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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id:$
*
* Copyright (C) 2010 Marcin Bukat
* based on lcd-as-m3.S 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"
#define LCD_BASE_ADDRESS 0xf0000000
.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, LCD_BASE_ADDRESS /* data is 1byte but CF uses word
* transfers only */
rts
.wc_end:
.size lcd_write_command,.wc_end-lcd_write_command
.align 2
.global lcd_write_command_e
.type lcd_write_command_e,@function
lcd_write_command_e:
lea.l LCD_BASE_ADDRESS, %a0
move.l (4, %sp), %d0 /* Command */
move.w %d0, (%a0)
move.l (8, %sp), %d0 /* Data */
move.w %d0, (%a0) /* Write to LCD */
rts
.wce_end:
.size lcd_write_command_e,.wce_end-lcd_write_command_e
.align 2
.global lcd_write_data
.type lcd_write_data,@function
/* PIXELFORMAT = VERTICAL_INTERLEAVED
* this means that data is packed verticaly in 8 pixels columns
* first byte is lsb of 2bit color in column
* second byte is msb of 2bit color in column
* so one word of data equals 8 pixels i 2bits color depth packed
* verticaly
*/
lcd_write_data:
movem.l (4, %sp), %a0 /* Data pointer */
move.l (8, %sp), %d0 /* Length i in words */
lea.l LCD_BASE_ADDRESS+2, %a1 /* LCD data port address */
btst #0, %d0 /* longwords multiply? */
jeq .l_write
.w_write:
move.w (%a0)+, %d1 /* load data 3 cycles*/
move.w %d1, (%a1) /* first byte 1 cycle*/
lsr.l #8, %d1 /* load second byte 1 cycle*/
move.w %d1, (%a1) /* transfer 1 cycle*/
subq.l #1, %d0 /* decrement counter 1 cycle*/
jeq .write_end
.l_write:
move.l (%a0)+, %d1 /* load data 2 cycles*/
swap %d1 /* 1 cycle */
move.w %d1, (%a1) /* first byte 1 cycle*/
lsr.l #8, %d1 /* 1 cycle */
move.w %d1, (%a1) /* second byte 1 cycle*/
lsr.l #8, %d1 /* 1 cycle */
move.w %d1, (%a1) /* third byte 1 cycle*/
lsr.l #8, %d1 /* 1 cycle */
move.w %d1, (%a1) /* forth byte 1 cycle*/
subq.l #2, %d0 /* decrement counter 1 cycle*/
bne.s .l_write
.write_end:
rts
.wd_end:
.size lcd_write_data,.wd_end-lcd_write_data
.global lcd_mono_data
.type lcd_mono_data, @function
lcd_mono_data:
move.l (4, %sp), %a0 /* p_bytes */
move.l (8, %sp), %d0 /* count */
lea.l LCD_BASE_ADDRESS+2, %a1 /* LCD data port address */
.md_loop:
move.b (%a0)+, %d1
move.w %d1, (%a1) /* byte transfers actually */
move.w %d1, (%a1)
subq.l #1, %d0
bne.s .md_loop
rts
.md_end:
.size lcd_mono_data,.md_end-lcd_mono_data
.global lcd_grey_data
.type lcd_grey_data,@function
lcd_grey_data:
lea.l (-6*4, %sp), %sp
movem.l %d2-%d5/%a2-%a3, (%sp)
movem.l (6*4+4, %sp), %a0-%a2 /* values, phases, length */
add.l %a2, %a2
lea.l (%a1, %a2.l*4), %a2 /* end address */
lea.l LCD_BASE_ADDRESS+2, %a3 /* LCD data port address */
moveq.l #24, %d4 /* shift count */
move.l #0x204081, %d5 /* bit shuffle factor */
.ph_loop:
movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */
move.l %d0, %d2
and.l #0x80808080, %d2 /* %d2 = 0.......1.......2.......3....... */
eor.l %d2, %d0
add.l (%a0)+, %d0 /* add values to first 4 phases */
move.l %d1, %d3
and.l #0x80808080, %d3 /* %d3 = 4.......5.......6.......7....... */
eor.l %d3, %d1
add.l (%a0)+, %d1 /* add values to second 4 phases */
lsr.l #4, %d3 /* %d3 = ....4.......5.......6.......7... */
or.l %d3, %d2 /* %d2 = 0...4...1...5...2...6...3...7... */
mulu.l %d5, %d2 /* %d2 = 01234567123.567.23..67..3...7... */
not.l %d2 /* negate bits */
lsr.l %d4, %d2 /* %d2 = ........................01234567 */
move.w %d2, (%a3) /* transfer first LCD byte */
movem.l %d0-%d1, (%a1) /* store 8 new pixel phases */
addq.l #8, %a1
move.w %d2, (%a3) /* transfer second LCD byte */
cmp.l %a2, %a1
bls.s .ph_loop
movem.l (%sp), %d2-%d5/%a2-%a3
lea.l (6*4, %sp), %sp
rts
.grey_end:
.size lcd_grey_data,.grey_end-lcd_grey_data
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