diff options
Diffstat (limited to 'drivers/video/tegra/dc/ext/util.c')
-rw-r--r-- | drivers/video/tegra/dc/ext/util.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/video/tegra/dc/ext/util.c b/drivers/video/tegra/dc/ext/util.c new file mode 100644 index 00000000000..747085579f1 --- /dev/null +++ b/drivers/video/tegra/dc/ext/util.c | |||
@@ -0,0 +1,78 @@ | |||
1 | /* | ||
2 | * drivers/video/tegra/dc/ext/util.c | ||
3 | * | ||
4 | * Copyright (C) 2011, NVIDIA Corporation | ||
5 | * | ||
6 | * Author: Robert Morell <rmorell@nvidia.com> | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; either version 2 of the License, or | ||
11 | * (at your option) any later version. | ||
12 | * | ||
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | ||
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
16 | * more details. | ||
17 | */ | ||
18 | |||
19 | #include <linux/err.h> | ||
20 | #include <linux/types.h> | ||
21 | |||
22 | #include <mach/dc.h> | ||
23 | #include <mach/nvmap.h> | ||
24 | |||
25 | /* ugh */ | ||
26 | #include "../../nvmap/nvmap.h" | ||
27 | |||
28 | #include "tegra_dc_ext_priv.h" | ||
29 | |||
30 | int tegra_dc_ext_pin_window(struct tegra_dc_ext_user *user, u32 id, | ||
31 | struct nvmap_handle_ref **handle, | ||
32 | dma_addr_t *phys_addr) | ||
33 | { | ||
34 | struct tegra_dc_ext *ext = user->ext; | ||
35 | struct nvmap_handle_ref *win_dup; | ||
36 | struct nvmap_handle *win_handle; | ||
37 | dma_addr_t phys; | ||
38 | |||
39 | if (!id) { | ||
40 | *handle = NULL; | ||
41 | *phys_addr = -1; | ||
42 | |||
43 | return 0; | ||
44 | } | ||
45 | |||
46 | /* | ||
47 | * Take a reference to the buffer using the user's nvmap context, to | ||
48 | * make sure they have permissions to access it. | ||
49 | */ | ||
50 | win_handle = nvmap_get_handle_id(user->nvmap, id); | ||
51 | if (!win_handle) | ||
52 | return -EACCES; | ||
53 | |||
54 | /* | ||
55 | * Duplicate the buffer's handle into the dc_ext driver's nvmap | ||
56 | * context, to ensure that the handle won't be freed as long as it is | ||
57 | * in use by display. | ||
58 | */ | ||
59 | win_dup = nvmap_duplicate_handle_id(ext->nvmap, id); | ||
60 | |||
61 | /* Release the reference we took in the user's context above */ | ||
62 | nvmap_handle_put(win_handle); | ||
63 | |||
64 | if (IS_ERR(win_dup)) | ||
65 | return PTR_ERR(win_dup); | ||
66 | |||
67 | phys = nvmap_pin(ext->nvmap, win_dup); | ||
68 | /* XXX this isn't correct for non-pointers... */ | ||
69 | if (IS_ERR((void *)phys)) { | ||
70 | nvmap_free(ext->nvmap, win_dup); | ||
71 | return PTR_ERR((void *)phys); | ||
72 | } | ||
73 | |||
74 | *phys_addr = phys; | ||
75 | *handle = win_dup; | ||
76 | |||
77 | return 0; | ||
78 | } | ||