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      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 
      8 struct nvkm_alarm {
      9 	struct list_head head;
     10 	struct list_head exec;
     11 	u64 timestamp;
     12 	void (*func)(struct nvkm_alarm *);
     13 };
     14 
     15 static inline void
     16 nvkm_alarm_init(struct nvkm_alarm *alarm, void (*func)(struct nvkm_alarm *))
     17 {
     18 	INIT_LIST_HEAD(&alarm->head);
     19 	alarm->func = func;
     20 }
     21 
     22 struct 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 
     30 u64 nvkm_timer_read(struct nvkm_timer *);
     31 void nvkm_timer_alarm(struct nvkm_timer *, u32 nsec, struct nvkm_alarm *);
     32 
     33 struct nvkm_timer_wait {
     34 	struct nvkm_timer *tmr;
     35 	u64 limit;
     36 	u64 time0;
     37 	u64 time1;
     38 	int reads;
     39 };
     40 
     41 void nvkm_timer_wait_init(struct nvkm_device *, u64 nsec,
     42 			  struct nvkm_timer_wait *);
     43 s64 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 
     81 int nv04_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
     82 int nv40_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
     83 int nv41_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
     84 int gk20a_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
     85 #endif
     86