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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/ia64/kernel/acpi-ext.c
10817 views
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/*

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 * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.

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 *	Alex Williamson <[email protected]>

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 *	Bjorn Helgaas <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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 */

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#include <linux/module.h>

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#include <linux/types.h>

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#include <linux/slab.h>

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#include <linux/acpi.h>

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#include <asm/acpi-ext.h>

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/*

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 * Device CSRs that do not appear in PCI config space should be described

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 * via ACPI.  This would normally be done with Address Space Descriptors

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 * marked as "consumer-only," but old versions of Windows and Linux ignore

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 * the producer/consumer flag, so HP invented a vendor-defined resource to

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 * describe the location and size of CSR space.

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 */

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struct acpi_vendor_uuid hp_ccsr_uuid = {

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	.subtype = 2,

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	.data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,

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	    0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },

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};

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

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{

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	acpi_status status;

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	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

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	struct acpi_resource *resource;

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	struct acpi_resource_vendor_typed *vendor;

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	status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,

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		&buffer);

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	resource = buffer.pointer;

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	vendor = &resource->data.vendor_typed;

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

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		status = AE_NOT_FOUND;

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		goto exit;

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	}

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

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

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  exit:

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	kfree(buffer.pointer);

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	return status;

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}

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struct csr_space {

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	u64	base;

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	u64	length;

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};

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

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{

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	struct csr_space *space = data;

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	struct acpi_resource_address64 addr;

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	acpi_status status;

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	status = acpi_resource_to_address64(resource, &addr);

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	if (ACPI_SUCCESS(status) &&

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	    addr.resource_type == ACPI_MEMORY_RANGE &&

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	    addr.address_length &&

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	    addr.producer_consumer == ACPI_CONSUMER) {

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		space->base = addr.minimum;

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		space->length = addr.address_length;

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		return AE_CTRL_TERMINATE;

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	}

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	return AE_OK;		/* keep looking */

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}

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

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{

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	struct csr_space space = { 0, 0 };

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

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	if (!space.length)

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		return AE_NOT_FOUND;

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	*base = space.base;

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	*length = space.length;

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	return AE_OK;

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}

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acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)

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{

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	acpi_status status;

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	status = hp_ccsr_locate(obj, csr_base, csr_length);

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	if (ACPI_SUCCESS(status))

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		return status;

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	return hp_crs_locate(obj, csr_base, csr_length);

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}

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EXPORT_SYMBOL(hp_acpi_csr_space);

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