1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Andree Buschmann
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
.section .icode, "ax", %progbits
/****************************************************************************
* void lcd_write_data(const fb_data *addr,
* int pixelcount);
*
* Writes pixelcount pixels from src-pointer (lcd_framebuffer) to BCM dataport.
* Use the sequence 2:2:2:2 (2 = read/write 2 regs) for best performance.
*/
.align 2
.global lcd_write_data
.type lcd_write_data, %function
/* r0 = addr, must be aligned */
lcd_write_data: /* r1 = pixel count, must be even */
stmfd sp!, {r4, lr}
mov lr, #0x30000000 /* LCD data port */
subs r1, r1, #16
.loop16:
ldmgeia r0!, {r2-r3}
stmgeia lr, {r2-r3}
ldmgeia r0!, {r2-r3}
stmgeia lr, {r2-r3}
ldmgeia r0!, {r2-r3}
stmgeia lr, {r2-r3}
ldmgeia r0!, {r2-r3}
stmgeia lr, {r2-r3}
subges r1, r1, #16
bge .loop16
/* no need to correct the count, we're just checking bits from now */
tst r1, #8
ldmneia r0!, {r2-r4, r12}
stmneia lr, {r2-r4, r12}
tst r1, #4
ldmneia r0!, {r2-r3}
stmneia lr, {r2-r3}
tst r1, #2
ldrne r3, [r0], #4
strne r3, [lr]
ldmpc regs=r4
|
