linux-kernel - Re: [PATCH v1 1/3] ARM64 LPC: indirect ISA PORT IO introduced

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Date:	Tue, 29 Dec 2015 15:35:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rongrong Zou <zourongrong@...wei.com>
Cc:	Rongrong Zou <zourongrong@...il.com>, minyard@....org,
	gregkh@...uxfoundation.org, catalin.marinas@....com,
	will.deacon@....com, linuxarm@...wei.com,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	lijianhua@...wei.com
Subject: Re: [PATCH v1 1/3] ARM64 LPC: indirect ISA PORT IO introduced

On Tuesday 29 December 2015 22:26:27 Rongrong Zou wrote:
> 在 2015/12/29 21:47, Arnd Bergmann 写道:
> > On Tuesday 29 December 2015 21:33:50 Rongrong Zou wrote:
> >> Indirect ISA port I/O accessing introduced, vendors can hook
> >> their own in/out function to general inb/outb. Drivers can access
> >> legacy ISA I/O port by inb/outb as it is done in x86 platform.
> >>
> >> Signed-off-by: Rongrong Zou <zourongrong@...il.com>
> >
> > Looks correct to me, but I have a few style comments
> >
> >> ---
> >>   arch/arm64/Kconfig.platforms |  5 ++-
> >>   arch/arm64/include/asm/io.h  | 78 ++++++++++++++++++++++++++++++++++++++++++++
> >>   arch/arm64/kernel/setup.c    |  5 +++
> >>   3 files changed, 87 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> >> index 4043c35..98ae206 100644
> >> --- a/arch/arm64/Kconfig.platforms
> >> +++ b/arch/arm64/Kconfig.platforms
> >> @@ -127,5 +127,8 @@ config ARCH_ZYNQMP
> >>   	bool "Xilinx ZynqMP Family"
> >>   	help
> >>   	  This enables support for Xilinx ZynqMP Family
> >> -
> >> +config ARM64_INDIRECT_PIO
> >> +	bool "ARM64 Indirect port I/O"
> >> +	help
> >> +	  This enables support for ARM64 indirect port I/O
> >>   endmenu
> >
> > The option should probably go into arch/arm64/Kconfig. Possibly you can make
> > it a silent option that just gets selected whenever a driver is enabled
> > that might set the callbacks.
> 
> I try to bind it with HISILICON platform.

It should be possible to build the actual driver on all platforms, at
least with COMPILE_TEST.

> >> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
> >> index 44be1e0..0041f3b 100644
> >> --- a/arch/arm64/include/asm/io.h
> >> +++ b/arch/arm64/include/asm/io.h
> >> @@ -193,6 +193,84 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
> >>    */
> >>   #define xlate_dev_kmem_ptr(p)	p
> >>
> >> +#ifdef CONFIG_ARM64_INDIRECT_PIO
> >> +#define DEF_PCI_HOOK_pio(x)   x
> >> +#else
> >> +#define DEF_PCI_HOOK_pio(x)   NULL
> >> +#endif
> >
> > Maybe just put the entire definition block inside #ifdef and
> > fall back to the default inb/outb definitions otherwise.
> >
> >> +/*
> >> + * This value is equal to PCIBIOS_MIN_IO
> >> + */
> >> +#define LEGACY_ISA_PORT_MAX 0x1000
> >
> > I would just use PCIBIOS_MIN_IO instead of defining another macro.
> 
> Because PCIBIOS_MIN_IO is defined in asm/pci.h, and asm/io.h
> is included by asm/pci.h. so do you mean i define PCIBIOS_MIN_IO here,
> and in asm/pci.h just use include asm/io.h ?

Yes, I guess that would work.

	Arnd
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