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io_init.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/slab.h>
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/io.h>
#include <asm/sn/module.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/sn_sal.h>
#include "xtalk/hubdev.h"

/*
 * The code in this file will only be executed when running with
 * a PROM that does _not_ have base ACPI IO support.
 * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
 */

static int max_segment_number;             /* Default highest segment number */
static int max_pcibus_number = 255; /* Default highest pci bus number */


/*
 * Retrieve the hub device info structure for the given nasid.
 */
static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
{
      struct ia64_sal_retval ret_stuff;
      ret_stuff.status = 0;
      ret_stuff.v0 = 0;

      SAL_CALL_NOLOCK(ret_stuff,
                  (u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
                  (u64) handle, (u64) address, 0, 0, 0, 0, 0);
      return ret_stuff.v0;
}

/*
 * Retrieve the pci bus information given the bus number.
 */
static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
{
      struct ia64_sal_retval ret_stuff;
      ret_stuff.status = 0;
      ret_stuff.v0 = 0;

      SAL_CALL_NOLOCK(ret_stuff,
                  (u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
                  (u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
      return ret_stuff.v0;
}

/*
 * Retrieve the pci device information given the bus and device|function number.
 */
static inline u64
sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
                u64 sn_irq_info)
{
      struct ia64_sal_retval ret_stuff;
      ret_stuff.status = 0;
      ret_stuff.v0 = 0;

      SAL_CALL_NOLOCK(ret_stuff,
                  (u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
                  (u64) segment, (u64) bus_number, (u64) devfn,
                  (u64) pci_dev,
                  sn_irq_info, 0, 0);
      return ret_stuff.v0;
}


/*
 * sn_fixup_ionodes() - This routine initializes the HUB data structure for
 *                each node in the system. This function is only
 *                executed when running with a non-ACPI capable PROM.
 */
static void __init sn_fixup_ionodes(void)
{

      struct hubdev_info *hubdev;
      u64 status;
      u64 nasid;
      int i;
      extern void sn_common_hubdev_init(struct hubdev_info *);

      /*
       * Get SGI Specific HUB chipset information.
       * Inform Prom that this kernel can support domain bus numbering.
       */
      for (i = 0; i < num_cnodes; i++) {
            hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
            nasid = cnodeid_to_nasid(i);
            hubdev->max_segment_number = 0xffffffff;
            hubdev->max_pcibus_number = 0xff;
            status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
            if (status)
                  continue;

            /* Save the largest Domain and pcibus numbers found. */
            if (hubdev->max_segment_number) {
                  /*
                   * Dealing with a Prom that supports segments.
                   */
                  max_segment_number = hubdev->max_segment_number;
                  max_pcibus_number = hubdev->max_pcibus_number;
            }
            sn_common_hubdev_init(hubdev);
      }
}

/*
 * sn_pci_legacy_window_fixup - Create PCI controller windows for
 *                      legacy IO and MEM space. This needs to
 *                      be done here, as the PROM does not have
 *                      ACPI support defining the root buses
 *                      and their resources (_CRS),
 */
static void
sn_legacy_pci_window_fixup(struct pci_controller *controller,
                     u64 legacy_io, u64 legacy_mem)
{
            controller->window = kcalloc(2, sizeof(struct pci_window),
                                   GFP_KERNEL);
            BUG_ON(controller->window == NULL);
            controller->window[0].offset = legacy_io;
            controller->window[0].resource.name = "legacy_io";
            controller->window[0].resource.flags = IORESOURCE_IO;
            controller->window[0].resource.start = legacy_io;
            controller->window[0].resource.end =
                        controller->window[0].resource.start + 0xffff;
            controller->window[0].resource.parent = &ioport_resource;
            controller->window[1].offset = legacy_mem;
            controller->window[1].resource.name = "legacy_mem";
            controller->window[1].resource.flags = IORESOURCE_MEM;
            controller->window[1].resource.start = legacy_mem;
            controller->window[1].resource.end =
                   controller->window[1].resource.start + (1024 * 1024) - 1;
            controller->window[1].resource.parent = &iomem_resource;
            controller->windows = 2;
}

/*
 * sn_pci_window_fixup() - Create a pci_window for each device resource.
 *                   It will setup pci_windows for use by
 *                   pcibios_bus_to_resource(), pcibios_resource_to_bus(),
 *                   etc.
 */
static void
sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
                s64 * pci_addrs)
{
      struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
      unsigned int i;
      unsigned int idx;
      unsigned int new_count;
      struct pci_window *new_window;

      if (count == 0)
            return;
      idx = controller->windows;
      new_count = controller->windows + count;
      new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
      BUG_ON(new_window == NULL);
      if (controller->window) {
            memcpy(new_window, controller->window,
                   sizeof(struct pci_window) * controller->windows);
            kfree(controller->window);
      }

      /* Setup a pci_window for each device resource. */
      for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
            if (pci_addrs[i] == -1)
                  continue;

            new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
            new_window[idx].resource = dev->resource[i];
            idx++;
      }

      controller->windows = new_count;
      controller->window = new_window;
}

/*
 * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
 *                  and need to convert the pci_dev->resource
 *                  'start' and 'end' addresses to mapped addresses,
 *                  and setup the pci_controller->window array entries.
 */
void
sn_io_slot_fixup(struct pci_dev *dev)
{
      unsigned int count = 0;
      int idx;
      s64 pci_addrs[PCI_ROM_RESOURCE + 1];
      unsigned long addr, end, size, start;
      struct pcidev_info *pcidev_info;
      struct sn_irq_info *sn_irq_info;
      int status;

      pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
      if (!pcidev_info)
            panic("%s: Unable to alloc memory for pcidev_info", __func__);

      sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
      if (!sn_irq_info)
            panic("%s: Unable to alloc memory for sn_irq_info", __func__);

      /* Call to retrieve pci device information needed by kernel. */
      status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
            (u64) dev->bus->number,
            dev->devfn,
            (u64) __pa(pcidev_info),
            (u64) __pa(sn_irq_info));

      BUG_ON(status); /* Cannot get platform pci device information */


      /* Copy over PIO Mapped Addresses */
      for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {

            if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
                  pci_addrs[idx] = -1;
                  continue;
            }

            start = dev->resource[idx].start;
            end = dev->resource[idx].end;
            size = end - start;
            if (size == 0) {
                  pci_addrs[idx] = -1;
                  continue;
            }
            pci_addrs[idx] = start;
            count++;
            addr = pcidev_info->pdi_pio_mapped_addr[idx];
            addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
            dev->resource[idx].start = addr;
            dev->resource[idx].end = addr + size;

            /*
             * if it's already in the device structure, remove it before
             * inserting
             */
            if (dev->resource[idx].parent && dev->resource[idx].parent->child)
                  release_resource(&dev->resource[idx]);

            if (dev->resource[idx].flags & IORESOURCE_IO)
                  insert_resource(&ioport_resource, &dev->resource[idx]);
            else
                  insert_resource(&iomem_resource, &dev->resource[idx]);
            /*
             * If ROM, set the actual ROM image size, and mark as
             * shadowed in PROM.
             */
            if (idx == PCI_ROM_RESOURCE) {
                  size_t image_size;
                  void __iomem *rom;

                  rom = ioremap(pci_resource_start(dev, PCI_ROM_RESOURCE),
                              size + 1);
                  image_size = pci_get_rom_size(dev, rom, size + 1);
                  dev->resource[PCI_ROM_RESOURCE].end =
                        dev->resource[PCI_ROM_RESOURCE].start +
                        image_size - 1;
                  dev->resource[PCI_ROM_RESOURCE].flags |=
                                     IORESOURCE_ROM_BIOS_COPY;
            }
      }
      /* Create a pci_window in the pci_controller struct for
       * each device resource.
       */
      if (count > 0)
            sn_pci_window_fixup(dev, count, pci_addrs);

      sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
}

EXPORT_SYMBOL(sn_io_slot_fixup);

/*
 * sn_pci_controller_fixup() - This routine sets up a bus's resources
 *                       consistent with the Linux PCI abstraction layer.
 */
static void __init
sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
{
      s64 status = 0;
      struct pci_controller *controller;
      struct pcibus_bussoft *prom_bussoft_ptr;


      status = sal_get_pcibus_info((u64) segment, (u64) busnum,
                             (u64) ia64_tpa(&prom_bussoft_ptr));
      if (status > 0)
            return;           /*bus # does not exist */
      prom_bussoft_ptr = __va(prom_bussoft_ptr);

      controller = kzalloc(sizeof(*controller), GFP_KERNEL);
      BUG_ON(!controller);
      controller->segment = segment;

      /*
       * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
       * (platform_data will be overwritten later in sn_common_bus_fixup())
       */
      controller->platform_data = prom_bussoft_ptr;

      bus = pci_scan_bus(busnum, &pci_root_ops, controller);
      if (bus == NULL)
            goto error_return; /* error, or bus already scanned */

      bus->sysdata = controller;

      return;

error_return:

      kfree(controller);
      return;
}

/*
 * sn_bus_fixup
 */
void
sn_bus_fixup(struct pci_bus *bus)
{
      struct pci_dev *pci_dev = NULL;
      struct pcibus_bussoft *prom_bussoft_ptr;

      if (!bus->parent) {  /* If root bus */
            prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
            if (prom_bussoft_ptr == NULL) {
                  printk(KERN_ERR
                         "sn_bus_fixup: 0x%04x:0x%02x Unable to "
                         "obtain prom_bussoft_ptr\n",
                         pci_domain_nr(bus), bus->number);
                  return;
            }
            sn_common_bus_fixup(bus, prom_bussoft_ptr);
            sn_legacy_pci_window_fixup(PCI_CONTROLLER(bus),
                                 prom_bussoft_ptr->bs_legacy_io,
                                 prom_bussoft_ptr->bs_legacy_mem);
        }
        list_for_each_entry(pci_dev, &bus->devices, bus_list) {
                sn_io_slot_fixup(pci_dev);
        }

}

/*
 * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 *          so we need to do things the hard way, including initiating the
 *          bus scanning ourselves.
 */

void __init sn_io_init(void)
{
      int i, j;

      sn_fixup_ionodes();

      /* busses are not known yet ... */
      for (i = 0; i <= max_segment_number; i++)
            for (j = 0; j <= max_pcibus_number; j++)
                  sn_pci_controller_fixup(i, j, NULL);
}

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