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 char muid[] = { 85 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C, 86 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65 87 }; 88 u32 mxms_args[] = { 0x00000000 }; 89 union acpi_object argv4 = { 90 .buffer.type = ACPI_TYPE_BUFFER, 91 .buffer.length = sizeof(mxms_args), 92 .buffer.pointer = (char *)mxms_args, 93 }; 94 union acpi_object *obj; 95 acpi_handle handle; 96 int rev; 97 98 handle = ACPI_HANDLE(device->dev); 99 if (!handle) 100 return false; 101 102 /* 103 * spec says this can be zero to mean "highest revision", but 104 * of course there's at least one bios out there which fails 105 * unless you pass in exactly the version it supports.. 106 */ 107 rev = (version & 0xf0) << 4 | (version & 0x0f); 108 obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4); 109 if (!obj) { 110 nvkm_debug(subdev, "DSM MXMS failed\n"); 111 return false; 112 } 113 114 if (obj->type == ACPI_TYPE_BUFFER) { 115 mxm->mxms = kmemdup(obj->buffer.pointer, 116 obj->buffer.length, GFP_KERNEL); 117 } else if (obj->type == ACPI_TYPE_INTEGER) { 118 nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n", 119 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 nvkm_mxm *mxm, u8 version) 133 { 134 struct nvkm_subdev *subdev = &mxm->subdev; 135 u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 }; 136 struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args }; 137 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 138 union acpi_object *obj; 139 acpi_status status; 140 141 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 142 if (ACPI_FAILURE(status)) { 143 nvkm_debug(subdev, "WMMX MXMI returned %d\n", status); 144 return 0x00; 145 } 146 147 obj = retn.pointer; 148 if (obj->type == ACPI_TYPE_INTEGER) { 149 version = obj->integer.value; 150 nvkm_debug(subdev, "WMMX MXMI version %d.%d\n", 151 (version >> 4), version & 0x0f); 152 } else { 153 version = 0; 154 nvkm_debug(subdev, "WMMX MXMI returned non-integer\n"); 155 } 156 157 kfree(obj); 158 return version; 159 } 160 161 static bool 162 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version) 163 { 164 struct nvkm_subdev *subdev = &mxm->subdev; 165 u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 }; 166 struct acpi_buffer args = { sizeof(mxms_args), mxms_args }; 167 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 168 union acpi_object *obj; 169 acpi_status status; 170 171 if (!wmi_has_guid(WMI_WMMX_GUID)) { 172 nvkm_debug(subdev, "WMMX GUID not found\n"); 173 return false; 174 } 175 176 mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00); 177 if (!mxms_args[1]) 178 mxms_args[1] = wmi_wmmx_mxmi(mxm, version); 179 if (!mxms_args[1]) 180 return false; 181 182 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 183 if (ACPI_FAILURE(status)) { 184 nvkm_debug(subdev, "WMMX MXMS returned %d\n", status); 185 return false; 186 } 187 188 obj = retn.pointer; 189 if (obj->type == ACPI_TYPE_BUFFER) { 190 mxm->mxms = kmemdup(obj->buffer.pointer, 191 obj->buffer.length, GFP_KERNEL); 192 } 193 194 kfree(obj); 195 return mxm->mxms != NULL; 196 } 197 #endif 198 199 static struct mxm_shadow_h { 200 const char *name; 201 bool (*exec)(struct nvkm_mxm *, u8 version); 202 } _mxm_shadow[] = { 203 { "ROM", mxm_shadow_rom }, 204 #if defined(CONFIG_ACPI) 205 { "DSM", mxm_shadow_dsm }, 206 #endif 207 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) 208 { "WMI", mxm_shadow_wmi }, 209 #endif 210 {} 211 }; 212 213 static int 214 mxm_shadow(struct nvkm_mxm *mxm, u8 version) 215 { 216 struct mxm_shadow_h *shadow = _mxm_shadow; 217 do { 218 nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name); 219 if (shadow->exec(mxm, version)) { 220 if (mxms_valid(mxm)) 221 return 0; 222 kfree(mxm->mxms); 223 mxm->mxms = NULL; 224 } 225 } while ((++shadow)->name); 226 return -ENOENT; 227 } 228 229 static const struct nvkm_subdev_func 230 nvkm_mxm = { 231 }; 232 233 int 234 nvkm_mxm_new_(struct nvkm_device *device, int index, 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, index, &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