1 /* $NetBSD: nouveau_nvkm_subdev_bios_i2c.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */ 2 3 /* 4 * Copyright 2012 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_i2c.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $"); 28 29 #include <subdev/bios.h> 30 #include <subdev/bios/dcb.h> 31 #include <subdev/bios/i2c.h> 32 33 u16 34 dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 35 { 36 u16 i2c = 0x0000; 37 u16 dcb = dcb_table(bios, ver, hdr, cnt, len); 38 if (dcb) { 39 if (*ver >= 0x15) 40 i2c = nvbios_rd16(bios, dcb + 2); 41 if (*ver >= 0x30) 42 i2c = nvbios_rd16(bios, dcb + 4); 43 } 44 45 if (i2c && *ver >= 0x42) { 46 nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver); 47 return 0x0000; 48 } 49 50 if (i2c && *ver >= 0x30) { 51 *ver = nvbios_rd08(bios, i2c + 0); 52 *hdr = nvbios_rd08(bios, i2c + 1); 53 *cnt = nvbios_rd08(bios, i2c + 2); 54 *len = nvbios_rd08(bios, i2c + 3); 55 } else { 56 *ver = *ver; /* use DCB version */ 57 *hdr = 0; 58 *cnt = 16; 59 *len = 4; 60 } 61 62 return i2c; 63 } 64 65 u16 66 dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len) 67 { 68 u8 hdr, cnt; 69 u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len); 70 if (i2c && idx < cnt) 71 return i2c + hdr + (idx * *len); 72 return 0x0000; 73 } 74 75 int 76 dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info) 77 { 78 struct nvkm_subdev *subdev = &bios->subdev; 79 u8 ver, len; 80 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len); 81 if (ent) { 82 if (ver >= 0x41) { 83 u32 ent_value = nvbios_rd32(bios, ent); 84 u8 i2c_port = (ent_value >> 0) & 0x1f; 85 u8 dpaux_port = (ent_value >> 5) & 0x1f; 86 /* value 0x1f means unused according to DCB 4.x spec */ 87 if (i2c_port == 0x1f && dpaux_port == 0x1f) 88 info->type = DCB_I2C_UNUSED; 89 else 90 info->type = DCB_I2C_PMGR; 91 } else 92 if (ver >= 0x30) { 93 info->type = nvbios_rd08(bios, ent + 0x03); 94 } else { 95 info->type = nvbios_rd08(bios, ent + 0x03) & 0x07; 96 if (info->type == 0x07) 97 info->type = DCB_I2C_UNUSED; 98 } 99 100 info->drive = DCB_I2C_UNUSED; 101 info->sense = DCB_I2C_UNUSED; 102 info->share = DCB_I2C_UNUSED; 103 info->auxch = DCB_I2C_UNUSED; 104 105 switch (info->type) { 106 case DCB_I2C_NV04_BIT: 107 info->drive = nvbios_rd08(bios, ent + 0); 108 info->sense = nvbios_rd08(bios, ent + 1); 109 return 0; 110 case DCB_I2C_NV4E_BIT: 111 info->drive = nvbios_rd08(bios, ent + 1); 112 return 0; 113 case DCB_I2C_NVIO_BIT: 114 info->drive = nvbios_rd08(bios, ent + 0) & 0x0f; 115 if (nvbios_rd08(bios, ent + 1) & 0x01) 116 info->share = nvbios_rd08(bios, ent + 1) >> 1; 117 return 0; 118 case DCB_I2C_NVIO_AUX: 119 info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f; 120 if (nvbios_rd08(bios, ent + 1) & 0x01) 121 info->share = info->auxch; 122 return 0; 123 case DCB_I2C_PMGR: 124 info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0; 125 if (info->drive == 0x1f) 126 info->drive = DCB_I2C_UNUSED; 127 info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5; 128 if (info->auxch == 0x1f) 129 info->auxch = DCB_I2C_UNUSED; 130 info->share = info->auxch; 131 return 0; 132 case DCB_I2C_UNUSED: 133 return 0; 134 default: 135 nvkm_warn(subdev, "unknown i2c type %d\n", info->type); 136 info->type = DCB_I2C_UNUSED; 137 return 0; 138 } 139 } 140 141 if (bios->bmp_offset && idx < 2) { 142 /* BMP (from v4.0 has i2c info in the structure, it's in a 143 * fixed location on earlier VBIOS 144 */ 145 if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4) 146 ent = 0x0048; 147 else 148 ent = 0x0036 + bios->bmp_offset; 149 150 if (idx == 0) { 151 info->drive = nvbios_rd08(bios, ent + 4); 152 if (!info->drive) info->drive = 0x3f; 153 info->sense = nvbios_rd08(bios, ent + 5); 154 if (!info->sense) info->sense = 0x3e; 155 } else 156 if (idx == 1) { 157 info->drive = nvbios_rd08(bios, ent + 6); 158 if (!info->drive) info->drive = 0x37; 159 info->sense = nvbios_rd08(bios, ent + 7); 160 if (!info->sense) info->sense = 0x36; 161 } 162 163 info->type = DCB_I2C_NV04_BIT; 164 info->share = DCB_I2C_UNUSED; 165 return 0; 166 } 167 168 return -ENOENT; 169 } 170
Indexes created Tue Sep 23 14:10:03 GMT 2025