diff options
author | Benjamin Gaignard <benjamin.gaignard@linaro.org> | 2018-11-27 15:49:50 +0300 |
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committer | Tom Rini <trini@konsulko.com> | 2018-12-07 07:26:32 +0300 |
commit | 7f84fc670b17fca3d8d1b7c9472a19bb8085c890 (patch) | |
tree | 5af913847507ee1d58408c5f053bcdb2731b0133 /drivers/hwspinlock/sandbox_hwspinlock.c | |
parent | 3b074fb22b8f09178200b969395fa9f3d97a67e6 (diff) | |
download | u-boot-7f84fc670b17fca3d8d1b7c9472a19bb8085c890.tar.xz |
dm: Add Hardware Spinlock class
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>
Diffstat (limited to 'drivers/hwspinlock/sandbox_hwspinlock.c')
-rw-r--r-- | drivers/hwspinlock/sandbox_hwspinlock.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/hwspinlock/sandbox_hwspinlock.c b/drivers/hwspinlock/sandbox_hwspinlock.c new file mode 100644 index 0000000000..be920f5f99 --- /dev/null +++ b/drivers/hwspinlock/sandbox_hwspinlock.c @@ -0,0 +1,56 @@ +// 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, +}; |