From: Sergei Shtylyov <sshtylyov@mvista.com>
To: Gabor Juhos <juhosg@openwrt.org>
Cc: Ralf Baechle <ralf@linux-mips.org>,
linux-mips <linux-mips@linux-mips.org>,
John Crispin <blogic@openwrt.org>
Subject: Re: [PATCH 3/4] MIPS: pci-ar724x: remove static PCI IO/MEM resources
Date: Mon, 04 Feb 2013 16:13:23 +0400 [thread overview]
Message-ID: <510FA5E3.4010403@mvista.com> (raw)
In-Reply-To: <510E58B5.9060107@openwrt.org>
Hello.
On 03-02-2013 16:31, Gabor Juhos wrote:
>>> @@ -160,6 +163,16 @@ ath79_register_pci_ar724x(int id,
>>> res[2].start = irq;
>>> res[2].end = irq;
>>>
>>> + res[3].name = "mem_base";
>>> + res[3].flags = IORESOURCE_MEM;
>>> + res[3].start = mem_base;
>>> + res[3].end = mem_base + mem_size - 1;
>>> +
>>> + res[4].name = "io_base";
>>> + res[4].flags = IORESOURCE_IO;
>>> + res[4].start = io_base;
>>> + res[4].end = io_base;
>>
>> One I/O port, hm? What is it good for?
> Strictly speaking it is not good for anything. This is a PCIe controller and it
> does not support IO requests at all.
Is this the case with every PCIe controller or only this particular one?
> However the whole PCI code assumes that
> each PCI controller have an IO resource and uses the hose->io_resource pointer
> unconditionally.
> Additionally, this matches with the removed static resource:
>> -static struct resource ar724x_io_resource = {
>> - .name = "PCI IO space",
>> - .start = 0,
>> - .end = 0,
>> - .flags = IORESOURCE_IO,
>> -};
>> -
Since you seems to always pass 0, maybe you don't need 'io_base' parameter
to the function above?
> -Gabor
WBR, Sergei
next prev parent reply other threads:[~2013-02-04 12:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-03 10:58 [PATCH 1/4] MIPS: ath79: allow to specify bus number in PCI IRQ maps Gabor Juhos
2013-02-03 10:58 ` [PATCH 2/4] MIPS: pci-ar724x: use dynamically allocated PCI controller structure Gabor Juhos
2013-02-03 10:59 ` [PATCH 3/4] MIPS: pci-ar724x: remove static PCI IO/MEM resources Gabor Juhos
2013-02-03 11:18 ` Sergei Shtylyov
2013-02-03 12:31 ` Gabor Juhos
2013-02-04 12:13 ` Sergei Shtylyov [this message]
2013-02-04 13:14 ` Gabor Juhos
2013-02-03 11:00 ` [PATCH 4/4] MIPS: pci-ar724x: use per-controller IRQ base Gabor Juhos
2013-02-03 15:52 ` [PATCH 5/4] MIPS: pci-ar724x: setup command register of the PCI controller Gabor Juhos
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