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