/*
- * 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:
+ kfree(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);
git.openpandora.org / pandora-kernel.git / blobdiff