Message-ID: <CA+b37P0XV81K4oBNnkXrVHYub=Bcuuw8nrFWUGVw-i8PJ8wGxQ@mail.gmail.com>
Date:	Tue, 22 Apr 2014 17:20:40 +0530
From:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Tanmay Inamdar <tinamdar@....com>
Subject: Re: [PATCH v7 0/3] Add support for PCI in AArch64

On 22 April 2014 15:41, Liviu Dudau <Liviu.Dudau@....com> wrote:
> On Tue, Apr 22, 2014 at 09:58:28AM +0100, Sandeepa Prabhu wrote:
>> On 14 March 2014 21:04, Liviu Dudau <Liviu.Dudau@....com> wrote:
>> > Hi,
>> >
>> > This patch adds support for PCI to AArch64. It is based on my v7 patch
>> > that adds support for creating generic host bridge structure from
>> > device tree. With that in place, I was able to boot a platform that
>> > has PCIe host bridge support and use a PCIe network card.
>> Hi Liviu,
>>
>> Are these patches (including your other patchset for device tree host
>> bridge support ) available on a public git repo I can checkout from?
>
> Yes, I have pushed them into git://linux-arm.org/linux-ld.git
Thanks Liviu,
Just to understand, is the X-gene PCIe
(https://lwn.net/Articles/589733/) verified using the same patchset?

~Sandeepa
>
> Best regards,
> Liviu
>
>>
>> Thanks,
>> ~Sandeepa
>>
>> >
>> > I have dropped the RFC tag from the subject as I now have the ambitious goal
>> > of trying to get it mainlined.
>> >
>> > Changes from v6:
>> >   - Guard the pci_domain_nr() inline implementation with #ifdef CONFIG_PCI as
>> >     to avoid conflict with default empty version present in include/linux/pci.h.
>> >     Thanks to Jingoo Han for catching this.
>> >
>> > Changes from v5:
>> >   - Removed pcibios_fixup_bridge_ranges() as the week default version is fine.
>> >   - Removed the ALIGN() call in pcibios_align_resource()
>> >   - Stopped exporting pcibios_align_resource()
>> >
>> > Changes from v4:
>> >   - Fixed the pci_domain_nr() implementation for arm64. Now we use
>> >     find_pci_host_bride() to find the host bridge before we retrieve
>> >     the domain number.
>> >
>> > Changes from v3:
>> >   - Added Acks accumulated so far ;)
>> >   - Still carrying Catalin's patch for moving the PCI_IO_BASE until it
>> >     lands in linux-next or mainline, in order to ease applying the series
>> >
>> > Changes from v2:
>> >   - Implement an arch specific version of pci_register_io_range() and
>> >     pci_address_to_pio().
>> >   - Return 1 from pci_proc_domain().
>> >
>> > Changes from v1:
>> >   - Added Catalin's patch for moving the PCI_IO_BASE location and extend
>> >     its size to 16MB
>> >   - Integrated Arnd's version of pci_ioremap_io that uses a bitmap for
>> >     keeping track of assigned IO space and returns an io_offset. At the
>> >     moment the code is added in arch/arm64 but it can be moved in drivers/pci.
>> >   - Added a fix for the generic ioport_map() function when !CONFIG_GENERIC_IOMAP
>> >     as suggested by Arnd.
>> >
>> > v6 thread here: https://lkml.org/lkml/2014/3/5/41
>> > v5 thread here: https://lkml.org/lkml/2014/3/4/307
>> > v4 thread here: https://lkml.org/lkml/2014/3/3/298
>> > v3 thread here: https://lkml.org/lkml/2014/2/28/211
>> > v2 thread here: https://lkml.org/lkml/2014/2/27/255
>> > v1 thread here: https://lkml.org/lkml/2014/2/3/389
>> >
>> >
>> > The API used is different from the one used by ARM architecture. There is
>> > no pci_common_init_dev() function and no hw_pci structure, as that is no
>> > longer needed. Once the last signature is added to the legal agreement, I
>> > will post the host bridge driver code that I am using. Meanwhile, here
>> > is an example of what the probe function looks like, posted as an example:
>> >
>> > static int myhostbridge_probe(struct platform_device *pdev)
>> > {
>> >         int err;
>> >         struct device_node *dev;
>> >         struct pci_host_bridge *bridge;
>> >         struct myhostbridge_port *pp;
>> >         resource_size_t lastbus;
>> >
>> >         dev = pdev->dev.of_node;
>> >
>> >         if (!of_device_is_available(dev)) {
>> >                 pr_warn("%s: disabled\n", dev->full_name);
>> >                 return -ENODEV;
>> >         }
>> >
>> >         pp = kzalloc(sizeof(struct myhostbridge_port), GFP_KERNEL);
>> >         if (!pp)
>> >                 return -ENOMEM;
>> >
>> >         bridge = of_create_pci_host_bridge(&pdev->dev, &myhostbridge_ops, pp);
>> >         if (IS_ERR(bridge)) {
>> >                 err = PTR_ERR(bridge);
>> >                 goto bridge_create_fail;
>> >         }
>> >
>> >         err = myhostbridge_setup(bridge->bus);
>> >         if (err)
>> >                 goto bridge_setup_fail;
>> >
>> >         /* We always enable PCI domains and we keep domain 0 backward
>> >          * compatible in /proc for video cards
>> >          */
>> >         pci_add_flags(PCI_ENABLE_PROC_DOMAINS);
>> >         pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);
>> >
>> >         lastbus = pci_scan_child_bus(bridge->bus);
>> >         pci_bus_update_busn_res_end(bridge->bus, lastbus);
>> >
>> >         pci_assign_unassigned_bus_resources(bridge->bus);
>> >
>> >         pci_bus_add_devices(bridge->bus);
>> >
>> >         return 0;
>> >
>> > bridge_setup_fail:
>> >         put_device(&bridge->dev);
>> >         device_unregister(&bridge->dev);
>> > bridge_create_fail:
>> >         kfree(pp);
>> >         return err;
>> > }
>> >
>> > Best regards,
>> > Liviu
>> >
>> >
>> > Catalin Marinas (1):
>> >   arm64: Extend the PCI I/O space to 16MB
>> >
>> > Liviu Dudau (2):
>> >   Fix ioport_map() for !CONFIG_GENERIC_IOMAP cases.
>> >   arm64: Add architecture support for PCI
>> >
>> >  Documentation/arm64/memory.txt |  16 +--
>> >  arch/arm64/Kconfig             |  19 +++-
>> >  arch/arm64/include/asm/Kbuild  |   1 +
>> >  arch/arm64/include/asm/io.h    |   5 +-
>> >  arch/arm64/include/asm/pci.h   |  51 +++++++++
>> >  arch/arm64/kernel/Makefile     |   1 +
>> >  arch/arm64/kernel/pci.c        | 173 +++++++++++++++++++++++++++++++
>> >  include/asm-generic/io.h       |   2 +-
>> >  8 files changed, 258 insertions(+), 10 deletions(-)
>> >  create mode 100644 arch/arm64/include/asm/pci.h
>> >  create mode 100644 arch/arm64/kernel/pci.c
>> >
>> > --
>> > 1.9.0
>> >
>> >
>> > _______________________________________________
>> > linux-arm-kernel mailing list
>> > linux-arm-kernel@...ts.infradead.org
>> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>
> --
> ====================
> | I would like to |
> | fix the world,  |
> | but they're not |
> | giving me the   |
>  \ source code!  /
>   ---------------
>     ¯\_(ツ)_/¯
>
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