// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
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* Alex Williamson <alex.williamson@hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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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.address_length &&
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addr.producer_consumer == ACPI_CONSUMER) {
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space->base = addr.address.minimum;
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space->length = addr.address.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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