linux-kernel - RE: [PATCH V4 5/5] Microblaze: Modifying microblaze PCI subsytem to support generic Xilinx AXI PCIe Host Bridge IP driver

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Message-ID: <8520D5D51A55D047800579B09414719825887D2E@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Tue, 8 Mar 2016 15:54:01 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Michal Simek <michals@...inx.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
	"paul.burton@...tec.com" <paul.burton@...tec.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"wangyijing@...wei.com" <wangyijing@...wei.com>,
	"robh@...nel.org" <robh@...nel.org>,
	"russell.joyce@...k.ac.uk" <russell.joyce@...k.ac.uk>,
	Soren Brinkmann <sorenb@...inx.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ravikiran Gummaluri <rgummal@...inx.com>
Subject: RE: [PATCH V4 5/5] Microblaze: Modifying microblaze PCI subsytem to
 support generic Xilinx AXI PCIe Host Bridge IP driver

Hi Bjorn,

Can you please take this in to your tree.

Thanks,
Bharat

> On 11.2.2016 17:28, Bharat Kumar Gogada wrote:
> > 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@...inx.com>
> > Signed-off-by: Ravi Kiran Gummaluri <rgummal@...inx.com>
> > ---
> > Changes:
> > Removed pcibios_get_phb_of_node in pci-common.c, using generic
> version
> > instead.
> > Modified pcibios_fixup_bus in pci-common.c, as per generic architecuture.
> > Modified pcibios_align_resource in pci-common.c, as per generic
> > architecuture, removed temporary variable.
> > 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 | 56 +++++++-------------------------------
> --
> >  drivers/pci/host/Kconfig         |  2 +-
> >  3 files changed, 14 insertions(+), 47 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..35654be 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
> > +872,18 @@ 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;
> > +	return res->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.
> > @@ -1333,13 +1304,6 @@ static void pcibios_setup_phb_resources(struct
> pci_controller *hose,
> >  		 (unsigned long)hose->io_base_virt - _IO_BASE);  }
> >
> > -struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) -{
> > -	struct pci_controller *hose = bus->sysdata;
> > -
> > -	return of_node_get(hose->dn);
> > -}
> > -
> >  static void pcibios_scan_phb(struct pci_controller *hose)  {
> >  	LIST_HEAD(resources);
> > 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.
> >
> 
> Less code in arch is better.
> 
> Acked-by: Michal Simek <michal.simek@...inx.com>
> 
> Bjorn: Please take this via your tree.
> 
> Thanks,
> Michal