RE: [PATCH V2 5/5] Microblaze: Modifying microblaze PCI subsytem to support generic Xilinx AXI PCIe Host Bridge IP driver

Bharat Kumar Gogada
2016-02-03T16:09:08Z

> You said you were going to do another revision, so I'm waiting for r3.
Hi Bjorn,
Do you have any comments on this patch (5/5), I will address other patches comments along with this patch, if any, in v3.

Bharat
>
> > > This patch does required modifications to microblaze PCI subsystem,
> > > to work with generic driver (drivers/pci/host/pcie-xilinx.c) on
> > > Microblaze and Zynq.
> > >
> > > Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com>
> > > Signed-off-by: Ravi Kiran Gummaluri <rgummal@xilinx.com>
> > > ---
> > > Changes:
> > > Modified pcibios_fixup_bus in pci-common.c, as per generic
> architecuture.
> > > Modified pcibios_align_resource in pci-common.c, as per generic
> > > architecuture.
> > > Modified pcibios_get_phb_of_node function in pci-common.c, to
> remove
> > > dependency on struct pci_controller.
> > > Removed pci_domain_nr in pci-common.c, instead using generic code.
> > > Added pcibios_add_device in pci-common.c, as per generic
> architecuture.
> > > Adding Kernel configuration in arch/microblaze as required for
> > > generic PCI domains.
> > > Added kernel configuration for driver to support Microblaze.
> > > ---
> > > arch/microblaze/Kconfig | 3 ++
> > > arch/microblaze/pci/pci-common.c | 61
> > > +++++++++++++++--------------------
> > > -----
> > > drivers/pci/host/Kconfig | 2 +-
> > > 3 files changed, 27 insertions(+), 39 deletions(-)
> > >
> > > diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index
> > > 0bce820..c3702b9 100644
> > > --- a/arch/microblaze/Kconfig
> > > +++ b/arch/microblaze/Kconfig
> > > @@ -271,6 +271,9 @@ config PCI
> > > config PCI_DOMAINS
> > > def_bool PCI
> > >
> > > +config PCI_DOMAINS_GENERIC
> > > + def_bool PCI_DOMAINS
> > > +
> > > config PCI_SYSCALL
> > > def_bool PCI
> > >
> > > diff --git a/arch/microblaze/pci/pci-common.c
> > > b/arch/microblaze/pci/pci- common.c index ae838ed..bc72856 100644
> > > --- a/arch/microblaze/pci/pci-common.c
> > > +++ b/arch/microblaze/pci/pci-common.c
> > > @@ -123,17 +123,6 @@ unsigned long pci_address_to_pio(phys_addr_t
> > > address)
> > > }
> > > EXPORT_SYMBOL_GPL(pci_address_to_pio);
> > >
> > > -/*
> > > - * Return the domain number for this bus.
> > > - */
> > > -int pci_domain_nr(struct pci_bus *bus) -{
> > > - struct pci_controller *hose = pci_bus_to_host(bus);
> > > -
> > > - return hose->global_number;
> > > -}
> > > -EXPORT_SYMBOL(pci_domain_nr);
> > > -
> > > /* This routine is meant to be used early during boot, when the
> > > * PCI bus numbers have not yet been assigned, and you need to
> > > * issue PCI config cycles to an OF device.
> > > @@ -863,26 +852,10 @@ void pcibios_setup_bus_devices(struct pci_bus
> > > *bus)
> > >
> > > void pcibios_fixup_bus(struct pci_bus *bus) {
> > > - /* When called from the generic PCI probe, read PCI<->PCI bridge
> > > - * bases. This is -not- called when generating the PCI tree from
> > > - * the OF device-tree.
> > > - */
> > > - if (bus->self != NULL)
> > > - pci_read_bridge_bases(bus);
> > > -
> > > - /* Now fixup the bus bus */
> > > - pcibios_setup_bus_self(bus);
> > > -
> > > - /* Now fixup devices on that bus */
> > > - pcibios_setup_bus_devices(bus);
> > > + /* nothing to do */
> > > }
> > > EXPORT_SYMBOL(pcibios_fixup_bus);
> > >
> > > -static int skip_isa_ioresource_align(struct pci_dev *dev) -{
> > > - return 0;
> > > -}
> > > -
> > > /*
> > > * We need to avoid collisions with `mirrored' VGA ports
> > > * and other strange ISA hardware, so we always want the @@ -899,20
> > > +872,20 @@ static int skip_isa_ioresource_align(struct pci_dev
> > > *dev)
> > > resource_size_t pcibios_align_resource(void *data, const struct
> > > resource *res,
> > > resource_size_t size, resource_size_t align) {
> > > - struct pci_dev *dev = data;
> > > resource_size_t start = res->start;
> > >
> > > - if (res->flags & IORESOURCE_IO) {
> > > - if (skip_isa_ioresource_align(dev))
> > > - return start;
> > > - if (start & 0x300)
> > > - start = (start + 0x3ff) & ~0x3ff;
> > > - }
> > > -
> > > return start;
> > > }
> > > EXPORT_SYMBOL(pcibios_align_resource);
> > >
> > > +int pcibios_add_device(struct pci_dev *dev) {
> > > + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
> > > +
> > > + return 0;
> > > +}
> > > +EXPORT_SYMBOL(pcibios_add_device);
> > > +
> > > /*
> > > * Reparent resource children of pr that conflict with res
> > > * under res, and make res replace those children.
> > > @@ -1335,9 +1308,21 @@ static void
> > > pcibios_setup_phb_resources(struct
> > > pci_controller *hose,
> > >
> > > struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) {
> > > - struct pci_controller *hose = bus->sysdata;
> > > + struct device_node *np;
> > > +
> > > + for_each_node_by_type(np, "pci") {
> > > + const void *prop;
> > > + unsigned int bus_min;
> > > +
> > > + prop = of_get_property(np, "bus-range", NULL);
> > > + if (!prop)
> > > + continue;
> > > + bus_min = be32_to_cpup(prop);
> > > + if (bus->number == bus_min)
> > > + return np;
> > > + }
> > >
> > > - return of_node_get(hose->dn);
> > > + return NULL;
> > > }
> > >
> > > static void pcibios_scan_phb(struct pci_controller *hose) diff
> > > --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index
> > > d5e58ba..7c56c2e 100644
> > > --- a/drivers/pci/host/Kconfig
> > > +++ b/drivers/pci/host/Kconfig
> > > @@ -79,7 +79,7 @@ config PCI_KEYSTONE
> > >
> > > config PCIE_XILINX
> > > bool "Xilinx AXI PCIe host bridge support"
> > > - depends on ARCH_ZYNQ
> > > + depends on ARCH_ZYNQ || MICROBLAZE
> > > help
> > > Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
> > > Host Bridge driver.
> > > --
> > > 2.1.1
> >
> > --
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