1 /*
2 * Copyright (c) 2021-2023, Texas Instruments Incorporated
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of Texas Instruments Incorporated nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <stdint.h>
34 #include <stdbool.h>
35
36 #include <ti/drivers/dpl/SemaphoreP.h>
37 #include <ti/drivers/dpl/HwiP.h>
38 #include <ti/drivers/cryptoutils/sharedresources/CryptoResourceLPF3.h>
39
40 #include <ti/devices/DeviceFamily.h>
41 #include DeviceFamily_constructPath(inc/hw_ints.h)
42
43 /* Crypto driver semaphore used to control access to the AES engine */
44 SemaphoreP_Struct CryptoResourceLPF3_accessSemaphore;
45 SemaphoreP_Struct CryptoResourceLPF3_operationSemaphore;
46
47 HwiP_Struct CryptoResourceLPF3_hwi;
48
49 static bool CryptoResourceLPF3_isInitialized = false;
50
errorSpin(uintptr_t arg)51 static void errorSpin(uintptr_t arg)
52 {
53 while (1) {}
54 }
55
CryptoResourceLPF3_constructRTOSObjects(void)56 void CryptoResourceLPF3_constructRTOSObjects(void)
57 {
58 HwiP_Params hwiParams;
59 uintptr_t key;
60
61 key = HwiP_disable();
62
63 if (!CryptoResourceLPF3_isInitialized)
64 {
65 /*
66 * Construct the common Hwi with a dummy ISR function. This should not
67 * matter as the function is set whenever we start an operation after
68 * pending on CryptoResourceLPF3_accessSemaphore.
69 */
70 HwiP_Params_init(&hwiParams);
71 hwiParams.priority = (uint32_t)~0U;
72 hwiParams.enableInt = false;
73 (void)HwiP_construct(&CryptoResourceLPF3_hwi, INT_AES_COMB, errorSpin, &hwiParams);
74
75 (void)SemaphoreP_constructBinary(&CryptoResourceLPF3_accessSemaphore, 1U);
76 (void)SemaphoreP_constructBinary(&CryptoResourceLPF3_operationSemaphore, 0U);
77
78 CryptoResourceLPF3_isInitialized = true;
79 }
80
81 HwiP_restore(key);
82 }
83
CryptoResourceLPF3_acquireLock(uint32_t timeout)84 bool CryptoResourceLPF3_acquireLock(uint32_t timeout)
85 {
86 SemaphoreP_Status resourceAcquired;
87
88 /* Try and obtain access to the crypto module */
89 resourceAcquired = SemaphoreP_pend(&CryptoResourceLPF3_accessSemaphore, timeout);
90
91 return (resourceAcquired == SemaphoreP_OK);
92 }
93
CryptoResourceLPF3_releaseLock(void)94 void CryptoResourceLPF3_releaseLock(void)
95 {
96 SemaphoreP_post(&CryptoResourceLPF3_accessSemaphore);
97 }
98
