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| author | Max Filippov <jcmvbkbc@gmail.com> | 2014-10-04 18:50:53 +0400 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2014-10-21 13:28:56 +0400 |
| commit | 2eabc1800d1ef7a850672aedcc266a831572af63 (patch) | |
| tree | 06e4c80168c5c9611f0c548954f93c8d7b135f11 | |
| parent | 53490121e9ffa3e6314137af016cde8ac83c9bb4 (diff) | |
| download | linux-2eabc1800d1ef7a850672aedcc266a831572af63.tar.xz | |
xtensa: nommu: set up cache and atomctl in initialize_mmu
initialize_mmu sets up atomctl SR which is needed for s32c1i to function
correctly even in noMMU configurations. It's also a good place to set up
caching attributes of physical memory.
Allow enabling INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX in noMMU
configurations for setting up atomctl and cache attributes.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| -rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/initialize_mmu.h | 37 |
2 files changed, 36 insertions, 2 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 81f57e8c8f1b..cb44f6f95968 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -191,7 +191,6 @@ config HOTPLUG_CPU config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX bool "Initialize Xtensa MMU inside the Linux kernel code" - depends on MMU default y help Earlier version initialized the MMU in the exception vector diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h index cdac5584ec0c..e256f2270ec9 100644 --- a/arch/xtensa/include/asm/initialize_mmu.h +++ b/arch/xtensa/include/asm/initialize_mmu.h @@ -26,8 +26,16 @@ #include <asm/pgtable.h> #include <asm/vectors.h> +#if XCHAL_HAVE_PTP_MMU #define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC) #define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC) +#else +#define CA_WRITEBACK (0x4) +#endif + +#ifndef XCHAL_SPANNING_WAY +#define XCHAL_SPANNING_WAY 0 +#endif #ifdef __ASSEMBLY__ @@ -75,7 +83,7 @@ /* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */ - movi a2, 0x40000006 + movi a2, 0x40000000 | XCHAL_SPANNING_WAY idtlb a2 iitlb a2 isync @@ -153,6 +161,33 @@ #endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY */ +#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS + /* Enable data and instruction cache in the DEFAULT_MEMORY region + * if the processor has DTLB and ITLB. + */ + + movi a5, PLATFORM_DEFAULT_MEM_START | XCHAL_SPANNING_WAY + movi a6, ~_PAGE_ATTRIB_MASK + movi a7, CA_WRITEBACK + movi a8, 0x20000000 + movi a9, PLATFORM_DEFAULT_MEM_SIZE + j 2f +1: + sub a9, a9, a8 +2: + rdtlb1 a3, a5 + ritlb1 a4, a5 + and a3, a3, a6 + and a4, a4, a6 + or a3, a3, a7 + or a4, a4, a7 + wdtlb a3, a5 + witlb a4, a5 + add a5, a5, a8 + bltu a8, a9, 1b + +#endif + .endm #endif /*__ASSEMBLY__*/ |