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   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) 2006 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #include <asm/sn/types.h>
  10 #include <asm/sn/addrs.h>
  11 #include <asm/sn/pcidev.h>
  12 #include <asm/sn/pcibus_provider_defs.h>
  13 #include <asm/sn/sn_sal.h>
  14 #include "xtalk/hubdev.h"
  15 #include <linux/acpi.h>
  16
  17
  18 /*
  19  * The code in this file will only be executed when running with
  20  * a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
  21  */
  22
  23
  24 /*
  25  * This value must match the UUID the PROM uses
  26  * (io/acpi/defblk.c) when building a vendor descriptor.
  27  */
  28 struct acpi_vendor_uuid sn_uuid = {
  29         .subtype = 0,
  30         .data   = { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
  31                     0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
  32 };
  33
  34 struct sn_pcidev_match {
  35         u8 bus;
  36         unsigned int devfn;
  37         acpi_handle handle;
  38 };
  39
  40 /*
  41  * Perform the early IO init in PROM.
  42  */
  43 static s64
  44 sal_ioif_init(u64 *result)
  45 {
  46         struct ia64_sal_retval isrv = {0,0,0,0};
  47
  48         SAL_CALL_NOLOCK(isrv,
  49                         SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
  50         *result = isrv.v0;
  51         return isrv.status;
  52 }
  53
  54 /*
  55  * sn_acpi_hubdev_init() - This function is called by acpi_ns_get_device_callback()
  56  *                         for all SGIHUB and SGITIO acpi devices defined in the
  57  *                         DSDT. It obtains the hubdev_info pointer from the
  58  *                         ACPI vendor resource, which the PROM setup, and sets up the
  59  *                         hubdev_info in the pda.
  60  */
  61
  62 static acpi_status __init
  63 sn_acpi_hubdev_init(acpi_handle handle, u32 depth, void *context, void **ret)
  64 {
  65         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  66         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  67         u64 addr;
  68         struct hubdev_info *hubdev;
  69         struct hubdev_info *hubdev_ptr;
  70         int i;
  71         u64 nasid;
  72         struct acpi_resource *resource;
  73         acpi_status status;
  74         struct acpi_resource_vendor_typed *vendor;
  75         extern void sn_common_hubdev_init(struct hubdev_info *);
  76
  77         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
  78                                           &sn_uuid, &buffer);
  79         if (ACPI_FAILURE(status)) {
  80                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
  81                 printk(KERN_ERR
  82                        "sn_acpi_hubdev_init: acpi_get_vendor_resource() "
  83                        "(0x%x) failed for: %s\n", status,
  84                         (char *)name_buffer.pointer);
  85                 kfree(name_buffer.pointer);
  86                 return AE_OK;           /* Continue walking namespace */
  87         }
  88
  89         resource = buffer.pointer;
  90         vendor = &resource->data.vendor_typed;
  91         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
  92             sizeof(struct hubdev_info *)) {
  93                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
  94                 printk(KERN_ERR
  95                        "sn_acpi_hubdev_init: Invalid vendor data length: "
  96                        "%d for: %s\n",
  97                         vendor->byte_length, (char *)name_buffer.pointer);
  98                 kfree(name_buffer.pointer);
  99                 goto exit;
 100         }
 101
 102         memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
 103         hubdev_ptr = __va((struct hubdev_info *) addr);
 104
 105         nasid = hubdev_ptr->hdi_nasid;
 106         i = nasid_to_cnodeid(nasid);
 107         hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
 108         *hubdev = *hubdev_ptr;
 109         sn_common_hubdev_init(hubdev);
 110
 111 exit:
 112         kfree(buffer.pointer);
 113         return AE_OK;           /* Continue walking namespace */
 114 }
 115
 116 /*
 117  * sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
 118  *                        the ACPI Vendor resource for this bus.
 119  */
 120 static struct pcibus_bussoft *
 121 sn_get_bussoft_ptr(struct pci_bus *bus)
 122 {
 123         u64 addr;
 124         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 125         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 126         acpi_handle handle;
 127         struct pcibus_bussoft *prom_bussoft_ptr;
 128         struct acpi_resource *resource;
 129         acpi_status status;
 130         struct acpi_resource_vendor_typed *vendor;
 131
 132
 133         handle = PCI_CONTROLLER(bus)->acpi_handle;
 134         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 135                                           &sn_uuid, &buffer);
 136         if (ACPI_FAILURE(status)) {
 137                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
 138                 printk(KERN_ERR "%s: "
 139                        "acpi_get_vendor_resource() failed (0x%x) for: %s\n",
 140                        __func__, status, (char *)name_buffer.pointer);
 141                 kfree(name_buffer.pointer);
 142                 return NULL;
 143         }
 144         resource = buffer.pointer;
 145         vendor = &resource->data.vendor_typed;
 146
 147         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 148              sizeof(struct pcibus_bussoft *)) {
 149                 printk(KERN_ERR
 150                        "%s: Invalid vendor data length %d\n",
 151                         __func__, vendor->byte_length);
 152                 kfree(buffer.pointer);
 153                 return NULL;
 154         }
 155         memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
 156         prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
 157         kfree(buffer.pointer);
 158
 159         return prom_bussoft_ptr;
 160 }
 161
 162 /*
 163  * sn_extract_device_info - Extract the pcidev_info and the sn_irq_info
 164  *                          pointers from the vendor resource using the
 165  *                          provided acpi handle, and copy the structures
 166  *                          into the argument buffers.
 167  */
 168 static int
 169 sn_extract_device_info(acpi_handle handle, struct pcidev_info **pcidev_info,
 170                     struct sn_irq_info **sn_irq_info)
 171 {
 172         u64 addr;
 173         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 174         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 175         struct sn_irq_info *irq_info, *irq_info_prom;
 176         struct pcidev_info *pcidev_ptr, *pcidev_prom_ptr;
 177         struct acpi_resource *resource;
 178         int ret = 0;
 179         acpi_status status;
 180         struct acpi_resource_vendor_typed *vendor;
 181
 182         /*
 183          * The pointer to this device's pcidev_info structure in
 184          * the PROM, is in the vendor resource.
 185          */
 186         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 187                                           &sn_uuid, &buffer);
 188         if (ACPI_FAILURE(status)) {
 189                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
 190                 printk(KERN_ERR
 191                        "%s: acpi_get_vendor_resource() failed (0x%x) for: %s\n",
 192                         __func__, status, (char *)name_buffer.pointer);
 193                 kfree(name_buffer.pointer);
 194                 return 1;
 195         }
 196
 197         resource = buffer.pointer;
 198         vendor = &resource->data.vendor_typed;
 199         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 200             sizeof(struct pci_devdev_info *)) {
 201                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
 202                 printk(KERN_ERR
 203                        "%s: Invalid vendor data length: %d for: %s\n",
 204                          __func__, vendor->byte_length,
 205                         (char *)name_buffer.pointer);
 206                 kfree(name_buffer.pointer);
 207                 ret = 1;
 208                 goto exit;
 209         }
 210
 211         pcidev_ptr = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 212         if (!pcidev_ptr)
 213                 panic("%s: Unable to alloc memory for pcidev_info", __func__);
 214
 215         memcpy(&addr, vendor->byte_data, sizeof(struct pcidev_info *));
 216         pcidev_prom_ptr = __va(addr);
 217         memcpy(pcidev_ptr, pcidev_prom_ptr, sizeof(struct pcidev_info));
 218
 219         /* Get the IRQ info */
 220         irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 221         if (!irq_info)
 222                  panic("%s: Unable to alloc memory for sn_irq_info", __func__);
 223
 224         if (pcidev_ptr->pdi_sn_irq_info) {
 225                 irq_info_prom = __va(pcidev_ptr->pdi_sn_irq_info);
 226                 memcpy(irq_info, irq_info_prom, sizeof(struct sn_irq_info));
 227         }
 228
 229         *pcidev_info = pcidev_ptr;
 230         *sn_irq_info = irq_info;
 231
 232 exit:
 233         kfree(buffer.pointer);
 234         return ret;
 235 }
 236
 237 static unsigned int
 238 get_host_devfn(acpi_handle device_handle, acpi_handle rootbus_handle)
 239 {
 240         unsigned long long adr;
 241         acpi_handle child;
 242         unsigned int devfn;
 243         int function;
 244         acpi_handle parent;
 245         int slot;
 246         acpi_status status;
 247         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 248
 249         acpi_get_name(device_handle, ACPI_FULL_PATHNAME, &name_buffer);
 250
 251         /*
 252          * Do an upward search to find the root bus device, and
 253          * obtain the host devfn from the previous child device.
 254          */
 255         child = device_handle;
 256         while (child) {
 257                 status = acpi_get_parent(child, &parent);
 258                 if (ACPI_FAILURE(status)) {
 259                         printk(KERN_ERR "%s: acpi_get_parent() failed "
 260                                "(0x%x) for: %s\n", __func__, status,
 261                                 (char *)name_buffer.pointer);
 262                         panic("%s: Unable to find host devfn\n", __func__);
 263                 }
 264                 if (parent == rootbus_handle)
 265                         break;
 266                 child = parent;
 267         }
 268         if (!child) {
 269                 printk(KERN_ERR "%s: Unable to find root bus for: %s\n",
 270                        __func__, (char *)name_buffer.pointer);
 271                 BUG();
 272         }
 273
 274         status = acpi_evaluate_integer(child, METHOD_NAME__ADR, NULL, &adr);
 275         if (ACPI_FAILURE(status)) {
 276                 printk(KERN_ERR "%s: Unable to get _ADR (0x%x) for: %s\n",
 277                        __func__, status, (char *)name_buffer.pointer);
 278                 panic("%s: Unable to find host devfn\n", __func__);
 279         }
 280
 281         kfree(name_buffer.pointer);
 282
 283         slot = (adr >> 16) & 0xffff;
 284         function = adr & 0xffff;
 285         devfn = PCI_DEVFN(slot, function);
 286         return devfn;
 287 }
 288
 289 /*
 290  * find_matching_device - Callback routine to find the ACPI device
 291  *                        that matches up with our pci_dev device.
 292  *                        Matching is done on bus number and devfn.
 293  *                        To find the bus number for a particular
 294  *                        ACPI device, we must look at the _BBN method
 295  *                        of its parent.
 296  */
 297 static acpi_status
 298 find_matching_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 299 {
 300         unsigned long long bbn = -1;
 301         unsigned long long adr;
 302         acpi_handle parent = NULL;
 303         acpi_status status;
 304         unsigned int devfn;
 305         int function;
 306         int slot;
 307         struct sn_pcidev_match *info = context;
 308         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 309
 310         status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 311                                        &adr);
 312         if (ACPI_SUCCESS(status)) {
 313                 status = acpi_get_parent(handle, &parent);
 314                 if (ACPI_FAILURE(status)) {
 315                         acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
 316                         printk(KERN_ERR
 317                                "%s: acpi_get_parent() failed (0x%x) for: %s\n",
 318                                 __func__, status, (char *)name_buffer.pointer);
 319                         kfree(name_buffer.pointer);
 320                         return AE_OK;
 321                 }
 322                 status = acpi_evaluate_integer(parent, METHOD_NAME__BBN,
 323                                                NULL, &bbn);
 324                 if (ACPI_FAILURE(status)) {
 325                         acpi_get_name(handle, ACPI_FULL_PATHNAME, &name_buffer);
 326                         printk(KERN_ERR
 327                           "%s: Failed to find _BBN in parent of: %s\n",
 328                                         __func__, (char *)name_buffer.pointer);
 329                         kfree(name_buffer.pointer);
 330                         return AE_OK;
 331                 }
 332
 333                 slot = (adr >> 16) & 0xffff;
 334                 function = adr & 0xffff;
 335                 devfn = PCI_DEVFN(slot, function);
 336                 if ((info->devfn == devfn) && (info->bus == bbn)) {
 337                         /* We have a match! */
 338                         info->handle = handle;
 339                         return 1;
 340                 }
 341         }
 342         return AE_OK;
 343 }
 344
 345 /*
 346  * sn_acpi_get_pcidev_info - Search ACPI namespace for the acpi
 347  *                           device matching the specified pci_dev,
 348  *                           and return the pcidev info and irq info.
 349  */
 350 int
 351 sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
 352                         struct sn_irq_info **sn_irq_info)
 353 {
 354         unsigned int host_devfn;
 355         struct sn_pcidev_match pcidev_match;
 356         acpi_handle rootbus_handle;
 357         unsigned long long segment;
 358         acpi_status status;
 359         struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 360
 361         rootbus_handle = PCI_CONTROLLER(dev)->acpi_handle;
 362         status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
 363                                        &segment);
 364         if (ACPI_SUCCESS(status)) {
 365                 if (segment != pci_domain_nr(dev)) {
 366                         acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME,
 367                                 &name_buffer);
 368                         printk(KERN_ERR
 369                                "%s: Segment number mismatch, 0x%llx vs 0x%x for: %s\n",
 370                                __func__, segment, pci_domain_nr(dev),
 371                                (char *)name_buffer.pointer);
 372                         kfree(name_buffer.pointer);
 373                         return 1;
 374                 }
 375         } else {
 376                 acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME, &name_buffer);
 377                 printk(KERN_ERR "%s: Unable to get __SEG from: %s\n",
 378                        __func__, (char *)name_buffer.pointer);
 379                 kfree(name_buffer.pointer);
 380                 return 1;
 381         }
 382
 383         /*
 384          * We want to search all devices in this segment/domain
 385          * of the ACPI namespace for the matching ACPI device,
 386          * which holds the pcidev_info pointer in its vendor resource.
 387          */
 388         pcidev_match.bus = dev->bus->number;
 389         pcidev_match.devfn = dev->devfn;
 390         pcidev_match.handle = NULL;
 391
 392         acpi_walk_namespace(ACPI_TYPE_DEVICE, rootbus_handle, ACPI_UINT32_MAX,
 393                             find_matching_device, &pcidev_match, NULL);
 394
 395         if (!pcidev_match.handle) {
 396                 printk(KERN_ERR
 397                        "%s: Could not find matching ACPI device for %s.\n",
 398                        __func__, pci_name(dev));
 399                 return 1;
 400         }
 401
 402         if (sn_extract_device_info(pcidev_match.handle, pcidev_info, sn_irq_info))
 403                 return 1;
 404
 405         /* Build up the pcidev_info.pdi_slot_host_handle */
 406         host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
 407         (*pcidev_info)->pdi_slot_host_handle =
 408                         ((unsigned long) pci_domain_nr(dev) << 40) |
 409                                         /* bus == 0 */
 410                                         host_devfn;
 411         return 0;
 412 }
 413
 414 /*
 415  * sn_acpi_slot_fixup - Obtain the pcidev_info and sn_irq_info.
 416  *                      Perform any SN specific slot fixup.
 417  *                      At present there does not appear to be
 418  *                      any generic way to handle a ROM image
 419  *                      that has been shadowed by the PROM, so
 420  *                      we pass a pointer to it within the
 421  *                      pcidev_info structure.
 422  */
 423
 424 void
 425 sn_acpi_slot_fixup(struct pci_dev *dev)
 426 {
 427         void __iomem *addr;
 428         struct pcidev_info *pcidev_info = NULL;
 429         struct sn_irq_info *sn_irq_info = NULL;
 430         size_t image_size, size;
 431
 432         if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
 433                 panic("%s:  Failure obtaining pcidev_info for %s\n",
 434                       __func__, pci_name(dev));
 435         }
 436
 437         if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
 438                 /*
 439                  * A valid ROM image exists and has been shadowed by the
 440                  * PROM. Setup the pci_dev ROM resource with the address
 441                  * of the shadowed copy, and the actual length of the ROM image.
 442                  */
 443                 size = pci_resource_len(dev, PCI_ROM_RESOURCE);
 444                 addr = ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
 445                                size);
 446                 image_size = pci_get_rom_size(dev, addr, size);
 447                 dev->resource[PCI_ROM_RESOURCE].start = (unsigned long) addr;
 448                 dev->resource[PCI_ROM_RESOURCE].end =
 449                                         (unsigned long) addr + image_size - 1;
 450                 dev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_BIOS_COPY;
 451         }
 452         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 453 }
 454
 455 EXPORT_SYMBOL(sn_acpi_slot_fixup);
 456
 457
 458 /*
 459  * sn_acpi_bus_fixup -  Perform SN specific setup of software structs
 460  *                      (pcibus_bussoft, pcidev_info) and hardware
 461  *                      registers, for the specified bus and devices under it.
 462  */
 463 void
 464 sn_acpi_bus_fixup(struct pci_bus *bus)
 465 {
 466         struct pci_dev *pci_dev = NULL;
 467         struct pcibus_bussoft *prom_bussoft_ptr;
 468
 469         if (!bus->parent) {     /* If root bus */
 470                 prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
 471                 if (prom_bussoft_ptr == NULL) {
 472                         printk(KERN_ERR
 473                                "%s: 0x%04x:0x%02x Unable to "
 474                                "obtain prom_bussoft_ptr\n",
 475                                __func__, pci_domain_nr(bus), bus->number);
 476                         return;
 477                 }
 478                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 479         }
 480         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 481                 sn_acpi_slot_fixup(pci_dev);
 482         }
 483 }
 484
 485 /*
 486  * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
 487  *                   nodes and root buses in the DSDT. As a result, bus scanning
 488  *                   will be initiated by the Linux ACPI code.
 489  */
 490
 491 void __init
 492 sn_io_acpi_init(void)
 493 {
 494         u64 result;
 495         s64 status;
 496
 497         /* SN Altix does not follow the IOSAPIC IRQ routing model */
 498         acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
 499
 500         /* Setup hubdev_info for all SGIHUB/SGITIO devices */
 501         acpi_get_devices("SGIHUB", sn_acpi_hubdev_init, NULL, NULL);
 502         acpi_get_devices("SGITIO", sn_acpi_hubdev_init, NULL, NULL);
 503
 504         status = sal_ioif_init(&result);
 505         if (status || result)
 506                 panic("sal_ioif_init failed: [%lx] %s\n",
 507                       status, ia64_sal_strerror(status));
 508 }