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 <linux/export.h>
  11 #include <asm/sn/types.h>
  12 #include <asm/sn/addrs.h>
  13 #include <asm/sn/io.h>
  14 #include <asm/sn/module.h>
  15 #include <asm/sn/intr.h>
  16 #include <asm/sn/pcibus_provider_defs.h>
  17 #include <asm/sn/pcidev.h>
  18 #include <asm/sn/sn_sal.h>
  19 #include "xtalk/hubdev.h"
  20
  21 /*
  22  * The code in this file will only be executed when running with
  23  * a PROM that does _not_ have base ACPI IO support.
  24  * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
  25  */
  26
  27 static int max_segment_number;           /* Default highest segment number */
  28 static int max_pcibus_number = 255;     /* Default highest pci bus number */
  29
  30
  31 /*
  32  * Retrieve the hub device info structure for the given nasid.
  33  */
  34 static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
  35 {
  36         struct ia64_sal_retval ret_stuff;
  37         ret_stuff.status = 0;
  38         ret_stuff.v0 = 0;
  39
  40         SAL_CALL_NOLOCK(ret_stuff,
  41                         (u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
  42                         (u64) handle, (u64) address, 0, 0, 0, 0, 0);
  43         return ret_stuff.v0;
  44 }
  45
  46 /*
  47  * Retrieve the pci bus information given the bus number.
  48  */
  49 static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
  50 {
  51         struct ia64_sal_retval ret_stuff;
  52         ret_stuff.status = 0;
  53         ret_stuff.v0 = 0;
  54
  55         SAL_CALL_NOLOCK(ret_stuff,
  56                         (u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
  57                         (u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
  58         return ret_stuff.v0;
  59 }
  60
  61 /*
  62  * Retrieve the pci device information given the bus and device|function number.
  63  */
  64 static inline u64
  65 sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
  66                     u64 sn_irq_info)
  67 {
  68         struct ia64_sal_retval ret_stuff;
  69         ret_stuff.status = 0;
  70         ret_stuff.v0 = 0;
  71
  72         SAL_CALL_NOLOCK(ret_stuff,
  73                         (u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
  74                         (u64) segment, (u64) bus_number, (u64) devfn,
  75                         (u64) pci_dev,
  76                         sn_irq_info, 0, 0);
  77         return ret_stuff.v0;
  78 }
  79
  80
  81 /*
  82  * sn_fixup_ionodes() - This routine initializes the HUB data structure for
  83  *                      each node in the system. This function is only
  84  *                      executed when running with a non-ACPI capable PROM.
  85  */
  86 static void __init sn_fixup_ionodes(void)
  87 {
  88
  89         struct hubdev_info *hubdev;
  90         u64 status;
  91         u64 nasid;
  92         int i;
  93         extern void sn_common_hubdev_init(struct hubdev_info *);
  94
  95         /*
  96          * Get SGI Specific HUB chipset information.
  97          * Inform Prom that this kernel can support domain bus numbering.
  98          */
  99         for (i = 0; i < num_cnodes; i++) {
 100                 hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
 101                 nasid = cnodeid_to_nasid(i);
 102                 hubdev->max_segment_number = 0xffffffff;
 103                 hubdev->max_pcibus_number = 0xff;
 104                 status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
 105                 if (status)
 106                         continue;
 107
 108                 /* Save the largest Domain and pcibus numbers found. */
 109                 if (hubdev->max_segment_number) {
 110                         /*
 111                          * Dealing with a Prom that supports segments.
 112                          */
 113                         max_segment_number = hubdev->max_segment_number;
 114                         max_pcibus_number = hubdev->max_pcibus_number;
 115                 }
 116                 sn_common_hubdev_init(hubdev);
 117         }
 118 }
 119
 120 /*
 121  * sn_pci_legacy_window_fixup - Create PCI controller windows for
 122  *                              legacy IO and MEM space. This needs to
 123  *                              be done here, as the PROM does not have
 124  *                              ACPI support defining the root buses
 125  *                              and their resources (_CRS),
 126  */
 127 static void
 128 sn_legacy_pci_window_fixup(struct pci_controller *controller,
 129                            u64 legacy_io, u64 legacy_mem)
 130 {
 131                 controller->window = kcalloc(2, sizeof(struct pci_window),
 132                                              GFP_KERNEL);
 133                 BUG_ON(controller->window == NULL);
 134                 controller->window[0].offset = legacy_io;
 135                 controller->window[0].resource.name = "legacy_io";
 136                 controller->window[0].resource.flags = IORESOURCE_IO;
 137                 controller->window[0].resource.start = legacy_io;
 138                 controller->window[0].resource.end =
 139                                 controller->window[0].resource.start + 0xffff;
 140                 controller->window[0].resource.parent = &ioport_resource;
 141                 controller->window[1].offset = legacy_mem;
 142                 controller->window[1].resource.name = "legacy_mem";
 143                 controller->window[1].resource.flags = IORESOURCE_MEM;
 144                 controller->window[1].resource.start = legacy_mem;
 145                 controller->window[1].resource.end =
 146                        controller->window[1].resource.start + (1024 * 1024) - 1;
 147                 controller->window[1].resource.parent = &iomem_resource;
 148                 controller->windows = 2;
 149 }
 150
 151 /*
 152  * sn_pci_window_fixup() - Create a pci_window for each device resource.
 153  *                         It will setup pci_windows for use by
 154  *                         pcibios_bus_to_resource(), pcibios_resource_to_bus(),
 155  *                         etc.
 156  */
 157 static void
 158 sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
 159                     s64 * pci_addrs)
 160 {
 161         struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
 162         unsigned int i;
 163         unsigned int idx;
 164         unsigned int new_count;
 165         struct pci_window *new_window;
 166
 167         if (count == 0)
 168                 return;
 169         idx = controller->windows;
 170         new_count = controller->windows + count;
 171         new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
 172         BUG_ON(new_window == NULL);
 173         if (controller->window) {
 174                 memcpy(new_window, controller->window,
 175                        sizeof(struct pci_window) * controller->windows);
 176                 kfree(controller->window);
 177         }
 178
 179         /* Setup a pci_window for each device resource. */
 180         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 181                 if (pci_addrs[i] == -1)
 182                         continue;
 183
 184                 new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
 185                 new_window[idx].resource = dev->resource[i];
 186                 idx++;
 187         }
 188
 189         controller->windows = new_count;
 190         controller->window = new_window;
 191 }
 192
 193 /*
 194  * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
 195  *                        and need to convert the pci_dev->resource
 196  *                        'start' and 'end' addresses to mapped addresses,
 197  *                        and setup the pci_controller->window array entries.
 198  */
 199 void
 200 sn_io_slot_fixup(struct pci_dev *dev)
 201 {
 202         unsigned int count = 0;
 203         int idx;
 204         s64 pci_addrs[PCI_ROM_RESOURCE + 1];
 205         unsigned long addr, end, size, start;
 206         struct pcidev_info *pcidev_info;
 207         struct sn_irq_info *sn_irq_info;
 208         int status;
 209
 210         pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 211         if (!pcidev_info)
 212                 panic("%s: Unable to alloc memory for pcidev_info", __func__);
 213
 214         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 215         if (!sn_irq_info)
 216                 panic("%s: Unable to alloc memory for sn_irq_info", __func__);
 217
 218         /* Call to retrieve pci device information needed by kernel. */
 219         status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
 220                 (u64) dev->bus->number,
 221                 dev->devfn,
 222                 (u64) __pa(pcidev_info),
 223                 (u64) __pa(sn_irq_info));
 224
 225         BUG_ON(status); /* Cannot get platform pci device information */
 226
 227
 228         /* Copy over PIO Mapped Addresses */
 229         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
 230
 231                 if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
 232                         pci_addrs[idx] = -1;
 233                         continue;
 234                 }
 235
 236                 start = dev->resource[idx].start;
 237                 end = dev->resource[idx].end;
 238                 size = end - start;
 239                 if (size == 0) {
 240                         pci_addrs[idx] = -1;
 241                         continue;
 242                 }
 243                 pci_addrs[idx] = start;
 244                 count++;
 245                 addr = pcidev_info->pdi_pio_mapped_addr[idx];
 246                 addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
 247                 dev->resource[idx].start = addr;
 248                 dev->resource[idx].end = addr + size;
 249
 250                 /*
 251                  * if it's already in the device structure, remove it before
 252                  * inserting
 253                  */
 254                 if (dev->resource[idx].parent && dev->resource[idx].parent->child)
 255                         release_resource(&dev->resource[idx]);
 256
 257                 if (dev->resource[idx].flags & IORESOURCE_IO)
 258                         insert_resource(&ioport_resource, &dev->resource[idx]);
 259                 else
 260                         insert_resource(&iomem_resource, &dev->resource[idx]);
 261                 /*
 262                  * If ROM, set the actual ROM image size, and mark as
 263                  * shadowed in PROM.
 264                  */
 265                 if (idx == PCI_ROM_RESOURCE) {
 266                         size_t image_size;
 267                         void __iomem *rom;
 268
 269                         rom = ioremap(pci_resource_start(dev, PCI_ROM_RESOURCE),
 270                                       size + 1);
 271                         image_size = pci_get_rom_size(dev, rom, size + 1);
 272                         dev->resource[PCI_ROM_RESOURCE].end =
 273                                 dev->resource[PCI_ROM_RESOURCE].start +
 274                                 image_size - 1;
 275                         dev->resource[PCI_ROM_RESOURCE].flags |=
 276                                                  IORESOURCE_ROM_BIOS_COPY;
 277                 }
 278         }
 279         /* Create a pci_window in the pci_controller struct for
 280          * each device resource.
 281          */
 282         if (count > 0)
 283                 sn_pci_window_fixup(dev, count, pci_addrs);
 284
 285         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 286 }
 287
 288 EXPORT_SYMBOL(sn_io_slot_fixup);
 289
 290 /*
 291  * sn_pci_controller_fixup() - This routine sets up a bus's resources
 292  *                             consistent with the Linux PCI abstraction layer.
 293  */
 294 static void __init
 295 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 296 {
 297         s64 status = 0;
 298         struct pci_controller *controller;
 299         struct pcibus_bussoft *prom_bussoft_ptr;
 300
 301
 302         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 303                                      (u64) ia64_tpa(&prom_bussoft_ptr));
 304         if (status > 0)
 305                 return;         /*bus # does not exist */
 306         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 307
 308         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 309         BUG_ON(!controller);
 310         controller->segment = segment;
 311
 312         /*
 313          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
 314          * (platform_data will be overwritten later in sn_common_bus_fixup())
 315          */
 316         controller->platform_data = prom_bussoft_ptr;
 317
 318         bus = pci_scan_bus(busnum, &pci_root_ops, controller);
 319         if (bus == NULL)
 320                 goto error_return; /* error, or bus already scanned */
 321
 322         bus->sysdata = controller;
 323
 324         return;
 325
 326 error_return:
 327
 328         kfree(controller);
 329         return;
 330 }
 331
 332 /*
 333  * sn_bus_fixup
 334  */
 335 void
 336 sn_bus_fixup(struct pci_bus *bus)
 337 {
 338         struct pci_dev *pci_dev = NULL;
 339         struct pcibus_bussoft *prom_bussoft_ptr;
 340
 341         if (!bus->parent) {  /* If root bus */
 342                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
 343                 if (prom_bussoft_ptr == NULL) {
 344                         printk(KERN_ERR
 345                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
 346                                "obtain prom_bussoft_ptr\n",
 347                                pci_domain_nr(bus), bus->number);
 348                         return;
 349                 }
 350                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 351                 sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
 352                                            prom_bussoft_ptr->bs_legacy_io,
 353                                            prom_bussoft_ptr->bs_legacy_mem);
 354         }
 355         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 356                 sn_io_slot_fixup(pci_dev);
 357         }
 358
 359 }
 360
 361 /*
 362  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 363  *              so we need to do things the hard way, including initiating the
 364  *              bus scanning ourselves.
 365  */
 366
 367 void __init sn_io_init(void)
 368 {
 369         int i, j;
 370
 371         sn_fixup_ionodes();
 372
 373         /* busses are not known yet ... */
 374         for (i = 0; i <= max_segment_number; i++)
 375                 for (j = 0; j <= max_pcibus_number; j++)
 376                         sn_pci_controller_fixup(i, j, NULL);
 377 }