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 <asm/sn/types.h>
  10 #include <asm/sn/addrs.h>
  11 #include <asm/sn/io.h>
  12 #include <asm/sn/module.h>
  13 #include <asm/sn/intr.h>
  14 #include <asm/sn/pcibus_provider_defs.h>
  15 #include <asm/sn/pcidev.h>
  16 #include <asm/sn/sn_sal.h>
  17 #include "xtalk/hubdev.h"
  18
  19 /*
  20  * The code in this file will only be executed when running with
  21  * a PROM that does _not_ have base ACPI IO support.
  22  * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
  23  */
  24
  25 static int max_segment_number;           /* Default highest segment number */
  26 static int max_pcibus_number = 255;     /* Default highest pci bus number */
  27
  28
  29 /*
  30  * Retrieve the hub device info structure for the given nasid.
  31  */
  32 static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
  33 {
  34         struct ia64_sal_retval ret_stuff;
  35         ret_stuff.status = 0;
  36         ret_stuff.v0 = 0;
  37
  38         SAL_CALL_NOLOCK(ret_stuff,
  39                         (u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
  40                         (u64) handle, (u64) address, 0, 0, 0, 0, 0);
  41         return ret_stuff.v0;
  42 }
  43
  44 /*
  45  * Retrieve the pci bus information given the bus number.
  46  */
  47 static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
  48 {
  49         struct ia64_sal_retval ret_stuff;
  50         ret_stuff.status = 0;
  51         ret_stuff.v0 = 0;
  52
  53         SAL_CALL_NOLOCK(ret_stuff,
  54                         (u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
  55                         (u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
  56         return ret_stuff.v0;
  57 }
  58
  59 /*
  60  * Retrieve the pci device information given the bus and device|function number.
  61  */
  62 static inline u64
  63 sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
  64                     u64 sn_irq_info)
  65 {
  66         struct ia64_sal_retval ret_stuff;
  67         ret_stuff.status = 0;
  68         ret_stuff.v0 = 0;
  69
  70         SAL_CALL_NOLOCK(ret_stuff,
  71                         (u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
  72                         (u64) segment, (u64) bus_number, (u64) devfn,
  73                         (u64) pci_dev,
  74                         sn_irq_info, 0, 0);
  75         return ret_stuff.v0;
  76 }
  77
  78
  79 /*
  80  * sn_fixup_ionodes() - This routine initializes the HUB data structure for
  81  *                      each node in the system. This function is only
  82  *                      executed when running with a non-ACPI capable PROM.
  83  */
  84 static void __init sn_fixup_ionodes(void)
  85 {
  86
  87         struct hubdev_info *hubdev;
  88         u64 status;
  89         u64 nasid;
  90         int i;
  91         extern void sn_common_hubdev_init(struct hubdev_info *);
  92
  93         /*
  94          * Get SGI Specific HUB chipset information.
  95          * Inform Prom that this kernel can support domain bus numbering.
  96          */
  97         for (i = 0; i < num_cnodes; i++) {
  98                 hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
  99                 nasid = cnodeid_to_nasid(i);
 100                 hubdev->max_segment_number = 0xffffffff;
 101                 hubdev->max_pcibus_number = 0xff;
 102                 status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
 103                 if (status)
 104                         continue;
 105
 106                 /* Save the largest Domain and pcibus numbers found. */
 107                 if (hubdev->max_segment_number) {
 108                         /*
 109                          * Dealing with a Prom that supports segments.
 110                          */
 111                         max_segment_number = hubdev->max_segment_number;
 112                         max_pcibus_number = hubdev->max_pcibus_number;
 113                 }
 114                 sn_common_hubdev_init(hubdev);
 115         }
 116 }
 117
 118 /*
 119  * sn_pci_legacy_window_fixup - Create PCI controller windows for
 120  *                              legacy IO and MEM space. This needs to
 121  *                              be done here, as the PROM does not have
 122  *                              ACPI support defining the root buses
 123  *                              and their resources (_CRS),
 124  */
 125 static void
 126 sn_legacy_pci_window_fixup(struct pci_controller *controller,
 127                            u64 legacy_io, u64 legacy_mem)
 128 {
 129                 controller->window = kcalloc(2, sizeof(struct pci_window),
 130                                              GFP_KERNEL);
 131                 if (controller->window == NULL)
 132                         BUG();
 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         if (new_window == NULL)
 172                 BUG();
 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", __FUNCTION__);
 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", __FUNCTION__);
 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         if (status)
 226                 BUG(); /* Cannot get platform pci device information */
 227
 228
 229         /* Copy over PIO Mapped Addresses */
 230         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
 231
 232                 if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
 233                         pci_addrs[idx] = -1;
 234                         continue;
 235                 }
 236
 237                 start = dev->resource[idx].start;
 238                 end = dev->resource[idx].end;
 239                 size = end - start;
 240                 if (size == 0) {
 241                         pci_addrs[idx] = -1;
 242                         continue;
 243                 }
 244                 pci_addrs[idx] = start;
 245                 count++;
 246                 addr = pcidev_info->pdi_pio_mapped_addr[idx];
 247                 addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
 248                 dev->resource[idx].start = addr;
 249                 dev->resource[idx].end = addr + size;
 250                 if (dev->resource[idx].flags & IORESOURCE_IO)
 251                         dev->resource[idx].parent = &ioport_resource;
 252                 else
 253                         dev->resource[idx].parent = &iomem_resource;
 254                 /* If ROM, mark as shadowed in PROM */
 255                 if (idx == PCI_ROM_RESOURCE)
 256                         dev->resource[idx].flags |= IORESOURCE_ROM_BIOS_COPY;
 257         }
 258         /* Create a pci_window in the pci_controller struct for
 259          * each device resource.
 260          */
 261         if (count > 0)
 262                 sn_pci_window_fixup(dev, count, pci_addrs);
 263
 264         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 265 }
 266
 267 EXPORT_SYMBOL(sn_io_slot_fixup);
 268
 269 /*
 270  * sn_pci_controller_fixup() - This routine sets up a bus's resources
 271  *                             consistent with the Linux PCI abstraction layer.
 272  */
 273 static void
 274 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 275 {
 276         s64 status = 0;
 277         struct pci_controller *controller;
 278         struct pcibus_bussoft *prom_bussoft_ptr;
 279
 280
 281         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 282                                      (u64) ia64_tpa(&prom_bussoft_ptr));
 283         if (status > 0)
 284                 return;         /*bus # does not exist */
 285         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 286
 287         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 288         if (!controller)
 289                 BUG();
 290         controller->segment = segment;
 291
 292         /*
 293          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
 294          * (platform_data will be overwritten later in sn_common_bus_fixup())
 295          */
 296         controller->platform_data = prom_bussoft_ptr;
 297
 298         bus = pci_scan_bus(busnum, &pci_root_ops, controller);
 299         if (bus == NULL)
 300                 goto error_return; /* error, or bus already scanned */
 301
 302         bus->sysdata = controller;
 303
 304         return;
 305
 306 error_return:
 307
 308         kfree(controller);
 309         return;
 310 }
 311
 312 /*
 313  * sn_bus_fixup
 314  */
 315 void
 316 sn_bus_fixup(struct pci_bus *bus)
 317 {
 318         struct pci_dev *pci_dev = NULL;
 319         struct pcibus_bussoft *prom_bussoft_ptr;
 320
 321         if (!bus->parent) {  /* If root bus */
 322                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
 323                 if (prom_bussoft_ptr == NULL) {
 324                         printk(KERN_ERR
 325                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
 326                                "obtain prom_bussoft_ptr\n",
 327                                pci_domain_nr(bus), bus->number);
 328                         return;
 329                 }
 330                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 331                 sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
 332                                            prom_bussoft_ptr->bs_legacy_io,
 333                                            prom_bussoft_ptr->bs_legacy_mem);
 334         }
 335         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 336                 sn_io_slot_fixup(pci_dev);
 337         }
 338
 339 }
 340
 341 /*
 342  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 343  *              so we need to do things the hard way, including initiating the
 344  *              bus scanning ourselves.
 345  */
 346
 347 void __init sn_io_init(void)
 348 {
 349         int i, j;
 350
 351         sn_fixup_ionodes();
 352
 353         /* busses are not known yet ... */
 354         for (i = 0; i <= max_segment_number; i++)
 355                 for (j = 0; j <= max_pcibus_number; j++)
 356                         sn_pci_controller_fixup(i, j, NULL);
 357 }