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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [ser_a2232fw.ax] - Rev 1774
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;.lib "axm";;begin;title "A2232 serial board driver";;set modules "2232";set executable "2232.bin";;;;;set nolink;;set temporary directory "t:";;set assembly options "-m6502 -l60:t:list";set link options "bin"; loadadr";;;bin2c 2232.bin msc6502.h msc6502code;end;;; ### Commodore A2232 serial board driver for NetBSD by JM v1.3 ###;; - Created 950501 by JM -;;; Serial board driver software.;;% Copyright (c) 1995 Jukka Marin <jmarin@jmp.fi>.% All rights reserved.%% Redistribution and use in source and binary forms, with or without% modification, are permitted provided that the following conditions% are met:% 1. Redistributions of source code must retain the above copyright% notice, and the entire permission notice in its entirety,% including the disclaimer of warranties.% 2. Redistributions in binary form must reproduce the above copyright% notice, this list of conditions and the following disclaimer in the% documentation and/or other materials provided with the distribution.% 3. The name of the author may not be used to endorse or promote% products derived from this software without specific prior% written permission.%% ALTERNATIVELY, this product may be distributed under the terms of% the GNU General Public License, in which case the provisions of the% GPL are required INSTEAD OF the above restrictions. (This clause is% necessary due to a potential bad interaction between the GPL and% the restrictions contained in a BSD-style copyright.)%% THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES% OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE% DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,% INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES% (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR% SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,% STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED% OF THE POSSIBILITY OF SUCH DAMAGE.;;; Bugs:;; - Can't send a break yet;;;; Edited:;; - 950501 by JM -> v0.1 - Created this file.; - 951029 by JM -> v1.3 - Carrier Detect events now queued in a separate; queue.;;CODE equ $3800 ; start address for program codeCTL_CHAR equ $00 ; byte in ibuf is a characterCTL_EVENT equ $01 ; byte in ibuf is an eventEVENT_BREAK equ $01EVENT_CDON equ $02EVENT_CDOFF equ $03EVENT_SYNC equ $04XON equ $11XOFF equ $13VARBASE macro *starting_address ; was VARINIT_varbase set \1endmVARDEF macro *name space_needs\1 equ _varbase_varbase set _varbase+\2endmstz macro * addressdb $64,\1endmstzax macro * addressdb $9e,<\1,>\1endmbiti macro * immediate valuedb $89,\1endmsmb0 macro * addressdb $87,\1endmsmb1 macro * addressdb $97,\1endmsmb2 macro * addressdb $a7,\1endmsmb3 macro * addressdb $b7,\1endmsmb4 macro * addressdb $c7,\1endmsmb5 macro * addressdb $d7,\1endmsmb6 macro * addressdb $e7,\1endmsmb7 macro * addressdb $f7,\1endm;-----------------------------------------------------------------------;; ;; stuff common for all ports, non-critical (run once / loop) ;; ;DO_SLOW macro * port_number ;.local ; ;lda CIA+C_PA ; check all CD inputs ;cmp CommonCDo ; changed from previous accptd? ;beq =over ; nope, do nothing else here ;; ;cmp CommonCDb ; bouncing? ;beq =nobounce ; nope -> ;; ;sta CommonCDb ; save current state ;lda #64 ; reinitialize counter ;sta CommonCDc ; ;jmp =over ; skip CD save ;; ;=nobounce dec CommonCDc ; no, decrement bounce counter ;bpl =over ; not done yet, so skip CD save ;; ;=saveCD ldx CDHead ; get write index ;sta cdbuf,x ; save status in buffer ;inx ; ;cpx CDTail ; buffer full? ;.if ne ; no: preserve status: ;stx CDHead ; update index in RAM ;sta CommonCDo ; save state for the next check ;.end ; ;=over .end local ;endm ;;;-----------------------------------------------------------------------;; port specific stuff (no data transfer)DO_PORT macro * port_number.local ; ;lda SetUp\1 ; reconfiguration request? ;.if ne ; yes: ;lda SoftFlow\1 ; get XON/XOFF flag ;sta XonOff\1 ; save it ;lda Param\1 ; get parameter ;ora #%00010000 ; use baud generator for Rx ;sta ACIA\1+A_CTRL ; store in control register ;stz OutDisable\1 ; enable transmit output ;stz SetUp\1 ; no reconfiguration no more ;.end ; ;; ;lda InHead\1 ; get write index ;sbc InTail\1 ; buffer full soon? ;cmp #200 ; 200 chars or more in buffer? ;lda Command\1 ; get Command reg value ;and #%11110011 ; turn RTS OFF by default ;.if cc ; still room in buffer: ;ora #%00001000 ; turn RTS ON ;.end ; ;sta ACIA\1+A_CMD ; set/clear RTS ;; ;lda OutFlush\1 ; request to flush output buffer;.if ne ; yessh! ;lda OutHead\1 ; get head ;sta OutTail\1 ; save as tail ;stz OutDisable\1 ; enable transmit output ;stz OutFlush\1 ; clear request ;.end.end localendmDO_DATA macro * port number.locallda ACIA\1+A_SR ; read ACIA status register ;biti [1<<3] ; something received? ;.if ne ; yes: ;biti [1<<1] ; framing error? ;.if ne ; yes: ;lda ACIA\1+A_DATA ; read received character ;bne =SEND ; not break -> ignore it ;ldx InHead\1 ; get write pointer ;lda #CTL_EVENT ; get type of byte ;sta ictl\1,x ; save it in InCtl buffer ;lda #EVENT_BREAK ; event code ;sta ibuf\1,x ; save it as well ;inx ; ;cpx InTail\1 ; still room in buffer? ;.if ne ; absolutely: ;stx InHead\1 ; update index in memory ;.end ; ;jmp =SEND ; go check if anything to send ;.end ; ;; normal char received: ;ldx InHead\1 ; get write index ;lda ACIA\1+A_DATA ; read received character ;sta ibuf\1,x ; save char in buffer ;stzax ictl\1 ; set type to CTL_CHAR ;inx ; ;cpx InTail\1 ; buffer full? ;.if ne ; no: preserve character: ;stx InHead\1 ; update index in RAM ;.end ; ;and #$7f ; mask off parity if any ;cmp #XOFF ; XOFF from remote host? ;.if eq ; yes: ;lda XonOff\1 ; if XON/XOFF handshaking.. ;sta OutDisable\1 ; ..disable transmitter ;.end ; ;.end ; ;; ;; BUFFER FULL CHECK WAS HERE ;; ;=SEND lda ACIA\1+A_SR ; transmit register empty? ;and #[1<<4] ; ;.if ne ; yes: ;ldx OutCtrl\1 ; sending out XON/XOFF? ;.if ne ; yes: ;lda CIA+C_PB ; check CTS signal ;and #[1<<\1] ; (for this port only) ;bne =DONE ; not allowed to send -> done ;stx ACIA\1+A_DATA ; transmit control char ;stz OutCtrl\1 ; clear flag ;jmp =DONE ; and we're done ;.end ; ;; ;ldx OutTail\1 ; anything to transmit? ;cpx OutHead\1 ; ;.if ne ; yes: ;lda OutDisable\1 ; allowed to transmit? ;.if eq ; yes: ;lda CIA+C_PB ; check CTS signal ;and #[1<<\1] ; (for this port only) ;bne =DONE ; not allowed to send -> done ;lda obuf\1,x ; get a char from buffer ;sta ACIA\1+A_DATA ; send it away ;inc OutTail\1 ; update read index ;.end ; ;.end ; ;.end ; ;=DONE .end localendmPORTVAR macro * port numberVARDEF InHead\1 1VARDEF InTail\1 1VARDEF OutDisable\1 1VARDEF OutHead\1 1VARDEF OutTail\1 1VARDEF OutCtrl\1 1VARDEF OutFlush\1 1VARDEF SetUp\1 1VARDEF Param\1 1VARDEF Command\1 1VARDEF SoftFlow\1 1; private:VARDEF XonOff\1 1endmVARBASE 0 ; start variables at address $0000PORTVAR 0 ; define variables for port 0PORTVAR 1 ; define variables for port 1PORTVAR 2 ; define variables for port 2PORTVAR 3 ; define variables for port 3PORTVAR 4 ; define variables for port 4PORTVAR 5 ; define variables for port 5PORTVAR 6 ; define variables for port 6VARDEF Crystal 1 ; 0 = unknown, 1 = normal, 2 = turboVARDEF Pad_a 1VARDEF TimerH 1VARDEF TimerL 1VARDEF CDHead 1VARDEF CDTail 1VARDEF CDStatus 1VARDEF Pad_b 1VARDEF CommonCDo 1 ; for carrier detect optimizationVARDEF CommonCDc 1 ; for carrier detect debouncingVARDEF CommonCDb 1 ; for carrier detect debouncingVARBASE $0200VARDEF obuf0 256 ; output data (characters only)VARDEF obuf1 256VARDEF obuf2 256VARDEF obuf3 256VARDEF obuf4 256VARDEF obuf5 256VARDEF obuf6 256VARDEF ibuf0 256 ; input data (characters, events etc - see ictl)VARDEF ibuf1 256VARDEF ibuf2 256VARDEF ibuf3 256VARDEF ibuf4 256VARDEF ibuf5 256VARDEF ibuf6 256VARDEF ictl0 256 ; input control information (type of data in ibuf)VARDEF ictl1 256VARDEF ictl2 256VARDEF ictl3 256VARDEF ictl4 256VARDEF ictl5 256VARDEF ictl6 256VARDEF cdbuf 256 ; CD event queueACIA0 equ $4400ACIA1 equ $4c00ACIA2 equ $5400ACIA3 equ $5c00ACIA4 equ $6400ACIA5 equ $6c00ACIA6 equ $7400A_DATA equ $00A_SR equ $02A_CMD equ $04A_CTRL equ $06; 00 write transmit data read received data; 02 reset ACIA read status register; 04 write command register read command register; 06 write control register read control registerCIA equ $7c00 ; 8520 CIAC_PA equ $00 ; port A data registerC_PB equ $02 ; port B data registerC_DDRA equ $04 ; data direction register for port AC_DDRB equ $06 ; data direction register for port BC_TAL equ $08 ; timer AC_TAH equ $0aC_TBL equ $0c ; timer BC_TBH equ $0eC_TODL equ $10 ; TOD LSBC_TODM equ $12 ; TOD middle byteC_TODH equ $14 ; TOD MSBC_DATA equ $18 ; serial data registerC_INTCTRL equ $1a ; interrupt control registerC_CTRLA equ $1c ; control register AC_CTRLB equ $1e ; control register Bsection main,code,CODE-2db >CODE,<CODE;-----------------------------------------------------------------------;; here's the initialization code: ;; ;R_RESET ldx #$ff ;txs ; initialize stack pointer ;cld ; in case a 6502 is used... ;ldx #0 ; ;lda #0 ; ;ldy #Crystal ; this many bytes to clear ;clr_loop sta 0,x ; clear zero page variables ;inx ; ;dey ; ;bne clr_loop ; ;; ;stz CommonCDo ; force CD test at boot ;stz CommonCDb ; ;stz CDHead ; clear queue ;stz CDTail ; ;; ;lda #0 ; ;sta Pad_a ; ;lda #170 ; test cmp ;cmp #100 ; ;.if cs ; ;inc Pad_a ; C was set ;.end ; ;;;-----------------------------------------------------------------------;; Speed check ;;-----------------------------------------------------------------------;;lda Crystal ; speed already set? ;beq DoSpeedy ; ;jmp LOOP ; yes, skip speed test ;; ;DoSpeedy lda #%10011000 ; 8N1, 1200/2400 bps ;sta ACIA0+A_CTRL ; ;lda #%00001011 ; enable DTR ;sta ACIA0+A_CMD ; ;lda ACIA0+A_SR ; read status register ;; ;lda #%10000000 ; disable all ints (unnecessary);sta CIA+C_INTCTRL ; ;lda #255 ; program the timer ;sta CIA+C_TAL ; ;sta CIA+C_TAH ; ;; ;ldx #0 ; ;stx ACIA0+A_DATA ; transmit a zero ;nop ; ;nop ; ;lda ACIA0+A_SR ; read status ;nop ; ;nop ; ;stx ACIA0+A_DATA ; transmit a zero ;Speedy1 lda ACIA0+A_SR ; read status ;and #[1<<4] ; transmit data reg empty? ;beq Speedy1 ; not yet, wait more ;; ;lda #%00010001 ; load & start the timer ;stx ACIA0+A_DATA ; transmit one more zero ;sta CIA+C_CTRLA ; ;Speedy2 lda ACIA0+A_SR ; read status ;and #[1<<4] ; transmit data reg empty? ;beq Speedy2 ; not yet, wait more ;stx CIA+C_CTRLA ; stop the timer ;; ;lda CIA+C_TAL ; copy timer value for 68k ;sta TimerL ; ;lda CIA+C_TAH ; ;sta TimerH ; ;cmp #$d0 ; turbo or normal? ;.if cs ; ;lda #2 ; turbo! :-) ;.else ; ;lda #1 ; normal :-( ;.end ; ;sta Crystal ; ;lda #0 ; ;sta ACIA0+A_SR ; ;sta ACIA0+A_CTRL ; reset UART ;sta ACIA0+A_CMD ; ;;jmp LOOP ;;; ;;-----------------------------------------------------------------------;; ;; The Real Thing: ;; ;LOOP DO_SLOW ; do non-critical things ;jsr do_input ; check for received dataDO_PORT 0jsr do_inputDO_PORT 1jsr do_inputDO_PORT 2jsr do_inputDO_PORT 3jsr do_inputDO_PORT 4jsr do_inputDO_PORT 5jsr do_inputDO_PORT 6jsr do_inputjmp LOOPdo_input DO_DATA 0DO_DATA 1DO_DATA 2DO_DATA 3DO_DATA 4DO_DATA 5DO_DATA 6rts;-----------------------------------------------------------------------;section vectors,data,$3ffadw $d0d0dw R_RESETdw $c0ce;-----------------------------------------------------------------------;end
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