blob: 80f61b03e9ae1cb6cad5d5b6fb7afac6f88d22b8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/video/bt455.h
3 *
4 * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
5 *
6 * This file is subject to the terms and conditions of the GNU General
7 * Public License. See the file COPYING in the main directory of this
8 * archive for more details.
9 */
10#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12/*
13 * Bt455 byte-wide registers, 32-bit aligned.
14 */
15struct bt455_regs {
16 volatile u8 addr_cmap;
17 u8 pad0[3];
18 volatile u8 addr_cmap_data;
19 u8 pad1[3];
20 volatile u8 addr_clr;
21 u8 pad2[3];
22 volatile u8 addr_ovly;
23 u8 pad3[3];
24};
25
26static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
27{
28 mb();
29 regs->addr_cmap = ir & 0x0f;
30}
31
32/*
33 * Read/write to a Bt455 color map register.
34 */
35static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr,
36 u8* red, u8* green, u8* blue)
37{
38 bt455_select_reg(regs, cr);
39 mb();
40 *red = regs->addr_cmap_data & 0x0f;
41 rmb();
42 *green = regs->addr_cmap_data & 0x0f;
43 rmb();
44 *blue = regs->addr_cmap_data & 0x0f;
45}
46
47static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr,
48 u8 red, u8 green, u8 blue)
49{
50 bt455_select_reg(regs, cr);
51 wmb();
52 regs->addr_cmap_data = red & 0x0f;
53 wmb();
54 regs->addr_cmap_data = green & 0x0f;
55 wmb();
56 regs->addr_cmap_data = blue & 0x0f;
57}
58
59static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr,
60 u8 red, u8 green, u8 blue)
61{
62 bt455_select_reg(regs, cr);
63 wmb();
64 regs->addr_ovly = red & 0x0f;
65 wmb();
66 regs->addr_ovly = green & 0x0f;
67 wmb();
68 regs->addr_ovly = blue & 0x0f;
69}
70
71static inline void bt455_set_cursor(struct bt455_regs *regs)
72{
73 mb();
74 regs->addr_ovly = 0x0f;
75 wmb();
76 regs->addr_ovly = 0x0f;
77 wmb();
78 regs->addr_ovly = 0x0f;
79}
80
81static inline void bt455_erase_cursor(struct bt455_regs *regs)
82{
83 /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */
84 /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */
85 bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03);
86 bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07);
87
88 wmb();
89 regs->addr_ovly = 0x09;
90 wmb();
91 regs->addr_ovly = 0x09;
92 wmb();
93 regs->addr_ovly = 0x09;
94}