From: "zhichang.yuan" <yuanzhichang@hisilicon.com>
To: Arnd Bergmann <arnd@arndb.de>, <linux-arm-kernel@lists.infradead.org>
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"minyard@acm.org" <minyard@acm.org>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
John Garry <john.garry@huawei.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"xuwei (O)" <xuwei5@hisilicon.com>,
Linuxarm <linuxarm@huawei.com>, "olof@lixom.net" <olof@lixom.net>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"zourongrong@gmail.com" <zourongrong@gmail.com>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"liviu.dudau@arm.com" <liviu.dudau@arm.com>,
"kantyzc@163.com" <kantyzc@163.com>,
"zhichang.yuan02@gmail.com" <zhichang.yuan02@gmail.com>
Subject: Re: [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06
Date: Thu, 10 Nov 2016 14:40:26 +0800 [thread overview]
Message-ID: <5824165A.4040303@hisilicon.com> (raw)
In-Reply-To: <2825537.ADCNsGqGxn@wuerfel>
Hi, Arnd,
On 2016/11/10 5:34, Arnd Bergmann wrote:
> On Wednesday, November 9, 2016 12:10:43 PM CET Gabriele Paoloni wrote:
>>> On Tuesday, November 8, 2016 11:47:09 AM CET zhichang.yuan wrote:
>>>> + /*
>>>> + * The first PCIBIOS_MIN_IO is reserved specifically for
>>> indirectIO.
>>>> + * It will separate indirectIO range from pci host bridge to
>>>> + * avoid the possible PIO conflict.
>>>> + * Set the indirectIO range directly here.
>>>> + */
>>>> + lpcdev->io_ops.start = 0;
>>>> + lpcdev->io_ops.end = PCIBIOS_MIN_IO - 1;
>>>> + lpcdev->io_ops.devpara = lpcdev;
>>>> + lpcdev->io_ops.pfin = hisilpc_comm_in;
>>>> + lpcdev->io_ops.pfout = hisilpc_comm_out;
>>>> + lpcdev->io_ops.pfins = hisilpc_comm_ins;
>>>> + lpcdev->io_ops.pfouts = hisilpc_comm_outs;
>>>
>>> I have to look at patch 2 in more detail again, after missing a few
>>> review
>>> rounds. I'm still a bit skeptical about hardcoding a logical I/O port
>>> range here, and would hope that we can just go through the same
>>> assignment of logical port ranges that we have for PCI buses,
>>> decoupling
>>> the bus addresses from the linux-internal ones.
>>
>> The point here is that we want to avoid any conflict/overlap between
>> the LPC I/O space and the PCI I/O space. With the assignment above
>> we make sure that LPC never interfere with PCI I/O space.
>
> But we already abstract the PCI I/O space using dynamic registration.
> There is no need to hardcode the logical address for ISA, though
> I think we can hardcode the bus address to start at zero here.
Do you means that we can pick up the maximal I/O address from all children's
device resources??
Thanks,
Zhichang
>
> Arnd
>
> .
>
next prev parent reply other threads:[~2016-11-10 6:41 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-08 3:47 [PATCH V5 0/3] ARM64 LPC: legacy ISA I/O support zhichang.yuan
2016-11-08 3:47 ` [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced zhichang.yuan
2016-11-08 12:03 ` Mark Rutland
2016-11-08 16:09 ` Arnd Bergmann
2016-11-08 16:15 ` Arnd Bergmann
2016-11-08 23:16 ` Benjamin Herrenschmidt
2016-11-10 8:33 ` zhichang.yuan
2016-11-10 11:22 ` Mark Rutland
2016-11-10 19:32 ` Benjamin Herrenschmidt
2016-11-11 10:07 ` zhichang.yuan
2016-11-18 9:20 ` Arnd Bergmann
2016-11-18 11:12 ` zhichang.yuan
2016-11-18 11:38 ` Arnd Bergmann
2016-11-21 12:58 ` John Garry
2016-11-08 16:12 ` Will Deacon
2016-11-08 16:33 ` John Garry
2016-11-08 16:49 ` Will Deacon
2016-11-08 17:05 ` John Garry
2016-11-08 22:35 ` Arnd Bergmann
2016-11-09 11:29 ` John Garry
2016-11-09 21:33 ` Arnd Bergmann
2016-12-22 8:15 ` Ming Lei
2016-12-23 1:43 ` zhichang.yuan
2016-12-23 7:24 ` Ming Lei
2017-01-06 11:43 ` Arnd Bergmann
2016-11-08 3:47 ` [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA zhichang.yuan
2016-11-08 5:17 ` kbuild test robot
2016-11-08 5:27 ` kbuild test robot
2016-11-08 11:49 ` Mark Rutland
2016-11-08 16:19 ` Arnd Bergmann
2016-11-08 17:10 ` Mark Rutland
2016-11-09 13:54 ` One Thousand Gnomes
2016-11-09 14:51 ` Gabriele Paoloni
2016-11-09 21:38 ` Arnd Bergmann
2016-11-14 11:11 ` One Thousand Gnomes
2016-11-18 9:22 ` Arnd Bergmann
2016-11-08 23:12 ` Benjamin Herrenschmidt
2016-11-09 11:20 ` Mark Rutland
2016-11-10 7:08 ` Benjamin Herrenschmidt
2016-11-09 11:39 ` liviu.dudau
2016-11-09 16:16 ` Gabriele Paoloni
2016-11-09 16:50 ` liviu.dudau
2016-11-10 6:24 ` zhichang.yuan
2016-11-10 16:06 ` Gabriele Paoloni
2016-11-11 10:37 ` liviu.dudau
2016-11-08 3:47 ` [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06 zhichang.yuan
2016-11-08 6:11 ` kbuild test robot
2016-11-08 16:24 ` Arnd Bergmann
2016-11-09 12:10 ` Gabriele Paoloni
2016-11-09 21:34 ` Arnd Bergmann
2016-11-10 6:40 ` zhichang.yuan [this message]
2016-11-10 9:12 ` Arnd Bergmann
2016-11-10 12:36 ` zhichang.yuan
2016-11-18 11:46 ` Arnd Bergmann
2016-11-10 15:36 ` Gabriele Paoloni
2016-11-10 16:07 ` Arnd Bergmann
2016-11-11 10:09 ` zhichang.yuan
2016-11-11 10:48 ` liviu.dudau
2016-11-11 13:39 ` Gabriele Paoloni
2016-11-11 14:45 ` liviu.dudau
2016-11-11 15:53 ` Gabriele Paoloni
2016-11-11 18:16 ` liviu.dudau
2016-11-14 8:26 ` Gabriele Paoloni
2016-11-14 11:26 ` liviu.dudau
2016-11-18 10:17 ` Arnd Bergmann
2016-11-18 12:07 ` Gabriele Paoloni
2016-11-18 12:24 ` Arnd Bergmann
2016-11-18 12:53 ` Gabriele Paoloni
2016-11-18 13:42 ` Arnd Bergmann
2016-11-18 16:18 ` Gabriele Paoloni
2016-11-18 16:34 ` Arnd Bergmann
2016-11-18 17:03 ` Gabriele Paoloni
2016-11-23 14:16 ` Arnd Bergmann
2016-11-23 15:22 ` Gabriele Paoloni
2016-11-23 17:07 ` Arnd Bergmann
2016-11-23 23:23 ` Arnd Bergmann
2016-11-24 9:12 ` zhichang.yuan
2016-11-24 10:24 ` Arnd Bergmann
2016-11-25 8:46 ` Gabriele Paoloni
2016-11-25 12:03 ` Arnd Bergmann
2016-11-25 16:27 ` Gabriele Paoloni
2016-11-11 16:54 ` zhichang.yuan
2016-11-14 11:06 ` One Thousand Gnomes
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