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https://github.com/bobbimanners/emailler.git
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e06c02e4a3
* CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
392 lines
7.8 KiB
ArmAsm
392 lines
7.8 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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.macpack module
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module_header _cs8900a
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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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jmp init
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jmp poll
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jmp send
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jmp exit
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;---------------------------------------------------------------------
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.if DYN_DRV
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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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.else
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.include "zeropage.inc"
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reg := ptr1 ; Address of rxtxreg
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ptr := ptr2 ; Indirect addressing pointer
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len := ptr3 ; Frame length
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cnt := ptr4 ; Frame length counter
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.endif
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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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.byte fixup23-fixup22, fixup24-fixup23, fixup25-fixup24
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.byte fixup26-fixup25
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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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; Check EISA registration number of Crystal Semiconductor
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; PACKETPP = $0000, PPDATA == $630E ?
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lda #$00
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tax
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jsr packetpp_ax
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lda #$63^$0E
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fixup03:eor ppdata
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fixup04:eor ppdata+1
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beq :+
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sec
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rts
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; Initiate a chip-wide reset
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; PACKETPP = $0114, PPDATA = $0040
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: lda #$14
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jsr packetpp_a1
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ldy #$40
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fixup05:sty ppdata
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: jsr packetpp_a1
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fixup06:ldy ppdata
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and #$40
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bne :-
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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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txa
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clc
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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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fixup07:lda ppdata+1
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and #$0D
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beq :+
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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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fixup08:ldx rxtxreg+1
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fixup09:lda rxtxreg
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; Read frame length
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; cnt = len = RXTXREG
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fixup10:ldx rxtxreg+1
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fixup11: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 #$00
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: tax
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sec
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rts
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; Read bytes into buffer
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: jsr adjustptr
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:
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fixup12:lda rxtxreg
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sta (ptr),y
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iny
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fixup13:lda rxtxreg+1
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sta (ptr),y
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iny
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bne :-
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inc ptr+1
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dex
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bpl :-
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; Return frame length
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lda len
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ldx len+1
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clc
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rts
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;---------------------------------------------------------------------
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send:
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; Save frame length
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sta cnt
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stx cnt+1
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; Transmit command
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lda #$C9
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ldx #$00
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fixup14:sta txcmd
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fixup15:stx txcmd+1
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lda cnt
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ldx cnt+1
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fixup16:sta txlen
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fixup17: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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fixup18: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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sec
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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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fixup19:sta rxtxreg
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iny
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lda (ptr),y
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fixup20: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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clc
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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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packetpp_ax:
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fixup21:sta packetpp
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fixup22:stx packetpp+1
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rts
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;---------------------------------------------------------------------
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ppdata_ax:
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fixup23:sta ppdata
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fixup24: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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fixup25:lda ppdata
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ora #$40
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fixup26:sta ppdata
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rts
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;---------------------------------------------------------------------
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adjustcnt:
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lsr
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bcc :+
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inc cnt
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bne :+
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inc cnt+1
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: rts
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;---------------------------------------------------------------------
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adjustptr:
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lda cnt
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ldx cnt+1
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eor #$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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