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      1 /*	$NetBSD: nouveau_nvkm_subdev_timer_nv04.c,v 1.3 2021/12/18 23:45:42 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Ben Skeggs
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_timer_nv04.c,v 1.3 2021/12/18 23:45:42 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 #include "regsnv04.h"
     31 
     32 void
     33 nv04_timer_time(struct nvkm_timer *tmr, u64 time)
     34 {
     35 	struct nvkm_subdev *subdev = &tmr->subdev;
     36 	struct nvkm_device *device = subdev->device;
     37 	u32 hi = upper_32_bits(time);
     38 	u32 lo = lower_32_bits(time);
     39 
     40 	nvkm_debug(subdev, "time low        : %08x\n", lo);
     41 	nvkm_debug(subdev, "time high       : %08x\n", hi);
     42 
     43 	nvkm_wr32(device, NV04_PTIMER_TIME_1, hi);
     44 	nvkm_wr32(device, NV04_PTIMER_TIME_0, lo);
     45 }
     46 
     47 u64
     48 nv04_timer_read(struct nvkm_timer *tmr)
     49 {
     50 	struct nvkm_device *device = tmr->subdev.device;
     51 	u32 hi, lo;
     52 
     53 	do {
     54 		hi = nvkm_rd32(device, NV04_PTIMER_TIME_1);
     55 		lo = nvkm_rd32(device, NV04_PTIMER_TIME_0);
     56 	} while (hi != nvkm_rd32(device, NV04_PTIMER_TIME_1));
     57 
     58 	return ((u64)hi << 32 | lo);
     59 }
     60 
     61 void
     62 nv04_timer_alarm_fini(struct nvkm_timer *tmr)
     63 {
     64 	struct nvkm_device *device = tmr->subdev.device;
     65 	nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000000);
     66 }
     67 
     68 void
     69 nv04_timer_alarm_init(struct nvkm_timer *tmr, u32 time)
     70 {
     71 	struct nvkm_device *device = tmr->subdev.device;
     72 	nvkm_wr32(device, NV04_PTIMER_ALARM_0, time);
     73 	nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000001);
     74 }
     75 
     76 void
     77 nv04_timer_intr(struct nvkm_timer *tmr)
     78 {
     79 	struct nvkm_subdev *subdev = &tmr->subdev;
     80 	struct nvkm_device *device = subdev->device;
     81 	u32 stat = nvkm_rd32(device, NV04_PTIMER_INTR_0);
     82 
     83 	if (stat & 0x00000001) {
     84 		nvkm_wr32(device, NV04_PTIMER_INTR_0, 0x00000001);
     85 		nvkm_timer_alarm_trigger(tmr);
     86 		stat &= ~0x00000001;
     87 	}
     88 
     89 	if (stat) {
     90 		nvkm_error(subdev, "intr %08x\n", stat);
     91 		nvkm_wr32(device, NV04_PTIMER_INTR_0, stat);
     92 	}
     93 }
     94 
     95 static void
     96 nv04_timer_init(struct nvkm_timer *tmr)
     97 {
     98 	struct nvkm_subdev *subdev = &tmr->subdev;
     99 	struct nvkm_device *device = subdev->device;
    100 	u32 f = 0; /*XXX: nvclk */
    101 	u32 n, d;
    102 
    103 	/* aim for 31.25MHz, which gives us nanosecond timestamps */
    104 	d = 1000000 / 32;
    105 	n = f;
    106 
    107 	if (!f) {
    108 		n = nvkm_rd32(device, NV04_PTIMER_NUMERATOR);
    109 		d = nvkm_rd32(device, NV04_PTIMER_DENOMINATOR);
    110 		if (!n || !d) {
    111 			n = 1;
    112 			d = 1;
    113 		}
    114 		nvkm_warn(subdev, "unknown input clock freq\n");
    115 	}
    116 
    117 	/* reduce ratio to acceptable values */
    118 	while (((n % 5) == 0) && ((d % 5) == 0)) {
    119 		n /= 5;
    120 		d /= 5;
    121 	}
    122 
    123 	while (((n % 2) == 0) && ((d % 2) == 0)) {
    124 		n /= 2;
    125 		d /= 2;
    126 	}
    127 
    128 	while (n > 0xffff || d > 0xffff) {
    129 		n >>= 1;
    130 		d >>= 1;
    131 	}
    132 
    133 	nvkm_debug(subdev, "input frequency : %dHz\n", f);
    134 	nvkm_debug(subdev, "numerator       : %08x\n", n);
    135 	nvkm_debug(subdev, "denominator     : %08x\n", d);
    136 	nvkm_debug(subdev, "timer frequency : %dHz\n", f * d / n);
    137 
    138 	nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n);
    139 	nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d);
    140 }
    141 
    142 static const struct nvkm_timer_func
    143 nv04_timer = {
    144 	.init = nv04_timer_init,
    145 	.intr = nv04_timer_intr,
    146 	.read = nv04_timer_read,
    147 	.time = nv04_timer_time,
    148 	.alarm_init = nv04_timer_alarm_init,
    149 	.alarm_fini = nv04_timer_alarm_fini,
    150 };
    151 
    152 int
    153 nv04_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr)
    154 {
    155 	return nvkm_timer_new_(&nv04_timer, device, index, ptmr);
    156 }
    157