This is a rework of patch 4-6 in the first "cfi_flash cleanup" series based on feedback from the u-boot mailing list.
Changes: * Use __raw I/O accessors instead of volatile casts, except in the 64-bit case (no arches currently have 64-bit I/O accessors.) * Add "size" and "flags" parameters to map_physmem() and use them. * Add "size" parameter to unmap_physmem() and use it.
I've added four possible flags that may be given to map_physmem() to specify caching properties:
MAP_NOCACHE: Don't cache anything at all MAP_WRCOMBINE: Buffering writes to the same cache line is allowed MAP_WRTHROUGH: Write-through caching is allowed MAP_WRBACK: Write-back caching is allowed
Platforms are allowed to substitute a flag with another higher up on the list. For example, if write-through caching is requested, the platform is allowed to turn off caching altogether, but it is not allowed to use write-back caching.
The flags currently only have any meaning on avr32, but I hope other architectures will do something useful with them as well eventually.
Haavard Skinnemoen (4): Implement __raw_{read,write}[bwl] on all architectures cfi_flash: Introduce read and write accessors Introduce map_physmem() and unmap_physmem() cfi_flash: Use map_physmem() and unmap_physmem()
drivers/mtd/cfi_flash.c | 354 +++++++++++++++++++++++++++---------------- include/asm-arm/io.h | 26 +++ include/asm-avr32/io.h | 32 ++++ include/asm-blackfin/io.h | 26 +++ include/asm-i386/io.h | 26 +++ include/asm-m68k/io.h | 41 +++++ include/asm-microblaze/io.h | 26 +++ include/asm-mips/io.h | 26 +++ include/asm-nios/io.h | 34 ++++ include/asm-nios2/io.h | 34 ++++ include/asm-ppc/io.h | 58 +++++++- 11 files changed, 554 insertions(+), 129 deletions(-)