drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c

   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 }