arch/ia64/sn/pci/tioca_provider.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003-2005 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/pci.h>
  12 #include <linux/bitmap.h>
  13 #include <linux/slab.h>
  14 #include <asm/sn/sn_sal.h>
  15 #include <asm/sn/addrs.h>
  16 #include <asm/sn/io.h>
  17 #include <asm/sn/pcidev.h>
  18 #include <asm/sn/pcibus_provider_defs.h>
  19 #include <asm/sn/tioca_provider.h>
  20
  21 u32 tioca_gart_found;
  22 EXPORT_SYMBOL(tioca_gart_found);        /* used by agp-sgi */
  23
  24 LIST_HEAD(tioca_list);
  25 EXPORT_SYMBOL(tioca_list);      /* used by agp-sgi */
  26
  27 static int tioca_gart_init(struct tioca_kernel *);
  28
  29 /**
  30  * tioca_gart_init - Initialize SGI TIOCA GART
  31  * @tioca_common: ptr to common prom/kernel struct identifying the
  32  *
  33  * If the indicated tioca has devices present, initialize its associated
  34  * GART MMR's and kernel memory.
  35  */
  36 static int
  37 tioca_gart_init(struct tioca_kernel *tioca_kern)
  38 {
  39         u64 ap_reg;
  40         u64 offset;
  41         struct page *tmp;
  42         struct tioca_common *tioca_common;
  43         struct tioca __iomem *ca_base;
  44
  45         tioca_common = tioca_kern->ca_common;
  46         ca_base = (struct tioca __iomem *)tioca_common->ca_common.bs_base;
  47
  48         if (list_empty(tioca_kern->ca_devices))
  49                 return 0;
  50
  51         ap_reg = 0;
  52
  53         /*
  54          * Validate aperature size
  55          */
  56
  57         switch (CA_APERATURE_SIZE >> 20) {
  58         case 4:
  59                 ap_reg |= (0x3ff << CA_GART_AP_SIZE_SHFT);      /* 4MB */
  60                 break;
  61         case 8:
  62                 ap_reg |= (0x3fe << CA_GART_AP_SIZE_SHFT);      /* 8MB */
  63                 break;
  64         case 16:
  65                 ap_reg |= (0x3fc << CA_GART_AP_SIZE_SHFT);      /* 16MB */
  66                 break;
  67         case 32:
  68                 ap_reg |= (0x3f8 << CA_GART_AP_SIZE_SHFT);      /* 32 MB */
  69                 break;
  70         case 64:
  71                 ap_reg |= (0x3f0 << CA_GART_AP_SIZE_SHFT);      /* 64 MB */
  72                 break;
  73         case 128:
  74                 ap_reg |= (0x3e0 << CA_GART_AP_SIZE_SHFT);      /* 128 MB */
  75                 break;
  76         case 256:
  77                 ap_reg |= (0x3c0 << CA_GART_AP_SIZE_SHFT);      /* 256 MB */
  78                 break;
  79         case 512:
  80                 ap_reg |= (0x380 << CA_GART_AP_SIZE_SHFT);      /* 512 MB */
  81                 break;
  82         case 1024:
  83                 ap_reg |= (0x300 << CA_GART_AP_SIZE_SHFT);      /* 1GB */
  84                 break;
  85         case 2048:
  86                 ap_reg |= (0x200 << CA_GART_AP_SIZE_SHFT);      /* 2GB */
  87                 break;
  88         case 4096:
  89                 ap_reg |= (0x000 << CA_GART_AP_SIZE_SHFT);      /* 4 GB */
  90                 break;
  91         default:
  92                 printk(KERN_ERR "%s:  Invalid CA_APERATURE_SIZE "
  93                        "0x%lx\n", __func__, (ulong) CA_APERATURE_SIZE);
  94                 return -1;
  95         }
  96
  97         /*
  98          * Set up other aperature parameters
  99          */
 100
 101         if (PAGE_SIZE >= 16384) {
 102                 tioca_kern->ca_ap_pagesize = 16384;
 103                 ap_reg |= CA_GART_PAGE_SIZE;
 104         } else {
 105                 tioca_kern->ca_ap_pagesize = 4096;
 106         }
 107
 108         tioca_kern->ca_ap_size = CA_APERATURE_SIZE;
 109         tioca_kern->ca_ap_bus_base = CA_APERATURE_BASE;
 110         tioca_kern->ca_gart_entries =
 111             tioca_kern->ca_ap_size / tioca_kern->ca_ap_pagesize;
 112
 113         ap_reg |= (CA_GART_AP_ENB_AGP | CA_GART_AP_ENB_PCI);
 114         ap_reg |= tioca_kern->ca_ap_bus_base;
 115
 116         /*
 117          * Allocate and set up the GART
 118          */
 119
 120         tioca_kern->ca_gart_size = tioca_kern->ca_gart_entries * sizeof(u64);
 121         tmp =
 122             alloc_pages_node(tioca_kern->ca_closest_node,
 123                              GFP_KERNEL | __GFP_ZERO,
 124                              get_order(tioca_kern->ca_gart_size));
 125
 126         if (!tmp) {
 127                 printk(KERN_ERR "%s:  Could not allocate "
 128                        "%llu bytes (order %d) for GART\n",
 129                        __func__,
 130                        tioca_kern->ca_gart_size,
 131                        get_order(tioca_kern->ca_gart_size));
 132                 return -ENOMEM;
 133         }
 134
 135         tioca_kern->ca_gart = page_address(tmp);
 136         tioca_kern->ca_gart_coretalk_addr =
 137             PHYS_TO_TIODMA(virt_to_phys(tioca_kern->ca_gart));
 138
 139         /*
 140          * Compute PCI/AGP convenience fields
 141          */
 142
 143         offset = CA_PCI32_MAPPED_BASE - CA_APERATURE_BASE;
 144         tioca_kern->ca_pciap_base = CA_PCI32_MAPPED_BASE;
 145         tioca_kern->ca_pciap_size = CA_PCI32_MAPPED_SIZE;
 146         tioca_kern->ca_pcigart_start = offset / tioca_kern->ca_ap_pagesize;
 147         tioca_kern->ca_pcigart_base =
 148             tioca_kern->ca_gart_coretalk_addr + offset;
 149         tioca_kern->ca_pcigart =
 150             &tioca_kern->ca_gart[tioca_kern->ca_pcigart_start];
 151         tioca_kern->ca_pcigart_entries =
 152             tioca_kern->ca_pciap_size / tioca_kern->ca_ap_pagesize;
 153         tioca_kern->ca_pcigart_pagemap =
 154             kzalloc(tioca_kern->ca_pcigart_entries / 8, GFP_KERNEL);
 155         if (!tioca_kern->ca_pcigart_pagemap) {
 156                 free_pages((unsigned long)tioca_kern->ca_gart,
 157                            get_order(tioca_kern->ca_gart_size));
 158                 return -1;
 159         }
 160
 161         offset = CA_AGP_MAPPED_BASE - CA_APERATURE_BASE;
 162         tioca_kern->ca_gfxap_base = CA_AGP_MAPPED_BASE;
 163         tioca_kern->ca_gfxap_size = CA_AGP_MAPPED_SIZE;
 164         tioca_kern->ca_gfxgart_start = offset / tioca_kern->ca_ap_pagesize;
 165         tioca_kern->ca_gfxgart_base =
 166             tioca_kern->ca_gart_coretalk_addr + offset;
 167         tioca_kern->ca_gfxgart =
 168             &tioca_kern->ca_gart[tioca_kern->ca_gfxgart_start];
 169         tioca_kern->ca_gfxgart_entries =
 170             tioca_kern->ca_gfxap_size / tioca_kern->ca_ap_pagesize;
 171
 172         /*
 173          * various control settings:
 174          *      use agp op-combining
 175          *      use GET semantics to fetch memory
 176          *      participate in coherency domain
 177          *      DISABLE GART PREFETCHING due to hw bug tracked in SGI PV930029
 178          */
 179
 180         __sn_setq_relaxed(&ca_base->ca_control1,
 181                         CA_AGPDMA_OP_ENB_COMBDELAY);    /* PV895469 ? */
 182         __sn_clrq_relaxed(&ca_base->ca_control2, CA_GART_MEM_PARAM);
 183         __sn_setq_relaxed(&ca_base->ca_control2,
 184                         (0x2ull << CA_GART_MEM_PARAM_SHFT));
 185         tioca_kern->ca_gart_iscoherent = 1;
 186         __sn_clrq_relaxed(&ca_base->ca_control2,
 187                         (CA_GART_WR_PREFETCH_ENB | CA_GART_RD_PREFETCH_ENB));
 188
 189         /*
 190          * Unmask GART fetch error interrupts.  Clear residual errors first.
 191          */
 192
 193         writeq(CA_GART_FETCH_ERR, &ca_base->ca_int_status_alias);
 194         writeq(CA_GART_FETCH_ERR, &ca_base->ca_mult_error_alias);
 195         __sn_clrq_relaxed(&ca_base->ca_int_mask, CA_GART_FETCH_ERR);
 196
 197         /*
 198          * Program the aperature and gart registers in TIOCA
 199          */
 200
 201         writeq(ap_reg, &ca_base->ca_gart_aperature);
 202         writeq(tioca_kern->ca_gart_coretalk_addr|1, &ca_base->ca_gart_ptr_table);
 203
 204         return 0;
 205 }
 206
 207 /**
 208  * tioca_fastwrite_enable - enable AGP FW for a tioca and its functions
 209  * @tioca_kernel: structure representing the CA
 210  *
 211  * Given a CA, scan all attached functions making sure they all support
 212  * FastWrite.  If so, enable FastWrite for all functions and the CA itself.
 213  */
 214
 215 void
 216 tioca_fastwrite_enable(struct tioca_kernel *tioca_kern)
 217 {
 218         int cap_ptr;
 219         u32 reg;
 220         struct tioca __iomem *tioca_base;
 221         struct pci_dev *pdev;
 222         struct tioca_common *common;
 223
 224         common = tioca_kern->ca_common;
 225
 226         /*
 227          * Scan all vga controllers on this bus making sure they all
 228          * support FW.  If not, return.
 229          */
 230
 231         list_for_each_entry(pdev, tioca_kern->ca_devices, bus_list) {
 232                 if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8))
 233                         continue;
 234
 235                 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 236                 if (!cap_ptr)
 237                         return; /* no AGP CAP means no FW */
 238
 239                 pci_read_config_dword(pdev, cap_ptr + PCI_AGP_STATUS, &reg);
 240                 if (!(reg & PCI_AGP_STATUS_FW))
 241                         return; /* function doesn't support FW */
 242         }
 243
 244         /*
 245          * Set fw for all vga fn's
 246          */
 247
 248         list_for_each_entry(pdev, tioca_kern->ca_devices, bus_list) {
 249                 if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8))
 250                         continue;
 251
 252                 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 253                 pci_read_config_dword(pdev, cap_ptr + PCI_AGP_COMMAND, &reg);
 254                 reg |= PCI_AGP_COMMAND_FW;
 255                 pci_write_config_dword(pdev, cap_ptr + PCI_AGP_COMMAND, reg);
 256         }
 257
 258         /*
 259          * Set ca's fw to match
 260          */
 261
 262         tioca_base = (struct tioca __iomem*)common->ca_common.bs_base;
 263         __sn_setq_relaxed(&tioca_base->ca_control1, CA_AGP_FW_ENABLE);
 264 }
 265
 266 EXPORT_SYMBOL(tioca_fastwrite_enable);  /* used by agp-sgi */
 267
 268 /**
 269  * tioca_dma_d64 - create a DMA mapping using 64-bit direct mode
 270  * @paddr: system physical address
 271  *
 272  * Map @paddr into 64-bit CA bus space.  No device context is necessary.
 273  * Bits 53:0 come from the coretalk address.  We just need to mask in the
 274  * following optional bits of the 64-bit pci address:
 275  *
 276  * 63:60 - Coretalk Packet Type -  0x1 for Mem Get/Put (coherent)
 277  *                                 0x2 for PIO (non-coherent)
 278  *                                 We will always use 0x1
 279  * 55:55 - Swap bytes              Currently unused
 280  */
 281 static u64
 282 tioca_dma_d64(unsigned long paddr)
 283 {
 284         dma_addr_t bus_addr;
 285
 286         bus_addr = PHYS_TO_TIODMA(paddr);
 287
 288         BUG_ON(!bus_addr);
 289         BUG_ON(bus_addr >> 54);
 290
 291         /* Set upper nibble to Cache Coherent Memory op */
 292         bus_addr |= (1UL << 60);
 293
 294         return bus_addr;
 295 }
 296
 297 /**
 298  * tioca_dma_d48 - create a DMA mapping using 48-bit direct mode
 299  * @pdev: linux pci_dev representing the function
 300  * @paddr: system physical address
 301  *
 302  * Map @paddr into 64-bit bus space of the CA associated with @pcidev_info.
 303  *
 304  * The CA agp 48 bit direct address falls out as follows:
 305  *
 306  * When direct mapping AGP addresses, the 48 bit AGP address is
 307  * constructed as follows:
 308  *
 309  * [47:40] - Low 8 bits of the page Node ID extracted from coretalk
 310  *              address [47:40].  The upper 8 node bits are fixed
 311  *              and come from the xxx register bits [5:0]
 312  * [39:38] - Chiplet ID extracted from coretalk address [39:38]
 313  * [37:00] - node offset extracted from coretalk address [37:00]
 314  *
 315  * Since the node id in general will be non-zero, and the chiplet id
 316  * will always be non-zero, it follows that the device must support
 317  * a dma mask of at least 0xffffffffff (40 bits) to target node 0
 318  * and in general should be 0xffffffffffff (48 bits) to target nodes
 319  * up to 255.  Nodes above 255 need the support of the xxx register,
 320  * and so a given CA can only directly target nodes in the range
 321  * xxx - xxx+255.
 322  */
 323 static u64
 324 tioca_dma_d48(struct pci_dev *pdev, u64 paddr)
 325 {
 326         struct tioca_common *tioca_common;
 327         struct tioca __iomem *ca_base;
 328         u64 ct_addr;
 329         dma_addr_t bus_addr;
 330         u32 node_upper;
 331         u64 agp_dma_extn;
 332         struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(pdev);
 333
 334         tioca_common = (struct tioca_common *)pcidev_info->pdi_pcibus_info;
 335         ca_base = (struct tioca __iomem *)tioca_common->ca_common.bs_base;
 336
 337         ct_addr = PHYS_TO_TIODMA(paddr);
 338         if (!ct_addr)
 339                 return 0;
 340
 341         bus_addr = (dma_addr_t) (ct_addr & 0xffffffffffffUL);
 342         node_upper = ct_addr >> 48;
 343
 344         if (node_upper > 64) {
 345                 printk(KERN_ERR "%s:  coretalk addr 0x%p node id out "
 346                        "of range\n", __func__, (void *)ct_addr);
 347                 return 0;
 348         }
 349
 350         agp_dma_extn = __sn_readq_relaxed(&ca_base->ca_agp_dma_addr_extn);
 351         if (node_upper != (agp_dma_extn >> CA_AGP_DMA_NODE_ID_SHFT)) {
 352                 printk(KERN_ERR "%s:  coretalk upper node (%u) "
 353                        "mismatch with ca_agp_dma_addr_extn (%llu)\n",
 354                        __func__,
 355                        node_upper, (agp_dma_extn >> CA_AGP_DMA_NODE_ID_SHFT));
 356                 return 0;
 357         }
 358
 359         return bus_addr;
 360 }
 361
 362 /**
 363  * tioca_dma_mapped - create a DMA mapping using a CA GART
 364  * @pdev: linux pci_dev representing the function
 365  * @paddr: host physical address to map
 366  * @req_size: len (bytes) to map
 367  *
 368  * Map @paddr into CA address space using the GART mechanism.  The mapped
 369  * dma_addr_t is guaranteed to be contiguous in CA bus space.
 370  */
 371 static dma_addr_t
 372 tioca_dma_mapped(struct pci_dev *pdev, unsigned long paddr, size_t req_size)
 373 {
 374         int ps, ps_shift, entry, entries, mapsize;
 375         u64 xio_addr, end_xio_addr;
 376         struct tioca_common *tioca_common;
 377         struct tioca_kernel *tioca_kern;
 378         dma_addr_t bus_addr = 0;
 379         struct tioca_dmamap *ca_dmamap;
 380         void *map;
 381         unsigned long flags;
 382         struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(pdev);
 383
 384         tioca_common = (struct tioca_common *)pcidev_info->pdi_pcibus_info;
 385         tioca_kern = (struct tioca_kernel *)tioca_common->ca_kernel_private;
 386
 387         xio_addr = PHYS_TO_TIODMA(paddr);
 388         if (!xio_addr)
 389                 return 0;
 390
 391         spin_lock_irqsave(&tioca_kern->ca_lock, flags);
 392
 393         /*
 394          * allocate a map struct
 395          */
 396
 397         ca_dmamap = kzalloc(sizeof(struct tioca_dmamap), GFP_ATOMIC);
 398         if (!ca_dmamap)
 399                 goto map_return;
 400
 401         /*
 402          * Locate free entries that can hold req_size.  Account for
 403          * unaligned start/length when allocating.
 404          */
 405
 406         ps = tioca_kern->ca_ap_pagesize;        /* will be power of 2 */
 407         ps_shift = ffs(ps) - 1;
 408         end_xio_addr = xio_addr + req_size - 1;
 409
 410         entries = (end_xio_addr >> ps_shift) - (xio_addr >> ps_shift) + 1;
 411
 412         map = tioca_kern->ca_pcigart_pagemap;
 413         mapsize = tioca_kern->ca_pcigart_entries;
 414
 415         entry = bitmap_find_next_zero_area(map, mapsize, 0, entries, 0);
 416         if (entry >= mapsize) {
 417                 kfree(ca_dmamap);
 418                 goto map_return;
 419         }
 420
 421         bitmap_set(map, entry, entries);
 422
 423         bus_addr = tioca_kern->ca_pciap_base + (entry * ps);
 424
 425         ca_dmamap->cad_dma_addr = bus_addr;
 426         ca_dmamap->cad_gart_size = entries;
 427         ca_dmamap->cad_gart_entry = entry;
 428         list_add(&ca_dmamap->cad_list, &tioca_kern->ca_dmamaps);
 429
 430         if (xio_addr % ps) {
 431                 tioca_kern->ca_pcigart[entry] = tioca_paddr_to_gart(xio_addr);
 432                 bus_addr += xio_addr & (ps - 1);
 433                 xio_addr &= ~(ps - 1);
 434                 xio_addr += ps;
 435                 entry++;
 436         }
 437
 438         while (xio_addr < end_xio_addr) {
 439                 tioca_kern->ca_pcigart[entry] = tioca_paddr_to_gart(xio_addr);
 440                 xio_addr += ps;
 441                 entry++;
 442         }
 443
 444         tioca_tlbflush(tioca_kern);
 445
 446 map_return:
 447         spin_unlock_irqrestore(&tioca_kern->ca_lock, flags);
 448         return bus_addr;
 449 }
 450
 451 /**
 452  * tioca_dma_unmap - release CA mapping resources
 453  * @pdev: linux pci_dev representing the function
 454  * @bus_addr: bus address returned by an earlier tioca_dma_map
 455  * @dir: mapping direction (unused)
 456  *
 457  * Locate mapping resources associated with @bus_addr and release them.
 458  * For mappings created using the direct modes (64 or 48) there are no
 459  * resources to release.
 460  */
 461 static void
 462 tioca_dma_unmap(struct pci_dev *pdev, dma_addr_t bus_addr, int dir)
 463 {
 464         int i, entry;
 465         struct tioca_common *tioca_common;
 466         struct tioca_kernel *tioca_kern;
 467         struct tioca_dmamap *map;
 468         struct pcidev_info *pcidev_info = SN_PCIDEV_INFO(pdev);
 469         unsigned long flags;
 470
 471         tioca_common = (struct tioca_common *)pcidev_info->pdi_pcibus_info;
 472         tioca_kern = (struct tioca_kernel *)tioca_common->ca_kernel_private;
 473
 474         /* return straight away if this isn't be a mapped address */
 475
 476         if (bus_addr < tioca_kern->ca_pciap_base ||
 477             bus_addr >= (tioca_kern->ca_pciap_base + tioca_kern->ca_pciap_size))
 478                 return;
 479
 480         spin_lock_irqsave(&tioca_kern->ca_lock, flags);
 481
 482         list_for_each_entry(map, &tioca_kern->ca_dmamaps, cad_list)
 483             if (map->cad_dma_addr == bus_addr)
 484                 break;
 485
 486         BUG_ON(map == NULL);
 487
 488         entry = map->cad_gart_entry;
 489
 490         for (i = 0; i < map->cad_gart_size; i++, entry++) {
 491                 clear_bit(entry, tioca_kern->ca_pcigart_pagemap);
 492                 tioca_kern->ca_pcigart[entry] = 0;
 493         }
 494         tioca_tlbflush(tioca_kern);
 495
 496         list_del(&map->cad_list);
 497         spin_unlock_irqrestore(&tioca_kern->ca_lock, flags);
 498         kfree(map);
 499 }
 500
 501 /**
 502  * tioca_dma_map - map pages for PCI DMA
 503  * @pdev: linux pci_dev representing the function
 504  * @paddr: host physical address to map
 505  * @byte_count: bytes to map
 506  *
 507  * This is the main wrapper for mapping host physical pages to CA PCI space.
 508  * The mapping mode used is based on the devices dma_mask.  As a last resort
 509  * use the GART mapped mode.
 510  */
 511 static u64
 512 tioca_dma_map(struct pci_dev *pdev, unsigned long paddr, size_t byte_count, int dma_flags)
 513 {
 514         u64 mapaddr;
 515
 516         /*
 517          * Not supported for now ...
 518          */
 519         if (dma_flags & SN_DMA_MSI)
 520                 return 0;
 521
 522         /*
 523          * If card is 64 or 48 bit addressable, use a direct mapping.  32
 524          * bit direct is so restrictive w.r.t. where the memory resides that
 525          * we don't use it even though CA has some support.
 526          */
 527
 528         if (pdev->dma_mask == ~0UL)
 529                 mapaddr = tioca_dma_d64(paddr);
 530         else if (pdev->dma_mask == 0xffffffffffffUL)
 531                 mapaddr = tioca_dma_d48(pdev, paddr);
 532         else
 533                 mapaddr = 0;
 534
 535         /* Last resort ... use PCI portion of CA GART */
 536
 537         if (mapaddr == 0)
 538                 mapaddr = tioca_dma_mapped(pdev, paddr, byte_count);
 539
 540         return mapaddr;
 541 }
 542
 543 /**
 544  * tioca_error_intr_handler - SGI TIO CA error interrupt handler
 545  * @irq: unused
 546  * @arg: pointer to tioca_common struct for the given CA
 547  *
 548  * Handle a CA error interrupt.  Simply a wrapper around a SAL call which
 549  * defers processing to the SGI prom.
 550  */
 551 static irqreturn_t
 552 tioca_error_intr_handler(int irq, void *arg)
 553 {
 554         struct tioca_common *soft = arg;
 555         struct ia64_sal_retval ret_stuff;
 556         u64 segment;
 557         u64 busnum;
 558         ret_stuff.status = 0;
 559         ret_stuff.v0 = 0;
 560
 561         segment = soft->ca_common.bs_persist_segment;
 562         busnum = soft->ca_common.bs_persist_busnum;
 563
 564         SAL_CALL_NOLOCK(ret_stuff,
 565                         (u64) SN_SAL_IOIF_ERROR_INTERRUPT,
 566                         segment, busnum, 0, 0, 0, 0, 0);
 567
 568         return IRQ_HANDLED;
 569 }
 570
 571 /**
 572  * tioca_bus_fixup - perform final PCI fixup for a TIO CA bus
 573  * @prom_bussoft: Common prom/kernel struct representing the bus
 574  *
 575  * Replicates the tioca_common pointed to by @prom_bussoft in kernel
 576  * space.  Allocates and initializes a kernel-only area for a given CA,
 577  * and sets up an irq for handling CA error interrupts.
 578  *
 579  * On successful setup, returns the kernel version of tioca_common back to
 580  * the caller.
 581  */
 582 static void *
 583 tioca_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *controller)
 584 {
 585         struct tioca_common *tioca_common;
 586         struct tioca_kernel *tioca_kern;
 587         struct pci_bus *bus;
 588
 589         /* sanity check prom rev */
 590
 591         if (is_shub1() && sn_sal_rev() < 0x0406) {
 592                 printk
 593                     (KERN_ERR "%s:  SGI prom rev 4.06 or greater required "
 594                      "for tioca support\n", __func__);
 595                 return NULL;
 596         }
 597
 598         /*
 599          * Allocate kernel bus soft and copy from prom.
 600          */
 601
 602         tioca_common = kzalloc(sizeof(struct tioca_common), GFP_KERNEL);
 603         if (!tioca_common)
 604                 return NULL;
 605
 606         memcpy(tioca_common, prom_bussoft, sizeof(struct tioca_common));
 607         tioca_common->ca_common.bs_base = (unsigned long)
 608                 ioremap(REGION_OFFSET(tioca_common->ca_common.bs_base),
 609                         sizeof(struct tioca_common));
 610
 611         /* init kernel-private area */
 612
 613         tioca_kern = kzalloc(sizeof(struct tioca_kernel), GFP_KERNEL);
 614         if (!tioca_kern) {
 615                 kfree(tioca_common);
 616                 return NULL;
 617         }
 618
 619         tioca_kern->ca_common = tioca_common;
 620         spin_lock_init(&tioca_kern->ca_lock);
 621         INIT_LIST_HEAD(&tioca_kern->ca_dmamaps);
 622         tioca_kern->ca_closest_node =
 623             nasid_to_cnodeid(tioca_common->ca_closest_nasid);
 624         tioca_common->ca_kernel_private = (u64) tioca_kern;
 625
 626         bus = pci_find_bus(tioca_common->ca_common.bs_persist_segment,
 627                 tioca_common->ca_common.bs_persist_busnum);
 628         BUG_ON(!bus);
 629         tioca_kern->ca_devices = &bus->devices;
 630
 631         /* init GART */
 632
 633         if (tioca_gart_init(tioca_kern) < 0) {
 634                 kfree(tioca_kern);
 635                 kfree(tioca_common);
 636                 return NULL;
 637         }
 638
 639         tioca_gart_found++;
 640         list_add(&tioca_kern->ca_list, &tioca_list);
 641
 642         if (request_irq(SGI_TIOCA_ERROR,
 643                         tioca_error_intr_handler,
 644                         IRQF_SHARED, "TIOCA error", (void *)tioca_common))
 645                 printk(KERN_WARNING
 646                        "%s:  Unable to get irq %d.  "
 647                        "Error interrupts won't be routed for TIOCA bus %d\n",
 648                        __func__, SGI_TIOCA_ERROR,
 649                        (int)tioca_common->ca_common.bs_persist_busnum);
 650
 651         sn_set_err_irq_affinity(SGI_TIOCA_ERROR);
 652
 653         /* Setup locality information */
 654         controller->node = tioca_kern->ca_closest_node;
 655         return tioca_common;
 656 }
 657
 658 static struct sn_pcibus_provider tioca_pci_interfaces = {
 659         .dma_map = tioca_dma_map,
 660         .dma_map_consistent = tioca_dma_map,
 661         .dma_unmap = tioca_dma_unmap,
 662         .bus_fixup = tioca_bus_fixup,
 663         .force_interrupt = NULL,
 664         .target_interrupt = NULL
 665 };
 666
 667 /**
 668  * tioca_init_provider - init SN PCI provider ops for TIO CA
 669  */
 670 int
 671 tioca_init_provider(void)
 672 {
 673         sn_pci_provider[PCIIO_ASIC_TYPE_TIOCA] = &tioca_pci_interfaces;
 674         return 0;
 675 }