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 void
28 nv04_timer_time(struct nvkm_timer *tmr, u64 time)
29 {
30 	struct nvkm_subdev *subdev = &tmr->subdev;
31 	struct nvkm_device *device = subdev->device;
32 	u32 hi = upper_32_bits(time);
33 	u32 lo = lower_32_bits(time);
34 
35 	nvkm_debug(subdev, "time low        : %08x\n", lo);
36 	nvkm_debug(subdev, "time high       : %08x\n", hi);
37 
38 	nvkm_wr32(device, NV04_PTIMER_TIME_1, hi);
39 	nvkm_wr32(device, NV04_PTIMER_TIME_0, lo);
40 }
41 
42 u64
43 nv04_timer_read(struct nvkm_timer *tmr)
44 {
45 	struct nvkm_device *device = tmr->subdev.device;
46 	u32 hi, lo;
47 
48 	do {
49 		hi = nvkm_rd32(device, NV04_PTIMER_TIME_1);
50 		lo = nvkm_rd32(device, NV04_PTIMER_TIME_0);
51 	} while (hi != nvkm_rd32(device, NV04_PTIMER_TIME_1));
52 
53 	return ((u64)hi << 32 | lo);
54 }
55 
56 void
57 nv04_timer_alarm_fini(struct nvkm_timer *tmr)
58 {
59 	struct nvkm_device *device = tmr->subdev.device;
60 	nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000000);
61 }
62 
63 void
64 nv04_timer_alarm_init(struct nvkm_timer *tmr, u32 time)
65 {
66 	struct nvkm_device *device = tmr->subdev.device;
67 	nvkm_wr32(device, NV04_PTIMER_ALARM_0, time);
68 	nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000001);
69 }
70 
71 void
72 nv04_timer_intr(struct nvkm_timer *tmr)
73 {
74 	struct nvkm_subdev *subdev = &tmr->subdev;
75 	struct nvkm_device *device = subdev->device;
76 	u32 stat = nvkm_rd32(device, NV04_PTIMER_INTR_0);
77 
78 	if (stat & 0x00000001) {
79 		nvkm_wr32(device, NV04_PTIMER_INTR_0, 0x00000001);
80 		nvkm_timer_alarm_trigger(tmr);
81 		stat &= ~0x00000001;
82 	}
83 
84 	if (stat) {
85 		nvkm_error(subdev, "intr %08x\n", stat);
86 		nvkm_wr32(device, NV04_PTIMER_INTR_0, stat);
87 	}
88 }
89 
90 static void
91 nv04_timer_init(struct nvkm_timer *tmr)
92 {
93 	struct nvkm_subdev *subdev = &tmr->subdev;
94 	struct nvkm_device *device = subdev->device;
95 	u32 f = 0; /*XXX: nvclk */
96 	u32 n, d;
97 
98 	/* aim for 31.25MHz, which gives us nanosecond timestamps */
99 	d = 1000000 / 32;
100 	n = f;
101 
102 	if (!f) {
103 		n = nvkm_rd32(device, NV04_PTIMER_NUMERATOR);
104 		d = nvkm_rd32(device, NV04_PTIMER_DENOMINATOR);
105 		if (!n || !d) {
106 			n = 1;
107 			d = 1;
108 		}
109 		nvkm_warn(subdev, "unknown input clock freq\n");
110 	}
111 
112 	/* reduce ratio to acceptable values */
113 	while (((n % 5) == 0) && ((d % 5) == 0)) {
114 		n /= 5;
115 		d /= 5;
116 	}
117 
118 	while (((n % 2) == 0) && ((d % 2) == 0)) {
119 		n /= 2;
120 		d /= 2;
121 	}
122 
123 	while (n > 0xffff || d > 0xffff) {
124 		n >>= 1;
125 		d >>= 1;
126 	}
127 
128 	nvkm_debug(subdev, "input frequency : %dHz\n", f);
129 	nvkm_debug(subdev, "numerator       : %08x\n", n);
130 	nvkm_debug(subdev, "denominator     : %08x\n", d);
131 	nvkm_debug(subdev, "timer frequency : %dHz\n", f * d / n);
132 
133 	nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n);
134 	nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d);
135 }
136 
137 static const struct nvkm_timer_func
138 nv04_timer = {
139 	.init = nv04_timer_init,
140 	.intr = nv04_timer_intr,
141 	.read = nv04_timer_read,
142 	.time = nv04_timer_time,
143 	.alarm_init = nv04_timer_alarm_init,
144 	.alarm_fini = nv04_timer_alarm_fini,
145 };
146 
147 int
148 nv04_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr)
149 {
150 	return nvkm_timer_new_(&nv04_timer, device, index, ptmr);
151 }
152