Based on kernel version 4.1. Page generated on 2015-06-28 12:13 EST.
1 Originally, this driver was written for the Digital Equipment 2 Corporation series of EtherWORKS Ethernet cards: 3 4 DE425 TP/COAX EISA 5 DE434 TP PCI 6 DE435 TP/COAX/AUI PCI 7 DE450 TP/COAX/AUI PCI 8 DE500 10/100 PCI Fasternet 9 10 but it will now attempt to support all cards which conform to the 11 Digital Semiconductor SROM Specification. The driver currently 12 recognises the following chips: 13 14 DC21040 (no SROM) 15 DC21041[A] 16 DC21140[A] 17 DC21142 18 DC21143 19 20 So far the driver is known to work with the following cards: 21 22 KINGSTON 23 Linksys 24 ZNYX342 25 SMC8432 26 SMC9332 (w/new SROM) 27 ZNYX31 28 ZNYX346 10/100 4 port (can act as a 10/100 bridge!) 29 30 The driver has been tested on a relatively busy network using the DE425, 31 DE434, DE435 and DE500 cards and benchmarked with 'ttcp': it transferred 32 16M of data to a DECstation 5000/200 as follows: 33 34 TCP UDP 35 TX RX TX RX 36 DE425 1030k 997k 1170k 1128k 37 DE434 1063k 995k 1170k 1125k 38 DE435 1063k 995k 1170k 1125k 39 DE500 1063k 998k 1170k 1125k in 10Mb/s mode 40 41 All values are typical (in kBytes/sec) from a sample of 4 for each 42 measurement. Their error is +/-20k on a quiet (private) network and also 43 depend on what load the CPU has. 44 45 ========================================================================= 46 47 The ability to load this driver as a loadable module has been included 48 and used extensively during the driver development (to save those long 49 reboot sequences). Loadable module support under PCI and EISA has been 50 achieved by letting the driver autoprobe as if it were compiled into the 51 kernel. Do make sure you're not sharing interrupts with anything that 52 cannot accommodate interrupt sharing! 53 54 To utilise this ability, you have to do 8 things: 55 56 0) have a copy of the loadable modules code installed on your system. 57 1) copy de4x5.c from the /linux/drivers/net directory to your favourite 58 temporary directory. 59 2) for fixed autoprobes (not recommended), edit the source code near 60 line 5594 to reflect the I/O address you're using, or assign these when 61 loading by: 62 63 insmod de4x5 io=0xghh where g = bus number 64 hh = device number 65 66 NB: autoprobing for modules is now supported by default. You may just 67 use: 68 69 insmod de4x5 70 71 to load all available boards. For a specific board, still use 72 the 'io=?' above. 73 3) compile de4x5.c, but include -DMODULE in the command line to ensure 74 that the correct bits are compiled (see end of source code). 75 4) if you are wanting to add a new card, goto 5. Otherwise, recompile a 76 kernel with the de4x5 configuration turned off and reboot. 77 5) insmod de4x5 [io=0xghh] 78 6) run the net startup bits for your new eth?? interface(s) manually 79 (usually /etc/rc.inet at boot time). 80 7) enjoy! 81 82 To unload a module, turn off the associated interface(s) 83 'ifconfig eth?? down' then 'rmmod de4x5'. 84 85 Automedia detection is included so that in principle you can disconnect 86 from, e.g. TP, reconnect to BNC and things will still work (after a 87 pause whilst the driver figures out where its media went). My tests 88 using ping showed that it appears to work.... 89 90 By default, the driver will now autodetect any DECchip based card. 91 Should you have a need to restrict the driver to DIGITAL only cards, you 92 can compile with a DEC_ONLY define, or if loading as a module, use the 93 'dec_only=1' parameter. 94 95 I've changed the timing routines to use the kernel timer and scheduling 96 functions so that the hangs and other assorted problems that occurred 97 while autosensing the media should be gone. A bonus for the DC21040 98 auto media sense algorithm is that it can now use one that is more in 99 line with the rest (the DC21040 chip doesn't have a hardware timer). 100 The downside is the 1 'jiffies' (10ms) resolution. 101 102 IEEE 802.3u MII interface code has been added in anticipation that some 103 products may use it in the future. 104 105 The SMC9332 card has a non-compliant SROM which needs fixing - I have 106 patched this driver to detect it because the SROM format used complies 107 to a previous DEC-STD format. 108 109 I have removed the buffer copies needed for receive on Intels. I cannot 110 remove them for Alphas since the Tulip hardware only does longword 111 aligned DMA transfers and the Alphas get alignment traps with non 112 longword aligned data copies (which makes them really slow). No comment. 113 114 I have added SROM decoding routines to make this driver work with any 115 card that supports the Digital Semiconductor SROM spec. This will help 116 all cards running the dc2114x series chips in particular. Cards using 117 the dc2104x chips should run correctly with the basic driver. I'm in 118 debt to <firstname.lastname@example.org> for the testing and feedback that helped get 119 this feature working. So far we have tested KINGSTON, SMC8432, SMC9332 120 (with the latest SROM complying with the SROM spec V3: their first was 121 broken), ZNYX342 and LinkSys. ZNYX314 (dual 21041 MAC) and ZNYX 315 122 (quad 21041 MAC) cards also appear to work despite their incorrectly 123 wired IRQs. 124 125 I have added a temporary fix for interrupt problems when some SCSI cards 126 share the same interrupt as the DECchip based cards. The problem occurs 127 because the SCSI card wants to grab the interrupt as a fast interrupt 128 (runs the service routine with interrupts turned off) vs. this card 129 which really needs to run the service routine with interrupts turned on. 130 This driver will now add the interrupt service routine as a fast 131 interrupt if it is bounced from the slow interrupt. THIS IS NOT A 132 RECOMMENDED WAY TO RUN THE DRIVER and has been done for a limited time 133 until people sort out their compatibility issues and the kernel 134 interrupt service code is fixed. YOU SHOULD SEPARATE OUT THE FAST 135 INTERRUPT CARDS FROM THE SLOW INTERRUPT CARDS to ensure that they do not 136 run on the same interrupt. PCMCIA/CardBus is another can of worms... 137 138 Finally, I think I have really fixed the module loading problem with 139 more than one DECchip based card. As a side effect, I don't mess with 140 the device structure any more which means that if more than 1 card in 141 2.0.x is installed (4 in 2.1.x), the user will have to edit 142 linux/drivers/net/Space.c to make room for them. Hence, module loading 143 is the preferred way to use this driver, since it doesn't have this 144 limitation. 145 146 Where SROM media detection is used and full duplex is specified in the 147 SROM, the feature is ignored unless lp->params.fdx is set at compile 148 time OR during a module load (insmod de4x5 args='eth??:fdx' [see 149 below]). This is because there is no way to automatically detect full 150 duplex links except through autonegotiation. When I include the 151 autonegotiation feature in the SROM autoconf code, this detection will 152 occur automatically for that case. 153 154 Command line arguments are now allowed, similar to passing arguments 155 through LILO. This will allow a per adapter board set up of full duplex 156 and media. The only lexical constraints are: the board name (dev->name) 157 appears in the list before its parameters. The list of parameters ends 158 either at the end of the parameter list or with another board name. The 159 following parameters are allowed: 160 161 fdx for full duplex 162 autosense to set the media/speed; with the following 163 sub-parameters: 164 TP, TP_NW, BNC, AUI, BNC_AUI, 100Mb, 10Mb, AUTO 165 166 Case sensitivity is important for the sub-parameters. They *must* be 167 upper case. Examples: 168 169 insmod de4x5 args='eth1:fdx autosense=BNC eth0:autosense=100Mb'. 170 171 For a compiled in driver, in linux/drivers/net/CONFIG, place e.g. 172 DE4X5_OPTS = -DDE4X5_PARM='"eth0:fdx autosense=AUI eth2:autosense=TP"' 173 174 Yes, I know full duplex isn't permissible on BNC or AUI; they're just 175 examples. By default, full duplex is turned off and AUTO is the default 176 autosense setting. In reality, I expect only the full duplex option to 177 be used. Note the use of single quotes in the two examples above and the 178 lack of commas to separate items.