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 #include "fuc/gt215.fuc3.h"
26 
27 #include <subdev/timer.h>
28 
29 int
30 gt215_pmu_send(struct nvkm_pmu *pmu, u32 reply[2],
31 	       u32 process, u32 message, u32 data0, u32 data1)
32 {
33 	struct nvkm_subdev *subdev = &pmu->subdev;
34 	struct nvkm_device *device = subdev->device;
35 	u32 addr;
36 
37 	mutex_lock(&subdev->mutex);
38 	/* wait for a free slot in the fifo */
39 	addr  = nvkm_rd32(device, 0x10a4a0);
40 	if (nvkm_msec(device, 2000,
41 		u32 tmp = nvkm_rd32(device, 0x10a4b0);
42 		if (tmp != (addr ^ 8))
43 			break;
44 	) < 0) {
45 		mutex_unlock(&subdev->mutex);
46 		return -EBUSY;
47 	}
48 
49 	/* we currently only support a single process at a time waiting
50 	 * on a synchronous reply, take the PMU mutex and tell the
51 	 * receive handler what we're waiting for
52 	 */
53 	if (reply) {
54 		pmu->recv.message = message;
55 		pmu->recv.process = process;
56 	}
57 
58 	/* acquire data segment access */
59 	do {
60 		nvkm_wr32(device, 0x10a580, 0x00000001);
61 	} while (nvkm_rd32(device, 0x10a580) != 0x00000001);
62 
63 	/* write the packet */
64 	nvkm_wr32(device, 0x10a1c0, 0x01000000 | (((addr & 0x07) << 4) +
65 				pmu->send.base));
66 	nvkm_wr32(device, 0x10a1c4, process);
67 	nvkm_wr32(device, 0x10a1c4, message);
68 	nvkm_wr32(device, 0x10a1c4, data0);
69 	nvkm_wr32(device, 0x10a1c4, data1);
70 	nvkm_wr32(device, 0x10a4a0, (addr + 1) & 0x0f);
71 
72 	/* release data segment access */
73 	nvkm_wr32(device, 0x10a580, 0x00000000);
74 
75 	/* wait for reply, if requested */
76 	if (reply) {
77 		wait_event(pmu->recv.wait, (pmu->recv.process == 0));
78 		reply[0] = pmu->recv.data[0];
79 		reply[1] = pmu->recv.data[1];
80 	}
81 
82 	mutex_unlock(&subdev->mutex);
83 	return 0;
84 }
85 
86 void
87 gt215_pmu_recv(struct nvkm_pmu *pmu)
88 {
89 	struct nvkm_subdev *subdev = &pmu->subdev;
90 	struct nvkm_device *device = subdev->device;
91 	u32 process, message, data0, data1;
92 
93 	/* nothing to do if GET == PUT */
94 	u32 addr =  nvkm_rd32(device, 0x10a4cc);
95 	if (addr == nvkm_rd32(device, 0x10a4c8))
96 		return;
97 
98 	/* acquire data segment access */
99 	do {
100 		nvkm_wr32(device, 0x10a580, 0x00000002);
101 	} while (nvkm_rd32(device, 0x10a580) != 0x00000002);
102 
103 	/* read the packet */
104 	nvkm_wr32(device, 0x10a1c0, 0x02000000 | (((addr & 0x07) << 4) +
105 				pmu->recv.base));
106 	process = nvkm_rd32(device, 0x10a1c4);
107 	message = nvkm_rd32(device, 0x10a1c4);
108 	data0   = nvkm_rd32(device, 0x10a1c4);
109 	data1   = nvkm_rd32(device, 0x10a1c4);
110 	nvkm_wr32(device, 0x10a4cc, (addr + 1) & 0x0f);
111 
112 	/* release data segment access */
113 	nvkm_wr32(device, 0x10a580, 0x00000000);
114 
115 	/* wake process if it's waiting on a synchronous reply */
116 	if (pmu->recv.process) {
117 		if (process == pmu->recv.process &&
118 		    message == pmu->recv.message) {
119 			pmu->recv.data[0] = data0;
120 			pmu->recv.data[1] = data1;
121 			pmu->recv.process = 0;
122 			wake_up(&pmu->recv.wait);
123 			return;
124 		}
125 	}
126 
127 	/* right now there's no other expected responses from the engine,
128 	 * so assume that any unexpected message is an error.
129 	 */
130 	nvkm_warn(subdev, "%c%c%c%c %08x %08x %08x %08x\n",
131 		  (char)((process & 0x000000ff) >>  0),
132 		  (char)((process & 0x0000ff00) >>  8),
133 		  (char)((process & 0x00ff0000) >> 16),
134 		  (char)((process & 0xff000000) >> 24),
135 		  process, message, data0, data1);
136 }
137 
138 void
139 gt215_pmu_intr(struct nvkm_pmu *pmu)
140 {
141 	struct nvkm_subdev *subdev = &pmu->subdev;
142 	struct nvkm_device *device = subdev->device;
143 	u32 disp = nvkm_rd32(device, 0x10a01c);
144 	u32 intr = nvkm_rd32(device, 0x10a008) & disp & ~(disp >> 16);
145 
146 	if (intr & 0x00000020) {
147 		u32 stat = nvkm_rd32(device, 0x10a16c);
148 		if (stat & 0x80000000) {
149 			nvkm_error(subdev, "UAS fault at %06x addr %08x\n",
150 				   stat & 0x00ffffff,
151 				   nvkm_rd32(device, 0x10a168));
152 			nvkm_wr32(device, 0x10a16c, 0x00000000);
153 			intr &= ~0x00000020;
154 		}
155 	}
156 
157 	if (intr & 0x00000040) {
158 		schedule_work(&pmu->recv.work);
159 		nvkm_wr32(device, 0x10a004, 0x00000040);
160 		intr &= ~0x00000040;
161 	}
162 
163 	if (intr & 0x00000080) {
164 		nvkm_info(subdev, "wr32 %06x %08x\n",
165 			  nvkm_rd32(device, 0x10a7a0),
166 			  nvkm_rd32(device, 0x10a7a4));
167 		nvkm_wr32(device, 0x10a004, 0x00000080);
168 		intr &= ~0x00000080;
169 	}
170 
171 	if (intr) {
172 		nvkm_error(subdev, "intr %08x\n", intr);
173 		nvkm_wr32(device, 0x10a004, intr);
174 	}
175 }
176 
177 void
178 gt215_pmu_fini(struct nvkm_pmu *pmu)
179 {
180 	nvkm_wr32(pmu->subdev.device, 0x10a014, 0x00000060);
181 }
182 
183 static void
184 gt215_pmu_reset(struct nvkm_pmu *pmu)
185 {
186 	struct nvkm_device *device = pmu->subdev.device;
187 	nvkm_mask(device, 0x022210, 0x00000001, 0x00000000);
188 	nvkm_mask(device, 0x022210, 0x00000001, 0x00000001);
189 	nvkm_rd32(device, 0x022210);
190 }
191 
192 static bool
193 gt215_pmu_enabled(struct nvkm_pmu *pmu)
194 {
195 	return nvkm_rd32(pmu->subdev.device, 0x022210) & 0x00000001;
196 }
197 
198 int
199 gt215_pmu_init(struct nvkm_pmu *pmu)
200 {
201 	struct nvkm_device *device = pmu->subdev.device;
202 	int i;
203 
204 	/* upload data segment */
205 	nvkm_wr32(device, 0x10a1c0, 0x01000000);
206 	for (i = 0; i < pmu->func->data.size / 4; i++)
207 		nvkm_wr32(device, 0x10a1c4, pmu->func->data.data[i]);
208 
209 	/* upload code segment */
210 	nvkm_wr32(device, 0x10a180, 0x01000000);
211 	for (i = 0; i < pmu->func->code.size / 4; i++) {
212 		if ((i & 0x3f) == 0)
213 			nvkm_wr32(device, 0x10a188, i >> 6);
214 		nvkm_wr32(device, 0x10a184, pmu->func->code.data[i]);
215 	}
216 
217 	/* start it running */
218 	nvkm_wr32(device, 0x10a10c, 0x00000000);
219 	nvkm_wr32(device, 0x10a104, 0x00000000);
220 	nvkm_wr32(device, 0x10a100, 0x00000002);
221 
222 	/* wait for valid host->pmu ring configuration */
223 	if (nvkm_msec(device, 2000,
224 		if (nvkm_rd32(device, 0x10a4d0))
225 			break;
226 	) < 0)
227 		return -EBUSY;
228 	pmu->send.base = nvkm_rd32(device, 0x10a4d0) & 0x0000ffff;
229 	pmu->send.size = nvkm_rd32(device, 0x10a4d0) >> 16;
230 
231 	/* wait for valid pmu->host ring configuration */
232 	if (nvkm_msec(device, 2000,
233 		if (nvkm_rd32(device, 0x10a4dc))
234 			break;
235 	) < 0)
236 		return -EBUSY;
237 	pmu->recv.base = nvkm_rd32(device, 0x10a4dc) & 0x0000ffff;
238 	pmu->recv.size = nvkm_rd32(device, 0x10a4dc) >> 16;
239 
240 	nvkm_wr32(device, 0x10a010, 0x000000e0);
241 	return 0;
242 }
243 
244 static const struct nvkm_pmu_func
245 gt215_pmu = {
246 	.code.data = gt215_pmu_code,
247 	.code.size = sizeof(gt215_pmu_code),
248 	.data.data = gt215_pmu_data,
249 	.data.size = sizeof(gt215_pmu_data),
250 	.enabled = gt215_pmu_enabled,
251 	.reset = gt215_pmu_reset,
252 	.init = gt215_pmu_init,
253 	.fini = gt215_pmu_fini,
254 	.intr = gt215_pmu_intr,
255 	.send = gt215_pmu_send,
256 	.recv = gt215_pmu_recv,
257 };
258 
259 int
260 gt215_pmu_new(struct nvkm_device *device, int index, struct nvkm_pmu **ppmu)
261 {
262 	return nvkm_pmu_new_(&gt215_pmu, device, index, ppmu);
263 }
264