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List:       freebsd-hackers
Subject:    Fwd: puc(4) and single I/O port cards.
From:       Jonathan Chen <jonc () chen ! org ! nz>
Date:       2010-11-28 22:20:06
Message-ID: AANLkTinrMaqB9Bev41NwgQSSvcF19TyOQ4T4PW-S_2vd () mail ! gmail ! com
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Hi,

I've recently added a PCI 1 Parallel Port card, and I'm trying to get
it recognised by my 8-STABLE/amd64 system.

The relevant entry from "pciconv -lcv" is:
   none2@pci0:4:6:0:   class=0x070103 card=0x2000a000 chip=0x98659710
rev=0x00 hdr=0x00
       vendor     = 'MosChip Semiconductors (Was: Netmos Technology)'
       class      = simple comms
       subclass   = parallel port
       cap 01[48] = powerspec 2  supports D0 D3  current D0

This is matched by info from "devinfo -rv":
   unknown pnpinfo vendor=0x9710 device=0x9865 subvendor=0xa000
subdevice=0x2000 class=0x070103 at slot=6 function=0

Using this info, I've patched sys/dev/puc/pucdata.c:

*** pucdata.c.orig      Fri Nov 26 20:31:08 2010
--- pucdata.c   Fri Nov 26 20:32:10 2010
***************
*** 820,825 ****
--- 820,831 ----
           PUC_PORT_4S1P, 0x10, 4, 0,
       },

+       {   0x9710, 0x9865, 0xa000, 0x2000,
+           "NetMos NM9865 Single 1284 Printer port",
+           DEFAULT_RCLK,
+           PUC_PORT_1P, 0x10, 4, 0,
+       },
+
       {   0x9710, 0x9865, 0xa000, 0x3002,
           "NetMos NM9865 Dual UART",
           DEFAULT_RCLK,

And I've added the following line to /boot/loader.conf:
   puc_load="YES"

However, all of this doesn't work. dmesg reveals:
   pci4: <ACPI PCI bus> on pcib4
   pci4: <simple comms, parallel port> at device 6.0 (no driver attached)

I've taken a look at the puc(4) code, and from my limited
understanding, it appears that the section that's preventing it from
being recognised is in puc.c:puc_bfe_probe(). In particular:

   /* We don't attach to single-port serial cards. */
   if (cfg->ports == PUC_PORT_1S || cfg->ports == PUC_PORT_1P)
       return (EDOOFUS);

Why is the check there? Is there something about single I/O port cards
that interacts badly with the rest of the system?

Cheers.
--
Jonathan Chen <jonc@chen.org.nz>
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