| Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 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 | } |