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/interrupt.h>
  17 #include <linux/ioport.h>
  18 #include <linux/device.h>
  19 #include <linux/file.h>
  20 #include <linux/cdev.h>
  21 #include <linux/sched.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/delay.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/io.h>
  26 #include <linux/wait.h>
  27 #include <linux/poll.h>
  28 #include "hpilo.h"
  29
  30 static struct class *ilo_class;
  31 static unsigned int ilo_major;
  32 static char ilo_hwdev[MAX_ILO_DEV];
  33
  34 static inline int get_entry_id(int entry)
  35 {
  36         return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
  37 }
  38
  39 static inline int get_entry_len(int entry)
  40 {
  41         return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
  42 }
  43
  44 static inline int mk_entry(int id, int len)
  45 {
  46         int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
  47         return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
  48 }
  49
  50 static inline int desc_mem_sz(int nr_entry)
  51 {
  52         return nr_entry << L2_QENTRY_SZ;
  53 }
  54
  55 /*
  56  * FIFO queues, shared with hardware.
  57  *
  58  * If a queue has empty slots, an entry is added to the queue tail,
  59  * and that entry is marked as occupied.
  60  * Entries can be dequeued from the head of the list, when the device
  61  * has marked the entry as consumed.
  62  *
  63  * Returns true on successful queue/dequeue, false on failure.
  64  */
  65 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
  66 {
  67         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  68         unsigned long flags;
  69         int ret = 0;
  70
  71         spin_lock_irqsave(&hw->fifo_lock, flags);
  72         if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
  73               & ENTRY_MASK_O)) {
  74                 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
  75                                 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
  76                 fifo_q->tail += 1;
  77                 ret = 1;
  78         }
  79         spin_unlock_irqrestore(&hw->fifo_lock, flags);
  80
  81         return ret;
  82 }
  83
  84 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
  85 {
  86         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  87         unsigned long flags;
  88         int ret = 0;
  89         u64 c;
  90
  91         spin_lock_irqsave(&hw->fifo_lock, flags);
  92         c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
  93         if (c & ENTRY_MASK_C) {
  94                 if (entry)
  95                         *entry = c & ENTRY_MASK_NOSTATE;
  96
  97                 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
  98                                                         (c | ENTRY_MASK) + 1;
  99                 fifo_q->head += 1;
 100                 ret = 1;
 101         }
 102         spin_unlock_irqrestore(&hw->fifo_lock, flags);
 103
 104         return ret;
 105 }
 106
 107 static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
 108 {
 109         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
 110         unsigned long flags;
 111         int ret = 0;
 112         u64 c;
 113
 114         spin_lock_irqsave(&hw->fifo_lock, flags);
 115         c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
 116         if (c & ENTRY_MASK_C)
 117                 ret = 1;
 118         spin_unlock_irqrestore(&hw->fifo_lock, flags);
 119
 120         return ret;
 121 }
 122
 123 static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
 124                            int dir, int id, int len)
 125 {
 126         char *fifobar;
 127         int entry;
 128
 129         if (dir == SENDQ)
 130                 fifobar = ccb->ccb_u1.send_fifobar;
 131         else
 132                 fifobar = ccb->ccb_u3.recv_fifobar;
 133
 134         entry = mk_entry(id, len);
 135         return fifo_enqueue(hw, fifobar, entry);
 136 }
 137
 138 static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
 139                            int dir, int *id, int *len, void **pkt)
 140 {
 141         char *fifobar, *desc;
 142         int entry = 0, pkt_id = 0;
 143         int ret;
 144
 145         if (dir == SENDQ) {
 146                 fifobar = ccb->ccb_u1.send_fifobar;
 147                 desc = ccb->ccb_u2.send_desc;
 148         } else {
 149                 fifobar = ccb->ccb_u3.recv_fifobar;
 150                 desc = ccb->ccb_u4.recv_desc;
 151         }
 152
 153         ret = fifo_dequeue(hw, fifobar, &entry);
 154         if (ret) {
 155                 pkt_id = get_entry_id(entry);
 156                 if (id)
 157                         *id = pkt_id;
 158                 if (len)
 159                         *len = get_entry_len(entry);
 160                 if (pkt)
 161                         *pkt = (void *)(desc + desc_mem_sz(pkt_id));
 162         }
 163
 164         return ret;
 165 }
 166
 167 static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
 168 {
 169         char *fifobar = ccb->ccb_u3.recv_fifobar;
 170
 171         return fifo_check_recv(hw, fifobar);
 172 }
 173
 174 static inline void doorbell_set(struct ccb *ccb)
 175 {
 176         iowrite8(1, ccb->ccb_u5.db_base);
 177 }
 178
 179 static inline void doorbell_clr(struct ccb *ccb)
 180 {
 181         iowrite8(2, ccb->ccb_u5.db_base);
 182 }
 183
 184 static inline int ctrl_set(int l2sz, int idxmask, int desclim)
 185 {
 186         int active = 0, go = 1;
 187         return l2sz << CTRL_BITPOS_L2SZ |
 188                idxmask << CTRL_BITPOS_FIFOINDEXMASK |
 189                desclim << CTRL_BITPOS_DESCLIMIT |
 190                active << CTRL_BITPOS_A |
 191                go << CTRL_BITPOS_G;
 192 }
 193
 194 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
 195 {
 196         /* for simplicity, use the same parameters for send and recv ctrls */
 197         ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 198         ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 199 }
 200
 201 static inline int fifo_sz(int nr_entry)
 202 {
 203         /* size of a fifo is determined by the number of entries it contains */
 204         return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
 205 }
 206
 207 static void fifo_setup(void *base_addr, int nr_entry)
 208 {
 209         struct fifo *fifo_q = base_addr;
 210         int i;
 211
 212         /* set up an empty fifo */
 213         fifo_q->head = 0;
 214         fifo_q->tail = 0;
 215         fifo_q->reset = 0;
 216         fifo_q->nrents = nr_entry;
 217         fifo_q->imask = nr_entry - 1;
 218         fifo_q->merge = ENTRY_MASK_O;
 219
 220         for (i = 0; i < nr_entry; i++)
 221                 fifo_q->fifobar[i] = 0;
 222 }
 223
 224 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
 225 {
 226         struct ccb *driver_ccb = &data->driver_ccb;
 227         struct ccb __iomem *device_ccb = data->mapped_ccb;
 228         int retries;
 229
 230         /* complicated dance to tell the hw we are stopping */
 231         doorbell_clr(driver_ccb);
 232         iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
 233                   &device_ccb->send_ctrl);
 234         iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
 235                   &device_ccb->recv_ctrl);
 236
 237         /* give iLO some time to process stop request */
 238         for (retries = MAX_WAIT; retries > 0; retries--) {
 239                 doorbell_set(driver_ccb);
 240                 udelay(WAIT_TIME);
 241                 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
 242                     &&
 243                     !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
 244                         break;
 245         }
 246         if (retries == 0)
 247                 dev_err(&pdev->dev, "Closing, but controller still active\n");
 248
 249         /* clear the hw ccb */
 250         memset_io(device_ccb, 0, sizeof(struct ccb));
 251
 252         /* free resources used to back send/recv queues */
 253         pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
 254 }
 255
 256 static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 257 {
 258         char *dma_va, *dma_pa;
 259         struct ccb *driver_ccb, *ilo_ccb;
 260
 261         driver_ccb = &data->driver_ccb;
 262         ilo_ccb = &data->ilo_ccb;
 263
 264         data->dma_size = 2 * fifo_sz(NR_QENTRY) +
 265                          2 * desc_mem_sz(NR_QENTRY) +
 266                          ILO_START_ALIGN + ILO_CACHE_SZ;
 267
 268         data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
 269                                             &data->dma_pa);
 270         if (!data->dma_va)
 271                 return -ENOMEM;
 272
 273         dma_va = (char *)data->dma_va;
 274         dma_pa = (char *)data->dma_pa;
 275
 276         memset(dma_va, 0, data->dma_size);
 277
 278         dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
 279         dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN);
 280
 281         /*
 282          * Create two ccb's, one with virt addrs, one with phys addrs.
 283          * Copy the phys addr ccb to device shared mem.
 284          */
 285         ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
 286         ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
 287
 288         fifo_setup(dma_va, NR_QENTRY);
 289         driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
 290         ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE;
 291         dma_va += fifo_sz(NR_QENTRY);
 292         dma_pa += fifo_sz(NR_QENTRY);
 293
 294         dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
 295         dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ);
 296
 297         fifo_setup(dma_va, NR_QENTRY);
 298         driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
 299         ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE;
 300         dma_va += fifo_sz(NR_QENTRY);
 301         dma_pa += fifo_sz(NR_QENTRY);
 302
 303         driver_ccb->ccb_u2.send_desc = dma_va;
 304         ilo_ccb->ccb_u2.send_desc = dma_pa;
 305         dma_pa += desc_mem_sz(NR_QENTRY);
 306         dma_va += desc_mem_sz(NR_QENTRY);
 307
 308         driver_ccb->ccb_u4.recv_desc = dma_va;
 309         ilo_ccb->ccb_u4.recv_desc = dma_pa;
 310
 311         driver_ccb->channel = slot;
 312         ilo_ccb->channel = slot;
 313
 314         driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
 315         ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
 316
 317         return 0;
 318 }
 319
 320 static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 321 {
 322         int pkt_id, pkt_sz;
 323         struct ccb *driver_ccb = &data->driver_ccb;
 324
 325         /* copy the ccb with physical addrs to device memory */
 326         data->mapped_ccb = (struct ccb __iomem *)
 327                                 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
 328         memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
 329
 330         /* put packets on the send and receive queues */
 331         pkt_sz = 0;
 332         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
 333                 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
 334                 doorbell_set(driver_ccb);
 335         }
 336
 337         pkt_sz = desc_mem_sz(1);
 338         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
 339                 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
 340
 341         /* the ccb is ready to use */
 342         doorbell_clr(driver_ccb);
 343 }
 344
 345 static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
 346 {
 347         int pkt_id, i;
 348         struct ccb *driver_ccb = &data->driver_ccb;
 349
 350         /* make sure iLO is really handling requests */
 351         for (i = MAX_WAIT; i > 0; i--) {
 352                 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
 353                         break;
 354                 udelay(WAIT_TIME);
 355         }
 356
 357         if (i == 0) {
 358                 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
 359                 return -EBUSY;
 360         }
 361
 362         ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
 363         doorbell_set(driver_ccb);
 364         return 0;
 365 }
 366
 367 static inline int is_channel_reset(struct ccb *ccb)
 368 {
 369         /* check for this particular channel needing a reset */
 370         return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
 371 }
 372
 373 static inline void set_channel_reset(struct ccb *ccb)
 374 {
 375         /* set a flag indicating this channel needs a reset */
 376         FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
 377 }
 378
 379 static inline int get_device_outbound(struct ilo_hwinfo *hw)
 380 {
 381         return ioread32(&hw->mmio_vaddr[DB_OUT]);
 382 }
 383
 384 static inline int is_db_reset(int db_out)
 385 {
 386         return db_out & (1 << DB_RESET);
 387 }
 388
 389 static inline int is_device_reset(struct ilo_hwinfo *hw)
 390 {
 391         /* check for global reset condition */
 392         return is_db_reset(get_device_outbound(hw));
 393 }
 394
 395 static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
 396 {
 397         iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
 398 }
 399
 400 static inline void clear_device(struct ilo_hwinfo *hw)
 401 {
 402         /* clear the device (reset bits, pending channel entries) */
 403         clear_pending_db(hw, -1);
 404 }
 405
 406 static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
 407 {
 408         iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
 409 }
 410
 411 static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
 412 {
 413         iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
 414                  &hw->mmio_vaddr[DB_IRQ]);
 415 }
 416
 417 static void ilo_set_reset(struct ilo_hwinfo *hw)
 418 {
 419         int slot;
 420
 421         /*
 422          * Mapped memory is zeroed on ilo reset, so set a per ccb flag
 423          * to indicate that this ccb needs to be closed and reopened.
 424          */
 425         for (slot = 0; slot < MAX_CCB; slot++) {
 426                 if (!hw->ccb_alloc[slot])
 427                         continue;
 428                 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
 429         }
 430 }
 431
 432 static ssize_t ilo_read(struct file *fp, char __user *buf,
 433                         size_t len, loff_t *off)
 434 {
 435         int err, found, cnt, pkt_id, pkt_len;
 436         struct ccb_data *data = fp->private_data;
 437         struct ccb *driver_ccb = &data->driver_ccb;
 438         struct ilo_hwinfo *hw = data->ilo_hw;
 439         void *pkt;
 440
 441         if (is_channel_reset(driver_ccb)) {
 442                 /*
 443                  * If the device has been reset, applications
 444                  * need to close and reopen all ccbs.
 445                  */
 446                 return -ENODEV;
 447         }
 448
 449         /*
 450          * This function is to be called when data is expected
 451          * in the channel, and will return an error if no packet is found
 452          * during the loop below.  The sleep/retry logic is to allow
 453          * applications to call read() immediately post write(),
 454          * and give iLO some time to process the sent packet.
 455          */
 456         cnt = 20;
 457         do {
 458                 /* look for a received packet */
 459                 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
 460                                         &pkt_len, &pkt);
 461                 if (found)
 462                         break;
 463                 cnt--;
 464                 msleep(100);
 465         } while (!found && cnt);
 466
 467         if (!found)
 468                 return -EAGAIN;
 469
 470         /* only copy the length of the received packet */
 471         if (pkt_len < len)
 472                 len = pkt_len;
 473
 474         err = copy_to_user(buf, pkt, len);
 475
 476         /* return the received packet to the queue */
 477         ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
 478
 479         return err ? -EFAULT : len;
 480 }
 481
 482 static ssize_t ilo_write(struct file *fp, const char __user *buf,
 483                          size_t len, loff_t *off)
 484 {
 485         int err, pkt_id, pkt_len;
 486         struct ccb_data *data = fp->private_data;
 487         struct ccb *driver_ccb = &data->driver_ccb;
 488         struct ilo_hwinfo *hw = data->ilo_hw;
 489         void *pkt;
 490
 491         if (is_channel_reset(driver_ccb))
 492                 return -ENODEV;
 493
 494         /* get a packet to send the user command */
 495         if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
 496                 return -EBUSY;
 497
 498         /* limit the length to the length of the packet */
 499         if (pkt_len < len)
 500                 len = pkt_len;
 501
 502         /* on failure, set the len to 0 to return empty packet to the device */
 503         err = copy_from_user(pkt, buf, len);
 504         if (err)
 505                 len = 0;
 506
 507         /* send the packet */
 508         ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
 509         doorbell_set(driver_ccb);
 510
 511         return err ? -EFAULT : len;
 512 }
 513
 514 static unsigned int ilo_poll(struct file *fp, poll_table *wait)
 515 {
 516         struct ccb_data *data = fp->private_data;
 517         struct ccb *driver_ccb = &data->driver_ccb;
 518
 519         poll_wait(fp, &data->ccb_waitq, wait);
 520
 521         if (is_channel_reset(driver_ccb))
 522                 return POLLERR;
 523         else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
 524                 return POLLIN | POLLRDNORM;
 525
 526         return 0;
 527 }
 528
 529 static int ilo_close(struct inode *ip, struct file *fp)
 530 {
 531         int slot;
 532         struct ccb_data *data;
 533         struct ilo_hwinfo *hw;
 534         unsigned long flags;
 535
 536         slot = iminor(ip) % MAX_CCB;
 537         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 538
 539         spin_lock(&hw->open_lock);
 540
 541         if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
 542
 543                 data = fp->private_data;
 544
 545                 spin_lock_irqsave(&hw->alloc_lock, flags);
 546                 hw->ccb_alloc[slot] = NULL;
 547                 spin_unlock_irqrestore(&hw->alloc_lock, flags);
 548
 549                 ilo_ccb_close(hw->ilo_dev, data);
 550
 551                 kfree(data);
 552         } else
 553                 hw->ccb_alloc[slot]->ccb_cnt--;
 554
 555         spin_unlock(&hw->open_lock);
 556
 557         return 0;
 558 }
 559
 560 static int ilo_open(struct inode *ip, struct file *fp)
 561 {
 562         int slot, error;
 563         struct ccb_data *data;
 564         struct ilo_hwinfo *hw;
 565         unsigned long flags;
 566
 567         slot = iminor(ip) % MAX_CCB;
 568         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 569
 570         /* new ccb allocation */
 571         data = kzalloc(sizeof(*data), GFP_KERNEL);
 572         if (!data)
 573                 return -ENOMEM;
 574
 575         spin_lock(&hw->open_lock);
 576
 577         /* each fd private_data holds sw/hw view of ccb */
 578         if (hw->ccb_alloc[slot] == NULL) {
 579                 /* create a channel control block for this minor */
 580                 error = ilo_ccb_setup(hw, data, slot);
 581                 if (error) {
 582                         kfree(data);
 583                         goto out;
 584                 }
 585
 586                 data->ccb_cnt = 1;
 587                 data->ccb_excl = fp->f_flags & O_EXCL;
 588                 data->ilo_hw = hw;
 589                 init_waitqueue_head(&data->ccb_waitq);
 590
 591                 /* write the ccb to hw */
 592                 spin_lock_irqsave(&hw->alloc_lock, flags);
 593                 ilo_ccb_open(hw, data, slot);
 594                 hw->ccb_alloc[slot] = data;
 595                 spin_unlock_irqrestore(&hw->alloc_lock, flags);
 596
 597                 /* make sure the channel is functional */
 598                 error = ilo_ccb_verify(hw, data);
 599                 if (error) {
 600
 601                         spin_lock_irqsave(&hw->alloc_lock, flags);
 602                         hw->ccb_alloc[slot] = NULL;
 603                         spin_unlock_irqrestore(&hw->alloc_lock, flags);
 604
 605                         ilo_ccb_close(hw->ilo_dev, data);
 606
 607                         kfree(data);
 608                         goto out;
 609                 }
 610
 611         } else {
 612                 kfree(data);
 613                 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
 614                         /*
 615                          * The channel exists, and either this open
 616                          * or a previous open of this channel wants
 617                          * exclusive access.
 618                          */
 619                         error = -EBUSY;
 620                 } else {
 621                         hw->ccb_alloc[slot]->ccb_cnt++;
 622                         error = 0;
 623                 }
 624         }
 625 out:
 626         spin_unlock(&hw->open_lock);
 627
 628         if (!error)
 629                 fp->private_data = hw->ccb_alloc[slot];
 630
 631         return error;
 632 }
 633
 634 static const struct file_operations ilo_fops = {
 635         .owner          = THIS_MODULE,
 636         .read           = ilo_read,
 637         .write          = ilo_write,
 638         .poll           = ilo_poll,
 639         .open           = ilo_open,
 640         .release        = ilo_close,
 641 };
 642
 643 static irqreturn_t ilo_isr(int irq, void *data)
 644 {
 645         struct ilo_hwinfo *hw = data;
 646         int pending, i;
 647
 648         spin_lock(&hw->alloc_lock);
 649
 650         /* check for ccbs which have data */
 651         pending = get_device_outbound(hw);
 652         if (!pending) {
 653                 spin_unlock(&hw->alloc_lock);
 654                 return IRQ_NONE;
 655         }
 656
 657         if (is_db_reset(pending)) {
 658                 /* wake up all ccbs if the device was reset */
 659                 pending = -1;
 660                 ilo_set_reset(hw);
 661         }
 662
 663         for (i = 0; i < MAX_CCB; i++) {
 664                 if (!hw->ccb_alloc[i])
 665                         continue;
 666                 if (pending & (1 << i))
 667                         wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
 668         }
 669
 670         /* clear the device of the channels that have been handled */
 671         clear_pending_db(hw, pending);
 672
 673         spin_unlock(&hw->alloc_lock);
 674
 675         return IRQ_HANDLED;
 676 }
 677
 678 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 679 {
 680         pci_iounmap(pdev, hw->db_vaddr);
 681         pci_iounmap(pdev, hw->ram_vaddr);
 682         pci_iounmap(pdev, hw->mmio_vaddr);
 683 }
 684
 685 static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 686 {
 687         int error = -ENOMEM;
 688
 689         /* map the memory mapped i/o registers */
 690         hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
 691         if (hw->mmio_vaddr == NULL) {
 692                 dev_err(&pdev->dev, "Error mapping mmio\n");
 693                 goto out;
 694         }
 695
 696         /* map the adapter shared memory region */
 697         hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
 698         if (hw->ram_vaddr == NULL) {
 699                 dev_err(&pdev->dev, "Error mapping shared mem\n");
 700                 goto mmio_free;
 701         }
 702
 703         /* map the doorbell aperture */
 704         hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
 705         if (hw->db_vaddr == NULL) {
 706                 dev_err(&pdev->dev, "Error mapping doorbell\n");
 707                 goto ram_free;
 708         }
 709
 710         return 0;
 711 ram_free:
 712         pci_iounmap(pdev, hw->ram_vaddr);
 713 mmio_free:
 714         pci_iounmap(pdev, hw->mmio_vaddr);
 715 out:
 716         return error;
 717 }
 718
 719 static void ilo_remove(struct pci_dev *pdev)
 720 {
 721         int i, minor;
 722         struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
 723
 724         clear_device(ilo_hw);
 725
 726         minor = MINOR(ilo_hw->cdev.dev);
 727         for (i = minor; i < minor + MAX_CCB; i++)
 728                 device_destroy(ilo_class, MKDEV(ilo_major, i));
 729
 730         cdev_del(&ilo_hw->cdev);
 731         ilo_disable_interrupts(ilo_hw);
 732         free_irq(pdev->irq, ilo_hw);
 733         ilo_unmap_device(pdev, ilo_hw);
 734         pci_release_regions(pdev);
 735         pci_disable_device(pdev);
 736         kfree(ilo_hw);
 737         ilo_hwdev[(minor / MAX_CCB)] = 0;
 738 }
 739
 740 static int __devinit ilo_probe(struct pci_dev *pdev,
 741                                const struct pci_device_id *ent)
 742 {
 743         int devnum, minor, start, error;
 744         struct ilo_hwinfo *ilo_hw;
 745
 746         /* find a free range for device files */
 747         for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
 748                 if (ilo_hwdev[devnum] == 0) {
 749                         ilo_hwdev[devnum] = 1;
 750                         break;
 751                 }
 752         }
 753
 754         if (devnum == MAX_ILO_DEV) {
 755                 dev_err(&pdev->dev, "Error finding free device\n");
 756                 return -ENODEV;
 757         }
 758
 759         /* track global allocations for this device */
 760         error = -ENOMEM;
 761         ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
 762         if (!ilo_hw)
 763                 goto out;
 764
 765         ilo_hw->ilo_dev = pdev;
 766         spin_lock_init(&ilo_hw->alloc_lock);
 767         spin_lock_init(&ilo_hw->fifo_lock);
 768         spin_lock_init(&ilo_hw->open_lock);
 769
 770         error = pci_enable_device(pdev);
 771         if (error)
 772                 goto free;
 773
 774         pci_set_master(pdev);
 775
 776         error = pci_request_regions(pdev, ILO_NAME);
 777         if (error)
 778                 goto disable;
 779
 780         error = ilo_map_device(pdev, ilo_hw);
 781         if (error)
 782                 goto free_regions;
 783
 784         pci_set_drvdata(pdev, ilo_hw);
 785         clear_device(ilo_hw);
 786
 787         error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
 788         if (error)
 789                 goto unmap;
 790
 791         ilo_enable_interrupts(ilo_hw);
 792
 793         cdev_init(&ilo_hw->cdev, &ilo_fops);
 794         ilo_hw->cdev.owner = THIS_MODULE;
 795         start = devnum * MAX_CCB;
 796         error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
 797         if (error) {
 798                 dev_err(&pdev->dev, "Could not add cdev\n");
 799                 goto remove_isr;
 800         }
 801
 802         for (minor = 0 ; minor < MAX_CCB; minor++) {
 803                 struct device *dev;
 804                 dev = device_create(ilo_class, &pdev->dev,
 805                                     MKDEV(ilo_major, minor), NULL,
 806                                     "hpilo!d%dccb%d", devnum, minor);
 807                 if (IS_ERR(dev))
 808                         dev_err(&pdev->dev, "Could not create files\n");
 809         }
 810
 811         return 0;
 812 remove_isr:
 813         ilo_disable_interrupts(ilo_hw);
 814         free_irq(pdev->irq, ilo_hw);
 815 unmap:
 816         ilo_unmap_device(pdev, ilo_hw);
 817 free_regions:
 818         pci_release_regions(pdev);
 819 disable:
 820         pci_disable_device(pdev);
 821 free:
 822         kfree(ilo_hw);
 823 out:
 824         ilo_hwdev[devnum] = 0;
 825         return error;
 826 }
 827
 828 static struct pci_device_id ilo_devices[] = {
 829         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
 830         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
 831         { }
 832 };
 833 MODULE_DEVICE_TABLE(pci, ilo_devices);
 834
 835 static struct pci_driver ilo_driver = {
 836         .name     = ILO_NAME,
 837         .id_table = ilo_devices,
 838         .probe    = ilo_probe,
 839         .remove   = __devexit_p(ilo_remove),
 840 };
 841
 842 static int __init ilo_init(void)
 843 {
 844         int error;
 845         dev_t dev;
 846
 847         ilo_class = class_create(THIS_MODULE, "iLO");
 848         if (IS_ERR(ilo_class)) {
 849                 error = PTR_ERR(ilo_class);
 850                 goto out;
 851         }
 852
 853         error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
 854         if (error)
 855                 goto class_destroy;
 856
 857         ilo_major = MAJOR(dev);
 858
 859         error = pci_register_driver(&ilo_driver);
 860         if (error)
 861                 goto chr_remove;
 862
 863         return 0;
 864 chr_remove:
 865         unregister_chrdev_region(dev, MAX_OPEN);
 866 class_destroy:
 867         class_destroy(ilo_class);
 868 out:
 869         return error;
 870 }
 871
 872 static void __exit ilo_exit(void)
 873 {
 874         pci_unregister_driver(&ilo_driver);
 875         unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
 876         class_destroy(ilo_class);
 877 }
 878
 879 MODULE_VERSION("1.2");
 880 MODULE_ALIAS(ILO_NAME);
 881 MODULE_DESCRIPTION(ILO_NAME);
 882 MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
 883 MODULE_LICENSE("GPL v2");
 884
 885 module_init(ilo_init);
 886 module_exit(ilo_exit);