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io_common.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) 2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/bootmem.h>
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/sn_feature_sets.h>
#include <asm/sn/geo.h>
#include <asm/sn/io.h>
#include <asm/sn/l1.h>
#include <asm/sn/module.h>
#include <asm/sn/pcibr_provider.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/simulator.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/tioca_provider.h>
#include <asm/sn/tioce_provider.h>
#include "xtalk/hubdev.h"
#include "xtalk/xwidgetdev.h"
#include <linux/acpi.h>
#include <asm/sn/sn2/sn_hwperf.h>
#include <asm/sn/acpi.h>
#include "acpi/acglobal.h"

extern void sn_init_cpei_timer(void);
extern void register_sn_procfs(void);
extern void sn_io_acpi_init(void);
extern void sn_io_init(void);


static struct list_head sn_sysdata_list;

/* sysdata list struct */
00040 struct sysdata_el {
      struct list_head entry;
      void *sysdata;
};

int sn_ioif_inited;           /* SN I/O infrastructure initialized? */

int sn_acpi_rev;        /* SN ACPI revision */
EXPORT_SYMBOL_GPL(sn_acpi_rev);

struct sn_pcibus_provider *sn_pci_provider[PCIIO_ASIC_MAX_TYPES]; /* indexed by asic type */

/*
 * Hooks and struct for unsupported pci providers
 */

static dma_addr_t
sn_default_pci_map(struct pci_dev *pdev, unsigned long paddr, size_t size, int type)
{
      return 0;
}

static void
sn_default_pci_unmap(struct pci_dev *pdev, dma_addr_t addr, int direction)
{
      return;
}

static void *
sn_default_pci_bus_fixup(struct pcibus_bussoft *soft, struct pci_controller *controller)
{
      return NULL;
}

static struct sn_pcibus_provider sn_pci_default_provider = {
      .dma_map = sn_default_pci_map,
      .dma_map_consistent = sn_default_pci_map,
      .dma_unmap = sn_default_pci_unmap,
      .bus_fixup = sn_default_pci_bus_fixup,
};

/*
 * Retrieve the DMA Flush List given nasid, widget, and device.
 * This list is needed to implement the WAR - Flush DMA data on PIO Reads.
 */
static inline u64
sal_get_device_dmaflush_list(u64 nasid, u64 widget_num, u64 device_num,
                       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_DEVICE_DMAFLUSH_LIST,
                  (u64) nasid, (u64) widget_num,
                  (u64) device_num, (u64) address, 0, 0, 0);
      return ret_stuff.status;
}

/*
 * sn_pcidev_info_get() - Retrieve the pcidev_info struct for the specified
 *                  device.
 */
inline struct pcidev_info *
sn_pcidev_info_get(struct pci_dev *dev)
{
      struct pcidev_info *pcidev;

      list_for_each_entry(pcidev,
                      &(SN_PLATFORM_DATA(dev)->pcidev_info), pdi_list) {
            if (pcidev->pdi_linux_pcidev == dev)
                  return pcidev;
      }
      return NULL;
}

/* Older PROM flush WAR
 *
 * 01/16/06 -- This war will be in place until a new official PROM is released.
 * Additionally note that the struct sn_flush_device_war also has to be
 * removed from arch/ia64/sn/include/xtalk/hubdev.h
 */
static u8 war_implemented = 0;

static s64 sn_device_fixup_war(u64 nasid, u64 widget, int device,
                         struct sn_flush_device_common *common)
{
      struct sn_flush_device_war *war_list;
      struct sn_flush_device_war *dev_entry;
      struct ia64_sal_retval isrv = {0,0,0,0};

      if (!war_implemented) {
            printk(KERN_WARNING "PROM version < 4.50 -- implementing old "
                   "PROM flush WAR\n");
            war_implemented = 1;
      }

      war_list = kzalloc(DEV_PER_WIDGET * sizeof(*war_list), GFP_KERNEL);
      if (!war_list)
            BUG();

      SAL_CALL_NOLOCK(isrv, SN_SAL_IOIF_GET_WIDGET_DMAFLUSH_LIST,
                  nasid, widget, __pa(war_list), 0, 0, 0 ,0);
      if (isrv.status)
            panic("sn_device_fixup_war failed: %s\n",
                  ia64_sal_strerror(isrv.status));

      dev_entry = war_list + device;
      memcpy(common,dev_entry, sizeof(*common));
      kfree(war_list);

      return isrv.status;
}

/*
 * sn_common_hubdev_init() - This routine is called to initialize the HUB data
 *                     structure for each node in the system.
 */
void __init
sn_common_hubdev_init(struct hubdev_info *hubdev)
{

      struct sn_flush_device_kernel *sn_flush_device_kernel;
      struct sn_flush_device_kernel *dev_entry;
      s64 status;
      int widget, device, size;

      /* Attach the error interrupt handlers */
      if (hubdev->hdi_nasid & 1)    /* If TIO */
            ice_error_init(hubdev);
      else
            hub_error_init(hubdev);

      for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++)
            hubdev->hdi_xwidget_info[widget].xwi_hubinfo = hubdev;

      if (!hubdev->hdi_flush_nasid_list.widget_p)
            return;

      size = (HUB_WIDGET_ID_MAX + 1) *
            sizeof(struct sn_flush_device_kernel *);
      hubdev->hdi_flush_nasid_list.widget_p =
            kzalloc(size, GFP_KERNEL);
      if (!hubdev->hdi_flush_nasid_list.widget_p)
            BUG();

      for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++) {
            size = DEV_PER_WIDGET *
                  sizeof(struct sn_flush_device_kernel);
            sn_flush_device_kernel = kzalloc(size, GFP_KERNEL);
            if (!sn_flush_device_kernel)
                  BUG();

            dev_entry = sn_flush_device_kernel;
            for (device = 0; device < DEV_PER_WIDGET;
                 device++, dev_entry++) {
                  size = sizeof(struct sn_flush_device_common);
                  dev_entry->common = kzalloc(size, GFP_KERNEL);
                  if (!dev_entry->common)
                        BUG();
                  if (sn_prom_feature_available(PRF_DEVICE_FLUSH_LIST))
                        status = sal_get_device_dmaflush_list(
                                   hubdev->hdi_nasid, widget, device,
                                   (u64)(dev_entry->common));
                  else
                        status = sn_device_fixup_war(hubdev->hdi_nasid,
                                               widget, device,
                                               dev_entry->common);
                  if (status != SALRET_OK)
                        panic("SAL call failed: %s\n",
                              ia64_sal_strerror(status));

                  spin_lock_init(&dev_entry->sfdl_flush_lock);
            }

            if (sn_flush_device_kernel)
                  hubdev->hdi_flush_nasid_list.widget_p[widget] =
                                           sn_flush_device_kernel;
      }
}

void sn_pci_unfixup_slot(struct pci_dev *dev)
{
      struct pci_dev *host_pci_dev = SN_PCIDEV_INFO(dev)->host_pci_dev;

      sn_irq_unfixup(dev);
      pci_dev_put(host_pci_dev);
      pci_dev_put(dev);
}

/*
 * sn_pci_fixup_slot()
 */
void sn_pci_fixup_slot(struct pci_dev *dev, struct pcidev_info *pcidev_info,
                   struct sn_irq_info *sn_irq_info)
{
      int segment = pci_domain_nr(dev->bus);
      struct pcibus_bussoft *bs;
      struct pci_bus *host_pci_bus;
      struct pci_dev *host_pci_dev;
      unsigned int bus_no, devfn;

      pci_dev_get(dev); /* for the sysdata pointer */

      /* Add pcidev_info to list in pci_controller.platform_data */
      list_add_tail(&pcidev_info->pdi_list,
                  &(SN_PLATFORM_DATA(dev->bus)->pcidev_info));
      /*
       * Using the PROMs values for the PCI host bus, get the Linux
       * PCI host_pci_dev struct and set up host bus linkages
       */

      bus_no = (pcidev_info->pdi_slot_host_handle >> 32) & 0xff;
      devfn = pcidev_info->pdi_slot_host_handle & 0xffffffff;
      host_pci_bus = pci_find_bus(segment, bus_no);
      host_pci_dev = pci_get_slot(host_pci_bus, devfn);

      pcidev_info->host_pci_dev = host_pci_dev;
      pcidev_info->pdi_linux_pcidev = dev;
      pcidev_info->pdi_host_pcidev_info = SN_PCIDEV_INFO(host_pci_dev);
      bs = SN_PCIBUS_BUSSOFT(dev->bus);
      pcidev_info->pdi_pcibus_info = bs;

      if (bs && bs->bs_asic_type < PCIIO_ASIC_MAX_TYPES) {
            SN_PCIDEV_BUSPROVIDER(dev) = sn_pci_provider[bs->bs_asic_type];
      } else {
            SN_PCIDEV_BUSPROVIDER(dev) = &sn_pci_default_provider;
      }

      /* Only set up IRQ stuff if this device has a host bus context */
      if (bs && sn_irq_info->irq_irq) {
            pcidev_info->pdi_sn_irq_info = sn_irq_info;
            dev->irq = pcidev_info->pdi_sn_irq_info->irq_irq;
            sn_irq_fixup(dev, sn_irq_info);
      } else {
            pcidev_info->pdi_sn_irq_info = NULL;
            kfree(sn_irq_info);
      }
}

/*
 * sn_common_bus_fixup - Perform platform specific bus fixup.
 *                 Execute the ASIC specific fixup routine
 *                 for this bus.
 */
void
sn_common_bus_fixup(struct pci_bus *bus,
                struct pcibus_bussoft *prom_bussoft_ptr)
{
      int cnode;
      struct pci_controller *controller;
      struct hubdev_info *hubdev_info;
      int nasid;
      void *provider_soft;
      struct sn_pcibus_provider *provider;
      struct sn_platform_data *sn_platform_data;

      controller = PCI_CONTROLLER(bus);
      /*
       * Per-provider fixup.  Copies the bus soft structure from prom
       * to local area and links SN_PCIBUS_BUSSOFT().
       */

      if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES) {
            printk(KERN_WARNING "sn_common_bus_fixup: Unsupported asic type, %d",
                   prom_bussoft_ptr->bs_asic_type);
            return;
      }

      if (prom_bussoft_ptr->bs_asic_type == PCIIO_ASIC_TYPE_PPB)
            return;     /* no further fixup necessary */

      provider = sn_pci_provider[prom_bussoft_ptr->bs_asic_type];
      if (provider == NULL)
            panic("sn_common_bus_fixup: No provider registered for this asic type, %d",
                  prom_bussoft_ptr->bs_asic_type);

      if (provider->bus_fixup)
            provider_soft = (*provider->bus_fixup) (prom_bussoft_ptr,
                         controller);
      else
            provider_soft = NULL;

      /*
       * Generic bus fixup goes here.  Don't reference prom_bussoft_ptr
       * after this point.
       */
      controller->platform_data = kzalloc(sizeof(struct sn_platform_data),
                                  GFP_KERNEL);
      if (controller->platform_data == NULL)
            BUG();
      sn_platform_data =
                  (struct sn_platform_data *) controller->platform_data;
      sn_platform_data->provider_soft = provider_soft;
      INIT_LIST_HEAD(&((struct sn_platform_data *)
                   controller->platform_data)->pcidev_info);
      nasid = NASID_GET(SN_PCIBUS_BUSSOFT(bus)->bs_base);
      cnode = nasid_to_cnodeid(nasid);
      hubdev_info = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
      SN_PCIBUS_BUSSOFT(bus)->bs_xwidget_info =
          &(hubdev_info->hdi_xwidget_info[SN_PCIBUS_BUSSOFT(bus)->bs_xid]);

      /*
       * If the node information we obtained during the fixup phase is
       * invalid then set controller->node to -1 (undetermined)
       */
      if (controller->node >= num_online_nodes()) {
            struct pcibus_bussoft *b = SN_PCIBUS_BUSSOFT(bus);

            printk(KERN_WARNING "Device ASIC=%u XID=%u PBUSNUM=%u "
                   "L_IO=%lx L_MEM=%lx BASE=%lx\n",
                   b->bs_asic_type, b->bs_xid, b->bs_persist_busnum,
                   b->bs_legacy_io, b->bs_legacy_mem, b->bs_base);
            printk(KERN_WARNING "on node %d but only %d nodes online."
                   "Association set to undetermined.\n",
                   controller->node, num_online_nodes());
            controller->node = -1;
      }
}

void sn_bus_store_sysdata(struct pci_dev *dev)
{
      struct sysdata_el *element;

      element = kzalloc(sizeof(struct sysdata_el), GFP_KERNEL);
      if (!element) {
            dev_dbg(&dev->dev, "%s: out of memory!\n", __func__);
            return;
      }
      element->sysdata = SN_PCIDEV_INFO(dev);
      list_add(&element->entry, &sn_sysdata_list);
}

void sn_bus_free_sysdata(void)
{
      struct sysdata_el *element;
      struct list_head *list, *safe;

      list_for_each_safe(list, safe, &sn_sysdata_list) {
            element = list_entry(list, struct sysdata_el, entry);
            list_del(&element->entry);
            list_del(&(((struct pcidev_info *)
                       (element->sysdata))->pdi_list));
            kfree(element->sysdata);
            kfree(element);
      }
      return;
}

/*
 * hubdev_init_node() - Creates the HUB data structure and link them to it's
 *                own NODE specific data area.
 */
void __init hubdev_init_node(nodepda_t * npda, cnodeid_t node)
{
      struct hubdev_info *hubdev_info;
      int size;
      pg_data_t *pg;

      size = sizeof(struct hubdev_info);

      if (node >= num_online_nodes())     /* Headless/memless IO nodes */
            pg = NODE_DATA(0);
      else
            pg = NODE_DATA(node);

      hubdev_info = (struct hubdev_info *)alloc_bootmem_node(pg, size);

      npda->pdinfo = (void *)hubdev_info;
}

geoid_t
cnodeid_get_geoid(cnodeid_t cnode)
{
      struct hubdev_info *hubdev;

      hubdev = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
      return hubdev->hdi_geoid;
}

void sn_generate_path(struct pci_bus *pci_bus, char *address)
{
      nasid_t nasid;
      cnodeid_t cnode;
      geoid_t geoid;
      moduleid_t moduleid;
      u16 bricktype;

      nasid = NASID_GET(SN_PCIBUS_BUSSOFT(pci_bus)->bs_base);
      cnode = nasid_to_cnodeid(nasid);
      geoid = cnodeid_get_geoid(cnode);
      moduleid = geo_module(geoid);

      sprintf(address, "module_%c%c%c%c%.2d",
            '0'+RACK_GET_CLASS(MODULE_GET_RACK(moduleid)),
            '0'+RACK_GET_GROUP(MODULE_GET_RACK(moduleid)),
            '0'+RACK_GET_NUM(MODULE_GET_RACK(moduleid)),
            MODULE_GET_BTCHAR(moduleid), MODULE_GET_BPOS(moduleid));

      /* Tollhouse requires slot id to be displayed */
      bricktype = MODULE_GET_BTYPE(moduleid);
      if ((bricktype == L1_BRICKTYPE_191010) ||
          (bricktype == L1_BRICKTYPE_1932))
                  sprintf(address, "%s^%d", address, geo_slot(geoid));
}

void __devinit
sn_pci_fixup_bus(struct pci_bus *bus)
{

      if (SN_ACPI_BASE_SUPPORT())
            sn_acpi_bus_fixup(bus);
      else
            sn_bus_fixup(bus);
}

/*
 * sn_io_early_init - Perform early IO (and some non-IO) initialization.
 *                In particular, setup the sn_pci_provider[] array.
 *                This needs to be done prior to any bus scanning
 *                (acpi_scan_init()) in the ACPI case, as the SN
 *                bus fixup code will reference the array.
 */
static int __init
sn_io_early_init(void)
{
      int i;

      if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
            return 0;

      /* we set the acpi revision to that of the DSDT table OEM rev. */
      {
            struct acpi_table_header *header = NULL;

            acpi_get_table_by_index(ACPI_TABLE_INDEX_DSDT, &header);
            BUG_ON(header == NULL);
            sn_acpi_rev = header->oem_revision;
      }

      /*
       * prime sn_pci_provider[].  Individual provider init routines will
       * override their respective default entries.
       */

      for (i = 0; i < PCIIO_ASIC_MAX_TYPES; i++)
            sn_pci_provider[i] = &sn_pci_default_provider;

      pcibr_init_provider();
      tioca_init_provider();
      tioce_init_provider();

      /*
       * This is needed to avoid bounce limit checks in the blk layer
       */
      ia64_max_iommu_merge_mask = ~PAGE_MASK;

      sn_irq_lh_init();
      INIT_LIST_HEAD(&sn_sysdata_list);
      sn_init_cpei_timer();

#ifdef CONFIG_PROC_FS
      register_sn_procfs();
#endif

      {
            struct acpi_table_header *header;
            (void)acpi_get_table_by_index(ACPI_TABLE_INDEX_DSDT, &header);
            printk(KERN_INFO "ACPI  DSDT OEM Rev 0x%x\n",
                  header->oem_revision);
      }
      if (SN_ACPI_BASE_SUPPORT())
            sn_io_acpi_init();
      else
            sn_io_init();
      return 0;
}

arch_initcall(sn_io_early_init);

/*
 * sn_io_late_init() - Perform any final platform specific IO initialization.
 */

int __init
sn_io_late_init(void)
{
      struct pci_bus *bus;
      struct pcibus_bussoft *bussoft;
      cnodeid_t cnode;
      nasid_t nasid;
      cnodeid_t near_cnode;

      if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
            return 0;

      /*
       * Setup closest node in pci_controller->node for
       * PIC, TIOCP, TIOCE (TIOCA does it during bus fixup using
       * info from the PROM).
       */
      bus = NULL;
      while ((bus = pci_find_next_bus(bus)) != NULL) {
            bussoft = SN_PCIBUS_BUSSOFT(bus);
            nasid = NASID_GET(bussoft->bs_base);
            cnode = nasid_to_cnodeid(nasid);
            if ((bussoft->bs_asic_type == PCIIO_ASIC_TYPE_TIOCP) ||
                (bussoft->bs_asic_type == PCIIO_ASIC_TYPE_TIOCE) ||
                (bussoft->bs_asic_type == PCIIO_ASIC_TYPE_PIC)) {
                  /* PCI Bridge: find nearest node with CPUs */
                  int e = sn_hwperf_get_nearest_node(cnode, NULL,
                                             &near_cnode);
                  if (e < 0) {
                        near_cnode = (cnodeid_t)-1; /* use any node */
                        printk(KERN_WARNING "sn_io_late_init: failed "
                               "to find near node with CPUs for "
                               "node %d, err=%d\n", cnode, e);
                  }
                  PCI_CONTROLLER(bus)->node = near_cnode;
            }
      }

      sn_ioif_inited = 1;     /* SN I/O infrastructure now initialized */

      return 0;
}

fs_initcall(sn_io_late_init);

EXPORT_SYMBOL(sn_pci_unfixup_slot);
EXPORT_SYMBOL(sn_bus_store_sysdata);
EXPORT_SYMBOL(sn_bus_free_sysdata);
EXPORT_SYMBOL(sn_generate_path);


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