1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2019-2022 Linaro Limited
4 */
5
6#define LOG_CATEGORY UCLASS_RESET
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
11#include <reset-uclass.h>
12#include <scmi_agent.h>
13#include <scmi_protocols.h>
14#include <asm/types.h>
15
16static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
17{
18	struct scmi_rd_reset_in in = {
19		.domain_id = rst->id,
20		.flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
21		.reset_state = 0,
22	};
23	struct scmi_rd_reset_out out;
24	struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
25					  SCMI_RESET_DOMAIN_RESET,
26					  in, out);
27	int ret;
28
29	ret = devm_scmi_process_msg(rst->dev, &msg);
30	if (ret)
31		return ret;
32
33	return scmi_to_linux_errno(out.status);
34}
35
36static int scmi_reset_assert(struct reset_ctl *rst)
37{
38	return scmi_reset_set_level(rst, true);
39}
40
41static int scmi_reset_deassert(struct reset_ctl *rst)
42{
43	return scmi_reset_set_level(rst, false);
44}
45
46static int scmi_reset_request(struct reset_ctl *rst)
47{
48	struct scmi_rd_attr_in in = {
49		.domain_id = rst->id,
50	};
51	struct scmi_rd_attr_out out;
52	struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
53					  SCMI_RESET_DOMAIN_ATTRIBUTES,
54					  in, out);
55	int ret;
56
57	/*
58	 * We don't really care about the attribute, just check
59	 * the reset domain exists.
60	 */
61	ret = devm_scmi_process_msg(rst->dev, &msg);
62	if (ret)
63		return ret;
64
65	return scmi_to_linux_errno(out.status);
66}
67
68static const struct reset_ops scmi_reset_domain_ops = {
69	.request	= scmi_reset_request,
70	.rst_assert	= scmi_reset_assert,
71	.rst_deassert	= scmi_reset_deassert,
72};
73
74static int scmi_reset_probe(struct udevice *dev)
75{
76	return devm_scmi_of_get_channel(dev);
77}
78
79U_BOOT_DRIVER(scmi_reset_domain) = {
80	.name = "scmi_reset_domain",
81	.id = UCLASS_RESET,
82	.ops = &scmi_reset_domain_ops,
83	.probe = scmi_reset_probe,
84};
85