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author | Philipp Zabel <p.zabel@pengutronix.de> | 2017-08-11 12:58:43 +0200 |
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committer | Philipp Zabel <p.zabel@pengutronix.de> | 2017-10-17 15:35:20 +0200 |
commit | 81c22ad0cc7db056408d6089c9303b2f6e486518 (patch) | |
tree | 28322e2d9c3e435ca4688311f3fc4f5b61649974 /drivers/reset/reset-simple.h | |
parent | 7e8838fe59515860823233353227e89b82b8794e (diff) | |
download | linux-81c22ad0cc7db056408d6089c9303b2f6e486518.tar.gz linux-81c22ad0cc7db056408d6089c9303b2f6e486518.tar.bz2 linux-81c22ad0cc7db056408d6089c9303b2f6e486518.zip |
reset: add reset-simple to unify socfpga, stm32, sunxi, and zx2967
Copy reusable parts from the sunxi driver, to add a driver for simple
reset controllers with reset lines that can be controlled by toggling
bits in exclusive, contiguous register ranges using read-modify-write
cycles under a spinlock.
The following patches will replace compatible reset drivers with
reset-simple, extending it where necessary.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'drivers/reset/reset-simple.h')
-rw-r--r-- | drivers/reset/reset-simple.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/reset/reset-simple.h b/drivers/reset/reset-simple.h new file mode 100644 index 000000000000..39af2014b5f1 --- /dev/null +++ b/drivers/reset/reset-simple.h @@ -0,0 +1,41 @@ +/* + * Simple Reset Controller ops + * + * Based on Allwinner SoCs Reset Controller driver + * + * Copyright 2013 Maxime Ripard + * + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef __RESET_SIMPLE_H__ +#define __RESET_SIMPLE_H__ + +#include <linux/io.h> +#include <linux/reset-controller.h> +#include <linux/spinlock.h> + +/** + * struct reset_simple_data - driver data for simple reset controllers + * @lock: spinlock to protect registers during read-modify-write cycles + * @membase: memory mapped I/O register range + * @rcdev: reset controller device base structure + * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits + * are set to assert the reset. Note that this says nothing about + * the voltage level of the actual reset line. + */ +struct reset_simple_data { + spinlock_t lock; + void __iomem *membase; + struct reset_controller_dev rcdev; + bool active_low; +}; + +extern const struct reset_control_ops reset_simple_ops; + +#endif /* __RESET_SIMPLE_H__ */ |