1/*
2 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 */
22#include <subdev/privring.h>
23#include <subdev/timer.h>
24
25static void
26gk20a_privring_init_privring_ring(struct nvkm_subdev *privring)
27{
28	struct nvkm_device *device = privring->device;
29	nvkm_mask(device, 0x137250, 0x3f, 0);
30
31	nvkm_mask(device, 0x000200, 0x20, 0);
32	udelay(20);
33	nvkm_mask(device, 0x000200, 0x20, 0x20);
34
35	nvkm_wr32(device, 0x12004c, 0x4);
36	nvkm_wr32(device, 0x122204, 0x2);
37	nvkm_rd32(device, 0x122204);
38
39	/*
40	 * Bug: increase clock timeout to avoid operation failure at high
41	 * gpcclk rate.
42	 */
43	nvkm_wr32(device, 0x122354, 0x800);
44	nvkm_wr32(device, 0x128328, 0x800);
45	nvkm_wr32(device, 0x124320, 0x800);
46}
47
48static void
49gk20a_privring_intr(struct nvkm_subdev *privring)
50{
51	struct nvkm_device *device = privring->device;
52	u32 status0 = nvkm_rd32(device, 0x120058);
53
54	if (status0 & 0x7) {
55		nvkm_debug(privring, "resetting privring ring\n");
56		gk20a_privring_init_privring_ring(privring);
57	}
58
59	/* Acknowledge interrupt */
60	nvkm_mask(device, 0x12004c, 0x2, 0x2);
61	nvkm_msec(device, 2000,
62		if (!(nvkm_rd32(device, 0x12004c) & 0x0000003f))
63			break;
64	);
65}
66
67static int
68gk20a_privring_init(struct nvkm_subdev *privring)
69{
70	gk20a_privring_init_privring_ring(privring);
71	return 0;
72}
73
74static const struct nvkm_subdev_func
75gk20a_privring = {
76	.init = gk20a_privring_init,
77	.intr = gk20a_privring_intr,
78};
79
80int
81gk20a_privring_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
82		   struct nvkm_subdev **pprivring)
83{
84	return nvkm_subdev_new_(&gk20a_privring, device, type, inst, pprivring);
85}
86