1 /*
2  * Copyright 2014 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  */
25 #include <drm/drmP.h>
26 #include "amdgpu.h"
27 
28 /*
29  * GPU scratch registers helpers function.
30  */
31 /**
32  * amdgpu_gfx_scratch_get - Allocate a scratch register
33  *
34  * @adev: amdgpu_device pointer
35  * @reg: scratch register mmio offset
36  *
37  * Allocate a CP scratch register for use by the driver (all asics).
38  * Returns 0 on success or -EINVAL on failure.
39  */
40 int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg)
41 {
42 	int i;
43 
44 	for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
45 		if (adev->gfx.scratch.free[i]) {
46 			adev->gfx.scratch.free[i] = false;
47 			*reg = adev->gfx.scratch.reg[i];
48 			return 0;
49 		}
50 	}
51 	return -EINVAL;
52 }
53 
54 /**
55  * amdgpu_gfx_scratch_free - Free a scratch register
56  *
57  * @adev: amdgpu_device pointer
58  * @reg: scratch register mmio offset
59  *
60  * Free a CP scratch register allocated for use by the driver (all asics)
61  */
62 void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg)
63 {
64 	int i;
65 
66 	for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
67 		if (adev->gfx.scratch.reg[i] == reg) {
68 			adev->gfx.scratch.free[i] = true;
69 			return;
70 		}
71 	}
72 }
73