1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Derived from linux/drivers/power/reset/syscon-reboot.c:
5*4882a593Smuzhiyun * Copyright (C) 2013, Applied Micro Circuits Corporation
6*4882a593Smuzhiyun * Author: Feng Kan <fkan@apm.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <common.h>
12*4882a593Smuzhiyun #include <dm.h>
13*4882a593Smuzhiyun #include <errno.h>
14*4882a593Smuzhiyun #include <regmap.h>
15*4882a593Smuzhiyun #include <sysreset.h>
16*4882a593Smuzhiyun #include <syscon.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun struct syscon_reboot_priv {
21*4882a593Smuzhiyun struct regmap *regmap;
22*4882a593Smuzhiyun unsigned int offset;
23*4882a593Smuzhiyun unsigned int mask;
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
syscon_reboot_request(struct udevice * dev,enum sysreset_t type)26*4882a593Smuzhiyun static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct syscon_reboot_priv *priv = dev_get_priv(dev);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun regmap_write(priv->regmap, priv->offset, priv->mask);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return -EINPROGRESS;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun static struct sysreset_ops syscon_reboot_ops = {
36*4882a593Smuzhiyun .request = syscon_reboot_request,
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
syscon_reboot_probe(struct udevice * dev)39*4882a593Smuzhiyun int syscon_reboot_probe(struct udevice *dev)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun struct udevice *syscon;
42*4882a593Smuzhiyun struct syscon_reboot_priv *priv = dev_get_priv(dev);
43*4882a593Smuzhiyun int err;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
46*4882a593Smuzhiyun "regmap", &syscon);
47*4882a593Smuzhiyun if (err) {
48*4882a593Smuzhiyun pr_err("unable to find syscon device\n");
49*4882a593Smuzhiyun return err;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun priv->regmap = syscon_get_regmap(syscon);
53*4882a593Smuzhiyun if (!priv->regmap) {
54*4882a593Smuzhiyun pr_err("unable to find regmap\n");
55*4882a593Smuzhiyun return -ENODEV;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun priv->offset = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
59*4882a593Smuzhiyun "offset", 0);
60*4882a593Smuzhiyun priv->mask = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
61*4882a593Smuzhiyun "mask", 0);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun return 0;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static const struct udevice_id syscon_reboot_ids[] = {
67*4882a593Smuzhiyun { .compatible = "syscon-reboot" },
68*4882a593Smuzhiyun { /* sentinel */ }
69*4882a593Smuzhiyun };
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun U_BOOT_DRIVER(syscon_reboot) = {
72*4882a593Smuzhiyun .name = "syscon_reboot",
73*4882a593Smuzhiyun .id = UCLASS_SYSRESET,
74*4882a593Smuzhiyun .of_match = syscon_reboot_ids,
75*4882a593Smuzhiyun .probe = syscon_reboot_probe,
76*4882a593Smuzhiyun .priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
77*4882a593Smuzhiyun .ops = &syscon_reboot_ops,
78*4882a593Smuzhiyun };
79