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
23#include <subdev/ibus.h>
24#include <subdev/timer.h>
25
26struct gk20a_ibus_priv {
27 struct nouveau_ibus base;
28};
29
30static void
31gk20a_ibus_init_priv_ring(struct gk20a_ibus_priv *priv)
32{
33 nv_mask(priv, 0x137250, 0x3f, 0);
34
35 nv_mask(priv, 0x000200, 0x20, 0);
36 usleep_range(20, 30);
37 nv_mask(priv, 0x000200, 0x20, 0x20);
38
39 nv_wr32(priv, 0x12004c, 0x4);
40 nv_wr32(priv, 0x122204, 0x2);
41 nv_rd32(priv, 0x122204);
42}
43
44static void
45gk20a_ibus_intr(struct nouveau_subdev *subdev)
46{
47 struct gk20a_ibus_priv *priv = (void *)subdev;
48 u32 status0 = nv_rd32(priv, 0x120058);
49
50 if (status0 & 0x7) {
51 nv_debug(priv, "resetting priv ring\n");
52 gk20a_ibus_init_priv_ring(priv);
53 }
54
55 /* Acknowledge interrupt */
56 nv_mask(priv, 0x12004c, 0x2, 0x2);
57
58 if (!nv_wait(subdev, 0x12004c, 0x3f, 0x00))
59 nv_warn(priv, "timeout waiting for ringmaster ack\n");
60}
61
62static int
63gk20a_ibus_init(struct nouveau_object *object)
64{
65 struct gk20a_ibus_priv *priv = (void *)object;
66 int ret;
67
68 ret = _nouveau_ibus_init(object);
69 if (ret)
70 return ret;
71
72 gk20a_ibus_init_priv_ring(priv);
73
74 return 0;
75}
76
77static int
78gk20a_ibus_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
79 struct nouveau_oclass *oclass, void *data, u32 size,
80 struct nouveau_object **pobject)
81{
82 struct gk20a_ibus_priv *priv;
83 int ret;
84
85 ret = nouveau_ibus_create(parent, engine, oclass, &priv);
86 *pobject = nv_object(priv);
87 if (ret)
88 return ret;
89
90 nv_subdev(priv)->intr = gk20a_ibus_intr;
91 return 0;
92}
93
94struct nouveau_oclass
95gk20a_ibus_oclass = {
96 .handle = NV_SUBDEV(IBUS, 0xea),
97 .ofuncs = &(struct nouveau_ofuncs) {
98 .ctor = gk20a_ibus_ctor,
99 .dtor = _nouveau_ibus_dtor,
100 .init = gk20a_ibus_init,
101 .fini = _nouveau_ibus_fini,
102 },
103};
104