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Patrice Chotard413788c2017-02-21 13:37:06 +01001/*
Patrice Chotardfb48bc42017-10-23 09:53:57 +02002 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
Patrice Chotard413788c2017-02-21 13:37:06 +01004 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <regmap.h>
11#include <syscon.h>
12#include <sysreset.h>
13#include <asm/io.h>
14
15DECLARE_GLOBAL_DATA_PTR;
16
17struct sti_sysreset_priv {
18 phys_addr_t base;
19};
20
21static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type)
22{
23 struct sti_sysreset_priv *priv = dev_get_priv(dev);
24
25 generic_clear_bit(0, (void __iomem *)priv->base);
26
27 return -EINPROGRESS;
28}
29
30static int sti_sysreset_probe(struct udevice *dev)
31{
32 struct sti_sysreset_priv *priv = dev_get_priv(dev);
33 struct udevice *syscon;
34 struct regmap *regmap;
35 struct fdtdec_phandle_args syscfg_phandle;
36 int ret;
37
38 /* get corresponding syscon phandle */
39 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
40 "st,syscfg", NULL, 0, 0,
41 &syscfg_phandle);
42 if (ret < 0) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090043 pr_err("Can't get syscfg phandle: %d\n", ret);
Patrice Chotard413788c2017-02-21 13:37:06 +010044 return ret;
45 }
46
47 ret = uclass_get_device_by_of_offset(UCLASS_SYSCON,
48 syscfg_phandle.node,
49 &syscon);
50 if (ret) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090051 pr_err("%s: uclass_get_device_by_of_offset failed: %d\n",
Patrice Chotard413788c2017-02-21 13:37:06 +010052 __func__, ret);
53 return ret;
54 }
55
56 regmap = syscon_get_regmap(syscon);
57 if (!regmap) {
Masahiro Yamada9b643e32017-09-16 14:10:41 +090058 pr_err("unable to get regmap for %s\n", syscon->name);
Patrice Chotard413788c2017-02-21 13:37:06 +010059 return -ENODEV;
60 }
61
62 priv->base = regmap->base;
63
64 return 0;
65}
66
67static struct sysreset_ops sti_sysreset = {
68 .request = sti_sysreset_request,
69};
70
71static const struct udevice_id sti_sysreset_ids[] = {
72 { .compatible = "st,stih407-restart" },
73 { }
74};
75
76U_BOOT_DRIVER(sysreset_sti) = {
77 .name = "sysreset_sti",
78 .id = UCLASS_SYSRESET,
79 .ops = &sti_sysreset,
80 .probe = sti_sysreset_probe,
81 .of_match = sti_sysreset_ids,
82 .priv_auto_alloc_size = sizeof(struct sti_sysreset_priv),
83};