1/*
  2 * Copyright 2021 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#define nvkm_uhead(p) container_of((p), struct nvkm_head, object)
 23#include "head.h"
 24#include <core/event.h>
 25
 26#include <nvif/if0013.h>
 27
 28#include <nvif/event.h>
 29
 30static int
 31nvkm_uhead_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_uevent *uevent)
 32{
 33	struct nvkm_head *head = nvkm_uhead(object);
 34	union nvif_head_event_args *args = argv;
 35
 36	if (!uevent)
 37		return 0;
 38	if (argc != sizeof(args->vn))
 39		return -ENOSYS;
 40
 41	return nvkm_uevent_add(uevent, &head->disp->vblank, head->id,
 42			       NVKM_DISP_HEAD_EVENT_VBLANK, NULL);
 43}
 44
 45static int
 46nvkm_uhead_mthd_scanoutpos(struct nvkm_head *head, void *argv, u32 argc)
 47{
 48	union nvif_head_scanoutpos_args *args = argv;
 49
 50	if (argc != sizeof(args->v0) || args->v0.version != 0)
 51		return -ENOSYS;
 52
 53	head->func->state(head, &head->arm);
 54	args->v0.vtotal  = head->arm.vtotal;
 55	args->v0.vblanks = head->arm.vblanks;
 56	args->v0.vblanke = head->arm.vblanke;
 57	args->v0.htotal  = head->arm.htotal;
 58	args->v0.hblanks = head->arm.hblanks;
 59	args->v0.hblanke = head->arm.hblanke;
 60
 61	/* We don't support reading htotal/vtotal on pre-NV50 VGA,
 62	 * so we have to give up and trigger the timestamping
 63	 * fallback in the drm core.
 64	 */
 65	if (!args->v0.vtotal || !args->v0.htotal)
 66		return -ENOTSUPP;
 67
 68	args->v0.time[0] = ktime_to_ns(ktime_get());
 69	head->func->rgpos(head, &args->v0.hline, &args->v0.vline);
 70	args->v0.time[1] = ktime_to_ns(ktime_get());
 71	return 0;
 72}
 73
 74static int
 75nvkm_uhead_mthd(struct nvkm_object *object, u32 mthd, void *argv, u32 argc)
 76{
 77	struct nvkm_head *head = nvkm_uhead(object);
 78
 79	switch (mthd) {
 80	case NVIF_HEAD_V0_SCANOUTPOS: return nvkm_uhead_mthd_scanoutpos(head, argv, argc);
 81	default:
 82		return -EINVAL;
 83	}
 84}
 85
 86static void *
 87nvkm_uhead_dtor(struct nvkm_object *object)
 88{
 89	struct nvkm_head *head = nvkm_uhead(object);
 90	struct nvkm_disp *disp = head->disp;
 91
 92	spin_lock(&disp->client.lock);
 93	head->object.func = NULL;
 94	spin_unlock(&disp->client.lock);
 95	return NULL;
 96}
 97
 98static const struct nvkm_object_func
 99nvkm_uhead = {
100	.dtor = nvkm_uhead_dtor,
101	.mthd = nvkm_uhead_mthd,
102	.uevent = nvkm_uhead_uevent,
103};
104
105int
106nvkm_uhead_new(const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nvkm_object **pobject)
107{
108	struct nvkm_disp *disp = nvkm_udisp(oclass->parent);
109	struct nvkm_head *head;
110	union nvif_head_args *args = argv;
111	int ret;
112
113	if (argc != sizeof(args->v0) || args->v0.version != 0)
114		return -ENOSYS;
115	if (!(head = nvkm_head_find(disp, args->v0.id)))
116		return -EINVAL;
117
118	ret = -EBUSY;
119	spin_lock(&disp->client.lock);
120	if (!head->object.func) {
121		nvkm_object_ctor(&nvkm_uhead, oclass, &head->object);
122		*pobject = &head->object;
123		ret = 0;
124	}
125	spin_unlock(&disp->client.lock);
126	return ret;
127}