1/*
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>
11
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}
95