arch/sparc64/kernel/ebus.c

   1 /* $Id: ebus.c,v 1.64 2001/11/08 04:41:33 davem Exp $
   2  * ebus.c: PCI to EBus bridge device.
   3  *
   4  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   5  * Copyright (C) 1999  David S. Miller (davem@redhat.com)
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/delay.h>
  17
  18 #include <asm/system.h>
  19 #include <asm/page.h>
  20 #include <asm/pbm.h>
  21 #include <asm/ebus.h>
  22 #include <asm/oplib.h>
  23 #include <asm/bpp.h>
  24 #include <asm/irq.h>
  25
  26 /* EBUS dma library. */
  27
  28 #define EBDMA_CSR       0x00UL  /* Control/Status */
  29 #define EBDMA_ADDR      0x04UL  /* DMA Address */
  30 #define EBDMA_COUNT     0x08UL  /* DMA Count */
  31
  32 #define EBDMA_CSR_INT_PEND      0x00000001
  33 #define EBDMA_CSR_ERR_PEND      0x00000002
  34 #define EBDMA_CSR_DRAIN         0x00000004
  35 #define EBDMA_CSR_INT_EN        0x00000010
  36 #define EBDMA_CSR_RESET         0x00000080
  37 #define EBDMA_CSR_WRITE         0x00000100
  38 #define EBDMA_CSR_EN_DMA        0x00000200
  39 #define EBDMA_CSR_CYC_PEND      0x00000400
  40 #define EBDMA_CSR_DIAG_RD_DONE  0x00000800
  41 #define EBDMA_CSR_DIAG_WR_DONE  0x00001000
  42 #define EBDMA_CSR_EN_CNT        0x00002000
  43 #define EBDMA_CSR_TC            0x00004000
  44 #define EBDMA_CSR_DIS_CSR_DRN   0x00010000
  45 #define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
  46 #define EBDMA_CSR_BURST_SZ_1    0x00080000
  47 #define EBDMA_CSR_BURST_SZ_4    0x00000000
  48 #define EBDMA_CSR_BURST_SZ_8    0x00040000
  49 #define EBDMA_CSR_BURST_SZ_16   0x000c0000
  50 #define EBDMA_CSR_DIAG_EN       0x00100000
  51 #define EBDMA_CSR_DIS_ERR_PEND  0x00400000
  52 #define EBDMA_CSR_TCI_DIS       0x00800000
  53 #define EBDMA_CSR_EN_NEXT       0x01000000
  54 #define EBDMA_CSR_DMA_ON        0x02000000
  55 #define EBDMA_CSR_A_LOADED      0x04000000
  56 #define EBDMA_CSR_NA_LOADED     0x08000000
  57 #define EBDMA_CSR_DEV_ID_MASK   0xf0000000
  58
  59 #define EBUS_DMA_RESET_TIMEOUT  10000
  60
  61 static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
  62 {
  63         int i;
  64         u32 val = 0;
  65
  66         writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
  67         udelay(1);
  68
  69         if (no_drain)
  70                 return;
  71
  72         for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
  73                 val = readl(p->regs + EBDMA_CSR);
  74
  75                 if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
  76                         break;
  77                 udelay(10);
  78         }
  79 }
  80
  81 static irqreturn_t ebus_dma_irq(int irq, void *dev_id, struct pt_regs *regs)
  82 {
  83         struct ebus_dma_info *p = dev_id;
  84         unsigned long flags;
  85         u32 csr = 0;
  86
  87         spin_lock_irqsave(&p->lock, flags);
  88         csr = readl(p->regs + EBDMA_CSR);
  89         writel(csr, p->regs + EBDMA_CSR);
  90         spin_unlock_irqrestore(&p->lock, flags);
  91
  92         if (csr & EBDMA_CSR_ERR_PEND) {
  93                 printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
  94                 p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
  95                 return IRQ_HANDLED;
  96         } else if (csr & EBDMA_CSR_INT_PEND) {
  97                 p->callback(p,
  98                             (csr & EBDMA_CSR_TC) ?
  99                             EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
 100                             p->client_cookie);
 101                 return IRQ_HANDLED;
 102         }
 103
 104         return IRQ_NONE;
 105
 106 }
 107
 108 int ebus_dma_register(struct ebus_dma_info *p)
 109 {
 110         u32 csr;
 111
 112         if (!p->regs)
 113                 return -EINVAL;
 114         if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
 115                          EBUS_DMA_FLAG_TCI_DISABLE))
 116                 return -EINVAL;
 117         if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
 118                 return -EINVAL;
 119         if (!strlen(p->name))
 120                 return -EINVAL;
 121
 122         __ebus_dma_reset(p, 1);
 123
 124         csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
 125
 126         if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
 127                 csr |= EBDMA_CSR_TCI_DIS;
 128
 129         writel(csr, p->regs + EBDMA_CSR);
 130
 131         return 0;
 132 }
 133 EXPORT_SYMBOL(ebus_dma_register);
 134
 135 int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
 136 {
 137         unsigned long flags;
 138         u32 csr;
 139
 140         if (on) {
 141                 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
 142                         if (request_irq(p->irq, ebus_dma_irq, SA_SHIRQ, p->name, p))
 143                                 return -EBUSY;
 144                 }
 145
 146                 spin_lock_irqsave(&p->lock, flags);
 147                 csr = readl(p->regs + EBDMA_CSR);
 148                 csr |= EBDMA_CSR_INT_EN;
 149                 writel(csr, p->regs + EBDMA_CSR);
 150                 spin_unlock_irqrestore(&p->lock, flags);
 151         } else {
 152                 spin_lock_irqsave(&p->lock, flags);
 153                 csr = readl(p->regs + EBDMA_CSR);
 154                 csr &= ~EBDMA_CSR_INT_EN;
 155                 writel(csr, p->regs + EBDMA_CSR);
 156                 spin_unlock_irqrestore(&p->lock, flags);
 157
 158                 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
 159                         free_irq(p->irq, p);
 160                 }
 161         }
 162
 163         return 0;
 164 }
 165 EXPORT_SYMBOL(ebus_dma_irq_enable);
 166
 167 void ebus_dma_unregister(struct ebus_dma_info *p)
 168 {
 169         unsigned long flags;
 170         u32 csr;
 171         int irq_on = 0;
 172
 173         spin_lock_irqsave(&p->lock, flags);
 174         csr = readl(p->regs + EBDMA_CSR);
 175         if (csr & EBDMA_CSR_INT_EN) {
 176                 csr &= ~EBDMA_CSR_INT_EN;
 177                 writel(csr, p->regs + EBDMA_CSR);
 178                 irq_on = 1;
 179         }
 180         spin_unlock_irqrestore(&p->lock, flags);
 181
 182         if (irq_on)
 183                 free_irq(p->irq, p);
 184 }
 185 EXPORT_SYMBOL(ebus_dma_unregister);
 186
 187 int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
 188 {
 189         unsigned long flags;
 190         u32 csr;
 191         int err;
 192
 193         if (len >= (1 << 24))
 194                 return -EINVAL;
 195
 196         spin_lock_irqsave(&p->lock, flags);
 197         csr = readl(p->regs + EBDMA_CSR);
 198         err = -EINVAL;
 199         if (!(csr & EBDMA_CSR_EN_DMA))
 200                 goto out;
 201         err = -EBUSY;
 202         if (csr & EBDMA_CSR_NA_LOADED)
 203                 goto out;
 204
 205         writel(len,      p->regs + EBDMA_COUNT);
 206         writel(bus_addr, p->regs + EBDMA_ADDR);
 207         err = 0;
 208
 209 out:
 210         spin_unlock_irqrestore(&p->lock, flags);
 211
 212         return err;
 213 }
 214 EXPORT_SYMBOL(ebus_dma_request);
 215
 216 void ebus_dma_prepare(struct ebus_dma_info *p, int write)
 217 {
 218         unsigned long flags;
 219         u32 csr;
 220
 221         spin_lock_irqsave(&p->lock, flags);
 222         __ebus_dma_reset(p, 0);
 223
 224         csr = (EBDMA_CSR_INT_EN |
 225                EBDMA_CSR_EN_CNT |
 226                EBDMA_CSR_BURST_SZ_16 |
 227                EBDMA_CSR_EN_NEXT);
 228
 229         if (write)
 230                 csr |= EBDMA_CSR_WRITE;
 231         if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
 232                 csr |= EBDMA_CSR_TCI_DIS;
 233
 234         writel(csr, p->regs + EBDMA_CSR);
 235
 236         spin_unlock_irqrestore(&p->lock, flags);
 237 }
 238 EXPORT_SYMBOL(ebus_dma_prepare);
 239
 240 unsigned int ebus_dma_residue(struct ebus_dma_info *p)
 241 {
 242         return readl(p->regs + EBDMA_COUNT);
 243 }
 244 EXPORT_SYMBOL(ebus_dma_residue);
 245
 246 unsigned int ebus_dma_addr(struct ebus_dma_info *p)
 247 {
 248         return readl(p->regs + EBDMA_ADDR);
 249 }
 250 EXPORT_SYMBOL(ebus_dma_addr);
 251
 252 void ebus_dma_enable(struct ebus_dma_info *p, int on)
 253 {
 254         unsigned long flags;
 255         u32 orig_csr, csr;
 256
 257         spin_lock_irqsave(&p->lock, flags);
 258         orig_csr = csr = readl(p->regs + EBDMA_CSR);
 259         if (on)
 260                 csr |= EBDMA_CSR_EN_DMA;
 261         else
 262                 csr &= ~EBDMA_CSR_EN_DMA;
 263         if ((orig_csr & EBDMA_CSR_EN_DMA) !=
 264             (csr & EBDMA_CSR_EN_DMA))
 265                 writel(csr, p->regs + EBDMA_CSR);
 266         spin_unlock_irqrestore(&p->lock, flags);
 267 }
 268 EXPORT_SYMBOL(ebus_dma_enable);
 269
 270 struct linux_ebus *ebus_chain = NULL;
 271
 272 static inline void *ebus_alloc(size_t size)
 273 {
 274         void *mem;
 275
 276         mem = kzalloc(size, GFP_ATOMIC);
 277         if (!mem)
 278                 panic("ebus_alloc: out of memory");
 279         return mem;
 280 }
 281
 282 int __init ebus_intmap_match(struct linux_ebus *ebus,
 283                              struct linux_prom_registers *reg,
 284                              int *interrupt)
 285 {
 286         struct linux_prom_ebus_intmap *imap;
 287         struct linux_prom_ebus_intmask *imask;
 288         unsigned int hi, lo, irq;
 289         int i, len, n_imap;
 290
 291         imap = of_get_property(ebus->prom_node, "interrupt-map", &len);
 292         if (!imap)
 293                 return 0;
 294         n_imap = len / sizeof(imap[0]);
 295
 296         imask = of_get_property(ebus->prom_node, "interrupt-map-mask", NULL);
 297         if (!imask)
 298                 return 0;
 299
 300         hi = reg->which_io & imask->phys_hi;
 301         lo = reg->phys_addr & imask->phys_lo;
 302         irq = *interrupt & imask->interrupt;
 303         for (i = 0; i < n_imap; i++) {
 304                 if ((imap[i].phys_hi == hi) &&
 305                     (imap[i].phys_lo == lo) &&
 306                     (imap[i].interrupt == irq)) {
 307                         *interrupt = imap[i].cinterrupt;
 308                         return 0;
 309                 }
 310         }
 311         return -1;
 312 }
 313
 314 void __init fill_ebus_child(struct device_node *dp,
 315                             struct linux_prom_registers *preg,
 316                             struct linux_ebus_child *dev,
 317                             int non_standard_regs)
 318 {
 319         int *regs;
 320         int *irqs;
 321         int i, len;
 322
 323         dev->prom_node = dp;
 324         printk(" (%s)", dp->name);
 325
 326         regs = of_get_property(dp, "reg", &len);
 327         if (!regs)
 328                 dev->num_addrs = 0;
 329         else
 330                 dev->num_addrs = len / sizeof(regs[0]);
 331
 332         if (non_standard_regs) {
 333                 /* This is to handle reg properties which are not
 334                  * in the parent relative format.  One example are
 335                  * children of the i2c device on CompactPCI systems.
 336                  *
 337                  * So, for such devices we just record the property
 338                  * raw in the child resources.
 339                  */
 340                 for (i = 0; i < dev->num_addrs; i++)
 341                         dev->resource[i].start = regs[i];
 342         } else {
 343                 for (i = 0; i < dev->num_addrs; i++) {
 344                         int rnum = regs[i];
 345                         if (rnum >= dev->parent->num_addrs) {
 346                                 prom_printf("UGH: property for %s was %d, need < %d\n",
 347                                             dp->name, len, dev->parent->num_addrs);
 348                                 prom_halt();
 349                         }
 350                         dev->resource[i].start = dev->parent->resource[i].start;
 351                         dev->resource[i].end = dev->parent->resource[i].end;
 352                         dev->resource[i].flags = IORESOURCE_MEM;
 353                         dev->resource[i].name = dp->name;
 354                 }
 355         }
 356
 357         for (i = 0; i < PROMINTR_MAX; i++)
 358                 dev->irqs[i] = PCI_IRQ_NONE;
 359
 360         irqs = of_get_property(dp, "interrupts", &len);
 361         if (!irqs) {
 362                 dev->num_irqs = 0;
 363                 /*
 364                  * Oh, well, some PROMs don't export interrupts
 365                  * property to children of EBus devices...
 366                  *
 367                  * Be smart about PS/2 keyboard and mouse.
 368                  */
 369                 if (!strcmp(dev->parent->prom_node->name, "8042")) {
 370                         if (!strcmp(dev->prom_node->name, "kb_ps2")) {
 371                                 dev->num_irqs = 1;
 372                                 dev->irqs[0] = dev->parent->irqs[0];
 373                         } else {
 374                                 dev->num_irqs = 1;
 375                                 dev->irqs[0] = dev->parent->irqs[1];
 376                         }
 377                 }
 378         } else {
 379                 dev->num_irqs = len / sizeof(irqs[0]);
 380                 for (i = 0; i < dev->num_irqs; i++) {
 381                         struct pci_pbm_info *pbm = dev->bus->parent;
 382                         struct pci_controller_info *p = pbm->parent;
 383
 384                         if (ebus_intmap_match(dev->bus, preg, &irqs[i]) != -1) {
 385                                 dev->irqs[i] = p->irq_build(pbm,
 386                                                             dev->bus->self,
 387                                                             irqs[i]);
 388                         } else {
 389                                 /* If we get a bogus interrupt property, just
 390                                  * record the raw value instead of punting.
 391                                  */
 392                                 dev->irqs[i] = irqs[i];
 393                         }
 394                 }
 395         }
 396 }
 397
 398 static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
 399 {
 400         if (!strcmp(dev->prom_node->name, "i2c") ||
 401             !strcmp(dev->prom_node->name, "SUNW,lombus"))
 402                 return 1;
 403         return 0;
 404 }
 405
 406 void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
 407 {
 408         struct linux_prom_registers *regs;
 409         struct linux_ebus_child *child;
 410         int *irqs;
 411         int i, n, len;
 412
 413         dev->prom_node = dp;
 414
 415         printk(" [%s", dp->name);
 416
 417         regs = of_get_property(dp, "reg", &len);
 418         if (!regs) {
 419                 dev->num_addrs = 0;
 420                 goto probe_interrupts;
 421         }
 422
 423         if (len % sizeof(struct linux_prom_registers)) {
 424                 prom_printf("UGH: proplen for %s was %d, need multiple of %d\n",
 425                             dev->prom_node->name, len,
 426                             (int)sizeof(struct linux_prom_registers));
 427                 prom_halt();
 428         }
 429         dev->num_addrs = len / sizeof(struct linux_prom_registers);
 430
 431         for (i = 0; i < dev->num_addrs; i++) {
 432                 /* XXX Learn how to interpret ebus ranges... -DaveM */
 433                 if (regs[i].which_io >= 0x10)
 434                         n = (regs[i].which_io - 0x10) >> 2;
 435                 else
 436                         n = regs[i].which_io;
 437
 438                 dev->resource[i].start  = dev->bus->self->resource[n].start;
 439                 dev->resource[i].start += (unsigned long)regs[i].phys_addr;
 440                 dev->resource[i].end    =
 441                         (dev->resource[i].start + (unsigned long)regs[i].reg_size - 1UL);
 442                 dev->resource[i].flags  = IORESOURCE_MEM;
 443                 dev->resource[i].name   = dev->prom_node->name;
 444                 request_resource(&dev->bus->self->resource[n],
 445                                  &dev->resource[i]);
 446         }
 447
 448 probe_interrupts:
 449         for (i = 0; i < PROMINTR_MAX; i++)
 450                 dev->irqs[i] = PCI_IRQ_NONE;
 451
 452         irqs = of_get_property(dp, "interrupts", &len);
 453         if (!irqs) {
 454                 dev->num_irqs = 0;
 455         } else {
 456                 dev->num_irqs = len / sizeof(irqs[0]);
 457                 for (i = 0; i < dev->num_irqs; i++) {
 458                         struct pci_pbm_info *pbm = dev->bus->parent;
 459                         struct pci_controller_info *p = pbm->parent;
 460
 461                         if (ebus_intmap_match(dev->bus, &regs[0], &irqs[i]) != -1) {
 462                                 dev->irqs[i] = p->irq_build(pbm,
 463                                                             dev->bus->self,
 464                                                             irqs[i]);
 465                         } else {
 466                                 /* If we get a bogus interrupt property, just
 467                                  * record the raw value instead of punting.
 468                                  */
 469                                 dev->irqs[i] = irqs[i];
 470                         }
 471                 }
 472         }
 473
 474         dev->ofdev.node = dp;
 475         dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
 476         dev->ofdev.dev.bus = &ebus_bus_type;
 477         strcpy(dev->ofdev.dev.bus_id, dp->path_component_name);
 478
 479         /* Register with core */
 480         if (of_device_register(&dev->ofdev) != 0)
 481                 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 482                        dev->ofdev.dev.bus_id);
 483
 484         dp = dp->child;
 485         if (dp) {
 486                 printk(" ->");
 487                 dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
 488
 489                 child = dev->children;
 490                 child->next = NULL;
 491                 child->parent = dev;
 492                 child->bus = dev->bus;
 493                 fill_ebus_child(dp, regs, child,
 494                                 child_regs_nonstandard(dev));
 495
 496                 while ((dp = dp->sibling) != NULL) {
 497                         child->next = ebus_alloc(sizeof(struct linux_ebus_child));
 498
 499                         child = child->next;
 500                         child->next = NULL;
 501                         child->parent = dev;
 502                         child->bus = dev->bus;
 503                         fill_ebus_child(dp, regs, child,
 504                                         child_regs_nonstandard(dev));
 505                 }
 506         }
 507         printk("]");
 508 }
 509
 510 static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
 511 {
 512         struct pci_dev *pdev = start;
 513
 514         while ((pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev)))
 515                 if (pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
 516                         pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS)
 517                         break;
 518
 519         *is_rio_p = !!(pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS));
 520
 521         return pdev;
 522 }
 523
 524 void __init ebus_init(void)
 525 {
 526         struct pci_pbm_info *pbm;
 527         struct linux_ebus_device *dev;
 528         struct linux_ebus *ebus;
 529         struct pci_dev *pdev;
 530         struct pcidev_cookie *cookie;
 531         struct device_node *dp;
 532         int is_rio;
 533         int num_ebus = 0;
 534
 535         pdev = find_next_ebus(NULL, &is_rio);
 536         if (!pdev) {
 537                 printk("ebus: No EBus's found.\n");
 538                 return;
 539         }
 540
 541         cookie = pdev->sysdata;
 542         dp = cookie->prom_node;
 543
 544         ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
 545         ebus->next = NULL;
 546         ebus->is_rio = is_rio;
 547
 548         while (dp) {
 549                 struct device_node *child;
 550
 551                 /* SUNW,pci-qfe uses four empty ebuses on it.
 552                    I think we should not consider them here,
 553                    as they have half of the properties this
 554                    code expects and once we do PCI hot-plug,
 555                    we'd have to tweak with the ebus_chain
 556                    in the runtime after initialization. -jj */
 557                 if (!dp->child) {
 558                         pdev = find_next_ebus(pdev, &is_rio);
 559                         if (!pdev) {
 560                                 if (ebus == ebus_chain) {
 561                                         ebus_chain = NULL;
 562                                         printk("ebus: No EBus's found.\n");
 563                                         return;
 564                                 }
 565                                 break;
 566                         }
 567                         ebus->is_rio = is_rio;
 568                         cookie = pdev->sysdata;
 569                         dp = cookie->prom_node;
 570                         continue;
 571                 }
 572                 printk("ebus%d:", num_ebus);
 573
 574                 ebus->index = num_ebus;
 575                 ebus->prom_node = dp;
 576                 ebus->self = pdev;
 577                 ebus->parent = pbm = cookie->pbm;
 578
 579                 ebus->ofdev.node = dp;
 580                 ebus->ofdev.dev.parent = &pdev->dev;
 581                 ebus->ofdev.dev.bus = &ebus_bus_type;
 582                 strcpy(ebus->ofdev.dev.bus_id, dp->path_component_name);
 583
 584                 /* Register with core */
 585                 if (of_device_register(&ebus->ofdev) != 0)
 586                         printk(KERN_DEBUG "ebus: device registration error for %s!\n",
 587                                ebus->ofdev.dev.bus_id);
 588
 589
 590                 child = dp->child;
 591                 if (!child)
 592                         goto next_ebus;
 593
 594                 ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
 595
 596                 dev = ebus->devices;
 597                 dev->next = NULL;
 598                 dev->children = NULL;
 599                 dev->bus = ebus;
 600                 fill_ebus_device(child, dev);
 601
 602                 while ((child = child->sibling) != NULL) {
 603                         dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
 604
 605                         dev = dev->next;
 606                         dev->next = NULL;
 607                         dev->children = NULL;
 608                         dev->bus = ebus;
 609                         fill_ebus_device(child, dev);
 610                 }
 611
 612         next_ebus:
 613                 printk("\n");
 614
 615                 pdev = find_next_ebus(pdev, &is_rio);
 616                 if (!pdev)
 617                         break;
 618
 619                 cookie = pdev->sysdata;
 620                 dp = cookie->prom_node;
 621
 622                 ebus->next = ebus_alloc(sizeof(struct linux_ebus));
 623                 ebus = ebus->next;
 624                 ebus->next = NULL;
 625                 ebus->is_rio = is_rio;
 626                 ++num_ebus;
 627         }
 628         pci_dev_put(pdev); /* XXX for the case, when ebusnd is 0, is it OK? */
 629 }