1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * (C) Copyright 2016 Google, Inc
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <errno.h>
9 #include <sysreset.h>
10 #include <wdt.h>
11 #include <asm/io.h>
12 #include <asm/arch/wdt.h>
13 #include <linux/err.h>
14 
15 static int ast_sysreset_request(struct udevice *dev, enum sysreset_t type)
16 {
17 	struct udevice *wdt;
18 	u32 reset_mode;
19 	int ret = uclass_first_device(UCLASS_WDT, &wdt);
20 
21 	if (ret)
22 		return ret;
23 
24 	switch (type) {
25 	case SYSRESET_WARM:
26 		reset_mode = WDT_CTRL_RESET_CPU;
27 		break;
28 	case SYSRESET_COLD:
29 		reset_mode = WDT_CTRL_RESET_CHIP;
30 		break;
31 	default:
32 		return -EPROTONOSUPPORT;
33 	}
34 
35 	ret = wdt_expire_now(wdt, reset_mode);
36 	if (ret) {
37 		debug("Sysreset failed: %d", ret);
38 		return ret;
39 	}
40 
41 	return -EINPROGRESS;
42 }
43 
44 static struct sysreset_ops ast_sysreset = {
45 	.request	= ast_sysreset_request,
46 };
47 
48 U_BOOT_DRIVER(sysreset_ast) = {
49 	.name	= "ast_sysreset",
50 	.id	= UCLASS_SYSRESET,
51 	.ops	= &ast_sysreset,
52 };
53