1 /******************************************************************************
2 *
3 * Copyright (C) 2022-2023 Maxim Integrated Products, Inc. (now owned by
4 * Analog Devices, Inc.),
5 * Copyright (C) 2023-2024 Analog Devices, Inc.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 ******************************************************************************/
20
21 /* **** Includes **** */
22 #include "mxc_device.h"
23 #include "mxc_lock.h"
24
25 #ifndef __riscv
26 /* ************************************************************************** */
MXC_GetLock(uint32_t * lock,uint32_t value)27 int MXC_GetLock(uint32_t *lock, uint32_t value)
28 {
29 do {
30 // Return if the lock is taken by a different thread
31 if (__LDREXW((volatile uint32_t *)lock) != 0) {
32 return E_BUSY;
33 }
34
35 // Attempt to take the lock
36 } while (__STREXW(value, (volatile uint32_t *)lock) != 0);
37
38 // Do not start any other memory access until memory barrier is complete
39 __DMB();
40
41 return E_NO_ERROR;
42 }
43
44 /* ************************************************************************** */
MXC_FreeLock(uint32_t * lock)45 void MXC_FreeLock(uint32_t *lock)
46 {
47 // Ensure memory operations complete before releasing lock
48 __DMB();
49 *lock = 0;
50 }
51 #else // __riscv
52 /* ************************************************************************** */
MXC_GetLock(uint32_t * lock,uint32_t value)53 int MXC_GetLock(uint32_t *lock, uint32_t value)
54 {
55 #warning "Unimplemented for RISCV"
56 return E_NO_ERROR;
57 }
58
59 /* ************************************************************************** */
MXC_FreeLock(uint32_t * lock)60 void MXC_FreeLock(uint32_t *lock)
61 {
62 #warning "Unimplemented for RISCV"
63 }
64 #endif
65
