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 
25 static void
26 gk20a_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 
48 static void
49 gk20a_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 
67 static int
68 gk20a_privring_init(struct nvkm_subdev *privring)
69 {
70 	gk20a_privring_init_privring_ring(privring);
71 	return 0;
72 }
73 
74 static const struct nvkm_subdev_func
75 gk20a_privring = {
76 	.init = gk20a_privring_init,
77 	.intr = gk20a_privring_intr,
78 };
79 
80 int
81 gk20a_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