f053b0d606
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26793 a1c6a512-1295-4272-9138-f99709370657
169 lines
5.5 KiB
ArmAsm
169 lines
5.5 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id:$
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*
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* Copyright (C) 2010 Marcin Bukat
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* based on lcd-as-m3.S by Jens Arnold
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#define LCD_BASE_ADDRESS 0xf0000000
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.section .icode,"ax",@progbits
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.align 2
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.global lcd_write_command
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.type lcd_write_command,@function
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lcd_write_command:
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move.l (4, %sp), %d0
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move.w %d0, LCD_BASE_ADDRESS /* data is 1byte but CF uses word
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* transfers only */
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rts
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.wc_end:
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.size lcd_write_command,.wc_end-lcd_write_command
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.align 2
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.global lcd_write_command_e
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.type lcd_write_command_e,@function
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lcd_write_command_e:
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lea.l LCD_BASE_ADDRESS, %a0
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move.l (4, %sp), %d0 /* Command */
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move.w %d0, (%a0)
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move.l (8, %sp), %d0 /* Data */
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move.w %d0, (%a0) /* Write to LCD */
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rts
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.wce_end:
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.size lcd_write_command_e,.wce_end-lcd_write_command_e
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.align 2
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.global lcd_write_data
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.type lcd_write_data,@function
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/* PIXELFORMAT = VERTICAL_INTERLEAVED
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* this means that data is packed verticaly in 8 pixels columns
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* first byte is lsb of 2bit color in column
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* second byte is msb of 2bit color in column
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* so one word of data equals 8 pixels i 2bits color depth packed
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* verticaly
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*/
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lcd_write_data:
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movem.l (4, %sp), %a0 /* Data pointer */
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move.l (8, %sp), %d0 /* Length i in words */
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lea.l LCD_BASE_ADDRESS+2, %a1 /* LCD data port address */
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btst #0, %d0 /* longwords multiply? */
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jeq .l_write
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.w_write:
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move.w (%a0)+, %d1 /* load data 3 cycles*/
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move.w %d1, (%a1) /* first byte 1 cycle*/
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lsr.l #8, %d1 /* load second byte 1 cycle*/
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move.w %d1, (%a1) /* transfer 1 cycle*/
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subq.l #1, %d0 /* decrement counter 1 cycle*/
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jeq .write_end
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.l_write:
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move.l (%a0)+, %d1 /* load data 2 cycles*/
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swap %d1 /* 1 cycle */
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move.w %d1, (%a1) /* first byte 1 cycle*/
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lsr.l #8, %d1 /* 1 cycle */
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move.w %d1, (%a1) /* second byte 1 cycle*/
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lsr.l #8, %d1 /* 1 cycle */
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move.w %d1, (%a1) /* third byte 1 cycle*/
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lsr.l #8, %d1 /* 1 cycle */
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move.w %d1, (%a1) /* forth byte 1 cycle*/
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subq.l #2, %d0 /* decrement counter 1 cycle*/
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bne.s .l_write
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.write_end:
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rts
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.wd_end:
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.size lcd_write_data,.wd_end-lcd_write_data
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.global lcd_mono_data
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.type lcd_mono_data, @function
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lcd_mono_data:
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move.l (4, %sp), %a0 /* p_bytes */
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move.l (8, %sp), %d0 /* count */
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lea.l LCD_BASE_ADDRESS+2, %a1 /* LCD data port address */
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.md_loop:
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move.b (%a0)+, %d1
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move.w %d1, (%a1) /* byte transfers actually */
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move.w %d1, (%a1)
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subq.l #1, %d0
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bne.s .md_loop
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rts
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.md_end:
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.size lcd_mono_data,.md_end-lcd_mono_data
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.global lcd_grey_data
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.type lcd_grey_data,@function
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lcd_grey_data:
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lea.l (-6*4, %sp), %sp
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movem.l %d2-%d5/%a2-%a3, (%sp)
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movem.l (6*4+4, %sp), %a0-%a2 /* values, phases, length */
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add.l %a2, %a2
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lea.l (%a1, %a2.l*4), %a2 /* end address */
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lea.l LCD_BASE_ADDRESS+2, %a3 /* LCD data port address */
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moveq.l #24, %d4 /* shift count */
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move.l #0x204081, %d5 /* bit shuffle factor */
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.ph_loop:
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movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */
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move.l %d0, %d2
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and.l #0x80808080, %d2 /* %d2 = 0.......1.......2.......3....... */
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eor.l %d2, %d0
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add.l (%a0)+, %d0 /* add values to first 4 phases */
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move.l %d1, %d3
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and.l #0x80808080, %d3 /* %d3 = 4.......5.......6.......7....... */
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eor.l %d3, %d1
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add.l (%a0)+, %d1 /* add values to second 4 phases */
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lsr.l #4, %d3 /* %d3 = ....4.......5.......6.......7... */
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or.l %d3, %d2 /* %d2 = 0...4...1...5...2...6...3...7... */
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mulu.l %d5, %d2 /* %d2 = 01234567123.567.23..67..3...7... */
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not.l %d2 /* negate bits */
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lsr.l %d4, %d2 /* %d2 = ........................01234567 */
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move.w %d2, (%a3) /* transfer first LCD byte */
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movem.l %d0-%d1, (%a1) /* store 8 new pixel phases */
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addq.l #8, %a1
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move.w %d2, (%a3) /* transfer second LCD byte */
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cmp.l %a2, %a1
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bls.s .ph_loop
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movem.l (%sp), %d2-%d5/%a2-%a3
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lea.l (6*4, %sp), %sp
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rts
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.grey_end:
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.size lcd_grey_data,.grey_end-lcd_grey_data
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