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tpm: Refactor TIS and add a SPI attachment
Summary: Though mostly used in x86 devices, TPM can be used on others, with a direct SPI attachment. Refactor the TPM 2.0 driver set to use an attachment interface, and implement a SPI bus interface. Test Plan: Tested on a Raspberry Pi 4, with a GeeekPi TPM2.0 module (SLB9670 TPM) using security/tpm2-tools tpm2_getcaps for very light testing against the spibus attachment. Reviewed by: kd Obtained from: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D45069
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /*- | ||
| * Copyright (c) 2023 Juniper Networks, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in the | ||
| * documentation and/or other materials provided with the distribution. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | ||
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | ||
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
||
| #include <sys/cdefs.h> | ||
| #include <sys/types.h> | ||
| #include <sys/bus.h> | ||
| #include "tpm_if.h" | ||
| #include "tpm20.h" | ||
|
|
||
| /* Override accessors */ | ||
| static uint8_t | ||
| tpm_read_1(device_t dev, bus_size_t off) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
|
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| return (bus_read_1(sc->mem_res, off)); | ||
| } | ||
|
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| static uint32_t | ||
| tpm_read_4(device_t dev, bus_size_t off) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
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| return (bus_read_4(sc->mem_res, off)); | ||
| } | ||
|
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| /* | ||
| * Only i386 is missing bus_space_read_8. | ||
| */ | ||
| #ifndef __i386__ | ||
| static uint64_t | ||
| tpm_read_8(device_t dev, bus_size_t off) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
|
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| return (bus_read_8(sc->mem_res, off)); | ||
| } | ||
| #endif | ||
|
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| static void | ||
| tpm_write_1(device_t dev, bus_size_t off, uint8_t val) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
|
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| bus_write_1(sc->mem_res, off, val); | ||
| } | ||
|
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| static void | ||
| tpm_write_4(device_t dev, bus_size_t off, uint32_t val) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
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| bus_write_4(sc->mem_res, off, val); | ||
| } | ||
|
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| static void | ||
| tpm_write_barrier(device_t dev, bus_addr_t off, bus_size_t length) | ||
| { | ||
| struct tpm_sc *sc = device_get_softc(dev); | ||
|
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| bus_barrier(sc->mem_res, off, length, BUS_SPACE_BARRIER_WRITE); | ||
| } | ||
|
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| static device_method_t tpm_bus_methods[] = { | ||
| DEVMETHOD(tpm_read_1, tpm_read_1), | ||
| DEVMETHOD(tpm_read_4, tpm_read_4), | ||
| #ifndef __i386__ | ||
| DEVMETHOD(tpm_read_8, tpm_read_8), | ||
| #endif | ||
| DEVMETHOD(tpm_write_1, tpm_write_1), | ||
| DEVMETHOD(tpm_write_4, tpm_write_4), | ||
| DEVMETHOD(tpm_write_barrier, tpm_write_barrier), | ||
| DEVMETHOD_END | ||
| }; | ||
|
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| DEFINE_CLASS_0(tpm_lbc, tpm_bus_driver, tpm_bus_methods, sizeof(struct tpm_sc)); |
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