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, 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 0 261 /* we should, perhaps, fall back to some kind of limited 262 * mode here if the x86 vbios hasn't already done the 263 * work for us (so we prevent loading with completely 264 * whacked vbios tables). 265 */ 266 return -EINVAL; 267 #else 268 return 0; 269 #endif 270 } 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