[IA64] update HP CSR space discovery via ACPI

Get rid of the manual search of _CRS, in favor of
acpi_get_vendor_resource() which is now provided by the ACPI CA.  And fall
back to searching for a consumer-only address space descriptor if no
vendor-defined resource is found.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 71 insertions, 72 deletions

diff --git a/arch/ia64/kernel/acpi-ext.c b/arch/ia64/kernel/acpi-ext.c
index 4a5574ff007b..fff82929d225 100644
--- a/arch/ia64/kernel/acpi-ext.c
+++ b/arch/ia64/kernel/acpi-ext.c
@@ -1,105 +1,104 @@
 /*
- * arch/ia64/kernel/acpi-ext.c
+ * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
+ *      Alex Williamson <alex.williamson@hp.com>
+ *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  *
- * Copyright (C) 2003 Hewlett-Packard
- * Copyright (C) Alex Williamson
- * Copyright (C) Bjorn Helgaas
- *
- * Vendor specific extensions to ACPI.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
  */
 
 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/acpi.h>
-#include <linux/efi.h>
 
 #include <asm/acpi-ext.h>
 
-struct acpi_vendor_descriptor {
-        u8 guid_id;
-        efi_guid_t guid;
-};
+/*
+ * Device CSRs that do not appear in PCI config space should be described
+ * via ACPI.  This would normally be done with Address Space Descriptors
+ * marked as "consumer-only," but old versions of Windows and Linux ignore
+ * the producer/consumer flag, so HP invented a vendor-defined resource to
+ * describe the location and size of CSR space.
+ */
 
-struct acpi_vendor_info {
-        struct acpi_vendor_descriptor *descriptor;
-        u8 *data;
-        u32 length;
+struct acpi_vendor_uuid hp_ccsr_uuid = {
+        .subtype = 2,
+        .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
+            0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
 };
 
-acpi_status
-acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
+static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length)
 {
-        struct acpi_vendor_info *info = (struct acpi_vendor_info *)context;
-        struct acpi_resource_vendor *vendor;
-        struct acpi_vendor_descriptor *descriptor;
-        u32 byte_length;
-
-        if (resource->type != ACPI_RESOURCE_TYPE_VENDOR)
-                return AE_OK;
-
-        vendor = (struct acpi_resource_vendor *)&resource->data;
-        descriptor = (struct acpi_vendor_descriptor *)vendor->byte_data;
-        if (vendor->byte_length <= sizeof(*info->descriptor) ||
-            descriptor->guid_id != info->descriptor->guid_id ||
-            efi_guidcmp(descriptor->guid, info->descriptor->guid))
-                return AE_OK;
-
-        byte_length = vendor->byte_length - sizeof(struct acpi_vendor_descriptor);
-        info->data = acpi_os_allocate(byte_length);
-        if (!info->data)
-                return AE_NO_MEMORY;
-
-        memcpy(info->data,
-               vendor->byte_data + sizeof(struct acpi_vendor_descriptor),
-               byte_length);
-        info->length = byte_length;
-        return AE_CTRL_TERMINATE;
-}
+        acpi_status status;
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+        struct acpi_resource *resource;
+        struct acpi_resource_vendor_typed *vendor;
 
-acpi_status
-acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor * id,
-                          u8 ** data, u32 * byte_length)
-{
-        struct acpi_vendor_info info;
+        status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,
+                &buffer);
 
-        info.descriptor = id;
-        info.data = NULL;
+        resource = buffer.pointer;
+        vendor = &resource->data.vendor_typed;
 
-        acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match,
-                            &info);
-        if (!info.data)
-                return AE_NOT_FOUND;
+        if (ACPI_FAILURE(status) || vendor->byte_length < 16) {
+                status = AE_NOT_FOUND;
+                goto exit;
+        }
 
-        *data = info.data;
-        *byte_length = info.length;
-        return AE_OK;
+        memcpy(base, vendor->byte_data, sizeof(*base));
+        memcpy(length, vendor->byte_data + 8, sizeof(*length));
+
+  exit:
+        acpi_os_free(buffer.pointer);
+        return status;
 }
 
-struct acpi_vendor_descriptor hp_ccsr_descriptor = {
-        .guid_id = 2,
-        .guid =
-            EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01,
-                     0x37, 0x0e, 0xad)
+struct csr_space {
+        u64     base;
+        u64     length;
 };
 
-acpi_status hp_acpi_csr_space(acpi_handle obj, u64 * csr_base, u64 * csr_length)
+static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
 {
+        struct csr_space *space = data;
+        struct acpi_resource_address64 addr;
         acpi_status status;
-        u8 *data;
-        u32 length;
 
-        status =
-            acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
+        status = acpi_resource_to_address64(resource, &addr);
+        if (ACPI_SUCCESS(status) &&
+            addr.resource_type == ACPI_MEMORY_RANGE &&
+            addr.address_length &&
+            addr.producer_consumer == ACPI_CONSUMER) {
+                space->base = addr.minimum;
+                space->length = addr.address_length;
+                return AE_CTRL_TERMINATE;
+        }
+        return AE_OK;           /* keep looking */
+}
 
-        if (ACPI_FAILURE(status) || length != 16)
-                return AE_NOT_FOUND;
+static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
+{
+        struct csr_space space = { 0, 0 };
 
-        memcpy(csr_base, data, sizeof(*csr_base));
-        memcpy(csr_length, data + 8, sizeof(*csr_length));
-        acpi_os_free(data);
+        acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
+        if (!space.length)
+                return AE_NOT_FOUND;
 
+        *base = space.base;
+        *length = space.length;
         return AE_OK;
 }
 
+acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
+{
+        acpi_status status;
+
+        status = hp_ccsr_locate(obj, csr_base, csr_length);
+        if (ACPI_SUCCESS(status))
+                return status;
+
+        return hp_crs_locate(obj, csr_base, csr_length);
+}
 EXPORT_SYMBOL(hp_acpi_csr_space);