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
Aneesh V (8): arm: make default implementation of cache_flush() weakly linked armv7: cache maintenance operations for armv7 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
arch/arm/cpu/armv7/Makefile | 2 +- arch/arm/cpu/armv7/cache_v7.c | 359 +++++++++++++++++++++++++ arch/arm/cpu/armv7/config.mk | 2 +- arch/arm/cpu/armv7/cpu.c | 47 ++-- arch/arm/cpu/armv7/omap3/Makefile | 1 - arch/arm/cpu/armv7/omap3/board.c | 151 +++++++++-- arch/arm/cpu/armv7/omap3/cache.S | 263 ------------------ arch/arm/cpu/armv7/omap3/lowlevel_init.S | 30 ++ arch/arm/cpu/armv7/omap4/board.c | 25 ++- arch/arm/cpu/armv7/omap4/lowlevel_init.S | 17 ++ arch/arm/cpu/armv7/s5pc1xx/cache.S | 86 +------ arch/arm/cpu/armv7/s5pc1xx/clock.c | 12 + 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/omap4.h | 6 + arch/arm/include/asm/arch-omap4/sys_proto.h | 3 +- arch/arm/include/asm/arch-s5pc1xx/sys_proto.h | 4 +- arch/arm/include/asm/armv7.h | 63 +++++ arch/arm/include/asm/pl310.h | 49 ++++ arch/arm/lib/Makefile | 1 + arch/arm/lib/board.c | 6 + arch/arm/lib/cache-cp15.c | 18 ++- arch/arm/lib/cache-pl310.c | 114 ++++++++ arch/arm/lib/cache.c | 20 +- include/common.h | 5 +- include/configs/omap4_panda.h | 6 +- include/configs/omap4_sdp4430.h | 6 +- 28 files changed, 929 insertions(+), 415 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/lib/cache-pl310.c