Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Stephen Warren | 859f256 | 2016-05-12 12:03:35 -0600 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2015 Google, Inc |
| 4 | * Written by Simon Glass <sjg@chromium.org> |
Stephen Warren | 859f256 | 2016-05-12 12:03:35 -0600 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <sysreset.h> |
| 9 | #include <dm.h> |
| 10 | #include <errno.h> |
| 11 | #include <regmap.h> |
| 12 | #include <dm/device-internal.h> |
| 13 | #include <dm/lists.h> |
| 14 | #include <dm/root.h> |
| 15 | #include <linux/err.h> |
| 16 | |
| 17 | int sysreset_request(struct udevice *dev, enum sysreset_t type) |
| 18 | { |
| 19 | struct sysreset_ops *ops = sysreset_get_ops(dev); |
| 20 | |
| 21 | if (!ops->request) |
| 22 | return -ENOSYS; |
| 23 | |
| 24 | return ops->request(dev, type); |
| 25 | } |
| 26 | |
| 27 | int sysreset_walk(enum sysreset_t type) |
| 28 | { |
| 29 | struct udevice *dev; |
| 30 | int ret = -ENOSYS; |
| 31 | |
| 32 | while (ret != -EINPROGRESS && type < SYSRESET_COUNT) { |
| 33 | for (uclass_first_device(UCLASS_SYSRESET, &dev); |
| 34 | dev; |
| 35 | uclass_next_device(&dev)) { |
| 36 | ret = sysreset_request(dev, type); |
| 37 | if (ret == -EINPROGRESS) |
| 38 | break; |
| 39 | } |
| 40 | type++; |
| 41 | } |
| 42 | |
| 43 | return ret; |
| 44 | } |
| 45 | |
| 46 | void sysreset_walk_halt(enum sysreset_t type) |
| 47 | { |
| 48 | int ret; |
| 49 | |
| 50 | ret = sysreset_walk(type); |
| 51 | |
| 52 | /* Wait for the reset to take effect */ |
| 53 | if (ret == -EINPROGRESS) |
| 54 | mdelay(100); |
| 55 | |
| 56 | /* Still no reset? Give up */ |
Simon Glass | a8c5ac0 | 2016-05-14 14:02:54 -0600 | [diff] [blame] | 57 | debug("System reset not supported on this platform\n"); |
Stephen Warren | 859f256 | 2016-05-12 12:03:35 -0600 | [diff] [blame] | 58 | hang(); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * reset_cpu() - calls sysreset_walk(SYSRESET_WARM) |
| 63 | */ |
| 64 | void reset_cpu(ulong addr) |
| 65 | { |
| 66 | sysreset_walk_halt(SYSRESET_WARM); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
| 71 | { |
Philipp Tomsich | 8caba82 | 2017-11-24 18:37:58 +0100 | [diff] [blame] | 72 | sysreset_walk_halt(SYSRESET_COLD); |
Stephen Warren | 859f256 | 2016-05-12 12:03:35 -0600 | [diff] [blame] | 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | UCLASS_DRIVER(sysreset) = { |
| 78 | .id = UCLASS_SYSRESET, |
| 79 | .name = "sysreset", |
| 80 | }; |