352 lines
7.2 KiB
ArmAsm
352 lines
7.2 KiB
ArmAsm
;
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; Copyright (c) 2007, Adam Dunkels and Oliver Schmidt
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions
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; are met:
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; 1. Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; 2. Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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; 3. Neither the name of the Institute nor the names of its contributors
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; may be used to endorse or promote products derived from this software
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; without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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; ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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; SUCH DAMAGE.
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;
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; This file is part of the Contiki operating system.
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;
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; Author: Adam Dunkels <adam@sics.se>, Oliver Schmidt <ol.sc@web.de>
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;
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;---------------------------------------------------------------------
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.segment "HEADER"
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; Driver signature
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.byte $65, $74, $68 ; "eth"
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.byte $01 ; Ethernet driver API version number
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; Ethernet address
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mac: .byte $00, $0E, $3A ; OUI of Cirrus Logic
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.byte $11, $11, $11
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; Buffer attributes
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bufaddr:.res 2 ; Address
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bufsize:.res 2 ; Size
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; Jump table.
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.addr init
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.addr poll
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.addr send
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.addr exit
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;---------------------------------------------------------------------
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.zeropage
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sp: .res 2 ; Stack pointer (Do not trash !)
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reg: .res 2 ; Address of rxtxreg
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ptr: .res 2 ; Indirect addressing pointer
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len: .res 2 ; Frame length
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cnt: .res 2 ; Frame length counter
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;---------------------------------------------------------------------
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.rodata
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fixup: .byte fixup02-fixup01, fixup03-fixup02, fixup04-fixup03
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.byte fixup05-fixup04, fixup06-fixup05, fixup07-fixup06
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.byte fixup08-fixup07, fixup09-fixup08, fixup10-fixup09
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.byte fixup11-fixup10, fixup12-fixup11, fixup13-fixup12
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.byte fixup14-fixup13, fixup15-fixup14, fixup16-fixup15
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.byte fixup17-fixup16, fixup18-fixup17, fixup19-fixup18
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.byte fixup20-fixup19, fixup21-fixup20, fixup22-fixup21
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fixups = * - fixup
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;---------------------------------------------------------------------
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rxtxreg := $FF00 ; High byte patched at runtime
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txcmd := $FF04 ; High byte patched at runtime
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txlen := $FF06 ; High byte patched at runtime
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isq := $FF08 ; High byte patched at runtime
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packetpp := $FF0A ; High byte patched at runtime
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ppdata := $FF0C ; High byte patched at runtime
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.data
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;---------------------------------------------------------------------
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init:
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; Save address of rxtxreg
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sta reg
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stx reg+1
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; Start with first fixup location
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lda #<(fixup01+1)
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ldx #>(fixup01+1)
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sta ptr
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stx ptr+1
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ldx #$FF
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ldy #$00
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; Fixup address at location
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: lda reg
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eor (ptr),y ; Use XOR to support C64 RR-Net
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sta (ptr),y
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iny
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lda reg+1
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sta (ptr),y
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dey
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; Advance to next fixup location
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inx
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cpx #fixups
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bcs :+
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lda ptr
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clc
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adc fixup,x
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sta ptr
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bcc :-
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inc ptr+1
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bcs :- ; Always
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; Activate C64 RR clockport in order to operate RR-Net
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; - RR config register overlays CS8900A ISQ register
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; - No need to distinguish as ISQ access doesn't hurt
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:
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fixup01:lda isq+1
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ora #$01 ; Set clockport bit
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fixup02:sta isq+1
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; Accept valid unicast + broadcast frames
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; PACKETPP = $0104, PPDATA = $0D05
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lda #$04
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jsr packetpp_a1
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lda #$05
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ldx #$0D
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jsr ppdata_ax
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; Set MAC address
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; PACKETPP = $0158, PPDATA = MAC[0], MAC[1]
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; PACKETPP = $015A, PPDATA = MAC[2], MAC[3]
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; PACKETPP = $015C, PPDATA = MAC[4], MAC[5]
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ldy #$58
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: tya
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jsr packetpp_a1
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lda mac-$58,y
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ldx mac-$58+1,y
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jsr ppdata_ax
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iny
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iny
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cpy #$58+6
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bcc :-
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; Turn on transmission and reception of frames
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; PACKETPP = $0112, PPDATA = $00D3
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lda #$12
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jsr packetpp_a1
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lda #$D3
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ldx #$00
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jsr ppdata_ax
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rts
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;---------------------------------------------------------------------
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poll:
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; Check receiver event register to see if there
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; are any valid unicast frames avaliable
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; PACKETPP = $0124, PPDATA & $0D00 ?
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lda #$24
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jsr packetpp_a1
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fixup03:lda ppdata+1
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and #$0D
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bne :+
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; No frame ready
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tax
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rts
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; Process the incoming frame
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; --------------------------
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; Read receiver event and discard it
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; RXTXREG
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:
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fixup04:ldx rxtxreg+1
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fixup05:lda rxtxreg
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; Read frame length
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; cnt = len = RXTXREG
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fixup06:ldx rxtxreg+1
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fixup07:lda rxtxreg
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sta len
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stx len+1
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sta cnt
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stx cnt+1
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; Adjust odd frame length
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jsr adjustcnt
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; Is bufsize < cnt ?
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lda bufsize
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cmp cnt
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lda bufsize+1
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sbc cnt+1
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bcs :+
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; Yes, skip frame
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jsr skipframe
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; No frame ready
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lda #$00
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tax
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rts
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; Read bytes into buffer
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: jsr adjustptr
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:
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fixup08:lda rxtxreg
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sta (ptr),y
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iny
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fixup09:lda rxtxreg+1
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sta (ptr),y
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iny
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bne :-
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inc ptr+1
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dex
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bpl :-
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; Return frame length
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lda len
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ldx len+1
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rts
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;---------------------------------------------------------------------
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send:
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; Save frame length
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sta cnt
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stx cnt+1
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; Transmit command
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lda #$C9
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ldx #$00
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fixup10:sta txcmd
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fixup11:stx txcmd+1
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lda cnt
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ldx cnt+1
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fixup12:sta txlen
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fixup13:stx txlen+1
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; Adjust odd frame length
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jsr adjustcnt
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; 8 retries
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ldy #$08
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; Check for avaliable buffer space
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; PACKETPP = $0138, PPDATA & $0100 ?
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: lda #$38
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jsr packetpp_a1
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fixup14:lda ppdata+1
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and #$01
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bne :+
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; No space avaliable, skip a received frame
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jsr skipframe
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; And try again
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dey
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bne :-
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rts
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; Send the frame
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; --------------
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; Write bytes from buffer
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: jsr adjustptr
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: lda (ptr),y
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fixup15:sta rxtxreg
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iny
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lda (ptr),y
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fixup16:sta rxtxreg+1
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iny
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bne :-
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inc ptr+1
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dex
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bpl :-
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rts
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;---------------------------------------------------------------------
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exit:
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rts
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;---------------------------------------------------------------------
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packetpp_a1:
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ldx #$01
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fixup17:sta packetpp
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fixup18:stx packetpp+1
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rts
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;---------------------------------------------------------------------
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ppdata_ax:
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fixup19:sta ppdata
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fixup20:stx ppdata+1
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rts
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;---------------------------------------------------------------------
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skipframe:
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; PACKETPP = $0102, PPDATA = PPDATA | $0040
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lda #$02
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jsr packetpp_a1
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fixup21:lda ppdata
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ora #$40
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fixup22:sta ppdata
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rts
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;---------------------------------------------------------------------
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adjustcnt:
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lsr
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bcc :+
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inc cnt
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bne :+
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inc cnt+1
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: rts
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;---------------------------------------------------------------------
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adjustptr:
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lda cnt
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ldx cnt+1
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eor #$FF ; Two's complement part 1
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tay
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iny ; Two's complement part 2
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sty reg
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sec
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lda bufaddr
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sbc reg
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sta ptr
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lda bufaddr+1
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sbc #$00
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sta ptr+1
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rts
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;---------------------------------------------------------------------
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