1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "dc.h"
27 #include "dc_dmub_srv.h"
28 #include "../dmub/dmub_srv.h"
29 
30 static void dc_dmub_srv_construct(struct dc_dmub_srv *dc_srv, struct dc *dc,
31 				  struct dmub_srv *dmub)
32 {
33 	dc_srv->dmub = dmub;
34 	dc_srv->ctx = dc->ctx;
35 }
36 
37 struct dc_dmub_srv *dc_dmub_srv_create(struct dc *dc, struct dmub_srv *dmub)
38 {
39 	struct dc_dmub_srv *dc_srv =
40 		kzalloc(sizeof(struct dc_dmub_srv), GFP_KERNEL);
41 
42 	if (dc_srv == NULL) {
43 		BREAK_TO_DEBUGGER();
44 		return NULL;
45 	}
46 
47 	dc_dmub_srv_construct(dc_srv, dc, dmub);
48 
49 	return dc_srv;
50 }
51 
52 void dc_dmub_srv_destroy(struct dc_dmub_srv **dmub_srv)
53 {
54 	if (*dmub_srv) {
55 		kfree(*dmub_srv);
56 		*dmub_srv = NULL;
57 	}
58 }
59 
60 void dc_dmub_srv_cmd_queue(struct dc_dmub_srv *dc_dmub_srv,
61 			   union dmub_rb_cmd *cmd)
62 {
63 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
64 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
65 	enum dmub_status status;
66 
67 	status = dmub_srv_cmd_queue(dmub, cmd);
68 	if (status == DMUB_STATUS_OK)
69 		return;
70 
71 	if (status != DMUB_STATUS_QUEUE_FULL)
72 		goto error;
73 
74 	/* Execute and wait for queue to become empty again. */
75 	dc_dmub_srv_cmd_execute(dc_dmub_srv);
76 	dc_dmub_srv_wait_idle(dc_dmub_srv);
77 
78 	/* Requeue the command. */
79 	status = dmub_srv_cmd_queue(dmub, cmd);
80 	if (status == DMUB_STATUS_OK)
81 		return;
82 
83 error:
84 	DC_ERROR("Error queuing DMUB command: status=%d\n", status);
85 }
86 
87 void dc_dmub_srv_cmd_execute(struct dc_dmub_srv *dc_dmub_srv)
88 {
89 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
90 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
91 	enum dmub_status status;
92 
93 	status = dmub_srv_cmd_execute(dmub);
94 	if (status != DMUB_STATUS_OK)
95 		DC_ERROR("Error starting DMUB execution: status=%d\n", status);
96 }
97 
98 void dc_dmub_srv_wait_idle(struct dc_dmub_srv *dc_dmub_srv)
99 {
100 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
101 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
102 	enum dmub_status status;
103 
104 	status = dmub_srv_wait_for_idle(dmub, 100000);
105 	if (status != DMUB_STATUS_OK)
106 		DC_ERROR("Error waiting for DMUB idle: status=%d\n", status);
107 }
108 
109 void dc_dmub_srv_wait_phy_init(struct dc_dmub_srv *dc_dmub_srv)
110 {
111 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
112 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
113 	enum dmub_status status;
114 
115 	for (;;) {
116 		/* Wait up to a second for PHY init. */
117 		status = dmub_srv_wait_for_phy_init(dmub, 1000000);
118 		if (status == DMUB_STATUS_OK)
119 			/* Initialization OK */
120 			break;
121 
122 		DC_ERROR("DMCUB PHY init failed: status=%d\n", status);
123 		ASSERT(0);
124 
125 		if (status != DMUB_STATUS_TIMEOUT)
126 			/*
127 			 * Server likely initialized or we don't have
128 			 * DMCUB HW support - this won't end.
129 			 */
130 			break;
131 
132 		/* Continue spinning so we don't hang the ASIC. */
133 	}
134 }
135