mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
7f84fc670b
This is uclass for Hardware Spinlocks. It implements two mandatory operations: lock and unlock and one optional relax operation. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
56 lines
1 KiB
C
56 lines
1 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
|
|
/*
|
|
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <hwspinlock.h>
|
|
#include <asm/state.h>
|
|
|
|
static int sandbox_lock(struct udevice *dev, int index)
|
|
{
|
|
struct sandbox_state *state = state_get_current();
|
|
|
|
if (index != 0)
|
|
return -1;
|
|
|
|
if (state->hwspinlock)
|
|
return -1;
|
|
|
|
state->hwspinlock = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_unlock(struct udevice *dev, int index)
|
|
{
|
|
struct sandbox_state *state = state_get_current();
|
|
|
|
if (index != 0)
|
|
return -1;
|
|
|
|
if (!state->hwspinlock)
|
|
return -1;
|
|
|
|
state->hwspinlock = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwspinlock_ops sandbox_hwspinlock_ops = {
|
|
.lock = sandbox_lock,
|
|
.unlock = sandbox_unlock,
|
|
};
|
|
|
|
static const struct udevice_id sandbox_hwspinlock_ids[] = {
|
|
{ .compatible = "sandbox,hwspinlock" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(hwspinlock_sandbox) = {
|
|
.name = "hwspinlock_sandbox",
|
|
.id = UCLASS_HWSPINLOCK,
|
|
.of_match = sandbox_hwspinlock_ids,
|
|
.ops = &sandbox_hwspinlock_ops,
|
|
};
|