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31649ecf BS |
1 | /* |
2 | * Copyright 2012 Red Hat Inc. | |
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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | * OTHER DEALINGS IN THE SOFTWARE. | |
21 | * | |
22 | * Authors: Ben Skeggs | |
23 | */ | |
24 | #include "priv.h" | |
25 | #include "regsnv04.h" | |
26 | ||
27 | static void | |
28 | nv41_timer_init(struct nvkm_timer *tmr) | |
29 | { | |
30 | struct nvkm_subdev *subdev = &tmr->subdev; | |
31 | struct nvkm_device *device = subdev->device; | |
32 | u32 f = device->crystal; | |
33 | u32 m = 1, n, d; | |
34 | ||
35 | /* aim for 31.25MHz, which gives us nanosecond timestamps */ | |
36 | d = 1000000 / 32; | |
37 | n = f; | |
38 | ||
39 | while (n < (d * 2)) { | |
40 | n += (n / m); | |
41 | m++; | |
42 | } | |
43 | ||
44 | /* reduce ratio to acceptable values */ | |
45 | while (((n % 5) == 0) && ((d % 5) == 0)) { | |
46 | n /= 5; | |
47 | d /= 5; | |
48 | } | |
49 | ||
50 | while (((n % 2) == 0) && ((d % 2) == 0)) { | |
51 | n /= 2; | |
52 | d /= 2; | |
53 | } | |
54 | ||
55 | while (n > 0xffff || d > 0xffff) { | |
56 | n >>= 1; | |
57 | d >>= 1; | |
58 | } | |
59 | ||
60 | nvkm_debug(subdev, "input frequency : %dHz\n", f); | |
61 | nvkm_debug(subdev, "input multiplier: %d\n", m); | |
62 | nvkm_debug(subdev, "numerator : %08x\n", n); | |
63 | nvkm_debug(subdev, "denominator : %08x\n", d); | |
64 | nvkm_debug(subdev, "timer frequency : %dHz\n", (f * m) * d / n); | |
65 | ||
66 | nvkm_wr32(device, 0x009220, m - 1); | |
67 | nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n); | |
68 | nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d); | |
69 | } | |
70 | ||
71 | static const struct nvkm_timer_func | |
72 | nv41_timer = { | |
73 | .init = nv41_timer_init, | |
74 | .intr = nv04_timer_intr, | |
75 | .read = nv04_timer_read, | |
76 | .time = nv04_timer_time, | |
77 | .alarm_init = nv04_timer_alarm_init, | |
78 | .alarm_fini = nv04_timer_alarm_fini, | |
79 | }; | |
80 | ||
81 | int | |
82 | nv41_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr) | |
83 | { | |
84 | return nvkm_timer_new_(&nv41_timer, device, index, ptmr); | |
85 | } |