include/sysreset.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #ifndef __SYSRESET_H
   8 #define __SYSRESET_H
   9
  10 enum sysreset_t {
  11         SYSRESET_WARM,  /* Reset CPU, keep GPIOs active */
  12         SYSRESET_COLD,  /* Reset CPU and GPIOs */
  13         SYSRESET_POWER, /* Reset PMIC (remove and restore power) */
  14         SYSRESET_POWER_OFF,     /* Turn off power */
  15
  16         SYSRESET_COUNT,
  17 };
  18
  19 struct sysreset_ops {
  20         /**
  21          * request() - request a sysreset of the given type
  22          *
  23          * Note that this function may return before the reset takes effect.
  24          *
  25          * @type:       Reset type to request
  26          * @return -EINPROGRESS if the reset has been started and
  27          *              will complete soon, -EPROTONOSUPPORT if not supported
  28          *              by this device, 0 if the reset has already happened
  29          *              (in which case this method will not actually return)
  30          */
  31         int (*request)(struct udevice *dev, enum sysreset_t type);
  32         /**
  33          * get_status() - get printable reset status information
  34          *
  35          * @dev:        Device to check
  36          * @buf:        Buffer to receive the textual reset information
  37          * @size:       Size of the passed buffer
  38          * @return 0 if OK, -ve on error
  39          */
  40         int (*get_status)(struct udevice *dev, char *buf, int size);
  41
  42         /**
  43          * get_last() - get information on the last reset
  44          *
  45          * @dev:        Device to check
  46          * @return last reset state (enum sysreset_t) or -ve error
  47          */
  48         int (*get_last)(struct udevice *dev);
  49 };
  50
  51 #define sysreset_get_ops(dev)        ((struct sysreset_ops *)(dev)->driver->ops)
  52
  53 /**
  54  * sysreset_request() - request a sysreset
  55  *
  56  * @type:       Reset type to request
  57  * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device
  58  */
  59 int sysreset_request(struct udevice *dev, enum sysreset_t type);
  60
  61 /**
  62  * sysreset_get_status() - get printable reset status information
  63  *
  64  * @dev:        Device to check
  65  * @buf:        Buffer to receive the textual reset information
  66  * @size:       Size of the passed buffer
  67  * @return 0 if OK, -ve on error
  68  */
  69 int sysreset_get_status(struct udevice *dev, char *buf, int size);
  70
  71 /**
  72  * sysreset_get_last() - get information on the last reset
  73  *
  74  * @dev:        Device to check
  75  * @return last reset state (enum sysreset_t) or -ve error
  76  */
  77 int sysreset_get_last(struct udevice *dev);
  78
  79 /**
  80  * sysreset_walk() - cause a system reset
  81  *
  82  * This works through the available sysreset devices until it finds one that can
  83  * perform a reset. If the provided sysreset type is not available, the next one
  84  * will be tried.
  85  *
  86  * If this function fails to reset, it will display a message and halt
  87  *
  88  * @type:       Reset type to request
  89  * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available
  90  */
  91 int sysreset_walk(enum sysreset_t type);
  92
  93 /**
  94  * sysreset_get_last_walk() - get information on the last reset
  95  *
  96  * This works through the available sysreset devices until it finds one that can
  97  * perform a reset. If the provided sysreset type is not available, the next one
  98  * will be tried.
  99  *
 100  * If no device prives the information, this function returns -ENOENT
 101  *
 102  * @return last reset state (enum sysreset_t) or -ve error
 103  */
 104 int sysreset_get_last_walk(void);
 105
 106 /**
 107  * sysreset_walk_halt() - try to reset, otherwise halt
 108  *
 109  * This calls sysreset_walk(). If it returns, indicating that reset is not
 110  * supported, it prints a message and halts.
 111  */
 112 void sysreset_walk_halt(enum sysreset_t type);
 113
 114 /**
 115  * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
 116  */
 117 void reset_cpu(ulong addr);
 118
 119 #endif