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/ibus.h>
23 #include <subdev/timer.h>
24
25 static void
gk20a_ibus_init_ibus_ring(struct nvkm_subdev * ibus)26 gk20a_ibus_init_ibus_ring(struct nvkm_subdev *ibus)
27 {
28 struct nvkm_device *device = ibus->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
48 static void
gk20a_ibus_intr(struct nvkm_subdev * ibus)49 gk20a_ibus_intr(struct nvkm_subdev *ibus)
50 {
51 struct nvkm_device *device = ibus->device;
52 u32 status0 = nvkm_rd32(device, 0x120058);
53
54 if (status0 & 0x7) {
55 nvkm_debug(ibus, "resetting ibus ring\n");
56 gk20a_ibus_init_ibus_ring(ibus);
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
67 static int
gk20a_ibus_init(struct nvkm_subdev * ibus)68 gk20a_ibus_init(struct nvkm_subdev *ibus)
69 {
70 gk20a_ibus_init_ibus_ring(ibus);
71 return 0;
72 }
73
74 static const struct nvkm_subdev_func
75 gk20a_ibus = {
76 .init = gk20a_ibus_init,
77 .intr = gk20a_ibus_intr,
78 };
79
80 int
gk20a_ibus_new(struct nvkm_device * device,int index,struct nvkm_subdev ** pibus)81 gk20a_ibus_new(struct nvkm_device *device, int index,
82 struct nvkm_subdev **pibus)
83 {
84 return nvkm_subdev_new_(&gk20a_ibus, device, index, pibus);
85 }
86
