/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 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" .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, 0xf0008000 rts .wc_end: .size lcd_write_command,.wc_end-lcd_write_command .align 2 .global lcd_write_command_ex .type lcd_write_command_ex,@function lcd_write_command_ex: lea.l 0xf0008000, %a0 move.l (4, %sp), %d0 /* Command */ move.w %d0, (%a0)+ /* Write to LCD, set A0 = 1 */ move.l (8, %sp), %d0 /* Data */ cmp.l #-1, %d0 /* -1? */ beq.b .last move.w %d0, (%a0) /* Write to LCD */ move.l (12, %sp), %d0 /* Data */ cmp.l #-1, %d0 /* -1? */ beq.b .last move.w %d0, (%a0) /* Write to LCD */ .last: rts .wcex_end: .size lcd_write_command_ex,.wcex_end-lcd_write_command_ex .align 2 .global lcd_write_data .type lcd_write_data,@function lcd_write_data: movem.l (4, %sp), %a0-%a1 /* Data pointer */ move.l %a1, %d0 /* Length */ lea 0xf0008002, %a1 .loop: /* When running in IRAM, this loop takes 10 cycles plus the LCD write. The 10 cycles are necessary to follow the LCD timing specs at 140MHz */ nop /* 3(0/0) */ move.b (%a0)+, %d1 /* 3(1/0) */ move.w %d1, (%a1) /* 1(0/1) */ subq.l #1, %d0 /* 1(0/0) */ bne .loop /* 2(0/0) */ rts .wd_end: .size lcd_write_data,.wd_end-lcd_write_data .align 2 .global lcd_grey_data .type lcd_grey_data,@function /* The main loop assumes the buffers are in SDRAM. Otherwise the LCD * controller timing won't be met at 124 MHz and graphical glitches * will occur. */ lcd_grey_data: lea.l (-10*4, %sp), %sp movem.l %d2-%d6/%a2-%a6, (%sp) /* free some registers */ movem.l (10*4+4, %sp), %a0-%a2 /* values, phases, length */ lea.l (%a1, %a2.l*4), %a2 /* end address */ lea 0xf0008002, %a3 /* LCD data port */ moveq.l #15, %d3 add.l %a1, %d3 and.l #0xfffffff0, %d3 /* first line bound */ move.l %a2, %d1 and.l #0xfffffff0, %d1 /* last line bound */ cmp.l %d3, %d1 bls.w .g_tloop /* no lines to copy - jump to tail loop */ cmp.l %a1, %d0 bls.s .g_lloop /* no head blocks - jump to line loop */ .g_hloop: move.l (%a1), %d2 /* fetch 4 pixel phases */ bclr.l #31, %d2 /* Z = !(p0 & 0x80); p0 &= ~0x80; */ seq.b %d0 /* %d0 = ........................00000000 */ lsl.l #2, %d0 /* %d0 = ......................00000000.. */ bclr.l #23, %d2 /* Z = !(p1 & 0x80); p1 &= ~0x80; */ seq.b %d0 /* %d0 = ......................0011111111 */ lsl.l #2, %d0 /* %d0 = ....................0011111111.. */ bclr.l #15, %d2 /* Z = !(p2 & 0x80); p2 &= ~0x80; */ seq.b %d0 /* %d0 = ....................001122222222 */ lsl.l #2, %d0 /* %d0 = ..................001122222222.. */ bclr.l #7, %d2 /* Z = !(p3 & 0x80); p3 &= ~0x80; */ seq.b %d0 /* %d0 = ..................00112233333333 */ lsr.l #6, %d0 /* %d0 = ........................00112233 */ move.w %d0, (%a3) /* write pixel block */ add.l (%a0)+, %d2 /* add 4 pixel values to the phases */ move.l %d2, (%a1)+ /* store new phases, advance pointer */ cmp.l %a1, %d3 /* go up to first line bound */ bhi.s .g_hloop .g_lloop: movem.l (%a1), %d2-%d5 /* fetch 4 blocks of 4 pixel phases each */ bclr.l #31, %d2 /* calculate first pixel block */ seq.b %d0 lsl.l #2, %d0 bclr.l #23, %d2 seq.b %d0 lsl.l #2, %d0 bclr.l #15, %d2 seq.b %d0 lsl.l #2, %d0 bclr.l #7, %d2 seq.b %d0 lsr.l #6, %d0 move.w %d0, (%a3) /* write first block to LCD */ bclr.l #31, %d3 /* calculate second pixel block */ seq.b %d6 lsl.l #2, %d6 bclr.l #23, %d3 seq.b %d6 lsl.l #2, %d6 bclr.l #15, %d3 seq.b %d6 lsl.l #2, %d6 bclr.l #7, %d3 seq.b %d6 lsr.l #6, %d6 bclr.l #31, %d4 /* calculate third pixel block */ seq.b %d0 lsl.l #2, %d0 bclr.l #23, %d4 seq.b %d0 lsl.l #2, %d0 bclr.l #15, %d4 seq.b %d0 lsl.l #2, %d0 bclr.l #7, %d4 seq.b %d0 lsr.l #6, %d0 move.w %d6, (%a3) /* write second block to LCD */ movem.l (%a0), %d6/%a4-%a6 /* fetch 4 blocks of 4 pixel values each */ lea.l (16, %a0), %a0 move.w %d0, (%a3) /* write third block to LCD */ bclr.l #31, %d5 /* calculate fourth pixel block */ seq.b %d0 lsl.l #2, %d0 bclr.l #23, %d5 seq.b %d0 lsl.l #2, %d0 bclr.l #15, %d5 seq.b %d0 lsl.l #2, %d0 bclr.l #7, %d5 seq.b %d0 lsr.l #6, %d0 add.l %d6, %d2 /* calculate 4*4 new pixel phases */ add.l %a4, %d3 /* (packed addition) */ add.l %a5, %d4 add.l %a6, %d5 movem.l %d2-%d5, (%a1) /* store 4*4 new pixel phases */ lea.l (16, %a1), %a1 move.w %d0, (%a3) /* write fourth block to LCD */ cmp.l %a1, %d1 /* go up to last line bound */ bhi.w .g_lloop cmp.l %a1, %a2 bls.s .g_no_tail .g_tloop: move.l (%a1), %d2 bclr.l #31, %d2 seq.b %d0 lsl.l #2, %d0 bclr.l #23, %d2 seq.b %d0 lsl.l #2, %d0 bclr.l #15, %d2 seq.b %d0 lsl.l #2, %d0 bclr.l #7, %d2 seq.b %d0 lsr.l #6, %d0 move.w %d0, (%a3) add.l (%a0)+, %d2 /* go up to end address */ move.l %d2, (%a1)+ cmp.l %a1, %a2 bhi.s .g_tloop .g_no_tail: movem.l (%sp), %d2-%d6/%a2-%a6 /* restore registers */ lea.l (10*4, %sp), %sp rts .gd_end: .size lcd_grey_data,.gd_end-lcd_grey_data