subdev/bios/i2c.c

0001 /*
0002  * Copyright 2012 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs
0023  */
0024 #include <subdev/bios.h>
0025 #include <subdev/bios/dcb.h>
0026 #include <subdev/bios/i2c.h>
0027
0028 u16
0029 dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
0030 {
0031     u16 i2c = 0x0000;
0032     u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
0033     if (dcb) {
0034         if (*ver >= 0x15)
0035             i2c = nvbios_rd16(bios, dcb + 2);
0036         if (*ver >= 0x30)
0037             i2c = nvbios_rd16(bios, dcb + 4);
0038     }
0039
0040     if (i2c && *ver >= 0x42) {
0041         nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver);
0042         return 0x0000;
0043     }
0044
0045     if (i2c && *ver >= 0x30) {
0046         *ver = nvbios_rd08(bios, i2c + 0);
0047         *hdr = nvbios_rd08(bios, i2c + 1);
0048         *cnt = nvbios_rd08(bios, i2c + 2);
0049         *len = nvbios_rd08(bios, i2c + 3);
0050     } else {
0051         *ver = *ver; /* use DCB version */
0052         *hdr = 0;
0053         *cnt = 16;
0054         *len = 4;
0055     }
0056
0057     return i2c;
0058 }
0059
0060 u16
0061 dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
0062 {
0063     u8  hdr, cnt;
0064     u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
0065     if (i2c && idx < cnt)
0066         return i2c + hdr + (idx * *len);
0067     return 0x0000;
0068 }
0069
0070 int
0071 dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
0072 {
0073     struct nvkm_subdev *subdev = &bios->subdev;
0074     u8  ver, len;
0075     u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
0076     if (ent) {
0077         if (ver >= 0x41) {
0078             u32 ent_value = nvbios_rd32(bios, ent);
0079             u8 i2c_port = (ent_value >> 0) & 0x1f;
0080             u8 dpaux_port = (ent_value >> 5) & 0x1f;
0081             /* value 0x1f means unused according to DCB 4.x spec */
0082             if (i2c_port == 0x1f && dpaux_port == 0x1f)
0083                 info->type = DCB_I2C_UNUSED;
0084             else
0085                 info->type = DCB_I2C_PMGR;
0086         } else
0087         if (ver >= 0x30) {
0088             info->type = nvbios_rd08(bios, ent + 0x03);
0089         } else {
0090             info->type = nvbios_rd08(bios, ent + 0x03) & 0x07;
0091             if (info->type == 0x07)
0092                 info->type = DCB_I2C_UNUSED;
0093         }
0094
0095         info->drive = DCB_I2C_UNUSED;
0096         info->sense = DCB_I2C_UNUSED;
0097         info->share = DCB_I2C_UNUSED;
0098         info->auxch = DCB_I2C_UNUSED;
0099
0100         switch (info->type) {
0101         case DCB_I2C_NV04_BIT:
0102             info->drive = nvbios_rd08(bios, ent + 0);
0103             info->sense = nvbios_rd08(bios, ent + 1);
0104             return 0;
0105         case DCB_I2C_NV4E_BIT:
0106             info->drive = nvbios_rd08(bios, ent + 1);
0107             return 0;
0108         case DCB_I2C_NVIO_BIT:
0109             info->drive = nvbios_rd08(bios, ent + 0) & 0x0f;
0110             if (nvbios_rd08(bios, ent + 1) & 0x01)
0111                 info->share = nvbios_rd08(bios, ent + 1) >> 1;
0112             return 0;
0113         case DCB_I2C_NVIO_AUX:
0114             info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f;
0115             if (nvbios_rd08(bios, ent + 1) & 0x01)
0116                     info->share = info->auxch;
0117             return 0;
0118         case DCB_I2C_PMGR:
0119             info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0;
0120             if (info->drive == 0x1f)
0121                 info->drive = DCB_I2C_UNUSED;
0122             info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5;
0123             if (info->auxch == 0x1f)
0124                 info->auxch = DCB_I2C_UNUSED;
0125             info->share = info->auxch;
0126             return 0;
0127         case DCB_I2C_UNUSED:
0128             return 0;
0129         default:
0130             nvkm_warn(subdev, "unknown i2c type %d\n", info->type);
0131             info->type = DCB_I2C_UNUSED;
0132             return 0;
0133         }
0134     }
0135
0136     if (bios->bmp_offset && idx < 2) {
0137         /* BMP (from v4.0 has i2c info in the structure, it's in a
0138          * fixed location on earlier VBIOS
0139          */
0140         if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4)
0141             ent = 0x0048;
0142         else
0143             ent = 0x0036 + bios->bmp_offset;
0144
0145         if (idx == 0) {
0146             info->drive = nvbios_rd08(bios, ent + 4);
0147             if (!info->drive) info->drive = 0x3f;
0148             info->sense = nvbios_rd08(bios, ent + 5);
0149             if (!info->sense) info->sense = 0x3e;
0150         } else
0151         if (idx == 1) {
0152             info->drive = nvbios_rd08(bios, ent + 6);
0153             if (!info->drive) info->drive = 0x37;
0154             info->sense = nvbios_rd08(bios, ent + 7);
0155             if (!info->sense) info->sense = 0x36;
0156         }
0157
0158         info->type  = DCB_I2C_NV04_BIT;
0159         info->share = DCB_I2C_UNUSED;
0160         return 0;
0161     }
0162
0163     return -ENOENT;
0164 }