1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (c) 2015 Google, Inc
3*4882a593Smuzhiyun * Written by Simon Glass <sjg@chromium.org>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #ifndef __SYSRESET_H
9*4882a593Smuzhiyun #define __SYSRESET_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun enum sysreset_t {
12*4882a593Smuzhiyun SYSRESET_WARM, /* Reset CPU, keep GPIOs active */
13*4882a593Smuzhiyun SYSRESET_COLD, /* Reset CPU and GPIOs */
14*4882a593Smuzhiyun SYSRESET_POWER, /* Reset PMIC (remove and restore power) */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun SYSRESET_COUNT,
17*4882a593Smuzhiyun };
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun struct sysreset_ops {
20*4882a593Smuzhiyun /**
21*4882a593Smuzhiyun * request() - request a sysreset of the given type
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * Note that this function may return before the reset takes effect.
24*4882a593Smuzhiyun *
25*4882a593Smuzhiyun * @type: Reset type to request
26*4882a593Smuzhiyun * @return -EINPROGRESS if the reset has been started and
27*4882a593Smuzhiyun * will complete soon, -EPROTONOSUPPORT if not supported
28*4882a593Smuzhiyun * by this device, 0 if the reset has already happened
29*4882a593Smuzhiyun * (in which case this method will not actually return)
30*4882a593Smuzhiyun */
31*4882a593Smuzhiyun int (*request)(struct udevice *dev, enum sysreset_t type);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /**
34*4882a593Smuzhiyun * request_by_mode() - request a sysreset of the given mode
35*4882a593Smuzhiyun *
36*4882a593Smuzhiyun * Note that this function may return before the reset takes effect.
37*4882a593Smuzhiyun *
38*4882a593Smuzhiyun * @mode: mode to request
39*4882a593Smuzhiyun * @return -EINPROGRESS if the reset has been started and
40*4882a593Smuzhiyun * will complete soon, -EPROTONOSUPPORT if not supported
41*4882a593Smuzhiyun * by this device, 0 if the reset has already happened
42*4882a593Smuzhiyun * (in which case this method will not actually return)
43*4882a593Smuzhiyun */
44*4882a593Smuzhiyun int (*request_by_mode)(struct udevice *dev, const char *mode);
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #define sysreset_get_ops(dev) ((struct sysreset_ops *)(dev)->driver->ops)
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun #ifdef CONFIG_SYSRESET
50*4882a593Smuzhiyun /**
51*4882a593Smuzhiyun * sysreset_request() - request a sysreset
52*4882a593Smuzhiyun *
53*4882a593Smuzhiyun * @type: Reset type to request
54*4882a593Smuzhiyun * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device
55*4882a593Smuzhiyun */
56*4882a593Smuzhiyun int sysreset_request(struct udevice *dev, enum sysreset_t type);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /**
59*4882a593Smuzhiyun * sysreset_walk() - cause a system reset
60*4882a593Smuzhiyun *
61*4882a593Smuzhiyun * This works through the available sysreset devices until it finds one that can
62*4882a593Smuzhiyun * perform a reset. If the provided sysreset type is not available, the next one
63*4882a593Smuzhiyun * will be tried.
64*4882a593Smuzhiyun *
65*4882a593Smuzhiyun * If this function fails to reset, it will display a message and halt
66*4882a593Smuzhiyun *
67*4882a593Smuzhiyun * @type: Reset type to request
68*4882a593Smuzhiyun * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available
69*4882a593Smuzhiyun */
70*4882a593Smuzhiyun int sysreset_walk(enum sysreset_t type);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /**
73*4882a593Smuzhiyun * sysreset_walk_halt() - try to reset, otherwise halt
74*4882a593Smuzhiyun *
75*4882a593Smuzhiyun * This calls sysreset_walk(). If it returns, indicating that reset is not
76*4882a593Smuzhiyun * supported, it prints a message and halts.
77*4882a593Smuzhiyun */
78*4882a593Smuzhiyun void sysreset_walk_halt(enum sysreset_t type);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun /**
81*4882a593Smuzhiyun * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
82*4882a593Smuzhiyun */
83*4882a593Smuzhiyun void reset_cpu(ulong addr);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun /**
86*4882a593Smuzhiyun * reboot() - calls sysreset_walk(SYSRESET_WARM)
87*4882a593Smuzhiyun *
88*4882a593Smuzhiyun * Support the command like: reboot loader/bootloader/recovery, etc.
89*4882a593Smuzhiyun */
90*4882a593Smuzhiyun void reboot(const char *mode);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun #else
93*4882a593Smuzhiyun #include <asm/io.h>
94*4882a593Smuzhiyun
reset_cpu(ulong addr)95*4882a593Smuzhiyun inline void reset_cpu(ulong addr)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun writel(CONFIG_SYSRESET_VAL, CONFIG_SYSRESET_REG);
98*4882a593Smuzhiyun dsb();
99*4882a593Smuzhiyun isb();
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun while (1)
102*4882a593Smuzhiyun ;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun #endif
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun #endif
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