linux-kernel - Re: [PATCH 1/2] pata_legacy: export functionality to ide

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Message-ID: <9ea470500808050732s7be29360ge358790e955be06a@mail.gmail.com>
Date:	Tue, 5 Aug 2008 16:32:25 +0200
From:	"Boris Petkov" <petkovbb@...glemail.com>
To:	"Sergei Shtylyov" <sshtylyov@...mvista.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>, bzolnier@...il.com,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 1/2] pata_legacy: export functionality to ide

On Tue, Aug 5, 2008 at 4:26 PM, Sergei Shtylyov <sshtylyov@...mvista.com> wrote:
> Hello.
>
> Borislav Petkov wrote:
>
>> Avoid probing the io-ports in case an IDE PCI controller is present and it
>> uses
>> the legacy iobases. If we still want to enforce the probing, we do
>
>> ide_generic.probe_mask=0x3f
>
>> on the kernel command line. The iobase checking code is adapted from
>> drivers/ata/pata_legacy.c
>
>> Signed-off-by: Borislav Petkov <petkovbb@...il.com>
>
>> diff --git a/drivers/ide/ide-generic.c b/drivers/ide/ide-generic.c
>> index 8fe8b5b..e9b7b69 100644
>> --- a/drivers/ide/ide-generic.c
>> +++ b/drivers/ide/ide-generic.c
>
> [...]
>>
>> @@ -100,19 +100,71 @@ static const u16 legacy_bases[] = { 0x1f0, 0x170,
>> 0x1e8, 0x168, 0x1e0, 0x160 };
>>  static const int legacy_irqs[]  = { 14, 15, 11, 10, 8, 12 };
>>  #endif
>>  +
>
>   Extra newline...
>
>> +static void ide_generic_check_pci_legacy_iobases(int *primary, int
>> *secondary)
>> +{
>> +       struct pci_dev *p = NULL;
>> +       u16 val;
>> +
>> +       for_each_pci_dev(p) {
>> +               int r;
>> +
>> +               for (r = 0; r < 6; r++) {
>> +                       if (pci_resource_start(p, r) == 0x1f0)
>> +                               *primary = 1;
>> +                       if (pci_resource_start(p, r) == 0x170)
>> +                               *secondary = 1;
>> +               }
>> +
>> +               /* Cyrix CS5510 pre SFF MWDMA ATA on the bridge */
>> +               if (p->vendor == 0x1078 && p->device == 0x0000)
>> +                       *primary = *secondary = 1;
>> +
>> +               /* Cyrix CS5520 pre SFF MWDMA ATA on the bridge */
>> +               if (p->vendor == 0x1078 && p->device == 0x0002)
>> +                       *primary = *secondary = 1;
>
>   I think the above two if statements should be collapsed into a single one.

This is code is actually from the pata_legacy.c but yep, you're right,
those can merge.

>
>> +
>> +               /* Intel MPIIX - PIO ATA on non PCI side of bridge */
>> +               if (p->vendor == 0x8086 && p->device == 0x1234) {
>
>   Also, perhaps it makes sense to #include <linux/pci_ids.h> and use the
> macros defined there...

Will look into it later and redo the patch, thanks for reviewing. I
still haven't heard from
Bart, though, whether he's OK with the code duplication...?

-- 
Regards/Gruß,
Boris
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