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101 lines
2.6 KiB
101 lines
2.6 KiB
// 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 <[email protected]> |
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* Bjorn Helgaas <[email protected]> |
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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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