88baa4d4c7
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25767 a1c6a512-1295-4272-9138-f99709370657
179 lines
6.7 KiB
ArmAsm
179 lines
6.7 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 LCD_BASE_ADDRESS+2, %a1 /* LCD data port address */
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btst #0, %d0 /* longwords multiply? */
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beq .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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beq .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 .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 (-2*4, %sp), %sp
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movem.l %a2-%a3, (%sp)
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movem.l (2*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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.ph_loop:
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clr.l %d1
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move.l (%a1), %d0 /* fetch 4 pixel phases */
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bclr.l #31, %d0 /* Z = !(p0 & 0x80); p0 &= ~0x80; */
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seq.b %d1 /* %d1 = ........................00000000 */
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lsl.l #1, %d1 /* %d1 = .......................00000000. */
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bclr.l #23, %d0 /* Z = !(p1 & 0x80); p1 &= ~0x80; */
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seq.b %d1 /* %d1 = .......................011111111 */
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lsl.l #1, %d1 /* %d1 = ......................011111111. */
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bclr.l #15, %d0 /* Z = !(p2 & 0x80); p2 &= ~0x80; */
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seq.b %d1 /* %d1 = ......................0122222222 */
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lsl.l #1, %d1 /* %d1 = .....................0122222222. */
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bclr.l #7, %d0 /* Z = !(p3 & 0x80); p3 &= ~0x80; */
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seq.b %d1 /* %d1 = .....................01233333333 */
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lsl.l #1, %d1 /* %d1 = ....................01233333333. */
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add.l (%a0)+, %d0 /* add 4 pixel values to the phases */
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move.l %d0, (%a1)+ /* store new phases, advance pointer */
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clr.l %d1
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move.l (%a1), %d0 /* fetch 4 pixel phases */
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bclr.l #31, %d0 /* Z = !(p0 & 0x80); p0 &= ~0x80; */
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seq.b %d1 /* %d1 = ....................012344444444 */
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lsl.l #1, %d1 /* %d1 = ...................012344444444. */
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bclr.l #23, %d0 /* Z = !(p1 & 0x80); p1 &= ~0x80; */
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seq.b %d1 /* %d1 = ...................0123455555555 */
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lsl.l #1, %d1 /* %d1 = ..................0123455555555. */
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bclr.l #15, %d0 /* Z = !(p2 & 0x80); p2 &= ~0x80; */
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seq.b %d1 /* %d1 = ..................01234566666666 */
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lsl.l #1, %d1 /* %d1 = .................01234566666666. */
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bclr.l #7, %d0 /* Z = !(p3 & 0x80); p3 &= ~0x80; */
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seq.b %d1 /* %d1 = .................012345677777777 */
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lsr.l #7, %d1 /* %d1 = ........................01234567 */
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add.l (%a0)+, %d0 /* add 4 pixel values to the phases */
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move.l %d0, (%a1)+ /* store new phases, advance pointer */
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move.w %d1, (%a3) /* transfer to lcd */
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move.w %d1, (%a3) /* transfer to lcd */
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cmp.l %a2, %a1
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bls .ph_loop
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movem.l (%sp), %a2-%a3
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lea.l (2*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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