1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/timer.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/timer.h
new file mode 100644
index 000000000..439a3f72b
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/timer.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NVKM_TIMER_H__
+#define __NVKM_TIMER_H__
+#include <core/subdev.h>
+
+struct nvkm_alarm {
+	struct list_head head;
+	struct list_head exec;
+	u64 timestamp;
+	void (*func)(struct nvkm_alarm *);
+};
+
+static inline void
+nvkm_alarm_init(struct nvkm_alarm *alarm, void (*func)(struct nvkm_alarm *))
+{
+	INIT_LIST_HEAD(&alarm->head);
+	alarm->func = func;
+}
+
+struct nvkm_timer {
+	const struct nvkm_timer_func *func;
+	struct nvkm_subdev subdev;
+
+	struct list_head alarms;
+	spinlock_t lock;
+};
+
+u64 nvkm_timer_read(struct nvkm_timer *);
+void nvkm_timer_alarm(struct nvkm_timer *, u32 nsec, struct nvkm_alarm *);
+
+struct nvkm_timer_wait {
+	struct nvkm_timer *tmr;
+	u64 limit;
+	u64 time0;
+	u64 time1;
+	int reads;
+};
+
+void nvkm_timer_wait_init(struct nvkm_device *, u64 nsec,
+			  struct nvkm_timer_wait *);
+s64 nvkm_timer_wait_test(struct nvkm_timer_wait *);
+
+/* Delay based on GPU time (ie. PTIMER).
+ *
+ * Will return -ETIMEDOUT unless the loop was terminated with 'break',
+ * where it will return the number of nanoseconds taken instead.
+ *
+ * NVKM_DELAY can be passed for 'cond' to disable the timeout warning,
+ * which is useful for unconditional delay loops.
+ */
+#define NVKM_DELAY _warn = false;
+#define nvkm_nsec(d,n,cond...) ({                                              \
+	struct nvkm_timer_wait _wait;                                          \
+	bool _warn = true;                                                     \
+	s64 _taken = 0;                                                        \
+                                                                               \
+	nvkm_timer_wait_init((d), (n), &_wait);                                \
+	do {                                                                   \
+		cond                                                           \
+	} while ((_taken = nvkm_timer_wait_test(&_wait)) >= 0);                \
+                                                                               \
+	if (_warn && _taken < 0)                                               \
+		dev_WARN(_wait.tmr->subdev.device->dev, "timeout\n");          \
+	_taken;                                                                \
+})
+#define nvkm_usec(d, u, cond...) nvkm_nsec((d), (u) * 1000ULL, ##cond)
+#define nvkm_msec(d, m, cond...) nvkm_usec((d), (m) * 1000ULL, ##cond)
+
+#define nvkm_wait_nsec(d,n,addr,mask,data)                                     \
+	nvkm_nsec(d, n,                                                        \
+		if ((nvkm_rd32(d, (addr)) & (mask)) == (data))                 \
+			break;                                                 \
+		)
+#define nvkm_wait_usec(d,u,addr,mask,data)                                     \
+	nvkm_wait_nsec((d), (u) * 1000, (addr), (mask), (data))
+#define nvkm_wait_msec(d,m,addr,mask,data)                                     \
+	nvkm_wait_usec((d), (m) * 1000, (addr), (mask), (data))
+
+int nv04_timer_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_timer **);
+int nv40_timer_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_timer **);
+int nv41_timer_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_timer **);
+int gk20a_timer_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_timer **);
+#endif