arch/ia64/sn/kernel/io_acpi_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) 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/pcidev.h>
  12 #include <asm/sn/pcibus_provider_defs.h>
  13 #include <asm/sn/sn_sal.h>
  14 #include "xtalk/hubdev.h"
  15 #include <linux/acpi.h>
  16
  17
  18 /*
  19  * The code in this file will only be executed when running with
  20  * a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
  21  */
  22
  23
  24 /*
  25  * This value must match the UUID the PROM uses
  26  * (io/acpi/defblk.c) when building a vendor descriptor.
  27  */
  28 struct acpi_vendor_uuid sn_uuid = {
  29         .subtype = 0,
  30         .data   = { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
  31                     0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
  32 };
  33
  34 /*
  35  * Perform the early IO init in PROM.
  36  */
  37 static s64
  38 sal_ioif_init(u64 *result)
  39 {
  40         struct ia64_sal_retval isrv = {0,0,0,0};
  41
  42         SAL_CALL_NOLOCK(isrv,
  43                         SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
  44         *result = isrv.v0;
  45         return isrv.status;
  46 }
  47
  48 /*
  49  * sn_hubdev_add - The 'add' function of the acpi_sn_hubdev_driver.
  50  *                 Called for every "SGIHUB" or "SGITIO" device defined
  51  *                 in the ACPI namespace.
  52  */
  53 static int __init
  54 sn_hubdev_add(struct acpi_device *device)
  55 {
  56         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  57         u64 addr;
  58         struct hubdev_info *hubdev;
  59         struct hubdev_info *hubdev_ptr;
  60         int i;
  61         u64 nasid;
  62         struct acpi_resource *resource;
  63         int ret = 0;
  64         acpi_status status;
  65         struct acpi_resource_vendor_typed *vendor;
  66         extern void sn_common_hubdev_init(struct hubdev_info *);
  67
  68         status = acpi_get_vendor_resource(device->handle, METHOD_NAME__CRS,
  69                                           &sn_uuid, &buffer);
  70         if (ACPI_FAILURE(status)) {
  71                 printk(KERN_ERR
  72                        "sn_hubdev_add: acpi_get_vendor_resource() failed: %d\n",
  73                         status);
  74                 return 1;
  75         }
  76
  77         resource = buffer.pointer;
  78         vendor = &resource->data.vendor_typed;
  79         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
  80             sizeof(struct hubdev_info *)) {
  81                 printk(KERN_ERR
  82                        "sn_hubdev_add: Invalid vendor data length: %d\n",
  83                         vendor->byte_length);
  84                 ret = 1;
  85                 goto exit;
  86         }
  87
  88         memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
  89         hubdev_ptr = __va((struct hubdev_info *) addr);
  90
  91         nasid = hubdev_ptr->hdi_nasid;
  92         i = nasid_to_cnodeid(nasid);
  93         hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
  94         *hubdev = *hubdev_ptr;
  95         sn_common_hubdev_init(hubdev);
  96
  97 exit:
  98         kfree(buffer.pointer);
  99         return ret;
 100 }
 101
 102 /*
 103  * sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
 104  *                        the ACPI Vendor resource for this bus.
 105  */
 106 static struct pcibus_bussoft *
 107 sn_get_bussoft_ptr(struct pci_bus *bus)
 108 {
 109         u64 addr;
 110         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 111         acpi_handle handle;
 112         struct pcibus_bussoft *prom_bussoft_ptr;
 113         struct acpi_resource *resource;
 114         acpi_status status;
 115         struct acpi_resource_vendor_typed *vendor;
 116
 117
 118         handle = PCI_CONTROLLER(bus)->acpi_handle;
 119         status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 120                                           &sn_uuid, &buffer);
 121         if (ACPI_FAILURE(status)) {
 122                 printk(KERN_ERR "get_acpi_pcibus_ptr: "
 123                        "get_acpi_bussoft_info() failed: %d\n",
 124                        status);
 125                 return NULL;
 126         }
 127         resource = buffer.pointer;
 128         vendor = &resource->data.vendor_typed;
 129
 130         if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 131              sizeof(struct pcibus_bussoft *)) {
 132                 printk(KERN_ERR
 133                        "get_acpi_bussoft_ptr: Invalid vendor data "
 134                        "length %d\n", vendor->byte_length);
 135                 kfree(buffer.pointer);
 136                 return NULL;
 137         }
 138         memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
 139         prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
 140         kfree(buffer.pointer);
 141
 142         return prom_bussoft_ptr;
 143 }
 144
 145 /*
 146  * sn_acpi_bus_fixup
 147  */
 148 void
 149 sn_acpi_bus_fixup(struct pci_bus *bus)
 150 {
 151         struct pci_dev *pci_dev = NULL;
 152         struct pcibus_bussoft *prom_bussoft_ptr;
 153         extern void sn_common_bus_fixup(struct pci_bus *,
 154                                         struct pcibus_bussoft *);
 155
 156         if (!bus->parent) {     /* If root bus */
 157                 prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
 158                 if (prom_bussoft_ptr == NULL) {
 159                         printk(KERN_ERR
 160                                "sn_pci_fixup_bus: 0x%04x:0x%02x Unable to "
 161                                "obtain prom_bussoft_ptr\n",
 162                                pci_domain_nr(bus), bus->number);
 163                         return;
 164                 }
 165                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
 166         }
 167         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
 168                 sn_pci_fixup_slot(pci_dev);
 169         }
 170 }
 171
 172 /*
 173  * sn_acpi_slot_fixup - Perform any SN specific slot fixup.
 174  *                      At present there does not appear to be
 175  *                      any generic way to handle a ROM image
 176  *                      that has been shadowed by the PROM, so
 177  *                      we pass a pointer to it within the
 178  *                      pcidev_info structure.
 179  */
 180
 181 void
 182 sn_acpi_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
 183 {
 184         void __iomem *addr;
 185         size_t size;
 186
 187         if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
 188                 /*
 189                  * A valid ROM image exists and has been shadowed by the
 190                  * PROM. Setup the pci_dev ROM resource to point to
 191                  * the shadowed copy.
 192                  */
 193                 size = dev->resource[PCI_ROM_RESOURCE].end -
 194                                 dev->resource[PCI_ROM_RESOURCE].start;
 195                 addr =
 196                      ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
 197                              size);
 198                 dev->resource[PCI_ROM_RESOURCE].start = (unsigned long) addr;
 199                 dev->resource[PCI_ROM_RESOURCE].end =
 200                                                 (unsigned long) addr + size;
 201                 dev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_BIOS_COPY;
 202         }
 203 }
 204
 205 static struct acpi_driver acpi_sn_hubdev_driver = {
 206         .name = "SGI HUBDEV Driver",
 207         .ids = "SGIHUB,SGITIO",
 208         .ops = {
 209                 .add = sn_hubdev_add,
 210                 },
 211 };
 212
 213
 214 /*
 215  * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
 216  *                   nodes and root buses in the DSDT. As a result, bus scanning
 217  *                   will be initiated by the Linux ACPI code.
 218  */
 219
 220 void __init
 221 sn_io_acpi_init(void)
 222 {
 223         u64 result;
 224         s64 status;
 225
 226         /* SN Altix does not follow the IOSAPIC IRQ routing model */
 227         acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
 228
 229         acpi_bus_register_driver(&acpi_sn_hubdev_driver);
 230         status = sal_ioif_init(&result);
 231         if (status || result)
 232                 panic("sal_ioif_init failed: [%lx] %s\n",
 233                       status, ia64_sal_strerror(status));
 234 }