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/device.h> 27 #include <core/option.h> 28 #include <subdev/bios.h> 29 #include <subdev/bios/mxm.h> 30 #include <subdev/i2c.h> 31 32 static bool 33 mxm_shadow_rom_fetch(struct nvkm_i2c_port *i2c, u8 addr, 34 u8 offset, u8 size, u8 *data) 35 { 36 struct i2c_msg msgs[] = { 37 { .addr = addr, .flags = 0, .len = 1, .buf = &offset }, 38 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, }, 39 }; 40 41 return i2c_transfer(&i2c->adapter, msgs, 2) == 2; 42 } 43 44 static bool 45 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version) 46 { 47 struct nvkm_bios *bios = nvkm_bios(mxm); 48 struct nvkm_i2c *i2c = nvkm_i2c(mxm); 49 struct nvkm_i2c_port *port = NULL; 50 u8 i2cidx, mxms[6], addr, size; 51 52 i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f; 53 if (i2cidx < 0x0f) 54 port = i2c->find(i2c, i2cidx); 55 if (!port) 56 return false; 57 58 addr = 0x54; 59 if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) { 60 addr = 0x56; 61 if (!mxm_shadow_rom_fetch(port, 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(port, 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_device *device = nv_device(mxm); 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 nv_debug(mxm, "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 nv_debug(mxm, "DSM MXMS returned 0x%llx\n", obj->integer.value); 118 } 119 120 ACPI_FREE(obj); 121 return mxm->mxms != NULL; 122 } 123 #endif 124 125 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) 126 127 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0" 128 129 static u8 130 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version) 131 { 132 u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 }; 133 struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args }; 134 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 135 union acpi_object *obj; 136 acpi_status status; 137 138 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 139 if (ACPI_FAILURE(status)) { 140 nv_debug(mxm, "WMMX MXMI returned %d\n", status); 141 return 0x00; 142 } 143 144 obj = retn.pointer; 145 if (obj->type == ACPI_TYPE_INTEGER) { 146 version = obj->integer.value; 147 nv_debug(mxm, "WMMX MXMI version %d.%d\n", 148 (version >> 4), version & 0x0f); 149 } else { 150 version = 0; 151 nv_debug(mxm, "WMMX MXMI returned non-integer\n"); 152 } 153 154 kfree(obj); 155 return version; 156 } 157 158 static bool 159 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version) 160 { 161 u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 }; 162 struct acpi_buffer args = { sizeof(mxms_args), mxms_args }; 163 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; 164 union acpi_object *obj; 165 acpi_status status; 166 167 if (!wmi_has_guid(WMI_WMMX_GUID)) { 168 nv_debug(mxm, "WMMX GUID not found\n"); 169 return false; 170 } 171 172 mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00); 173 if (!mxms_args[1]) 174 mxms_args[1] = wmi_wmmx_mxmi(mxm, version); 175 if (!mxms_args[1]) 176 return false; 177 178 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); 179 if (ACPI_FAILURE(status)) { 180 nv_debug(mxm, "WMMX MXMS returned %d\n", status); 181 return false; 182 } 183 184 obj = retn.pointer; 185 if (obj->type == ACPI_TYPE_BUFFER) { 186 mxm->mxms = kmemdup(obj->buffer.pointer, 187 obj->buffer.length, GFP_KERNEL); 188 } 189 190 kfree(obj); 191 return mxm->mxms != NULL; 192 } 193 #endif 194 195 static struct mxm_shadow_h { 196 const char *name; 197 bool (*exec)(struct nvkm_mxm *, u8 version); 198 } _mxm_shadow[] = { 199 { "ROM", mxm_shadow_rom }, 200 #if defined(CONFIG_ACPI) 201 { "DSM", mxm_shadow_dsm }, 202 #endif 203 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) 204 { "WMI", mxm_shadow_wmi }, 205 #endif 206 {} 207 }; 208 209 static int 210 mxm_shadow(struct nvkm_mxm *mxm, u8 version) 211 { 212 struct mxm_shadow_h *shadow = _mxm_shadow; 213 do { 214 nv_debug(mxm, "checking %s\n", shadow->name); 215 if (shadow->exec(mxm, version)) { 216 if (mxms_valid(mxm)) 217 return 0; 218 kfree(mxm->mxms); 219 mxm->mxms = NULL; 220 } 221 } while ((++shadow)->name); 222 return -ENOENT; 223 } 224 225 int 226 nvkm_mxm_create_(struct nvkm_object *parent, struct nvkm_object *engine, 227 struct nvkm_oclass *oclass, int length, void **pobject) 228 { 229 struct nvkm_device *device = nv_device(parent); 230 struct nvkm_bios *bios = nvkm_bios(device); 231 struct nvkm_mxm *mxm; 232 u8 ver, len; 233 u16 data; 234 int ret; 235 236 ret = nvkm_subdev_create_(parent, engine, oclass, 0, "MXM", "mxm", 237 length, pobject); 238 mxm = *pobject; 239 if (ret) 240 return ret; 241 242 data = mxm_table(bios, &ver, &len); 243 if (!data || !(ver = nv_ro08(bios, data))) { 244 nv_debug(mxm, "no VBIOS data, nothing to do\n"); 245 return 0; 246 } 247 248 nv_info(mxm, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f); 249 250 if (mxm_shadow(mxm, ver)) { 251 nv_info(mxm, "failed to locate valid SIS\n"); 252 #if 0 253 /* we should, perhaps, fall back to some kind of limited 254 * mode here if the x86 vbios hasn't already done the 255 * work for us (so we prevent loading with completely 256 * whacked vbios tables). 257 */ 258 return -EINVAL; 259 #else 260 return 0; 261 #endif 262 } 263 264 nv_info(mxm, "MXMS Version %d.%d\n", 265 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff); 266 mxms_foreach(mxm, 0, NULL, NULL); 267 268 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true)) 269 mxm->action |= MXM_SANITISE_DCB; 270 return 0; 271 } 272