drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c

   1 /*
   2  * Copyright 2012 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
  23  */
  24 #include <subdev/bios.h>
  25 #include <subdev/bios/dcb.h>
  26 #include <subdev/bios/i2c.h>
  27
  28 u16
  29 dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30 {
  31         u16 i2c = 0x0000;
  32         u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
  33         if (dcb) {
  34                 if (*ver >= 0x15)
  35                         i2c = nv_ro16(bios, dcb + 2);
  36                 if (*ver >= 0x30)
  37                         i2c = nv_ro16(bios, dcb + 4);
  38         }
  39
  40         if (i2c && *ver >= 0x42) {
  41                 nv_warn(bios, "ccb %02x not supported\n", *ver);
  42                 return 0x0000;
  43         }
  44
  45         if (i2c && *ver >= 0x30) {
  46                 *ver = nv_ro08(bios, i2c + 0);
  47                 *hdr = nv_ro08(bios, i2c + 1);
  48                 *cnt = nv_ro08(bios, i2c + 2);
  49                 *len = nv_ro08(bios, i2c + 3);
  50         } else {
  51                 *ver = *ver; /* use DCB version */
  52                 *hdr = 0;
  53                 *cnt = 16;
  54                 *len = 4;
  55         }
  56
  57         return i2c;
  58 }
  59
  60 u16
  61 dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
  62 {
  63         u8  hdr, cnt;
  64         u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
  65         if (i2c && idx < cnt)
  66                 return i2c + hdr + (idx * *len);
  67         return 0x0000;
  68 }
  69
  70 int
  71 dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
  72 {
  73         u8  ver, len;
  74         u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
  75         if (ent) {
  76                 if (ver >= 0x41) {
  77                         if (!(nv_ro32(bios, ent) & 0x80000000))
  78                                 info->type = DCB_I2C_UNUSED;
  79                         else
  80                                 info->type = DCB_I2C_PMGR;
  81                 } else
  82                 if (ver >= 0x30) {
  83                         info->type = nv_ro08(bios, ent + 0x03);
  84                 } else {
  85                         info->type = nv_ro08(bios, ent + 0x03) & 0x07;
  86                         if (info->type == 0x07)
  87                                 info->type = DCB_I2C_UNUSED;
  88                 }
  89
  90                 info->drive = DCB_I2C_UNUSED;
  91                 info->sense = DCB_I2C_UNUSED;
  92                 info->share = DCB_I2C_UNUSED;
  93                 info->auxch = DCB_I2C_UNUSED;
  94
  95                 switch (info->type) {
  96                 case DCB_I2C_NV04_BIT:
  97                         info->drive = nv_ro08(bios, ent + 0);
  98                         info->sense = nv_ro08(bios, ent + 1);
  99                         return 0;
 100                 case DCB_I2C_NV4E_BIT:
 101                         info->drive = nv_ro08(bios, ent + 1);
 102                         return 0;
 103                 case DCB_I2C_NVIO_BIT:
 104                         info->drive = nv_ro08(bios, ent + 0) & 0x0f;
 105                         if (nv_ro08(bios, ent + 1) & 0x01)
 106                                 info->share = nv_ro08(bios, ent + 1) >> 1;
 107                         return 0;
 108                 case DCB_I2C_NVIO_AUX:
 109                         info->auxch = nv_ro08(bios, ent + 0) & 0x0f;
 110                         if (nv_ro08(bios, ent + 1) & 0x01)
 111                                         info->share = info->auxch;
 112                         return 0;
 113                 case DCB_I2C_PMGR:
 114                         info->drive = (nv_ro16(bios, ent + 0) & 0x01f) >> 0;
 115                         if (info->drive == 0x1f)
 116                                 info->drive = DCB_I2C_UNUSED;
 117                         info->auxch = (nv_ro16(bios, ent + 0) & 0x3e0) >> 5;
 118                         if (info->auxch == 0x1f)
 119                                 info->auxch = DCB_I2C_UNUSED;
 120                         info->share = info->auxch;
 121                         return 0;
 122                 case DCB_I2C_UNUSED:
 123                         return 0;
 124                 default:
 125                         nv_warn(bios, "unknown i2c type %d\n", info->type);
 126                         info->type = DCB_I2C_UNUSED;
 127                         return 0;
 128                 }
 129         }
 130
 131         if (bios->bmp_offset && idx < 2) {
 132                 /* BMP (from v4.0 has i2c info in the structure, it's in a
 133                  * fixed location on earlier VBIOS
 134                  */
 135                 if (nv_ro08(bios, bios->bmp_offset + 5) < 4)
 136                         ent = 0x0048;
 137                 else
 138                         ent = 0x0036 + bios->bmp_offset;
 139
 140                 if (idx == 0) {
 141                         info->drive = nv_ro08(bios, ent + 4);
 142                         if (!info->drive) info->drive = 0x3f;
 143                         info->sense = nv_ro08(bios, ent + 5);
 144                         if (!info->sense) info->sense = 0x3e;
 145                 } else
 146                 if (idx == 1) {
 147                         info->drive = nv_ro08(bios, ent + 6);
 148                         if (!info->drive) info->drive = 0x37;
 149                         info->sense = nv_ro08(bios, ent + 7);
 150                         if (!info->sense) info->sense = 0x36;
 151                 }
 152
 153                 info->type  = DCB_I2C_NV04_BIT;
 154                 info->share = DCB_I2C_UNUSED;
 155                 return 0;
 156         }
 157
 158         return -ENOENT;
 159 }