1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2017 Patrice Chotard <patrice.chotard@st.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <common.h>
8*4882a593Smuzhiyun #include <dm.h>
9*4882a593Smuzhiyun #include <regmap.h>
10*4882a593Smuzhiyun #include <syscon.h>
11*4882a593Smuzhiyun #include <sysreset.h>
12*4882a593Smuzhiyun #include <asm/io.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun struct sti_sysreset_priv {
17*4882a593Smuzhiyun phys_addr_t base;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
sti_sysreset_request(struct udevice * dev,enum sysreset_t type)20*4882a593Smuzhiyun static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct sti_sysreset_priv *priv = dev_get_priv(dev);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun generic_clear_bit(0, (void __iomem *)priv->base);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun return -EINPROGRESS;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
sti_sysreset_probe(struct udevice * dev)29*4882a593Smuzhiyun static int sti_sysreset_probe(struct udevice *dev)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun struct sti_sysreset_priv *priv = dev_get_priv(dev);
32*4882a593Smuzhiyun struct udevice *syscon;
33*4882a593Smuzhiyun struct regmap *regmap;
34*4882a593Smuzhiyun struct fdtdec_phandle_args syscfg_phandle;
35*4882a593Smuzhiyun int ret;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun /* get corresponding syscon phandle */
38*4882a593Smuzhiyun ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
39*4882a593Smuzhiyun "st,syscfg", NULL, 0, 0,
40*4882a593Smuzhiyun &syscfg_phandle);
41*4882a593Smuzhiyun if (ret < 0) {
42*4882a593Smuzhiyun pr_err("Can't get syscfg phandle: %d\n", ret);
43*4882a593Smuzhiyun return ret;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun ret = uclass_get_device_by_of_offset(UCLASS_SYSCON,
47*4882a593Smuzhiyun syscfg_phandle.node,
48*4882a593Smuzhiyun &syscon);
49*4882a593Smuzhiyun if (ret) {
50*4882a593Smuzhiyun pr_err("%s: uclass_get_device_by_of_offset failed: %d\n",
51*4882a593Smuzhiyun __func__, ret);
52*4882a593Smuzhiyun return ret;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun regmap = syscon_get_regmap(syscon);
56*4882a593Smuzhiyun if (!regmap) {
57*4882a593Smuzhiyun pr_err("unable to get regmap for %s\n", syscon->name);
58*4882a593Smuzhiyun return -ENODEV;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun priv->base = regmap->base;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun return 0;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static struct sysreset_ops sti_sysreset = {
67*4882a593Smuzhiyun .request = sti_sysreset_request,
68*4882a593Smuzhiyun };
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun static const struct udevice_id sti_sysreset_ids[] = {
71*4882a593Smuzhiyun { .compatible = "st,stih407-restart" },
72*4882a593Smuzhiyun { }
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun U_BOOT_DRIVER(sysreset_sti) = {
76*4882a593Smuzhiyun .name = "sysreset_sti",
77*4882a593Smuzhiyun .id = UCLASS_SYSRESET,
78*4882a593Smuzhiyun .ops = &sti_sysreset,
79*4882a593Smuzhiyun .probe = sti_sysreset_probe,
80*4882a593Smuzhiyun .of_match = sti_sysreset_ids,
81*4882a593Smuzhiyun .priv_auto_alloc_size = sizeof(struct sti_sysreset_priv),
82*4882a593Smuzhiyun };
83