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From: Kars de Jong <jongk@linux-m68k.org>
To: "Andreas 'count' Kotes"  <count-vger.kernel.org+linux-m68k@flatline.de>
Cc: linux-m68k <linux-m68k@vger.kernel.org>
Subject: Re: Amiga PCMCIA network card support
Date: Fri, 25 Oct 2019 09:25:19 +0200
Message-ID: <CACz-3rgbLHbQf7kSbyH7NP5SUcMt1hJ=FiU+SGpTT8ZecuLYVQ@mail.gmail.com> (raw)
In-Reply-To: <7d87adfd-4373-950d-fc94-3bbdcce9e798@flatline.de>

Op do 24 okt. 2019 om 22:56 schreef Andreas 'count' Kotes
<count-vger.kernel.org+linux-
> What needs to happen for stable, reliable support for existing PCMCIA
> network cards people already have? How can we unblock those possible
> Linux users?

That would involve quite a few things. I did most of this back in 2.6
times, and had the standard pcnet_cs, 3c589_cs and serial_cs drivers
working on my Amiga 1200. Some of it was a bit hackish though, changes
to <asm/io.h> were discussed but never implemented. The need to be
able to build a multi-machine kernel (with Atari, Q40 and Amiga
support in a single kernel) was one of the things that interfered (it
could probably be solved by adding an extra level of indirection ;-)).
Then Real Life happened and I didn't touch my Amiga for 10+ years...

1) A proper driver for the PCMCIA slot, including hot plugging and
proper controller reset. This involves rewriting part of the IRQ
handling to make Gayle a separate IRQ controller instead of the hard
coded hack that is used now. That shouldn't be too hard. Support for
setting up different data path widths (IO_DATA_PATH_WIDTH_16 etc.)
will require changes to <asm/io.h>, see point 2.
2) Rework <asm/io.h> so inb()/inw()/inl(), outb()/outw()/outl(),
insb()/insw()/insl() and outsb()/outsw()/outsl() "just work" for
PCMCIA address space without having to create ugly hacks in the
generic drivers. This is not trivial because of the strange memory
mapping of the Amiga PCMCIA slot.
3) ...
4) Profit!

Oh, the 3c589_cs driver needed an ugly hack because some of the
registers just didn't read out properly on the Amiga with 16-bit
access. That issue is also described in the source code for the
AmigaOS driver.

Kind regards,

Kars.

  reply index

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24 20:56 Andreas 'count' Kotes
2019-10-25  7:25 ` Kars de Jong [this message]
2019-10-25 11:49   ` Andreas 'count' Kotes
2019-10-28  9:19     ` Kars de Jong
2019-10-28 11:08       ` John Paul Adrian Glaubitz
2019-10-28 13:00         ` Kars de Jong
2019-10-28 13:20           ` John Paul Adrian Glaubitz
2019-10-28 15:39             ` ESP SCSI driver (was: Amiga PCMCIA network card support) Kars de Jong
2019-10-28 18:32               ` Michael Schmitz
2019-10-29  9:37                 ` Kars de Jong
2019-10-29 20:20                   ` ESP SCSI driver Michael Schmitz
2019-10-29 22:05                   ` [PATCH] esp_scsi: Add support for FSC chip Kars de Jong
2019-10-30  0:23                     ` Michael Schmitz
2019-10-30  7:11                       ` Kars de Jong
2019-10-30 18:42                         ` Michael Schmitz
2019-10-30  0:31                     ` Finn Thain
2019-10-30  1:06                       ` Michael Schmitz
2019-10-30  7:25                         ` Kars de Jong
2019-10-30  8:45                           ` Geert Uytterhoeven
2019-10-30  9:08                             ` Kars de Jong
2019-10-30 18:34                               ` Michael Schmitz
2019-10-30 18:52                             ` Brad Boyer
2019-10-30  7:22                       ` Kars de Jong
2019-10-30 23:15                         ` Finn Thain
2019-11-12 18:57                     ` [PATCH 0/2] Some esp_scsi updates Kars de Jong
2019-11-12 18:57                       ` [PATCH 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-12 23:07                         ` Finn Thain
2019-11-13  8:00                           ` Kars de Jong
2019-11-13 22:25                             ` Finn Thain
2019-11-13 14:22                         ` Christoph Hellwig
2019-11-13 15:03                           ` Kars de Jong
2019-11-12 18:57                       ` [PATCH 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-12 23:18                         ` Finn Thain
2019-11-12 23:57                           ` Finn Thain
2019-11-13  9:30                           ` Kars de Jong
2019-11-13 22:24                             ` Finn Thain
2019-11-14 21:59                       ` [PATCH v2 0/2] Some esp_scsi updates Kars de Jong
2019-11-14 21:59                         ` [PATCH 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-14 22:06                           ` Kars de Jong
2019-11-14 21:59                         ` [PATCH 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-14 22:07                           ` Kars de Jong
2019-11-14 22:25                         ` [PATCH v3 0/2] Some esp_scsi updates Kars de Jong
2019-11-14 22:25                           ` [PATCH v2 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-15  2:13                             ` Finn Thain
2019-11-15  7:04                               ` Kars de Jong
2019-11-14 22:25                           ` [PATCH v3 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-15  2:09                             ` Finn Thain
2019-11-18 13:27                               ` Kars de Jong
2019-11-09 19:14                   ` [PATCH] zorro_esp: increase maximum dma length to 65536 bytes Kars de Jong
2019-11-09 20:12                     ` James Bottomley
2019-11-10  2:36                       ` Michael Schmitz
2019-11-10  9:01                         ` Kars de Jong
2019-11-10 19:26                           ` Michael Schmitz
2019-11-11  8:47                             ` Kars de Jong
2019-11-10 19:35                         ` James Bottomley
2019-11-12 17:55                           ` [PATCH v2] zorro_esp: Limit DMA transfers to 65536 bytes (except on Fastlane) Kars de Jong
2019-11-12 22:46                             ` Finn Thain
2019-11-13  2:27                             ` Martin K. Petersen
2019-11-12  9:34                         ` [PATCH] zorro_esp: increase maximum dma length to 65536 bytes Kars de Jong
2019-11-09 22:53                     ` Finn Thain
2019-11-10  9:06                       ` Kars de Jong
2019-10-28 23:38               ` ESP SCSI driver (was: Amiga PCMCIA network card support) Finn Thain
2019-10-29 11:52                 ` Kars de Jong
2019-10-29 20:16                   ` ESP SCSI driver Michael Schmitz
2019-10-28 22:31           ` Amiga PCMCIA network card support Finn Thain
2019-10-29  8:56           ` FOSDEM (was: Re: Amiga PCMCIA network card support) Geert Uytterhoeven
2019-10-29  9:13             ` John Paul Adrian Glaubitz
2019-10-28 22:08       ` Amiga PCMCIA network card support Finn Thain
2019-10-29  9:00       ` Geert Uytterhoeven
2019-10-29  9:12         ` John Paul Adrian Glaubitz
2019-10-29  9:14           ` Geert Uytterhoeven
2019-10-29  9:20             ` John Paul Adrian Glaubitz
2019-10-29  9:40         ` Kars de Jong
2019-10-28  6:57   ` Michael Schmitz

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