LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.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 "mxms.h"
  25
  26#define ROM16(x) get_unaligned_le16(&(x))
  27#define ROM32(x) get_unaligned_le32(&(x))
  28
  29static u8 *
  30mxms_data(struct nvkm_mxm *mxm)
  31{
  32        return mxm->mxms;
  33
  34}
  35
  36u16
  37mxms_version(struct nvkm_mxm *mxm)
  38{
  39        u8 *mxms = mxms_data(mxm);
  40        u16 version = (mxms[4] << 8) | mxms[5];
  41        switch (version ) {
  42        case 0x0200:
  43        case 0x0201:
  44        case 0x0300:
  45                return version;
  46        default:
  47                break;
  48        }
  49
  50        nvkm_debug(&mxm->subdev, "unknown version %d.%d\n", mxms[4], mxms[5]);
  51        return 0x0000;
  52}
  53
  54u16
  55mxms_headerlen(struct nvkm_mxm *mxm)
  56{
  57        return 8;
  58}
  59
  60u16
  61mxms_structlen(struct nvkm_mxm *mxm)
  62{
  63        return *(u16 *)&mxms_data(mxm)[6];
  64}
  65
  66bool
  67mxms_checksum(struct nvkm_mxm *mxm)
  68{
  69        u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
  70        u8 *mxms = mxms_data(mxm), sum = 0;
  71        while (size--)
  72                sum += *mxms++;
  73        if (sum) {
  74                nvkm_debug(&mxm->subdev, "checksum invalid\n");
  75                return false;
  76        }
  77        return true;
  78}
  79
  80bool
  81mxms_valid(struct nvkm_mxm *mxm)
  82{
  83        u8 *mxms = mxms_data(mxm);
  84        if (*(u32 *)mxms != 0x5f4d584d) {
  85                nvkm_debug(&mxm->subdev, "signature invalid\n");
  86                return false;
  87        }
  88
  89        if (!mxms_version(mxm) || !mxms_checksum(mxm))
  90                return false;
  91
  92        return true;
  93}
  94
  95bool
  96mxms_foreach(struct nvkm_mxm *mxm, u8 types,
  97             bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info)
  98{
  99        struct nvkm_subdev *subdev = &mxm->subdev;
 100        u8 *mxms = mxms_data(mxm);
 101        u8 *desc = mxms + mxms_headerlen(mxm);
 102        u8 *fini = desc + mxms_structlen(mxm) - 1;
 103        while (desc < fini) {
 104                u8 type = desc[0] & 0x0f;
 105                u8 headerlen = 0;
 106                u8 recordlen = 0;
 107                u8 entries = 0;
 108
 109                switch (type) {
 110                case 0: /* Output Device Structure */
 111                        if (mxms_version(mxm) >= 0x0300)
 112                                headerlen = 8;
 113                        else
 114                                headerlen = 6;
 115                        break;
 116                case 1: /* System Cooling Capability Structure */
 117                case 2: /* Thermal Structure */
 118                case 3: /* Input Power Structure */
 119                        headerlen = 4;
 120                        break;
 121                case 4: /* GPIO Device Structure */
 122                        headerlen = 4;
 123                        recordlen = 2;
 124                        entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
 125                        break;
 126                case 5: /* Vendor Specific Structure */
 127                        headerlen = 8;
 128                        break;
 129                case 6: /* Backlight Control Structure */
 130                        if (mxms_version(mxm) >= 0x0300) {
 131                                headerlen = 4;
 132                                recordlen = 8;
 133                                entries   = (desc[1] & 0xf0) >> 4;
 134                        } else {
 135                                headerlen = 8;
 136                        }
 137                        break;
 138                case 7: /* Fan Control Structure */
 139                        headerlen = 8;
 140                        recordlen = 4;
 141                        entries   = desc[1] & 0x07;
 142                        break;
 143                default:
 144                        nvkm_debug(subdev, "unknown descriptor type %d\n", type);
 145                        return false;
 146                }
 147
 148                if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
 149                        static const char * mxms_desc[] = {
 150                                "ODS", "SCCS", "TS", "IPS",
 151                                "GSD", "VSS", "BCS", "FCS",
 152                        };
 153                        u8 *dump = desc;
 154                        char data[32], *ptr;
 155                        int i, j;
 156
 157                        for (j = headerlen - 1, ptr = data; j >= 0; j--)
 158                                ptr += sprintf(ptr, "%02x", dump[j]);
 159                        dump += headerlen;
 160
 161                        nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data);
 162                        for (i = 0; i < entries; i++, dump += recordlen) {
 163                                for (j = recordlen - 1, ptr = data; j >= 0; j--)
 164                                        ptr += sprintf(ptr, "%02x", dump[j]);
 165                                nvkm_debug(subdev, "      %s\n", data);
 166                        }
 167                }
 168
 169                if (types & (1 << type)) {
 170                        if (!exec(mxm, desc, info))
 171                                return false;
 172                }
 173
 174                desc += headerlen + (entries * recordlen);
 175        }
 176
 177        return true;
 178}
 179
 180void
 181mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
 182{
 183        u64 data = ROM32(pdata[0]);
 184        if (mxms_version(mxm) >= 0x0300)
 185                data |= (u64)ROM16(pdata[4]) << 32;
 186
 187        desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
 188        desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
 189        desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
 190        desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
 191}
 192