Re: [PATCH 03/15] SPEAr13xx: Add mach/io.h

[viresh kumar <viresh.kumar@linaro.org>]

On Mon, Oct 29, 2012 at 12:31 PM, Pratyush Anand <pratyush.anand@st.com> wrote:
> In case of PCIe we need to have a different __io macro, which can write
> into PCIe address space.

You may find this interesting:

Do, git log --stat -p dd9bf78040fa0da4cecc228e1682b9682b8cb180

There is a series of commits like:

commit dd9bf78040fa0da4cecc228e1682b9682b8cb180
Author: Rob Herring <rob.herring@calxeda.com>
Date:   Wed Jul 4 11:18:40 2012 -0500

    ARM: iop3xx: use fixed PCI i/o mapping

    Move iop33x and iop32x PCI to fixed i/o mapping and remove io.h. This
    changes the PCI bus addresses from the cpu address to 0 based. It appears
    that there is translation h/w for this, but its untested.

    Not sure what to do with io_offset. I think it should always be 0.
    AFAICT, PCI setup is skipped if the ATU is already setup.

    Signed-off-by: Rob Herring <rob.herring@calxeda.com>
    Reviewed-by: Arnd Bergmann <arnd@arndb.de>

All mach/io.h are removed and you are adding one of those. :)

>
> Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
> ---
>  arch/arm/mach-spear13xx/include/mach/io.h |   35 +++++++++++++++++++++++++++++
>  1 files changed, 35 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-spear13xx/include/mach/io.h
>
> diff --git a/arch/arm/mach-spear13xx/include/mach/io.h b/arch/arm/mach-spear13xx/include/mach/io.h
> new file mode 100644
> index 0000000..a0d93ca
> --- /dev/null
> +++ b/arch/arm/mach-spear13xx/include/mach/io.h
> @@ -0,0 +1,35 @@
> +/*
> + * arch/arm/mach-spear13xx/include/mach/io.h
> + *
> + * spear13xx machine family generic header file

SPEAr

> + *
> + * Copyright (C) 2012 ST Microelectronics
> + * Pratyush Anand <pratyush.anand@st.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#ifndef __MACH_IO_H
> +#define __MACH_IO_H
> +
> +#define IO_SPACE_LIMIT 0xFFFF
> +
> +#ifdef CONFIG_SPEAR13XX_PCI
> +extern void __iomem *spear13xx_pcie_io_base(unsigned long addr);
> +
> +static inline void __iomem *__io(unsigned long addr)
> +{
> +       return spear13xx_pcie_io_base(addr) + (addr & IO_SPACE_LIMIT);
> +}
> +#else
> +static inline void __iomem *__io(unsigned long addr)
> +{
> +       return (void __iomem *)addr;
> +}
> +#endif
> +
> +#define __io(a)                __io(a)
> +
> +#endif /* __MACH_IO_H */
> --
> 1.7.5.4
>