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

From: [email-masked] (Bjorn Helgaas)
Date: Wed, 3 Feb 2016 09:59:20 -0600

Hi Bharat,

On Wed, Feb 03, 2016 at 03:40:21PM +0000, Bharat Kumar Gogada wrote:
> Ping

You said you were going to do another revision, so I'm waiting for r3.

> > 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 <[email-masked]>
> > Signed-off-by: Ravi Kiran Gummaluri <[email-masked]>
> > ---
> > 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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