 master.aspace, master.cycle, master.dwidth);
 530
 531                         break;
 532                 }
 533                 break;
 534         case SLAVE_MINOR:
 535                 switch (cmd) {
 536                 case VME_GET_SLAVE:
 537                         memset(&slave, 0, sizeof(struct vme_slave));
 538
 539                         /* XXX  We do not want to push aspace, cycle and width
 540                          *      to userspace as they are
 541                          */
 542                         retval = vme_slave_get(image[minor].resource,
 543                                 &slave.enable, &slave.vme_addr,
 544                                 &slave.size, &pci_addr, &slave.aspace,
 545                                 &slave.cycle);
 546
 547                         copied = copy_to_user(argp, &slave,
 548                                 sizeof(struct vme_slave));
 549                         if (copied != 0) {
 550                                 pr_warn("Partial copy to userspace\n");
 551                                 return -EFAULT;
 552                         }
 553
 554                         return retval;
 555                         break;
 556
 557                 case VME_SET_SLAVE:
 558
 559                         copied = copy_from_user(&slave, argp, sizeof(slave));
 560                         if (copied != 0) {
 561                                 pr_warn("Partial copy from userspace\n");
 562                                 return -EFAULT;
 563                         }
 564
 565                         /* XXX  We do not want to push aspace, cycle and width
 566                          *      to userspace as they are
 567                          */
 568                         return vme_slave_set(image[minor].resource,
 569                                 slave.enable, slave.vme_addr, slave.size,
 570                                 image[minor].pci_buf, slave.aspace,
 571                                 slave.cycle);
 572
 573                         break;
 574                 }
 575                 break;
 576         }
 577
 578         return -EINVAL;
 579 }
 580
 581 static long
 582 vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 583 {
 584         int ret;
 585
 586         mutex_lock(&vme_user_mutex);
 587         ret = vme_user_ioctl(file_inode(file), file, cmd, arg);
 588         mutex_unlock(&vme_user_mutex);
 589
 590         return ret;
 591 }
 592
 593
 594 /*
 595  * Unallocate a previously allocated buffer
 596  */
 597 static void buf_unalloc(int num)
 598 {
 599         if (image[num].kern_buf) {
 600 #ifdef VME_DEBUG
 601                 pr_debug("UniverseII:Releasing buffer at %p\n",
 602                          image[num].pci_buf);
 603 #endif
 604
 605                 vme_free_consistent(image[num].resource, image[num].size_buf,
 606                         image[num].kern_buf, image[num].pci_buf);
 607
 608                 image[num].kern_buf = NULL;
 609                 image[num].pci_buf = 0;
 610                 image[num].size_buf = 0;
 611
 612 #ifdef VME_DEBUG
 613         } else {
 614                 pr_debug("UniverseII: Buffer not allocated\n");
 615 #endif
 616         }
 617 }
 618
 619 static struct vme_driver vme_user_driver = {
 620         .name = driver_name,
 621         .match = vme_user_match,
 622         .probe = vme_user_probe,
 623         .remove = vme_user_remove,
 624 };
 625
 626
 627 static int __init vme_user_init(void)
 628 {
 629         int retval = 0;
 630
 631         pr_info("VME User Space Access Driver\n");
 632
 633         if (bus_num == 0) {
 634                 pr_err("No cards, skipping registration\n");
 635                 retval = -ENODEV;
 636                 goto err_nocard;
 637         }
 638
 639         /* Let's start by supporting one bus, we can support more than one
 640          * in future revisions if that ever becomes necessary.
 641          */
 642         if (bus_num > VME_USER_BUS_MAX) {
 643                 pr_err("Driver only able to handle %d buses\n",
 644                        VME_USER_BUS_MAX);
 645                 bus_num = VME_USER_BUS_MAX;
 646         }
 647
 648         /*
 649          * Here we just register the maximum number of devices we can and
 650          * leave vme_user_match() to allow only 1 to go through to probe().
 651          * This way, if we later want to allow multiple user access devices,
 652          * we just change the code in vme_user_match().
 653          */
 654         retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS);
 655         if (retval != 0)
 656                 goto err_reg;
 657
 658         return retval;
 659
 660 err_reg:
 661 err_nocard:
 662         return retval;
 663 }
 664
 665 static int vme_user_match(struct vme_dev *vdev)
 666 {
 667         int i;
 668
 669         int cur_bus = vme_bus_num(vdev);
 670         int cur_slot = vme_slot_num(vdev);
 671
 672         for (i = 0; i < bus_num; i++)
 673                 if ((cur_bus == bus[i]) && (cur_slot == vdev->num))
 674                         return 1;
 675
 676         return 0;
 677 }
 678
 679 /*
 680  * In this simple access driver, the old behaviour is being preserved as much
 681  * as practical. We will therefore reserve the buffers and request the images
 682  * here so that we don't have to do it later.
 683  */
 684 static int vme_user_probe(struct vme_dev *vdev)
 685 {
 686         int i, err;
 687         char *name;
 688
 689         /* Save pointer to the bridge device */
 690         if (vme_user_bridge != NULL) {
 691                 dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n");
 692                 err = -EINVAL;
 693                 goto err_dev;
 694         }
 695         vme_user_bridge = vdev;
 696
 697         /* Initialise descriptors */
 698         for (i = 0; i < VME_DEVS; i++) {
 699                 image[i].kern_buf = NULL;
 700                 image[i].pci_buf = 0;
 701                 mutex_init(&image[i].mutex);
 702                 image[i].device = NULL;
 703                 image[i].resource = NULL;
 704                 image[i].users = 0;
 705         }
 706
 707         /* Initialise statistics counters */
 708         reset_counters();
 709
 710         /* Assign major and minor numbers for the driver */
 711         err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
 712                 driver_name);
 713         if (err) {
 714                 dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n",
 715                          VME_MAJOR);
 716                 goto err_region;
 717         }
 718
 719         /* Register the driver as a char device */
 720         vme_user_cdev = cdev_alloc();
 721         if (!vme_user_cdev) {
 722                 err = -ENOMEM;
 723                 goto err_char;
 724         }
 725         vme_user_cdev->ops = &vme_user_fops;
 726         vme_user_cdev->owner = THIS_MODULE;
 727         err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
 728         if (err) {
 729                 dev_warn(&vdev->dev, "cdev_all failed\n");
 730                 goto err_char;
 731         }
 732
 733         /* Request slave resources and allocate buffers (128kB wide) */
 734         for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
 735                 /* XXX Need to properly request attributes */
 736                 /* For ca91cx42 bridge there are only two slave windows
 737                  * supporting A16 addressing, so we request A24 supported
 738                  * by all windows.
 739                  */
 740                 image[i].resource = vme_slave_request(vme_user_bridge,
 741                         VME_A24, VME_SCT);
 742                 if (image[i].resource == NULL) {
 743                         dev_warn(&vdev->dev,
 744                                  "Unable to allocate slave resource\n");
 745                         err = -ENOMEM;
 746                         goto err_slave;
 747                 }
 748                 image[i].size_buf = PCI_BUF_SIZE;
 749                 image[i].kern_buf = vme_alloc_consistent(image[i].resource,
 750                         image[i].size_buf, &image[i].pci_buf);
 751                 if (image[i].kern_buf == NULL) {
 752                         dev_warn(&vdev->dev,
 753                                  "Unable to allocate memory for buffer\n");
 754                         image[i].pci_buf = 0;
 755                         vme_slave_free(image[i].resource);
 756                         err = -ENOMEM;
 757                         goto err_slave;
 758                 }
 759         }
 760
 761         /*
 762          * Request master resources allocate page sized buffers for small
 763          * reads and writes
 764          */
 765         for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
 766                 /* XXX Need to properly request attributes */
 767                 image[i].resource = vme_master_request(vme_user_bridge,
 768                         VME_A32, VME_SCT, VME_D32);
 769                 if (image[i].resource == NULL) {
 770                         dev_warn(&vdev->dev,
 771                                  "Unable to allocate master resource\n");
 772                         err = -ENOMEM;
 773                         goto err_master;
 774                 }
 775                 image[i].size_buf = PCI_BUF_SIZE;
 776                 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
 777                 if (image[i].kern_buf == NULL) {
 778                         err = -ENOMEM;
 779                         vme_master_free(image[i].resource);
 780                         goto err_master;
 781                 }
 782         }
 783
 784         /* Create sysfs entries - on udev systems this creates the dev files */
 785         vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
 786         if (IS_ERR(vme_user_sysfs_class)) {
 787                 dev_err(&vdev->dev, "Error creating vme_user class.\n");
 788                 err = PTR_ERR(vme_user_sysfs_class);
 789                 goto err_class;
 790         }
 791
 792         /* Add sysfs Entries */
 793         for (i = 0; i < VME_DEVS; i++) {
 794                 int num;
 795
 796                 switch (type[i]) {
 797                 case MASTER_MINOR:
 798                         name = "bus/vme/m%d";
 799                         break;
 800                 case CONTROL_MINOR:
 801                         name = "bus/vme/ctl";
 802                         break;
 803                 case SLAVE_MINOR:
 804                         name = "bus/vme/s%d";
 805                         break;
 806                 default:
 807                         err = -EINVAL;
 808                         goto err_sysfs;
 809                         break;
 810                 }
 811
 812                 num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i;
 813                 image[i].device = device_create(vme_user_sysfs_class, NULL,
 814                                         MKDEV(VME_MAJOR, i), NULL, name, num);
 815                 if (IS_ERR(image[i].device)) {
 816                         dev_info(&vdev->dev, "Error creating sysfs device\n");
 817                         err = PTR_ERR(image[i].device);
 818                         goto err_sysfs;
 819                 }
 820         }
 821
 822         return 0;
 823
 824 err_sysfs:
 825         while (i > 0) {
 826                 i--;
 827                 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
 828         }
 829         class_destroy(vme_user_sysfs_class);
 830
 831         /* Ensure counter set correcty to unalloc all master windows */
 832         i = MASTER_MAX + 1;
 833 err_master:
 834         while (i > MASTER_MINOR) {
 835                 i--;
 836                 kfree(image[i].kern_buf);
 837                 vme_master_free(image[i].resource);
 838         }
 839
 840         /*
 841          * Ensure counter set correcty to unalloc all slave windows and buffers
 842          */
 843         i = SLAVE_MAX + 1;
 844 err_slave:
 845         while (i > SLAVE_MINOR) {
 846                 i--;
 847                 buf_unalloc(i);
 848                 vme_slave_free(image[i].resource);
 849         }
 850 err_class:
 851         cdev_del(vme_user_cdev);
 852 err_char:
 853         unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
 854 err_region:
 855 err_dev:
 856         return err;
 857 }
 858
 859 static int vme_user_remove(struct vme_dev *dev)
 860 {
 861         int i;
 862
 863         /* Remove sysfs Entries */
 864         for (i = 0; i < VME_DEVS; i++) {
 865                 mutex_destroy(&image[i].mutex);
 866                 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
 867         }
 868         class_destroy(vme_user_sysfs_class);
 869
 870         for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
 871                 kfree(image[i].kern_buf);
 872                 vme_master_free(image[i].resource);
 873         }
 874
 875         for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
 876                 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
 877                 buf_unalloc(i);
 878                 vme_slave_free(image[i].resource);
 879         }
 880
 881         /* Unregister device driver */
 882         cdev_del(vme_user_cdev);
 883
 884         /* Unregiser the major and minor device numbers */
 885         unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
 886
 887         return 0;
 888 }
 889
 890 static void __exit vme_user_exit(void)
 891 {
 892         vme_unregister_driver(&vme_user_driver);
 893 }
 894
 895
 896 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
 897 module_param_array(bus, int, &bus_num, 0);
 898
 899 MODULE_DESCRIPTION("VME User Space Access Driver");
 900 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
 901 MODULE_LICENSE("GPL");
 902
 903 module_init(vme_user_init);
 904 module_exit(vme_user_exit);