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

From: [email-masked] (Michal Simek)
Date: Tue, 23 Feb 2016 12:08:34 +0100

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

Bjorn: Please take this via your tree.

Thanks,
Michal