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_device *device = nv_device(mxm); 82 static char muid[] = { 83 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C, 84 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65 85 }; 86 u32 mxms_args[] = { 0x00000000 }; 87 union acpi_object argv4 = { 88 .buffer.type = ACPI_TYPE_BUFFER, 89 .buffer.length = sizeof(mxms_args), 90 .buffer.pointer = (char *)mxms_args, 91 }; 92 union acpi_object *obj; 93 acpi_handle handle; 94 int rev; 95 96 handle = ACPI_HANDLE(nv_device_base(device)); 97 if (!handle) 98 return false; 99 100 /* 101 * spec says this can be zero to mean "highest revision", but 102 * of course there's at least one bios out there which fails 103 * unless you pass in exactly the version it supports.. 104 */ 105 rev = (version & 0xf0) << 4 | (version & 0x0f); 106 obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4); 107 if (!obj) { 108 nv_debug(mxm, "DSM MXMS failed\n"); 109 return false; 110 } 111 112 if (obj->type == ACPI_TYPE_BUFFER) { 113 mxm->mxms = kmemdup(obj->buffer.pointer, 114 obj->buffer.length, GFP_KERNEL); 115 } else if (obj->type == ACPI_TYPE_INTEGER) { 116 nv_debug(mxm, "DSM MXMS returned 0x%llx\n", obj->integer.value); 117 } 118 119 ACPI_FREE(obj); 120 return mxm->mxms != NULL; 121 } 122 #endif 123 124 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) 125 126 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0" 127 128 static u8 129 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version) 130 { 131 u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 }; 132 struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args }; 133 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 134 union acpi_object *obj; 135 acpi_status status; 136 137 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 138 if (ACPI_FAILURE(status)) { 139 nv_debug(mxm, "WMMX MXMI returned %d\n", status); 140 return 0x00; 141 } 142 143 obj = retn.pointer; 144 if (obj->type == ACPI_TYPE_INTEGER) { 145 version = obj->integer.value; 146 nv_debug(mxm, "WMMX MXMI version %d.%d\n", 147 (version >> 4), version & 0x0f); 148 } else { 149 version = 0; 150 nv_debug(mxm, "WMMX MXMI returned non-integer\n"); 151 } 152 153 kfree(obj); 154 return version; 155 } 156 157 static bool 158 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version) 159 { 160 u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 }; 161 struct acpi_buffer args = { sizeof(mxms_args), mxms_args }; 162 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 163 union acpi_object *obj; 164 acpi_status status; 165 166 if (!wmi_has_guid(WMI_WMMX_GUID)) { 167 nv_debug(mxm, "WMMX GUID not found\n"); 168 return false; 169 } 170 171 mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00); 172 if (!mxms_args[1]) 173 mxms_args[1] = wmi_wmmx_mxmi(mxm, version); 174 if (!mxms_args[1]) 175 return false; 176 177 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 178 if (ACPI_FAILURE(status)) { 179 nv_debug(mxm, "WMMX MXMS returned %d\n", status); 180 return false; 181 } 182 183 obj = retn.pointer; 184 if (obj->type == ACPI_TYPE_BUFFER) { 185 mxm->mxms = kmemdup(obj->buffer.pointer, 186 obj->buffer.length, GFP_KERNEL); 187 } 188 189 kfree(obj); 190 return mxm->mxms != NULL; 191 } 192 #endif 193 194 static struct mxm_shadow_h { 195 const char *name; 196 bool (*exec)(struct nvkm_mxm *, u8 version); 197 } _mxm_shadow[] = { 198 { "ROM", mxm_shadow_rom }, 199 #if defined(CONFIG_ACPI) 200 { "DSM", mxm_shadow_dsm }, 201 #endif 202 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) 203 { "WMI", mxm_shadow_wmi }, 204 #endif 205 {} 206 }; 207 208 static int 209 mxm_shadow(struct nvkm_mxm *mxm, u8 version) 210 { 211 struct mxm_shadow_h *shadow = _mxm_shadow; 212 do { 213 nv_debug(mxm, "checking %s\n", shadow->name); 214 if (shadow->exec(mxm, version)) { 215 if (mxms_valid(mxm)) 216 return 0; 217 kfree(mxm->mxms); 218 mxm->mxms = NULL; 219 } 220 } while ((++shadow)->name); 221 return -ENOENT; 222 } 223 224 int 225 nvkm_mxm_create_(struct nvkm_object *parent, struct nvkm_object *engine, 226 struct nvkm_oclass *oclass, int length, void **pobject) 227 { 228 struct nvkm_device *device = nv_device(parent); 229 struct nvkm_bios *bios = nvkm_bios(device); 230 struct nvkm_mxm *mxm; 231 u8 ver, len; 232 u16 data; 233 int ret; 234 235 ret = nvkm_subdev_create_(parent, engine, oclass, 0, "MXM", "mxm", 236 length, pobject); 237 mxm = *pobject; 238 if (ret) 239 return ret; 240 241 data = mxm_table(bios, &ver, &len); 242 if (!data || !(ver = nv_ro08(bios, data))) { 243 nv_debug(mxm, "no VBIOS data, nothing to do\n"); 244 return 0; 245 } 246 247 nv_info(mxm, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f); 248 249 if (mxm_shadow(mxm, ver)) { 250 nv_info(mxm, "failed to locate valid SIS\n"); 251 #if 0 252 /* we should, perhaps, fall back to some kind of limited 253 * mode here if the x86 vbios hasn't already done the 254 * work for us (so we prevent loading with completely 255 * whacked vbios tables). 256 */ 257 return -EINVAL; 258 #else 259 return 0; 260 #endif 261 } 262 263 nv_info(mxm, "MXMS Version %d.%d\n", 264 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff); 265 mxms_foreach(mxm, 0, NULL, NULL); 266 267 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true)) 268 mxm->action |= MXM_SANITISE_DCB; 269 return 0; 270 } 271