drivers/reset/reset-simple.h

   1 /*
   2  * Simple Reset Controller ops
   3  *
   4  * Based on Allwinner SoCs Reset Controller driver
   5  *
   6  * Copyright 2013 Maxime Ripard
   7  *
   8  * Maxime Ripard <maxime.ripard@free-electrons.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  */
  15
  16 #ifndef __RESET_SIMPLE_H__
  17 #define __RESET_SIMPLE_H__
  18
  19 #include <linux/io.h>
  20 #include <linux/reset-controller.h>
  21 #include <linux/spinlock.h>
  22
  23 /**
  24  * struct reset_simple_data - driver data for simple reset controllers
  25  * @lock: spinlock to protect registers during read-modify-write cycles
  26  * @membase: memory mapped I/O register range
  27  * @rcdev: reset controller device base structure
  28  * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits
  29  *              are set to assert the reset. Note that this says nothing about
  30  *              the voltage level of the actual reset line.
  31  * @status_active_low: if true, bits read back as cleared while the reset is
  32  *                     asserted. Otherwise, bits read back as set while the
  33  *                     reset is asserted.
  34  */
  35 struct reset_simple_data {
  36         spinlock_t                      lock;
  37         void __iomem                    *membase;
  38         struct reset_controller_dev     rcdev;
  39         bool                            active_low;
  40         bool                            status_active_low;
  41 };
  42
  43 extern const struct reset_control_ops reset_simple_ops;
  44
  45 #endif /* __RESET_SIMPLE_H__ */