drivers/misc/hpilo.c

   1 /*
   2  * Driver for HP iLO/iLO2 management processor.
   3  *
   4  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   5  *      David Altobelli <david.altobelli@hp.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/fs.h>
  15 #include <linux/pci.h>
  16 #include <linux/ioport.h>
  17 #include <linux/device.h>
  18 #include <linux/file.h>
  19 #include <linux/cdev.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/delay.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/io.h>
  24 #include "hpilo.h"
  25
  26 static struct class *ilo_class;
  27 static unsigned int ilo_major;
  28 static char ilo_hwdev[MAX_ILO_DEV];
  29
  30 static inline int get_entry_id(int entry)
  31 {
  32         return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
  33 }
  34
  35 static inline int get_entry_len(int entry)
  36 {
  37         return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
  38 }
  39
  40 static inline int mk_entry(int id, int len)
  41 {
  42         int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
  43         return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
  44 }
  45
  46 static inline int desc_mem_sz(int nr_entry)
  47 {
  48         return nr_entry << L2_QENTRY_SZ;
  49 }
  50
  51 /*
  52  * FIFO queues, shared with hardware.
  53  *
  54  * If a queue has empty slots, an entry is added to the queue tail,
  55  * and that entry is marked as occupied.
  56  * Entries can be dequeued from the head of the list, when the device
  57  * has marked the entry as consumed.
  58  *
  59  * Returns true on successful queue/dequeue, false on failure.
  60  */
  61 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
  62 {
  63         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  64         int ret = 0;
  65
  66         spin_lock(&hw->fifo_lock);
  67         if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
  68               & ENTRY_MASK_O)) {
  69                 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
  70                                 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
  71                 fifo_q->tail += 1;
  72                 ret = 1;
  73         }
  74         spin_unlock(&hw->fifo_lock);
  75
  76         return ret;
  77 }
  78
  79 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
  80 {
  81         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  82         int ret = 0;
  83         u64 c;
  84
  85         spin_lock(&hw->fifo_lock);
  86         c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
  87         if (c & ENTRY_MASK_C) {
  88                 if (entry)
  89                         *entry = c & ENTRY_MASK_NOSTATE;
  90
  91                 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
  92                                                         (c | ENTRY_MASK) + 1;
  93                 fifo_q->head += 1;
  94                 ret = 1;
  95         }
  96         spin_unlock(&hw->fifo_lock);
  97
  98         return ret;
  99 }
 100
 101 static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
 102                            int dir, int id, int len)
 103 {
 104         char *fifobar;
 105         int entry;
 106
 107         if (dir == SENDQ)
 108                 fifobar = ccb->ccb_u1.send_fifobar;
 109         else
 110                 fifobar = ccb->ccb_u3.recv_fifobar;
 111
 112         entry = mk_entry(id, len);
 113         return fifo_enqueue(hw, fifobar, entry);
 114 }
 115
 116 static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
 117                            int dir, int *id, int *len, void **pkt)
 118 {
 119         char *fifobar, *desc;
 120         int entry = 0, pkt_id = 0;
 121         int ret;
 122
 123         if (dir == SENDQ) {
 124                 fifobar = ccb->ccb_u1.send_fifobar;
 125                 desc = ccb->ccb_u2.send_desc;
 126         } else {
 127                 fifobar = ccb->ccb_u3.recv_fifobar;
 128                 desc = ccb->ccb_u4.recv_desc;
 129         }
 130
 131         ret = fifo_dequeue(hw, fifobar, &entry);
 132         if (ret) {
 133                 pkt_id = get_entry_id(entry);
 134                 if (id)
 135                         *id = pkt_id;
 136                 if (len)
 137                         *len = get_entry_len(entry);
 138                 if (pkt)
 139                         *pkt = (void *)(desc + desc_mem_sz(pkt_id));
 140         }
 141
 142         return ret;
 143 }
 144
 145 static inline void doorbell_set(struct ccb *ccb)
 146 {
 147         iowrite8(1, ccb->ccb_u5.db_base);
 148 }
 149
 150 static inline void doorbell_clr(struct ccb *ccb)
 151 {
 152         iowrite8(2, ccb->ccb_u5.db_base);
 153 }
 154 static inline int ctrl_set(int l2sz, int idxmask, int desclim)
 155 {
 156         int active = 0, go = 1;
 157         return l2sz << CTRL_BITPOS_L2SZ |
 158                idxmask << CTRL_BITPOS_FIFOINDEXMASK |
 159                desclim << CTRL_BITPOS_DESCLIMIT |
 160                active << CTRL_BITPOS_A |
 161                go << CTRL_BITPOS_G;
 162 }
 163 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
 164 {
 165         /* for simplicity, use the same parameters for send and recv ctrls */
 166         ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 167         ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 168 }
 169
 170 static inline int fifo_sz(int nr_entry)
 171 {
 172         /* size of a fifo is determined by the number of entries it contains */
 173         return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
 174 }
 175
 176 static void fifo_setup(void *base_addr, int nr_entry)
 177 {
 178         struct fifo *fifo_q = base_addr;
 179         int i;
 180
 181         /* set up an empty fifo */
 182         fifo_q->head = 0;
 183         fifo_q->tail = 0;
 184         fifo_q->reset = 0;
 185         fifo_q->nrents = nr_entry;
 186         fifo_q->imask = nr_entry - 1;
 187         fifo_q->merge = ENTRY_MASK_O;
 188
 189         for (i = 0; i < nr_entry; i++)
 190                 fifo_q->fifobar[i] = 0;
 191 }
 192
 193 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
 194 {
 195         struct ccb *driver_ccb;
 196         struct ccb __iomem *device_ccb;
 197         int retries;
 198
 199         driver_ccb = &data->driver_ccb;
 200         device_ccb = data->mapped_ccb;
 201
 202         /* complicated dance to tell the hw we are stopping */
 203         doorbell_clr(driver_ccb);
 204         iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
 205                   &device_ccb->send_ctrl);
 206         iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
 207                   &device_ccb->recv_ctrl);
 208
 209         /* give iLO some time to process stop request */
 210         for (retries = 1000; retries > 0; retries--) {
 211                 doorbell_set(driver_ccb);
 212                 udelay(1);
 213                 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
 214                     &&
 215                     !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
 216                         break;
 217         }
 218         if (retries == 0)
 219                 dev_err(&pdev->dev, "Closing, but controller still active\n");
 220
 221         /* clear the hw ccb */
 222         memset_io(device_ccb, 0, sizeof(struct ccb));
 223
 224         /* free resources used to back send/recv queues */
 225         pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
 226 }
 227
 228 static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 229 {
 230         char *dma_va, *dma_pa;
 231         int pkt_id, pkt_sz, i, error;
 232         struct ccb *driver_ccb, *ilo_ccb;
 233         struct pci_dev *pdev;
 234
 235         driver_ccb = &data->driver_ccb;
 236         ilo_ccb = &data->ilo_ccb;
 237         pdev = hw->ilo_dev;
 238
 239         data->dma_size = 2 * fifo_sz(NR_QENTRY) +
 240                          2 * desc_mem_sz(NR_QENTRY) +
 241                          ILO_START_ALIGN + ILO_CACHE_SZ;
 242
 243         error = -ENOMEM;
 244         data->dma_va = pci_alloc_consistent(pdev, data->dma_size,
 245                                             &data->dma_pa);
 246         if (!data->dma_va)
 247                 goto out;
 248
 249         dma_va = (char *)data->dma_va;
 250         dma_pa = (char *)data->dma_pa;
 251
 252         memset(dma_va, 0, data->dma_size);
 253
 254         dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
 255         dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN);
 256
 257         /*
 258          * Create two ccb's, one with virt addrs, one with phys addrs.
 259          * Copy the phys addr ccb to device shared mem.
 260          */
 261         ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
 262         ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
 263
 264         fifo_setup(dma_va, NR_QENTRY);
 265         driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
 266         ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE;
 267         dma_va += fifo_sz(NR_QENTRY);
 268         dma_pa += fifo_sz(NR_QENTRY);
 269
 270         dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
 271         dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ);
 272
 273         fifo_setup(dma_va, NR_QENTRY);
 274         driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
 275         ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE;
 276         dma_va += fifo_sz(NR_QENTRY);
 277         dma_pa += fifo_sz(NR_QENTRY);
 278
 279         driver_ccb->ccb_u2.send_desc = dma_va;
 280         ilo_ccb->ccb_u2.send_desc = dma_pa;
 281         dma_pa += desc_mem_sz(NR_QENTRY);
 282         dma_va += desc_mem_sz(NR_QENTRY);
 283
 284         driver_ccb->ccb_u4.recv_desc = dma_va;
 285         ilo_ccb->ccb_u4.recv_desc = dma_pa;
 286
 287         driver_ccb->channel = slot;
 288         ilo_ccb->channel = slot;
 289
 290         driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
 291         ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
 292
 293         /* copy the ccb with physical addrs to device memory */
 294         data->mapped_ccb = (struct ccb __iomem *)
 295                                 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
 296         memcpy_toio(data->mapped_ccb, ilo_ccb, sizeof(struct ccb));
 297
 298         /* put packets on the send and receive queues */
 299         pkt_sz = 0;
 300         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
 301                 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
 302                 doorbell_set(driver_ccb);
 303         }
 304
 305         pkt_sz = desc_mem_sz(1);
 306         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
 307                 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
 308
 309         doorbell_clr(driver_ccb);
 310
 311         /* make sure iLO is really handling requests */
 312         for (i = 1000; i > 0; i--) {
 313                 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
 314                         break;
 315                 udelay(1);
 316         }
 317
 318         if (i) {
 319                 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
 320                 doorbell_set(driver_ccb);
 321         } else {
 322                 dev_err(&pdev->dev, "Open could not dequeue a packet\n");
 323                 error = -EBUSY;
 324                 goto free;
 325         }
 326
 327         return 0;
 328 free:
 329         pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
 330 out:
 331         return error;
 332 }
 333
 334 static inline int is_channel_reset(struct ccb *ccb)
 335 {
 336         /* check for this particular channel needing a reset */
 337         return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
 338 }
 339
 340 static inline void set_channel_reset(struct ccb *ccb)
 341 {
 342         /* set a flag indicating this channel needs a reset */
 343         FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
 344 }
 345
 346 static inline int is_device_reset(struct ilo_hwinfo *hw)
 347 {
 348         /* check for global reset condition */
 349         return ioread32(&hw->mmio_vaddr[DB_OUT]) & (1 << DB_RESET);
 350 }
 351
 352 static inline void clear_device(struct ilo_hwinfo *hw)
 353 {
 354         /* clear the device (reset bits, pending channel entries) */
 355         iowrite32(-1, &hw->mmio_vaddr[DB_OUT]);
 356 }
 357
 358 static void ilo_locked_reset(struct ilo_hwinfo *hw)
 359 {
 360         int slot;
 361
 362         /*
 363          * Mapped memory is zeroed on ilo reset, so set a per ccb flag
 364          * to indicate that this ccb needs to be closed and reopened.
 365          */
 366         for (slot = 0; slot < MAX_CCB; slot++) {
 367                 if (!hw->ccb_alloc[slot])
 368                         continue;
 369                 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
 370         }
 371
 372         clear_device(hw);
 373 }
 374
 375 static void ilo_reset(struct ilo_hwinfo *hw)
 376 {
 377         spin_lock(&hw->alloc_lock);
 378
 379         /* reset might have been handled after lock was taken */
 380         if (is_device_reset(hw))
 381                 ilo_locked_reset(hw);
 382
 383         spin_unlock(&hw->alloc_lock);
 384 }
 385
 386 static ssize_t ilo_read(struct file *fp, char __user *buf,
 387                         size_t len, loff_t *off)
 388 {
 389         int err, found, cnt, pkt_id, pkt_len;
 390         struct ccb_data *data;
 391         struct ccb *driver_ccb;
 392         struct ilo_hwinfo *hw;
 393         void *pkt;
 394
 395         data = fp->private_data;
 396         driver_ccb = &data->driver_ccb;
 397         hw = data->ilo_hw;
 398
 399         if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
 400                 /*
 401                  * If the device has been reset, applications
 402                  * need to close and reopen all ccbs.
 403                  */
 404                 ilo_reset(hw);
 405                 return -ENODEV;
 406         }
 407
 408         /*
 409          * This function is to be called when data is expected
 410          * in the channel, and will return an error if no packet is found
 411          * during the loop below.  The sleep/retry logic is to allow
 412          * applications to call read() immediately post write(),
 413          * and give iLO some time to process the sent packet.
 414          */
 415         cnt = 20;
 416         do {
 417                 /* look for a received packet */
 418                 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
 419                                         &pkt_len, &pkt);
 420                 if (found)
 421                         break;
 422                 cnt--;
 423                 msleep(100);
 424         } while (!found && cnt);
 425
 426         if (!found)
 427                 return -EAGAIN;
 428
 429         /* only copy the length of the received packet */
 430         if (pkt_len < len)
 431                 len = pkt_len;
 432
 433         err = copy_to_user(buf, pkt, len);
 434
 435         /* return the received packet to the queue */
 436         ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
 437
 438         return err ? -EFAULT : len;
 439 }
 440
 441 static ssize_t ilo_write(struct file *fp, const char __user *buf,
 442                          size_t len, loff_t *off)
 443 {
 444         int err, pkt_id, pkt_len;
 445         struct ccb_data *data;
 446         struct ccb *driver_ccb;
 447         struct ilo_hwinfo *hw;
 448         void *pkt;
 449
 450         data = fp->private_data;
 451         driver_ccb = &data->driver_ccb;
 452         hw = data->ilo_hw;
 453
 454         if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
 455                 /*
 456                  * If the device has been reset, applications
 457                  * need to close and reopen all ccbs.
 458                  */
 459                 ilo_reset(hw);
 460                 return -ENODEV;
 461         }
 462
 463         /* get a packet to send the user command */
 464         if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
 465                 return -EBUSY;
 466
 467         /* limit the length to the length of the packet */
 468         if (pkt_len < len)
 469                 len = pkt_len;
 470
 471         /* on failure, set the len to 0 to return empty packet to the device */
 472         err = copy_from_user(pkt, buf, len);
 473         if (err)
 474                 len = 0;
 475
 476         /* send the packet */
 477         ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
 478         doorbell_set(driver_ccb);
 479
 480         return err ? -EFAULT : len;
 481 }
 482
 483 static int ilo_close(struct inode *ip, struct file *fp)
 484 {
 485         int slot;
 486         struct ccb_data *data;
 487         struct ilo_hwinfo *hw;
 488
 489         slot = iminor(ip) % MAX_CCB;
 490         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 491
 492         spin_lock(&hw->alloc_lock);
 493
 494         if (is_device_reset(hw))
 495                 ilo_locked_reset(hw);
 496
 497         if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
 498
 499                 data = fp->private_data;
 500
 501                 ilo_ccb_close(hw->ilo_dev, data);
 502
 503                 kfree(data);
 504                 hw->ccb_alloc[slot] = NULL;
 505         } else
 506                 hw->ccb_alloc[slot]->ccb_cnt--;
 507
 508         spin_unlock(&hw->alloc_lock);
 509
 510         return 0;
 511 }
 512
 513 static int ilo_open(struct inode *ip, struct file *fp)
 514 {
 515         int slot, error;
 516         struct ccb_data *data;
 517         struct ilo_hwinfo *hw;
 518
 519         slot = iminor(ip) % MAX_CCB;
 520         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 521
 522         /* new ccb allocation */
 523         data = kzalloc(sizeof(*data), GFP_KERNEL);
 524         if (!data)
 525                 return -ENOMEM;
 526
 527         spin_lock(&hw->alloc_lock);
 528
 529         if (is_device_reset(hw))
 530                 ilo_locked_reset(hw);
 531
 532         /* each fd private_data holds sw/hw view of ccb */
 533         if (hw->ccb_alloc[slot] == NULL) {
 534                 /* create a channel control block for this minor */
 535                 error = ilo_ccb_open(hw, data, slot);
 536                 if (!error) {
 537                         hw->ccb_alloc[slot] = data;
 538                         hw->ccb_alloc[slot]->ccb_cnt = 1;
 539                         hw->ccb_alloc[slot]->ccb_excl = fp->f_flags & O_EXCL;
 540                         hw->ccb_alloc[slot]->ilo_hw = hw;
 541                 } else
 542                         kfree(data);
 543         } else {
 544                 kfree(data);
 545                 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
 546                         /*
 547                          * The channel exists, and either this open
 548                          * or a previous open of this channel wants
 549                          * exclusive access.
 550                          */
 551                         error = -EBUSY;
 552                 } else {
 553                         hw->ccb_alloc[slot]->ccb_cnt++;
 554                         error = 0;
 555                 }
 556         }
 557         spin_unlock(&hw->alloc_lock);
 558
 559         if (!error)
 560                 fp->private_data = hw->ccb_alloc[slot];
 561
 562         return error;
 563 }
 564
 565 static const struct file_operations ilo_fops = {
 566         .owner          = THIS_MODULE,
 567         .read           = ilo_read,
 568         .write          = ilo_write,
 569         .open           = ilo_open,
 570         .release        = ilo_close,
 571 };
 572
 573 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 574 {
 575         pci_iounmap(pdev, hw->db_vaddr);
 576         pci_iounmap(pdev, hw->ram_vaddr);
 577         pci_iounmap(pdev, hw->mmio_vaddr);
 578 }
 579
 580 static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 581 {
 582         int error = -ENOMEM;
 583
 584         /* map the memory mapped i/o registers */
 585         hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
 586         if (hw->mmio_vaddr == NULL) {
 587                 dev_err(&pdev->dev, "Error mapping mmio\n");
 588                 goto out;
 589         }
 590
 591         /* map the adapter shared memory region */
 592         hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
 593         if (hw->ram_vaddr == NULL) {
 594                 dev_err(&pdev->dev, "Error mapping shared mem\n");
 595                 goto mmio_free;
 596         }
 597
 598         /* map the doorbell aperture */
 599         hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
 600         if (hw->db_vaddr == NULL) {
 601                 dev_err(&pdev->dev, "Error mapping doorbell\n");
 602                 goto ram_free;
 603         }
 604
 605         return 0;
 606 ram_free:
 607         pci_iounmap(pdev, hw->ram_vaddr);
 608 mmio_free:
 609         pci_iounmap(pdev, hw->mmio_vaddr);
 610 out:
 611         return error;
 612 }
 613
 614 static void ilo_remove(struct pci_dev *pdev)
 615 {
 616         int i, minor;
 617         struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
 618
 619         clear_device(ilo_hw);
 620
 621         minor = MINOR(ilo_hw->cdev.dev);
 622         for (i = minor; i < minor + MAX_CCB; i++)
 623                 device_destroy(ilo_class, MKDEV(ilo_major, i));
 624
 625         cdev_del(&ilo_hw->cdev);
 626         ilo_unmap_device(pdev, ilo_hw);
 627         pci_release_regions(pdev);
 628         pci_disable_device(pdev);
 629         kfree(ilo_hw);
 630         ilo_hwdev[(minor / MAX_CCB)] = 0;
 631 }
 632
 633 static int __devinit ilo_probe(struct pci_dev *pdev,
 634                                const struct pci_device_id *ent)
 635 {
 636         int devnum, minor, start, error;
 637         struct ilo_hwinfo *ilo_hw;
 638
 639         /* find a free range for device files */
 640         for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
 641                 if (ilo_hwdev[devnum] == 0) {
 642                         ilo_hwdev[devnum] = 1;
 643                         break;
 644                 }
 645         }
 646
 647         if (devnum == MAX_ILO_DEV) {
 648                 dev_err(&pdev->dev, "Error finding free device\n");
 649                 return -ENODEV;
 650         }
 651
 652         /* track global allocations for this device */
 653         error = -ENOMEM;
 654         ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
 655         if (!ilo_hw)
 656                 goto out;
 657
 658         ilo_hw->ilo_dev = pdev;
 659         spin_lock_init(&ilo_hw->alloc_lock);
 660         spin_lock_init(&ilo_hw->fifo_lock);
 661
 662         error = pci_enable_device(pdev);
 663         if (error)
 664                 goto free;
 665
 666         pci_set_master(pdev);
 667
 668         error = pci_request_regions(pdev, ILO_NAME);
 669         if (error)
 670                 goto disable;
 671
 672         error = ilo_map_device(pdev, ilo_hw);
 673         if (error)
 674                 goto free_regions;
 675
 676         pci_set_drvdata(pdev, ilo_hw);
 677         clear_device(ilo_hw);
 678
 679         cdev_init(&ilo_hw->cdev, &ilo_fops);
 680         ilo_hw->cdev.owner = THIS_MODULE;
 681         start = devnum * MAX_CCB;
 682         error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
 683         if (error) {
 684                 dev_err(&pdev->dev, "Could not add cdev\n");
 685                 goto unmap;
 686         }
 687
 688         for (minor = 0 ; minor < MAX_CCB; minor++) {
 689                 struct device *dev;
 690                 dev = device_create(ilo_class, &pdev->dev,
 691                                     MKDEV(ilo_major, minor), NULL,
 692                                     "hpilo!d%dccb%d", devnum, minor);
 693                 if (IS_ERR(dev))
 694                         dev_err(&pdev->dev, "Could not create files\n");
 695         }
 696
 697         return 0;
 698 unmap:
 699         ilo_unmap_device(pdev, ilo_hw);
 700 free_regions:
 701         pci_release_regions(pdev);
 702 disable:
 703         pci_disable_device(pdev);
 704 free:
 705         kfree(ilo_hw);
 706 out:
 707         ilo_hwdev[devnum] = 0;
 708         return error;
 709 }
 710
 711 static struct pci_device_id ilo_devices[] = {
 712         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
 713         { }
 714 };
 715 MODULE_DEVICE_TABLE(pci, ilo_devices);
 716
 717 static struct pci_driver ilo_driver = {
 718         .name     = ILO_NAME,
 719         .id_table = ilo_devices,
 720         .probe    = ilo_probe,
 721         .remove   = __devexit_p(ilo_remove),
 722 };
 723
 724 static int __init ilo_init(void)
 725 {
 726         int error;
 727         dev_t dev;
 728
 729         ilo_class = class_create(THIS_MODULE, "iLO");
 730         if (IS_ERR(ilo_class)) {
 731                 error = PTR_ERR(ilo_class);
 732                 goto out;
 733         }
 734
 735         error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
 736         if (error)
 737                 goto class_destroy;
 738
 739         ilo_major = MAJOR(dev);
 740
 741         error = pci_register_driver(&ilo_driver);
 742         if (error)
 743                 goto chr_remove;
 744
 745         return 0;
 746 chr_remove:
 747         unregister_chrdev_region(dev, MAX_OPEN);
 748 class_destroy:
 749         class_destroy(ilo_class);
 750 out:
 751         return error;
 752 }
 753
 754 static void __exit ilo_exit(void)
 755 {
 756         pci_unregister_driver(&ilo_driver);
 757         unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
 758         class_destroy(ilo_class);
 759 }
 760
 761 MODULE_VERSION("0.05");
 762 MODULE_ALIAS(ILO_NAME);
 763 MODULE_DESCRIPTION(ILO_NAME);
 764 MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
 765 MODULE_LICENSE("GPL v2");
 766
 767 module_init(ilo_init);
 768 module_exit(ilo_exit);