arch/ia64/sn/kernel/io_acpi_init.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) 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 #include <acpi/acnamesp.h>
  17
  18
  19 /*
  20  * The code in this file will only be executed when running with
  21  * a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
  22  */
  23
  24
  25 /*
  26  * This value must match the UUID the PROM uses
  27  * (io/acpi/defblk.c) when building a vendor descriptor.
  28  */
  29 struct acpi_vendor_uuid sn_uuid = {
  30         .subtype = 0,
  31         .data   = { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
  32                     0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
  33 };
  34
  35 struct sn_pcidev_match {
  36         u8 bus;
  37         unsigned int devfn;
  38         acpi_handle handle;
  39 };
  40
  41 /*
  42  * Perform the early IO init in PROM.
  43  */
  44 static s64
  45 sal_ioif_init(u64 *result)
  46 {
  47         struct ia64_sal_retval isrv = {0,0,0,0};
  48
  49         SAL_CALL_NOLOCK(isrv,
  50                         SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
  51         *result = isrv.v0;
  52         return isrv.status;
  53 }
  54
  55 /*
  56  * sn_acpi_hubdev_init() - This function is called by acpi_ns_get_device_callback()
  57  *                         for all SGIHUB and SGITIO acpi devices defined in the
  58  *                         DSDT. It obtains the hubdev_info pointer from the
  59  *                         ACPI vendor resource, which the PROM setup, and sets up the
  60  *                         hubdev_info in the pda.
  61  */
  62
  63 static acpi_status __init
  64 sn_acpi_hubdev_init(acpi_handle handle, u32 depth, void *context, void **ret)
  65 {
  66         struct acpi_buffer 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                 printk(KERN_ERR
  81                        "sn_acpi_hubdev_init: acpi_get_vendor_resource() "
  82                        "(0x%x) failed for: ", status);
  83                 acpi_ns_print_node_pathname(handle, NULL);
  84                 printk("\n");
  85                 return AE_OK;           /* Continue walking namespace */
  86         }
  87
  88         resource = buffer.pointer;
  89         vendor = &resource->data.vendor_typed;
  90         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
  91             sizeof(struct hubdev_info *)) {
  92                 printk(KERN_ERR
  93                        "sn_acpi_hubdev_init: Invalid vendor data length: %d for: ",
  94                         vendor->byte_length);
  95                 acpi_ns_print_node_pathname(handle, NULL);
  96                 printk("\n");
  97                 goto exit;
  98         }
  99
 100         memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
 101         hubdev_ptr = __va((struct hubdev_info *) addr);
 102
 103         nasid = hubdev_ptr->hdi_nasid;
 104         i = nasid_to_cnodeid(nasid);
 105         hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
 106         *hubdev = *hubdev_ptr;
 107         sn_common_hubdev_init(hubdev);
 108
 109 exit:
 110         kfree(buffer.pointer);
 111         return AE_OK;           /* Continue walking namespace */
 112 }
 113
 114 /*
 115  * sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
 116  *                        the ACPI Vendor resource for this bus.
 117  */
 118 static struct pcibus_bussoft *
 119 sn_get_bussoft_ptr(struct pci_bus *bus)
 120 {
 121         u64 addr;
 122         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 123         acpi_handle handle;
 124         struct pcibus_bussoft *prom_bussoft_ptr;
 125         struct acpi_resource *resource;
 126         acpi_status status;
 127         struct acpi_resource_vendor_typed *vendor;
 128
 129
 130         handle = PCI_CONTROLLER(bus)->acpi_handle;
 131         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 132                                           &sn_uuid, &buffer);
 133         if (ACPI_FAILURE(status)) {
 134                 printk(KERN_ERR "%s: "
 135                        "acpi_get_vendor_resource() failed (0x%x) for: ",
 136                        __FUNCTION__, status);
 137                 acpi_ns_print_node_pathname(handle, NULL);
 138                 printk("\n");
 139                 return NULL;
 140         }
 141         resource = buffer.pointer;
 142         vendor = &resource->data.vendor_typed;
 143
 144         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 145              sizeof(struct pcibus_bussoft *)) {
 146                 printk(KERN_ERR
 147                        "%s: Invalid vendor data length %d\n",
 148                         __FUNCTION__, vendor->byte_length);
 149                 kfree(buffer.pointer);
 150                 return NULL;
 151         }
 152         memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
 153         prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
 154         kfree(buffer.pointer);
 155
 156         return prom_bussoft_ptr;
 157 }
 158
 159 /*
 160  * sn_extract_device_info - Extract the pcidev_info and the sn_irq_info
 161  *                          pointers from the vendor resource using the
 162  *                          provided acpi handle, and copy the structures
 163  *                          into the argument buffers.
 164  */
 165 static int
 166 sn_extract_device_info(acpi_handle handle, struct pcidev_info **pcidev_info,
 167                     struct sn_irq_info **sn_irq_info)
 168 {
 169         u64 addr;
 170         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 171         struct sn_irq_info *irq_info, *irq_info_prom;
 172         struct pcidev_info *pcidev_ptr, *pcidev_prom_ptr;
 173         struct acpi_resource *resource;
 174         int ret = 0;
 175         acpi_status status;
 176         struct acpi_resource_vendor_typed *vendor;
 177
 178         /*
 179          * The pointer to this device's pcidev_info structure in
 180          * the PROM, is in the vendor resource.
 181          */
 182         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 183                                           &sn_uuid, &buffer);
 184         if (ACPI_FAILURE(status)) {
 185                 printk(KERN_ERR
 186                        "%s: acpi_get_vendor_resource() failed (0x%x) for: ",
 187                         __FUNCTION__, status);
 188                 acpi_ns_print_node_pathname(handle, NULL);
 189                 printk("\n");
 190                 return 1;
 191         }
 192
 193         resource = buffer.pointer;
 194         vendor = &resource->data.vendor_typed;
 195         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 196             sizeof(struct pci_devdev_info *)) {
 197                 printk(KERN_ERR
 198                        "%s: Invalid vendor data length: %d for: ",
 199                         __FUNCTION__, vendor->byte_length);
 200                 acpi_ns_print_node_pathname(handle, NULL);
 201                 printk("\n");
 202                 ret = 1;
 203                 goto exit;
 204         }
 205
 206         pcidev_ptr = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 207         if (!pcidev_ptr)
 208                 panic("%s: Unable to alloc memory for pcidev_info", __FUNCTION__);
 209
 210         memcpy(&addr, vendor->byte_data, sizeof(struct pcidev_info *));
 211         pcidev_prom_ptr = __va(addr);
 212         memcpy(pcidev_ptr, pcidev_prom_ptr, sizeof(struct pcidev_info));
 213
 214         /* Get the IRQ info */
 215         irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 216         if (!irq_info)
 217                  panic("%s: Unable to alloc memory for sn_irq_info", __FUNCTION__);
 218
 219         if (pcidev_ptr->pdi_sn_irq_info) {
 220                 irq_info_prom = __va(pcidev_ptr->pdi_sn_irq_info);
 221                 memcpy(irq_info, irq_info_prom, sizeof(struct sn_irq_info));
 222         }
 223
 224         *pcidev_info = pcidev_ptr;
 225         *sn_irq_info = irq_info;
 226
 227 exit:
 228         kfree(buffer.pointer);
 229         return ret;
 230 }
 231
 232 static unsigned int
 233 get_host_devfn(acpi_handle device_handle, acpi_handle rootbus_handle)
 234 {
 235         unsigned long adr;
 236         acpi_handle child;
 237         unsigned int devfn;
 238         int function;
 239         acpi_handle parent;
 240         int slot;
 241         acpi_status status;
 242
 243         /*
 244          * Do an upward search to find the root bus device, and
 245          * obtain the host devfn from the previous child device.
 246          */
 247         child = device_handle;
 248         while (child) {
 249                 status = acpi_get_parent(child, &parent);
 250                 if (ACPI_FAILURE(status)) {
 251                         printk(KERN_ERR "%s: acpi_get_parent() failed "
 252                                "(0x%x) for: ", __FUNCTION__, status);
 253                         acpi_ns_print_node_pathname(child, NULL);
 254                         printk("\n");
 255                         panic("%s: Unable to find host devfn\n", __FUNCTION__);
 256                 }
 257                 if (parent == rootbus_handle)
 258                         break;
 259                 child = parent;
 260         }
 261         if (!child) {
 262                 printk(KERN_ERR "%s: Unable to find root bus for: ",
 263                        __FUNCTION__);
 264                 acpi_ns_print_node_pathname(device_handle, NULL);
 265                 printk("\n");
 266                 BUG();
 267         }
 268
 269         status = acpi_evaluate_integer(child, METHOD_NAME__ADR, NULL, &adr);
 270         if (ACPI_FAILURE(status)) {
 271                 printk(KERN_ERR "%s: Unable to get _ADR (0x%x) for: ",
 272                        __FUNCTION__, status);
 273                 acpi_ns_print_node_pathname(child, NULL);
 274                 printk("\n");
 275                 panic("%s: Unable to find host devfn\n", __FUNCTION__);
 276         }
 277
 278         slot = (adr >> 16) & 0xffff;
 279         function = adr & 0xffff;
 280         devfn = PCI_DEVFN(slot, function);
 281         return devfn;
 282 }
 283
 284 /*
 285  * find_matching_device - Callback routine to find the ACPI device
 286  *                        that matches up with our pci_dev device.
 287  *                        Matching is done on bus number and devfn.
 288  *                        To find the bus number for a particular
 289  *                        ACPI device, we must look at the _BBN method
 290  *                        of its parent.
 291  */
 292 static acpi_status
 293 find_matching_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 294 {
 295         unsigned long bbn = -1;
 296         unsigned long adr;
 297         acpi_handle parent = NULL;
 298         acpi_status status;
 299         unsigned int devfn;
 300         int function;
 301         int slot;
 302         struct sn_pcidev_match *info = context;
 303
 304         status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 305                                        &adr);
 306         if (ACPI_SUCCESS(status)) {
 307                 status = acpi_get_parent(handle, &parent);
 308                 if (ACPI_FAILURE(status)) {
 309                         printk(KERN_ERR
 310                                "%s: acpi_get_parent() failed (0x%x) for: ",
 311                                         __FUNCTION__, status);
 312                         acpi_ns_print_node_pathname(handle, NULL);
 313                         printk("\n");
 314                         return AE_OK;
 315                 }
 316                 status = acpi_evaluate_integer(parent, METHOD_NAME__BBN,
 317                                                NULL, &bbn);
 318                 if (ACPI_FAILURE(status)) {
 319                         printk(KERN_ERR
 320                           "%s: Failed to find _BBN in parent of: ",
 321                                         __FUNCTION__);
 322                         acpi_ns_print_node_pathname(handle, NULL);
 323                         printk("\n");
 324                         return AE_OK;
 325                 }
 326
 327                 slot = (adr >> 16) & 0xffff;
 328                 function = adr & 0xffff;
 329                 devfn = PCI_DEVFN(slot, function);
 330                 if ((info->devfn == devfn) && (info->bus == bbn)) {
 331                         /* We have a match! */
 332                         info->handle = handle;
 333                         return 1;
 334                 }
 335         }
 336         return AE_OK;
 337 }
 338
 339 /*
 340  * sn_acpi_get_pcidev_info - Search ACPI namespace for the acpi
 341  *                           device matching the specified pci_dev,
 342  *                           and return the pcidev info and irq info.
 343  */
 344 int
 345 sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
 346                         struct sn_irq_info **sn_irq_info)
 347 {
 348         unsigned int host_devfn;
 349         struct sn_pcidev_match pcidev_match;
 350         acpi_handle rootbus_handle;
 351         unsigned long segment;
 352         acpi_status status;
 353
 354         rootbus_handle = PCI_CONTROLLER(dev)->acpi_handle;
 355         status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
 356                                        &segment);
 357         if (ACPI_SUCCESS(status)) {
 358                 if (segment != pci_domain_nr(dev)) {
 359                         printk(KERN_ERR
 360                                "%s: Segment number mismatch, 0x%lx vs 0x%x for: ",
 361                                __FUNCTION__, segment, pci_domain_nr(dev));
 362                         acpi_ns_print_node_pathname(rootbus_handle, NULL);
 363                         printk("\n");
 364                         return 1;
 365                 }
 366         } else {
 367                 printk(KERN_ERR "%s: Unable to get __SEG from: ",
 368                        __FUNCTION__);
 369                 acpi_ns_print_node_pathname(rootbus_handle, NULL);
 370                 printk("\n");
 371                 return 1;
 372         }
 373
 374         /*
 375          * We want to search all devices in this segment/domain
 376          * of the ACPI namespace for the matching ACPI device,
 377          * which holds the pcidev_info pointer in its vendor resource.
 378          */
 379         pcidev_match.bus = dev->bus->number;
 380         pcidev_match.devfn = dev->devfn;
 381         pcidev_match.handle = NULL;
 382
 383         acpi_walk_namespace(ACPI_TYPE_DEVICE, rootbus_handle, ACPI_UINT32_MAX,
 384                             find_matching_device, &pcidev_match, NULL);
 385
 386         if (!pcidev_match.handle) {
 387                 printk(KERN_ERR
 388                        "%s: Could not find matching ACPI device for %s.\n",
 389                        __FUNCTION__, pci_name(dev));
 390                 return 1;
 391         }
 392
 393         if (sn_extract_device_info(pcidev_match.handle, pcidev_info, sn_irq_info))
 394                 return 1;
 395
 396         /* Build up the pcidev_info.pdi_slot_host_handle */
 397         host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
 398         (*pcidev_info)->pdi_slot_host_handle =
 399                         ((unsigned long) pci_domain_nr(dev) << 40) |
 400                                         /* bus == 0 */
 401                                         host_devfn;
 402         return 0;
 403 }
 404
 405 /*
 406  * sn_acpi_slot_fixup - Obtain the pcidev_info and sn_irq_info.
 407  *                      Perform any SN specific slot fixup.
 408  *                      At present there does not appear to be
 409  *                      any generic way to handle a ROM image
 410  *                      that has been shadowed by the PROM, so
 411  *                      we pass a pointer to it within the
 412  *                      pcidev_info structure.
 413  */
 414
 415 void
 416 sn_acpi_slot_fixup(struct pci_dev *dev)
 417 {
 418         void __iomem *addr;
 419         struct pcidev_info *pcidev_info = NULL;
 420         struct sn_irq_info *sn_irq_info = NULL;
 421         size_t size;
 422
 423         if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
 424                 panic("%s:  Failure obtaining pcidev_info for %s\n",
 425                       __FUNCTION__, pci_name(dev));
 426         }
 427
 428         if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
 429                 /*
 430                  * A valid ROM image exists and has been shadowed by the
 431                  * PROM. Setup the pci_dev ROM resource to point to
 432                  * the shadowed copy.
 433                  */
 434                 size = dev->resource[PCI_ROM_RESOURCE].end -
 435                                 dev->resource[PCI_ROM_RESOURCE].start;
 436                 addr =
 437                      ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
 438                              size);
 439                 dev->resource[PCI_ROM_RESOURCE].start = (unsigned long) addr;
 440                 dev->resource[PCI_ROM_RESOURCE].end =
 441                                                 (unsigned long) addr + size;
 442                 dev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_BIOS_COPY;
 443         }
 444         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 445 }
 446
 447 EXPORT_SYMBOL(sn_acpi_slot_fixup);
 448
 449
 450 /*
 451  * sn_acpi_bus_fixup -  Perform SN specific setup of software structs
 452  *                      (pcibus_bussoft, pcidev_info) and hardware
 453  *                      registers, for the specified bus and devices under it.
 454  */
 455 void
 456 sn_acpi_bus_fixup(struct pci_bus *bus)
 457 {
 458         struct pci_dev *pci_dev = NULL;
 459         struct pcibus_bussoft *prom_bussoft_ptr;
 460
 461         if (!bus->parent) {     /* If root bus */
 462                 prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
 463                 if (prom_bussoft_ptr == NULL) {
 464                         printk(KERN_ERR
 465                                "%s: 0x%04x:0x%02x Unable to "
 466                                "obtain prom_bussoft_ptr\n",
 467                                __FUNCTION__, pci_domain_nr(bus), bus->number);
 468                         return;
 469                 }
 470                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 471         }
 472         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 473                 sn_acpi_slot_fixup(pci_dev);
 474         }
 475 }
 476
 477 /*
 478  * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
 479  *                   nodes and root buses in the DSDT. As a result, bus scanning
 480  *                   will be initiated by the Linux ACPI code.
 481  */
 482
 483 void __init
 484 sn_io_acpi_init(void)
 485 {
 486         u64 result;
 487         s64 status;
 488
 489         /* SN Altix does not follow the IOSAPIC IRQ routing model */
 490         acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
 491
 492         /* Setup hubdev_info for all SGIHUB/SGITIO devices */
 493         acpi_get_devices("SGIHUB", sn_acpi_hubdev_init, NULL, NULL);
 494         acpi_get_devices("SGITIO", sn_acpi_hubdev_init, NULL, NULL);
 495
 496         status = sal_ioif_init(&result);
 497         if (status || result)
 498                 panic("sal_ioif_init failed: [%lx] %s\n",
 499                       status, ia64_sal_strerror(status));
 500 }