1 files changed, 231 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
new file mode 100644
index 00000000000..99d7f278612
--- /dev/null
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -0,0 +1,231 @@
+/*
+ * 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 <asm/sn/types.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/pcidev.h>
+#include <asm/sn/pcibus_provider_defs.h>
+#include <asm/sn/sn_sal.h>
+#include "xtalk/hubdev.h"
+#include <linux/acpi.h>
+
+
+/*
+ * The code in this file will only be executed when running with
+ * a PROM that has ACPI IO support. (i.e., SN_ACPI_BASE_SUPPORT() == 1)
+ */
+
+
+/*
+ * This value must match the UUID the PROM uses
+ * (io/acpi/defblk.c) when building a vendor descriptor.
+ */
+struct acpi_vendor_uuid sn_uuid = {
+	.subtype = 0,
+	.data	= { 0x2c, 0xc6, 0xa6, 0xfe, 0x9c, 0x44, 0xda, 0x11,
+		    0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
+};
+
+/*
+ * Perform the early IO init in PROM.
+ */
+static s64
+sal_ioif_init(u64 *result)
+{
+	struct ia64_sal_retval isrv = {0,0,0,0};
+
+	SAL_CALL_NOLOCK(isrv,
+			SN_SAL_IOIF_INIT, 0, 0, 0, 0, 0, 0, 0);
+	*result = isrv.v0;
+	return isrv.status;
+}
+
+/*
+ * sn_hubdev_add - The 'add' function of the acpi_sn_hubdev_driver.
+ *		   Called for every "SGIHUB" or "SGITIO" device defined
+ *		   in the ACPI namespace.
+ */
+static int __init
+sn_hubdev_add(struct acpi_device *device)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	u64 addr;
+	struct hubdev_info *hubdev;
+	struct hubdev_info *hubdev_ptr;
+	int i;
+	u64 nasid;
+	struct acpi_resource *resource;
+	int ret = 0;
+	acpi_status status;
+	struct acpi_resource_vendor_typed *vendor;
+	extern void sn_common_hubdev_init(struct hubdev_info *);
+
+	status = acpi_get_vendor_resource(device->handle, METHOD_NAME__CRS,
+					  &sn_uuid, &buffer);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_ERR
+		       "sn_hubdev_add: acpi_get_vendor_resource() failed: %d\n",
+		        status);
+		return 1;
+	}
+
+	resource = buffer.pointer;
+	vendor = &resource->data.vendor_typed;
+	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
+	    sizeof(struct hubdev_info *)) {
+		printk(KERN_ERR
+		       "sn_hubdev_add: Invalid vendor data length: %d\n",
+		        vendor->byte_length);
+		ret = 1;
+		goto exit;
+	}
+
+	memcpy(&addr, vendor->byte_data, sizeof(struct hubdev_info *));
+	hubdev_ptr = __va((struct hubdev_info *) addr);
+
+	nasid = hubdev_ptr->hdi_nasid;
+	i = nasid_to_cnodeid(nasid);
+	hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
+	*hubdev = *hubdev_ptr;
+	sn_common_hubdev_init(hubdev);
+
+exit:
+	kfree(buffer.pointer);
+	return ret;
+}
+
+/*
+ * sn_get_bussoft_ptr() - The pcibus_bussoft pointer is found in
+ *			  the ACPI Vendor resource for this bus.
+ */
+static struct pcibus_bussoft *
+sn_get_bussoft_ptr(struct pci_bus *bus)
+{
+	u64 addr;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_handle handle;
+	struct pcibus_bussoft *prom_bussoft_ptr;
+	struct acpi_resource *resource;
+	acpi_status status;
+	struct acpi_resource_vendor_typed *vendor;
+
+
+	handle = PCI_CONTROLLER(bus)->acpi_handle;
+	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
+					  &sn_uuid, &buffer);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_ERR "get_acpi_pcibus_ptr: "
+		       "get_acpi_bussoft_info() failed: %d\n",
+		       status);
+		return NULL;
+	}
+	resource = buffer.pointer;
+	vendor = &resource->data.vendor_typed;
+
+	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
+	     sizeof(struct pcibus_bussoft *)) {
+		printk(KERN_ERR
+		       "get_acpi_bussoft_ptr: Invalid vendor data "
+		       "length %d\n", vendor->byte_length);
+		kfree(buffer.pointer);
+		return NULL;
+	}
+	memcpy(&addr, vendor->byte_data, sizeof(struct pcibus_bussoft *));
+	prom_bussoft_ptr = __va((struct pcibus_bussoft *) addr);
+	kfree(buffer.pointer);
+
+	return prom_bussoft_ptr;
+}
+
+/*
+ * sn_acpi_bus_fixup
+ */
+void
+sn_acpi_bus_fixup(struct pci_bus *bus)
+{
+	struct pci_dev *pci_dev = NULL;
+	struct pcibus_bussoft *prom_bussoft_ptr;
+	extern void sn_common_bus_fixup(struct pci_bus *,
+					struct pcibus_bussoft *);
+
+	if (!bus->parent) {	/* If root bus */
+		prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
+		if (prom_bussoft_ptr == NULL) {
+			printk(KERN_ERR
+			       "sn_pci_fixup_bus: 0x%04x:0x%02x Unable to "
+			       "obtain prom_bussoft_ptr\n",
+			       pci_domain_nr(bus), bus->number);
+			return;
+		}
+		sn_common_bus_fixup(bus, prom_bussoft_ptr);
+	}
+	list_for_each_entry(pci_dev, &bus->devices, bus_list) {
+		sn_pci_fixup_slot(pci_dev);
+	}
+}
+
+/*
+ * 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",
+	.ops = {
+		.add = sn_hubdev_add,
+		},
+};
+
+
+/*
+ * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
+ *		     nodes and root buses in the DSDT. As a result, bus scanning
+ *		     will be initiated by the Linux ACPI code.
+ */
+
+void __init
+sn_io_acpi_init(void)
+{
+	u64 result;
+	s64 status;
+
+	acpi_bus_register_driver(&acpi_sn_hubdev_driver);
+	status = sal_ioif_init(&result);
+	if (status || result)
+		panic("sal_ioif_init failed: [%lx] %s\n",
+		      status, ia64_sal_strerror(status));
+}