arch/ia64/sn/kernel/io_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) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #include <linux/slab.h>
  10 #include <asm/sn/types.h>
  11 #include <asm/sn/addrs.h>
  12 #include <asm/sn/io.h>
  13 #include <asm/sn/module.h>
  14 #include <asm/sn/intr.h>
  15 #include <asm/sn/pcibus_provider_defs.h>
  16 #include <asm/sn/pcidev.h>
  17 #include <asm/sn/sn_sal.h>
  18 #include "xtalk/hubdev.h"
  19
  20 /*
  21  * The code in this file will only be executed when running with
  22  * a PROM that does _not_ have base ACPI IO support.
  23  * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
  24  */
  25
  26 static int max_segment_number;           /* Default highest segment number */
  27 static int max_pcibus_number = 255;     /* Default highest pci bus number */
  28
  29
  30 /*
  31  * Retrieve the hub device info structure for the given nasid.
  32  */
  33 static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
  34 {
  35         struct ia64_sal_retval ret_stuff;
  36         ret_stuff.status = 0;
  37         ret_stuff.v0 = 0;
  38
  39         SAL_CALL_NOLOCK(ret_stuff,
  40                         (u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
  41                         (u64) handle, (u64) address, 0, 0, 0, 0, 0);
  42         return ret_stuff.v0;
  43 }
  44
  45 /*
  46  * Retrieve the pci bus information given the bus number.
  47  */
  48 static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
  49 {
  50         struct ia64_sal_retval ret_stuff;
  51         ret_stuff.status = 0;
  52         ret_stuff.v0 = 0;
  53
  54         SAL_CALL_NOLOCK(ret_stuff,
  55                         (u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
  56                         (u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
  57         return ret_stuff.v0;
  58 }
  59
  60 /*
  61  * Retrieve the pci device information given the bus and device|function number.
  62  */
  63 static inline u64
  64 sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
  65                     u64 sn_irq_info)
  66 {
  67         struct ia64_sal_retval ret_stuff;
  68         ret_stuff.status = 0;
  69         ret_stuff.v0 = 0;
  70
  71         SAL_CALL_NOLOCK(ret_stuff,
  72                         (u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
  73                         (u64) segment, (u64) bus_number, (u64) devfn,
  74                         (u64) pci_dev,
  75                         sn_irq_info, 0, 0);
  76         return ret_stuff.v0;
  77 }
  78
  79
  80 /*
  81  * sn_fixup_ionodes() - This routine initializes the HUB data structure for
  82  *                      each node in the system. This function is only
  83  *                      executed when running with a non-ACPI capable PROM.
  84  */
  85 static void __init sn_fixup_ionodes(void)
  86 {
  87
  88         struct hubdev_info *hubdev;
  89         u64 status;
  90         u64 nasid;
  91         int i;
  92         extern void sn_common_hubdev_init(struct hubdev_info *);
  93
  94         /*
  95          * Get SGI Specific HUB chipset information.
  96          * Inform Prom that this kernel can support domain bus numbering.
  97          */
  98         for (i = 0; i < num_cnodes; i++) {
  99                 hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
 100                 nasid = cnodeid_to_nasid(i);
 101                 hubdev->max_segment_number = 0xffffffff;
 102                 hubdev->max_pcibus_number = 0xff;
 103                 status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
 104                 if (status)
 105                         continue;
 106
 107                 /* Save the largest Domain and pcibus numbers found. */
 108                 if (hubdev->max_segment_number) {
 109                         /*
 110                          * Dealing with a Prom that supports segments.
 111                          */
 112                         max_segment_number = hubdev->max_segment_number;
 113                         max_pcibus_number = hubdev->max_pcibus_number;
 114                 }
 115                 sn_common_hubdev_init(hubdev);
 116         }
 117 }
 118
 119 /*
 120  * sn_pci_legacy_window_fixup - Create PCI controller windows for
 121  *                              legacy IO and MEM space. This needs to
 122  *                              be done here, as the PROM does not have
 123  *                              ACPI support defining the root buses
 124  *                              and their resources (_CRS),
 125  */
 126 static void
 127 sn_legacy_pci_window_fixup(struct pci_controller *controller,
 128                            u64 legacy_io, u64 legacy_mem)
 129 {
 130                 controller->window = kcalloc(2, sizeof(struct pci_window),
 131                                              GFP_KERNEL);
 132                 BUG_ON(controller->window == NULL);
 133                 controller->window[0].offset = legacy_io;
 134                 controller->window[0].resource.name = "legacy_io";
 135                 controller->window[0].resource.flags = IORESOURCE_IO;
 136                 controller->window[0].resource.start = legacy_io;
 137                 controller->window[0].resource.end =
 138                                 controller->window[0].resource.start + 0xffff;
 139                 controller->window[0].resource.parent = &ioport_resource;
 140                 controller->window[1].offset = legacy_mem;
 141                 controller->window[1].resource.name = "legacy_mem";
 142                 controller->window[1].resource.flags = IORESOURCE_MEM;
 143                 controller->window[1].resource.start = legacy_mem;
 144                 controller->window[1].resource.end =
 145                        controller->window[1].resource.start + (1024 * 1024) - 1;
 146                 controller->window[1].resource.parent = &iomem_resource;
 147                 controller->windows = 2;
 148 }
 149
 150 /*
 151  * sn_pci_window_fixup() - Create a pci_window for each device resource.
 152  *                         It will setup pci_windows for use by
 153  *                         pcibios_bus_to_resource(), pcibios_resource_to_bus(),
 154  *                         etc.
 155  */
 156 static void
 157 sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
 158                     s64 * pci_addrs)
 159 {
 160         struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
 161         unsigned int i;
 162         unsigned int idx;
 163         unsigned int new_count;
 164         struct pci_window *new_window;
 165
 166         if (count == 0)
 167                 return;
 168         idx = controller->windows;
 169         new_count = controller->windows + count;
 170         new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
 171         BUG_ON(new_window == NULL);
 172         if (controller->window) {
 173                 memcpy(new_window, controller->window,
 174                        sizeof(struct pci_window) * controller->windows);
 175                 kfree(controller->window);
 176         }
 177
 178         /* Setup a pci_window for each device resource. */
 179         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 180                 if (pci_addrs[i] == -1)
 181                         continue;
 182
 183                 new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
 184                 new_window[idx].resource = dev->resource[i];
 185                 idx++;
 186         }
 187
 188         controller->windows = new_count;
 189         controller->window = new_window;
 190 }
 191
 192 /*
 193  * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
 194  *                        and need to convert the pci_dev->resource
 195  *                        'start' and 'end' addresses to mapped addresses,
 196  *                        and setup the pci_controller->window array entries.
 197  */
 198 void
 199 sn_io_slot_fixup(struct pci_dev *dev)
 200 {
 201         unsigned int count = 0;
 202         int idx;
 203         s64 pci_addrs[PCI_ROM_RESOURCE + 1];
 204         unsigned long addr, end, size, start;
 205         struct pcidev_info *pcidev_info;
 206         struct sn_irq_info *sn_irq_info;
 207         int status;
 208
 209         pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 210         if (!pcidev_info)
 211                 panic("%s: Unable to alloc memory for pcidev_info", __func__);
 212
 213         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 214         if (!sn_irq_info)
 215                 panic("%s: Unable to alloc memory for sn_irq_info", __func__);
 216
 217         /* Call to retrieve pci device information needed by kernel. */
 218         status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
 219                 (u64) dev->bus->number,
 220                 dev->devfn,
 221                 (u64) __pa(pcidev_info),
 222                 (u64) __pa(sn_irq_info));
 223
 224         BUG_ON(status); /* Cannot get platform pci device information */
 225
 226
 227         /* Copy over PIO Mapped Addresses */
 228         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
 229
 230                 if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
 231                         pci_addrs[idx] = -1;
 232                         continue;
 233                 }
 234
 235                 start = dev->resource[idx].start;
 236                 end = dev->resource[idx].end;
 237                 size = end - start;
 238                 if (size == 0) {
 239                         pci_addrs[idx] = -1;
 240                         continue;
 241                 }
 242                 pci_addrs[idx] = start;
 243                 count++;
 244                 addr = pcidev_info->pdi_pio_mapped_addr[idx];
 245                 addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
 246                 dev->resource[idx].start = addr;
 247                 dev->resource[idx].end = addr + size;
 248
 249                 /*
 250                  * if it's already in the device structure, remove it before
 251                  * inserting
 252                  */
 253                 if (dev->resource[idx].parent && dev->resource[idx].parent->child)
 254                         release_resource(&dev->resource[idx]);
 255
 256                 if (dev->resource[idx].flags & IORESOURCE_IO)
 257                         insert_resource(&ioport_resource, &dev->resource[idx]);
 258                 else
 259                         insert_resource(&iomem_resource, &dev->resource[idx]);
 260                 /*
 261                  * If ROM, set the actual ROM image size, and mark as
 262                  * shadowed in PROM.
 263                  */
 264                 if (idx == PCI_ROM_RESOURCE) {
 265                         size_t image_size;
 266                         void __iomem *rom;
 267
 268                         rom = ioremap(pci_resource_start(dev, PCI_ROM_RESOURCE),
 269                                       size + 1);
 270                         image_size = pci_get_rom_size(dev, rom, size + 1);
 271                         dev->resource[PCI_ROM_RESOURCE].end =
 272                                 dev->resource[PCI_ROM_RESOURCE].start +
 273                                 image_size - 1;
 274                         dev->resource[PCI_ROM_RESOURCE].flags |=
 275                                                  IORESOURCE_ROM_BIOS_COPY;
 276                 }
 277         }
 278         /* Create a pci_window in the pci_controller struct for
 279          * each device resource.
 280          */
 281         if (count > 0)
 282                 sn_pci_window_fixup(dev, count, pci_addrs);
 283
 284         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 285 }
 286
 287 EXPORT_SYMBOL(sn_io_slot_fixup);
 288
 289 /*
 290  * sn_pci_controller_fixup() - This routine sets up a bus's resources
 291  *                             consistent with the Linux PCI abstraction layer.
 292  */
 293 static void __init
 294 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 295 {
 296         s64 status = 0;
 297         struct pci_controller *controller;
 298         struct pcibus_bussoft *prom_bussoft_ptr;
 299
 300
 301         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 302                                      (u64) ia64_tpa(&prom_bussoft_ptr));
 303         if (status > 0)
 304                 return;         /*bus # does not exist */
 305         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 306
 307         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 308         BUG_ON(!controller);
 309         controller->segment = segment;
 310
 311         /*
 312          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
 313          * (platform_data will be overwritten later in sn_common_bus_fixup())
 314          */
 315         controller->platform_data = prom_bussoft_ptr;
 316
 317         bus = pci_scan_bus(busnum, &pci_root_ops, controller);
 318         if (bus == NULL)
 319                 goto error_return; /* error, or bus already scanned */
 320
 321         bus->sysdata = controller;
 322
 323         return;
 324
 325 error_return:
 326
 327         kfree(controller);
 328         return;
 329 }
 330
 331 /*
 332  * sn_bus_fixup
 333  */
 334 void
 335 sn_bus_fixup(struct pci_bus *bus)
 336 {
 337         struct pci_dev *pci_dev = NULL;
 338         struct pcibus_bussoft *prom_bussoft_ptr;
 339
 340         if (!bus->parent) {  /* If root bus */
 341                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
 342                 if (prom_bussoft_ptr == NULL) {
 343                         printk(KERN_ERR
 344                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
 345                                "obtain prom_bussoft_ptr\n",
 346                                pci_domain_nr(bus), bus->number);
 347                         return;
 348                 }
 349                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 350                 sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
 351                                            prom_bussoft_ptr->bs_legacy_io,
 352                                            prom_bussoft_ptr->bs_legacy_mem);
 353         }
 354         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 355                 sn_io_slot_fixup(pci_dev);
 356         }
 357
 358 }
 359
 360 /*
 361  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 362  *              so we need to do things the hard way, including initiating the
 363  *              bus scanning ourselves.
 364  */
 365
 366 void __init sn_io_init(void)
 367 {
 368         int i, j;
 369
 370         sn_fixup_ionodes();
 371
 372         /* busses are not known yet ... */
 373         for (i = 0; i <= max_segment_number; i++)
 374                 for (j = 0; j <= max_pcibus_number; j++)
 375                         sn_pci_controller_fixup(i, j, NULL);
 376 }