xref: /openbmc/linux/drivers/reset/tegra/reset-bpmp.c (revision 4426116b)
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 
to_tegra_bpmp(struct reset_controller_dev * rstc)11 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
12 {
13 	return container_of(rstc, struct tegra_bpmp, rstc);
14 }
15 
tegra_bpmp_reset_common(struct reset_controller_dev * rstc,enum mrq_reset_commands command,unsigned int id)16 static 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 
tegra_bpmp_reset_module(struct reset_controller_dev * rstc,unsigned long id)43 static 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 
tegra_bpmp_reset_assert(struct reset_controller_dev * rstc,unsigned long id)49 static 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 
tegra_bpmp_reset_deassert(struct reset_controller_dev * rstc,unsigned long id)55 static 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 
61 static 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 
tegra_bpmp_init_resets(struct tegra_bpmp * bpmp)67 int 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