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