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>

5 files changed, 46 insertions, 5 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.
diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index e1dcefc69bb4..d087e0817715 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -81,7 +81,8 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
                 start = (loff_t)0xC0000;
                 *size = 0x20000; /* cover C000:0 through E000:0 */
         } else {
-                if (res->flags & IORESOURCE_ROM_COPY) {
+                if (res->flags &
+                        (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY)) {
                         *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
                         return (void __iomem *)(unsigned long)
                                 pci_resource_start(pdev, PCI_ROM_RESOURCE);
@@ -165,7 +166,8 @@ void __iomem *pci_map_rom_copy(struct pci_dev *pdev, size_t *size)
         if (!rom)
                 return NULL;
 
-        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW))
+        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW |
+                          IORESOURCE_ROM_BIOS_COPY))
                 return rom;
 
         res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
@@ -191,7 +193,7 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
 {
         struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
 
-        if (res->flags & IORESOURCE_ROM_COPY)
+        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
                 return;
 
         iounmap(rom);
@@ -215,6 +217,7 @@ void pci_remove_rom(struct pci_dev *pdev)
                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
         if (!(res->flags & (IORESOURCE_ROM_ENABLE |
                             IORESOURCE_ROM_SHADOW |
+                            IORESOURCE_ROM_BIOS_COPY |
                             IORESOURCE_ROM_COPY)))
                 pci_disable_rom(pdev);
 }
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index d42c83399071..cf8696d4a138 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -89,6 +89,7 @@ struct resource_list {
 #define IORESOURCE_ROM_ENABLE           (1<<0)  /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
 #define IORESOURCE_ROM_SHADOW           (1<<1)  /* ROM is copy at C000:0 */
 #define IORESOURCE_ROM_COPY             (1<<2)  /* ROM is alloc'd copy, resource field overlaid */
+#define IORESOURCE_ROM_BIOS_COPY        (1<<3)  /* ROM is BIOS copy, resource field overlaid */
 
 /* PC/ISA/whatever - the normal PC address spaces: IO and memory */
 extern struct resource ioport_resource;