1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
2 /*
3 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <hwspinlock.h>
9 #include <asm/state.h>
10
sandbox_lock(struct udevice * dev,int index)11 static int sandbox_lock(struct udevice *dev, int index)
12 {
13 struct sandbox_state *state = state_get_current();
14
15 if (index != 0)
16 return -1;
17
18 if (state->hwspinlock)
19 return -1;
20
21 state->hwspinlock = true;
22
23 return 0;
24 }
25
sandbox_unlock(struct udevice * dev,int index)26 static int sandbox_unlock(struct udevice *dev, int index)
27 {
28 struct sandbox_state *state = state_get_current();
29
30 if (index != 0)
31 return -1;
32
33 if (!state->hwspinlock)
34 return -1;
35
36 state->hwspinlock = false;
37
38 return 0;
39 }
40
41 static const struct hwspinlock_ops sandbox_hwspinlock_ops = {
42 .lock = sandbox_lock,
43 .unlock = sandbox_unlock,
44 };
45
46 static const struct udevice_id sandbox_hwspinlock_ids[] = {
47 { .compatible = "sandbox,hwspinlock" },
48 {}
49 };
50
51 U_BOOT_DRIVER(hwspinlock_sandbox) = {
52 .name = "hwspinlock_sandbox",
53 .id = UCLASS_HWSPINLOCK,
54 .of_match = sandbox_hwspinlock_ids,
55 .ops = &sandbox_hwspinlock_ops,
56 };
57