linux/drivers/cdrom/viocd.c
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   1/* -*- linux-c -*-
   2 *  drivers/cdrom/viocd.c
   3 *
   4 *  iSeries Virtual CD Rom
   5 *
   6 *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7 *           Ryan Arnold <ryanarn@us.ibm.com>
   8 *           Colin Devilbiss <devilbis@us.ibm.com>
   9 *           Stephen Rothwell
  10 *
  11 * (C) Copyright 2000-2004 IBM Corporation
  12 *
  13 * This program is free software;  you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License as
  15 * published by the Free Software Foundation; either version 2 of the
  16 * License, or (at your option) anyu later version.
  17 *
  18 * This program is distributed in the hope that it will be useful, but
  19 * WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 * 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 Foundation,
  25 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26 *
  27 * This routine provides access to CD ROM drives owned and managed by an
  28 * OS/400 partition running on the same box as this Linux partition.
  29 *
  30 * All operations are performed by sending messages back and forth to
  31 * the OS/400 partition.
  32 */
  33
  34#include <linux/major.h>
  35#include <linux/blkdev.h>
  36#include <linux/cdrom.h>
  37#include <linux/errno.h>
  38#include <linux/init.h>
  39#include <linux/dma-mapping.h>
  40#include <linux/module.h>
  41#include <linux/completion.h>
  42#include <linux/proc_fs.h>
  43#include <linux/seq_file.h>
  44#include <linux/scatterlist.h>
  45
  46#include <asm/vio.h>
  47#include <asm/iseries/hv_types.h>
  48#include <asm/iseries/hv_lp_event.h>
  49#include <asm/iseries/vio.h>
  50#include <asm/firmware.h>
  51
  52#define VIOCD_DEVICE                    "iseries/vcd"
  53
  54#define VIOCD_VERS "1.06"
  55
  56#define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  57#define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  58
  59/*
  60 * Should probably make this a module parameter....sigh
  61 */
  62#define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  63
  64static const struct vio_error_entry viocd_err_table[] = {
  65        {0x0201, EINVAL, "Invalid Range"},
  66        {0x0202, EINVAL, "Invalid Token"},
  67        {0x0203, EIO, "DMA Error"},
  68        {0x0204, EIO, "Use Error"},
  69        {0x0205, EIO, "Release Error"},
  70        {0x0206, EINVAL, "Invalid CD"},
  71        {0x020C, EROFS, "Read Only Device"},
  72        {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  73        {0x020E, EIO, "Optical System Error (Varied Off?)"},
  74        {0x02FF, EIO, "Internal Error"},
  75        {0x3010, EIO, "Changed Volume"},
  76        {0xC100, EIO, "Optical System Error"},
  77        {0x0000, 0, NULL},
  78};
  79
  80/*
  81 * This is the structure we use to exchange info between driver and interrupt
  82 * handler
  83 */
  84struct viocd_waitevent {
  85        struct completion       com;
  86        int                     rc;
  87        u16                     sub_result;
  88        int                     changed;
  89};
  90
  91/* this is a lookup table for the true capabilities of a device */
  92struct capability_entry {
  93        char    *type;
  94        int     capability;
  95};
  96
  97static struct capability_entry capability_table[] __initdata = {
  98        { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
  99        { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 100        { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 101        { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 102        { "6321", CDC_LOCK },
 103        { "632B", 0 },
 104        { NULL  , CDC_LOCK },
 105};
 106
 107/* These are our internal structures for keeping track of devices */
 108static int viocd_numdev;
 109
 110struct disk_info {
 111        struct gendisk                  *viocd_disk;
 112        struct cdrom_device_info        viocd_info;
 113        struct device                   *dev;
 114        const char                      *rsrcname;
 115        const char                      *type;
 116        const char                      *model;
 117};
 118static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 119
 120#define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 121
 122static spinlock_t viocd_reqlock;
 123
 124#define MAX_CD_REQ      1
 125
 126/* procfs support */
 127static int proc_viocd_show(struct seq_file *m, void *v)
 128{
 129        int i;
 130
 131        for (i = 0; i < viocd_numdev; i++) {
 132                seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 133                                "type %4.4s, model %3.3s\n",
 134                                i, viocd_diskinfo[i].rsrcname,
 135                                viocd_diskinfo[i].type,
 136                                viocd_diskinfo[i].model);
 137        }
 138        return 0;
 139}
 140
 141static int proc_viocd_open(struct inode *inode, struct file *file)
 142{
 143        return single_open(file, proc_viocd_show, NULL);
 144}
 145
 146static const struct file_operations proc_viocd_operations = {
 147        .owner          = THIS_MODULE,
 148        .open           = proc_viocd_open,
 149        .read           = seq_read,
 150        .llseek         = seq_lseek,
 151        .release        = single_release,
 152};
 153
 154static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 155{
 156        struct disk_info *di = bdev->bd_disk->private_data;
 157        return cdrom_open(&di->viocd_info, bdev, mode);
 158}
 159
 160static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 161{
 162        struct disk_info *di = disk->private_data;
 163        cdrom_release(&di->viocd_info, mode);
 164        return 0;
 165}
 166
 167static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 168                unsigned cmd, unsigned long arg)
 169{
 170        struct disk_info *di = bdev->bd_disk->private_data;
 171        return cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
 172}
 173
 174static int viocd_blk_media_changed(struct gendisk *disk)
 175{
 176        struct disk_info *di = disk->private_data;
 177        return cdrom_media_changed(&di->viocd_info);
 178}
 179
 180struct block_device_operations viocd_fops = {
 181        .owner =                THIS_MODULE,
 182        .open =                 viocd_blk_open,
 183        .release =              viocd_blk_release,
 184        .locked_ioctl =         viocd_blk_ioctl,
 185        .media_changed =        viocd_blk_media_changed,
 186};
 187
 188static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 189{
 190        struct disk_info *diskinfo = cdi->handle;
 191        int device_no = DEVICE_NR(diskinfo);
 192        HvLpEvent_Rc hvrc;
 193        struct viocd_waitevent we;
 194
 195        init_completion(&we.com);
 196        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 197                        HvLpEvent_Type_VirtualIo,
 198                        viomajorsubtype_cdio | viocdopen,
 199                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 200                        viopath_sourceinst(viopath_hostLp),
 201                        viopath_targetinst(viopath_hostLp),
 202                        (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 203                        0, 0, 0);
 204        if (hvrc != 0) {
 205                printk(VIOCD_KERN_WARNING
 206                                "bad rc on HvCallEvent_signalLpEventFast %d\n",
 207                                (int)hvrc);
 208                return -EIO;
 209        }
 210
 211        wait_for_completion(&we.com);
 212
 213        if (we.rc) {
 214                const struct vio_error_entry *err =
 215                        vio_lookup_rc(viocd_err_table, we.sub_result);
 216                printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 217                                we.rc, we.sub_result, err->msg);
 218                return -err->errno;
 219        }
 220
 221        return 0;
 222}
 223
 224static void viocd_release(struct cdrom_device_info *cdi)
 225{
 226        int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 227        HvLpEvent_Rc hvrc;
 228
 229        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 230                        HvLpEvent_Type_VirtualIo,
 231                        viomajorsubtype_cdio | viocdclose,
 232                        HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 233                        viopath_sourceinst(viopath_hostLp),
 234                        viopath_targetinst(viopath_hostLp), 0,
 235                        VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 236        if (hvrc != 0)
 237                printk(VIOCD_KERN_WARNING
 238                                "bad rc on HvCallEvent_signalLpEventFast %d\n",
 239                                (int)hvrc);
 240}
 241
 242/* Send a read or write request to OS/400 */
 243static int send_request(struct request *req)
 244{
 245        HvLpEvent_Rc hvrc;
 246        struct disk_info *diskinfo = req->rq_disk->private_data;
 247        u64 len;
 248        dma_addr_t dmaaddr;
 249        int direction;
 250        u16 cmd;
 251        struct scatterlist sg;
 252
 253        BUG_ON(req->nr_phys_segments > 1);
 254
 255        if (rq_data_dir(req) == READ) {
 256                direction = DMA_FROM_DEVICE;
 257                cmd = viomajorsubtype_cdio | viocdread;
 258        } else {
 259                direction = DMA_TO_DEVICE;
 260                cmd = viomajorsubtype_cdio | viocdwrite;
 261        }
 262
 263        sg_init_table(&sg, 1);
 264        if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 265                printk(VIOCD_KERN_WARNING
 266                                "error setting up scatter/gather list\n");
 267                return -1;
 268        }
 269
 270        if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 271                printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 272                return -1;
 273        }
 274        dmaaddr = sg_dma_address(&sg);
 275        len = sg_dma_len(&sg);
 276
 277        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 278                        HvLpEvent_Type_VirtualIo, cmd,
 279                        HvLpEvent_AckInd_DoAck,
 280                        HvLpEvent_AckType_ImmediateAck,
 281                        viopath_sourceinst(viopath_hostLp),
 282                        viopath_targetinst(viopath_hostLp),
 283                        (u64)req, VIOVERSION << 16,
 284                        ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 285                        (u64)req->sector * 512, len, 0);
 286        if (hvrc != HvLpEvent_Rc_Good) {
 287                printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 288                return -1;
 289        }
 290
 291        return 0;
 292}
 293
 294static void viocd_end_request(struct request *req, int error)
 295{
 296        int nsectors = req->hard_nr_sectors;
 297
 298        /*
 299         * Make sure it's fully ended, and ensure that we process
 300         * at least one sector.
 301         */
 302        if (blk_pc_request(req))
 303                nsectors = (req->data_len + 511) >> 9;
 304        if (!nsectors)
 305                nsectors = 1;
 306
 307        if (__blk_end_request(req, error, nsectors << 9))
 308                BUG();
 309}
 310
 311static int rwreq;
 312
 313static void do_viocd_request(struct request_queue *q)
 314{
 315        struct request *req;
 316
 317        while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 318                if (!blk_fs_request(req))
 319                        viocd_end_request(req, -EIO);
 320                else if (send_request(req) < 0) {
 321                        printk(VIOCD_KERN_WARNING
 322                                        "unable to send message to OS/400!");
 323                        viocd_end_request(req, -EIO);
 324                } else
 325                        rwreq++;
 326        }
 327}
 328
 329static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 330{
 331        struct viocd_waitevent we;
 332        HvLpEvent_Rc hvrc;
 333        int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 334
 335        init_completion(&we.com);
 336
 337        /* Send the open event to OS/400 */
 338        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 339                        HvLpEvent_Type_VirtualIo,
 340                        viomajorsubtype_cdio | viocdcheck,
 341                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 342                        viopath_sourceinst(viopath_hostLp),
 343                        viopath_targetinst(viopath_hostLp),
 344                        (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 345                        0, 0, 0);
 346        if (hvrc != 0) {
 347                printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 348                                (int)hvrc);
 349                return -EIO;
 350        }
 351
 352        wait_for_completion(&we.com);
 353
 354        /* Check the return code.  If bad, assume no change */
 355        if (we.rc) {
 356                const struct vio_error_entry *err =
 357                        vio_lookup_rc(viocd_err_table, we.sub_result);
 358                printk(VIOCD_KERN_WARNING
 359                                "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 360                                we.rc, we.sub_result, err->msg);
 361                return 0;
 362        }
 363
 364        return we.changed;
 365}
 366
 367static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 368{
 369        HvLpEvent_Rc hvrc;
 370        u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 371        /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 372        u64 flags = !!locking;
 373        struct viocd_waitevent we;
 374
 375        init_completion(&we.com);
 376
 377        /* Send the lockdoor event to OS/400 */
 378        hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 379                        HvLpEvent_Type_VirtualIo,
 380                        viomajorsubtype_cdio | viocdlockdoor,
 381                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 382                        viopath_sourceinst(viopath_hostLp),
 383                        viopath_targetinst(viopath_hostLp),
 384                        (u64)&we, VIOVERSION << 16,
 385                        (device_no << 48) | (flags << 32), 0, 0, 0);
 386        if (hvrc != 0) {
 387                printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 388                                (int)hvrc);
 389                return -EIO;
 390        }
 391
 392        wait_for_completion(&we.com);
 393
 394        if (we.rc != 0)
 395                return -EIO;
 396        return 0;
 397}
 398
 399static int viocd_packet(struct cdrom_device_info *cdi,
 400                struct packet_command *cgc)
 401{
 402        unsigned int buflen = cgc->buflen;
 403        int ret = -EIO;
 404
 405        switch (cgc->cmd[0]) {
 406        case GPCMD_READ_DISC_INFO:
 407                {
 408                        disc_information *di = (disc_information *)cgc->buffer;
 409
 410                        if (buflen >= 2) {
 411                                di->disc_information_length = cpu_to_be16(1);
 412                                ret = 0;
 413                        }
 414                        if (buflen >= 3)
 415                                di->erasable =
 416                                        (cdi->ops->capability & ~cdi->mask
 417                                         & (CDC_DVD_RAM | CDC_RAM)) != 0;
 418                }
 419                break;
 420        case GPCMD_GET_CONFIGURATION:
 421                if (cgc->cmd[3] == CDF_RWRT) {
 422                        struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 423
 424                        if ((buflen >=
 425                             (sizeof(struct feature_header) + sizeof(*rfd))) &&
 426                            (cdi->ops->capability & ~cdi->mask
 427                             & (CDC_DVD_RAM | CDC_RAM))) {
 428                                rfd->feature_code = cpu_to_be16(CDF_RWRT);
 429                                rfd->curr = 1;
 430                                ret = 0;
 431                        }
 432                }
 433                break;
 434        default:
 435                if (cgc->sense) {
 436                        /* indicate Unknown code */
 437                        cgc->sense->sense_key = 0x05;
 438                        cgc->sense->asc = 0x20;
 439                        cgc->sense->ascq = 0x00;
 440                }
 441                break;
 442        }
 443
 444        cgc->stat = ret;
 445        return ret;
 446}
 447
 448static void restart_all_queues(int first_index)
 449{
 450        int i;
 451
 452        for (i = first_index + 1; i < viocd_numdev; i++)
 453                if (viocd_diskinfo[i].viocd_disk)
 454                        blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 455        for (i = 0; i <= first_index; i++)
 456                if (viocd_diskinfo[i].viocd_disk)
 457                        blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 458}
 459
 460/* This routine handles incoming CD LP events */
 461static void vio_handle_cd_event(struct HvLpEvent *event)
 462{
 463        struct viocdlpevent *bevent;
 464        struct viocd_waitevent *pwe;
 465        struct disk_info *di;
 466        unsigned long flags;
 467        struct request *req;
 468
 469
 470        if (event == NULL)
 471                /* Notification that a partition went away! */
 472                return;
 473        /* First, we should NEVER get an int here...only acks */
 474        if (hvlpevent_is_int(event)) {
 475                printk(VIOCD_KERN_WARNING
 476                                "Yikes! got an int in viocd event handler!\n");
 477                if (hvlpevent_need_ack(event)) {
 478                        event->xRc = HvLpEvent_Rc_InvalidSubtype;
 479                        HvCallEvent_ackLpEvent(event);
 480                }
 481        }
 482
 483        bevent = (struct viocdlpevent *)event;
 484
 485        switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 486        case viocdopen:
 487                if (event->xRc == 0) {
 488                        di = &viocd_diskinfo[bevent->disk];
 489                        blk_queue_hardsect_size(di->viocd_disk->queue,
 490                                        bevent->block_size);
 491                        set_capacity(di->viocd_disk,
 492                                        bevent->media_size *
 493                                        bevent->block_size / 512);
 494                }
 495                /* FALLTHROUGH !! */
 496        case viocdlockdoor:
 497                pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 498return_complete:
 499                pwe->rc = event->xRc;
 500                pwe->sub_result = bevent->sub_result;
 501                complete(&pwe->com);
 502                break;
 503
 504        case viocdcheck:
 505                pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 506                pwe->changed = bevent->flags;
 507                goto return_complete;
 508
 509        case viocdclose:
 510                break;
 511
 512        case viocdwrite:
 513        case viocdread:
 514                /*
 515                 * Since this is running in interrupt mode, we need to
 516                 * make sure we're not stepping on any global I/O operations
 517                 */
 518                di = &viocd_diskinfo[bevent->disk];
 519                spin_lock_irqsave(&viocd_reqlock, flags);
 520                dma_unmap_single(di->dev, bevent->token, bevent->len,
 521                                ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 522                                ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 523                req = (struct request *)bevent->event.xCorrelationToken;
 524                rwreq--;
 525
 526                if (event->xRc != HvLpEvent_Rc_Good) {
 527                        const struct vio_error_entry *err =
 528                                vio_lookup_rc(viocd_err_table,
 529                                                bevent->sub_result);
 530                        printk(VIOCD_KERN_WARNING "request %p failed "
 531                                        "with rc %d:0x%04X: %s\n",
 532                                        req, event->xRc,
 533                                        bevent->sub_result, err->msg);
 534                        viocd_end_request(req, -EIO);
 535                } else
 536                        viocd_end_request(req, 0);
 537
 538                /* restart handling of incoming requests */
 539                spin_unlock_irqrestore(&viocd_reqlock, flags);
 540                restart_all_queues(bevent->disk);
 541                break;
 542
 543        default:
 544                printk(VIOCD_KERN_WARNING
 545                                "message with invalid subtype %0x04X!\n",
 546                                event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 547                if (hvlpevent_need_ack(event)) {
 548                        event->xRc = HvLpEvent_Rc_InvalidSubtype;
 549                        HvCallEvent_ackLpEvent(event);
 550                }
 551        }
 552}
 553
 554static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 555                             void *arg)
 556{
 557        return -EINVAL;
 558}
 559
 560static struct cdrom_device_ops viocd_dops = {
 561        .open = viocd_open,
 562        .release = viocd_release,
 563        .media_changed = viocd_media_changed,
 564        .lock_door = viocd_lock_door,
 565        .generic_packet = viocd_packet,
 566        .audio_ioctl = viocd_audio_ioctl,
 567        .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
 568};
 569
 570static int find_capability(const char *type)
 571{
 572        struct capability_entry *entry;
 573
 574        for(entry = capability_table; entry->type; ++entry)
 575                if(!strncmp(entry->type, type, 4))
 576                        break;
 577        return entry->capability;
 578}
 579
 580static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 581{
 582        struct gendisk *gendisk;
 583        int deviceno;
 584        struct disk_info *d;
 585        struct cdrom_device_info *c;
 586        struct request_queue *q;
 587        struct device_node *node = vdev->dev.archdata.of_node;
 588
 589        deviceno = vdev->unit_address;
 590        if (deviceno > VIOCD_MAX_CD)
 591                return -ENODEV;
 592        if (!node)
 593                return -ENODEV;
 594
 595        if (deviceno >= viocd_numdev)
 596                viocd_numdev = deviceno + 1;
 597
 598        d = &viocd_diskinfo[deviceno];
 599        d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 600        d->type = of_get_property(node, "linux,vio_type", NULL);
 601        d->model = of_get_property(node, "linux,vio_model", NULL);
 602
 603        c = &d->viocd_info;
 604
 605        c->ops = &viocd_dops;
 606        c->speed = 4;
 607        c->capacity = 1;
 608        c->handle = d;
 609        c->mask = ~find_capability(d->type);
 610        sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 611
 612        if (register_cdrom(c) != 0) {
 613                printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 614                                c->name);
 615                goto out;
 616        }
 617        printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 618                        "type %4.4s, model %3.3s\n",
 619                        c->name, d->rsrcname, d->type, d->model);
 620        q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 621        if (q == NULL) {
 622                printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 623                                c->name);
 624                goto out_unregister_cdrom;
 625        }
 626        gendisk = alloc_disk(1);
 627        if (gendisk == NULL) {
 628                printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 629                                c->name);
 630                goto out_cleanup_queue;
 631        }
 632        gendisk->major = VIOCD_MAJOR;
 633        gendisk->first_minor = deviceno;
 634        strncpy(gendisk->disk_name, c->name,
 635                        sizeof(gendisk->disk_name));
 636        blk_queue_max_hw_segments(q, 1);
 637        blk_queue_max_phys_segments(q, 1);
 638        blk_queue_max_sectors(q, 4096 / 512);
 639        gendisk->queue = q;
 640        gendisk->fops = &viocd_fops;
 641        gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 642        set_capacity(gendisk, 0);
 643        gendisk->private_data = d;
 644        d->viocd_disk = gendisk;
 645        d->dev = &vdev->dev;
 646        gendisk->driverfs_dev = d->dev;
 647        add_disk(gendisk);
 648        return 0;
 649
 650out_cleanup_queue:
 651        blk_cleanup_queue(q);
 652out_unregister_cdrom:
 653        unregister_cdrom(c);
 654out:
 655        return -ENODEV;
 656}
 657
 658static int viocd_remove(struct vio_dev *vdev)
 659{
 660        struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 661
 662        unregister_cdrom(&d->viocd_info);
 663        del_gendisk(d->viocd_disk);
 664        blk_cleanup_queue(d->viocd_disk->queue);
 665        put_disk(d->viocd_disk);
 666        return 0;
 667}
 668
 669/**
 670 * viocd_device_table: Used by vio.c to match devices that we
 671 * support.
 672 */
 673static struct vio_device_id viocd_device_table[] __devinitdata = {
 674        { "block", "IBM,iSeries-viocd" },
 675        { "", "" }
 676};
 677MODULE_DEVICE_TABLE(vio, viocd_device_table);
 678
 679static struct vio_driver viocd_driver = {
 680        .id_table = viocd_device_table,
 681        .probe = viocd_probe,
 682        .remove = viocd_remove,
 683        .driver = {
 684                .name = "viocd",
 685                .owner = THIS_MODULE,
 686        }
 687};
 688
 689static int __init viocd_init(void)
 690{
 691        int ret = 0;
 692
 693        if (!firmware_has_feature(FW_FEATURE_ISERIES))
 694                return -ENODEV;
 695
 696        if (viopath_hostLp == HvLpIndexInvalid) {
 697                vio_set_hostlp();
 698                /* If we don't have a host, bail out */
 699                if (viopath_hostLp == HvLpIndexInvalid)
 700                        return -ENODEV;
 701        }
 702
 703        printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 704                        viopath_hostLp);
 705
 706        if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 707                printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 708                                VIOCD_MAJOR, VIOCD_DEVICE);
 709                return -EIO;
 710        }
 711
 712        ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 713                        MAX_CD_REQ + 2);
 714        if (ret) {
 715                printk(VIOCD_KERN_WARNING
 716                                "error opening path to host partition %d\n",
 717                                viopath_hostLp);
 718                goto out_unregister;
 719        }
 720
 721        /* Initialize our request handler */
 722        vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 723
 724        spin_lock_init(&viocd_reqlock);
 725
 726        ret = vio_register_driver(&viocd_driver);
 727        if (ret)
 728                goto out_free_info;
 729
 730        proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 731                    &proc_viocd_operations);
 732        return 0;
 733
 734out_free_info:
 735        vio_clearHandler(viomajorsubtype_cdio);
 736        viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 737out_unregister:
 738        unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 739        return ret;
 740}
 741
 742static void __exit viocd_exit(void)
 743{
 744        remove_proc_entry("iSeries/viocd", NULL);
 745        vio_unregister_driver(&viocd_driver);
 746        viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 747        vio_clearHandler(viomajorsubtype_cdio);
 748        unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 749}
 750
 751module_init(viocd_init);
 752module_exit(viocd_exit);
 753MODULE_LICENSE("GPL");
 754