dcb.c revision 565f571c48f01a681243a356e9083f5cf24b432e
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 * Authors: Ben Skeggs 23 */ 24 25#include "core/device.h" 26 27#include "subdev/bios.h" 28#include "subdev/bios/dcb.h" 29 30u16 31dcb_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 32{ 33 struct nouveau_device *device = nv_device(bios); 34 u16 dcb = 0x0000; 35 36 if (device->card_type > NV_04) 37 dcb = nv_ro16(bios, 0x36); 38 if (!dcb) { 39 nv_warn(bios, "DCB table not found\n"); 40 return dcb; 41 } 42 43 *ver = nv_ro08(bios, dcb); 44 45 if (*ver >= 0x41) { 46 nv_warn(bios, "DCB version 0x%02x unknown\n", *ver); 47 return 0x0000; 48 } else 49 if (*ver >= 0x30) { 50 if (nv_ro32(bios, dcb + 6) == 0x4edcbdcb) { 51 *hdr = nv_ro08(bios, dcb + 1); 52 *cnt = nv_ro08(bios, dcb + 2); 53 *len = nv_ro08(bios, dcb + 3); 54 return dcb; 55 } 56 } else 57 if (*ver >= 0x20) { 58 if (nv_ro32(bios, dcb + 4) == 0x4edcbdcb) { 59 u16 i2c = nv_ro16(bios, dcb + 2); 60 *hdr = 8; 61 *cnt = (i2c - dcb) / 8; 62 *len = 8; 63 return dcb; 64 } 65 } else 66 if (*ver >= 0x15) { 67 if (!nv_strncmp(bios, dcb - 7, 7, "DEV_REC")) { 68 u16 i2c = nv_ro16(bios, dcb + 2); 69 *hdr = 4; 70 *cnt = (i2c - dcb) / 10; 71 *len = 10; 72 return dcb; 73 } 74 } else { 75 /* 76 * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but 77 * always has the same single (crt) entry, even when tv-out 78 * present, so the conclusion is this version cannot really 79 * be used. 80 * 81 * v1.2 tables (some NV6/10, and NV15+) normally have the 82 * same 5 entries, which are not specific to the card and so 83 * no use. 84 * 85 * v1.2 does have an I2C table that read_dcb_i2c_table can 86 * handle, but cards exist (nv11 in #14821) with a bad i2c 87 * table pointer, so use the indices parsed in 88 * parse_bmp_structure. 89 * 90 * v1.1 (NV5+, maybe some NV4) is entirely unhelpful 91 */ 92 nv_warn(bios, "DCB contains no useful data\n"); 93 return 0x0000; 94 } 95 96 nv_warn(bios, "DCB header validation failed\n"); 97 return 0x0000; 98} 99 100u16 101dcb_outp(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len) 102{ 103 u8 hdr, cnt; 104 u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len); 105 if (dcb && idx < cnt) 106 return dcb + hdr + (idx * *len); 107 return 0x0000; 108} 109 110int 111dcb_outp_foreach(struct nouveau_bios *bios, void *data, 112 int (*exec)(struct nouveau_bios *, void *, int, u16)) 113{ 114 int ret, idx = -1; 115 u8 ver, len; 116 u16 outp; 117 118 while ((outp = dcb_outp(bios, ++idx, &ver, &len))) { 119 if (nv_ro32(bios, outp) == 0x00000000) 120 break; /* seen on an NV11 with DCB v1.5 */ 121 if (nv_ro32(bios, outp) == 0xffffffff) 122 break; /* seen on an NV17 with DCB v2.0 */ 123 124 if (nv_ro08(bios, outp) == DCB_OUTPUT_UNUSED) 125 continue; 126 if (nv_ro08(bios, outp) == DCB_OUTPUT_EOL) 127 break; 128 129 ret = exec(bios, data, idx, outp); 130 if (ret) 131 return ret; 132 } 133 134 return 0; 135} 136