drivers/reset/sti/reset-syscfg.h

   1 /*
   2  * Copyright (C) 2013 STMicroelectronics (R&D) Limited
   3  * Author: Stephen Gallimore <stephen.gallimore@st.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10 #ifndef __STI_RESET_SYSCFG_H
  11 #define __STI_RESET_SYSCFG_H
  12
  13 #include <linux/device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/reset-controller.h>
  16
  17 /**
  18  * Reset channel description for a system configuration register based
  19  * reset controller.
  20  *
  21  * @compatible: Compatible string of the syscon regmap containing this
  22  *              channel's control and ack (status) bits.
  23  * @reset: Regmap field description of the channel's reset bit.
  24  * @ack: Regmap field description of the channel's acknowledge bit.
  25  */
  26 struct syscfg_reset_channel_data {
  27         const char *compatible;
  28         struct reg_field reset;
  29         struct reg_field ack;
  30 };
  31
  32 #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab)          \
  33         { .compatible   = _c,                           \
  34           .reset        = REG_FIELD(_rr, _rb, _rb),     \
  35           .ack          = REG_FIELD(_ar, _ab, _ab), }
  36
  37 #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb)             \
  38         { .compatible   = _c,                   \
  39           .reset        = REG_FIELD(_rr, _rb, _rb), }
  40
  41 /**
  42  * Description of a system configuration register based reset controller.
  43  *
  44  * @wait_for_ack: The controller will wait for reset assert and de-assert to
  45  *                be "ack'd" in a channel's ack field.
  46  * @active_low: Are the resets in this controller active low, i.e. clearing
  47  *              the reset bit puts the hardware into reset.
  48  * @nr_channels: The number of reset channels in this controller.
  49  * @channels: An array of reset channel descriptions.
  50  */
  51 struct syscfg_reset_controller_data {
  52         bool wait_for_ack;
  53         bool active_low;
  54         int nr_channels;
  55         const struct syscfg_reset_channel_data *channels;
  56 };
  57
  58 /**
  59  * syscfg_reset_probe(): platform device probe function used by syscfg
  60  *                       reset controller drivers. This registers a reset
  61  *                       controller configured by the OF match data for
  62  *                       the compatible device which should be of type
  63  *                       "struct syscfg_reset_controller_data".
  64  *
  65  * @pdev: platform device
  66  */
  67 int syscfg_reset_probe(struct platform_device *pdev);
  68
  69 #endif /* __STI_RESET_SYSCFG_H */