Hi Simon,
On Mon, Mar 7, 2016 at 10:28 AM, Simon Glass sjg@chromium.org wrote:
The clrsetbits_...() macros are useful for working with memory mapped I/O. But they do not work with I/O space, as used on x86 machines.
Add some macros to provide similar features for I/O.
Signed-off-by: Simon Glass sjg@chromium.org
arch/x86/include/asm/io.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index e0b2561..38b543d 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -254,6 +254,28 @@ __OUTS(b) __OUTS(w) __OUTS(l)
+/* IO space accessors */ +#define clrio(type, addr, clear) \
out##type(in##type(addr) & ~(clear), (addr))+#define setio(type, addr, set) \
out##type(in##type(addr) | (set), (addr))+#define clrsetio(type, addr, clear, set) \
out##type((in##type(addr) & ~(clear)) | (set), (addr))+#define clrio_le32(addr, clear) clrio(l, addr, clear) +#define clrio_le16(addr, clear) clrio(w, addr, clear) +#define clrio_8(addr, clear) clrio(b, addr, clear)
+#define setio_le32(addr, set) setio(l, addr, set) +#define setio_le16(addr, set) setio(w, addr, set) +#define setio_8(addr, set) setio(b, addr, set)
+#define clrsetio_le32(addr, clear, set) clrsetio(l, addr, clear, set) +#define clrsetio_le16(addr, clear, set) clrsetio(w, addr, clear, set) +#define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
Why adding _leXX to these ops? x86 is always little-endian, and we won't bother creating a _beXX version.
static inline void sync(void) { } --
Regards, Bin