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1/*2 * Copyright 2012 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Ben Skeggs23 */24#include "priv.h"25#include "regsnv04.h"26 27void28nv04_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 42u6443nv04_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 56void57nv04_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 63void64nv04_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 71void72nv04_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 90static void91nv04_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 137static const struct nvkm_timer_func138nv04_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 147int148nv04_timer_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,149 struct nvkm_timer **ptmr)150{151 return nvkm_timer_new_(&nv04_timer, device, type, inst, ptmr);152}153