ast_mm.c

 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, 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, 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, base, size);
85	devm_arch_phys_wc_add(dev->dev, base, size);
86
87	vram_size = ast_get_vram_size(ast);
88
89	ast->vram = devm_ioremap_wc(dev->dev, base, 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}