1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (c) 2015 Google, Inc 4 * Written by Simon Glass <sjg (at) 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 15 SYSRESET_COUNT, 16 }; 17 18 struct sysreset_ops { 19 /** 20 * request() - request a sysreset of the given type 21 * 22 * Note that this function may return before the reset takes effect. 23 * 24 * @type: Reset type to request 25 * @return -EINPROGRESS if the reset has been started and 26 * will complete soon, -EPROTONOSUPPORT if not supported 27 * by this device, 0 if the reset has already happened 28 * (in which case this method will not actually return) 29 */ 30 int (*request)(struct udevice *dev, enum sysreset_t type); 31 }; 32 33 #define sysreset_get_ops(dev) ((struct sysreset_ops *)(dev)->driver->ops) 34 35 /** 36 * sysreset_request() - request a sysreset 37 * 38 * @type: Reset type to request 39 * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device 40 */ 41 int sysreset_request(struct udevice *dev, enum sysreset_t type); 42 43 /** 44 * sysreset_walk() - cause a system reset 45 * 46 * This works through the available sysreset devices until it finds one that can 47 * perform a reset. If the provided sysreset type is not available, the next one 48 * will be tried. 49 * 50 * If this function fails to reset, it will display a message and halt 51 * 52 * @type: Reset type to request 53 * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available 54 */ 55 int sysreset_walk(enum sysreset_t type); 56 57 /** 58 * sysreset_walk_halt() - try to reset, otherwise halt 59 * 60 * This calls sysreset_walk(). If it returns, indicating that reset is not 61 * supported, it prints a message and halts. 62 */ 63 void sysreset_walk_halt(enum sysreset_t type); 64 65 /** 66 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM) 67 */ 68 void reset_cpu(ulong addr); 69 70 #endif 71
