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/*
* arch/ia64/kernel/acpi-ext.c
*
* 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>
struct acpi_vendor_descriptor {
u8 guid_id;
efi_guid_t guid;
};
struct acpi_vendor_info {
struct acpi_vendor_descriptor *descriptor;
u8 *data;
u32 length;
};
acpi_status
acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
{
struct acpi_vendor_info *info = (struct acpi_vendor_info *) context;
struct acpi_resource_vendor *vendor;
struct acpi_vendor_descriptor *descriptor;
u32 length;
if (resource->id != ACPI_RSTYPE_VENDOR)
return AE_OK;
vendor = (struct acpi_resource_vendor *) &resource->data;
descriptor = (struct acpi_vendor_descriptor *) vendor->reserved;
if (vendor->length <= sizeof(*info->descriptor) ||
descriptor->guid_id != info->descriptor->guid_id ||
efi_guidcmp(descriptor->guid, info->descriptor->guid))
return AE_OK;
length = vendor->length - sizeof(struct acpi_vendor_descriptor);
info->data = acpi_os_allocate(length);
if (!info->data)
return AE_NO_MEMORY;
memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), length);
info->length = length;
return AE_CTRL_TERMINATE;
}
acpi_status
acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor *id,
u8 **data, u32 *length)
{
struct acpi_vendor_info info;
info.descriptor = id;
info.data = NULL;
acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match, &info);
if (!info.data)
return AE_NOT_FOUND;
*data = info.data;
*length = info.length;
return AE_OK;
}
struct acpi_vendor_descriptor hp_ccsr_descriptor = {
.guid_id = 2,
.guid = EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad)
};
acpi_status
hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
{
acpi_status status;
u8 *data;
u32 length;
status = acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
if (ACPI_FAILURE(status) || length != 16)
return AE_NOT_FOUND;
memcpy(csr_base, data, sizeof(*csr_base));
memcpy(csr_length, data + 8, sizeof(*csr_length));
acpi_os_free(data);
return AE_OK;
}
EXPORT_SYMBOL(hp_acpi_csr_space);
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