[IA64] update HP CSR space discovery via ACPI

/*

 * 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;

	acpi_status status;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	struct acpi_resource *resource;

	struct acpi_resource_vendor_typed *vendor;

	if (resource->type != ACPI_RESOURCE_TYPE_VENDOR)

		return AE_OK;

	status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,

		&buffer);

	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;

	resource = buffer.pointer;

	vendor = &resource->data.vendor_typed;

	byte_length = vendor->byte_length - sizeof(struct acpi_vendor_descriptor);

	info->data = acpi_os_allocate(byte_length);

	if (!info->data)

		return AE_NO_MEMORY;

	if (ACPI_FAILURE(status) || vendor->byte_length < 16) {

		status = AE_NOT_FOUND;

		goto exit;

	}

	memcpy(info->data,

	       vendor->byte_data + sizeof(struct acpi_vendor_descriptor),

	       byte_length);

	info->length = byte_length;

	return AE_CTRL_TERMINATE;

	memcpy(base, vendor->byte_data, sizeof(*base));

	memcpy(length, vendor->byte_data + 8, sizeof(*length));

  exit:

	acpi_os_free(buffer.pointer);

	return status;

}

acpi_status

acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor * id,

			  u8 ** data, u32 * byte_length)

struct csr_space {

	u64	base;

	u64	length;

};

static acpi_status find_csr_space(struct acpi_resource *resource, void *data)

{

	struct acpi_vendor_info info;

	struct csr_space *space = data;

	struct acpi_resource_address64 addr;

	acpi_status status;

	info.descriptor = id;

	info.data = NULL;

	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 */

}

	acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match,

			    &info);

	if (!info.data)

static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)

{

	struct csr_space space = { 0, 0 };

	acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);

	if (!space.length)

		return AE_NOT_FOUND;

	*data = info.data;

	*byte_length = info.length;

	*base = space.base;

	*length = space.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);

	status = hp_ccsr_locate(obj, csr_base, csr_length);

	if (ACPI_SUCCESS(status))

		return status;

	return AE_OK;

	return hp_crs_locate(obj, csr_base, csr_length);

}

EXPORT_SYMBOL(hp_acpi_csr_space);

/*

 * ia64/platform/hp/common/hp_acpi.h

 * (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

 * 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.

 *

 * Vendor specific extensions to ACPI.

 */

#ifndef _ASM_IA64_ACPI_EXT_H

#define _ASM_IA64_ACPI_EXT_H