On Mon, Oct 29, 2012 at 12:31 PM, Pratyush Anand [off-list ref] 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 [off-list ref]
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 [off-list ref]
    Reviewed-by: Arnd Bergmann [off-list ref]

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

SPEAr

+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Pratyush Anand [off-list ref]
+ *
+ * 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