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 - Setup PCI resources 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 resource *res,
 129                 u64 legacy_io, u64 legacy_mem)
 130 {
 131                 res[0].name = "legacy_io";
 132                 res[0].flags = IORESOURCE_IO;
 133                 res[0].start = legacy_io;
 134                 res[0].end = res[0].start + 0xffff;
 135                 res[0].parent = &ioport_resource;
 136                 res[1].name = "legacy_mem";
 137                 res[1].flags = IORESOURCE_MEM;
 138                 res[1].start = legacy_mem;
 139                 res[1].end = res[1].start + (1024 * 1024) - 1;
 140                 res[1].parent = &iomem_resource;
 141 }
 142
 143 /*
 144  * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
 145  *                        and need to convert the pci_dev->resource
 146  *                        'start' and 'end' addresses to mapped addresses,
 147  *                        and setup the pci_controller->window array entries.
 148  */
 149 void
 150 sn_io_slot_fixup(struct pci_dev *dev)
 151 {
 152         int idx;
 153         struct resource *res;
 154         unsigned long addr, size;
 155         struct pcidev_info *pcidev_info;
 156         struct sn_irq_info *sn_irq_info;
 157         int status;
 158
 159         pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 160         if (!pcidev_info)
 161                 panic("%s: Unable to alloc memory for pcidev_info", __func__);
 162
 163         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 164         if (!sn_irq_info)
 165                 panic("%s: Unable to alloc memory for sn_irq_info", __func__);
 166
 167         /* Call to retrieve pci device information needed by kernel. */
 168         status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
 169                 (u64) dev->bus->number,
 170                 dev->devfn,
 171                 (u64) __pa(pcidev_info),
 172                 (u64) __pa(sn_irq_info));
 173
 174         BUG_ON(status); /* Cannot get platform pci device information */
 175
 176
 177         /* Copy over PIO Mapped Addresses */
 178         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
 179                 if (!pcidev_info->pdi_pio_mapped_addr[idx])
 180                         continue;
 181
 182                 res = &dev->resource[idx];
 183
 184                 size = res->end - res->start;
 185                 if (size == 0)
 186                         continue;
 187
 188                 res->start = pcidev_info->pdi_pio_mapped_addr[idx];
 189                 res->end = addr + size;
 190
 191                 /*
 192                  * if it's already in the device structure, remove it before
 193                  * inserting
 194                  */
 195                 if (res->parent && res->parent->child)
 196                         release_resource(res);
 197
 198                 if (res->flags & IORESOURCE_IO)
 199                         insert_resource(&ioport_resource, res);
 200                 else
 201                         insert_resource(&iomem_resource, res);
 202                 /*
 203                  * If ROM, mark as shadowed in PROM.
 204                  */
 205                 if (idx == PCI_ROM_RESOURCE) {
 206                         pci_disable_rom(dev);
 207                         res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
 208                                      IORESOURCE_PCI_FIXED;
 209                 }
 210         }
 211
 212         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 213 }
 214 EXPORT_SYMBOL(sn_io_slot_fixup);
 215
 216 /*
 217  * sn_pci_controller_fixup() - This routine sets up a bus's resources
 218  *                             consistent with the Linux PCI abstraction layer.
 219  */
 220 static void __init
 221 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 222 {
 223         s64 status = 0;
 224         struct pci_controller *controller;
 225         struct pcibus_bussoft *prom_bussoft_ptr;
 226         struct resource *res;
 227         LIST_HEAD(resources);
 228
 229         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 230                                      (u64) ia64_tpa(&prom_bussoft_ptr));
 231         if (status > 0)
 232                 return;         /*bus # does not exist */
 233         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 234
 235         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 236         BUG_ON(!controller);
 237         controller->segment = segment;
 238
 239         res = kcalloc(2, sizeof(struct resource), GFP_KERNEL);
 240         BUG_ON(!res);
 241
 242         /*
 243          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
 244          * (platform_data will be overwritten later in sn_common_bus_fixup())
 245          */
 246         controller->platform_data = prom_bussoft_ptr;
 247
 248         sn_legacy_pci_window_fixup(res,
 249                         prom_bussoft_ptr->bs_legacy_io,
 250                         prom_bussoft_ptr->bs_legacy_mem);
 251         pci_add_resource_offset(&resources,     &res[0],
 252                         prom_bussoft_ptr->bs_legacy_io);
 253         pci_add_resource_offset(&resources,     &res[1],
 254                         prom_bussoft_ptr->bs_legacy_mem);
 255
 256         bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, controller,
 257                                 &resources);
 258         if (bus == NULL) {
 259                 kfree(res);
 260                 kfree(controller);
 261                 return;
 262         }
 263         pci_bus_add_devices(bus);
 264 }
 265
 266 /*
 267  * sn_bus_fixup
 268  */
 269 void
 270 sn_bus_fixup(struct pci_bus *bus)
 271 {
 272         struct pci_dev *pci_dev = NULL;
 273         struct pcibus_bussoft *prom_bussoft_ptr;
 274
 275         if (!bus->parent) {  /* If root bus */
 276                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
 277                 if (prom_bussoft_ptr == NULL) {
 278                         printk(KERN_ERR
 279                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
 280                                "obtain prom_bussoft_ptr\n",
 281                                pci_domain_nr(bus), bus->number);
 282                         return;
 283                 }
 284                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 285         }
 286         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 287                 sn_io_slot_fixup(pci_dev);
 288         }
 289
 290 }
 291
 292 /*
 293  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 294  *              so we need to do things the hard way, including initiating the
 295  *              bus scanning ourselves.
 296  */
 297
 298 void __init sn_io_init(void)
 299 {
 300         int i, j;
 301
 302         sn_fixup_ionodes();
 303
 304         /* busses are not known yet ... */
 305         for (i = 0; i <= max_segment_number; i++)
 306                 for (j = 0; j <= max_pcibus_number; j++)
 307                         sn_pci_controller_fixup(i, j, NULL);
 308 }