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1/*2 * Copyright 2011 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Ben Skeggs23 */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 31static bool32mxm_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 43static bool44mxm_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)79static bool80mxm_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", but103 * of course there's at least one bios out there which fails104 * 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#endif125 126#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)127 128#define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"129 130static u8131wmi_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 160static bool161mxm_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#endif197 198static 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#endif206#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)207 { "WMI", mxm_shadow_wmi },208#endif209 {}210};211 212static int213mxm_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 228static const struct nvkm_subdev_func229nvkm_mxm = {230};231 232int233nvkm_mxm_new_(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,234 struct nvkm_mxm **pmxm)235{236 struct nvkm_bios *bios = device->bios;237 struct nvkm_mxm *mxm;238 u8 ver, len;239 u16 data;240 241 if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))242 return -ENOMEM;243 244 nvkm_subdev_ctor(&nvkm_mxm, device, type, inst, &mxm->subdev);245 246 data = mxm_table(bios, &ver, &len);247 if (!data || !(ver = nvbios_rd08(bios, data))) {248 nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");249 return 0;250 }251 252 nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);253 nvkm_debug(&mxm->subdev, "module flags: %02x\n",254 nvbios_rd08(bios, data + 0x01));255 nvkm_debug(&mxm->subdev, "config flags: %02x\n",256 nvbios_rd08(bios, data + 0x02));257 258 if (mxm_shadow(mxm, ver)) {259 nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");260#if 0261 /* we should, perhaps, fall back to some kind of limited262 * mode here if the x86 vbios hasn't already done the263 * work for us (so we prevent loading with completely264 * whacked vbios tables).265 */266 return -EINVAL;267#else268 return 0;269#endif270 }271 272 nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",273 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);274 mxms_foreach(mxm, 0, NULL, NULL);275 276 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))277 mxm->action |= MXM_SANITISE_DCB;278 return 0;279}280