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 a9dc36901b1..99d7f278612 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 12531de6754..d4dd8f4b6b8 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 990224a4412..9ad843e0383 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.