1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2016 NVIDIA Corporation
4 */
5
6#include <linux/reset-controller.h>
7
8#include <soc/tegra/bpmp.h>
9#include <soc/tegra/bpmp-abi.h>
10
11static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
12{
13	return container_of(rstc, struct tegra_bpmp, rstc);
14}
15
16static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
17				   enum mrq_reset_commands command,
18				   unsigned int id)
19{
20	struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
21	struct mrq_reset_request request;
22	struct tegra_bpmp_message msg;
23	int err;
24
25	memset(&request, 0, sizeof(request));
26	request.cmd = command;
27	request.reset_id = id;
28
29	memset(&msg, 0, sizeof(msg));
30	msg.mrq = MRQ_RESET;
31	msg.tx.data = &request;
32	msg.tx.size = sizeof(request);
33
34	err = tegra_bpmp_transfer(bpmp, &msg);
35	if (err)
36		return err;
37	if (msg.rx.ret)
38		return -EINVAL;
39
40	return 0;
41}
42
43static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
44				   unsigned long id)
45{
46	return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
47}
48
49static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
50				   unsigned long id)
51{
52	return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
53}
54
55static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
56				     unsigned long id)
57{
58	return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
59}
60
61static const struct reset_control_ops tegra_bpmp_reset_ops = {
62	.reset = tegra_bpmp_reset_module,
63	.assert = tegra_bpmp_reset_assert,
64	.deassert = tegra_bpmp_reset_deassert,
65};
66
67int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
68{
69	bpmp->rstc.ops = &tegra_bpmp_reset_ops;
70	bpmp->rstc.owner = THIS_MODULE;
71	bpmp->rstc.of_node = bpmp->dev->of_node;
72	bpmp->rstc.nr_resets = bpmp->soc->num_resets;
73
74	return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
75}
76