1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2019-2020 Linaro Limited
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun #include <common.h>
6*4882a593Smuzhiyun #include <dm.h>
7*4882a593Smuzhiyun #include <errno.h>
8*4882a593Smuzhiyun #include <reset-uclass.h>
9*4882a593Smuzhiyun #include <scmi_agent.h>
10*4882a593Smuzhiyun #include <scmi_protocols.h>
11*4882a593Smuzhiyun #include <asm/types.h>
12*4882a593Smuzhiyun
scmi_reset_set_level(struct reset_ctl * rst,bool assert_not_deassert)13*4882a593Smuzhiyun static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun struct scmi_rd_reset_in in = {
16*4882a593Smuzhiyun .domain_id = rst->id,
17*4882a593Smuzhiyun .flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
18*4882a593Smuzhiyun .reset_state = 0,
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun struct scmi_rd_reset_out out;
21*4882a593Smuzhiyun struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
22*4882a593Smuzhiyun SCMI_RESET_DOMAIN_RESET,
23*4882a593Smuzhiyun in, out);
24*4882a593Smuzhiyun int ret;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun ret = devm_scmi_process_msg(rst->dev->parent, &msg);
27*4882a593Smuzhiyun if (ret)
28*4882a593Smuzhiyun return ret;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun return scmi_to_linux_errno(out.status);
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
scmi_reset_assert(struct reset_ctl * rst)33*4882a593Smuzhiyun static int scmi_reset_assert(struct reset_ctl *rst)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun return scmi_reset_set_level(rst, true);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
scmi_reset_deassert(struct reset_ctl * rst)38*4882a593Smuzhiyun static int scmi_reset_deassert(struct reset_ctl *rst)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun return scmi_reset_set_level(rst, false);
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
scmi_reset_request(struct reset_ctl * rst)43*4882a593Smuzhiyun static int scmi_reset_request(struct reset_ctl *rst)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun struct scmi_rd_attr_in in = {
46*4882a593Smuzhiyun .domain_id = rst->id,
47*4882a593Smuzhiyun };
48*4882a593Smuzhiyun struct scmi_rd_attr_out out;
49*4882a593Smuzhiyun struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
50*4882a593Smuzhiyun SCMI_RESET_DOMAIN_ATTRIBUTES,
51*4882a593Smuzhiyun in, out);
52*4882a593Smuzhiyun int ret;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /*
55*4882a593Smuzhiyun * We don't really care about the attribute, just check
56*4882a593Smuzhiyun * the reset domain exists.
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun ret = devm_scmi_process_msg(rst->dev->parent, &msg);
59*4882a593Smuzhiyun if (ret)
60*4882a593Smuzhiyun return ret;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return scmi_to_linux_errno(out.status);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
scmi_reset_rfree(struct reset_ctl * rst)65*4882a593Smuzhiyun static int scmi_reset_rfree(struct reset_ctl *rst)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun static const struct reset_ops scmi_reset_domain_ops = {
71*4882a593Smuzhiyun .request = scmi_reset_request,
72*4882a593Smuzhiyun .rfree = scmi_reset_rfree,
73*4882a593Smuzhiyun .rst_assert = scmi_reset_assert,
74*4882a593Smuzhiyun .rst_deassert = scmi_reset_deassert,
75*4882a593Smuzhiyun };
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun U_BOOT_DRIVER(scmi_reset_domain) = {
78*4882a593Smuzhiyun .name = "scmi_reset_domain",
79*4882a593Smuzhiyun .id = UCLASS_RESET,
80*4882a593Smuzhiyun .ops = &scmi_reset_domain_ops,
81*4882a593Smuzhiyun };
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