1 /*
2  * Copyright 2013 Red Hat 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: Ben Skeggs
23  */
24 #include "priv.h"
25 
26 #include <core/msgqueue.h>
27 #include <subdev/timer.h>
28 
29 bool
30 nvkm_pmu_fan_controlled(struct nvkm_device *device)
31 {
32 	struct nvkm_pmu *pmu = device->pmu;
33 
34 	/* Internal PMU FW does not currently control fans in any way,
35 	 * allow SW control of fans instead.
36 	 */
37 	if (pmu && pmu->func->code.size)
38 		return false;
39 
40 	/* Default (board-loaded, or VBIOS PMU/PREOS) PMU FW on Fermi
41 	 * and newer automatically control the fan speed, which would
42 	 * interfere with SW control.
43 	 */
44 	return (device->chipset >= 0xc0);
45 }
46 
47 void
48 nvkm_pmu_pgob(struct nvkm_pmu *pmu, bool enable)
49 {
50 	if (pmu && pmu->func->pgob)
51 		pmu->func->pgob(pmu, enable);
52 }
53 
54 static void
55 nvkm_pmu_recv(struct work_struct *work)
56 {
57 	struct nvkm_pmu *pmu = container_of(work, typeof(*pmu), recv.work);
58 	return pmu->func->recv(pmu);
59 }
60 
61 int
62 nvkm_pmu_send(struct nvkm_pmu *pmu, u32 reply[2],
63 	      u32 process, u32 message, u32 data0, u32 data1)
64 {
65 	if (!pmu || !pmu->func->send)
66 		return -ENODEV;
67 	return pmu->func->send(pmu, reply, process, message, data0, data1);
68 }
69 
70 static void
71 nvkm_pmu_intr(struct nvkm_subdev *subdev)
72 {
73 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
74 	if (!pmu->func->intr)
75 		return;
76 	pmu->func->intr(pmu);
77 }
78 
79 static int
80 nvkm_pmu_fini(struct nvkm_subdev *subdev, bool suspend)
81 {
82 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
83 
84 	if (pmu->func->fini)
85 		pmu->func->fini(pmu);
86 
87 	flush_work(&pmu->recv.work);
88 	return 0;
89 }
90 
91 static int
92 nvkm_pmu_reset(struct nvkm_pmu *pmu)
93 {
94 	struct nvkm_device *device = pmu->subdev.device;
95 
96 	if (!pmu->func->enabled(pmu))
97 		return 0;
98 
99 	/* Inhibit interrupts, and wait for idle. */
100 	nvkm_wr32(device, 0x10a014, 0x0000ffff);
101 	nvkm_msec(device, 2000,
102 		if (!nvkm_rd32(device, 0x10a04c))
103 			break;
104 	);
105 
106 	/* Reset. */
107 	if (pmu->func->reset)
108 		pmu->func->reset(pmu);
109 
110 	/* Wait for IMEM/DMEM scrubbing to be complete. */
111 	nvkm_msec(device, 2000,
112 		if (!(nvkm_rd32(device, 0x10a10c) & 0x00000006))
113 			break;
114 	);
115 
116 	return 0;
117 }
118 
119 static int
120 nvkm_pmu_preinit(struct nvkm_subdev *subdev)
121 {
122 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
123 	return nvkm_pmu_reset(pmu);
124 }
125 
126 static int
127 nvkm_pmu_init(struct nvkm_subdev *subdev)
128 {
129 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
130 	int ret = nvkm_pmu_reset(pmu);
131 	if (ret == 0 && pmu->func->init)
132 		ret = pmu->func->init(pmu);
133 	return ret;
134 }
135 
136 static int
137 nvkm_pmu_oneinit(struct nvkm_subdev *subdev)
138 {
139 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
140 	return nvkm_falcon_v1_new(&pmu->subdev, "PMU", 0x10a000, &pmu->falcon);
141 }
142 
143 static void *
144 nvkm_pmu_dtor(struct nvkm_subdev *subdev)
145 {
146 	struct nvkm_pmu *pmu = nvkm_pmu(subdev);
147 	nvkm_msgqueue_del(&pmu->queue);
148 	nvkm_falcon_del(&pmu->falcon);
149 	return nvkm_pmu(subdev);
150 }
151 
152 static const struct nvkm_subdev_func
153 nvkm_pmu = {
154 	.dtor = nvkm_pmu_dtor,
155 	.preinit = nvkm_pmu_preinit,
156 	.oneinit = nvkm_pmu_oneinit,
157 	.init = nvkm_pmu_init,
158 	.fini = nvkm_pmu_fini,
159 	.intr = nvkm_pmu_intr,
160 };
161 
162 int
163 nvkm_pmu_ctor(const struct nvkm_pmu_func *func, struct nvkm_device *device,
164 	      int index, struct nvkm_pmu *pmu)
165 {
166 	nvkm_subdev_ctor(&nvkm_pmu, device, index, &pmu->subdev);
167 	pmu->func = func;
168 	INIT_WORK(&pmu->recv.work, nvkm_pmu_recv);
169 	init_waitqueue_head(&pmu->recv.wait);
170 	return 0;
171 }
172 
173 int
174 nvkm_pmu_new_(const struct nvkm_pmu_func *func, struct nvkm_device *device,
175 	      int index, struct nvkm_pmu **ppmu)
176 {
177 	struct nvkm_pmu *pmu;
178 	if (!(pmu = *ppmu = kzalloc(sizeof(*pmu), GFP_KERNEL)))
179 		return -ENOMEM;
180 	return nvkm_pmu_ctor(func, device, index, *ppmu);
181 }
182