On Fri, Apr 5, 2024, at 12:16, Geert Uytterhoeven wrote:
On Wed, Apr 3, 2024 at 8:35 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
On Wed, Apr 3, 2024, at 20:11, Michael Schmitz wrote:
For the Q40, it may be better in the long run to change the
drivers to just use MMIO directly though.
Q40 uses ISA.
Ah, indeed. I got confused by the NE2000 example as that
contains "depends on (ISA || (Q40 && m)", which would have
indicated that it's not actually using CONFIG_ISA.
Michael is worried about non-ISA drivers using inb() and friends.
At some point in time (i.e. eons ago), we were told it was better to
use in[bwl]()/read[bwl]() instead of directly dereferencing volatile
pointers...
It's definitely still better to use an abstraction layer for MMIO
accesses using inline asm instructions than open-coding the
volatile pointer dereferences. Over time we have gotten better
at defining which of the available abstractions should be used
for a given bus, so inb()/outb() is now only really used for
things derived from ISA in some form, including e.g. PCI and LPC.
Anyway, I don't think we have many users of inb() and friends left, and
I assume the bots should have detected any/most remaining users in Niklas'
branch...
arch/m68k/include/asm/floppy.h on Sun-3x might be the only offender?
Could be. I think we can leave this one to whoever tries to get
sun3x floppy support working, it's been marked broken for a while
(see below). If there are any others, they will cause pretty
obvious build failures once inb()/outb() are removed from the
build, and they should be trivial to fix then.
Arnd
commit f1e0f28a85001f4faa3ea930fcf201933f42340e
Author: akpm <akpm>
Date: Mon Jan 19 18:31:30 2004 +0000
[PATCH] M68k floppy selection
From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Floppy: On m68k, PC-style floppies are used on Q40/Q60 and Sun-3x only. Sun-3x
floppy is currently broken (needs I/O abstractions)
BKrev: 400c2282G1O-TsH5FiwzPbOorftQhg
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 2dce1d2699a9..32fdec34568e 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -6,7 +6,7 @@ menu "Block devices"
config BLK_DEV_FD
tristate "Normal floppy disk support"
- depends on !X86_PC9800 && !ARCH_S390
+ depends on (!X86_PC9800 && !ARCH_S390 && !M68K) || Q40 || (SUN3X && BROKEN)
---help---
If you want to use the floppy disk drive(s) of your PC under Linux,
say Y. Information about this driver, especially important for IBM
