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: &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, command: 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, command: 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, command: 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(dev: bpmp->dev, rcdev: &bpmp->rstc);
75}
76

source code of linux/drivers/reset/tegra/reset-bpmp.c