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 #ifndef _TPM20_H_
29 #define _TPM20_H_
30
31 #include <sys/cdefs.h>
32 #include <sys/endian.h>
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/proc.h>
37 #include <sys/systm.h>
38
39 #include <sys/bus.h>
40 #include <sys/callout.h>
41 #include <sys/conf.h>
42 #include <sys/module.h>
43 #include <sys/rman.h>
44 #include <sys/sx.h>
45 #include <sys/taskqueue.h>
46 #include <sys/uio.h>
47
48 #include <machine/bus.h>
49 #include <machine/md_var.h>
50 #include <machine/resource.h>
51
52 #include <contrib/dev/acpica/include/acpi.h>
53 #include <contrib/dev/acpica/include/accommon.h>
54 #include <dev/acpica/acpivar.h>
55 #include "opt_acpi.h"
56
57 #include "opt_tpm.h"
58
59 #define BIT(x) (1 << (x))
60
61 /* Timeouts in us */
62 #define TPM_TIMEOUT_A 750000
63 #define TPM_TIMEOUT_B 2000000
64 #define TPM_TIMEOUT_C 200000
65 #define TPM_TIMEOUT_D 30000
66
67 /*
68 * Generating RSA key pair takes ~(10-20s), which is significantly longer than
69 * any timeout defined in spec. Because of that we need a new one.
70 */
71 #define TPM_TIMEOUT_LONG 40000000
72
73 /* List of commands that require TPM_TIMEOUT_LONG time to complete */
74 #define TPM_CC_CreatePrimary 0x00000131
75 #define TPM_CC_Create 0x00000153
76 #define TPM_CC_CreateLoaded 0x00000191
77
78 /* List of commands that require only TPM_TIMEOUT_C time to complete */
79 #define TPM_CC_SequenceComplete 0x0000013e
80 #define TPM_CC_Startup 0x00000144
81 #define TPM_CC_SequenceUpdate 0x0000015c
82 #define TPM_CC_GetCapability 0x0000017a
83 #define TPM_CC_PCR_Extend 0x00000182
84 #define TPM_CC_EventSequenceComplete 0x00000185
85 #define TPM_CC_HashSequenceStart 0x00000186
86
87 /* Timeout before data in read buffer is discarded */
88 #define TPM_READ_TIMEOUT 500000
89
90 #define TPM_BUFSIZE 0x1000
91
92 #define TPM_HEADER_SIZE 10
93
94 #define TPM_CDEV_NAME "tpm0"
95 #define TPM_CDEV_PERM_FLAG 0600
96
97 #define TPM2_START_METHOD_ACPI 2
98 #define TPM2_START_METHOD_TIS 6
99 #define TPM2_START_METHOD_CRB 7
100 #define TPM2_START_METHOD_CRB_ACPI 8
101
102 struct tpm_sc {
103 device_t dev;
104
105 struct resource *mem_res;
106 struct resource *irq_res;
107 int mem_rid;
108 int irq_rid;
109
110 struct cdev *sc_cdev;
111
112 struct sx dev_lock;
113 struct cv buf_cv;
114
115 void *intr_cookie;
116 int intr_type; /* Current event type */
117 bool interrupts;
118
119 uint8_t *buf;
120 size_t pending_data_length;
121 lwpid_t owner_tid;
122
123 struct callout discard_buffer_callout;
124 #ifdef TPM_HARVEST
125 struct timeout_task harvest_task;
126 #endif
127
128 int (*transmit)(struct tpm_sc *, size_t);
129 };
130
131 int tpm20_suspend(device_t dev);
132 int tpm20_shutdown(device_t dev);
133 int32_t tpm20_get_timeout(uint32_t command);
134 int tpm20_init(struct tpm_sc *sc);
135 void tpm20_release(struct tpm_sc *sc);
136
137 /* Small helper routines for io ops */
138 static inline uint8_t
RD1(struct tpm_sc * sc,bus_size_t off)139 RD1(struct tpm_sc *sc, bus_size_t off)
140 {
141
142 return (bus_read_1(sc->mem_res, off));
143 }
144 static inline uint32_t
RD4(struct tpm_sc * sc,bus_size_t off)145 RD4(struct tpm_sc *sc, bus_size_t off)
146 {
147
148 return (bus_read_4(sc->mem_res, off));
149 }
150 #ifdef __amd64__
151 static inline uint64_t
RD8(struct tpm_sc * sc,bus_size_t off)152 RD8(struct tpm_sc *sc, bus_size_t off)
153 {
154
155 return (bus_read_8(sc->mem_res, off));
156 }
157 #endif
158 static inline void
WR1(struct tpm_sc * sc,bus_size_t off,uint8_t val)159 WR1(struct tpm_sc *sc, bus_size_t off, uint8_t val)
160 {
161
162 bus_write_1(sc->mem_res, off, val);
163 }
164 static inline void
WR4(struct tpm_sc * sc,bus_size_t off,uint32_t val)165 WR4(struct tpm_sc *sc, bus_size_t off, uint32_t val)
166 {
167
168 bus_write_4(sc->mem_res, off, val);
169 }
170 static inline void
AND4(struct tpm_sc * sc,bus_size_t off,uint32_t val)171 AND4(struct tpm_sc *sc, bus_size_t off, uint32_t val)
172 {
173
174 WR4(sc, off, RD4(sc, off) & val);
175 }
176 static inline void
OR1(struct tpm_sc * sc,bus_size_t off,uint8_t val)177 OR1(struct tpm_sc *sc, bus_size_t off, uint8_t val)
178 {
179
180 WR1(sc, off, RD1(sc, off) | val);
181 }
182 static inline void
OR4(struct tpm_sc * sc,bus_size_t off,uint32_t val)183 OR4(struct tpm_sc *sc, bus_size_t off, uint32_t val)
184 {
185
186 WR4(sc, off, RD4(sc, off) | val);
187 }
188 #endif /* _TPM20_H_ */
189