1 /* 2 * Copyright (c) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #ifndef __RESET_H 9 #define __RESET_H 10 11 enum reset_t { 12 RESET_WARM, /* Reset CPU, keep GPIOs active */ 13 RESET_COLD, /* Reset CPU and GPIOs */ 14 RESET_POWER, /* Reset PMIC (remove and restore power) */ 15 16 RESET_COUNT, 17 }; 18 19 struct reset_ops { 20 /** 21 * request() - request a reset 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 reset_t type); 32 }; 33 34 #define reset_get_ops(dev) ((struct reset_ops *)(dev)->driver->ops) 35 36 /** 37 * reset_request() - request a reset 38 * 39 * @type: Reset type to request 40 * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device 41 */ 42 int reset_request(struct udevice *dev, enum reset_t type); 43 44 /** 45 * reset_walk() - cause a reset 46 * 47 * This works through the available reset devices until it finds one that can 48 * perform a reset. If the provided reset type is not available, the next one 49 * will be tried. 50 * 51 * If this function fails to reset, it will display a message and halt 52 * 53 * @type: Reset type to request 54 * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available 55 */ 56 int reset_walk(enum reset_t type); 57 58 /** 59 * reset_walk_halt() - try to reset, otherwise halt 60 * 61 * This calls reset_walk(). If it returns, indicating that reset is not 62 * supported, it prints a message and halts. 63 */ 64 void reset_walk_halt(enum reset_t type); 65 66 /** 67 * reset_cpu() - calls reset_walk(RESET_WARM) 68 */ 69 void reset_cpu(ulong addr); 70 71 #endif 72