| 1 | /* $NetBSD: tpm.c,v 1.11 2014/07/25 08:10:37 dholland Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2008, 2009 Michael Shalayeff |
| 4 | * Copyright (c) 2009, 2010 Hans-Jörg Höxer |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 15 | * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN |
| 16 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 17 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | */ |
| 19 | |
| 20 | #include <sys/cdefs.h> |
| 21 | __KERNEL_RCSID(0, "$NetBSD: tpm.c,v 1.11 2014/07/25 08:10:37 dholland Exp $" ); |
| 22 | |
| 23 | #if 0 |
| 24 | #define TPM_DEBUG |
| 25 | #define aprint_debug_dev aprint_error_dev |
| 26 | #endif |
| 27 | |
| 28 | #include <sys/param.h> |
| 29 | #include <sys/systm.h> |
| 30 | #include <sys/kernel.h> |
| 31 | #include <sys/malloc.h> |
| 32 | #include <sys/proc.h> |
| 33 | #include <sys/device.h> |
| 34 | #include <sys/conf.h> |
| 35 | #include <sys/bus.h> |
| 36 | #include <sys/pmf.h> |
| 37 | |
| 38 | #include <dev/ic/tpmreg.h> |
| 39 | #include <dev/ic/tpmvar.h> |
| 40 | |
| 41 | /* Set when enabling legacy interface in host bridge. */ |
| 42 | int tpm_enabled; |
| 43 | |
| 44 | const struct { |
| 45 | uint32_t devid; |
| 46 | char name[32]; |
| 47 | int flags; |
| 48 | #define TPM_DEV_NOINTS 0x0001 |
| 49 | } tpm_devs[] = { |
| 50 | { 0x000615d1, "IFX SLD 9630 TT 1.1" , 0 }, |
| 51 | { 0x000b15d1, "IFX SLB 9635 TT 1.2" , 0 }, |
| 52 | { 0x100214e4, "Broadcom BCM0102" , TPM_DEV_NOINTS }, |
| 53 | { 0x00fe1050, "WEC WPCT200" , 0 }, |
| 54 | { 0x687119fa, "SNS SSX35" , 0 }, |
| 55 | { 0x2e4d5453, "STM ST19WP18" , 0 }, |
| 56 | { 0x32021114, "ATML 97SC3203" , TPM_DEV_NOINTS }, |
| 57 | { 0x10408086, "INTEL INTC0102" , 0 }, |
| 58 | { 0, "" , TPM_DEV_NOINTS }, |
| 59 | }; |
| 60 | |
| 61 | int tpm_tis12_irqinit(struct tpm_softc *, int, int); |
| 62 | |
| 63 | int tpm_waitfor_poll(struct tpm_softc *, uint8_t, int, void *); |
| 64 | int tpm_waitfor_int(struct tpm_softc *, uint8_t, int, void *, int); |
| 65 | int tpm_waitfor(struct tpm_softc *, uint8_t, int, void *); |
| 66 | int tpm_request_locality(struct tpm_softc *, int); |
| 67 | int tpm_getburst(struct tpm_softc *); |
| 68 | uint8_t tpm_status(struct tpm_softc *); |
| 69 | int tpm_tmotohz(int); |
| 70 | |
| 71 | static dev_type_open(tpmopen); |
| 72 | static dev_type_close(tpmclose); |
| 73 | static dev_type_read(tpmread); |
| 74 | static dev_type_read(tpmwrite); |
| 75 | static dev_type_ioctl(tpmioctl); |
| 76 | |
| 77 | extern struct cfdriver tpm_cd; |
| 78 | #define TPMUNIT(a) minor(a) |
| 79 | |
| 80 | const struct cdevsw tpm_cdevsw = { |
| 81 | .d_open = tpmopen, |
| 82 | .d_close = tpmclose, |
| 83 | .d_read = tpmread, |
| 84 | .d_write = tpmwrite, |
| 85 | .d_ioctl = tpmioctl, |
| 86 | .d_stop = nostop, |
| 87 | .d_tty = notty, |
| 88 | .d_poll = nopoll, |
| 89 | .d_mmap = nommap, |
| 90 | .d_kqfilter = nokqfilter, |
| 91 | .d_discard = nodiscard, |
| 92 | .d_flag = D_OTHER, |
| 93 | }; |
| 94 | |
| 95 | /* Probe TPM using TIS 1.2 interface. */ |
| 96 | int |
| 97 | tpm_tis12_probe(bus_space_tag_t bt, bus_space_handle_t bh) |
| 98 | { |
| 99 | uint32_t r; |
| 100 | uint8_t save, reg; |
| 101 | |
| 102 | r = bus_space_read_4(bt, bh, TPM_INTF_CAPABILITIES); |
| 103 | if (r == 0xffffffff) |
| 104 | return 0; |
| 105 | |
| 106 | #ifdef TPM_DEBUG |
| 107 | char buf[128]; |
| 108 | snprintb(buf, sizeof(buf), TPM_CAPBITS, r); |
| 109 | printf("%s: caps=%s\n" , __func__, buf); |
| 110 | #endif |
| 111 | if ((r & TPM_CAPSREQ) != TPM_CAPSREQ || |
| 112 | !(r & (TPM_INTF_INT_EDGE_RISING | TPM_INTF_INT_LEVEL_LOW))) { |
| 113 | #ifdef TPM_DEBUG |
| 114 | printf("%s: caps too low (caps=%s)\n" , __func__, buf); |
| 115 | #endif |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | save = bus_space_read_1(bt, bh, TPM_ACCESS); |
| 120 | bus_space_write_1(bt, bh, TPM_ACCESS, TPM_ACCESS_REQUEST_USE); |
| 121 | reg = bus_space_read_1(bt, bh, TPM_ACCESS); |
| 122 | if ((reg & TPM_ACCESS_VALID) && (reg & TPM_ACCESS_ACTIVE_LOCALITY) && |
| 123 | bus_space_read_4(bt, bh, TPM_ID) != 0xffffffff) |
| 124 | return 1; |
| 125 | |
| 126 | bus_space_write_1(bt, bh, TPM_ACCESS, save); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Setup interrupt vector if one is provided and interrupts are know to |
| 132 | * work on that particular chip. |
| 133 | */ |
| 134 | int |
| 135 | tpm_tis12_irqinit(struct tpm_softc *sc, int irq, int idx) |
| 136 | { |
| 137 | uint32_t r; |
| 138 | |
| 139 | if ((irq == -1) || (tpm_devs[idx].flags & TPM_DEV_NOINTS)) { |
| 140 | sc->sc_vector = -1; |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | /* Ack and disable all interrupts. */ |
| 145 | r = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE); |
| 146 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, |
| 147 | r & ~TPM_GLOBAL_INT_ENABLE); |
| 148 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS, |
| 149 | bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS)); |
| 150 | #ifdef TPM_DEBUG |
| 151 | char buf[128]; |
| 152 | snprintb(buf, sizeof(buf), TPM_INTERRUPT_ENABLE_BITS, r); |
| 153 | aprint_debug_dev(sc->sc_dev, "%s: before ien %s\n" , __func__, buf); |
| 154 | #endif |
| 155 | |
| 156 | /* Program interrupt vector. */ |
| 157 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_INT_VECTOR, irq); |
| 158 | sc->sc_vector = irq; |
| 159 | |
| 160 | /* Program interrupt type. */ |
| 161 | r &= ~(TPM_INT_EDGE_RISING|TPM_INT_EDGE_FALLING|TPM_INT_LEVEL_HIGH| |
| 162 | TPM_INT_LEVEL_LOW); |
| 163 | r |= TPM_GLOBAL_INT_ENABLE|TPM_CMD_READY_INT|TPM_LOCALITY_CHANGE_INT| |
| 164 | TPM_STS_VALID_INT|TPM_DATA_AVAIL_INT; |
| 165 | if (sc->sc_capabilities & TPM_INTF_INT_EDGE_RISING) |
| 166 | r |= TPM_INT_EDGE_RISING; |
| 167 | else if (sc->sc_capabilities & TPM_INTF_INT_EDGE_FALLING) |
| 168 | r |= TPM_INT_EDGE_FALLING; |
| 169 | else if (sc->sc_capabilities & TPM_INTF_INT_LEVEL_HIGH) |
| 170 | r |= TPM_INT_LEVEL_HIGH; |
| 171 | else |
| 172 | r |= TPM_INT_LEVEL_LOW; |
| 173 | |
| 174 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, r); |
| 175 | #ifdef TPM_DEBUG |
| 176 | snprintb(buf, sizeof(buf), TPM_INTERRUPT_ENABLE_BITS, r); |
| 177 | aprint_debug_dev(sc->sc_dev, "%s: after ien %s\n" , __func__, buf); |
| 178 | #endif |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | /* Setup TPM using TIS 1.2 interface. */ |
| 184 | int |
| 185 | tpm_tis12_init(struct tpm_softc *sc, int irq, const char *name) |
| 186 | { |
| 187 | uint32_t r; |
| 188 | int i; |
| 189 | |
| 190 | r = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTF_CAPABILITIES); |
| 191 | #ifdef TPM_DEBUG |
| 192 | char cbuf[128]; |
| 193 | snprintb(cbuf, sizeof(cbuf), TPM_CAPBITS, r); |
| 194 | aprint_debug_dev(sc->sc_dev, "%s: caps=%s " , __func__, cbuf); |
| 195 | #endif |
| 196 | if ((r & TPM_CAPSREQ) != TPM_CAPSREQ || |
| 197 | !(r & (TPM_INTF_INT_EDGE_RISING | TPM_INTF_INT_LEVEL_LOW))) { |
| 198 | char buf[128]; |
| 199 | snprintb(buf, sizeof(buf), TPM_CAPBITS, r); |
| 200 | aprint_error_dev(sc->sc_dev, "capabilities too low (caps=%s)\n" , |
| 201 | buf); |
| 202 | return 1; |
| 203 | } |
| 204 | sc->sc_capabilities = r; |
| 205 | |
| 206 | sc->sc_devid = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_ID); |
| 207 | sc->sc_rev = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_REV); |
| 208 | |
| 209 | for (i = 0; tpm_devs[i].devid; i++) |
| 210 | if (tpm_devs[i].devid == sc->sc_devid) |
| 211 | break; |
| 212 | |
| 213 | if (tpm_devs[i].devid) |
| 214 | aprint_normal(": %s rev 0x%x\n" , |
| 215 | tpm_devs[i].name, sc->sc_rev); |
| 216 | else |
| 217 | aprint_normal(": device 0x%08x rev 0x%x\n" , |
| 218 | sc->sc_devid, sc->sc_rev); |
| 219 | |
| 220 | if (tpm_tis12_irqinit(sc, irq, i)) |
| 221 | return 1; |
| 222 | |
| 223 | if (tpm_request_locality(sc, 0)) |
| 224 | return 1; |
| 225 | |
| 226 | /* Abort whatever it thought it was doing. */ |
| 227 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_CMD_READY); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | int |
| 233 | tpm_request_locality(struct tpm_softc *sc, int l) |
| 234 | { |
| 235 | uint32_t r; |
| 236 | int to, rv; |
| 237 | |
| 238 | if (l != 0) |
| 239 | return EINVAL; |
| 240 | |
| 241 | if ((bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS) & |
| 242 | (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) == |
| 243 | (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) |
| 244 | return 0; |
| 245 | |
| 246 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS, |
| 247 | TPM_ACCESS_REQUEST_USE); |
| 248 | |
| 249 | to = tpm_tmotohz(TPM_ACCESS_TMO); |
| 250 | |
| 251 | while ((r = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS) & |
| 252 | (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) != |
| 253 | (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY) && to--) { |
| 254 | rv = tsleep(sc->sc_init, PRIBIO | PCATCH, "tpm_locality" , 1); |
| 255 | if (rv && rv != EWOULDBLOCK) { |
| 256 | #ifdef TPM_DEBUG |
| 257 | aprint_debug_dev(sc->sc_dev, "%s: interrupted %d\n" , |
| 258 | __func__, rv); |
| 259 | #endif |
| 260 | return rv; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | if ((r & (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) != |
| 265 | (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) { |
| 266 | #ifdef TPM_DEBUG |
| 267 | char buf[128]; |
| 268 | snprintb(buf, sizeof(buf), TPM_ACCESS_BITS, r); |
| 269 | aprint_debug_dev(sc->sc_dev, "%s: access %s\n" , __func__, buf); |
| 270 | #endif |
| 271 | return EBUSY; |
| 272 | } |
| 273 | |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | int |
| 278 | tpm_getburst(struct tpm_softc *sc) |
| 279 | { |
| 280 | int burst, to, rv; |
| 281 | |
| 282 | to = tpm_tmotohz(TPM_BURST_TMO); |
| 283 | |
| 284 | burst = 0; |
| 285 | while (burst == 0 && to--) { |
| 286 | /* |
| 287 | * Burst count has to be read from bits 8 to 23 without |
| 288 | * touching any other bits, eg. the actual status bits 0 |
| 289 | * to 7. |
| 290 | */ |
| 291 | burst = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS + 1); |
| 292 | burst |= bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS + 2) |
| 293 | << 8; |
| 294 | #ifdef TPM_DEBUG |
| 295 | aprint_debug_dev(sc->sc_dev, "%s: read %d\n" , __func__, burst); |
| 296 | #endif |
| 297 | if (burst) |
| 298 | return burst; |
| 299 | |
| 300 | rv = tsleep(sc, PRIBIO | PCATCH, "tpm_getburst" , 1); |
| 301 | if (rv && rv != EWOULDBLOCK) { |
| 302 | return 0; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | uint8_t |
| 310 | tpm_status(struct tpm_softc *sc) |
| 311 | { |
| 312 | return bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS) & TPM_STS_MASK; |
| 313 | } |
| 314 | |
| 315 | int |
| 316 | tpm_tmotohz(int tmo) |
| 317 | { |
| 318 | struct timeval tv; |
| 319 | |
| 320 | tv.tv_sec = tmo / 1000; |
| 321 | tv.tv_usec = 1000 * (tmo % 1000); |
| 322 | |
| 323 | return tvtohz(&tv); |
| 324 | } |
| 325 | |
| 326 | /* Save TPM state on suspend. */ |
| 327 | bool |
| 328 | tpm_suspend(device_t dev, const pmf_qual_t *qual) |
| 329 | { |
| 330 | struct tpm_softc *sc = device_private(dev); |
| 331 | static const uint8_t command[] = { |
| 332 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
| 333 | 0, 0, 0, 10, /* Length in bytes */ |
| 334 | 0, 0, 0, 156 /* TPM_ORD_SaveStates */ |
| 335 | }; |
| 336 | uint8_t scratch[sizeof(command)]; |
| 337 | |
| 338 | /* |
| 339 | * Power down: We have to issue the SaveStates command. |
| 340 | */ |
| 341 | (*sc->sc_write)(sc, &command, sizeof(command)); |
| 342 | (*sc->sc_read)(sc, &scratch, sizeof(scratch), NULL, TPM_HDRSIZE); |
| 343 | #ifdef TPM_DEBUG |
| 344 | aprint_debug_dev(sc->sc_dev, "%s: power down\n" , __func__); |
| 345 | #endif |
| 346 | return true; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Handle resume event. Actually nothing to do as the BIOS is supposed |
| 351 | * to restore the previously saved state. |
| 352 | */ |
| 353 | bool |
| 354 | tpm_resume(device_t dev, const pmf_qual_t *qual) |
| 355 | { |
| 356 | #ifdef TPM_DEBUG |
| 357 | struct tpm_softc *sc = device_private(dev); |
| 358 | aprint_debug_dev(sc->sc_dev, "%s: resume\n" , __func__); |
| 359 | #endif |
| 360 | return true; |
| 361 | } |
| 362 | |
| 363 | /* Wait for given status bits using polling. */ |
| 364 | int |
| 365 | tpm_waitfor_poll(struct tpm_softc *sc, uint8_t mask, int tmo, void *c) |
| 366 | { |
| 367 | int rv; |
| 368 | |
| 369 | /* |
| 370 | * Poll until either the requested condition or a time out is |
| 371 | * met. |
| 372 | */ |
| 373 | while (((sc->sc_stat = tpm_status(sc)) & mask) != mask && tmo--) { |
| 374 | rv = tsleep(c, PRIBIO | PCATCH, "tpm_poll" , 1); |
| 375 | if (rv && rv != EWOULDBLOCK) { |
| 376 | #ifdef TPM_DEBUG |
| 377 | aprint_debug_dev(sc->sc_dev, |
| 378 | "%s: interrupted %d\n" , __func__, rv); |
| 379 | #endif |
| 380 | return rv; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* Wait for given status bits using interrupts. */ |
| 388 | int |
| 389 | tpm_waitfor_int(struct tpm_softc *sc, uint8_t mask, int tmo, void *c, |
| 390 | int inttype) |
| 391 | { |
| 392 | int rv, to; |
| 393 | |
| 394 | /* Poll and return when condition is already met. */ |
| 395 | sc->sc_stat = tpm_status(sc); |
| 396 | if ((sc->sc_stat & mask) == mask) |
| 397 | return 0; |
| 398 | |
| 399 | /* |
| 400 | * Enable interrupt on tpm chip. Note that interrupts on our |
| 401 | * level (SPL_TTY) are disabled (see tpm{read,write} et al) and |
| 402 | * will not be delivered to the cpu until we call tsleep(9) below. |
| 403 | */ |
| 404 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, |
| 405 | bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) | |
| 406 | inttype); |
| 407 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, |
| 408 | bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) | |
| 409 | TPM_GLOBAL_INT_ENABLE); |
| 410 | |
| 411 | /* |
| 412 | * Poll once more to remedy the race between previous polling |
| 413 | * and enabling interrupts on the tpm chip. |
| 414 | */ |
| 415 | sc->sc_stat = tpm_status(sc); |
| 416 | if ((sc->sc_stat & mask) == mask) { |
| 417 | rv = 0; |
| 418 | goto out; |
| 419 | } |
| 420 | |
| 421 | to = tpm_tmotohz(tmo); |
| 422 | #ifdef TPM_DEBUG |
| 423 | aprint_debug_dev(sc->sc_dev, |
| 424 | "%s: sleeping for %d ticks on %p\n" , __func__, to, c); |
| 425 | #endif |
| 426 | /* |
| 427 | * tsleep(9) enables interrupts on the cpu and returns after |
| 428 | * wake up with interrupts disabled again. Note that interrupts |
| 429 | * generated by the tpm chip while being at SPL_TTY are not lost |
| 430 | * but held and delivered as soon as the cpu goes below SPL_TTY. |
| 431 | */ |
| 432 | rv = tsleep(c, PRIBIO | PCATCH, "tpm_wait" , to); |
| 433 | |
| 434 | sc->sc_stat = tpm_status(sc); |
| 435 | #ifdef TPM_DEBUG |
| 436 | char buf[128]; |
| 437 | snprintb(buf, sizeof(buf), TPM_STS_BITS, sc->sc_stat); |
| 438 | aprint_debug_dev(sc->sc_dev, |
| 439 | "%s: woke up with rv %d stat %s\n" , __func__, rv, buf); |
| 440 | #endif |
| 441 | if ((sc->sc_stat & mask) == mask) |
| 442 | rv = 0; |
| 443 | |
| 444 | /* Disable interrupts on tpm chip again. */ |
| 445 | out: bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, |
| 446 | bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) & |
| 447 | ~TPM_GLOBAL_INT_ENABLE); |
| 448 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, |
| 449 | bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) & |
| 450 | ~inttype); |
| 451 | |
| 452 | return rv; |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Wait on given status bits, uses interrupts where possible, otherwise polls. |
| 457 | */ |
| 458 | int |
| 459 | tpm_waitfor(struct tpm_softc *sc, uint8_t b0, int tmo, void *c) |
| 460 | { |
| 461 | uint8_t b; |
| 462 | int re, to, rv; |
| 463 | |
| 464 | #ifdef TPM_DEBUG |
| 465 | char buf[128]; |
| 466 | snprintb(buf, sizeof(buf), TPM_STS_BITS, sc->sc_stat); |
| 467 | aprint_debug_dev(sc->sc_dev, "%s: b0 %s\n" , __func__, buf); |
| 468 | #endif |
| 469 | |
| 470 | /* |
| 471 | * If possible, use interrupts, otherwise poll. |
| 472 | * |
| 473 | * We use interrupts for TPM_STS_VALID and TPM_STS_DATA_AVAIL (if |
| 474 | * the tpm chips supports them) as waiting for those can take |
| 475 | * really long. The other TPM_STS* are not needed very often |
| 476 | * so we do not support them. |
| 477 | */ |
| 478 | if (sc->sc_vector != -1) { |
| 479 | b = b0; |
| 480 | |
| 481 | /* |
| 482 | * Wait for data ready. This interrupt only occures |
| 483 | * when both TPM_STS_VALID and TPM_STS_DATA_AVAIL are asserted. |
| 484 | * Thus we don't have to bother with TPM_STS_VALID |
| 485 | * separately and can just return. |
| 486 | * |
| 487 | * This only holds for interrupts! When using polling |
| 488 | * both flags have to be waited for, see below. |
| 489 | */ |
| 490 | if ((b & TPM_STS_DATA_AVAIL) && (sc->sc_capabilities & |
| 491 | TPM_INTF_DATA_AVAIL_INT)) |
| 492 | return tpm_waitfor_int(sc, b, tmo, c, |
| 493 | TPM_DATA_AVAIL_INT); |
| 494 | |
| 495 | /* Wait for status valid bit. */ |
| 496 | if ((b & TPM_STS_VALID) && (sc->sc_capabilities & |
| 497 | TPM_INTF_STS_VALID_INT)) { |
| 498 | rv = tpm_waitfor_int(sc, b, tmo, c, TPM_STS_VALID_INT); |
| 499 | if (rv != 0) |
| 500 | return rv; |
| 501 | else |
| 502 | b = b0 & ~TPM_STS_VALID; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * When all flags are taken care of, return. Otherwise |
| 507 | * use polling for eg. TPM_STS_CMD_READY. |
| 508 | */ |
| 509 | if (b == 0) |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | re = 3; |
| 514 | restart: |
| 515 | /* |
| 516 | * If requested wait for TPM_STS_VALID before dealing with |
| 517 | * any other flag. Eg. when both TPM_STS_DATA_AVAIL and TPM_STS_VALID |
| 518 | * are requested, wait for the latter first. |
| 519 | */ |
| 520 | b = b0; |
| 521 | if (b0 & TPM_STS_VALID) |
| 522 | b = TPM_STS_VALID; |
| 523 | |
| 524 | to = tpm_tmotohz(tmo); |
| 525 | again: |
| 526 | if ((rv = tpm_waitfor_poll(sc, b, to, c)) != 0) |
| 527 | return rv; |
| 528 | |
| 529 | if ((b & sc->sc_stat) == TPM_STS_VALID) { |
| 530 | /* Now wait for other flags. */ |
| 531 | b = b0 & ~TPM_STS_VALID; |
| 532 | to++; |
| 533 | goto again; |
| 534 | } |
| 535 | |
| 536 | if ((sc->sc_stat & b) != b) { |
| 537 | #ifdef TPM_DEBUG |
| 538 | char bbuf[128], cbuf[128]; |
| 539 | snprintb(bbuf, sizeof(bbuf), TPM_STS_BITS, b); |
| 540 | snprintb(cbuf, sizeof(cbuf), TPM_STS_BITS, sc->sc_stat); |
| 541 | aprint_debug_dev(sc->sc_dev, |
| 542 | "%s: timeout: stat=%s b=%s\n" , __func__, cbuf, bbuf); |
| 543 | #endif |
| 544 | if (re-- && (b0 & TPM_STS_VALID)) { |
| 545 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, |
| 546 | TPM_STS_RESP_RETRY); |
| 547 | goto restart; |
| 548 | } |
| 549 | return EIO; |
| 550 | } |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | /* Start transaction. */ |
| 556 | int |
| 557 | tpm_tis12_start(struct tpm_softc *sc, int flag) |
| 558 | { |
| 559 | int rv; |
| 560 | |
| 561 | if (flag == UIO_READ) { |
| 562 | rv = tpm_waitfor(sc, TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
| 563 | TPM_READ_TMO, sc->sc_read); |
| 564 | return rv; |
| 565 | } |
| 566 | |
| 567 | /* Own our (0th) locality. */ |
| 568 | if ((rv = tpm_request_locality(sc, 0)) != 0) |
| 569 | return rv; |
| 570 | |
| 571 | sc->sc_stat = tpm_status(sc); |
| 572 | if (sc->sc_stat & TPM_STS_CMD_READY) { |
| 573 | #ifdef TPM_DEBUG |
| 574 | char buf[128]; |
| 575 | snprintb(buf, sizeof(buf), TPM_STS_BITS, sc->sc_stat); |
| 576 | aprint_debug_dev(sc->sc_dev, "%s: UIO_WRITE status %s\n" , |
| 577 | __func__, buf); |
| 578 | #endif |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | #ifdef TPM_DEBUG |
| 583 | aprint_debug_dev(sc->sc_dev, |
| 584 | "%s: UIO_WRITE readying chip\n" , __func__); |
| 585 | #endif |
| 586 | |
| 587 | /* Abort previous and restart. */ |
| 588 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_CMD_READY); |
| 589 | if ((rv = tpm_waitfor(sc, TPM_STS_CMD_READY, TPM_READY_TMO, |
| 590 | sc->sc_write))) { |
| 591 | #ifdef TPM_DEBUG |
| 592 | aprint_debug_dev(sc->sc_dev, |
| 593 | "%s: UIO_WRITE readying failed %d\n" , __func__, rv); |
| 594 | #endif |
| 595 | return rv; |
| 596 | } |
| 597 | |
| 598 | #ifdef TPM_DEBUG |
| 599 | aprint_debug_dev(sc->sc_dev, |
| 600 | "%s: UIO_WRITE readying done\n" , __func__); |
| 601 | #endif |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | int |
| 607 | tpm_tis12_read(struct tpm_softc *sc, void *buf, size_t len, size_t *count, |
| 608 | int flags) |
| 609 | { |
| 610 | uint8_t *p = buf; |
| 611 | size_t cnt; |
| 612 | int rv, n, bcnt; |
| 613 | |
| 614 | #ifdef TPM_DEBUG |
| 615 | aprint_debug_dev(sc->sc_dev, "%s: len %zu\n" , __func__, len); |
| 616 | #endif |
| 617 | cnt = 0; |
| 618 | while (len > 0) { |
| 619 | if ((rv = tpm_waitfor(sc, TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
| 620 | TPM_READ_TMO, sc->sc_read))) |
| 621 | return rv; |
| 622 | |
| 623 | bcnt = tpm_getburst(sc); |
| 624 | n = MIN(len, bcnt); |
| 625 | #ifdef TPM_DEBUG |
| 626 | aprint_debug_dev(sc->sc_dev, |
| 627 | "%s: fetching %d, burst is %d\n" , __func__, n, bcnt); |
| 628 | #endif |
| 629 | for (; n--; len--) { |
| 630 | *p++ = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_DATA); |
| 631 | cnt++; |
| 632 | } |
| 633 | |
| 634 | if ((flags & TPM_PARAM_SIZE) == 0 && cnt >= 6) |
| 635 | break; |
| 636 | } |
| 637 | #ifdef TPM_DEBUG |
| 638 | aprint_debug_dev(sc->sc_dev, |
| 639 | "%s: read %zu bytes, len %zu\n" , __func__, cnt, len); |
| 640 | #endif |
| 641 | |
| 642 | if (count) |
| 643 | *count = cnt; |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | int |
| 649 | tpm_tis12_write(struct tpm_softc *sc, const void *buf, size_t len) |
| 650 | { |
| 651 | const uint8_t *p = buf; |
| 652 | size_t cnt; |
| 653 | int rv, r; |
| 654 | |
| 655 | #ifdef TPM_DEBUG |
| 656 | aprint_debug_dev(sc->sc_dev, |
| 657 | "%s: sc %p buf %p len %zu\n" , __func__, sc, buf, len); |
| 658 | #endif |
| 659 | if (len == 0) |
| 660 | return 0; |
| 661 | |
| 662 | if ((rv = tpm_request_locality(sc, 0)) != 0) |
| 663 | return rv; |
| 664 | |
| 665 | cnt = 0; |
| 666 | while (cnt < len - 1) { |
| 667 | for (r = tpm_getburst(sc); r > 0 && cnt < len - 1; r--) { |
| 668 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_DATA, *p++); |
| 669 | cnt++; |
| 670 | } |
| 671 | if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, sc))) { |
| 672 | #ifdef TPM_DEBUG |
| 673 | aprint_debug_dev(sc->sc_dev, |
| 674 | "%s: failed burst rv %d\n" , __func__, rv); |
| 675 | #endif |
| 676 | return rv; |
| 677 | } |
| 678 | sc->sc_stat = tpm_status(sc); |
| 679 | if (!(sc->sc_stat & TPM_STS_DATA_EXPECT)) { |
| 680 | #ifdef TPM_DEBUG |
| 681 | char sbuf[128]; |
| 682 | snprintb(sbuf, sizeof(sbuf), TPM_STS_BITS, sc->sc_stat); |
| 683 | aprint_debug_dev(sc->sc_dev, |
| 684 | "%s: failed rv %d stat=%s\n" , __func__, rv, sbuf); |
| 685 | #endif |
| 686 | return EIO; |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_DATA, *p++); |
| 691 | cnt++; |
| 692 | |
| 693 | if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, sc))) { |
| 694 | #ifdef TPM_DEBUG |
| 695 | aprint_debug_dev(sc->sc_dev, "%s: failed last byte rv %d\n" , |
| 696 | __func__, rv); |
| 697 | #endif |
| 698 | return rv; |
| 699 | } |
| 700 | if ((sc->sc_stat & TPM_STS_DATA_EXPECT) != 0) { |
| 701 | #ifdef TPM_DEBUG |
| 702 | char sbuf[128]; |
| 703 | snprintb(sbuf, sizeof(sbuf), TPM_STS_BITS, sc->sc_stat); |
| 704 | aprint_debug_dev(sc->sc_dev, |
| 705 | "%s: failed rv %d stat=%s\n" , __func__, rv, sbuf); |
| 706 | #endif |
| 707 | return EIO; |
| 708 | } |
| 709 | |
| 710 | #ifdef TPM_DEBUG |
| 711 | aprint_debug_dev(sc->sc_dev, "%s: wrote %zu byte\n" , __func__, cnt); |
| 712 | #endif |
| 713 | |
| 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | /* Finish transaction. */ |
| 718 | int |
| 719 | tpm_tis12_end(struct tpm_softc *sc, int flag, int err) |
| 720 | { |
| 721 | int rv = 0; |
| 722 | |
| 723 | if (flag == UIO_READ) { |
| 724 | if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, |
| 725 | sc->sc_read))) |
| 726 | return rv; |
| 727 | |
| 728 | /* Still more data? */ |
| 729 | sc->sc_stat = tpm_status(sc); |
| 730 | if (!err && ((sc->sc_stat & TPM_STS_DATA_AVAIL) |
| 731 | == TPM_STS_DATA_AVAIL)) { |
| 732 | #ifdef TPM_DEBUG |
| 733 | char buf[128]; |
| 734 | snprintb(buf, sizeof(buf), TPM_STS_BITS, sc->sc_stat); |
| 735 | aprint_debug_dev(sc->sc_dev, |
| 736 | "%s: read failed stat=%s\n" , __func__, buf); |
| 737 | #endif |
| 738 | rv = EIO; |
| 739 | } |
| 740 | |
| 741 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, |
| 742 | TPM_STS_CMD_READY); |
| 743 | |
| 744 | /* Release our (0th) locality. */ |
| 745 | bus_space_write_1(sc->sc_bt, sc->sc_bh,TPM_ACCESS, |
| 746 | TPM_ACCESS_ACTIVE_LOCALITY); |
| 747 | } else { |
| 748 | /* Hungry for more? */ |
| 749 | sc->sc_stat = tpm_status(sc); |
| 750 | if (!err && (sc->sc_stat & TPM_STS_DATA_EXPECT)) { |
| 751 | #ifdef TPM_DEBUG |
| 752 | char buf[128]; |
| 753 | snprintb(buf, sizeof(buf), TPM_STS_BITS, sc->sc_stat); |
| 754 | aprint_debug_dev(sc->sc_dev, |
| 755 | "%s: write failed stat=%s\n" , __func__, buf); |
| 756 | #endif |
| 757 | rv = EIO; |
| 758 | } |
| 759 | |
| 760 | bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, |
| 761 | err ? TPM_STS_CMD_READY : TPM_STS_GO); |
| 762 | } |
| 763 | |
| 764 | return rv; |
| 765 | } |
| 766 | |
| 767 | int |
| 768 | tpm_intr(void *v) |
| 769 | { |
| 770 | struct tpm_softc *sc = v; |
| 771 | uint32_t r; |
| 772 | #ifdef TPM_DEBUG |
| 773 | static int cnt = 0; |
| 774 | #endif |
| 775 | |
| 776 | r = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS); |
| 777 | #ifdef TPM_DEBUG |
| 778 | if (r != 0) { |
| 779 | char buf[128]; |
| 780 | snprintb(buf, sizeof(buf), TPM_INTERRUPT_ENABLE_BITS, r); |
| 781 | aprint_debug_dev(sc->sc_dev, "%s: int=%s (%d)\n" , __func__, |
| 782 | buf, cnt); |
| 783 | } else |
| 784 | cnt++; |
| 785 | #endif |
| 786 | if (!(r & (TPM_CMD_READY_INT | TPM_LOCALITY_CHANGE_INT | |
| 787 | TPM_STS_VALID_INT | TPM_DATA_AVAIL_INT))) |
| 788 | #ifdef __FreeBSD__ |
| 789 | return; |
| 790 | #else |
| 791 | return 0; |
| 792 | #endif |
| 793 | if (r & TPM_STS_VALID_INT) |
| 794 | wakeup(sc); |
| 795 | |
| 796 | if (r & TPM_CMD_READY_INT) |
| 797 | wakeup(sc->sc_write); |
| 798 | |
| 799 | if (r & TPM_DATA_AVAIL_INT) |
| 800 | wakeup(sc->sc_read); |
| 801 | |
| 802 | if (r & TPM_LOCALITY_CHANGE_INT) |
| 803 | wakeup(sc->sc_init); |
| 804 | |
| 805 | bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS, r); |
| 806 | |
| 807 | return 1; |
| 808 | } |
| 809 | |
| 810 | /* Read single byte using legacy interface. */ |
| 811 | static inline uint8_t |
| 812 | tpm_legacy_in(bus_space_tag_t iot, bus_space_handle_t ioh, int reg) |
| 813 | { |
| 814 | bus_space_write_1(iot, ioh, 0, reg); |
| 815 | return bus_space_read_1(iot, ioh, 1); |
| 816 | } |
| 817 | |
| 818 | /* Probe for TPM using legacy interface. */ |
| 819 | int |
| 820 | tpm_legacy_probe(bus_space_tag_t iot, bus_addr_t iobase) |
| 821 | { |
| 822 | bus_space_handle_t ioh; |
| 823 | uint8_t r, v; |
| 824 | int i, rv = 0; |
| 825 | char id[8]; |
| 826 | |
| 827 | if (!tpm_enabled || iobase == -1) |
| 828 | return 0; |
| 829 | |
| 830 | if (bus_space_map(iot, iobase, 2, 0, &ioh)) |
| 831 | return 0; |
| 832 | |
| 833 | v = bus_space_read_1(iot, ioh, 0); |
| 834 | if (v == 0xff) { |
| 835 | bus_space_unmap(iot, ioh, 2); |
| 836 | return 0; |
| 837 | } |
| 838 | r = bus_space_read_1(iot, ioh, 1); |
| 839 | |
| 840 | for (i = sizeof(id); i--; ) |
| 841 | id[i] = tpm_legacy_in(iot, ioh, TPM_ID + i); |
| 842 | |
| 843 | #ifdef TPM_DEBUG |
| 844 | printf("tpm_legacy_probe %.4s %d.%d.%d.%d\n" , |
| 845 | &id[4], id[0], id[1], id[2], id[3]); |
| 846 | #endif |
| 847 | /* |
| 848 | * The only chips using the legacy interface we are aware of are |
| 849 | * by Atmel. For other chips more signature would have to be added. |
| 850 | */ |
| 851 | if (!bcmp(&id[4], "ATML" , 4)) |
| 852 | rv = 1; |
| 853 | |
| 854 | if (!rv) { |
| 855 | bus_space_write_1(iot, ioh, r, 1); |
| 856 | bus_space_write_1(iot, ioh, v, 0); |
| 857 | } |
| 858 | bus_space_unmap(iot, ioh, 2); |
| 859 | |
| 860 | return rv; |
| 861 | } |
| 862 | |
| 863 | /* Setup TPM using legacy interface. */ |
| 864 | int |
| 865 | tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name) |
| 866 | { |
| 867 | char id[8]; |
| 868 | int i; |
| 869 | |
| 870 | if ((i = bus_space_map(sc->sc_batm, tpm_enabled, 2, 0, &sc->sc_bahm))) { |
| 871 | aprint_debug_dev(sc->sc_dev, "cannot map tpm registers (%d)\n" , |
| 872 | i); |
| 873 | tpm_enabled = 0; |
| 874 | return 1; |
| 875 | } |
| 876 | |
| 877 | for (i = sizeof(id); i--; ) |
| 878 | id[i] = tpm_legacy_in(sc->sc_bt, sc->sc_bh, TPM_ID + i); |
| 879 | |
| 880 | aprint_debug_dev(sc->sc_dev, "%.4s %d.%d @0x%x\n" , &id[4], id[0], |
| 881 | id[1], tpm_enabled); |
| 882 | tpm_enabled = 0; |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | /* Start transaction. */ |
| 888 | int |
| 889 | tpm_legacy_start(struct tpm_softc *sc, int flag) |
| 890 | { |
| 891 | struct timeval tv; |
| 892 | uint8_t bits, r; |
| 893 | int to, rv; |
| 894 | |
| 895 | bits = flag == UIO_READ ? TPM_LEGACY_DA : 0; |
| 896 | tv.tv_sec = TPM_LEGACY_TMO; |
| 897 | tv.tv_usec = 0; |
| 898 | to = tvtohz(&tv) / TPM_LEGACY_SLEEP; |
| 899 | while (((r = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1)) & |
| 900 | (TPM_LEGACY_BUSY|bits)) != bits && to--) { |
| 901 | rv = tsleep(sc, PRIBIO | PCATCH, "legacy_tpm_start" , |
| 902 | TPM_LEGACY_SLEEP); |
| 903 | if (rv && rv != EWOULDBLOCK) |
| 904 | return rv; |
| 905 | } |
| 906 | |
| 907 | #if defined(TPM_DEBUG) && !defined(__FreeBSD__) |
| 908 | char buf[128]; |
| 909 | snprintb(buf, sizeof(buf), TPM_LEGACY_BITS, r); |
| 910 | aprint_debug_dev(sc->sc_dev, "%s: bits %s\n" , device_xname(sc->sc_dev), |
| 911 | buf); |
| 912 | #endif |
| 913 | if ((r & (TPM_LEGACY_BUSY|bits)) != bits) |
| 914 | return EIO; |
| 915 | |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | int |
| 920 | tpm_legacy_read(struct tpm_softc *sc, void *buf, size_t len, size_t *count, |
| 921 | int flags) |
| 922 | { |
| 923 | uint8_t *p; |
| 924 | size_t cnt; |
| 925 | int to, rv; |
| 926 | |
| 927 | cnt = rv = 0; |
| 928 | for (p = buf; !rv && len > 0; len--) { |
| 929 | for (to = 1000; |
| 930 | !(bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1) & |
| 931 | TPM_LEGACY_DA); DELAY(1)) |
| 932 | if (!to--) |
| 933 | return EIO; |
| 934 | |
| 935 | DELAY(TPM_LEGACY_DELAY); |
| 936 | *p++ = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 0); |
| 937 | cnt++; |
| 938 | } |
| 939 | |
| 940 | *count = cnt; |
| 941 | return 0; |
| 942 | } |
| 943 | |
| 944 | int |
| 945 | tpm_legacy_write(struct tpm_softc *sc, const void *buf, size_t len) |
| 946 | { |
| 947 | const uint8_t *p; |
| 948 | size_t n; |
| 949 | |
| 950 | for (p = buf, n = len; n--; DELAY(TPM_LEGACY_DELAY)) { |
| 951 | if (!n && len != TPM_BUFSIZ) { |
| 952 | bus_space_write_1(sc->sc_batm, sc->sc_bahm, 1, |
| 953 | TPM_LEGACY_LAST); |
| 954 | DELAY(TPM_LEGACY_DELAY); |
| 955 | } |
| 956 | bus_space_write_1(sc->sc_batm, sc->sc_bahm, 0, *p++); |
| 957 | } |
| 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /* Finish transaction. */ |
| 963 | int |
| 964 | tpm_legacy_end(struct tpm_softc *sc, int flag, int rv) |
| 965 | { |
| 966 | struct timeval tv; |
| 967 | uint8_t r; |
| 968 | int to; |
| 969 | |
| 970 | if (rv || flag == UIO_READ) |
| 971 | bus_space_write_1(sc->sc_batm, sc->sc_bahm, 1, TPM_LEGACY_ABRT); |
| 972 | else { |
| 973 | tv.tv_sec = TPM_LEGACY_TMO; |
| 974 | tv.tv_usec = 0; |
| 975 | to = tvtohz(&tv) / TPM_LEGACY_SLEEP; |
| 976 | while(((r = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1)) & |
| 977 | TPM_LEGACY_BUSY) && to--) { |
| 978 | rv = tsleep(sc, PRIBIO | PCATCH, "legacy_tpm_end" , |
| 979 | TPM_LEGACY_SLEEP); |
| 980 | if (rv && rv != EWOULDBLOCK) |
| 981 | return rv; |
| 982 | } |
| 983 | |
| 984 | #if defined(TPM_DEBUG) && !defined(__FreeBSD__) |
| 985 | char buf[128]; |
| 986 | snprintb(buf, sizeof(buf), TPM_LEGACY_BITS, r); |
| 987 | aprint_debug_dev(sc->sc_dev, "%s: bits %s\n" , |
| 988 | device_xname(sc->sc_dev), buf); |
| 989 | #endif |
| 990 | if (r & TPM_LEGACY_BUSY) |
| 991 | return EIO; |
| 992 | |
| 993 | if (r & TPM_LEGACY_RE) |
| 994 | return EIO; /* XXX Retry the loop? */ |
| 995 | } |
| 996 | |
| 997 | return rv; |
| 998 | } |
| 999 | |
| 1000 | int |
| 1001 | tpmopen(dev_t dev, int flag, int mode, struct lwp *l) |
| 1002 | { |
| 1003 | struct tpm_softc *sc = device_lookup_private(&tpm_cd, TPMUNIT(dev)); |
| 1004 | |
| 1005 | if (!sc) |
| 1006 | return ENXIO; |
| 1007 | |
| 1008 | if (sc->sc_flags & TPM_OPEN) |
| 1009 | return EBUSY; |
| 1010 | |
| 1011 | sc->sc_flags |= TPM_OPEN; |
| 1012 | |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
| 1016 | int |
| 1017 | tpmclose(dev_t dev, int flag, int mode, struct lwp *l) |
| 1018 | { |
| 1019 | struct tpm_softc *sc = device_lookup_private(&tpm_cd, TPMUNIT(dev)); |
| 1020 | |
| 1021 | if (!sc) |
| 1022 | return ENXIO; |
| 1023 | |
| 1024 | if (!(sc->sc_flags & TPM_OPEN)) |
| 1025 | return EINVAL; |
| 1026 | |
| 1027 | sc->sc_flags &= ~TPM_OPEN; |
| 1028 | |
| 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | int |
| 1033 | tpmread(dev_t dev, struct uio *uio, int flags) |
| 1034 | { |
| 1035 | struct tpm_softc *sc = device_lookup_private(&tpm_cd, TPMUNIT(dev)); |
| 1036 | uint8_t buf[TPM_BUFSIZ], *p; |
| 1037 | size_t cnt, len, n; |
| 1038 | int rv, s; |
| 1039 | |
| 1040 | if (!sc) |
| 1041 | return ENXIO; |
| 1042 | |
| 1043 | s = spltty(); |
| 1044 | if ((rv = (*sc->sc_start)(sc, UIO_READ))) |
| 1045 | goto out; |
| 1046 | |
| 1047 | #ifdef TPM_DEBUG |
| 1048 | aprint_debug_dev(sc->sc_dev, "%s: getting header\n" , __func__); |
| 1049 | #endif |
| 1050 | if ((rv = (*sc->sc_read)(sc, buf, TPM_HDRSIZE, &cnt, 0))) { |
| 1051 | (*sc->sc_end)(sc, UIO_READ, rv); |
| 1052 | goto out; |
| 1053 | } |
| 1054 | |
| 1055 | len = (buf[2] << 24) | (buf[3] << 16) | (buf[4] << 8) | buf[5]; |
| 1056 | #ifdef TPM_DEBUG |
| 1057 | aprint_debug_dev(sc->sc_dev, "%s: len %zu, io count %zu\n" , __func__, |
| 1058 | len, uio->uio_resid); |
| 1059 | #endif |
| 1060 | if (len > uio->uio_resid) { |
| 1061 | rv = EIO; |
| 1062 | (*sc->sc_end)(sc, UIO_READ, rv); |
| 1063 | #ifdef TPM_DEBUG |
| 1064 | aprint_debug_dev(sc->sc_dev, |
| 1065 | "%s: bad residual io count 0x%zx\n" , __func__, |
| 1066 | uio->uio_resid); |
| 1067 | #endif |
| 1068 | goto out; |
| 1069 | } |
| 1070 | |
| 1071 | /* Copy out header. */ |
| 1072 | if ((rv = uiomove(buf, cnt, uio))) { |
| 1073 | #ifdef TPM_DEBUG |
| 1074 | aprint_debug_dev(sc->sc_dev, |
| 1075 | "%s: uiomove failed %d\n" , __func__, rv); |
| 1076 | #endif |
| 1077 | (*sc->sc_end)(sc, UIO_READ, rv); |
| 1078 | goto out; |
| 1079 | } |
| 1080 | |
| 1081 | /* Get remaining part of the answer (if anything is left). */ |
| 1082 | for (len -= cnt, p = buf, n = sizeof(buf); len > 0; p = buf, len -= n, |
| 1083 | n = sizeof(buf)) { |
| 1084 | n = MIN(n, len); |
| 1085 | #ifdef TPM_DEBUG |
| 1086 | aprint_debug_dev(sc->sc_dev, "%s: n %zu len %zu\n" , __func__, |
| 1087 | n, len); |
| 1088 | #endif |
| 1089 | if ((rv = (*sc->sc_read)(sc, p, n, NULL, TPM_PARAM_SIZE))) { |
| 1090 | (*sc->sc_end)(sc, UIO_READ, rv); |
| 1091 | goto out; |
| 1092 | } |
| 1093 | p += n; |
| 1094 | if ((rv = uiomove(buf, p - buf, uio))) { |
| 1095 | #ifdef TPM_DEBUG |
| 1096 | aprint_debug_dev(sc->sc_dev, |
| 1097 | "%s: uiomove failed %d\n" , __func__, rv); |
| 1098 | #endif |
| 1099 | (*sc->sc_end)(sc, UIO_READ, rv); |
| 1100 | goto out; |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | rv = (*sc->sc_end)(sc, UIO_READ, rv); |
| 1105 | out: |
| 1106 | splx(s); |
| 1107 | return rv; |
| 1108 | } |
| 1109 | |
| 1110 | int |
| 1111 | tpmwrite(dev_t dev, struct uio *uio, int flags) |
| 1112 | { |
| 1113 | struct tpm_softc *sc = device_lookup_private(&tpm_cd, TPMUNIT(dev)); |
| 1114 | uint8_t buf[TPM_BUFSIZ]; |
| 1115 | int n, rv, s; |
| 1116 | |
| 1117 | if (!sc) |
| 1118 | return ENXIO; |
| 1119 | |
| 1120 | s = spltty(); |
| 1121 | |
| 1122 | #ifdef TPM_DEBUG |
| 1123 | aprint_debug_dev(sc->sc_dev, "%s: io count %zu\n" , __func__, |
| 1124 | uio->uio_resid); |
| 1125 | #endif |
| 1126 | |
| 1127 | n = MIN(sizeof(buf), uio->uio_resid); |
| 1128 | if ((rv = uiomove(buf, n, uio))) { |
| 1129 | #ifdef TPM_DEBUG |
| 1130 | aprint_debug_dev(sc->sc_dev, |
| 1131 | "%s: uiomove failed %d\n" , __func__, rv); |
| 1132 | #endif |
| 1133 | splx(s); |
| 1134 | return rv; |
| 1135 | } |
| 1136 | |
| 1137 | if ((rv = (*sc->sc_start)(sc, UIO_WRITE))) { |
| 1138 | splx(s); |
| 1139 | return rv; |
| 1140 | } |
| 1141 | |
| 1142 | if ((rv = (*sc->sc_write)(sc, buf, n))) { |
| 1143 | splx(s); |
| 1144 | return rv; |
| 1145 | } |
| 1146 | |
| 1147 | rv = (*sc->sc_end)(sc, UIO_WRITE, rv); |
| 1148 | splx(s); |
| 1149 | return rv; |
| 1150 | } |
| 1151 | |
| 1152 | int |
| 1153 | tpmioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) |
| 1154 | { |
| 1155 | return ENOTTY; |
| 1156 | } |
| 1157 | |