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_gem_vram_helper.h>
32 #include <drm/drm_managed.h>
33 #include <drm/drm_print.h>
34 
35 #include "ast_drv.h"
36 
ast_get_vram_size(struct ast_private * ast)37 static u32 ast_get_vram_size(struct ast_private *ast)
38 {
39 	u8 jreg;
40 	u32 vram_size;
41 
42 	ast_open_key(ast);
43 
44 	vram_size = AST_VIDMEM_DEFAULT_SIZE;
45 	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
46 	switch (jreg & 3) {
47 	case 0:
48 		vram_size = AST_VIDMEM_SIZE_8M;
49 		break;
50 	case 1:
51 		vram_size = AST_VIDMEM_SIZE_16M;
52 		break;
53 	case 2:
54 		vram_size = AST_VIDMEM_SIZE_32M;
55 		break;
56 	case 3:
57 		vram_size = AST_VIDMEM_SIZE_64M;
58 		break;
59 	}
60 
61 	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
62 	switch (jreg & 0x03) {
63 	case 1:
64 		vram_size -= 0x100000;
65 		break;
66 	case 2:
67 		vram_size -= 0x200000;
68 		break;
69 	case 3:
70 		vram_size -= 0x400000;
71 		break;
72 	}
73 
74 	return vram_size;
75 }
76 
ast_mm_init(struct ast_private * ast)77 int ast_mm_init(struct ast_private *ast)
78 {
79 	struct drm_device *dev = &ast->base;
80 	struct pci_dev *pdev = to_pci_dev(dev->dev);
81 	resource_size_t base, size;
82 	u32 vram_size;
83 	int ret;
84 
85 	base = pci_resource_start(pdev, 0);
86 	size = pci_resource_len(pdev, 0);
87 
88 	/* Don't fail on errors, but performance might be reduced. */
89 	devm_arch_io_reserve_memtype_wc(dev->dev, base, size);
90 	devm_arch_phys_wc_add(dev->dev, base, size);
91 
92 	vram_size = ast_get_vram_size(ast);
93 
94 	ret = drmm_vram_helper_init(dev, base, vram_size);
95 	if (ret) {
96 		drm_err(dev, "Error initializing VRAM MM; %d\n", ret);
97 		return ret;
98 	}
99 
100 	return 0;
101 }
102