linux-kernel - Re: [PATCH] arm64: Add architecture support for PCI

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Date:	Mon, 3 Feb 2014 22:34:40 +0000
From:	Andrew Murray <amurray@...edded-bits.co.uk>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arm64: Add architecture support for PCI

On 3 February 2014 18:43, Liviu Dudau <Liviu.Dudau@....com> wrote:
> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
> index 4cc813e..ce5bad2 100644
> --- a/arch/arm64/include/asm/io.h
> +++ b/arch/arm64/include/asm/io.h
> @@ -120,9 +120,13 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
>  /*
>   *  I/O port access primitives.
>   */
> +#define arch_has_dev_port()    (0)
>  #define IO_SPACE_LIMIT         0xffff
>  #define PCI_IOBASE             ((void __iomem *)(MODULES_VADDR - SZ_2M))
>
> +#define ioport_map(port, nr)   (PCI_IOBASE + ((port) & IO_SPACE_LIMIT))
> +#define ioport_unmap(addr)

I'm not sure that this will work. The in[bwl], out[bwl] macros in
arch/arm64/include/asm/io.h already add the PCI_IOBASE offset.

Instead of these two #defines, why not just enforce that
GENERIC_PCI_IOMAP is enabled? Or at least wrap these defines with 'if
(!config_enabled(CONFIG_GENERIC_PCI_IOMAP))' or similar.

> +
>  static inline u8 inb(unsigned long addr)
>  {
>         return readb(addr + PCI_IOBASE);


Andrew Murray
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