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
ast_sysreset_request(struct udevice * dev,enum sysreset_t type)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