1/* $NetBSD: nouveau_subdev_pwr_base.c,v 1.4 2015/02/25 22:12:00 riastradh Exp $ */
2
3/*
4 * Copyright 2013 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 */
26
27#include <sys/cdefs.h>
28__KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_pwr_base.c,v 1.4 2015/02/25 22:12:00 riastradh Exp $");
29
30#include <subdev/pwr.h>
31#include <subdev/timer.h>
32
33static int
34nouveau_pwr_send(struct nouveau_pwr *ppwr, u32 reply[2],
35 u32 process, u32 message, u32 data0, u32 data1)
36{
37 struct nouveau_subdev *subdev = nv_subdev(ppwr);
38 u32 addr;
39
40 /* wait for a free slot in the fifo */
41 addr = nv_rd32(ppwr, 0x10a4a0);
42 if (!nv_wait_ne(ppwr, 0x10a4b0, 0xffffffff, addr ^ 8))
43 return -EBUSY;
44
45 /* we currently only support a single process at a time waiting
46 * on a synchronous reply, take the PPWR mutex and tell the
47 * receive handler what we're waiting for
48 */
49 if (reply) {
50 mutex_lock(&subdev->mutex);
51 ppwr->recv.message = message;
52 ppwr->recv.process = process;
53 }
54
55 /* acquire data segment access */
56 do {
57 nv_wr32(ppwr, 0x10a580, 0x00000001);
58 } while (nv_rd32(ppwr, 0x10a580) != 0x00000001);
59
60 /* write the packet */
61 nv_wr32(ppwr, 0x10a1c0, 0x01000000 | (((addr & 0x07) << 4) +
62 ppwr->send.base));
63 nv_wr32(ppwr, 0x10a1c4, process);
64 nv_wr32(ppwr, 0x10a1c4, message);
65 nv_wr32(ppwr, 0x10a1c4, data0);
66 nv_wr32(ppwr, 0x10a1c4, data1);
67 nv_wr32(ppwr, 0x10a4a0, (addr + 1) & 0x0f);
68
69 /* release data segment access */
70 nv_wr32(ppwr, 0x10a580, 0x00000000);
71
72 /* wait for reply, if requested */
73 if (reply) {
74#ifdef __NetBSD__
75 int ret;
76
77 DRM_WAIT_NOINTR_UNTIL(ret, &ppwr->recv.wait, &subdev->mutex,
78 (ppwr->recv.process == 0));
79 KASSERT(ret == 0);
80#else
81 wait_event(ppwr->recv.wait, (ppwr->recv.process == 0));
82#endif
83 reply[0] = ppwr->recv.data[0];
84 reply[1] = ppwr->recv.data[1];
85 mutex_unlock(&subdev->mutex);
86 }
87
88 return 0;
89}
90
91static void
92nouveau_pwr_recv(struct work_struct *work)
93{
94 struct nouveau_pwr *ppwr =
95 container_of(work, struct nouveau_pwr, recv.work);
96 struct nouveau_subdev *subdev = nv_subdev(ppwr);
97 u32 process, message, data0, data1;
98
99 /* nothing to do if GET == PUT */
100 u32 addr = nv_rd32(ppwr, 0x10a4cc);
101 if (addr == nv_rd32(ppwr, 0x10a4c8))
102 return;
103
104 /* acquire data segment access */
105 do {
106 nv_wr32(ppwr, 0x10a580, 0x00000002);
107 } while (nv_rd32(ppwr, 0x10a580) != 0x00000002);
108
109 /* read the packet */
110 nv_wr32(ppwr, 0x10a1c0, 0x02000000 | (((addr & 0x07) << 4) +
111 ppwr->recv.base));
112 process = nv_rd32(ppwr, 0x10a1c4);
113 message = nv_rd32(ppwr, 0x10a1c4);
114 data0 = nv_rd32(ppwr, 0x10a1c4);
115 data1 = nv_rd32(ppwr, 0x10a1c4);
116 nv_wr32(ppwr, 0x10a4cc, (addr + 1) & 0x0f);
117
118 /* release data segment access */
119 nv_wr32(ppwr, 0x10a580, 0x00000000);
120
121 /* wake process if it's waiting on a synchronous reply */
122 if (ppwr->recv.process) {
123 mutex_lock(&subdev->mutex);
124 if (process == ppwr->recv.process &&
125 message == ppwr->recv.message) {
126 ppwr->recv.data[0] = data0;
127 ppwr->recv.data[1] = data1;
128 ppwr->recv.process = 0;
129#ifdef __NetBSD__
130 DRM_WAKEUP_ONE(&ppwr->recv.wait, &subdev->mutex);
131#else
132 wake_up(&ppwr->recv.wait);
133#endif
134 return;
135 }
136 mutex_unlock(&subdev->mutex);
137 }
138
139 /* right now there's no other expected responses from the engine,
140 * so assume that any unexpected message is an error.
141 */
142 nv_warn(ppwr, "%c%c%c%c 0x%08x 0x%08x 0x%08x 0x%08x\n",
143 (char)((process & 0x000000ff) >> 0),
144 (char)((process & 0x0000ff00) >> 8),
145 (char)((process & 0x00ff0000) >> 16),
146 (char)((process & 0xff000000) >> 24),
147 process, message, data0, data1);
148}
149
150static void
151nouveau_pwr_intr(struct nouveau_subdev *subdev)
152{
153 struct nouveau_pwr *ppwr = (void *)subdev;
154 u32 disp = nv_rd32(ppwr, 0x10a01c);
155 u32 intr = nv_rd32(ppwr, 0x10a008) & disp & ~(disp >> 16);
156
157 if (intr & 0x00000020) {
158 u32 stat = nv_rd32(ppwr, 0x10a16c);
159 if (stat & 0x80000000) {
160 nv_error(ppwr, "UAS fault at 0x%06x addr 0x%08x\n",
161 stat & 0x00ffffff, nv_rd32(ppwr, 0x10a168));
162 nv_wr32(ppwr, 0x10a16c, 0x00000000);
163 intr &= ~0x00000020;
164 }
165 }
166
167 if (intr & 0x00000040) {
168 schedule_work(&ppwr->recv.work);
169 nv_wr32(ppwr, 0x10a004, 0x00000040);
170 intr &= ~0x00000040;
171 }
172
173 if (intr & 0x00000080) {
174 nv_info(ppwr, "wr32 0x%06x 0x%08x\n", nv_rd32(ppwr, 0x10a7a0),
175 nv_rd32(ppwr, 0x10a7a4));
176 nv_wr32(ppwr, 0x10a004, 0x00000080);
177 intr &= ~0x00000080;
178 }
179
180 if (intr) {
181 nv_error(ppwr, "intr 0x%08x\n", intr);
182 nv_wr32(ppwr, 0x10a004, intr);
183 }
184}
185
186int
187_nouveau_pwr_fini(struct nouveau_object *object, bool suspend)
188{
189 struct nouveau_pwr *ppwr = (void *)object;
190
191 nv_wr32(ppwr, 0x10a014, 0x00000060);
192 flush_work(&ppwr->recv.work);
193
194 return nouveau_subdev_fini(&ppwr->base, suspend);
195}
196
197int
198_nouveau_pwr_init(struct nouveau_object *object)
199{
200 struct nouveau_pwr *ppwr = (void *)object;
201 int ret, i;
202
203 ret = nouveau_subdev_init(&ppwr->base);
204 if (ret)
205 return ret;
206
207 nv_subdev(ppwr)->intr = nouveau_pwr_intr;
208 ppwr->message = nouveau_pwr_send;
209
210 /* prevent previous ucode from running, wait for idle, reset */
211 nv_wr32(ppwr, 0x10a014, 0x0000ffff); /* INTR_EN_CLR = ALL */
212 nv_wait(ppwr, 0x10a04c, 0xffffffff, 0x00000000);
213 nv_mask(ppwr, 0x000200, 0x00002000, 0x00000000);
214 nv_mask(ppwr, 0x000200, 0x00002000, 0x00002000);
215
216 /* upload data segment */
217 nv_wr32(ppwr, 0x10a1c0, 0x01000000);
218 for (i = 0; i < ppwr->data.size / 4; i++)
219 nv_wr32(ppwr, 0x10a1c4, ppwr->data.data[i]);
220
221 /* upload code segment */
222 nv_wr32(ppwr, 0x10a180, 0x01000000);
223 for (i = 0; i < ppwr->code.size / 4; i++) {
224 if ((i & 0x3f) == 0)
225 nv_wr32(ppwr, 0x10a188, i >> 6);
226 nv_wr32(ppwr, 0x10a184, ppwr->code.data[i]);
227 }
228
229 /* start it running */
230 nv_wr32(ppwr, 0x10a10c, 0x00000000);
231 nv_wr32(ppwr, 0x10a104, 0x00000000);
232 nv_wr32(ppwr, 0x10a100, 0x00000002);
233
234 /* wait for valid host->pwr ring configuration */
235 if (!nv_wait_ne(ppwr, 0x10a4d0, 0xffffffff, 0x00000000))
236 return -EBUSY;
237 ppwr->send.base = nv_rd32(ppwr, 0x10a4d0) & 0x0000ffff;
238 ppwr->send.size = nv_rd32(ppwr, 0x10a4d0) >> 16;
239
240 /* wait for valid pwr->host ring configuration */
241 if (!nv_wait_ne(ppwr, 0x10a4dc, 0xffffffff, 0x00000000))
242 return -EBUSY;
243 ppwr->recv.base = nv_rd32(ppwr, 0x10a4dc) & 0x0000ffff;
244 ppwr->recv.size = nv_rd32(ppwr, 0x10a4dc) >> 16;
245
246 nv_wr32(ppwr, 0x10a010, 0x000000e0);
247 return 0;
248}
249
250int
251nouveau_pwr_create_(struct nouveau_object *parent,
252 struct nouveau_object *engine,
253 struct nouveau_oclass *oclass, int length, void **pobject)
254{
255 struct nouveau_pwr *ppwr;
256 int ret;
257
258 ret = nouveau_subdev_create_(parent, engine, oclass, 0, "PPWR",
259 "pwr", length, pobject);
260 ppwr = *pobject;
261 if (ret)
262 return ret;
263
264 INIT_WORK(&ppwr->recv.work, nouveau_pwr_recv);
265#ifdef __NetBSD__
266 DRM_INIT_WAITQUEUE(&ppwr->recv.wait, "nvppwr");
267#else
268 init_waitqueue_head(&ppwr->recv.wait);
269#endif
270 return 0;
271}
272
273#ifdef __NetBSD__
274void
275_nouveau_pwr_dtor(struct nouveau_object *object)
276{
277 struct nouveau_pwr *ppwr = (void *)object;
278
279 DRM_DESTROY_WAITQUEUE(&ppwr->recv.wait);
280
281 _nouveau_subdev_dtor(object);
282}
283#endif
284