/* * Copyright (c) 2008, 2009 Michael Shalayeff * Copyright (c) 2009, 2010 Hans-Joerg Hoexer * All rights reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * $FreeBSD: src/sys/dev/tpm/tpm.c,v 1.1 2010/08/12 00:16:18 takawata Exp $ */ /* #define TPM_DEBUG */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define TPM_BUFSIZ 1024 #define TPM_HDRSIZE 10 #define TPM_PARAM_SIZE 0x0001 #define IRQUNK -1 #define TPM_ACCESS 0x0000 /* acess register */ #define TPM_ACCESS_ESTABLISHMENT 0x01 /* establishment */ #define TPM_ACCESS_REQUEST_USE 0x02 /* request using locality */ #define TPM_ACCESS_REQUEST_PENDING 0x04 /* pending request */ #define TPM_ACCESS_SEIZE 0x08 /* request locality seize */ #define TPM_ACCESS_SEIZED 0x10 /* locality has been seized */ #define TPM_ACCESS_ACTIVE_LOCALITY 0x20 /* locality is active */ #define TPM_ACCESS_VALID 0x80 /* bits are valid */ #define TPM_ACCESS_BITS \ "\020\01EST\02REQ\03PEND\04SEIZE\05SEIZED\06ACT\010VALID" #define TPM_INTERRUPT_ENABLE 0x0008 #define TPM_GLOBAL_INT_ENABLE 0x80000000 /* enable ints */ #define TPM_CMD_READY_INT 0x00000080 /* cmd ready enable */ #define TPM_INT_EDGE_FALLING 0x00000018 #define TPM_INT_EDGE_RISING 0x00000010 #define TPM_INT_LEVEL_LOW 0x00000008 #define TPM_INT_LEVEL_HIGH 0x00000000 #define TPM_LOCALITY_CHANGE_INT 0x00000004 /* locality change enable */ #define TPM_STS_VALID_INT 0x00000002 /* int on TPM_STS_VALID is set */ #define TPM_DATA_AVAIL_INT 0x00000001 /* int on TPM_STS_DATA_AVAIL is set */ #define TPM_INTERRUPT_ENABLE_BITS \ "\020\040ENA\010RDY\03LOCH\02STSV\01DRDY" #define TPM_INT_VECTOR 0x000c /* 8 bit reg for 4 bit irq vector */ #define TPM_INT_STATUS 0x0010 /* bits are & 0x87 from TPM_INTERRUPT_ENABLE */ #define TPM_INTF_CAPABILITIES 0x0014 /* capability register */ #define TPM_INTF_BURST_COUNT_STATIC 0x0100 /* TPM_STS_BMASK static */ #define TPM_INTF_CMD_READY_INT 0x0080 /* int on ready supported */ #define TPM_INTF_INT_EDGE_FALLING 0x0040 /* falling edge ints supported */ #define TPM_INTF_INT_EDGE_RISING 0x0020 /* rising edge ints supported */ #define TPM_INTF_INT_LEVEL_LOW 0x0010 /* level-low ints supported */ #define TPM_INTF_INT_LEVEL_HIGH 0x0008 /* level-high ints supported */ #define TPM_INTF_LOCALITY_CHANGE_INT 0x0004 /* locality-change int (mb 1) */ #define TPM_INTF_STS_VALID_INT 0x0002 /* TPM_STS_VALID int supported */ #define TPM_INTF_DATA_AVAIL_INT 0x0001 /* TPM_STS_DATA_AVAIL int supported (mb 1) */ #define TPM_CAPSREQ \ (TPM_INTF_DATA_AVAIL_INT|TPM_INTF_LOCALITY_CHANGE_INT|TPM_INTF_INT_LEVEL_LOW) #define TPM_CAPBITS \ "\020\01IDRDY\02ISTSV\03ILOCH\04IHIGH\05ILOW\06IEDGE\07IFALL\010IRDY\011BCST" #define TPM_STS 0x0018 /* status register */ #define TPM_STS_MASK 0x000000ff /* status bits */ #define TPM_STS_BMASK 0x00ffff00 /* ro io burst size */ #define TPM_STS_VALID 0x00000080 /* ro other bits are valid */ #define TPM_STS_CMD_READY 0x00000040 /* rw chip/signal ready */ #define TPM_STS_GO 0x00000020 /* wo start the command */ #define TPM_STS_DATA_AVAIL 0x00000010 /* ro data available */ #define TPM_STS_DATA_EXPECT 0x00000008 /* ro more data to be written */ #define TPM_STS_RESP_RETRY 0x00000002 /* wo resend the response */ #define TPM_STS_BITS "\020\010VALID\07RDY\06GO\05DRDY\04EXPECT\02RETRY" #define TPM_DATA 0x0024 #define TPM_ID 0x0f00 #define TPM_REV 0x0f04 #define TPM_SIZE 0x5000 /* five pages of the above */ #define TPM_ACCESS_TMO 2000 /* 2sec */ #define TPM_READY_TMO 2000 /* 2sec */ #define TPM_READ_TMO 120000 /* 2 minutes */ #define TPM_BURST_TMO 2000 /* 2sec */ #define TPM_LEGACY_BUSY 0x01 #define TPM_LEGACY_ABRT 0x01 #define TPM_LEGACY_DA 0x02 #define TPM_LEGACY_RE 0x04 #define TPM_LEGACY_LAST 0x04 #define TPM_LEGACY_BITS "\020\01BUSY\2DA\3RE\4LAST" #define TPM_LEGACY_TMO (2*60) /* sec */ #define TPM_LEGACY_SLEEP 5 /* ticks */ #define TPM_LEGACY_DELAY 100 /* Set when enabling legacy interface in host bridge. */ int tpm_enabled; #define TPMSOFTC(dev) \ ((struct tpm_softc *)dev->si_drv1) d_open_t tpmopen; d_close_t tpmclose; d_read_t tpmread; d_write_t tpmwrite; d_ioctl_t tpmioctl; static struct dev_ops tpm_ops = { { "tpm", 0, 0 }, .d_open = tpmopen, .d_close = tpmclose, .d_read = tpmread, .d_write = tpmwrite, .d_ioctl = tpmioctl, }; const struct { u_int32_t devid; char name[32]; int flags; #define TPM_DEV_NOINTS 0x0001 } tpm_devs[] = { { 0x000615d1, "IFX SLD 9630 TT 1.1", 0 }, { 0x000b15d1, "IFX SLB 9635 TT 1.2", 0 }, { 0x100214e4, "Broadcom BCM0102", TPM_DEV_NOINTS }, { 0x00fe1050, "WEC WPCT200", 0 }, { 0x687119fa, "SNS SSX35", 0 }, { 0x2e4d5453, "STM ST19WP18", 0 }, { 0x32021114, "ATML 97SC3203", TPM_DEV_NOINTS }, { 0x10408086, "INTEL INTC0102", 0 }, { 0, "", TPM_DEV_NOINTS }, }; int tpm_tis12_irqinit(struct tpm_softc *, int, int); int tpm_tis12_init(struct tpm_softc *, int, const char *); int tpm_tis12_start(struct tpm_softc *, int); int tpm_tis12_read(struct tpm_softc *, void *, int, size_t *, int); int tpm_tis12_write(struct tpm_softc *, void *, int); int tpm_tis12_end(struct tpm_softc *, int, int); void tpm_intr(void *); int tpm_waitfor_poll(struct tpm_softc *, u_int8_t, int, void *); int tpm_waitfor_int(struct tpm_softc *, u_int8_t, int, void *, int); int tpm_waitfor(struct tpm_softc *, u_int8_t, int, void *); int tpm_request_locality(struct tpm_softc *, int); int tpm_getburst(struct tpm_softc *); u_int8_t tpm_status(struct tpm_softc *); int tpm_tmotohz(int); int tpm_legacy_probe(bus_space_tag_t, bus_addr_t); int tpm_legacy_init(struct tpm_softc *, int, const char *); int tpm_legacy_start(struct tpm_softc *, int); int tpm_legacy_read(struct tpm_softc *, void *, int, size_t *, int); int tpm_legacy_write(struct tpm_softc *, void *, int); int tpm_legacy_end(struct tpm_softc *, int, int); /* * FreeBSD specific code for probing and attaching TPM to device tree. */ #if 0 static void tpm_identify(driver_t *driver, device_t parent) { BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, "tpm", 0); } #endif int tpm_attach(device_t dev) { struct tpm_softc *sc = device_get_softc(dev); int irq; sc->mem_rid = 0; sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->mem_rid, RF_ACTIVE); if (sc->mem_res == NULL) return ENXIO; sc->sc_bt = rman_get_bustag(sc->mem_res); sc->sc_bh = rman_get_bushandle(sc->mem_res); sc->irq_rid = 0; sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irq_rid, RF_ACTIVE | RF_SHAREABLE); if (sc->irq_res != NULL) irq = rman_get_start(sc->irq_res); else irq = IRQUNK; /* In case PnP probe this may contain some initialization. */ tpm_tis12_probe(sc->sc_bt, sc->sc_bh); if (tpm_legacy_probe(sc->sc_bt, sc->sc_bh)) { sc->sc_init = tpm_legacy_init; sc->sc_start = tpm_legacy_start; sc->sc_read = tpm_legacy_read; sc->sc_write = tpm_legacy_write; sc->sc_end = tpm_legacy_end; } else { sc->sc_init = tpm_tis12_init; sc->sc_start = tpm_tis12_start; sc->sc_read = tpm_tis12_read; sc->sc_write = tpm_tis12_write; sc->sc_end = tpm_tis12_end; } kprintf("%s", device_get_name(dev)); if ((sc->sc_init)(sc, irq, "tpm")) { tpm_detach(dev); return ENXIO; } if (sc->sc_init == tpm_tis12_init && sc->irq_res != NULL && bus_setup_intr(dev, sc->irq_res, 0, tpm_intr, sc, &sc->intr_cookie, NULL) != 0) { tpm_detach(dev); kprintf(": cannot establish interrupt\n"); return 1; } sc->sc_cdev = make_dev(&tpm_ops, device_get_unit(dev), UID_ROOT, GID_WHEEL, 0600, "tpm"); sc->sc_cdev->si_drv1 = sc; return 0; } int tpm_detach(device_t dev) { struct tpm_softc * sc = device_get_softc(dev); if(sc->intr_cookie){ bus_teardown_intr(dev, sc->irq_res, sc->intr_cookie); } if(sc->mem_res){ bus_release_resource(dev, SYS_RES_MEMORY, sc->mem_rid, sc->mem_res); } if(sc->irq_res){ bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, sc->irq_res); } if(sc->sc_cdev){ destroy_dev(sc->sc_cdev); } return 0; } /* Probe TPM using TIS 1.2 interface. */ int tpm_tis12_probe(bus_space_tag_t bt, bus_space_handle_t bh) { u_int32_t r; u_int8_t save, reg; r = bus_space_read_4(bt, bh, TPM_INTF_CAPABILITIES); if (r == 0xffffffff) return 0; #ifdef TPM_DEBUG kprintf("tpm: caps=%b\n", r, TPM_CAPBITS); #endif if ((r & TPM_CAPSREQ) != TPM_CAPSREQ || !(r & (TPM_INTF_INT_EDGE_RISING | TPM_INTF_INT_LEVEL_LOW))) { #ifdef TPM_DEBUG kprintf("tpm: caps too low (caps=%b)\n", r, TPM_CAPBITS); #endif return 0; } save = bus_space_read_1(bt, bh, TPM_ACCESS); bus_space_write_1(bt, bh, TPM_ACCESS, TPM_ACCESS_REQUEST_USE); reg = bus_space_read_1(bt, bh, TPM_ACCESS); if ((reg & TPM_ACCESS_VALID) && (reg & TPM_ACCESS_ACTIVE_LOCALITY) && bus_space_read_4(bt, bh, TPM_ID) != 0xffffffff) return 1; bus_space_write_1(bt, bh, TPM_ACCESS, save); return 0; } /* * Setup interrupt vector if one is provided and interrupts are know to * work on that particular chip. */ int tpm_tis12_irqinit(struct tpm_softc *sc, int irq, int idx) { u_int32_t r; if ((irq == IRQUNK) || (tpm_devs[idx].flags & TPM_DEV_NOINTS)) { sc->sc_vector = IRQUNK; return 0; } /* Ack and disable all interrupts. */ bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) & ~TPM_GLOBAL_INT_ENABLE); bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS)); /* Program interrupt vector. */ bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_INT_VECTOR, irq); sc->sc_vector = irq; /* Program interrupt type. */ if (sc->sc_capabilities & TPM_INTF_INT_EDGE_RISING) r = TPM_INT_EDGE_RISING; else if (sc->sc_capabilities & TPM_INTF_INT_LEVEL_HIGH) r = TPM_INT_LEVEL_HIGH; else r = TPM_INT_LEVEL_LOW; bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, r); return 0; } /* Setup TPM using TIS 1.2 interface. */ int tpm_tis12_init(struct tpm_softc *sc, int irq, const char *name) { u_int32_t r; int i; r = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTF_CAPABILITIES); #ifdef TPM_DEBUG kprintf(" caps=%b ", r, TPM_CAPBITS); #endif if ((r & TPM_CAPSREQ) != TPM_CAPSREQ || !(r & (TPM_INTF_INT_EDGE_RISING | TPM_INTF_INT_LEVEL_LOW))) { kprintf(": capabilities too low (caps=%b)\n", r, TPM_CAPBITS); return 1; } sc->sc_capabilities = r; sc->sc_devid = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_ID); sc->sc_rev = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_REV); for (i = 0; tpm_devs[i].devid; i++) if (tpm_devs[i].devid == sc->sc_devid) break; if (tpm_devs[i].devid) kprintf(": %s rev 0x%x\n", tpm_devs[i].name, sc->sc_rev); else kprintf(": device 0x%08x rev 0x%x\n", sc->sc_devid, sc->sc_rev); if (tpm_tis12_irqinit(sc, irq, i)) return 1; if (tpm_request_locality(sc, 0)) return 1; /* Abort whatever it thought it was doing. */ bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_CMD_READY); return 0; } int tpm_request_locality(struct tpm_softc *sc, int l) { u_int32_t r; int to, rv; if (l != 0) return EINVAL; if ((bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS) & (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) == (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) return 0; bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS, TPM_ACCESS_REQUEST_USE); to = tpm_tmotohz(TPM_ACCESS_TMO); while ((r = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_ACCESS) & (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) != (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY) && to--) { rv = tsleep(sc->sc_init, PCATCH, "tpm_locality", 1); if (rv && rv != EWOULDBLOCK) { #ifdef TPM_DEBUG kprintf("%s: interrupted %d\n", __func__, rv); #endif return rv; } } if ((r & (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) != (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY)) { #ifdef TPM_DEBUG kprintf("%s: access %b\n", __func__, r, TPM_ACCESS_BITS); #endif return EBUSY; } return 0; } int tpm_getburst(struct tpm_softc *sc) { int burst, to, rv; to = tpm_tmotohz(TPM_BURST_TMO); burst = 0; while (burst == 0 && to--) { /* * Burst count has to be read from bits 8 to 23 without * touching any other bits, eg. the actual status bits 0 * to 7. */ burst = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS + 1); burst |= bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS + 2) << 8; #ifdef TPM_DEBUG kprintf("%s: read %d\n", __func__, burst); #endif if (burst) return burst; rv = tsleep(sc, PCATCH, "tpm_getburst", 1); if (rv && rv != EWOULDBLOCK) { return 0; } } return 0; } u_int8_t tpm_status(struct tpm_softc *sc) { u_int8_t status; status = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_STS) & TPM_STS_MASK; return status; } int tpm_tmotohz(int tmo) { struct timeval tv; tv.tv_sec = tmo / 1000; tv.tv_usec = 1000 * (tmo % 1000); return tvtohz_high(&tv); } /* Save TPM state on suspend. */ int tpm_suspend(device_t dev) { struct tpm_softc *sc = device_get_softc(dev); int why = 1; u_int8_t command[] = { 0, 193, /* TPM_TAG_RQU_COMMAND */ 0, 0, 0, 10, /* Length in bytes */ 0, 0, 0, 156 /* TPM_ORD_SaveStates */ }; /* * Power down: We have to issue the SaveStates command. */ sc->sc_write(sc, &command, sizeof(command)); sc->sc_read(sc, &command, sizeof(command), NULL, TPM_HDRSIZE); #ifdef TPM_DEBUG kprintf("%s: power down: %d -> %d\n", __func__, sc->sc_suspend, why); #endif sc->sc_suspend = why; return 0; } /* * Handle resume event. Actually nothing to do as the BIOS is supposed * to restore the previously saved state. */ int tpm_resume(device_t dev) { struct tpm_softc *sc = device_get_softc(dev); int why = 0; #ifdef TPM_DEBUG kprintf("%s: resume: %d -> %d\n", __func__, sc->sc_suspend, why); #endif sc->sc_suspend = why; return 0; } /* Wait for given status bits using polling. */ int tpm_waitfor_poll(struct tpm_softc *sc, u_int8_t mask, int tmo, void *c) { int rv; /* * Poll until either the requested condition or a time out is * met. */ while (((sc->sc_stat = tpm_status(sc)) & mask) != mask && tmo--) { rv = tsleep(c, PCATCH, "tpm_poll", 1); if (rv && rv != EWOULDBLOCK) { #ifdef TPM_DEBUG kprintf("%s: interrupted %d\n", __func__, rv); #endif return rv; } } return 0; } /* Wait for given status bits using interrupts. */ int tpm_waitfor_int(struct tpm_softc *sc, u_int8_t mask, int tmo, void *c, int inttype) { int rv, to; /* Poll and return when condition is already met. */ sc->sc_stat = tpm_status(sc); if ((sc->sc_stat & mask) == mask) return 0; /* * Enable interrupt on tpm chip. Note that interrupts on our * level (SPL_TTY) are disabled (see tpm{read,write} et al) and * will not be delivered to the cpu until we call tsleep(9) below. */ bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) | inttype); bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) | TPM_GLOBAL_INT_ENABLE); /* * Poll once more to remedy the race between previous polling * and enabling interrupts on the tpm chip. */ sc->sc_stat = tpm_status(sc); if ((sc->sc_stat & mask) == mask) { rv = 0; goto out; } to = tpm_tmotohz(tmo); #ifdef TPM_DEBUG kprintf("%s: sleeping for %d ticks on %p\n", __func__, to, c); #endif /* * tsleep(9) enables interrupts on the cpu and returns after * wake up with interrupts disabled again. Note that interrupts * generated by the tpm chip while being at SPL_TTY are not lost * but held and delivered as soon as the cpu goes below SPL_TTY. */ rv = tsleep(c, PCATCH, "tpm_intr", to); sc->sc_stat = tpm_status(sc); #ifdef TPM_DEBUG kprintf("%s: woke up with rv %d stat %b\n", __func__, rv, sc->sc_stat, TPM_STS_BITS); #endif if ((sc->sc_stat & mask) == mask) rv = 0; /* Disable interrupts on tpm chip again. */ out: bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) & ~TPM_GLOBAL_INT_ENABLE); bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE, bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) & ~inttype); return rv; } /* * Wait on given status bits, uses interrupts where possible, otherwise polls. */ int tpm_waitfor(struct tpm_softc *sc, u_int8_t b0, int tmo, void *c) { u_int8_t b; int re, to, rv; #ifdef TPM_DEBUG kprintf("%s: b0 %b\n", __func__, b0, TPM_STS_BITS); #endif /* * If possible, use interrupts, otherwise poll. * * We use interrupts for TPM_STS_VALID and TPM_STS_DATA_AVAIL (if * the tpm chips supports them) as waiting for those can take * really long. The other TPM_STS* are not needed very often * so we do not support them. */ if (sc->sc_vector != IRQUNK) { b = b0; /* * Wait for data ready. This interrupt only occures * when both TPM_STS_VALID and TPM_STS_DATA_AVAIL are asserted. * Thus we don't have to bother with TPM_STS_VALID * separately and can just return. * * This only holds for interrupts! When using polling * both flags have to be waited for, see below. */ if ((b & TPM_STS_DATA_AVAIL) && (sc->sc_capabilities & TPM_INTF_DATA_AVAIL_INT)) return tpm_waitfor_int(sc, b, tmo, c, TPM_DATA_AVAIL_INT); /* Wait for status valid bit. */ if ((b & TPM_STS_VALID) && (sc->sc_capabilities & TPM_INTF_STS_VALID_INT)) { rv = tpm_waitfor_int(sc, b, tmo, c, TPM_STS_VALID_INT); if (rv != 0) return rv; else b = b0 & ~TPM_STS_VALID; } /* * When all flags are taken care of, return. Otherwise * use polling for eg. TPM_STS_CMD_READY. */ if (b == 0) return 0; } re = 3; restart: /* * If requested wait for TPM_STS_VALID before dealing with * any other flag. Eg. when both TPM_STS_DATA_AVAIL and TPM_STS_VALID * are requested, wait for the latter first. */ b = b0; if (b0 & TPM_STS_VALID) b = TPM_STS_VALID; to = tpm_tmotohz(tmo); again: if ((rv = tpm_waitfor_poll(sc, b, to, c)) != 0) return rv; if ((b & sc->sc_stat) == TPM_STS_VALID) { /* Now wait for other flags. */ b = b0 & ~TPM_STS_VALID; to++; goto again; } if ((sc->sc_stat & b) != b) { #ifdef TPM_DEBUG kprintf("%s: timeout: stat=%b b=%b\n", __func__, sc->sc_stat, TPM_STS_BITS, b, TPM_STS_BITS); #endif if (re-- && (b0 & TPM_STS_VALID)) { bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_RESP_RETRY); goto restart; } return EIO; } return 0; } /* Start transaction. */ int tpm_tis12_start(struct tpm_softc *sc, int flag) { int rv; if (flag == UIO_READ) { rv = tpm_waitfor(sc, TPM_STS_DATA_AVAIL | TPM_STS_VALID, TPM_READ_TMO, sc->sc_read); return rv; } /* Own our (0th) locality. */ if ((rv = tpm_request_locality(sc, 0)) != 0) return rv; sc->sc_stat = tpm_status(sc); if (sc->sc_stat & TPM_STS_CMD_READY) { #ifdef TPM_DEBUG kprintf("%s: UIO_WRITE status %b\n", __func__, sc->sc_stat, TPM_STS_BITS); #endif return 0; } #ifdef TPM_DEBUG kprintf("%s: UIO_WRITE readying chip\n", __func__); #endif /* Abort previous and restart. */ bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_CMD_READY); if ((rv = tpm_waitfor(sc, TPM_STS_CMD_READY, TPM_READY_TMO, sc->sc_write))) { #ifdef TPM_DEBUG kprintf("%s: UIO_WRITE readying failed %d\n", __func__, rv); #endif return rv; } #ifdef TPM_DEBUG kprintf("%s: UIO_WRITE readying done\n", __func__); #endif return 0; } int tpm_tis12_read(struct tpm_softc *sc, void *buf, int len, size_t *count, int flags) { u_int8_t *p = buf; size_t cnt; int rv, n, bcnt; #ifdef TPM_DEBUG kprintf("%s: len %d\n", __func__, len); #endif cnt = 0; while (len > 0) { if ((rv = tpm_waitfor(sc, TPM_STS_DATA_AVAIL | TPM_STS_VALID, TPM_READ_TMO, sc->sc_read))) return rv; bcnt = tpm_getburst(sc); n = MIN(len, bcnt); #ifdef TPM_DEBUG kprintf("%s: fetching %d, burst is %d\n", __func__, n, bcnt); #endif for (; n--; len--) { *p++ = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_DATA); cnt++; } if ((flags & TPM_PARAM_SIZE) == 0 && cnt >= 6) break; } #ifdef TPM_DEBUG kprintf("%s: read %zd bytes, len %d\n", __func__, cnt, len); #endif if (count) *count = cnt; return 0; } int tpm_tis12_write(struct tpm_softc *sc, void *buf, int len) { u_int8_t *p = buf; size_t cnt; int rv, r; #ifdef TPM_DEBUG kprintf("%s: sc %p buf %p len %d\n", __func__, sc, buf, len); #endif if ((rv = tpm_request_locality(sc, 0)) != 0) return rv; cnt = 0; while (cnt < len - 1) { for (r = tpm_getburst(sc); r > 0 && cnt < len - 1; r--) { bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_DATA, *p++); cnt++; } if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, sc))) { #ifdef TPM_DEBUG kprintf("%s: failed burst rv %d\n", __func__, rv); #endif return rv; } sc->sc_stat = tpm_status(sc); if (!(sc->sc_stat & TPM_STS_DATA_EXPECT)) { #ifdef TPM_DEBUG kprintf("%s: failed rv %d stat=%b\n", __func__, rv, sc->sc_stat, TPM_STS_BITS); #endif return EIO; } } bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_DATA, *p++); cnt++; if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, sc))) { #ifdef TPM_DEBUG kprintf("%s: failed last byte rv %d\n", __func__, rv); #endif return rv; } if ((sc->sc_stat & TPM_STS_DATA_EXPECT) != 0) { #ifdef TPM_DEBUG kprintf("%s: failed rv %d stat=%b\n", __func__, rv, sc->sc_stat, TPM_STS_BITS); #endif return EIO; } #ifdef TPM_DEBUG kprintf("%s: wrote %zd byte\n", __func__, cnt); #endif return 0; } /* Finish transaction. */ int tpm_tis12_end(struct tpm_softc *sc, int flag, int err) { int rv = 0; if (flag == UIO_READ) { if ((rv = tpm_waitfor(sc, TPM_STS_VALID, TPM_READ_TMO, sc->sc_read))) return rv; /* Still more data? */ sc->sc_stat = tpm_status(sc); if (!err && ((sc->sc_stat & TPM_STS_DATA_AVAIL) == TPM_STS_DATA_AVAIL)) { #ifdef TPM_DEBUG kprintf("%s: read failed stat=%b\n", __func__, sc->sc_stat, TPM_STS_BITS); #endif rv = EIO; } bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, TPM_STS_CMD_READY); /* Release our (0th) locality. */ bus_space_write_1(sc->sc_bt, sc->sc_bh,TPM_ACCESS, TPM_ACCESS_ACTIVE_LOCALITY); } else { /* Hungry for more? */ sc->sc_stat = tpm_status(sc); if (!err && (sc->sc_stat & TPM_STS_DATA_EXPECT)) { #ifdef TPM_DEBUG kprintf("%s: write failed stat=%b\n", __func__, sc->sc_stat, TPM_STS_BITS); #endif rv = EIO; } bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS, err ? TPM_STS_CMD_READY : TPM_STS_GO); } return rv; } void tpm_intr(void *v) { struct tpm_softc *sc = v; u_int32_t r; #ifdef TPM_DEBUG static int cnt = 0; #endif r = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS); #ifdef TPM_DEBUG if (r != 0) kprintf("%s: int=%b (%d)\n", __func__, r, TPM_INTERRUPT_ENABLE_BITS, cnt); else cnt++; #endif if (!(r & (TPM_CMD_READY_INT | TPM_LOCALITY_CHANGE_INT | TPM_STS_VALID_INT | TPM_DATA_AVAIL_INT))) return; if (r & TPM_STS_VALID_INT) wakeup(sc); if (r & TPM_CMD_READY_INT) wakeup(sc->sc_write); if (r & TPM_DATA_AVAIL_INT) wakeup(sc->sc_read); if (r & TPM_LOCALITY_CHANGE_INT) wakeup(sc->sc_init); bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS, r); return; } /* Read single byte using legacy interface. */ static inline u_int8_t tpm_legacy_in(bus_space_tag_t iot, bus_space_handle_t ioh, int reg) { bus_space_write_1(iot, ioh, 0, reg); return bus_space_read_1(iot, ioh, 1); } /* Write single byte using legacy interface. */ static inline void tpm_legacy_out(bus_space_tag_t iot, bus_space_handle_t ioh, int reg, u_int8_t v) { bus_space_write_1(iot, ioh, 0, reg); bus_space_write_1(iot, ioh, 1, v); } /* Probe for TPM using legacy interface. */ int tpm_legacy_probe(bus_space_tag_t iot, bus_addr_t iobase) { bus_space_handle_t ioh; u_int8_t r, v; int i, rv = 0; char id[8]; if (!tpm_enabled || iobase == -1) return 0; #if 0 /* XXX swildner*/ if (bus_space_map(iot, iobase, 2, 0, &ioh)) return 0; #else ioh = iobase; #endif v = bus_space_read_1(iot, ioh, 0); if (v == 0xff) { bus_space_unmap(iot, ioh, 2); return 0; } r = bus_space_read_1(iot, ioh, 1); for (i = sizeof(id); i--; ) id[i] = tpm_legacy_in(iot, ioh, TPM_ID + i); #ifdef TPM_DEBUG kprintf("%s: %.4s %d.%d.%d.%d\n", __func__, &id[4], id[0], id[1], id[2], id[3]); #endif /* * The only chips using the legacy interface we are aware of are * by Atmel. For other chips more signature would have to be added. */ if (!bcmp(&id[4], "ATML", 4)) rv = 1; if (!rv) { bus_space_write_1(iot, ioh, r, 1); bus_space_write_1(iot, ioh, v, 0); } bus_space_unmap(iot, ioh, 2); return rv; } /* Setup TPM using legacy interface. */ int tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name) { char id[8]; u_int8_t ioh, iol; int i; #if 0 /* XXX swildner*/ if ((i = bus_space_map(sc->sc_batm, tpm_enabled, 2, 0, &sc->sc_bahm))) { kprintf(": cannot map tpm registers (%d)\n", i); tpm_enabled = 0; return 1; } #else sc->sc_bahm = tpm_enabled; #endif for (i = sizeof(id); i--; ) id[i] = tpm_legacy_in(sc->sc_bt, sc->sc_bh, TPM_ID + i); kprintf(": %.4s %d.%d @0x%x\n", &id[4], id[0], id[1], tpm_enabled); iol = tpm_enabled & 0xff; ioh = tpm_enabled >> 16; tpm_enabled = 0; return 0; } /* Start transaction. */ int tpm_legacy_start(struct tpm_softc *sc, int flag) { struct timeval tv; u_int8_t bits, r; int to, rv; bits = flag == UIO_READ ? TPM_LEGACY_DA : 0; tv.tv_sec = TPM_LEGACY_TMO; tv.tv_usec = 0; to = tvtohz_high(&tv) / TPM_LEGACY_SLEEP; while (((r = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1)) & (TPM_LEGACY_BUSY|bits)) != bits && to--) { rv = tsleep(sc, PCATCH, "legacy_tpm_start", TPM_LEGACY_SLEEP); if (rv && rv != EWOULDBLOCK) return rv; } if ((r & (TPM_LEGACY_BUSY|bits)) != bits) return EIO; return 0; } int tpm_legacy_read(struct tpm_softc *sc, void *buf, int len, size_t *count, int flags) { u_int8_t *p; size_t cnt; int to, rv; cnt = rv = 0; for (p = buf; !rv && len > 0; len--) { for (to = 1000; !(bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1) & TPM_LEGACY_DA); DELAY(1)) if (!to--) return EIO; DELAY(TPM_LEGACY_DELAY); *p++ = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 0); cnt++; } *count = cnt; return 0; } int tpm_legacy_write(struct tpm_softc *sc, void *buf, int len) { u_int8_t *p; int n; for (p = buf, n = len; n--; DELAY(TPM_LEGACY_DELAY)) { if (!n && len != TPM_BUFSIZ) { bus_space_write_1(sc->sc_batm, sc->sc_bahm, 1, TPM_LEGACY_LAST); DELAY(TPM_LEGACY_DELAY); } bus_space_write_1(sc->sc_batm, sc->sc_bahm, 0, *p++); } return 0; } /* Finish transaction. */ int tpm_legacy_end(struct tpm_softc *sc, int flag, int rv) { struct timeval tv; u_int8_t r; int to; if (rv || flag == UIO_READ) bus_space_write_1(sc->sc_batm, sc->sc_bahm, 1, TPM_LEGACY_ABRT); else { tv.tv_sec = TPM_LEGACY_TMO; tv.tv_usec = 0; to = tvtohz_high(&tv) / TPM_LEGACY_SLEEP; while(((r = bus_space_read_1(sc->sc_batm, sc->sc_bahm, 1)) & TPM_LEGACY_BUSY) && to--) { rv = tsleep(sc, PCATCH, "legacy_tpm_end", TPM_LEGACY_SLEEP); if (rv && rv != EWOULDBLOCK) return rv; } if (r & TPM_LEGACY_BUSY) return EIO; if (r & TPM_LEGACY_RE) return EIO; /* XXX Retry the loop? */ } return rv; } int tpmopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tpm_softc *sc = TPMSOFTC(dev); if (!sc) return ENXIO; if (sc->sc_flags & TPM_OPEN) return EBUSY; sc->sc_flags |= TPM_OPEN; return 0; } int tpmclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tpm_softc *sc = TPMSOFTC(dev); if (!sc) return ENXIO; if (!(sc->sc_flags & TPM_OPEN)) return EINVAL; sc->sc_flags &= ~TPM_OPEN; return 0; } int tpmread(struct dev_read_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; struct tpm_softc *sc = TPMSOFTC(dev); u_int8_t buf[TPM_BUFSIZ], *p; size_t cnt; int n, len, rv; if (!sc) return ENXIO; crit_enter(); if ((rv = (sc->sc_start)(sc, UIO_READ))) { crit_exit(); return rv; } #ifdef TPM_DEBUG kprintf("%s: getting header\n", __func__); #endif if ((rv = (sc->sc_read)(sc, buf, TPM_HDRSIZE, &cnt, 0))) { (sc->sc_end)(sc, UIO_READ, rv); crit_exit(); return rv; } len = (buf[2] << 24) | (buf[3] << 16) | (buf[4] << 8) | buf[5]; #ifdef TPM_DEBUG kprintf("%s: len %d, io count %zd\n", __func__, len, uio->uio_resid); #endif if (len > uio->uio_resid) { rv = EIO; (sc->sc_end)(sc, UIO_READ, rv); #ifdef TPM_DEBUG kprintf("%s: bad residual io count 0x%zx\n", __func__, uio->uio_resid); #endif crit_exit(); return rv; } /* Copy out header. */ if ((rv = uiomove((caddr_t)buf, cnt, uio))) { (sc->sc_end)(sc, UIO_READ, rv); crit_exit(); return rv; } /* Get remaining part of the answer (if anything is left). */ for (len -= cnt, p = buf, n = sizeof(buf); len > 0; p = buf, len -= n, n = sizeof(buf)) { n = MIN(n, len); #ifdef TPM_DEBUG kprintf("%s: n %d len %d\n", __func__, n, len); #endif if ((rv = (sc->sc_read)(sc, p, n, NULL, TPM_PARAM_SIZE))) { (sc->sc_end)(sc, UIO_READ, rv); crit_exit(); return rv; } p += n; if ((rv = uiomove((caddr_t)buf, p - buf, uio))) { (sc->sc_end)(sc, UIO_READ, rv); crit_exit(); return rv; } } rv = (sc->sc_end)(sc, UIO_READ, rv); crit_exit(); return rv; } int tpmwrite(struct dev_write_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; struct tpm_softc *sc = TPMSOFTC(dev); u_int8_t buf[TPM_BUFSIZ]; int n, rv; if (!sc) return ENXIO; crit_enter(); #ifdef TPM_DEBUG kprintf("%s: io count %zd\n", __func__, uio->uio_resid); #endif n = MIN(sizeof(buf), uio->uio_resid); if ((rv = uiomove((caddr_t)buf, n, uio))) { crit_exit(); return rv; } if ((rv = (sc->sc_start)(sc, UIO_WRITE))) { crit_exit(); return rv; } if ((rv = (sc->sc_write(sc, buf, n)))) { crit_exit(); return rv; } rv = (sc->sc_end)(sc, UIO_WRITE, rv); crit_exit(); return rv; } int tpmioctl(struct dev_ioctl_args *ap) { return ENOTTY; }