/*
- * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
- * Alex Williamson <alex.williamson@hp.com>
- * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ * arch/ia64/kernel/acpi-ext.c
*
- * 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.
+ * Copyright (C) 2003 Hewlett-Packard
+ * Copyright (C) Alex Williamson
+ * Copyright (C) Bjorn Helgaas
+ *
+ * Vendor specific extensions to ACPI.
*/
+#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>
-/*
- * 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_descriptor {
+ u8 guid_id;
+ efi_guid_t guid;
+};
-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 },
+struct acpi_vendor_info {
+ struct acpi_vendor_descriptor *descriptor;
+ u8 *data;
+ u32 length;
};
-static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length)
+acpi_status
+acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
{
- acpi_status status;
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_resource *resource;
- struct acpi_resource_vendor_typed *vendor;
-
- status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,
- &buffer);
+ 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;
+}
- resource = buffer.pointer;
- vendor = &resource->data.vendor_typed;
+acpi_status
+acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor * id,
+ u8 ** data, u32 * byte_length)
+{
+ struct acpi_vendor_info info;
- if (ACPI_FAILURE(status) || vendor->byte_length < 16) {
- status = AE_NOT_FOUND;
- goto exit;
- }
+ info.descriptor = id;
+ info.data = NULL;
- memcpy(base, vendor->byte_data, sizeof(*base));
- memcpy(length, vendor->byte_data + 8, sizeof(*length));
+ acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match,
+ &info);
+ if (!info.data)
+ return AE_NOT_FOUND;
- exit:
- kfree(buffer.pointer);
- return status;
+ *data = info.data;
+ *byte_length = info.length;
+ return AE_OK;
}
-struct csr_space {
- u64 base;
- u64 length;
+struct acpi_vendor_descriptor hp_ccsr_descriptor = {
+ .guid_id = 2,
+ .guid =
+ EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01,
+ 0x37, 0x0e, 0xad)
};
-static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
+acpi_status hp_acpi_csr_space(acpi_handle obj, u64 * csr_base, u64 * csr_length)
{
- struct csr_space *space = data;
- struct acpi_resource_address64 addr;
acpi_status status;
+ u8 *data;
+ u32 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 */
-}
-
-static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
-{
- struct csr_space space = { 0, 0 };
+ status =
+ acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
- acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
- if (!space.length)
+ if (ACPI_FAILURE(status) || length != 16)
return AE_NOT_FOUND;
- *base = space.base;
- *length = space.length;
+ memcpy(csr_base, data, sizeof(*csr_base));
+ memcpy(csr_length, data + 8, sizeof(*csr_length));
+ acpi_os_free(data);
+
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);
git://git.onelab.eu / linux-2.6.git / blobdiff