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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 | } |