1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * linux/drivers/video/bt455.h
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
5*4882a593Smuzhiyun * Copyright 2016 Maciej W. Rozycki <macro@linux-mips.org>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General
8*4882a593Smuzhiyun * Public License. See the file COPYING in the main directory of this
9*4882a593Smuzhiyun * archive for more details.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * Bt455 byte-wide registers, 32-bit aligned.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun struct bt455_regs {
17*4882a593Smuzhiyun volatile u8 addr_cmap;
18*4882a593Smuzhiyun u8 pad0[3];
19*4882a593Smuzhiyun volatile u8 addr_cmap_data;
20*4882a593Smuzhiyun u8 pad1[3];
21*4882a593Smuzhiyun volatile u8 addr_clr;
22*4882a593Smuzhiyun u8 pad2[3];
23*4882a593Smuzhiyun volatile u8 addr_ovly;
24*4882a593Smuzhiyun u8 pad3[3];
25*4882a593Smuzhiyun };
26*4882a593Smuzhiyun
bt455_select_reg(struct bt455_regs * regs,int ir)27*4882a593Smuzhiyun static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun mb();
30*4882a593Smuzhiyun regs->addr_cmap = ir & 0x0f;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
bt455_reset_reg(struct bt455_regs * regs)33*4882a593Smuzhiyun static inline void bt455_reset_reg(struct bt455_regs *regs)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun mb();
36*4882a593Smuzhiyun regs->addr_clr = 0;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /*
40*4882a593Smuzhiyun * Read/write to a Bt455 color map register.
41*4882a593Smuzhiyun */
bt455_read_cmap_next(struct bt455_regs * regs,u8 * grey)42*4882a593Smuzhiyun static inline void bt455_read_cmap_next(struct bt455_regs *regs, u8 *grey)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun mb();
45*4882a593Smuzhiyun regs->addr_cmap_data;
46*4882a593Smuzhiyun rmb();
47*4882a593Smuzhiyun *grey = regs->addr_cmap_data & 0xf;
48*4882a593Smuzhiyun rmb();
49*4882a593Smuzhiyun regs->addr_cmap_data;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
bt455_write_cmap_next(struct bt455_regs * regs,u8 grey)52*4882a593Smuzhiyun static inline void bt455_write_cmap_next(struct bt455_regs *regs, u8 grey)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun wmb();
55*4882a593Smuzhiyun regs->addr_cmap_data = 0x0;
56*4882a593Smuzhiyun wmb();
57*4882a593Smuzhiyun regs->addr_cmap_data = grey & 0xf;
58*4882a593Smuzhiyun wmb();
59*4882a593Smuzhiyun regs->addr_cmap_data = 0x0;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
bt455_write_ovly_next(struct bt455_regs * regs,u8 grey)62*4882a593Smuzhiyun static inline void bt455_write_ovly_next(struct bt455_regs *regs, u8 grey)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun wmb();
65*4882a593Smuzhiyun regs->addr_ovly = 0x0;
66*4882a593Smuzhiyun wmb();
67*4882a593Smuzhiyun regs->addr_ovly = grey & 0xf;
68*4882a593Smuzhiyun wmb();
69*4882a593Smuzhiyun regs->addr_ovly = 0x0;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
bt455_read_cmap_entry(struct bt455_regs * regs,int cr,u8 * grey)72*4882a593Smuzhiyun static inline void bt455_read_cmap_entry(struct bt455_regs *regs,
73*4882a593Smuzhiyun int cr, u8 *grey)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun bt455_select_reg(regs, cr);
76*4882a593Smuzhiyun bt455_read_cmap_next(regs, grey);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
bt455_write_cmap_entry(struct bt455_regs * regs,int cr,u8 grey)79*4882a593Smuzhiyun static inline void bt455_write_cmap_entry(struct bt455_regs *regs,
80*4882a593Smuzhiyun int cr, u8 grey)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun bt455_select_reg(regs, cr);
83*4882a593Smuzhiyun bt455_write_cmap_next(regs, grey);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
bt455_write_ovly_entry(struct bt455_regs * regs,u8 grey)86*4882a593Smuzhiyun static inline void bt455_write_ovly_entry(struct bt455_regs *regs, u8 grey)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun bt455_reset_reg(regs);
89*4882a593Smuzhiyun bt455_write_ovly_next(regs, grey);
90*4882a593Smuzhiyun }
91