From: Jamie Lentin <jm@lentin.co.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Jason Cooper <jason@lakedaemon.net>,
devicetree@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Gregory Clement <gregory.clement@free-electrons.com>,
Imre Kaloz <kaloz@openwrt.org>,
linux-arm-kernel@lists.infradead.org,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Subject: Re: [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T
Date: Tue, 19 Jul 2016 10:40:16 +0100 (BST) [thread overview]
Message-ID: <alpine.DEB.2.11.1607191034240.19980@marmot.wormnet.eu> (raw)
In-Reply-To: <1792384.6N9lHjmBFc@wuerfel>
On Mon, 18 Jul 2016, Arnd Bergmann wrote:
> On Monday, July 18, 2016 11:44:24 AM CEST Thomas Petazzoni wrote:
>>
>> On Sun, 17 Jul 2016 22:41:35 +0200, Arnd Bergmann wrote:
>>
>>> I would assume that the PCIe port should work out of the box with the driver
>>
>> Unfortunately, no. The PCIe on Orion5x requires a workaround for
>> reading/writing the PCI configuration space. Instead of doing MMIO
>> accesses to PCIE_CONF_ADDR_OFF / PCIE_CONF_DATA_OFF, you must map a
>> MBus window, which provides a memory-mapped view of the PCI
>> configuration space.
>>
>> Definitely not impossible to implement, but the driver doesn't work
>> as-is.
>
> Ok.
Unfortunately this isn't something I can test as the PCIe port on the SoC
doesn't go anywhere in my case.
>>> We also don't seem to need any MBUS window setup for the I/O and
>>> memory spaces, which greatly simplifies the driver compared to the
>>> pci-mvebu one, it would be a fairly straightforward implementation
>>> based on pci-host-generic.c (which unfortunately just got way
>>> more complicated and might need to go on a diet).
>>
>> MBus windows are needed. See:
>>
>> mvebu_mbus_add_window_remap_by_id(ORION_MBUS_PCI_IO_TARGET,
>> ORION_MBUS_PCI_IO_ATTR,
>> ORION5X_PCI_IO_PHYS_BASE,
>> ORION5X_PCI_IO_SIZE,
>> ORION5X_PCI_IO_BUS_BASE);
>> mvebu_mbus_add_window_by_id(ORION_MBUS_PCI_MEM_TARGET,
>> ORION_MBUS_PCI_MEM_ATTR,
>> ORION5X_PCI_MEM_PHYS_BASE,
>> ORION5X_PCI_MEM_SIZE);
>>
>> in orion5x_setup_wins().
>
> Ok, I was just looking at the wrong file, as they are set up from
> common.c, not pci.c.
>
>> Note that we already have some Orion5x converted to DT, and that use
>> PCI: board-rd88f5182.c is an example. So we could very well take Jamie
>> patches as-is, and move later to a DT-representation for PCI/PCIe.
>
> Ah, I thought all the DT users were moved to mach-mvebu. I agree
> this new patch isn't introducing anything we don't already have then,
> so we can just take it, but the conversion will not be nice when
> we do that.
Yes, board-wnr854t.c is a clone of the existing board-rd88f5182.c.
Although I'd presume that it too would need late_initcall() or somesuch
mechanism to probe PCI once the GPIO controller is available.
> I was also hoping that we could get to the point where pci_common_init()
> is only used for legacy machines without DT and without multiplatform,
> it seems I missed a couple of users here.
>
> Arnd
>
--
Jamie Lentin
next prev parent reply other threads:[~2016-07-19 10:03 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-16 14:28 [PATCH v0 00/10] Convert Netgear WNR854T to devicetree Jamie Lentin
2016-07-16 14:28 ` [PATCH v0 01/10] arm: orion5x: Add required properties for orion-wdt to DT node Jamie Lentin
2016-07-16 16:03 ` Andrew Lunn
2016-07-16 14:29 ` [PATCH v0 02/10] arm: orion5x: Add documentation for SoC and board bindings Jamie Lentin
2016-07-16 16:05 ` Andrew Lunn
2016-07-17 20:35 ` Rob Herring
2016-07-16 14:29 ` [PATCH v0 03/10] arm: orion5x: Add clk support for mv88f5181 Jamie Lentin
2016-07-16 16:10 ` Andrew Lunn
2016-07-16 17:34 ` Sergei Shtylyov
2016-07-17 20:36 ` Rob Herring
2016-07-16 14:29 ` [PATCH v0 04/10] arm: orion5x: Generalise mv88f5181l pinctrl support for 88f5181 Jamie Lentin
2016-07-16 16:15 ` Andrew Lunn
2016-07-17 20:40 ` Rob Herring
2016-07-16 14:29 ` [PATCH v0 05/10] arm: orion5x: Add DT include for mv88f5181 Jamie Lentin
2016-07-16 16:17 ` Andrew Lunn
2016-07-17 20:41 ` Rob Herring
2016-07-16 14:29 ` [PATCH v0 06/10] arm: orion5x: Add DT-based support for Netgear WNR854T Jamie Lentin
2016-07-16 16:34 ` Andrew Lunn
2016-07-16 16:39 ` Andrew Lunn
2016-07-16 19:10 ` Arnd Bergmann
2016-07-17 9:39 ` Jamie Lentin
2016-07-17 20:41 ` Arnd Bergmann
2016-07-18 9:44 ` Thomas Petazzoni
2016-07-18 10:06 ` Arnd Bergmann
2016-07-19 9:40 ` Jamie Lentin [this message]
2016-07-19 9:46 ` Arnd Bergmann
2016-07-17 20:51 ` Rob Herring
2016-07-19 9:46 ` Jamie Lentin
2016-07-16 14:29 ` [PATCH v0 07/10] arm: orion5x: Remove old non-DT-based WNR854T support Jamie Lentin
2016-07-16 16:36 ` Andrew Lunn
2016-07-16 14:29 ` [PATCH v0 08/10] net: phy: Try looking for a phy-handle property to find the OF node Jamie Lentin
2016-07-16 16:44 ` Andrew Lunn
2016-07-16 14:29 ` [PATCH v0 09/10] net: phy: Re-attempt custom DT configuration after configuration Jamie Lentin
2016-07-16 16:44 ` Andrew Lunn
2016-07-16 14:29 ` [PATCH v0 10/10] arm: orion5x: Configure Netgear WNR854T network port LEDs Jamie Lentin
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