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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Jens Arnold
*
* 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"
#include "cpu.h"
.section .icode,"ax",@progbits
.align 2
.global lcd_write_command
.type lcd_write_command,@function
lcd_write_command:
move.l (4, %sp), %d0
move.w %d0, 0xf0008000
rts
.wc_end:
.size lcd_write_command,.wc_end-lcd_write_command
.align 2
.global lcd_write_command_ex
.type lcd_write_command_ex,@function
lcd_write_command_ex:
lea.l 0xf0008000, %a0
move.l (4, %sp), %d0 /* Command */
move.w %d0, (%a0)+ /* Write to LCD, set A0 = 1 */
move.l (8, %sp), %d0 /* Data */
cmp.l #-1, %d0 /* -1? */
beq.b .last
move.w %d0, (%a0) /* Write to LCD */
move.l (12, %sp), %d0 /* Data */
cmp.l #-1, %d0 /* -1? */
beq.b .last
move.w %d0, (%a0) /* Write to LCD */
.last:
rts
.wcex_end:
.size lcd_write_command_ex,.wcex_end-lcd_write_command_ex
.align 2
.global lcd_write_data
.type lcd_write_data,@function
lcd_write_data:
movem.l (4, %sp), %a0-%a1 /* Data pointer */
move.l %a1, %d0 /* Length */
lea 0xf0008002, %a1
.loop:
/* When running in IRAM, this loop takes 10 cycles plus the LCD write.
The 10 cycles are necessary to follow the LCD timing specs
at 140MHz */
nop /* 3(0/0) */
move.b (%a0)+, %d1 /* 3(1/0) */
move.w %d1, (%a1) /* 1(0/1) */
subq.l #1, %d0 /* 1(0/0) */
bne .loop /* 2(0/0) */
rts
.wd_end:
.size lcd_write_data,.wd_end-lcd_write_data
.align 2
.global lcd_grey_data
.type lcd_grey_data,@function
/* The main loop assumes the buffers are in SDRAM. Otherwise the LCD
* controller timing won't be met at 124 MHz and graphical glitches
* will occur. */
lcd_grey_data:
lea.l (-10*4, %sp), %sp
movem.l %d2-%d6/%a2-%a6, (%sp) /* free some registers */
movem.l (10*4+4, %sp), %a0-%a2 /* values, phases, length */
lea.l (%a1, %a2.l*4), %a2 /* end address */
lea 0xf0008002, %a3 /* LCD data port */
moveq.l #15, %d3
add.l %a1, %d3
and.l #0xfffffff0, %d3 /* first line bound */
move.l %a2, %d1
and.l #0xfffffff0, %d1 /* last line bound */
cmp.l %d3, %d1
bls.w .g_tloop /* no lines to copy - jump to tail loop */
cmp.l %a1, %d0
bls.s .g_lloop /* no head blocks - jump to line loop */
.g_hloop:
move.l (%a1), %d2 /* fetch 4 pixel phases */
bclr.l #31, %d2 /* Z = !(p0 & 0x80); p0 &= ~0x80; */
seq.b %d0 /* %d0 = ........................00000000 */
lsl.l #2, %d0 /* %d0 = ......................00000000.. */
bclr.l #23, %d2 /* Z = !(p1 & 0x80); p1 &= ~0x80; */
seq.b %d0 /* %d0 = ......................0011111111 */
lsl.l #2, %d0 /* %d0 = ....................0011111111.. */
bclr.l #15, %d2 /* Z = !(p2 & 0x80); p2 &= ~0x80; */
seq.b %d0 /* %d0 = ....................001122222222 */
lsl.l #2, %d0 /* %d0 = ..................001122222222.. */
bclr.l #7, %d2 /* Z = !(p3 & 0x80); p3 &= ~0x80; */
seq.b %d0 /* %d0 = ..................00112233333333 */
lsr.l #6, %d0 /* %d0 = ........................00112233 */
move.w %d0, (%a3) /* write pixel block */
add.l (%a0)+, %d2 /* add 4 pixel values to the phases */
move.l %d2, (%a1)+ /* store new phases, advance pointer */
cmp.l %a1, %d3 /* go up to first line bound */
bhi.s .g_hloop
.g_lloop:
movem.l (%a1), %d2-%d5 /* fetch 4 blocks of 4 pixel phases each */
bclr.l #31, %d2 /* calculate first pixel block */
seq.b %d0
lsl.l #2, %d0
bclr.l #23, %d2
seq.b %d0
lsl.l #2, %d0
bclr.l #15, %d2
seq.b %d0
lsl.l #2, %d0
bclr.l #7, %d2
seq.b %d0
lsr.l #6, %d0
move.w %d0, (%a3) /* write first block to LCD */
bclr.l #31, %d3 /* calculate second pixel block */
seq.b %d6
lsl.l #2, %d6
bclr.l #23, %d3
seq.b %d6
lsl.l #2, %d6
bclr.l #15, %d3
seq.b %d6
lsl.l #2, %d6
bclr.l #7, %d3
seq.b %d6
lsr.l #6, %d6
bclr.l #31, %d4 /* calculate third pixel block */
seq.b %d0
lsl.l #2, %d0
bclr.l #23, %d4
seq.b %d0
lsl.l #2, %d0
bclr.l #15, %d4
seq.b %d0
lsl.l #2, %d0
bclr.l #7, %d4
seq.b %d0
lsr.l #6, %d0
move.w %d6, (%a3) /* write second block to LCD */
movem.l (%a0), %d6/%a4-%a6 /* fetch 4 blocks of 4 pixel values each */
lea.l (16, %a0), %a0
move.w %d0, (%a3) /* write third block to LCD */
bclr.l #31, %d5 /* calculate fourth pixel block */
seq.b %d0
lsl.l #2, %d0
bclr.l #23, %d5
seq.b %d0
lsl.l #2, %d0
bclr.l #15, %d5
seq.b %d0
lsl.l #2, %d0
bclr.l #7, %d5
seq.b %d0
lsr.l #6, %d0
add.l %d6, %d2 /* calculate 4*4 new pixel phases */
add.l %a4, %d3 /* (packed addition) */
add.l %a5, %d4
add.l %a6, %d5
movem.l %d2-%d5, (%a1) /* store 4*4 new pixel phases */
lea.l (16, %a1), %a1
move.w %d0, (%a3) /* write fourth block to LCD */
cmp.l %a1, %d1 /* go up to last line bound */
bhi.w .g_lloop
cmp.l %a1, %a2
bls.s .g_no_tail
.g_tloop:
move.l (%a1), %d2
bclr.l #31, %d2
seq.b %d0
lsl.l #2, %d0
bclr.l #23, %d2
seq.b %d0
lsl.l #2, %d0
bclr.l #15, %d2
seq.b %d0
lsl.l #2, %d0
bclr.l #7, %d2
seq.b %d0
lsr.l #6, %d0
move.w %d0, (%a3)
add.l (%a0)+, %d2 /* go up to end address */
move.l %d2, (%a1)+
cmp.l %a1, %a2
bhi.s .g_tloop
.g_no_tail:
movem.l (%sp), %d2-%d6/%a2-%a6 /* restore registers */
lea.l (10*4, %sp), %sp
rts
.gd_end:
.size lcd_grey_data,.gd_end-lcd_grey_data
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