1/*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25/*
26 * Authors: Dave Airlie <airlied@redhat.com>
27 */
28
29#include <linux/pci.h>
30
31#include <drm/drm_managed.h>
32#include <drm/drm_print.h>
33
34#include "ast_drv.h"
35
36static u32 ast_get_vram_size(struct ast_device *ast)
37{
38 u32 vram_size;
39 u8 vgacr99, vgacraa;
40
41 vgacraa = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xaa);
42 switch (vgacraa & AST_IO_VGACRAA_VGAMEM_SIZE_MASK) {
43 case 0:
44 vram_size = SZ_8M;
45 break;
46 case 1:
47 vram_size = SZ_16M;
48 break;
49 case 2:
50 vram_size = SZ_32M;
51 break;
52 case 3:
53 vram_size = SZ_64M;
54 break;
55 }
56
57 vgacr99 = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0x99);
58 switch (vgacr99 & AST_IO_VGACR99_VGAMEM_RSRV_MASK) {
59 case 1:
60 vram_size -= SZ_1M;
61 break;
62 case 2:
63 vram_size -= SZ_2M;
64 break;
65 case 3:
66 vram_size -= SZ_4M;
67 break;
68 }
69
70 return vram_size;
71}
72
73int ast_mm_init(struct ast_device *ast)
74{
75 struct drm_device *dev = &ast->base;
76 struct pci_dev *pdev = to_pci_dev(dev->dev);
77 resource_size_t base, size;
78 u32 vram_size;
79
80 base = pci_resource_start(pdev, 0);
81 size = pci_resource_len(pdev, 0);
82
83 /* Don't fail on errors, but performance might be reduced. */
84 devm_arch_io_reserve_memtype_wc(dev: dev->dev, start: base, size);
85 devm_arch_phys_wc_add(dev: dev->dev, base, size);
86
87 vram_size = ast_get_vram_size(ast);
88
89 ast->vram = devm_ioremap_wc(dev: dev->dev, offset: base, size: vram_size);
90 if (!ast->vram)
91 return -ENOMEM;
92
93 ast->vram_base = base;
94 ast->vram_size = vram_size;
95
96 return 0;
97}
98

source code of linux/drivers/gpu/drm/ast/ast_mm.c