1 /* 2 * Copyright 2013 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 <bskeggs@redhat.com> 23 */ 24 #include <subdev/bios.h> 25 #include <subdev/bios/bit.h> 26 #include <subdev/bios/ramcfg.h> 27 #include <subdev/bios/M0203.h> 28 29 static u8 30 nvbios_ramcfg_strap(struct nvkm_subdev *subdev) 31 { 32 return (nvkm_rd32(subdev->device, 0x101000) & 0x0000003c) >> 2; 33 } 34 35 u8 36 nvbios_ramcfg_count(struct nvkm_bios *bios) 37 { 38 struct bit_entry bit_M; 39 40 if (!bit_entry(bios, 'M', &bit_M)) { 41 if (bit_M.version == 1 && bit_M.length >= 5) 42 return nvbios_rd08(bios, bit_M.offset + 2); 43 if (bit_M.version == 2 && bit_M.length >= 3) 44 return nvbios_rd08(bios, bit_M.offset + 0); 45 } 46 47 return 0x00; 48 } 49 50 u8 51 nvbios_ramcfg_index(struct nvkm_subdev *subdev) 52 { 53 struct nvkm_bios *bios = subdev->device->bios; 54 u8 strap = nvbios_ramcfg_strap(subdev); 55 u32 xlat = 0x00000000; 56 struct bit_entry bit_M; 57 struct nvbios_M0203E M0203E; 58 u8 ver, hdr; 59 60 if (!bit_entry(bios, 'M', &bit_M)) { 61 if (bit_M.version == 1 && bit_M.length >= 5) 62 xlat = nvbios_rd16(bios, bit_M.offset + 3); 63 if (bit_M.version == 2 && bit_M.length >= 3) { 64 /*XXX: is M ever shorter than this? 65 * if not - what is xlat used for now? 66 * also - sigh.. 67 */ 68 if (bit_M.length >= 7 && 69 nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E)) 70 return M0203E.group; 71 xlat = nvbios_rd16(bios, bit_M.offset + 1); 72 } 73 } 74 75 if (xlat) 76 strap = nvbios_rd08(bios, xlat + strap); 77 return strap; 78 } 79