drivers/misc/hpilo.c

   1 /*
   2  * Driver for the HP iLO 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 <linux/slab.h>
  29 #include "hpilo.h"
  30
  31 static struct class *ilo_class;
  32 static unsigned int ilo_major;
  33 static char ilo_hwdev[MAX_ILO_DEV];
  34
  35 static inline int get_entry_id(int entry)
  36 {
  37         return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
  38 }
  39
  40 static inline int get_entry_len(int entry)
  41 {
  42         return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
  43 }
  44
  45 static inline int mk_entry(int id, int len)
  46 {
  47         int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
  48         return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
  49 }
  50
  51 static inline int desc_mem_sz(int nr_entry)
  52 {
  53         return nr_entry << L2_QENTRY_SZ;
  54 }
  55
  56 /*
  57  * FIFO queues, shared with hardware.
  58  *
  59  * If a queue has empty slots, an entry is added to the queue tail,
  60  * and that entry is marked as occupied.
  61  * Entries can be dequeued from the head of the list, when the device
  62  * has marked the entry as consumed.
  63  *
  64  * Returns true on successful queue/dequeue, false on failure.
  65  */
  66 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
  67 {
  68         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  69         unsigned long flags;
  70         int ret = 0;
  71
  72         spin_lock_irqsave(&hw->fifo_lock, flags);
  73         if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
  74               & ENTRY_MASK_O)) {
  75                 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
  76                                 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
  77                 fifo_q->tail += 1;
  78                 ret = 1;
  79         }
  80         spin_unlock_irqrestore(&hw->fifo_lock, flags);
  81
  82         return ret;
  83 }
  84
  85 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
  86 {
  87         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
  88         unsigned long flags;
  89         int ret = 0;
  90         u64 c;
  91
  92         spin_lock_irqsave(&hw->fifo_lock, flags);
  93         c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
  94         if (c & ENTRY_MASK_C) {
  95                 if (entry)
  96                         *entry = c & ENTRY_MASK_NOSTATE;
  97
  98                 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
  99                                                         (c | ENTRY_MASK) + 1;
 100                 fifo_q->head += 1;
 101                 ret = 1;
 102         }
 103         spin_unlock_irqrestore(&hw->fifo_lock, flags);
 104
 105         return ret;
 106 }
 107
 108 static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
 109 {
 110         struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
 111         unsigned long flags;
 112         int ret = 0;
 113         u64 c;
 114
 115         spin_lock_irqsave(&hw->fifo_lock, flags);
 116         c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
 117         if (c & ENTRY_MASK_C)
 118                 ret = 1;
 119         spin_unlock_irqrestore(&hw->fifo_lock, flags);
 120
 121         return ret;
 122 }
 123
 124 static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
 125                            int dir, int id, int len)
 126 {
 127         char *fifobar;
 128         int entry;
 129
 130         if (dir == SENDQ)
 131                 fifobar = ccb->ccb_u1.send_fifobar;
 132         else
 133                 fifobar = ccb->ccb_u3.recv_fifobar;
 134
 135         entry = mk_entry(id, len);
 136         return fifo_enqueue(hw, fifobar, entry);
 137 }
 138
 139 static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
 140                            int dir, int *id, int *len, void **pkt)
 141 {
 142         char *fifobar, *desc;
 143         int entry = 0, pkt_id = 0;
 144         int ret;
 145
 146         if (dir == SENDQ) {
 147                 fifobar = ccb->ccb_u1.send_fifobar;
 148                 desc = ccb->ccb_u2.send_desc;
 149         } else {
 150                 fifobar = ccb->ccb_u3.recv_fifobar;
 151                 desc = ccb->ccb_u4.recv_desc;
 152         }
 153
 154         ret = fifo_dequeue(hw, fifobar, &entry);
 155         if (ret) {
 156                 pkt_id = get_entry_id(entry);
 157                 if (id)
 158                         *id = pkt_id;
 159                 if (len)
 160                         *len = get_entry_len(entry);
 161                 if (pkt)
 162                         *pkt = (void *)(desc + desc_mem_sz(pkt_id));
 163         }
 164
 165         return ret;
 166 }
 167
 168 static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
 169 {
 170         char *fifobar = ccb->ccb_u3.recv_fifobar;
 171
 172         return fifo_check_recv(hw, fifobar);
 173 }
 174
 175 static inline void doorbell_set(struct ccb *ccb)
 176 {
 177         iowrite8(1, ccb->ccb_u5.db_base);
 178 }
 179
 180 static inline void doorbell_clr(struct ccb *ccb)
 181 {
 182         iowrite8(2, ccb->ccb_u5.db_base);
 183 }
 184
 185 static inline int ctrl_set(int l2sz, int idxmask, int desclim)
 186 {
 187         int active = 0, go = 1;
 188         return l2sz << CTRL_BITPOS_L2SZ |
 189                idxmask << CTRL_BITPOS_FIFOINDEXMASK |
 190                desclim << CTRL_BITPOS_DESCLIMIT |
 191                active << CTRL_BITPOS_A |
 192                go << CTRL_BITPOS_G;
 193 }
 194
 195 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
 196 {
 197         /* for simplicity, use the same parameters for send and recv ctrls */
 198         ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 199         ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
 200 }
 201
 202 static inline int fifo_sz(int nr_entry)
 203 {
 204         /* size of a fifo is determined by the number of entries it contains */
 205         return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
 206 }
 207
 208 static void fifo_setup(void *base_addr, int nr_entry)
 209 {
 210         struct fifo *fifo_q = base_addr;
 211         int i;
 212
 213         /* set up an empty fifo */
 214         fifo_q->head = 0;
 215         fifo_q->tail = 0;
 216         fifo_q->reset = 0;
 217         fifo_q->nrents = nr_entry;
 218         fifo_q->imask = nr_entry - 1;
 219         fifo_q->merge = ENTRY_MASK_O;
 220
 221         for (i = 0; i < nr_entry; i++)
 222                 fifo_q->fifobar[i] = 0;
 223 }
 224
 225 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
 226 {
 227         struct ccb *driver_ccb = &data->driver_ccb;
 228         struct ccb __iomem *device_ccb = data->mapped_ccb;
 229         int retries;
 230
 231         /* complicated dance to tell the hw we are stopping */
 232         doorbell_clr(driver_ccb);
 233         iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
 234                   &device_ccb->send_ctrl);
 235         iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
 236                   &device_ccb->recv_ctrl);
 237
 238         /* give iLO some time to process stop request */
 239         for (retries = MAX_WAIT; retries > 0; retries--) {
 240                 doorbell_set(driver_ccb);
 241                 udelay(WAIT_TIME);
 242                 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
 243                     &&
 244                     !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
 245                         break;
 246         }
 247         if (retries == 0)
 248                 dev_err(&pdev->dev, "Closing, but controller still active\n");
 249
 250         /* clear the hw ccb */
 251         memset_io(device_ccb, 0, sizeof(struct ccb));
 252
 253         /* free resources used to back send/recv queues */
 254         pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
 255 }
 256
 257 static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 258 {
 259         char *dma_va;
 260         dma_addr_t dma_pa;
 261         struct ccb *driver_ccb, *ilo_ccb;
 262
 263         driver_ccb = &data->driver_ccb;
 264         ilo_ccb = &data->ilo_ccb;
 265
 266         data->dma_size = 2 * fifo_sz(NR_QENTRY) +
 267                          2 * desc_mem_sz(NR_QENTRY) +
 268                          ILO_START_ALIGN + ILO_CACHE_SZ;
 269
 270         data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
 271                                             &data->dma_pa);
 272         if (!data->dma_va)
 273                 return -ENOMEM;
 274
 275         dma_va = (char *)data->dma_va;
 276         dma_pa = data->dma_pa;
 277
 278         memset(dma_va, 0, data->dma_size);
 279
 280         dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
 281         dma_pa = roundup(dma_pa, ILO_START_ALIGN);
 282
 283         /*
 284          * Create two ccb's, one with virt addrs, one with phys addrs.
 285          * Copy the phys addr ccb to device shared mem.
 286          */
 287         ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
 288         ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
 289
 290         fifo_setup(dma_va, NR_QENTRY);
 291         driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
 292         ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE;
 293         dma_va += fifo_sz(NR_QENTRY);
 294         dma_pa += fifo_sz(NR_QENTRY);
 295
 296         dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
 297         dma_pa = roundup(dma_pa, ILO_CACHE_SZ);
 298
 299         fifo_setup(dma_va, NR_QENTRY);
 300         driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
 301         ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE;
 302         dma_va += fifo_sz(NR_QENTRY);
 303         dma_pa += fifo_sz(NR_QENTRY);
 304
 305         driver_ccb->ccb_u2.send_desc = dma_va;
 306         ilo_ccb->ccb_u2.send_desc_pa = dma_pa;
 307         dma_pa += desc_mem_sz(NR_QENTRY);
 308         dma_va += desc_mem_sz(NR_QENTRY);
 309
 310         driver_ccb->ccb_u4.recv_desc = dma_va;
 311         ilo_ccb->ccb_u4.recv_desc_pa = dma_pa;
 312
 313         driver_ccb->channel = slot;
 314         ilo_ccb->channel = slot;
 315
 316         driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
 317         ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
 318
 319         return 0;
 320 }
 321
 322 static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 323 {
 324         int pkt_id, pkt_sz;
 325         struct ccb *driver_ccb = &data->driver_ccb;
 326
 327         /* copy the ccb with physical addrs to device memory */
 328         data->mapped_ccb = (struct ccb __iomem *)
 329                                 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
 330         memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
 331
 332         /* put packets on the send and receive queues */
 333         pkt_sz = 0;
 334         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
 335                 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
 336                 doorbell_set(driver_ccb);
 337         }
 338
 339         pkt_sz = desc_mem_sz(1);
 340         for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
 341                 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
 342
 343         /* the ccb is ready to use */
 344         doorbell_clr(driver_ccb);
 345 }
 346
 347 static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
 348 {
 349         int pkt_id, i;
 350         struct ccb *driver_ccb = &data->driver_ccb;
 351
 352         /* make sure iLO is really handling requests */
 353         for (i = MAX_WAIT; i > 0; i--) {
 354                 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
 355                         break;
 356                 udelay(WAIT_TIME);
 357         }
 358
 359         if (i == 0) {
 360                 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
 361                 return -EBUSY;
 362         }
 363
 364         ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
 365         doorbell_set(driver_ccb);
 366         return 0;
 367 }
 368
 369 static inline int is_channel_reset(struct ccb *ccb)
 370 {
 371         /* check for this particular channel needing a reset */
 372         return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
 373 }
 374
 375 static inline void set_channel_reset(struct ccb *ccb)
 376 {
 377         /* set a flag indicating this channel needs a reset */
 378         FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
 379 }
 380
 381 static inline int get_device_outbound(struct ilo_hwinfo *hw)
 382 {
 383         return ioread32(&hw->mmio_vaddr[DB_OUT]);
 384 }
 385
 386 static inline int is_db_reset(int db_out)
 387 {
 388         return db_out & (1 << DB_RESET);
 389 }
 390
 391 static inline int is_device_reset(struct ilo_hwinfo *hw)
 392 {
 393         /* check for global reset condition */
 394         return is_db_reset(get_device_outbound(hw));
 395 }
 396
 397 static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
 398 {
 399         iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
 400 }
 401
 402 static inline void clear_device(struct ilo_hwinfo *hw)
 403 {
 404         /* clear the device (reset bits, pending channel entries) */
 405         clear_pending_db(hw, -1);
 406 }
 407
 408 static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
 409 {
 410         iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
 411 }
 412
 413 static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
 414 {
 415         iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
 416                  &hw->mmio_vaddr[DB_IRQ]);
 417 }
 418
 419 static void ilo_set_reset(struct ilo_hwinfo *hw)
 420 {
 421         int slot;
 422
 423         /*
 424          * Mapped memory is zeroed on ilo reset, so set a per ccb flag
 425          * to indicate that this ccb needs to be closed and reopened.
 426          */
 427         for (slot = 0; slot < MAX_CCB; slot++) {
 428                 if (!hw->ccb_alloc[slot])
 429                         continue;
 430                 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
 431         }
 432 }
 433
 434 static ssize_t ilo_read(struct file *fp, char __user *buf,
 435                         size_t len, loff_t *off)
 436 {
 437         int err, found, cnt, pkt_id, pkt_len;
 438         struct ccb_data *data = fp->private_data;
 439         struct ccb *driver_ccb = &data->driver_ccb;
 440         struct ilo_hwinfo *hw = data->ilo_hw;
 441         void *pkt;
 442
 443         if (is_channel_reset(driver_ccb)) {
 444                 /*
 445                  * If the device has been reset, applications
 446                  * need to close and reopen all ccbs.
 447                  */
 448                 return -ENODEV;
 449         }
 450
 451         /*
 452          * This function is to be called when data is expected
 453          * in the channel, and will return an error if no packet is found
 454          * during the loop below.  The sleep/retry logic is to allow
 455          * applications to call read() immediately post write(),
 456          * and give iLO some time to process the sent packet.
 457          */
 458         cnt = 20;
 459         do {
 460                 /* look for a received packet */
 461                 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
 462                                         &pkt_len, &pkt);
 463                 if (found)
 464                         break;
 465                 cnt--;
 466                 msleep(100);
 467         } while (!found && cnt);
 468
 469         if (!found)
 470                 return -EAGAIN;
 471
 472         /* only copy the length of the received packet */
 473         if (pkt_len < len)
 474                 len = pkt_len;
 475
 476         err = copy_to_user(buf, pkt, len);
 477
 478         /* return the received packet to the queue */
 479         ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
 480
 481         return err ? -EFAULT : len;
 482 }
 483
 484 static ssize_t ilo_write(struct file *fp, const char __user *buf,
 485                          size_t len, loff_t *off)
 486 {
 487         int err, pkt_id, pkt_len;
 488         struct ccb_data *data = fp->private_data;
 489         struct ccb *driver_ccb = &data->driver_ccb;
 490         struct ilo_hwinfo *hw = data->ilo_hw;
 491         void *pkt;
 492
 493         if (is_channel_reset(driver_ccb))
 494                 return -ENODEV;
 495
 496         /* get a packet to send the user command */
 497         if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
 498                 return -EBUSY;
 499
 500         /* limit the length to the length of the packet */
 501         if (pkt_len < len)
 502                 len = pkt_len;
 503
 504         /* on failure, set the len to 0 to return empty packet to the device */
 505         err = copy_from_user(pkt, buf, len);
 506         if (err)
 507                 len = 0;
 508
 509         /* send the packet */
 510         ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
 511         doorbell_set(driver_ccb);
 512
 513         return err ? -EFAULT : len;
 514 }
 515
 516 static unsigned int ilo_poll(struct file *fp, poll_table *wait)
 517 {
 518         struct ccb_data *data = fp->private_data;
 519         struct ccb *driver_ccb = &data->driver_ccb;
 520
 521         poll_wait(fp, &data->ccb_waitq, wait);
 522
 523         if (is_channel_reset(driver_ccb))
 524                 return POLLERR;
 525         else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
 526                 return POLLIN | POLLRDNORM;
 527
 528         return 0;
 529 }
 530
 531 static int ilo_close(struct inode *ip, struct file *fp)
 532 {
 533         int slot;
 534         struct ccb_data *data;
 535         struct ilo_hwinfo *hw;
 536         unsigned long flags;
 537
 538         slot = iminor(ip) % MAX_CCB;
 539         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 540
 541         spin_lock(&hw->open_lock);
 542
 543         if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
 544
 545                 data = fp->private_data;
 546
 547                 spin_lock_irqsave(&hw->alloc_lock, flags);
 548                 hw->ccb_alloc[slot] = NULL;
 549                 spin_unlock_irqrestore(&hw->alloc_lock, flags);
 550
 551                 ilo_ccb_close(hw->ilo_dev, data);
 552
 553                 kfree(data);
 554         } else
 555                 hw->ccb_alloc[slot]->ccb_cnt--;
 556
 557         spin_unlock(&hw->open_lock);
 558
 559         return 0;
 560 }
 561
 562 static int ilo_open(struct inode *ip, struct file *fp)
 563 {
 564         int slot, error;
 565         struct ccb_data *data;
 566         struct ilo_hwinfo *hw;
 567         unsigned long flags;
 568
 569         slot = iminor(ip) % MAX_CCB;
 570         hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 571
 572         /* new ccb allocation */
 573         data = kzalloc(sizeof(*data), GFP_KERNEL);
 574         if (!data)
 575                 return -ENOMEM;
 576
 577         spin_lock(&hw->open_lock);
 578
 579         /* each fd private_data holds sw/hw view of ccb */
 580         if (hw->ccb_alloc[slot] == NULL) {
 581                 /* create a channel control block for this minor */
 582                 error = ilo_ccb_setup(hw, data, slot);
 583                 if (error) {
 584                         kfree(data);
 585                         goto out;
 586                 }
 587
 588                 data->ccb_cnt = 1;
 589                 data->ccb_excl = fp->f_flags & O_EXCL;
 590                 data->ilo_hw = hw;
 591                 init_waitqueue_head(&data->ccb_waitq);
 592
 593                 /* write the ccb to hw */
 594                 spin_lock_irqsave(&hw->alloc_lock, flags);
 595                 ilo_ccb_open(hw, data, slot);
 596                 hw->ccb_alloc[slot] = data;
 597                 spin_unlock_irqrestore(&hw->alloc_lock, flags);
 598
 599                 /* make sure the channel is functional */
 600                 error = ilo_ccb_verify(hw, data);
 601                 if (error) {
 602
 603                         spin_lock_irqsave(&hw->alloc_lock, flags);
 604                         hw->ccb_alloc[slot] = NULL;
 605                         spin_unlock_irqrestore(&hw->alloc_lock, flags);
 606
 607                         ilo_ccb_close(hw->ilo_dev, data);
 608
 609                         kfree(data);
 610                         goto out;
 611                 }
 612
 613         } else {
 614                 kfree(data);
 615                 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
 616                         /*
 617                          * The channel exists, and either this open
 618                          * or a previous open of this channel wants
 619                          * exclusive access.
 620                          */
 621                         error = -EBUSY;
 622                 } else {
 623                         hw->ccb_alloc[slot]->ccb_cnt++;
 624                         error = 0;
 625                 }
 626         }
 627 out:
 628         spin_unlock(&hw->open_lock);
 629
 630         if (!error)
 631                 fp->private_data = hw->ccb_alloc[slot];
 632
 633         return error;
 634 }
 635
 636 static const struct file_operations ilo_fops = {
 637         .owner          = THIS_MODULE,
 638         .read           = ilo_read,
 639         .write          = ilo_write,
 640         .poll           = ilo_poll,
 641         .open           = ilo_open,
 642         .release        = ilo_close,
 643         .llseek         = noop_llseek,
 644 };
 645
 646 static irqreturn_t ilo_isr(int irq, void *data)
 647 {
 648         struct ilo_hwinfo *hw = data;
 649         int pending, i;
 650
 651         spin_lock(&hw->alloc_lock);
 652
 653         /* check for ccbs which have data */
 654         pending = get_device_outbound(hw);
 655         if (!pending) {
 656                 spin_unlock(&hw->alloc_lock);
 657                 return IRQ_NONE;
 658         }
 659
 660         if (is_db_reset(pending)) {
 661                 /* wake up all ccbs if the device was reset */
 662                 pending = -1;
 663                 ilo_set_reset(hw);
 664         }
 665
 666         for (i = 0; i < MAX_CCB; i++) {
 667                 if (!hw->ccb_alloc[i])
 668                         continue;
 669                 if (pending & (1 << i))
 670                         wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
 671         }
 672
 673         /* clear the device of the channels that have been handled */
 674         clear_pending_db(hw, pending);
 675
 676         spin_unlock(&hw->alloc_lock);
 677
 678         return IRQ_HANDLED;
 679 }
 680
 681 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 682 {
 683         pci_iounmap(pdev, hw->db_vaddr);
 684         pci_iounmap(pdev, hw->ram_vaddr);
 685         pci_iounmap(pdev, hw->mmio_vaddr);
 686 }
 687
 688 static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 689 {
 690         int error = -ENOMEM;
 691
 692         /* map the memory mapped i/o registers */
 693         hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
 694         if (hw->mmio_vaddr == NULL) {
 695                 dev_err(&pdev->dev, "Error mapping mmio\n");
 696                 goto out;
 697         }
 698
 699         /* map the adapter shared memory region */
 700         hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
 701         if (hw->ram_vaddr == NULL) {
 702                 dev_err(&pdev->dev, "Error mapping shared mem\n");
 703                 goto mmio_free;
 704         }
 705
 706         /* map the doorbell aperture */
 707         hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
 708         if (hw->db_vaddr == NULL) {
 709                 dev_err(&pdev->dev, "Error mapping doorbell\n");
 710                 goto ram_free;
 711         }
 712
 713         return 0;
 714 ram_free:
 715         pci_iounmap(pdev, hw->ram_vaddr);
 716 mmio_free:
 717         pci_iounmap(pdev, hw->mmio_vaddr);
 718 out:
 719         return error;
 720 }
 721
 722 static void ilo_remove(struct pci_dev *pdev)
 723 {
 724         int i, minor;
 725         struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
 726
 727         clear_device(ilo_hw);
 728
 729         minor = MINOR(ilo_hw->cdev.dev);
 730         for (i = minor; i < minor + MAX_CCB; i++)
 731                 device_destroy(ilo_class, MKDEV(ilo_major, i));
 732
 733         cdev_del(&ilo_hw->cdev);
 734         ilo_disable_interrupts(ilo_hw);
 735         free_irq(pdev->irq, ilo_hw);
 736         ilo_unmap_device(pdev, ilo_hw);
 737         pci_release_regions(pdev);
 738         pci_disable_device(pdev);
 739         kfree(ilo_hw);
 740         ilo_hwdev[(minor / MAX_CCB)] = 0;
 741 }
 742
 743 static int __devinit ilo_probe(struct pci_dev *pdev,
 744                                const struct pci_device_id *ent)
 745 {
 746         int devnum, minor, start, error;
 747         struct ilo_hwinfo *ilo_hw;
 748
 749         /* find a free range for device files */
 750         for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
 751                 if (ilo_hwdev[devnum] == 0) {
 752                         ilo_hwdev[devnum] = 1;
 753                         break;
 754                 }
 755         }
 756
 757         if (devnum == MAX_ILO_DEV) {
 758                 dev_err(&pdev->dev, "Error finding free device\n");
 759                 return -ENODEV;
 760         }
 761
 762         /* track global allocations for this device */
 763         error = -ENOMEM;
 764         ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
 765         if (!ilo_hw)
 766                 goto out;
 767
 768         ilo_hw->ilo_dev = pdev;
 769         spin_lock_init(&ilo_hw->alloc_lock);
 770         spin_lock_init(&ilo_hw->fifo_lock);
 771         spin_lock_init(&ilo_hw->open_lock);
 772
 773         error = pci_enable_device(pdev);
 774         if (error)
 775                 goto free;
 776
 777         pci_set_master(pdev);
 778
 779         error = pci_request_regions(pdev, ILO_NAME);
 780         if (error)
 781                 goto disable;
 782
 783         error = ilo_map_device(pdev, ilo_hw);
 784         if (error)
 785                 goto free_regions;
 786
 787         pci_set_drvdata(pdev, ilo_hw);
 788         clear_device(ilo_hw);
 789
 790         error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
 791         if (error)
 792                 goto unmap;
 793
 794         ilo_enable_interrupts(ilo_hw);
 795
 796         cdev_init(&ilo_hw->cdev, &ilo_fops);
 797         ilo_hw->cdev.owner = THIS_MODULE;
 798         start = devnum * MAX_CCB;
 799         error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
 800         if (error) {
 801                 dev_err(&pdev->dev, "Could not add cdev\n");
 802                 goto remove_isr;
 803         }
 804
 805         for (minor = 0 ; minor < MAX_CCB; minor++) {
 806                 struct device *dev;
 807                 dev = device_create(ilo_class, &pdev->dev,
 808                                     MKDEV(ilo_major, minor), NULL,
 809                                     "hpilo!d%dccb%d", devnum, minor);
 810                 if (IS_ERR(dev))
 811                         dev_err(&pdev->dev, "Could not create files\n");
 812         }
 813
 814         return 0;
 815 remove_isr:
 816         ilo_disable_interrupts(ilo_hw);
 817         free_irq(pdev->irq, ilo_hw);
 818 unmap:
 819         ilo_unmap_device(pdev, ilo_hw);
 820 free_regions:
 821         pci_release_regions(pdev);
 822 disable:
 823         pci_disable_device(pdev);
 824 free:
 825         kfree(ilo_hw);
 826 out:
 827         ilo_hwdev[devnum] = 0;
 828         return error;
 829 }
 830
 831 static struct pci_device_id ilo_devices[] = {
 832         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
 833         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
 834         { }
 835 };
 836 MODULE_DEVICE_TABLE(pci, ilo_devices);
 837
 838 static struct pci_driver ilo_driver = {
 839         .name     = ILO_NAME,
 840         .id_table = ilo_devices,
 841         .probe    = ilo_probe,
 842         .remove   = __devexit_p(ilo_remove),
 843 };
 844
 845 static int __init ilo_init(void)
 846 {
 847         int error;
 848         dev_t dev;
 849
 850         ilo_class = class_create(THIS_MODULE, "iLO");
 851         if (IS_ERR(ilo_class)) {
 852                 error = PTR_ERR(ilo_class);
 853                 goto out;
 854         }
 855
 856         error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
 857         if (error)
 858                 goto class_destroy;
 859
 860         ilo_major = MAJOR(dev);
 861
 862         error = pci_register_driver(&ilo_driver);
 863         if (error)
 864                 goto chr_remove;
 865
 866         return 0;
 867 chr_remove:
 868         unregister_chrdev_region(dev, MAX_OPEN);
 869 class_destroy:
 870         class_destroy(ilo_class);
 871 out:
 872         return error;
 873 }
 874
 875 static void __exit ilo_exit(void)
 876 {
 877         pci_unregister_driver(&ilo_driver);
 878         unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
 879         class_destroy(ilo_class);
 880 }
 881
 882 MODULE_VERSION("1.2");
 883 MODULE_ALIAS(ILO_NAME);
 884 MODULE_DESCRIPTION(ILO_NAME);
 885 MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
 886 MODULE_LICENSE("GPL v2");
 887
 888 module_init(ilo_init);
 889 module_exit(ilo_exit);