[U-Boot] [PATCH v3 00/10] armv7: cache maintenance operations

[Aneesh V]

With D-cache and MMU enabled for ARM in u-boot it becomes imperative to
support a minimal set of cache maintenance operations and necessary
initializations before enabling MMU.

This series of patches attempt to do the following for armv7:
* Necessary initialization sequence before enabling MMU that includes
  invalidation of TLB, data caches, branch predictor array etc.
* Framework for supporting SOC specific outer caches in a generic manner
  (using a structure of function pointers - inspired by the Linux
  implementation)
* Generic armv7 cache maintenance operations for caches known to the CPU
* Support for ARM PL310 L2 cache controller used in OMAP4
* Cleanup of the cleanup_before_linux() function
* Adapting all armv7 SOCs to use the new framework and removing
  duplicated code

Testing:
* Extensive testing on OMAP4430SDP and OMAP3430SDP by creating coherency
  issues and solving them using the maintenance routines
	- Eg: memfill a region of memory with a known pattern
	- Invalidate the region
	- Read back and compare the region with the original pattern
	- If match fails it means that invalidate is successful
	- Now add a flush call just before the invalidate
	- If match succeeds it means that flush was successful
	- Outer caches were tested with experiments involving making the
	  function pointers NULL
* Kernel booting on OMAP4430SDP and OMAP3430SDP
Note: v2 has been tested only on OMAP4430SDP

V2:
* Pointer based callback mechanism for outer cache operations
  changed to a weakly linked functions.
* Change -march=armv7-a back to armv5
* Moved utility macros out of armv7.h
* Added documentation for new CONFIG options.
* Changed implementation of log2n to not use CLZ instruction as armv4
  doesn't support this instruction and newly added Tegra2 uses
  -march=armv4
* Blank line after local variable declarations - fixed globally
* Explicitly added an empty flush_cache() under
  #ifdef CONFIG_SYS_NO_DCACHE
* Removed the print inside the weakly linked stub function -
  __arm_init_before_mmu
* Fixed signature of flush_cache in cache.c
* More descriptive commit message for the PL310 support patch
* C struct for PL310 register accesses
* Fixed white space issues

V3:
* Rebased to latest HEAD of master
* Added comments on changes done in V2 in individual patch headers. This
  was missing in V2

Aneesh V (10):
  arm: make default implementation of cache_flush() weakly linked
  armv7: add miscellaneous utility macros
  armv7: cache maintenance operations for armv7
  armv7: replace CONFIG_L2_OFF with CONFIG_SYS_NO_L2CACHE
  armv7: integrate cache maintenance support
  arm: minor fixes for cache and mmu handling
  armv7: add PL310 support to u-boot
  armv7: adapt omap4 to the new cache maintenance framework
  armv7: adapt omap3 to the new cache maintenance framework
  armv7: adapt s5pc1xx to the new cache maintenance framework

 README                                        |   11 +
 arch/arm/cpu/armv7/Makefile                   |    2 +-
 arch/arm/cpu/armv7/cache_v7.c                 |  390 +++++++++++++++++++++++++
 arch/arm/cpu/armv7/cpu.c                      |   51 ++--
 arch/arm/cpu/armv7/omap3/Makefile             |    1 -
 arch/arm/cpu/armv7/omap3/board.c              |  138 ++++++++--
 arch/arm/cpu/armv7/omap3/cache.S              |  263 -----------------
 arch/arm/cpu/armv7/omap3/lowlevel_init.S      |   32 ++
 arch/arm/cpu/armv7/omap4/lowlevel_init.S      |   18 ++
 arch/arm/cpu/armv7/s5pc1xx/cache.S            |   88 +-----
 arch/arm/cpu/armv7/start.S                    |   18 +-
 arch/arm/include/asm/arch-omap3/omap3.h       |   20 ++
 arch/arm/include/asm/arch-omap3/sys_proto.h   |   10 +-
 arch/arm/include/asm/arch-omap4/sys_proto.h   |    1 -
 arch/arm/include/asm/arch-s5pc1xx/sys_proto.h |    3 -
 arch/arm/include/asm/armv7.h                  |   68 +++++
 arch/arm/include/asm/pl310.h                  |   74 +++++
 arch/arm/include/asm/utils.h                  |   80 +++++
 arch/arm/lib/Makefile                         |    1 +
 arch/arm/lib/board.c                          |    6 +
 arch/arm/lib/cache-cp15.c                     |   16 +-
 arch/arm/lib/cache-pl310.c                    |  116 ++++++++
 arch/arm/lib/cache.c                          |   20 +-
 include/common.h                              |    5 +-
 include/configs/ca9x4_ct_vxp.h                |    2 +-
 include/configs/efikamx.h                     |    2 +-
 include/configs/mx51evk.h                     |    2 +-
 include/configs/mx53evk.h                     |    2 +-
 include/configs/omap4_panda.h                 |    8 +-
 include/configs/omap4_sdp4430.h               |    8 +-
 include/configs/s5pc210_universal.h           |    2 +-
 include/configs/tegra2-common.h               |    2 +-
 include/configs/vision2.h                     |    2 +-
 33 files changed, 1037 insertions(+), 425 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/cache_v7.c
 delete mode 100644 arch/arm/cpu/armv7/omap3/cache.S
 create mode 100644 arch/arm/include/asm/armv7.h
 create mode 100644 arch/arm/include/asm/pl310.h
 create mode 100644 arch/arm/include/asm/utils.h
 create mode 100644 arch/arm/lib/cache-pl310.c