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_port *i2c, 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(&i2c->adapter, msgs, 2) == 2; 41 } 42 43 static bool 44 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version) 45 { 46 struct nvkm_bios *bios = nvkm_bios(mxm); 47 struct nvkm_i2c *i2c = nvkm_i2c(mxm); 48 struct nvkm_i2c_port *port = NULL; 49 u8 i2cidx, mxms[6], addr, size; 50 51 i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f; 52 if (i2cidx < 0x0f) 53 port = i2c->find(i2c, i2cidx); 54 if (!port) 55 return false; 56 57 addr = 0x54; 58 if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) { 59 addr = 0x56; 60 if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) 61 return false; 62 } 63 64 mxm->mxms = mxms; 65 size = mxms_headerlen(mxm) + mxms_structlen(mxm); 66 mxm->mxms = kmalloc(size, GFP_KERNEL); 67 68 if (mxm->mxms && 69 mxm_shadow_rom_fetch(port, addr, 0, size, mxm->mxms)) 70 return true; 71 72 kfree(mxm->mxms); 73 mxm->mxms = NULL; 74 return false; 75 } 76 77 #if defined(CONFIG_ACPI) 78 static bool 79 mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version) 80 { 81 struct nvkm_subdev *subdev = &mxm->subdev; 82 struct nvkm_device *device = subdev->device; 83 static char muid[] = { 84 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C, 85 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65 86 }; 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(nv_device_base(device)); 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 int 229 nvkm_mxm_create_(struct nvkm_object *parent, struct nvkm_object *engine, 230 struct nvkm_oclass *oclass, int length, void **pobject) 231 { 232 struct nvkm_device *device = nv_device(parent); 233 struct nvkm_bios *bios = nvkm_bios(device); 234 struct nvkm_mxm *mxm; 235 u8 ver, len; 236 u16 data; 237 int ret; 238 239 ret = nvkm_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 = 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); 252 253 if (mxm_shadow(mxm, ver)) { 254 nvkm_warn(&mxm->subdev, "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 nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n", 268 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff); 269 mxms_foreach(mxm, 0, NULL, NULL); 270 271 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true)) 272 mxm->action |= MXM_SANITISE_DCB; 273 return 0; 274 } 275