1 /*
2  * Copyright (C) 2013 Red Hat
3  * Author: Rob Clark <robdclark@gmail.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 as published by
7  * the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #ifndef __MSM_RINGBUFFER_H__
19 #define __MSM_RINGBUFFER_H__
20 
21 #include "msm_drv.h"
22 
23 struct msm_ringbuffer {
24 	struct msm_gpu *gpu;
25 	int size;
26 	struct drm_gem_object *bo;
27 	uint32_t *start, *end, *cur;
28 };
29 
30 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size);
31 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring);
32 
33 /* ringbuffer helpers (the parts that are same for a3xx/a2xx/z180..) */
34 
35 static inline void
36 OUT_RING(struct msm_ringbuffer *ring, uint32_t data)
37 {
38 	if (ring->cur == ring->end)
39 		ring->cur = ring->start;
40 	*(ring->cur++) = data;
41 }
42 
43 #endif /* __MSM_RINGBUFFER_H__ */
44