2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
320 lines
8.4 KiB
ArmAsm
320 lines
8.4 KiB
ArmAsm
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2008 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"
|
|
|
|
#define RS_MASK 0x00010000
|
|
#define CLOCK_MASK 0x10000000
|
|
#define GPIO_OUT_ADDR 0x80000004
|
|
|
|
#define CS_MASK 0x00000004 /* used in moveq.l */
|
|
#define DATA_MASK 0x00040000
|
|
#define GPIO1_OUT_ADDR 0x800000b4
|
|
|
|
#define CS_TIMEOUT 10 /* HZ/10 */
|
|
|
|
.extern cpu_frequency /* Global variable from system.c */
|
|
.extern remote_byte_delay /* Global variable from lcd-remote-iriver.c */
|
|
.extern remote_cs_countdown /* Global variable from lcd-remote-iriver.c */
|
|
|
|
.section .icode,"ax",@progbits
|
|
|
|
/* Output 8 bits to the LCD. Instruction order is devised to maximize the
|
|
* delay between changing the data line and the CLK L->H transition, which
|
|
* makes the LCD controller sample DATA.
|
|
* Requires CLK = 0 on entry.
|
|
*
|
|
* Custom calling convention:
|
|
* %a0 - GPIO_OUT_ADDR
|
|
* %a1 - GPIO1_OUT_ADDR
|
|
* %d4 - data byte
|
|
* %d6 - DATA_MASK
|
|
* Clobbers:
|
|
* %d0..%d4
|
|
*/
|
|
#ifdef HAVE_REMOTE_LCD_TICKING
|
|
.write_byte_delayed:
|
|
move.l remote_byte_delay, %d0
|
|
1:
|
|
subq.l #1, %d0
|
|
bne.s 1b
|
|
#endif
|
|
|
|
.write_byte:
|
|
move.w %sr, %d3 /* Get current interrupt level */
|
|
move.w #0x2700, %sr /* Disable interrupts */
|
|
|
|
move.l (%a1), %d0 /* Get current state of data port */
|
|
move.l %d0, %d1
|
|
and.l %d6, %d1 /* Check current state of data line */
|
|
beq.s 1f /* and set it as previous-state bit */
|
|
bset #8, %d4
|
|
1:
|
|
move.l %d4, %d1 /* Compute the 'bit derivative', i.e. a value */
|
|
lsr.l #1, %d1 /* with 1's where the data changes from the */
|
|
eor.l %d1, %d4 /* previous state, and 0's where it doesn't */
|
|
swap %d4 /* Shift data to upper byte */
|
|
lsl.l #8, %d4
|
|
|
|
move.l (%a0),%d1 /* Get current state of clock port */
|
|
move.l %d1, %d2 /* Precalculate opposite state of clock line */
|
|
eor.l #CLOCK_MASK, %d2
|
|
|
|
lsl.l #1, %d4 /* Invert data line for bit7 ? */
|
|
bcc.s 1f /* no: skip */
|
|
eor.l %d6, %d0 /* invert data bit */
|
|
move.l %d0, (%a1) /* output data bit7 */
|
|
nop
|
|
nop
|
|
1:
|
|
|
|
.macro bit_out
|
|
move.l %d2, (%a0) /* Bit7: set CLK = 1 */
|
|
nop
|
|
lsl.l #1, %d4 /* Invert data line for bit6 ? */
|
|
bcc.s 1f /* no: skip */
|
|
eor.l %d6, %d0 /* Invert data bit */
|
|
move.l %d1, (%a0) /* set CLK = 0 */
|
|
move.l %d0, (%a1) /* Output data bit6 */
|
|
.word 0x51fa /* trapf.w - shadow next insn */
|
|
1:
|
|
move.l %d1, (%a0) /* set CLK = 0 */
|
|
.endm
|
|
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
bit_out
|
|
nop
|
|
nop
|
|
|
|
move.l %d2, (%a0) /* Bit0: Set CLK = 1 */
|
|
nop
|
|
nop
|
|
move.l %d1, (%a0) /* Set CLK = 0 */
|
|
|
|
move.w %d3, %sr /* Restore interrupt level */
|
|
rts
|
|
|
|
/* Output 8 bits to the LCD as fast as possible. Use only at < 60MHz.
|
|
*
|
|
* Custom calling convention:
|
|
* %a0 - GPIO_OUT_ADDR
|
|
* %a1 - GPIO1_OUT_ADDR
|
|
* %d4 - data word
|
|
* %d6 - DATA_MASK
|
|
* Clobbers:
|
|
* %d0..%d4
|
|
*/
|
|
#ifdef HAVE_REMOTE_LCD_TICKING
|
|
.write_byte_fast_delayed:
|
|
move.l remote_byte_delay, %d0
|
|
1:
|
|
subq.l #1, %d0
|
|
bne.s 1b
|
|
#endif
|
|
|
|
.write_byte_fast:
|
|
move.w %sr, %d3 /* Get current interrupt level */
|
|
move.w #0x2700,%sr /* Disable interrupts */
|
|
|
|
move.l (%a1), %d0 /* Get current state of data port */
|
|
move.l %d0, %d1
|
|
and.l %d6, %d1 /* Check current state of data line */
|
|
beq.s 1f /* and set it as previous-state bit */
|
|
bset #8, %d4
|
|
1:
|
|
move.l %d4, %d1 /* Compute the 'bit derivative', i.e. a value */
|
|
lsr.l #1, %d1 /* with 1's where the data changes from the */
|
|
eor.l %d1, %d4 /* previous state, and 0's where it doesn't */
|
|
swap %d4 /* Shift data to upper byte */
|
|
lsl.l #8, %d4
|
|
|
|
move.l (%a0), %d1 /* Get current state of clock port */
|
|
move.l %d1, %d2 /* Precalculate opposite state of clock line */
|
|
eor.l #CLOCK_MASK, %d2
|
|
|
|
.macro bit_out_fast
|
|
lsl.l #1,%d4 /* Shift out MSB */
|
|
bcc.s 1f
|
|
eor.l %d6, %d0 /* 1: flip data bit */
|
|
move.l %d0, (%a1) /* and output new DATA state */
|
|
1:
|
|
move.l %d2, (%a0) /* Set CLK */
|
|
move.l %d1, (%a0) /* Reset CLK */
|
|
.endm
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
bit_out_fast
|
|
|
|
move.w %d3, %sr /* Restore interrupt level */
|
|
rts
|
|
|
|
|
|
.global lcd_remote_write_command
|
|
.type lcd_remote_write_command, @function
|
|
|
|
lcd_remote_write_command:
|
|
lea.l (-4*4, %sp), %sp
|
|
movem.l %d2-%d4/%d6, (%sp)
|
|
|
|
move.l (4*4+4, %sp), %d4 /* cmd */
|
|
|
|
lea.l GPIO_OUT_ADDR, %a0
|
|
lea.l GPIO1_OUT_ADDR, %a1
|
|
move.l #DATA_MASK, %d6
|
|
|
|
clr.l remote_cs_countdown
|
|
|
|
move.l #~RS_MASK, %d0
|
|
and.l %d0, (%a0)
|
|
moveq.l #~CS_MASK, %d0
|
|
and.l %d0, (%a1)
|
|
|
|
#ifdef HAVE_REMOTE_LCD_TICKING
|
|
tst.l remote_byte_delay
|
|
ble.s 1f
|
|
bsr.w .write_byte_delayed
|
|
bra.s 2f
|
|
1:
|
|
#endif
|
|
bsr.w .write_byte
|
|
2:
|
|
|
|
moveq.l #CS_TIMEOUT, %d0
|
|
move.l %d0, remote_cs_countdown
|
|
|
|
movem.l (%sp), %d2-%d4/%d6
|
|
lea.l (4*4, %sp), %sp
|
|
rts
|
|
|
|
|
|
.global lcd_remote_write_command_ex
|
|
.type lcd_remote_write_command_ex, @function
|
|
|
|
lcd_remote_write_command_ex:
|
|
lea.l (-4*4, %sp), %sp
|
|
movem.l %d2-%d4/%d6, (%sp)
|
|
|
|
lea.l GPIO_OUT_ADDR, %a0
|
|
lea.l GPIO1_OUT_ADDR, %a1
|
|
move.l #DATA_MASK, %d6
|
|
|
|
clr.l remote_cs_countdown
|
|
|
|
move.l #~RS_MASK, %d0
|
|
and.l %d0, (%a0)
|
|
moveq.l #~CS_MASK, %d0
|
|
and.l %d0, (%a1)
|
|
|
|
move.l (4*4+4, %sp), %d4
|
|
|
|
#ifdef HAVE_REMOTE_LCD_TICKING
|
|
tst.l remote_byte_delay
|
|
ble.s 1f
|
|
bsr.w .write_byte_delayed
|
|
move.l (4*4+8, %sp), %d4
|
|
bsr.w .write_byte_delayed
|
|
bra.s 2f
|
|
1:
|
|
#endif
|
|
bsr.w .write_byte
|
|
move.l (4*4+8, %sp), %d4
|
|
bsr.w .write_byte
|
|
2:
|
|
|
|
moveq.l #CS_TIMEOUT, %d0
|
|
move.l %d0, remote_cs_countdown
|
|
|
|
movem.l (%sp), %d2-%d4/%d6
|
|
lea.l (4*4, %sp), %sp
|
|
rts
|
|
|
|
|
|
.global lcd_remote_write_data
|
|
.type lcd_remote_write_data, @function
|
|
|
|
lcd_remote_write_data:
|
|
lea.l (-7*4, %sp), %sp
|
|
movem.l %d2-%d6/%a2-%a3, (%sp)
|
|
|
|
move.l (7*4+4, %sp), %a2 /* p_bytes */
|
|
move.l (7*4+8, %sp), %d5 /* count */
|
|
|
|
lea.l GPIO_OUT_ADDR, %a0
|
|
lea.l GPIO1_OUT_ADDR, %a1
|
|
move.l #DATA_MASK, %d6
|
|
|
|
lea.l .write_byte, %a3
|
|
move.l cpu_frequency, %d0
|
|
cmp.l #60000000, %d0
|
|
bhi.b 1f
|
|
lea.l .write_byte_fast, %a3
|
|
1:
|
|
|
|
#ifdef HAVE_REMOTE_LCD_TICKING
|
|
tst.l remote_byte_delay
|
|
ble.s 1f
|
|
moveq.l #(.write_byte_delayed - .write_byte), %d0
|
|
add.l %d0, %a3
|
|
1:
|
|
#endif
|
|
|
|
clr.l remote_cs_countdown
|
|
|
|
move.l #RS_MASK, %d0
|
|
or.l %d0, (%a0)
|
|
moveq.l #~CS_MASK, %d0
|
|
and.l %d0, (%a1)
|
|
|
|
.wd_loop:
|
|
clr.l %d4
|
|
move.b (%a2)+, %d4
|
|
jsr (%a3)
|
|
subq.l #1, %d5
|
|
bne.s .wd_loop
|
|
|
|
moveq.l #CS_TIMEOUT, %d0
|
|
move.l %d0, remote_cs_countdown
|
|
|
|
movem.l (%sp), %d2-%d6/%a2-%a3
|
|
lea.l (7*4, %sp), %sp
|
|
rts
|