LXR linux/drivers/gpu/drm/nouveau/core/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
  25#include <subdev/mxm.h>
  26#include "mxms.h"
  27
  28#define ROM16(x) le16_to_cpu(*(u16 *)&(x))
  29#define ROM32(x) le32_to_cpu(*(u32 *)&(x))
  30
  31static u8 *
  32mxms_data(struct nouveau_mxm *mxm)
  33{
  34        return mxm->mxms;
  35
  36}
  37
  38u16
  39mxms_version(struct nouveau_mxm *mxm)
  40{
  41        u8 *mxms = mxms_data(mxm);
  42        u16 version = (mxms[4] << 8) | mxms[5];
  43        switch (version ) {
  44        case 0x0200:
  45        case 0x0201:
  46        case 0x0300:
  47                return version;
  48        default:
  49                break;
  50        }
  51
  52        nv_debug(mxm, "unknown version %d.%d\n", mxms[4], mxms[5]);
  53        return 0x0000;
  54}
  55
  56u16
  57mxms_headerlen(struct nouveau_mxm *mxm)
  58{
  59        return 8;
  60}
  61
  62u16
  63mxms_structlen(struct nouveau_mxm *mxm)
  64{
  65        return *(u16 *)&mxms_data(mxm)[6];
  66}
  67
  68bool
  69mxms_checksum(struct nouveau_mxm *mxm)
  70{
  71        u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
  72        u8 *mxms = mxms_data(mxm), sum = 0;
  73        while (size--)
  74                sum += *mxms++;
  75        if (sum) {
  76                nv_debug(mxm, "checksum invalid\n");
  77                return false;
  78        }
  79        return true;
  80}
  81
  82bool
  83mxms_valid(struct nouveau_mxm *mxm)
  84{
  85        u8 *mxms = mxms_data(mxm);
  86        if (*(u32 *)mxms != 0x5f4d584d) {
  87                nv_debug(mxm, "signature invalid\n");
  88                return false;
  89        }
  90
  91        if (!mxms_version(mxm) || !mxms_checksum(mxm))
  92                return false;
  93
  94        return true;
  95}
  96
  97bool
  98mxms_foreach(struct nouveau_mxm *mxm, u8 types,
  99             bool (*exec)(struct nouveau_mxm *, u8 *, void *), void *info)
 100{
 101        u8 *mxms = mxms_data(mxm);
 102        u8 *desc = mxms + mxms_headerlen(mxm);
 103        u8 *fini = desc + mxms_structlen(mxm) - 1;
 104        while (desc < fini) {
 105                u8 type = desc[0] & 0x0f;
 106                u8 headerlen = 0;
 107                u8 recordlen = 0;
 108                u8 entries = 0;
 109
 110                switch (type) {
 111                case 0: /* Output Device Structure */
 112                        if (mxms_version(mxm) >= 0x0300)
 113                                headerlen = 8;
 114                        else
 115                                headerlen = 6;
 116                        break;
 117                case 1: /* System Cooling Capability Structure */
 118                case 2: /* Thermal Structure */
 119                case 3: /* Input Power Structure */
 120                        headerlen = 4;
 121                        break;
 122                case 4: /* GPIO Device Structure */
 123                        headerlen = 4;
 124                        recordlen = 2;
 125                        entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
 126                        break;
 127                case 5: /* Vendor Specific Structure */
 128                        headerlen = 8;
 129                        break;
 130                case 6: /* Backlight Control Structure */
 131                        if (mxms_version(mxm) >= 0x0300) {
 132                                headerlen = 4;
 133                                recordlen = 8;
 134                                entries   = (desc[1] & 0xf0) >> 4;
 135                        } else {
 136                                headerlen = 8;
 137                        }
 138                        break;
 139                case 7: /* Fan Control Structure */
 140                        headerlen = 8;
 141                        recordlen = 4;
 142                        entries   = desc[1] & 0x07;
 143                        break;
 144                default:
 145                        nv_debug(mxm, "unknown descriptor type %d\n", type);
 146                        return false;
 147                }
 148
 149                if (nv_subdev(mxm)->debug >= NV_DBG_DEBUG && (exec == NULL)) {
 150                        static const char * mxms_desc_name[] = {
 151                                "ODS", "SCCS", "TS", "IPS",
 152                                "GSD", "VSS", "BCS", "FCS",
 153                        };
 154                        u8 *dump = desc;
 155                        int i, j;
 156
 157                        nv_debug(mxm, "%4s: ", mxms_desc_name[type]);
 158                        for (j = headerlen - 1; j >= 0; j--)
 159                                pr_cont("%02x", dump[j]);
 160                        pr_cont("\n");
 161                        dump += headerlen;
 162
 163                        for (i = 0; i < entries; i++, dump += recordlen) {
 164                                nv_debug(mxm, "      ");
 165                                for (j = recordlen - 1; j >= 0; j--)
 166                                        pr_cont("%02x", dump[j]);
 167                                pr_cont("\n");
 168                        }
 169                }
 170
 171                if (types & (1 << type)) {
 172                        if (!exec(mxm, desc, info))
 173                                return false;
 174                }
 175
 176                desc += headerlen + (entries * recordlen);
 177        }
 178
 179        return true;
 180}
 181
 182void
 183mxms_output_device(struct nouveau_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
 184{
 185        u64 data = ROM32(pdata[0]);
 186        if (mxms_version(mxm) >= 0x0300)
 187                data |= (u64)ROM16(pdata[4]) << 32;
 188
 189        desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
 190        desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
 191        desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
 192        desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
 193}
 194