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gerrit-public.fairphone.software / kernel / msm-4.9 / fe69b420d39d307cfe2cba875dc1dbf668877198 / . / drivers / video / fbdev / bt455.h
blob: dd1404b40611db952e5a8ba013a688a6887087ee [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * linux/drivers/video/bt455.h
3 *
4 * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]5 * Copyright 2016 Maciej W. Rozycki <macro@linux-mips.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file COPYING in the main directory of this
9 * archive for more details.
10 */
11#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]12
13/*
14 * Bt455 byte-wide registers, 32-bit aligned.
15 */
16struct bt455_regs {
17 volatile u8 addr_cmap;
18 u8 pad0[3];
19 volatile u8 addr_cmap_data;
20 u8 pad1[3];
21 volatile u8 addr_clr;
22 u8 pad2[3];
23 volatile u8 addr_ovly;
24 u8 pad3[3];
25};
26
27static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
28{
29 mb();
30 regs->addr_cmap = ir & 0x0f;
31}
32
Maciej W. Rozycki58327062016-02-22 01:55:27 +0000[diff] [blame]33static inline void bt455_reset_reg(struct bt455_regs *regs)
34{
35 mb();
36 regs->addr_clr = 0;
37}
38
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]39/*
40 * Read/write to a Bt455 color map register.
41 */
Maciej W. Rozycki58327062016-02-22 01:55:27 +0000[diff] [blame]42static inline void bt455_read_cmap_next(struct bt455_regs *regs, u8 *grey)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]43{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]44 mb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]45 regs->addr_cmap_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]46 rmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]47 *grey = regs->addr_cmap_data & 0xf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]48 rmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]49 regs->addr_cmap_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]50}
51
Maciej W. Rozycki58327062016-02-22 01:55:27 +0000[diff] [blame]52static inline void bt455_write_cmap_next(struct bt455_regs *regs, u8 grey)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]53{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]54 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]55 regs->addr_cmap_data = 0x0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]56 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]57 regs->addr_cmap_data = grey & 0xf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]58 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]59 regs->addr_cmap_data = 0x0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]60}
61
Maciej W. Rozycki58327062016-02-22 01:55:27 +0000[diff] [blame]62static inline void bt455_write_ovly_next(struct bt455_regs *regs, u8 grey)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]63{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]64 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]65 regs->addr_ovly = 0x0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]66 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]67 regs->addr_ovly = grey & 0xf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]68 wmb();
Maciej W. Rozycki01ac59c2016-02-22 01:55:21 +0000[diff] [blame]69 regs->addr_ovly = 0x0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]70}
Maciej W. Rozycki58327062016-02-22 01:55:27 +0000[diff] [blame]71
72static inline void bt455_read_cmap_entry(struct bt455_regs *regs,
73 int cr, u8 *grey)
74{
75 bt455_select_reg(regs, cr);
76 bt455_read_cmap_next(regs, grey);
77}
78
79static inline void bt455_write_cmap_entry(struct bt455_regs *regs,
80 int cr, u8 grey)
81{
82 bt455_select_reg(regs, cr);
83 bt455_write_cmap_next(regs, grey);
84}
85
86static inline void bt455_write_ovly_entry(struct bt455_regs *regs, u8 grey)
87{
88 bt455_reset_reg(regs);
89 bt455_write_ovly_next(regs, grey);
90}