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 /*
  61  * sn_fixup_ionodes() - This routine initializes the HUB data structure for
  62  *                      each node in the system. This function is only
  63  *                      executed when running with a non-ACPI capable PROM.
  64  */
  65 static void __init sn_fixup_ionodes(void)
  66 {
  67
  68         struct hubdev_info *hubdev;
  69         u64 status;
  70         u64 nasid;
  71         int i;
  72         extern void sn_common_hubdev_init(struct hubdev_info *);
  73
  74         /*
  75          * Get SGI Specific HUB chipset information.
  76          * Inform Prom that this kernel can support domain bus numbering.
  77          */
  78         for (i = 0; i < num_cnodes; i++) {
  79                 hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
  80                 nasid = cnodeid_to_nasid(i);
  81                 hubdev->max_segment_number = 0xffffffff;
  82                 hubdev->max_pcibus_number = 0xff;
  83                 status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
  84                 if (status)
  85                         continue;
  86
  87                 /* Save the largest Domain and pcibus numbers found. */
  88                 if (hubdev->max_segment_number) {
  89                         /*
  90                          * Dealing with a Prom that supports segments.
  91                          */
  92                         max_segment_number = hubdev->max_segment_number;
  93                         max_pcibus_number = hubdev->max_pcibus_number;
  94                 }
  95                 sn_common_hubdev_init(hubdev);
  96         }
  97 }
  98
  99 /*
 100  * sn_pci_legacy_window_fixup - Create PCI controller windows for
 101  *                              legacy IO and MEM space. This needs to
 102  *                              be done here, as the PROM does not have
 103  *                              ACPI support defining the root buses
 104  *                              and their resources (_CRS),
 105  */
 106 static void
 107 sn_legacy_pci_window_fixup(struct pci_controller *controller,
 108                            u64 legacy_io, u64 legacy_mem)
 109 {
 110                 controller->window = kcalloc(2, sizeof(struct pci_window),
 111                                              GFP_KERNEL);
 112                 if (controller->window == NULL)
 113                         BUG();
 114                 controller->window[0].offset = legacy_io;
 115                 controller->window[0].resource.name = "legacy_io";
 116                 controller->window[0].resource.flags = IORESOURCE_IO;
 117                 controller->window[0].resource.start = legacy_io;
 118                 controller->window[0].resource.end =
 119                                 controller->window[0].resource.start + 0xffff;
 120                 controller->window[0].resource.parent = &ioport_resource;
 121                 controller->window[1].offset = legacy_mem;
 122                 controller->window[1].resource.name = "legacy_mem";
 123                 controller->window[1].resource.flags = IORESOURCE_MEM;
 124                 controller->window[1].resource.start = legacy_mem;
 125                 controller->window[1].resource.end =
 126                        controller->window[1].resource.start + (1024 * 1024) - 1;
 127                 controller->window[1].resource.parent = &iomem_resource;
 128                 controller->windows = 2;
 129 }
 130
 131 /*
 132  * sn_pci_window_fixup() - Create a pci_window for each device resource.
 133  *                         It will setup pci_windows for use by
 134  *                         pcibios_bus_to_resource(), pcibios_resource_to_bus(),
 135  *                         etc.
 136  */
 137 static void
 138 sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
 139                     s64 * pci_addrs)
 140 {
 141         struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
 142         unsigned int i;
 143         unsigned int idx;
 144         unsigned int new_count;
 145         struct pci_window *new_window;
 146
 147         if (count == 0)
 148                 return;
 149         idx = controller->windows;
 150         new_count = controller->windows + count;
 151         new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
 152         if (new_window == NULL)
 153                 BUG();
 154         if (controller->window) {
 155                 memcpy(new_window, controller->window,
 156                        sizeof(struct pci_window) * controller->windows);
 157                 kfree(controller->window);
 158         }
 159
 160         /* Setup a pci_window for each device resource. */
 161         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
 162                 if (pci_addrs[i] == -1)
 163                         continue;
 164
 165                 new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
 166                 new_window[idx].resource = dev->resource[i];
 167                 idx++;
 168         }
 169
 170         controller->windows = new_count;
 171         controller->window = new_window;
 172 }
 173
 174 /*
 175  * sn_more_slot_fixup() - We are not running with an ACPI capable PROM,
 176  *                        and need to convert the pci_dev->resource
 177  *                        'start' and 'end' addresses to mapped addresses,
 178  *                        and setup the pci_controller->window array entries.
 179  */
 180 void
 181 sn_more_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
 182 {
 183         unsigned int count = 0;
 184         int idx;
 185         s64 pci_addrs[PCI_ROM_RESOURCE + 1];
 186         unsigned long addr, end, size, start;
 187
 188         /* Copy over PIO Mapped Addresses */
 189         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
 190
 191                 if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
 192                         pci_addrs[idx] = -1;
 193                         continue;
 194                 }
 195
 196                 start = dev->resource[idx].start;
 197                 end = dev->resource[idx].end;
 198                 size = end - start;
 199                 if (size == 0) {
 200                         pci_addrs[idx] = -1;
 201                         continue;
 202                 }
 203                 pci_addrs[idx] = start;
 204                 count++;
 205                 addr = pcidev_info->pdi_pio_mapped_addr[idx];
 206                 addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
 207                 dev->resource[idx].start = addr;
 208                 dev->resource[idx].end = addr + size;
 209                 if (dev->resource[idx].flags & IORESOURCE_IO)
 210                         dev->resource[idx].parent = &ioport_resource;
 211                 else
 212                         dev->resource[idx].parent = &iomem_resource;
 213                 /* If ROM, mark as shadowed in PROM */
 214                 if (idx == PCI_ROM_RESOURCE)
 215                         dev->resource[idx].flags |= IORESOURCE_ROM_BIOS_COPY;
 216         }
 217         /* Create a pci_window in the pci_controller struct for
 218          * each device resource.
 219          */
 220         if (count > 0)
 221                 sn_pci_window_fixup(dev, count, pci_addrs);
 222 }
 223
 224 /*
 225  * sn_pci_controller_fixup() - This routine sets up a bus's resources
 226  *                             consistent with the Linux PCI abstraction layer.
 227  */
 228 static void
 229 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 230 {
 231         s64 status = 0;
 232         struct pci_controller *controller;
 233         struct pcibus_bussoft *prom_bussoft_ptr;
 234
 235
 236         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 237                                      (u64) ia64_tpa(&prom_bussoft_ptr));
 238         if (status > 0)
 239                 return;         /*bus # does not exist */
 240         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 241
 242         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 243         if (!controller)
 244                 BUG();
 245         controller->segment = segment;
 246
 247         /*
 248          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
 249          * (platform_data will be overwritten later in sn_common_bus_fixup())
 250          */
 251         controller->platform_data = prom_bussoft_ptr;
 252
 253         bus = pci_scan_bus(busnum, &pci_root_ops, controller);
 254         if (bus == NULL)
 255                 goto error_return; /* error, or bus already scanned */
 256
 257         bus->sysdata = controller;
 258
 259         return;
 260
 261 error_return:
 262
 263         kfree(controller);
 264         return;
 265 }
 266
 267 /*
 268  * sn_bus_fixup
 269  */
 270 void
 271 sn_bus_fixup(struct pci_bus *bus)
 272 {
 273         struct pci_dev *pci_dev = NULL;
 274         struct pcibus_bussoft *prom_bussoft_ptr;
 275         extern void sn_common_bus_fixup(struct pci_bus *,
 276                                         struct pcibus_bussoft *);
 277
 278
 279         if (!bus->parent) {  /* If root bus */
 280                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
 281                 if (prom_bussoft_ptr == NULL) {
 282                         printk(KERN_ERR
 283                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
 284                                "obtain prom_bussoft_ptr\n",
 285                                pci_domain_nr(bus), bus->number);
 286                         return;
 287                 }
 288                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 289                 sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
 290                                            prom_bussoft_ptr->bs_legacy_io,
 291                                            prom_bussoft_ptr->bs_legacy_mem);
 292         }
 293         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 294                 sn_pci_fixup_slot(pci_dev);
 295         }
 296
 297 }
 298
 299 /*
 300  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 301  *              so we need to do things the hard way, including initiating the
 302  *              bus scanning ourselves.
 303  */
 304
 305 void __init sn_io_init(void)
 306 {
 307         int i, j;
 308
 309         sn_fixup_ionodes();
 310
 311         /* busses are not known yet ... */
 312         for (i = 0; i <= max_segment_number; i++)
 313                 for (j = 0; j <= max_pcibus_number; j++)
 314                         sn_pci_controller_fixup(i, j, NULL);
 315 }