drivers/gpu/drm/nouveau/core/subdev/mxm/base.c

   1 /*
   2  * Copyright 2011 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 <core/option.h>
  26
  27 #include <subdev/i2c.h>
  28 #include <subdev/mxm.h>
  29 #include <subdev/bios.h>
  30 #include <subdev/bios/mxm.h>
  31
  32 #include "mxms.h"
  33
  34 static bool
  35 mxm_shadow_rom_fetch(struct nouveau_i2c_port *i2c, u8 addr,
  36                      u8 offset, u8 size, u8 *data)
  37 {
  38         struct i2c_msg msgs[] = {
  39                 { .addr = addr, .flags = 0, .len = 1, .buf = &offset },
  40                 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
  41         };
  42
  43         return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
  44 }
  45
  46 static bool
  47 mxm_shadow_rom(struct nouveau_mxm *mxm, u8 version)
  48 {
  49         struct nouveau_bios *bios = nouveau_bios(mxm);
  50         struct nouveau_i2c *i2c = nouveau_i2c(mxm);
  51         struct nouveau_i2c_port *port = NULL;
  52         u8 i2cidx, mxms[6], addr, size;
  53
  54         i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
  55         if (i2cidx < 0x0f)
  56                 port = i2c->find(i2c, i2cidx);
  57         if (!port)
  58                 return false;
  59
  60         addr = 0x54;
  61         if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) {
  62                 addr = 0x56;
  63                 if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms))
  64                         return false;
  65         }
  66
  67         mxm->mxms = mxms;
  68         size = mxms_headerlen(mxm) + mxms_structlen(mxm);
  69         mxm->mxms = kmalloc(size, GFP_KERNEL);
  70
  71         if (mxm->mxms &&
  72             mxm_shadow_rom_fetch(port, addr, 0, size, mxm->mxms))
  73                 return true;
  74
  75         kfree(mxm->mxms);
  76         mxm->mxms = NULL;
  77         return false;
  78 }
  79
  80 #if defined(CONFIG_ACPI)
  81 static bool
  82 mxm_shadow_dsm(struct nouveau_mxm *mxm, u8 version)
  83 {
  84         struct nouveau_device *device = nv_device(mxm);
  85         static char muid[] = {
  86                 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
  87                 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
  88         };
  89         u32 mxms_args[] = { 0x00000000 };
  90         union acpi_object args[4] = {
  91                 /* _DSM MUID */
  92                 { .buffer.type = 3,
  93                   .buffer.length = sizeof(muid),
  94                   .buffer.pointer = muid,
  95                 },
  96                 /* spec says this can be zero to mean "highest revision", but
  97                  * of course there's at least one bios out there which fails
  98                  * unless you pass in exactly the version it supports..
  99                  */
 100                 { .integer.type = ACPI_TYPE_INTEGER,
 101                   .integer.value = (version & 0xf0) << 4 | (version & 0x0f),
 102                 },
 103                 /* MXMS function */
 104                 { .integer.type = ACPI_TYPE_INTEGER,
 105                   .integer.value = 0x00000010,
 106                 },
 107                 /* Pointer to MXMS arguments */
 108                 { .buffer.type = ACPI_TYPE_BUFFER,
 109                   .buffer.length = sizeof(mxms_args),
 110                   .buffer.pointer = (char *)mxms_args,
 111                 },
 112         };
 113         struct acpi_object_list list = { ARRAY_SIZE(args), args };
 114         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 115         union acpi_object *obj;
 116         acpi_handle handle;
 117         int ret;
 118
 119         handle = DEVICE_ACPI_HANDLE(&device->pdev->dev);
 120         if (!handle)
 121                 return false;
 122
 123         ret = acpi_evaluate_object(handle, "_DSM", &list, &retn);
 124         if (ret) {
 125                 nv_debug(mxm, "DSM MXMS failed: %d\n", ret);
 126                 return false;
 127         }
 128
 129         obj = retn.pointer;
 130         if (obj->type == ACPI_TYPE_BUFFER) {
 131                 mxm->mxms = kmemdup(obj->buffer.pointer,
 132                                          obj->buffer.length, GFP_KERNEL);
 133         } else
 134         if (obj->type == ACPI_TYPE_INTEGER) {
 135                 nv_debug(mxm, "DSM MXMS returned 0x%llx\n", obj->integer.value);
 136         }
 137
 138         kfree(obj);
 139         return mxm->mxms != NULL;
 140 }
 141 #endif
 142
 143 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 144
 145 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
 146
 147 static u8
 148 wmi_wmmx_mxmi(struct nouveau_mxm *mxm, u8 version)
 149 {
 150         u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
 151         struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
 152         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 153         union acpi_object *obj;
 154         acpi_status status;
 155
 156         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 157         if (ACPI_FAILURE(status)) {
 158                 nv_debug(mxm, "WMMX MXMI returned %d\n", status);
 159                 return 0x00;
 160         }
 161
 162         obj = retn.pointer;
 163         if (obj->type == ACPI_TYPE_INTEGER) {
 164                 version = obj->integer.value;
 165                 nv_debug(mxm, "WMMX MXMI version %d.%d\n",
 166                              (version >> 4), version & 0x0f);
 167         } else {
 168                 version = 0;
 169                 nv_debug(mxm, "WMMX MXMI returned non-integer\n");
 170         }
 171
 172         kfree(obj);
 173         return version;
 174 }
 175
 176 static bool
 177 mxm_shadow_wmi(struct nouveau_mxm *mxm, u8 version)
 178 {
 179         u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
 180         struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
 181         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 182         union acpi_object *obj;
 183         acpi_status status;
 184
 185         if (!wmi_has_guid(WMI_WMMX_GUID)) {
 186                 nv_debug(mxm, "WMMX GUID not found\n");
 187                 return false;
 188         }
 189
 190         mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
 191         if (!mxms_args[1])
 192                 mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
 193         if (!mxms_args[1])
 194                 return false;
 195
 196         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 197         if (ACPI_FAILURE(status)) {
 198                 nv_debug(mxm, "WMMX MXMS returned %d\n", status);
 199                 return false;
 200         }
 201
 202         obj = retn.pointer;
 203         if (obj->type == ACPI_TYPE_BUFFER) {
 204                 mxm->mxms = kmemdup(obj->buffer.pointer,
 205                                          obj->buffer.length, GFP_KERNEL);
 206         }
 207
 208         kfree(obj);
 209         return mxm->mxms != NULL;
 210 }
 211 #endif
 212
 213 static struct mxm_shadow_h {
 214         const char *name;
 215         bool (*exec)(struct nouveau_mxm *, u8 version);
 216 } _mxm_shadow[] = {
 217         { "ROM", mxm_shadow_rom },
 218 #if defined(CONFIG_ACPI)
 219         { "DSM", mxm_shadow_dsm },
 220 #endif
 221 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 222         { "WMI", mxm_shadow_wmi },
 223 #endif
 224         {}
 225 };
 226
 227 static int
 228 mxm_shadow(struct nouveau_mxm *mxm, u8 version)
 229 {
 230         struct mxm_shadow_h *shadow = _mxm_shadow;
 231         do {
 232                 nv_debug(mxm, "checking %s\n", shadow->name);
 233                 if (shadow->exec(mxm, version)) {
 234                         if (mxms_valid(mxm))
 235                                 return 0;
 236                         kfree(mxm->mxms);
 237                         mxm->mxms = NULL;
 238                 }
 239         } while ((++shadow)->name);
 240         return -ENOENT;
 241 }
 242
 243 int
 244 nouveau_mxm_create_(struct nouveau_object *parent,
 245                     struct nouveau_object *engine,
 246                     struct nouveau_oclass *oclass, int length, void **pobject)
 247 {
 248         struct nouveau_device *device = nv_device(parent);
 249         struct nouveau_bios *bios = nouveau_bios(device);
 250         struct nouveau_mxm *mxm;
 251         u8  ver, len;
 252         u16 data;
 253         int ret;
 254
 255         ret = nouveau_subdev_create_(parent, engine, oclass, 0, "MXM", "mxm",
 256                                      length, pobject);
 257         mxm = *pobject;
 258         if (ret)
 259                 return ret;
 260
 261         data = mxm_table(bios, &ver, &len);
 262         if (!data || !(ver = nv_ro08(bios, data))) {
 263                 nv_debug(mxm, "no VBIOS data, nothing to do\n");
 264                 return 0;
 265         }
 266
 267         nv_info(mxm, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
 268
 269         if (mxm_shadow(mxm, ver)) {
 270                 nv_info(mxm, "failed to locate valid SIS\n");
 271 #if 0
 272                 /* we should, perhaps, fall back to some kind of limited
 273                  * mode here if the x86 vbios hasn't already done the
 274                  * work for us (so we prevent loading with completely
 275                  * whacked vbios tables).
 276                  */
 277                 return -EINVAL;
 278 #else
 279                 return 0;
 280 #endif
 281         }
 282
 283         nv_info(mxm, "MXMS Version %d.%d\n",
 284                 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
 285         mxms_foreach(mxm, 0, NULL, NULL);
 286
 287         if (nouveau_boolopt(device->cfgopt, "NvMXMDCB", true))
 288                 mxm->action |= MXM_SANITISE_DCB;
 289         return 0;
 290 }