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 __SYSRESET_H 9 #define __SYSRESET_H 10 11 enum sysreset_t { 12 SYSRESET_WARM, /* Reset CPU, keep GPIOs active */ 13 SYSRESET_COLD, /* Reset CPU and GPIOs */ 14 SYSRESET_POWER, /* Reset PMIC (remove and restore 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 /** 34 * request_by_mode() - request a sysreset of the given mode 35 * 36 * Note that this function may return before the reset takes effect. 37 * 38 * @mode: mode to request 39 * @return -EINPROGRESS if the reset has been started and 40 * will complete soon, -EPROTONOSUPPORT if not supported 41 * by this device, 0 if the reset has already happened 42 * (in which case this method will not actually return) 43 */ 44 int (*request_by_mode)(struct udevice *dev, const char *mode); 45 }; 46 47 #define sysreset_get_ops(dev) ((struct sysreset_ops *)(dev)->driver->ops) 48 49 #ifdef CONFIG_SYSRESET 50 /** 51 * sysreset_request() - request a sysreset 52 * 53 * @type: Reset type to request 54 * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device 55 */ 56 int sysreset_request(struct udevice *dev, enum sysreset_t type); 57 58 /** 59 * sysreset_walk() - cause a system reset 60 * 61 * This works through the available sysreset devices until it finds one that can 62 * perform a reset. If the provided sysreset type is not available, the next one 63 * will be tried. 64 * 65 * If this function fails to reset, it will display a message and halt 66 * 67 * @type: Reset type to request 68 * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available 69 */ 70 int sysreset_walk(enum sysreset_t type); 71 72 /** 73 * sysreset_walk_halt() - try to reset, otherwise halt 74 * 75 * This calls sysreset_walk(). If it returns, indicating that reset is not 76 * supported, it prints a message and halts. 77 */ 78 void sysreset_walk_halt(enum sysreset_t type); 79 80 /** 81 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM) 82 */ 83 void reset_cpu(ulong addr); 84 85 /** 86 * reboot() - calls sysreset_walk(SYSRESET_WARM) 87 * 88 * Support the command like: reboot loader/bootloader/recovery, etc. 89 */ 90 void reboot(const char *mode); 91 92 #else 93 #include <asm/io.h> 94 95 inline void reset_cpu(ulong addr) 96 { 97 writel(CONFIG_SYSRESET_VAL, CONFIG_SYSRESET_REG); 98 dsb(); 99 isb(); 100 101 while (1) 102 ; 103 } 104 #endif 105 106 #endif 107