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
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