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 #include <common.h> 9 #include <sysreset.h> 10 #include <dm.h> 11 #include <errno.h> 12 #include <regmap.h> 13 #include <dm/device-internal.h> 14 #include <dm/lists.h> 15 #include <dm/root.h> 16 #include <linux/err.h> 17 18 int sysreset_request(struct udevice *dev, enum sysreset_t type) 19 { 20 struct sysreset_ops *ops = sysreset_get_ops(dev); 21 22 if (!ops->request) 23 return -ENOSYS; 24 25 return ops->request(dev, type); 26 } 27 28 int sysreset_walk(enum sysreset_t type) 29 { 30 struct udevice *dev; 31 int ret = -ENOSYS; 32 33 /* 34 * Use psci sysreset as primary for rockchip platforms, 35 * "rockchip_reset" is applied if PSCI is disabled. 36 */ 37 #if !defined(CONFIG_TPL_BUILD) && \ 38 defined(CONFIG_ARCH_ROCKCHIP) && defined(CONFIG_SYSRESET_PSCI) 39 ret = uclass_get_device_by_driver(UCLASS_SYSRESET, 40 DM_GET_DRIVER(psci_sysreset), &dev); 41 if (!ret) 42 sysreset_request(dev, type); 43 else 44 printf("WARN: PSCI sysreset is disabled\n"); 45 #endif 46 47 while (ret != -EINPROGRESS && type < SYSRESET_COUNT) { 48 for (uclass_first_device(UCLASS_SYSRESET, &dev); 49 dev; 50 uclass_next_device(&dev)) { 51 ret = sysreset_request(dev, type); 52 if (ret == -EINPROGRESS) 53 break; 54 } 55 type++; 56 } 57 58 return ret; 59 } 60 61 void sysreset_walk_halt(enum sysreset_t type) 62 { 63 int ret; 64 65 ret = sysreset_walk(type); 66 67 /* Wait for the reset to take effect */ 68 if (ret == -EINPROGRESS) 69 mdelay(100); 70 71 /* Still no reset? Give up */ 72 debug("System reset not supported on this platform\n"); 73 hang(); 74 } 75 76 /** 77 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM) 78 */ 79 void reset_cpu(ulong addr) 80 { 81 sysreset_walk_halt(SYSRESET_WARM); 82 } 83 84 85 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 86 { 87 sysreset_walk_halt(SYSRESET_COLD); 88 89 return 0; 90 } 91 92 UCLASS_DRIVER(sysreset) = { 93 .id = UCLASS_SYSRESET, 94 .name = "sysreset", 95 }; 96