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 */
40int 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 */
62void 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