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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>
57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <dm.h>
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#include <hwspinlock.h>
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#include <asm/state.h>
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static int sandbox_lock(struct udevice *dev, int index)
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{
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struct sandbox_state *state = state_get_current();
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if (index != 0)
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return -1;
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if (state->hwspinlock)
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return -1;
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state->hwspinlock = true;
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return 0;
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}
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static int sandbox_unlock(struct udevice *dev, int index)
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{
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struct sandbox_state *state = state_get_current();
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if (index != 0)
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return -1;
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if (!state->hwspinlock)
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return -1;
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state->hwspinlock = false;
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return 0;
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}
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static const struct hwspinlock_ops sandbox_hwspinlock_ops = {
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.lock = sandbox_lock,
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.unlock = sandbox_unlock,
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};
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static const struct udevice_id sandbox_hwspinlock_ids[] = {
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{ .compatible = "sandbox,hwspinlock" },
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{}
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};
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U_BOOT_DRIVER(hwspinlock_sandbox) = {
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.name = "hwspinlock_sandbox",
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.id = UCLASS_HWSPINLOCK,
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.of_match = sandbox_hwspinlock_ids,
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.ops = &sandbox_hwspinlock_ops,
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};
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