drivers/gpu/drm/nouveau/nvkm/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 #include "mxms.h"
  25
  26 #include <core/option.h>
  27 #include <subdev/bios.h>
  28 #include <subdev/bios/mxm.h>
  29 #include <subdev/i2c.h>
  30
  31 static bool
  32 mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
  33                      u8 offset, u8 size, u8 *data)
  34 {
  35         struct i2c_msg msgs[] = {
  36                 { .addr = addr, .flags = 0, .len = 1, .buf = &offset },
  37                 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
  38         };
  39
  40         return i2c_transfer(&bus->i2c, msgs, 2) == 2;
  41 }
  42
  43 static bool
  44 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
  45 {
  46         struct nvkm_device *device = mxm->subdev.device;
  47         struct nvkm_bios *bios = device->bios;
  48         struct nvkm_i2c *i2c = device->i2c;
  49         struct nvkm_i2c_bus *bus = NULL;
  50         u8 i2cidx, mxms[6], addr, size;
  51
  52         i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
  53         if (i2cidx < 0x0f)
  54                 bus = nvkm_i2c_bus_find(i2c, i2cidx);
  55         if (!bus)
  56                 return false;
  57
  58         addr = 0x54;
  59         if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
  60                 addr = 0x56;
  61                 if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
  62                         return false;
  63         }
  64
  65         mxm->mxms = mxms;
  66         size = mxms_headerlen(mxm) + mxms_structlen(mxm);
  67         mxm->mxms = kmalloc(size, GFP_KERNEL);
  68
  69         if (mxm->mxms &&
  70             mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
  71                 return true;
  72
  73         kfree(mxm->mxms);
  74         mxm->mxms = NULL;
  75         return false;
  76 }
  77
  78 #if defined(CONFIG_ACPI)
  79 static bool
  80 mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
  81 {
  82         struct nvkm_subdev *subdev = &mxm->subdev;
  83         struct nvkm_device *device = subdev->device;
  84         static guid_t muid =
  85                 GUID_INIT(0x4004A400, 0x917D, 0x4CF2,
  86                           0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65);
  87         u32 mxms_args[] = { 0x00000000 };
  88         union acpi_object argv4 = {
  89                 .buffer.type = ACPI_TYPE_BUFFER,
  90                 .buffer.length = sizeof(mxms_args),
  91                 .buffer.pointer = (char *)mxms_args,
  92         };
  93         union acpi_object *obj;
  94         acpi_handle handle;
  95         int rev;
  96
  97         handle = ACPI_HANDLE(device->dev);
  98         if (!handle)
  99                 return false;
 100
 101         /*
 102          * spec says this can be zero to mean "highest revision", but
 103          * of course there's at least one bios out there which fails
 104          * unless you pass in exactly the version it supports..
 105          */
 106         rev = (version & 0xf0) << 4 | (version & 0x0f);
 107         obj = acpi_evaluate_dsm(handle, &muid, rev, 0x00000010, &argv4);
 108         if (!obj) {
 109                 nvkm_debug(subdev, "DSM MXMS failed\n");
 110                 return false;
 111         }
 112
 113         if (obj->type == ACPI_TYPE_BUFFER) {
 114                 mxm->mxms = kmemdup(obj->buffer.pointer,
 115                                          obj->buffer.length, GFP_KERNEL);
 116         } else if (obj->type == ACPI_TYPE_INTEGER) {
 117                 nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
 118                            obj->integer.value);
 119         }
 120
 121         ACPI_FREE(obj);
 122         return mxm->mxms != NULL;
 123 }
 124 #endif
 125
 126 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 127
 128 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
 129
 130 static u8
 131 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
 132 {
 133         struct nvkm_subdev *subdev = &mxm->subdev;
 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                 nvkm_debug(subdev, "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                 nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
 150                            (version >> 4), version & 0x0f);
 151         } else {
 152                 version = 0;
 153                 nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
 154         }
 155
 156         kfree(obj);
 157         return version;
 158 }
 159
 160 static bool
 161 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
 162 {
 163         struct nvkm_subdev *subdev = &mxm->subdev;
 164         u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
 165         struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
 166         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 167         union acpi_object *obj;
 168         acpi_status status;
 169
 170         if (!wmi_has_guid(WMI_WMMX_GUID)) {
 171                 nvkm_debug(subdev, "WMMX GUID not found\n");
 172                 return false;
 173         }
 174
 175         mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
 176         if (!mxms_args[1])
 177                 mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
 178         if (!mxms_args[1])
 179                 return false;
 180
 181         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 182         if (ACPI_FAILURE(status)) {
 183                 nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
 184                 return false;
 185         }
 186
 187         obj = retn.pointer;
 188         if (obj->type == ACPI_TYPE_BUFFER) {
 189                 mxm->mxms = kmemdup(obj->buffer.pointer,
 190                                     obj->buffer.length, GFP_KERNEL);
 191         }
 192
 193         kfree(obj);
 194         return mxm->mxms != NULL;
 195 }
 196 #endif
 197
 198 static struct mxm_shadow_h {
 199         const char *name;
 200         bool (*exec)(struct nvkm_mxm *, u8 version);
 201 } _mxm_shadow[] = {
 202         { "ROM", mxm_shadow_rom },
 203 #if defined(CONFIG_ACPI)
 204         { "DSM", mxm_shadow_dsm },
 205 #endif
 206 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 207         { "WMI", mxm_shadow_wmi },
 208 #endif
 209         {}
 210 };
 211
 212 static int
 213 mxm_shadow(struct nvkm_mxm *mxm, u8 version)
 214 {
 215         struct mxm_shadow_h *shadow = _mxm_shadow;
 216         do {
 217                 nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
 218                 if (shadow->exec(mxm, version)) {
 219                         if (mxms_valid(mxm))
 220                                 return 0;
 221                         kfree(mxm->mxms);
 222                         mxm->mxms = NULL;
 223                 }
 224         } while ((++shadow)->name);
 225         return -ENOENT;
 226 }
 227
 228 static const struct nvkm_subdev_func
 229 nvkm_mxm = {
 230 };
 231
 232 int
 233 nvkm_mxm_new_(struct nvkm_device *device, int index, struct nvkm_mxm **pmxm)
 234 {
 235         struct nvkm_bios *bios = device->bios;
 236         struct nvkm_mxm *mxm;
 237         u8  ver, len;
 238         u16 data;
 239
 240         if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))
 241                 return -ENOMEM;
 242
 243         nvkm_subdev_ctor(&nvkm_mxm, device, index, &mxm->subdev);
 244
 245         data = mxm_table(bios, &ver, &len);
 246         if (!data || !(ver = nvbios_rd08(bios, data))) {
 247                 nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
 248                 return 0;
 249         }
 250
 251         nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
 252         nvkm_debug(&mxm->subdev, "module flags: %02x\n",
 253                    nvbios_rd08(bios, data + 0x01));
 254         nvkm_debug(&mxm->subdev, "config flags: %02x\n",
 255                    nvbios_rd08(bios, data + 0x02));
 256
 257         if (mxm_shadow(mxm, ver)) {
 258                 nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
 259 #if 0
 260                 /* we should, perhaps, fall back to some kind of limited
 261                  * mode here if the x86 vbios hasn't already done the
 262                  * work for us (so we prevent loading with completely
 263                  * whacked vbios tables).
 264                  */
 265                 return -EINVAL;
 266 #else
 267                 return 0;
 268 #endif
 269         }
 270
 271         nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
 272                    mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
 273         mxms_foreach(mxm, 0, NULL, NULL);
 274
 275         if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
 276                 mxm->action |= MXM_SANITISE_DCB;
 277         return 0;
 278 }