1/* $NetBSD: nouveau_nvkm_subdev_bios_M0203.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */ 2 3/* 4 * Copyright 2014 Red Hat Inc. 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: Ben Skeggs 25 */ 26#include <sys/cdefs.h> 27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_M0203.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $"); 28 29#include <subdev/bios.h> 30#include <subdev/bios/bit.h> 31#include <subdev/bios/M0203.h> 32 33u32 34nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 35{ 36 struct bit_entry bit_M; 37 u32 data = 0x00000000; 38 39 if (!bit_entry(bios, 'M', &bit_M)) { 40 if (bit_M.version == 2 && bit_M.length > 0x04) 41 data = nvbios_rd16(bios, bit_M.offset + 0x03); 42 if (data) { 43 *ver = nvbios_rd08(bios, data + 0x00); 44 switch (*ver) { 45 case 0x10: 46 *hdr = nvbios_rd08(bios, data + 0x01); 47 *len = nvbios_rd08(bios, data + 0x02); 48 *cnt = nvbios_rd08(bios, data + 0x03); 49 return data; 50 default: 51 break; 52 } 53 } 54 } 55 56 return 0x00000000; 57} 58 59u32 60nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len, 61 struct nvbios_M0203T *info) 62{ 63 u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len); 64 memset(info, 0x00, sizeof(*info)); 65 switch (!!data * *ver) { 66 case 0x10: 67 info->type = nvbios_rd08(bios, data + 0x04); 68 info->pointer = nvbios_rd16(bios, data + 0x05); 69 break; 70 default: 71 break; 72 } 73 return data; 74} 75 76u32 77nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr) 78{ 79 u8 cnt, len; 80 u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len); 81 if (data && idx < cnt) { 82 data = data + *hdr + idx * len; 83 *hdr = len; 84 return data; 85 } 86 return 0x00000000; 87} 88 89u32 90nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr, 91 struct nvbios_M0203E *info) 92{ 93 u32 data = nvbios_M0203Ee(bios, idx, ver, hdr); 94 memset(info, 0x00, sizeof(*info)); 95 switch (!!data * *ver) { 96 case 0x10: 97 info->type = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0; 98 info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4; 99 info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0; 100 return data; 101 default: 102 break; 103 } 104 return 0x00000000; 105} 106 107u32 108nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr, 109 struct nvbios_M0203E *info) 110{ 111 struct nvkm_subdev *subdev = &bios->subdev; 112 struct nvbios_M0203T M0203T; 113 u8 cnt, len, idx = 0xff; 114 u32 data; 115 116 if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) { 117 nvkm_warn(subdev, "M0203T not found\n"); 118 return 0x00000000; 119 } 120 121 while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) { 122 switch (M0203T.type) { 123 case M0203T_TYPE_RAMCFG: 124 if (info->strap != ramcfg) 125 continue; 126 return data; 127 default: 128 nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type); 129 return 0x00000000; 130 } 131 } 132 133 return data; 134} 135