From: Michael Schmitz <schmitzmic@gmail.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linux/m68k <linux-m68k@vger.kernel.org>,
linux-ide@vger.kernel.org, fthain@linux-m68k.org
Subject: Re: [PATCH RFC 2/2] m68k: setup_mm.c: set isa_sex for Atari if ATARI_ROM_ISA not used
Date: Wed, 2 Jun 2021 20:21:08 +1200 [thread overview]
Message-ID: <ea80060f-983b-8adb-93f9-e2b84ea5f4b5@gmail.com> (raw)
In-Reply-To: <CAMuHMdWhdSVCktaVZY+XHeyfeP8uw-RAcOWe--HsBn9Qf5_NOQ@mail.gmail.com>
Hi Geert,
Am 02.06.2021 um 19:09 schrieb Geert Uytterhoeven:
> Hi Michael,
>
> On Wed, Jun 2, 2021 at 7:21 AM Michael Schmitz <schmitzmic@gmail.com> wrote:
>> For multiplatform kernels where CONFIG_ATARI_ROM_ISA is not set,
>> at least isa_sex must be set correctly to allow for correct I/O
>> primitive selection in shared drivers.
>>
>> Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
>
> Thanks for your patch!
>
>
>> --- a/arch/m68k/kernel/setup_mm.c
>> +++ b/arch/m68k/kernel/setup_mm.c
>> @@ -386,6 +386,10 @@ void __init setup_arch(char **cmdline_p)
>> isa_type = ISA_TYPE_ENEC;
>> isa_sex = 0;
>> }
>> +#else
>> + if (MACH_IS_ATARI) {
>> + isa_sex = 0;
>
> I find it strange that you set isa_sex, but not isa_type?
Yes, as I said this is only to ensure isa_sex has the correct value (0)
so isa_readw() resolves to in_le16() for the Atari IDE driver after the
change at the end of the first patch. Might have been better to rather say
int isa_sex=0;
at the start of setup_mm.c ... or rely on that variable being
initialized as zero anyway.
> However, this is inside the CONFIG_ISA && MULTI_ISA block, so
> what kind of ISA does this correspond to?
No ISA at all in that case, but since we have to route all readw() calls
through isa_readw() for the sake of generality if we want to support Q40
ISA and Atari MMIO in the same kernel image, we need to make sure
isa_readw() does the right thing on Atari if CONFIG_ISA is set.
I know io_mm.h says it's about various ISA bridges, but as I found out,
drivers using only MMIO are also affected by these definitions.
'Maze' does not begin to describe it, 'mess' might be getting closer,
but I can't see how we would avoid use of definitions in io_mm.h by
non-ISA drivers.
Cheers,
Michael
>
>> + }
>> #endif
>> #endif
>
> Gr{oetje,eeting}s,
>
> Geert
>
next prev parent reply other threads:[~2021-06-02 8:21 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAMuHMdUskb3oicq8Kbf6MY_4mn4-Y1pJ-om4fny7k48gndscgg@mail.gmail.com>
2021-06-02 5:21 ` [PATCH RFC 0/2] Fix m68k multiplatform ISA support Michael Schmitz
2021-06-02 5:21 ` [PATCH RFC 1/2] m68k: io_mm.h: conditionalize ISA address translation on Atari Michael Schmitz
2021-06-03 8:23 ` Finn Thain
2021-06-04 0:19 ` Michael Schmitz
2021-06-04 5:55 ` Finn Thain
2021-06-04 7:30 ` Michael Schmitz
2021-06-04 22:49 ` Brad Boyer
2021-06-05 1:41 ` Michael Schmitz
2021-06-05 6:04 ` Brad Boyer
2021-06-05 22:05 ` Michael Schmitz
2021-06-06 2:18 ` Michael Schmitz
2021-06-06 4:53 ` Finn Thain
2021-06-06 5:42 ` Michael Schmitz
2021-06-06 23:51 ` Brad Boyer
2021-06-06 5:54 ` [PATCH RFC 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-06 5:54 ` [PATCH RFC 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-07 8:01 ` Geert Uytterhoeven
2021-06-07 8:20 ` Michael Schmitz
2021-06-07 11:15 ` Geert Uytterhoeven
2021-06-07 19:57 ` Michael Schmitz
2021-06-08 6:42 ` Geert Uytterhoeven
2021-06-08 21:55 ` Michael Schmitz
2021-06-09 6:33 ` Geert Uytterhoeven
2021-06-08 21:56 ` Michael Schmitz
2021-06-06 5:54 ` [PATCH RFC 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-07 8:08 ` Geert Uytterhoeven
2021-06-07 8:40 ` Michael Schmitz
2021-06-07 8:46 ` ALeX Kazik
2021-06-08 3:10 ` Michael Schmitz
2021-06-07 8:37 ` Geert Uytterhoeven
2021-06-07 12:56 ` Geert Uytterhoeven
2021-06-09 7:36 ` [PATCH v1 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-09 7:36 ` [PATCH v1 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-09 8:04 ` Andreas Schwab
2021-06-09 21:54 ` Michael Schmitz
2021-06-10 1:09 ` Finn Thain
2021-06-10 7:32 ` Geert Uytterhoeven
2021-06-11 2:15 ` Michael Schmitz
2021-06-10 8:53 ` Andreas Schwab
2021-06-09 7:36 ` [PATCH v1 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-10 2:09 ` [PATCH v2 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-10 2:09 ` [PATCH v2 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-10 2:09 ` [PATCH v2 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-16 21:11 ` [PATCH v2 0/2] Add APNE PCMCIA 100 Mbit support ALeX Kazik
2021-06-17 1:10 ` Michael Schmitz
2021-06-04 7:54 ` [PATCH RFC 1/2] m68k: io_mm.h: conditionalize ISA address translation on Atari Geert Uytterhoeven
2021-06-04 21:36 ` Michael Schmitz
2021-06-04 23:31 ` Finn Thain
2021-06-05 0:24 ` Finn Thain
2021-06-05 3:48 ` Michael Schmitz
2021-06-09 6:35 ` Geert Uytterhoeven
2021-06-09 7:20 ` Michael Schmitz
2021-06-02 5:21 ` [PATCH RFC 2/2] m68k: setup_mm.c: set isa_sex for Atari if ATARI_ROM_ISA not used Michael Schmitz
2021-06-02 7:09 ` Geert Uytterhoeven
2021-06-02 8:21 ` Michael Schmitz [this message]
2021-06-03 8:29 ` Finn Thain
2021-06-04 3:02 ` Michael Schmitz
2021-06-06 5:28 ` [PATCH] m68k: Fix multiplatform ISA support Michael Schmitz
2021-06-07 7:49 ` Geert Uytterhoeven
2021-06-07 8:17 ` Michael Schmitz
2021-06-09 7:22 ` [PATCH v2] m68k: io_mm.h: conditionalize ISA address translation on Atari Michael Schmitz
2021-06-09 7:57 ` Andreas Schwab
2021-06-09 21:43 ` Michael Schmitz
2021-06-10 2:04 ` [PATCH v3] " Michael Schmitz
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