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