[U-Boot] [PATCH v2 00/11] Define ARCH_DMA_MINALIGN for all architectures

[Anton Staaf]

ARCH_DMA_MINALIGN is a new define borrowed from the Linux kernel.  It is
used to define the minimum alignement requirement for a DMA buffer.  This
series of patches ensures that it will always be defined in the arch specific
asm/cache.h header and that asm/cache.h is included in common.h.  I chose to
add this new define instead of reusing CONFIG_SYS_CACHELINE_SIZE for two
reasons.  First, CONFIG_SYS_CACHELINE_SIZE is not defined for all architectures
and thus to use it I would have to first define it correctly for all used
architectures.  I wasn't quite up to that task right now.  Defining
ARCH_DMA_MINALIGN is easier because it has slightly different semantics that
allow it to be the maximum cacheline size known for an architecture.  And
secondly, CONFIG_SYS_CACHELINE_SIZE may not always be the correct value to use
to align DMA buffers.  In particular, on cache coherent architectures you can
define ARCH_DMA_MINALIGN as 1 and be safe (unless there are other restrictions
such as PCI alignment requirements).

This patch set will allow me to resubmit my ALLOC_CACHE_ALIGN_BUFFER patch set
modified to use this new define in place of CONFIG_SYS_CACHELINE_SIZE.  I will
repost those patches based on this set shortly.

Since we've heard no complaints and have an ack for PowerPC at least, I think
this can go in as is.  It's defining a new macro that isn't used yet and I
believe that each architecture has a reasonable value defined now.

Thanks,
    Anton

Changes in v2:
- Remove blackfin patches in favor of Mike's import of the Linux kernel cache.h
- Remove all Gerrit Change-ID tags

Anton Staaf (11):
  arm: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  m68k: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  nios2: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  powerpc: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  sh: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  sparc: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  avr32: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  microblaze: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  mips: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  x86: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
  cache: include asm/cache.h for ARCH_DMA_MINALIGN definition

 arch/arm/include/asm/cache.h        |   11 +++++++++
 arch/avr32/include/asm/cache.h      |   40 +++++++++++++++++++++++++++++++++++
 arch/m68k/include/asm/cache.h       |   10 ++++++++
 arch/microblaze/include/asm/cache.h |   37 ++++++++++++++++++++++++++++++++
 arch/mips/include/asm/cache.h       |   36 +++++++++++++++++++++++++++++++
 arch/nios2/include/asm/cache.h      |   11 +++++++++
 arch/powerpc/include/asm/cache.h    |    6 +++++
 arch/sh/include/asm/cache.h         |   17 ++++++++++++++
 arch/sparc/include/asm/cache.h      |   10 ++++++++
 arch/x86/include/asm/cache.h        |   35 ++++++++++++++++++++++++++++++
 include/common.h                    |    8 +++++++
 11 files changed, 221 insertions(+), 0 deletions(-)
 create mode 100644 arch/avr32/include/asm/cache.h
 create mode 100644 arch/microblaze/include/asm/cache.h
 create mode 100644 arch/mips/include/asm/cache.h
 create mode 100644 arch/x86/include/asm/cache.h

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1.7.3.1