1/*	$NetBSD: timer.h,v 1.3 2021/12/18 23:45:33 riastradh Exp $	*/
2
3/* SPDX-License-Identifier: MIT */
4#ifndef __NVKM_TIMER_H__
5#define __NVKM_TIMER_H__
6#include <core/subdev.h>
7
8struct nvkm_alarm {
9	struct list_head head;
10	struct list_head exec;
11	u64 timestamp;
12	void (*func)(struct nvkm_alarm *);
13};
14
15static inline void
16nvkm_alarm_init(struct nvkm_alarm *alarm, void (*func)(struct nvkm_alarm *))
17{
18	INIT_LIST_HEAD(&alarm->head);
19	alarm->func = func;
20}
21
22struct nvkm_timer {
23	const struct nvkm_timer_func *func;
24	struct nvkm_subdev subdev;
25
26	struct list_head alarms;
27	spinlock_t lock;
28};
29
30u64 nvkm_timer_read(struct nvkm_timer *);
31void nvkm_timer_alarm(struct nvkm_timer *, u32 nsec, struct nvkm_alarm *);
32
33struct nvkm_timer_wait {
34	struct nvkm_timer *tmr;
35	u64 limit;
36	u64 time0;
37	u64 time1;
38	int reads;
39};
40
41void nvkm_timer_wait_init(struct nvkm_device *, u64 nsec,
42			  struct nvkm_timer_wait *);
43s64 nvkm_timer_wait_test(struct nvkm_timer_wait *);
44
45/* Delay based on GPU time (ie. PTIMER).
46 *
47 * Will return -ETIMEDOUT unless the loop was terminated with 'break',
48 * where it will return the number of nanoseconds taken instead.
49 *
50 * NVKM_DELAY can be passed for 'cond' to disable the timeout warning,
51 * which is useful for unconditional delay loops.
52 */
53#define NVKM_DELAY _warn = false;
54#define nvkm_nsec(d,n,cond...) ({                                              \
55	struct nvkm_timer_wait _wait;                                          \
56	bool _warn = true;                                                     \
57	s64 _taken = 0;                                                        \
58                                                                               \
59	nvkm_timer_wait_init((d), (n), &_wait);                                \
60	do {                                                                   \
61		cond                                                           \
62	} while ((_taken = nvkm_timer_wait_test(&_wait)) >= 0);                \
63                                                                               \
64	if (_warn && _taken < 0)                                               \
65		dev_WARN(_wait.tmr->subdev.device->dev, "timeout\n");          \
66	_taken;                                                                \
67})
68#define nvkm_usec(d,u,cond...) nvkm_nsec((d), (u) * 1000, ##cond)
69#define nvkm_msec(d,m,cond...) nvkm_usec((d), (m) * 1000, ##cond)
70
71#define nvkm_wait_nsec(d,n,addr,mask,data)                                     \
72	nvkm_nsec(d, n,                                                        \
73		if ((nvkm_rd32(d, (addr)) & (mask)) == (data))                 \
74			break;                                                 \
75		)
76#define nvkm_wait_usec(d,u,addr,mask,data)                                     \
77	nvkm_wait_nsec((d), (u) * 1000, (addr), (mask), (data))
78#define nvkm_wait_msec(d,m,addr,mask,data)                                     \
79	nvkm_wait_usec((d), (m) * 1000, (addr), (mask), (data))
80
81int nv04_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
82int nv40_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
83int nv41_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
84int gk20a_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
85#endif
86