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1da177e4 | 1 | /* |
03fbaca3 BH |
2 | * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P. |
3 | * Alex Williamson <alex.williamson@hp.com> | |
4 | * Bjorn Helgaas <bjorn.helgaas@hp.com> | |
1da177e4 | 5 | * |
03fbaca3 BH |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 | 14 | #include <linux/acpi.h> |
1da177e4 LT |
15 | |
16 | #include <asm/acpi-ext.h> | |
17 | ||
03fbaca3 BH |
18 | /* |
19 | * Device CSRs that do not appear in PCI config space should be described | |
20 | * via ACPI. This would normally be done with Address Space Descriptors | |
21 | * marked as "consumer-only," but old versions of Windows and Linux ignore | |
22 | * the producer/consumer flag, so HP invented a vendor-defined resource to | |
23 | * describe the location and size of CSR space. | |
24 | */ | |
1da177e4 | 25 | |
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26 | struct acpi_vendor_uuid hp_ccsr_uuid = { |
27 | .subtype = 2, | |
28 | .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a, | |
29 | 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad }, | |
1da177e4 LT |
30 | }; |
31 | ||
03fbaca3 | 32 | static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length) |
1da177e4 | 33 | { |
03fbaca3 BH |
34 | acpi_status status; |
35 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
36 | struct acpi_resource *resource; | |
37 | struct acpi_resource_vendor_typed *vendor; | |
1da177e4 | 38 | |
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39 | status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid, |
40 | &buffer); | |
1da177e4 | 41 | |
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42 | resource = buffer.pointer; |
43 | vendor = &resource->data.vendor_typed; | |
1da177e4 | 44 | |
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45 | if (ACPI_FAILURE(status) || vendor->byte_length < 16) { |
46 | status = AE_NOT_FOUND; | |
47 | goto exit; | |
48 | } | |
1da177e4 | 49 | |
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50 | memcpy(base, vendor->byte_data, sizeof(*base)); |
51 | memcpy(length, vendor->byte_data + 8, sizeof(*length)); | |
52 | ||
53 | exit: | |
02438d87 | 54 | kfree(buffer.pointer); |
03fbaca3 | 55 | return status; |
1da177e4 LT |
56 | } |
57 | ||
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58 | struct csr_space { |
59 | u64 base; | |
60 | u64 length; | |
1da177e4 LT |
61 | }; |
62 | ||
03fbaca3 | 63 | static acpi_status find_csr_space(struct acpi_resource *resource, void *data) |
1da177e4 | 64 | { |
03fbaca3 BH |
65 | struct csr_space *space = data; |
66 | struct acpi_resource_address64 addr; | |
1da177e4 | 67 | acpi_status status; |
1da177e4 | 68 | |
03fbaca3 BH |
69 | status = acpi_resource_to_address64(resource, &addr); |
70 | if (ACPI_SUCCESS(status) && | |
71 | addr.resource_type == ACPI_MEMORY_RANGE && | |
a45de93e | 72 | addr.address.address_length && |
03fbaca3 | 73 | addr.producer_consumer == ACPI_CONSUMER) { |
a45de93e LZ |
74 | space->base = addr.address.minimum; |
75 | space->length = addr.address.address_length; | |
03fbaca3 BH |
76 | return AE_CTRL_TERMINATE; |
77 | } | |
78 | return AE_OK; /* keep looking */ | |
79 | } | |
1da177e4 | 80 | |
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81 | static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length) |
82 | { | |
83 | struct csr_space space = { 0, 0 }; | |
1da177e4 | 84 | |
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85 | acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space); |
86 | if (!space.length) | |
87 | return AE_NOT_FOUND; | |
1da177e4 | 88 | |
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89 | *base = space.base; |
90 | *length = space.length; | |
1da177e4 LT |
91 | return AE_OK; |
92 | } | |
93 | ||
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94 | acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length) |
95 | { | |
96 | acpi_status status; | |
97 | ||
98 | status = hp_ccsr_locate(obj, csr_base, csr_length); | |
99 | if (ACPI_SUCCESS(status)) | |
100 | return status; | |
101 | ||
102 | return hp_crs_locate(obj, csr_base, csr_length); | |
103 | } | |
1da177e4 | 104 | EXPORT_SYMBOL(hp_acpi_csr_space); |