| 1 | /* $NetBSD: nouveau_subdev_bios_i2c.c,v 1.1.1.1 2014/08/06 12:36:28 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 | |
| 27 | |
| 28 | #include <sys/cdefs.h> |
| 29 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_i2c.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $" ); |
| 30 | |
| 31 | #include "subdev/bios.h" |
| 32 | #include "subdev/bios/dcb.h" |
| 33 | #include "subdev/bios/i2c.h" |
| 34 | |
| 35 | u16 |
| 36 | dcb_i2c_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) |
| 37 | { |
| 38 | u16 i2c = 0x0000; |
| 39 | u16 dcb = dcb_table(bios, ver, hdr, cnt, len); |
| 40 | if (dcb) { |
| 41 | if (*ver >= 0x15) |
| 42 | i2c = nv_ro16(bios, dcb + 2); |
| 43 | if (*ver >= 0x30) |
| 44 | i2c = nv_ro16(bios, dcb + 4); |
| 45 | } |
| 46 | |
| 47 | if (i2c && *ver >= 0x30) { |
| 48 | *ver = nv_ro08(bios, i2c + 0); |
| 49 | *hdr = nv_ro08(bios, i2c + 1); |
| 50 | *cnt = nv_ro08(bios, i2c + 2); |
| 51 | *len = nv_ro08(bios, i2c + 3); |
| 52 | } else { |
| 53 | *ver = *ver; /* use DCB version */ |
| 54 | *hdr = 0; |
| 55 | *cnt = 16; |
| 56 | *len = 4; |
| 57 | } |
| 58 | |
| 59 | return i2c; |
| 60 | } |
| 61 | |
| 62 | u16 |
| 63 | dcb_i2c_entry(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len) |
| 64 | { |
| 65 | u8 hdr, cnt; |
| 66 | u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len); |
| 67 | if (i2c && idx < cnt) |
| 68 | return i2c + hdr + (idx * *len); |
| 69 | return 0x0000; |
| 70 | } |
| 71 | |
| 72 | int |
| 73 | dcb_i2c_parse(struct nouveau_bios *bios, u8 idx, struct dcb_i2c_entry *info) |
| 74 | { |
| 75 | u8 ver, len; |
| 76 | u16 ent = dcb_i2c_entry(bios, idx, &ver, &len); |
| 77 | if (ent) { |
| 78 | info->type = nv_ro08(bios, ent + 3); |
| 79 | info->share = DCB_I2C_UNUSED; |
| 80 | if (ver < 0x30) { |
| 81 | info->type &= 0x07; |
| 82 | if (info->type == 0x07) |
| 83 | info->type = DCB_I2C_UNUSED; |
| 84 | } |
| 85 | |
| 86 | switch (info->type) { |
| 87 | case DCB_I2C_NV04_BIT: |
| 88 | info->drive = nv_ro08(bios, ent + 0); |
| 89 | info->sense = nv_ro08(bios, ent + 1); |
| 90 | return 0; |
| 91 | case DCB_I2C_NV4E_BIT: |
| 92 | info->drive = nv_ro08(bios, ent + 1); |
| 93 | return 0; |
| 94 | case DCB_I2C_NVIO_BIT: |
| 95 | case DCB_I2C_NVIO_AUX: |
| 96 | info->drive = nv_ro08(bios, ent + 0) & 0x0f; |
| 97 | if (nv_ro08(bios, ent + 1) & 0x01) { |
| 98 | info->share = nv_ro08(bios, ent + 1) >> 1; |
| 99 | info->share &= 0x0f; |
| 100 | } |
| 101 | return 0; |
| 102 | case DCB_I2C_UNUSED: |
| 103 | return 0; |
| 104 | default: |
| 105 | nv_warn(bios, "unknown i2c type %d\n" , info->type); |
| 106 | info->type = DCB_I2C_UNUSED; |
| 107 | return 0; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | if (bios->bmp_offset && idx < 2) { |
| 112 | /* BMP (from v4.0 has i2c info in the structure, it's in a |
| 113 | * fixed location on earlier VBIOS |
| 114 | */ |
| 115 | if (nv_ro08(bios, bios->bmp_offset + 5) < 4) |
| 116 | ent = 0x0048; |
| 117 | else |
| 118 | ent = 0x0036 + bios->bmp_offset; |
| 119 | |
| 120 | if (idx == 0) { |
| 121 | info->drive = nv_ro08(bios, ent + 4); |
| 122 | if (!info->drive) info->drive = 0x3f; |
| 123 | info->sense = nv_ro08(bios, ent + 5); |
| 124 | if (!info->sense) info->sense = 0x3e; |
| 125 | } else |
| 126 | if (idx == 1) { |
| 127 | info->drive = nv_ro08(bios, ent + 6); |
| 128 | if (!info->drive) info->drive = 0x37; |
| 129 | info->sense = nv_ro08(bios, ent + 7); |
| 130 | if (!info->sense) info->sense = 0x36; |
| 131 | } |
| 132 | |
| 133 | info->type = DCB_I2C_NV04_BIT; |
| 134 | info->share = DCB_I2C_UNUSED; |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | return -ENOENT; |
| 139 | } |
| 140 | |