1 /*- 2 * Copyright (c) 2018 Stormshield. 3 * Copyright (c) 2018 Semihalf. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include "tpm20.h" 30 31 /* 32 * CRB register space as defined in 33 * TCG_PC_Client_Platform_TPM_Profile_PTP_2.0_r1.03_v22 34 */ 35 #define TPM_LOC_STATE 0x0 36 #define TPM_LOC_CTRL 0x8 37 #define TPM_LOC_STS 0xC 38 #define TPM_CRB_INTF_ID 0x30 39 #define TPM_CRB_CTRL_EXT 0x38 40 #define TPM_CRB_CTRL_REQ 0x40 41 #define TPM_CRB_CTRL_STS 0x44 42 #define TPM_CRB_CTRL_CANCEL 0x48 43 #define TPM_CRB_CTRL_START 0x4C 44 #define TPM_CRB_INT_ENABLE 0x50 45 #define TPM_CRB_INT_STS 0x54 46 #define TPM_CRB_CTRL_CMD_SIZE 0x58 47 #define TPM_CRB_CTRL_CMD_LADDR 0x5C 48 #define TPM_CRB_CTRL_CMD_HADDR 0x60 49 #define TPM_CRB_CTRL_RSP_SIZE 0x64 50 #define TPM_CRB_CTRL_RSP_ADDR 0x68 51 #define TPM_CRB_CTRL_RSP_HADDR 0x6c 52 #define TPM_CRB_DATA_BUFFER 0x80 53 54 #define TPM_LOC_STATE_ESTB BIT(0) 55 #define TPM_LOC_STATE_ASSIGNED BIT(1) 56 #define TPM_LOC_STATE_ACTIVE_MASK 0x9C 57 #define TPM_LOC_STATE_VALID BIT(7) 58 59 #define TPM_CRB_INTF_ID_TYPE_CRB 0x1 60 #define TPM_CRB_INTF_ID_TYPE 0x7 61 62 #define TPM_LOC_CTRL_REQUEST BIT(0) 63 #define TPM_LOC_CTRL_RELINQUISH BIT(1) 64 65 #define TPM_CRB_CTRL_REQ_GO_READY BIT(0) 66 #define TPM_CRB_CTRL_REQ_GO_IDLE BIT(1) 67 68 #define TPM_CRB_CTRL_STS_ERR_BIT BIT(0) 69 #define TPM_CRB_CTRL_STS_IDLE_BIT BIT(1) 70 71 #define TPM_CRB_CTRL_CANCEL_CMD 0x1 72 #define TPM_CRB_CTRL_CANCEL_CLEAR 0x0 73 74 #define TPM_CRB_CTRL_START_CMD BIT(0) 75 76 #define TPM_CRB_INT_ENABLE_BIT BIT(31) 77 78 struct tpmcrb_sc { 79 struct tpm_sc base; 80 bus_size_t cmd_off; 81 bus_size_t rsp_off; 82 size_t cmd_buf_size; 83 size_t rsp_buf_size; 84 }; 85 86 int tpmcrb_transmit(device_t dev, size_t size); 87 88 static int tpmcrb_acpi_probe(device_t dev); 89 static int tpmcrb_attach(device_t dev); 90 static int tpmcrb_detach(device_t dev); 91 92 static ACPI_STATUS tpmcrb_fix_buff_offsets(ACPI_RESOURCE *res, void *arg); 93 94 static bool tpm_wait_for_u32(struct tpm_sc *sc, bus_size_t off, 95 uint32_t mask, uint32_t val, int32_t timeout); 96 static bool tpmcrb_request_locality(struct tpm_sc *sc, int locality); 97 static void tpmcrb_relinquish_locality(struct tpm_sc *sc); 98 static bool tpmcrb_cancel_cmd(struct tpm_sc *sc); 99 100 char *tpmcrb_ids[] = {"MSFT0101", NULL}; 101 102 static int 103 tpmcrb_acpi_probe(device_t dev) 104 { 105 int err; 106 ACPI_TABLE_TPM23 *tbl; 107 ACPI_STATUS status; 108 err = ACPI_ID_PROBE(device_get_parent(dev), dev, tpmcrb_ids, NULL); 109 if (err > 0) 110 return (err); 111 /*Find TPM2 Header*/ 112 status = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **) &tbl); 113 if(ACPI_FAILURE(status) || 114 tbl->StartMethod != TPM2_START_METHOD_CRB) 115 return (ENXIO); 116 117 device_set_desc(dev, "Trusted Platform Module 2.0, CRB mode"); 118 return (err); 119 } 120 121 static ACPI_STATUS 122 tpmcrb_fix_buff_offsets(ACPI_RESOURCE *res, void *arg) 123 { 124 struct tpmcrb_sc *crb_sc; 125 size_t length; 126 uint32_t base_addr; 127 128 crb_sc = (struct tpmcrb_sc *)arg; 129 130 if (res->Type != ACPI_RESOURCE_TYPE_FIXED_MEMORY32) 131 return (AE_OK); 132 133 base_addr = res->Data.FixedMemory32.Address; 134 length = res->Data.FixedMemory32.AddressLength; 135 136 if (crb_sc->cmd_off > base_addr && crb_sc->cmd_off < base_addr + length) 137 crb_sc->cmd_off -= base_addr; 138 if (crb_sc->rsp_off > base_addr && crb_sc->rsp_off < base_addr + length) 139 crb_sc->rsp_off -= base_addr; 140 141 return (AE_OK); 142 } 143 144 static int 145 tpmcrb_attach(device_t dev) 146 { 147 struct tpmcrb_sc *crb_sc; 148 struct tpm_sc *sc; 149 ACPI_HANDLE handle; 150 ACPI_STATUS status; 151 int result; 152 153 crb_sc = device_get_softc(dev); 154 sc = &crb_sc->base; 155 handle = acpi_get_handle(dev); 156 sc->dev = dev; 157 158 sx_init(&sc->dev_lock, "TPM driver lock"); 159 sc->buf = malloc(TPM_BUFSIZE, M_TPM20, M_WAITOK); 160 161 sc->mem_rid = 0; 162 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->mem_rid, 163 RF_ACTIVE); 164 if (sc->mem_res == NULL) { 165 tpmcrb_detach(dev); 166 return (ENXIO); 167 } 168 169 if(!tpmcrb_request_locality(sc, 0)) { 170 tpmcrb_detach(dev); 171 return (ENXIO); 172 } 173 174 /* 175 * Disable all interrupts for now, since I don't have a device that 176 * works in CRB mode and supports them. 177 */ 178 AND4(sc, TPM_CRB_INT_ENABLE, ~TPM_CRB_INT_ENABLE_BIT); 179 sc->interrupts = false; 180 181 /* 182 * Read addresses of Tx/Rx buffers and their sizes. Note that they 183 * can be implemented by a single buffer. Also for some reason CMD 184 * addr is stored in two 4 byte neighboring registers, whereas RSP is 185 * stored in a single 8 byte one. 186 */ 187 #ifdef __amd64__ 188 crb_sc->rsp_off = TPM_READ_8(sc->dev, TPM_CRB_CTRL_RSP_ADDR); 189 #else 190 crb_sc->rsp_off = TPM_READ_4(sc->dev, TPM_CRB_CTRL_RSP_ADDR); 191 crb_sc->rsp_off |= ((uint64_t) TPM_READ_4(sc->dev, TPM_CRB_CTRL_RSP_HADDR) << 32); 192 #endif 193 crb_sc->cmd_off = TPM_READ_4(sc->dev, TPM_CRB_CTRL_CMD_LADDR); 194 crb_sc->cmd_off |= ((uint64_t) TPM_READ_4(sc->dev, TPM_CRB_CTRL_CMD_HADDR) << 32); 195 crb_sc->cmd_buf_size = TPM_READ_4(sc->dev, TPM_CRB_CTRL_CMD_SIZE); 196 crb_sc->rsp_buf_size = TPM_READ_4(sc->dev, TPM_CRB_CTRL_RSP_SIZE); 197 198 tpmcrb_relinquish_locality(sc); 199 200 /* Emulator returns address in acpi space instead of an offset */ 201 status = AcpiWalkResources(handle, "_CRS", tpmcrb_fix_buff_offsets, 202 (void *)crb_sc); 203 if (ACPI_FAILURE(status)) { 204 tpmcrb_detach(dev); 205 return (ENXIO); 206 } 207 208 if (crb_sc->rsp_off == crb_sc->cmd_off) { 209 /* 210 * If Tx/Rx buffers are implemented as one they have to be of 211 * same size 212 */ 213 if (crb_sc->cmd_buf_size != crb_sc->rsp_buf_size) { 214 device_printf(sc->dev, 215 "Overlapping Tx/Rx buffers have different sizes\n"); 216 tpmcrb_detach(dev); 217 return (ENXIO); 218 } 219 } 220 221 result = tpm20_init(sc); 222 if (result != 0) 223 tpmcrb_detach(dev); 224 225 return (result); 226 } 227 228 static int 229 tpmcrb_detach(device_t dev) 230 { 231 struct tpm_sc *sc; 232 233 sc = device_get_softc(dev); 234 tpm20_release(sc); 235 236 if (sc->mem_res != NULL) 237 bus_release_resource(dev, SYS_RES_MEMORY, 238 sc->mem_rid, sc->mem_res); 239 240 return (0); 241 } 242 243 static bool 244 tpm_wait_for_u32(struct tpm_sc *sc, bus_size_t off, uint32_t mask, uint32_t val, 245 int32_t timeout) 246 { 247 248 /* Check for condition */ 249 if ((TPM_READ_4(sc->dev, off) & mask) == val) 250 return (true); 251 252 while (timeout > 0) { 253 if ((TPM_READ_4(sc->dev, off) & mask) == val) 254 return (true); 255 256 pause("TPM in polling mode", 1); 257 timeout -= tick; 258 } 259 return (false); 260 } 261 262 static bool 263 tpmcrb_request_locality(struct tpm_sc *sc, int locality) 264 { 265 uint32_t mask; 266 267 /* Currently we only support Locality 0 */ 268 if (locality != 0) 269 return (false); 270 271 mask = TPM_LOC_STATE_VALID | TPM_LOC_STATE_ASSIGNED; 272 273 OR4(sc, TPM_LOC_CTRL, TPM_LOC_CTRL_REQUEST); 274 if (!tpm_wait_for_u32(sc, TPM_LOC_STATE, mask, mask, TPM_TIMEOUT_C)) 275 return (false); 276 277 return (true); 278 } 279 280 static void 281 tpmcrb_relinquish_locality(struct tpm_sc *sc) 282 { 283 284 OR4(sc, TPM_LOC_CTRL, TPM_LOC_CTRL_RELINQUISH); 285 } 286 287 static bool 288 tpmcrb_cancel_cmd(struct tpm_sc *sc) 289 { 290 uint32_t mask = ~0; 291 292 TPM_WRITE_4(sc->dev, TPM_CRB_CTRL_CANCEL, TPM_CRB_CTRL_CANCEL_CMD); 293 if (!tpm_wait_for_u32(sc, TPM_CRB_CTRL_START, 294 mask, ~mask, TPM_TIMEOUT_B)) { 295 device_printf(sc->dev, 296 "Device failed to cancel command\n"); 297 return (false); 298 } 299 300 TPM_WRITE_4(sc->dev, TPM_CRB_CTRL_CANCEL, TPM_CRB_CTRL_CANCEL_CLEAR); 301 return (true); 302 } 303 304 int 305 tpmcrb_transmit(device_t dev, size_t length) 306 { 307 struct tpmcrb_sc *crb_sc; 308 struct tpm_sc *sc; 309 uint32_t mask, curr_cmd; 310 int timeout, bytes_available; 311 312 crb_sc = device_get_softc(dev); 313 sc = &crb_sc->base; 314 315 sx_assert(&sc->dev_lock, SA_XLOCKED); 316 317 if (length > crb_sc->cmd_buf_size) { 318 device_printf(dev, 319 "Requested transfer is bigger than buffer size\n"); 320 return (E2BIG); 321 } 322 323 if (TPM_READ_4(dev, TPM_CRB_CTRL_STS) & TPM_CRB_CTRL_STS_ERR_BIT) { 324 device_printf(dev, 325 "Device has Error bit set\n"); 326 return (EIO); 327 } 328 if (!tpmcrb_request_locality(sc, 0)) { 329 device_printf(dev, 330 "Failed to obtain locality\n"); 331 return (EIO); 332 } 333 /* Clear cancellation bit */ 334 TPM_WRITE_4(dev, TPM_CRB_CTRL_CANCEL, TPM_CRB_CTRL_CANCEL_CLEAR); 335 336 /* Switch device to idle state if necessary */ 337 if (!(TPM_READ_4(dev, TPM_CRB_CTRL_STS) & TPM_CRB_CTRL_STS_IDLE_BIT)) { 338 OR4(sc, TPM_CRB_CTRL_REQ, TPM_CRB_CTRL_REQ_GO_IDLE); 339 340 mask = TPM_CRB_CTRL_STS_IDLE_BIT; 341 if (!tpm_wait_for_u32(sc, TPM_CRB_CTRL_STS, 342 mask, mask, TPM_TIMEOUT_C)) { 343 device_printf(dev, 344 "Failed to transition to idle state\n"); 345 return (EIO); 346 } 347 } 348 /* Switch to ready state */ 349 OR4(sc, TPM_CRB_CTRL_REQ, TPM_CRB_CTRL_REQ_GO_READY); 350 351 mask = TPM_CRB_CTRL_REQ_GO_READY; 352 if (!tpm_wait_for_u32(sc, TPM_CRB_CTRL_STS, 353 mask, !mask, TPM_TIMEOUT_C)) { 354 device_printf(dev, 355 "Failed to transition to ready state\n"); 356 return (EIO); 357 } 358 359 /* 360 * Calculate timeout for current command. 361 * Command code is passed in bytes 6-10. 362 */ 363 curr_cmd = be32toh(*(uint32_t *) (&sc->buf[6])); 364 timeout = tpm20_get_timeout(curr_cmd); 365 366 /* Send command and tell device to process it. */ 367 bus_write_region_stream_1(sc->mem_res, crb_sc->cmd_off, 368 sc->buf, length); 369 TPM_WRITE_BARRIER(dev, crb_sc->cmd_off, length); 370 371 TPM_WRITE_4(dev, TPM_CRB_CTRL_START, TPM_CRB_CTRL_START_CMD); 372 TPM_WRITE_BARRIER(dev, TPM_CRB_CTRL_START, 4); 373 374 mask = ~0; 375 if (!tpm_wait_for_u32(sc, TPM_CRB_CTRL_START, mask, ~mask, timeout)) { 376 device_printf(dev, 377 "Timeout while waiting for device to process cmd\n"); 378 if (!tpmcrb_cancel_cmd(sc)) 379 return (EIO); 380 } 381 382 /* Read response header. Length is passed in bytes 2 - 6. */ 383 bus_read_region_stream_1(sc->mem_res, crb_sc->rsp_off, 384 sc->buf, TPM_HEADER_SIZE); 385 bytes_available = be32toh(*(uint32_t *) (&sc->buf[2])); 386 387 if (bytes_available > TPM_BUFSIZE || bytes_available < TPM_HEADER_SIZE) { 388 device_printf(dev, 389 "Incorrect response size: %d\n", 390 bytes_available); 391 return (EIO); 392 } 393 394 bus_read_region_stream_1(sc->mem_res, crb_sc->rsp_off + TPM_HEADER_SIZE, 395 &sc->buf[TPM_HEADER_SIZE], bytes_available - TPM_HEADER_SIZE); 396 397 OR4(sc, TPM_CRB_CTRL_REQ, TPM_CRB_CTRL_REQ_GO_IDLE); 398 399 tpmcrb_relinquish_locality(sc); 400 sc->pending_data_length = bytes_available; 401 sc->total_length = bytes_available; 402 403 return (0); 404 } 405 406 /* ACPI Driver */ 407 static device_method_t tpmcrb_methods[] = { 408 DEVMETHOD(device_probe, tpmcrb_acpi_probe), 409 DEVMETHOD(device_attach, tpmcrb_attach), 410 DEVMETHOD(device_detach, tpmcrb_detach), 411 DEVMETHOD(device_shutdown, tpm20_shutdown), 412 DEVMETHOD(device_suspend, tpm20_suspend), 413 DEVMETHOD(tpm_transmit, tpmcrb_transmit), 414 {0, 0} 415 }; 416 417 DEFINE_CLASS_1(tpmcrb, tpmcrb_driver, tpmcrb_methods, sizeof(struct tpmcrb_sc), 418 tpm_bus_driver); 419 420 DRIVER_MODULE(tpmcrb, acpi, tpmcrb_driver, 0, 0); 421