Altix: Initial ACPI support - ROM shadowing.

Support a shadowed ROM when running with an ACPI capable PROM.

Define a new dev.resource flag IORESOURCE_ROM_BIOS_COPY to
describe the case of a BIOS shadowed ROM, which can then
be used to avoid pci_map_rom() making an unneeded call to
pci_enable_rom().


Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 39 insertions, 2 deletions

diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index a9dc36901b19..99d7f278612a 100644
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -169,6 +169,39 @@ sn_acpi_bus_fixup(struct pci_bus *bus)
         }
 }
 
+/*
+ * sn_acpi_slot_fixup - Perform any SN specific slot fixup.
+ *                      At present there does not appear to be
+ *                      any generic way to handle a ROM image
+ *                      that has been shadowed by the PROM, so
+ *                      we pass a pointer to it within the
+ *                      pcidev_info structure.
+ */
+
+void
+sn_acpi_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
+{
+        void __iomem *addr;
+        size_t size;
+
+        if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
+                /*
+                 * A valid ROM image exists and has been shadowed by the
+                 * PROM. Setup the pci_dev ROM resource to point to
+                 * the shadowed copy.
+                 */
+                size = dev->resource[PCI_ROM_RESOURCE].end -
+                                dev->resource[PCI_ROM_RESOURCE].start;
+                addr =
+                     ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
+                             size);
+                dev->resource[PCI_ROM_RESOURCE].start = (unsigned long) addr;
+                dev->resource[PCI_ROM_RESOURCE].end =
+                                                (unsigned long) addr + size;
+                dev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_BIOS_COPY;
+        }
+}
+
 static struct acpi_driver acpi_sn_hubdev_driver = {
         .name = "SGI HUBDEV Driver",
         .ids = "SGIHUB,SGITIO",
diff --git a/arch/ia64/sn/kernel/io_common.c b/arch/ia64/sn/kernel/io_common.c
index 12531de6754c..d4dd8f4b6b8d 100644
--- a/arch/ia64/sn/kernel/io_common.c
+++ b/arch/ia64/sn/kernel/io_common.c
@@ -286,9 +286,10 @@ void sn_pci_fixup_slot(struct pci_dev *dev)
         list_add_tail(&pcidev_info->pdi_list,
                       &(SN_PLATFORM_DATA(dev->bus)->pcidev_info));
 
-        if (!SN_ACPI_BASE_SUPPORT())
+        if (SN_ACPI_BASE_SUPPORT())
+                sn_acpi_slot_fixup(dev, pcidev_info);
+        else
                 sn_more_slot_fixup(dev, 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
diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 990224a44121..9ad843e0383b 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -210,6 +210,9 @@ sn_more_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
                         dev->resource[idx].parent = &ioport_resource;
                 else
                         dev->resource[idx].parent = &iomem_resource;
+                /* If ROM, mark as shadowed in PROM */
+                if (idx == PCI_ROM_RESOURCE)
+                        dev->resource[idx].flags |= IORESOURCE_ROM_BIOS_COPY;
         }
         /* Create a pci_window in the pci_controller struct for
          * each device resource.