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, 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