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 argv4 = {
  91                 .buffer.type = ACPI_TYPE_BUFFER,
  92                 .buffer.length = sizeof(mxms_args),
  93                 .buffer.pointer = (char *)mxms_args,
  94         };
  95         union acpi_object *obj;
  96         acpi_handle handle;
  97         int rev;
  98
  99         handle = ACPI_HANDLE(&device->pdev->dev);
 100         if (!handle)
 101                 return false;
 102
 103         /*
 104          * spec says this can be zero to mean "highest revision", but
 105          * of course there's at least one bios out there which fails
 106          * unless you pass in exactly the version it supports..
 107          */
 108         rev = (version & 0xf0) << 4 | (version & 0x0f);
 109         obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4);
 110         if (!obj) {
 111                 nv_debug(mxm, "DSM MXMS failed\n");
 112                 return false;
 113         }
 114
 115         if (obj->type == ACPI_TYPE_BUFFER) {
 116                 mxm->mxms = kmemdup(obj->buffer.pointer,
 117                                          obj->buffer.length, GFP_KERNEL);
 118         } else if (obj->type == ACPI_TYPE_INTEGER) {
 119                 nv_debug(mxm, "DSM MXMS returned 0x%llx\n", obj->integer.value);
 120         }
 121
 122         ACPI_FREE(obj);
 123         return mxm->mxms != NULL;
 124 }
 125 #endif
 126
 127 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 128
 129 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
 130
 131 static u8
 132 wmi_wmmx_mxmi(struct nouveau_mxm *mxm, u8 version)
 133 {
 134         u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
 135         struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
 136         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 137         union acpi_object *obj;
 138         acpi_status status;
 139
 140         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 141         if (ACPI_FAILURE(status)) {
 142                 nv_debug(mxm, "WMMX MXMI returned %d\n", status);
 143                 return 0x00;
 144         }
 145
 146         obj = retn.pointer;
 147         if (obj->type == ACPI_TYPE_INTEGER) {
 148                 version = obj->integer.value;
 149                 nv_debug(mxm, "WMMX MXMI version %d.%d\n",
 150                              (version >> 4), version & 0x0f);
 151         } else {
 152                 version = 0;
 153                 nv_debug(mxm, "WMMX MXMI returned non-integer\n");
 154         }
 155
 156         kfree(obj);
 157         return version;
 158 }
 159
 160 static bool
 161 mxm_shadow_wmi(struct nouveau_mxm *mxm, u8 version)
 162 {
 163         u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
 164         struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
 165         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 166         union acpi_object *obj;
 167         acpi_status status;
 168
 169         if (!wmi_has_guid(WMI_WMMX_GUID)) {
 170                 nv_debug(mxm, "WMMX GUID not found\n");
 171                 return false;
 172         }
 173
 174         mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
 175         if (!mxms_args[1])
 176                 mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
 177         if (!mxms_args[1])
 178                 return false;
 179
 180         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 181         if (ACPI_FAILURE(status)) {
 182                 nv_debug(mxm, "WMMX MXMS returned %d\n", status);
 183                 return false;
 184         }
 185
 186         obj = retn.pointer;
 187         if (obj->type == ACPI_TYPE_BUFFER) {
 188                 mxm->mxms = kmemdup(obj->buffer.pointer,
 189                                          obj->buffer.length, GFP_KERNEL);
 190         }
 191
 192         kfree(obj);
 193         return mxm->mxms != NULL;
 194 }
 195 #endif
 196
 197 static struct mxm_shadow_h {
 198         const char *name;
 199         bool (*exec)(struct nouveau_mxm *, u8 version);
 200 } _mxm_shadow[] = {
 201         { "ROM", mxm_shadow_rom },
 202 #if defined(CONFIG_ACPI)
 203         { "DSM", mxm_shadow_dsm },
 204 #endif
 205 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 206         { "WMI", mxm_shadow_wmi },
 207 #endif
 208         {}
 209 };
 210
 211 static int
 212 mxm_shadow(struct nouveau_mxm *mxm, u8 version)
 213 {
 214         struct mxm_shadow_h *shadow = _mxm_shadow;
 215         do {
 216                 nv_debug(mxm, "checking %s\n", shadow->name);
 217                 if (shadow->exec(mxm, version)) {
 218                         if (mxms_valid(mxm))
 219                                 return 0;
 220                         kfree(mxm->mxms);
 221                         mxm->mxms = NULL;
 222                 }
 223         } while ((++shadow)->name);
 224         return -ENOENT;
 225 }
 226
 227 int
 228 nouveau_mxm_create_(struct nouveau_object *parent,
 229                     struct nouveau_object *engine,
 230                     struct nouveau_oclass *oclass, int length, void **pobject)
 231 {
 232         struct nouveau_device *device = nv_device(parent);
 233         struct nouveau_bios *bios = nouveau_bios(device);
 234         struct nouveau_mxm *mxm;
 235         u8  ver, len;
 236         u16 data;
 237         int ret;
 238
 239         ret = nouveau_subdev_create_(parent, engine, oclass, 0, "MXM", "mxm",
 240                                      length, pobject);
 241         mxm = *pobject;
 242         if (ret)
 243                 return ret;
 244
 245         data = mxm_table(bios, &ver, &len);
 246         if (!data || !(ver = nv_ro08(bios, data))) {
 247                 nv_debug(mxm, "no VBIOS data, nothing to do\n");
 248                 return 0;
 249         }
 250
 251         nv_info(mxm, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
 252
 253         if (mxm_shadow(mxm, ver)) {
 254                 nv_info(mxm, "failed to locate valid SIS\n");
 255 #if 0
 256                 /* we should, perhaps, fall back to some kind of limited
 257                  * mode here if the x86 vbios hasn't already done the
 258                  * work for us (so we prevent loading with completely
 259                  * whacked vbios tables).
 260                  */
 261                 return -EINVAL;
 262 #else
 263                 return 0;
 264 #endif
 265         }
 266
 267         nv_info(mxm, "MXMS Version %d.%d\n",
 268                 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
 269         mxms_foreach(mxm, 0, NULL, NULL);
 270
 271         if (nouveau_boolopt(device->cfgopt, "NvMXMDCB", true))
 272                 mxm->action |= MXM_SANITISE_DCB;
 273         return 0;
 274 }