| 1 | /* $NetBSD: nouveau_subdev_bios_extdev.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2012 Nouveau Community |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
| 23 | * |
| 24 | * Authors: Martin Peres |
| 25 | */ |
| 26 | |
| 27 | #include <sys/cdefs.h> |
| 28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_extdev.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $" ); |
| 29 | |
| 30 | #include <subdev/bios.h> |
| 31 | #include <subdev/bios/dcb.h> |
| 32 | #include <subdev/bios/extdev.h> |
| 33 | |
| 34 | static u16 |
| 35 | extdev_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt) |
| 36 | { |
| 37 | u8 dcb_ver, dcb_hdr, dcb_cnt, dcb_len; |
| 38 | u16 dcb, extdev = 0; |
| 39 | |
| 40 | dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len); |
| 41 | if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40)) |
| 42 | return 0x0000; |
| 43 | |
| 44 | extdev = nv_ro16(bios, dcb + 18); |
| 45 | if (!extdev) |
| 46 | return 0x0000; |
| 47 | |
| 48 | *ver = nv_ro08(bios, extdev + 0); |
| 49 | *hdr = nv_ro08(bios, extdev + 1); |
| 50 | *cnt = nv_ro08(bios, extdev + 2); |
| 51 | *len = nv_ro08(bios, extdev + 3); |
| 52 | |
| 53 | return extdev + *hdr; |
| 54 | } |
| 55 | |
| 56 | static u16 |
| 57 | nvbios_extdev_entry(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len) |
| 58 | { |
| 59 | u8 hdr, cnt; |
| 60 | u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt); |
| 61 | if (extdev && idx < cnt) |
| 62 | return extdev + idx * *len; |
| 63 | return 0x0000; |
| 64 | } |
| 65 | |
| 66 | static void |
| 67 | extdev_parse_entry(struct nouveau_bios *bios, u16 offset, |
| 68 | struct nvbios_extdev_func *entry) |
| 69 | { |
| 70 | entry->type = nv_ro08(bios, offset + 0); |
| 71 | entry->addr = nv_ro08(bios, offset + 1); |
| 72 | entry->bus = (nv_ro08(bios, offset + 2) >> 4) & 1; |
| 73 | } |
| 74 | |
| 75 | int |
| 76 | nvbios_extdev_parse(struct nouveau_bios *bios, int idx, |
| 77 | struct nvbios_extdev_func *func) |
| 78 | { |
| 79 | u8 ver, len; |
| 80 | u16 entry; |
| 81 | |
| 82 | if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len))) |
| 83 | return -EINVAL; |
| 84 | |
| 85 | extdev_parse_entry(bios, entry, func); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | int |
| 91 | nvbios_extdev_find(struct nouveau_bios *bios, enum nvbios_extdev_type type, |
| 92 | struct nvbios_extdev_func *func) |
| 93 | { |
| 94 | u8 ver, len, i; |
| 95 | u16 entry; |
| 96 | |
| 97 | i = 0; |
| 98 | while (!(entry = nvbios_extdev_entry(bios, i++, &ver, &len))) { |
| 99 | extdev_parse_entry(bios, entry, func); |
| 100 | if (func->type == type) |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | return -EINVAL; |
| 105 | } |
| 106 | |