309 lines
8 KiB
C
309 lines
8 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <asm/sn/types.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/io.h>
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#include <asm/sn/module.h>
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#include <asm/sn/intr.h>
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#include <asm/sn/pcibus_provider_defs.h>
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#include <asm/sn/pcidev.h>
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#include <asm/sn/sn_sal.h>
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#include "xtalk/hubdev.h"
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/*
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* The code in this file will only be executed when running with
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* a PROM that does _not_ have base ACPI IO support.
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* (i.e., SN_ACPI_BASE_SUPPORT() == 0)
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*/
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static int max_segment_number; /* Default highest segment number */
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static int max_pcibus_number = 255; /* Default highest pci bus number */
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/*
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* Retrieve the hub device info structure for the given nasid.
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*/
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static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff,
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(u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
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(u64) handle, (u64) address, 0, 0, 0, 0, 0);
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return ret_stuff.v0;
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}
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/*
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* Retrieve the pci bus information given the bus number.
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*/
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static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff,
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(u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
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(u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
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return ret_stuff.v0;
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}
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/*
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* Retrieve the pci device information given the bus and device|function number.
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*/
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static inline u64
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sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
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u64 sn_irq_info)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff,
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(u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
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(u64) segment, (u64) bus_number, (u64) devfn,
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(u64) pci_dev,
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sn_irq_info, 0, 0);
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return ret_stuff.v0;
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}
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/*
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* sn_fixup_ionodes() - This routine initializes the HUB data structure for
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* each node in the system. This function is only
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* executed when running with a non-ACPI capable PROM.
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*/
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static void __init sn_fixup_ionodes(void)
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{
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struct hubdev_info *hubdev;
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u64 status;
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u64 nasid;
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int i;
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extern void sn_common_hubdev_init(struct hubdev_info *);
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/*
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* Get SGI Specific HUB chipset information.
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* Inform Prom that this kernel can support domain bus numbering.
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*/
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for (i = 0; i < num_cnodes; i++) {
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hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
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nasid = cnodeid_to_nasid(i);
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hubdev->max_segment_number = 0xffffffff;
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hubdev->max_pcibus_number = 0xff;
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status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
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if (status)
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continue;
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/* Save the largest Domain and pcibus numbers found. */
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if (hubdev->max_segment_number) {
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/*
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* Dealing with a Prom that supports segments.
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*/
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max_segment_number = hubdev->max_segment_number;
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max_pcibus_number = hubdev->max_pcibus_number;
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}
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sn_common_hubdev_init(hubdev);
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}
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}
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/*
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* sn_pci_legacy_window_fixup - Setup PCI resources for
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* legacy IO and MEM space. This needs to
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* be done here, as the PROM does not have
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* ACPI support defining the root buses
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* and their resources (_CRS),
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*/
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static void
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sn_legacy_pci_window_fixup(struct resource *res,
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u64 legacy_io, u64 legacy_mem)
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{
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res[0].name = "legacy_io";
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res[0].flags = IORESOURCE_IO;
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res[0].start = legacy_io;
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res[0].end = res[0].start + 0xffff;
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res[0].parent = &ioport_resource;
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res[1].name = "legacy_mem";
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res[1].flags = IORESOURCE_MEM;
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res[1].start = legacy_mem;
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res[1].end = res[1].start + (1024 * 1024) - 1;
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res[1].parent = &iomem_resource;
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}
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/*
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* sn_io_slot_fixup() - We are not running with an ACPI capable PROM,
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* and need to convert the pci_dev->resource
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* 'start' and 'end' addresses to mapped addresses,
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* and setup the pci_controller->window array entries.
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*/
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void
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sn_io_slot_fixup(struct pci_dev *dev)
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{
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int idx;
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struct resource *res;
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unsigned long size;
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struct pcidev_info *pcidev_info;
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struct sn_irq_info *sn_irq_info;
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int status;
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pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
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if (!pcidev_info)
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panic("%s: Unable to alloc memory for pcidev_info", __func__);
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sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
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if (!sn_irq_info)
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panic("%s: Unable to alloc memory for sn_irq_info", __func__);
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/* Call to retrieve pci device information needed by kernel. */
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status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
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(u64) dev->bus->number,
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dev->devfn,
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(u64) __pa(pcidev_info),
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(u64) __pa(sn_irq_info));
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BUG_ON(status); /* Cannot get platform pci device information */
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/* Copy over PIO Mapped Addresses */
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for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
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if (!pcidev_info->pdi_pio_mapped_addr[idx])
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continue;
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res = &dev->resource[idx];
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size = res->end - res->start;
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if (size == 0)
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continue;
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res->start = pcidev_info->pdi_pio_mapped_addr[idx];
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res->end = res->start + size;
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/*
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* if it's already in the device structure, remove it before
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* inserting
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*/
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if (res->parent && res->parent->child)
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release_resource(res);
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if (res->flags & IORESOURCE_IO)
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insert_resource(&ioport_resource, res);
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else
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insert_resource(&iomem_resource, res);
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/*
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* If ROM, mark as shadowed in PROM.
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*/
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if (idx == PCI_ROM_RESOURCE) {
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pci_disable_rom(dev);
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res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
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IORESOURCE_PCI_FIXED;
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}
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}
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sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
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}
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EXPORT_SYMBOL(sn_io_slot_fixup);
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/*
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* sn_pci_controller_fixup() - This routine sets up a bus's resources
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* consistent with the Linux PCI abstraction layer.
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*/
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static void __init
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sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
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{
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s64 status = 0;
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struct pci_controller *controller;
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struct pcibus_bussoft *prom_bussoft_ptr;
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struct resource *res;
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LIST_HEAD(resources);
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status = sal_get_pcibus_info((u64) segment, (u64) busnum,
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(u64) ia64_tpa(&prom_bussoft_ptr));
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if (status > 0)
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return; /*bus # does not exist */
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prom_bussoft_ptr = __va(prom_bussoft_ptr);
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controller = kzalloc(sizeof(*controller), GFP_KERNEL);
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BUG_ON(!controller);
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controller->segment = segment;
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res = kcalloc(2, sizeof(struct resource), GFP_KERNEL);
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BUG_ON(!res);
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/*
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* Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
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* (platform_data will be overwritten later in sn_common_bus_fixup())
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*/
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controller->platform_data = prom_bussoft_ptr;
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sn_legacy_pci_window_fixup(res,
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prom_bussoft_ptr->bs_legacy_io,
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prom_bussoft_ptr->bs_legacy_mem);
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pci_add_resource_offset(&resources, &res[0],
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prom_bussoft_ptr->bs_legacy_io);
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pci_add_resource_offset(&resources, &res[1],
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prom_bussoft_ptr->bs_legacy_mem);
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bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, controller,
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&resources);
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if (bus == NULL) {
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kfree(res);
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kfree(controller);
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return;
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}
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pci_bus_add_devices(bus);
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}
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/*
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* sn_bus_fixup
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*/
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void
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sn_bus_fixup(struct pci_bus *bus)
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{
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struct pci_dev *pci_dev = NULL;
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struct pcibus_bussoft *prom_bussoft_ptr;
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if (!bus->parent) { /* If root bus */
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prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
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if (prom_bussoft_ptr == NULL) {
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printk(KERN_ERR
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"sn_bus_fixup: 0x%04x:0x%02x Unable to "
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"obtain prom_bussoft_ptr\n",
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pci_domain_nr(bus), bus->number);
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return;
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}
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sn_common_bus_fixup(bus, prom_bussoft_ptr);
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}
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list_for_each_entry(pci_dev, &bus->devices, bus_list) {
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sn_io_slot_fixup(pci_dev);
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}
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}
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/*
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* sn_io_init - PROM does not have ACPI support to define nodes or root buses,
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* so we need to do things the hard way, including initiating the
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* bus scanning ourselves.
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*/
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void __init sn_io_init(void)
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{
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int i, j;
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sn_fixup_ionodes();
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/* busses are not known yet ... */
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for (i = 0; i <= max_segment_number; i++)
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for (j = 0; j <= max_pcibus_number; j++)
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sn_pci_controller_fixup(i, j, NULL);
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}
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