Port-amiga archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

3c589 PCMCIA on A1200 - possible resolution to PR port-amiga/31134


I have made an effort to get the 3Com 3C589 EtherLink III PCMCIA Ethernet card going in NetBSD 9.0 on Amiga A1200.

The results look promising. However, since I don't have access to other PCMCIA cards, one concern is that the patch could break support for other PCMCIA cards with 8-bit and 16-bit I/O.

Below is some background, an example and the patch.

The NetBSD Amiga PCMCIA bus driver, gayle_pcmcia.c, appears to be
working well with 8-bit PCMCIA I/O accesses but not 16-bit I/O accesses. This patch enables support for 16-bit I/O accesses which allows for use of the 3Com
3C589 EtherLink III Ethernet controller.

Mapping of motherboard (CPU) bus accesses to the PCMCIA bus is handled by the Gayle chip. The chip and how it interfaces with the Amiga computer is not very
well docuemented.

For 8-bit PCMCIA I/O accesses, PCMCIA address line A0 is controlled by CPU A16
and is handled correctly by the current gayle_pcmcia.c.

For 16-bit PCMCIA I/O accesses, no address translation is needed on the CPU
side. However, the word data (16-bit) bus between the CPU bus and the PCMCIA
bus is byte swapped. This patch accounts for the byte-swapping in software.

How it was tested:
The patch has been tested with NetBSD 9.0 on an Amiga A1200 and the 3Com 3C689
PCMCIA card. Two different processor boards were been used: Blizzard 1230 IV
and Blizzard 1260.

NetBSD 9.0 kernel boot message without this patch (same as reported in the 2005
problem report):
  [   1.0000050] pccard0 at mainbus0
  [   1.0000050] pcmcia0 at pccard0
[ 1.0000050] ep0 at pcmcia0 function 0: <3Com Corporation, 3C589D, TP/BNC LAN Card Ver. 2a, 000002> [ 1.0000050] ep0: wrote 0x7ff to TX_AVAIL_THRESH, read back 0x0. Interface disabled
  [   1.0000050] ep0: couldn't configure controller

NetBSD 9.0 kernel boot message with this patch:
  [   1.0000050] pccard0 at mainbus0
  [   1.0000050] pcmcia0 at pccard0
[ 1.0000050] ep0 at pcmcia0 function 0: <3Com Corporation, 3C589D, TP/BNC LAN Card Ver. 2a, 000002> [ 1.0000050] ep0: address 00:60:08:22:32:e4, 8KB byte-wide FIFO, 5:3 Rx:Tx split
  [   1.0000050] ep0: 10baseT, 10base5, 10base2 (default 10baseT)

Example use:
  # ifconfig ep0
  ep0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
          address: 00:60:08:22:32:e4
          media: Ethernet 10baseT
          inet broadcast flags 0x0
          inet6 fe80::260:8ff:fe22:32e4%ep0/64 flags 0x0 scopeid 0x1
  # ping
  PING cl ( 56 data bytes
  64 bytes from icmp_seq=0 ttl=64 time=5.315917 ms
  64 bytes from icmp_seq=1 ttl=64 time=7.304981 ms
  64 bytes from icmp_seq=2 ttl=64 time=7.319078 ms
  64 bytes from icmp_seq=3 ttl=64 time=7.288065 ms

  ----cl PING Statistics----
  4 packets transmitted, 4 packets received, 0.0% packet loss
  round-trip min/avg/max/stddev = 5.315917/6.807010/7.319078/0.994143 ms

- Unplugging the card and inserting it again works.
- Not tested with other PCMCIA cards.
- Closes PR port-amiga/31134

(Yes, it changes only a single source code line.)

$ git diff origin/netbsd-9
diff --git a/sys/arch/amiga/dev/gayle_pcmcia.c b/sys/arch/amiga/dev/gayle_pcmcia.c
index ea3a131b98ff..8bc49f61fd55 100644
--- a/sys/arch/amiga/dev/gayle_pcmcia.c
+++ b/sys/arch/amiga/dev/gayle_pcmcia.c
@@ -131,7 +131,7 @@ pccard_attach(device_t parent, device_t self, void *aux)

        /* override the one-byte access methods for I/O space */
-       pcmio_bs_methods = amiga_bus_stride_1;
+       pcmio_bs_methods = amiga_bus_stride_1swap;
        pcmio_bs_methods.bsr1 = pcmio_bsr1;
        pcmio_bs_methods.bsw1 = pcmio_bsw1;
        pcmio_bs_methods.bsrm1 = pcmio_bsrm1;



Home | Main Index | Thread Index | Old Index