| /*************************************************************************** |
| * __________ __ ___. |
| * 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 |