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1 | /* |
2 | * Copyright 2012 Red Hat Inc. | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | * OTHER DEALINGS IN THE SOFTWARE. | |
21 | * | |
22 | */ | |
ad4a3626 BS |
23 | #include "priv.h" |
24 | ||
25 | #if defined(CONFIG_ACPI) && defined(CONFIG_X86) | |
26 | int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len); | |
27 | bool nouveau_acpi_rom_supported(struct pci_dev *pdev); | |
28 | #else | |
29 | static inline bool | |
30 | nouveau_acpi_rom_supported(struct pci_dev *pdev) | |
31 | { | |
32 | return false; | |
33 | } | |
34 | ||
35 | static inline int | |
36 | nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) | |
37 | { | |
38 | return -EINVAL; | |
39 | } | |
40 | #endif | |
41 | ||
42 | /* This version of the shadow function disobeys the ACPI spec and tries | |
43 | * to fetch in units of more than 4KiB at a time. This is a LOT faster | |
44 | * on some systems, such as Lenovo W530. | |
45 | */ | |
46 | static u32 | |
d390b480 | 47 | acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios) |
ad4a3626 BS |
48 | { |
49 | u32 limit = (offset + length + 0xfff) & ~0xfff; | |
50 | u32 start = offset & ~0x00000fff; | |
51 | u32 fetch = limit - start; | |
52 | ||
4195f406 | 53 | if (nvbios_extend(bios, limit) >= 0) { |
ad4a3626 BS |
54 | int ret = nouveau_acpi_get_bios_chunk(bios->data, start, fetch); |
55 | if (ret == fetch) | |
56 | return fetch; | |
57 | } | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | /* Other systems, such as the one in fdo#55948, will report a success | |
63 | * but only return 4KiB of data. The common bios fetching logic will | |
64 | * detect an invalid image, and fall back to this version of the read | |
65 | * function. | |
66 | */ | |
67 | static u32 | |
d390b480 | 68 | acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios) |
ad4a3626 BS |
69 | { |
70 | u32 limit = (offset + length + 0xfff) & ~0xfff; | |
71 | u32 start = offset & ~0xfff; | |
72 | u32 fetch = 0; | |
73 | ||
4195f406 | 74 | if (nvbios_extend(bios, limit) >= 0) { |
ad4a3626 BS |
75 | while (start + fetch < limit) { |
76 | int ret = nouveau_acpi_get_bios_chunk(bios->data, | |
77 | start + fetch, | |
78 | 0x1000); | |
79 | if (ret != 0x1000) | |
80 | break; | |
81 | fetch += 0x1000; | |
82 | } | |
83 | } | |
84 | ||
85 | return fetch; | |
86 | } | |
87 | ||
88 | static void * | |
d390b480 | 89 | acpi_init(struct nvkm_bios *bios, const char *name) |
ad4a3626 | 90 | { |
46484438 | 91 | if (!nouveau_acpi_rom_supported(bios->subdev.device->pdev)) |
ad4a3626 BS |
92 | return ERR_PTR(-ENODEV); |
93 | return NULL; | |
94 | } | |
95 | ||
96 | const struct nvbios_source | |
97 | nvbios_acpi_fast = { | |
98 | .name = "ACPI", | |
99 | .init = acpi_init, | |
100 | .read = acpi_read_fast, | |
101 | .rw = false, | |
102 | }; | |
103 | ||
104 | const struct nvbios_source | |
105 | nvbios_acpi_slow = { | |
106 | .name = "ACPI", | |
107 | .init = acpi_init, | |
108 | .read = acpi_read_slow, | |
109 | .rw = false, | |
110 | }; |