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 */ 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 device *); 28 #else 29 static inline bool 30 nouveau_acpi_rom_supported(struct device *dev) 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 47 acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 48 { 49 u32 limit = (offset + length + 0xfff) & ~0xfff; 50 u32 start = offset & ~0x00000fff; 51 u32 fetch = limit - start; 52 53 if (nvbios_extend(bios, limit) >= 0) { 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 68 acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 69 { 70 u32 limit = (offset + length + 0xfff) & ~0xfff; 71 u32 start = offset & ~0xfff; 72 u32 fetch = 0; 73 74 if (nvbios_extend(bios, limit) >= 0) { 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 * 89 acpi_init(struct nvkm_bios *bios, const char *name) 90 { 91 if (!nouveau_acpi_rom_supported(bios->subdev.device->dev)) 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 }; 111