[PATCH v2 19/25] powerpc/8xx: rewrite flush_instruction_cache() in C
From: Christophe Leroy <hidden>
Date: 2015-09-22 16:51:13
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
On PPC8xx, flushing instruction cache is performed by writing in register SPRN_IC_CST. This registers suffers CPU6 ERRATA. The patch rewrites the fonction in C so that CPU6 ERRATA will be handled transparently Signed-off-by: Christophe Leroy <redacted> --- No change in v2 arch/powerpc/kernel/misc_32.S | 10 ++++------ arch/powerpc/mm/8xx_mmu.c | 7 +++++++ 2 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index ed3ab50..72fd7a7 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S@@ -296,12 +296,9 @@ _GLOBAL(real_writeb) * Flush instruction cache. * This is a no-op on the 601. */ +#ifndef CONFIG_PPC_8xx _GLOBAL(flush_instruction_cache) -#if defined(CONFIG_8xx) - isync - lis r5, IDC_INVALL@h - mtspr SPRN_IC_CST, r5 -#elif defined(CONFIG_4xx) +#if defined(CONFIG_4xx) #ifdef CONFIG_403GCX li r3, 512 mtctr r3
@@ -334,9 +331,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE) mfspr r3,SPRN_HID0 ori r3,r3,HID0_ICFI mtspr SPRN_HID0,r3 -#endif /* CONFIG_8xx/4xx */ +#endif /* CONFIG_4xx */ isync blr +#endif /* CONFIG_PPC_8xx */ /* * Write any modified data cache blocks out to memory
diff --git a/arch/powerpc/mm/8xx_mmu.c b/arch/powerpc/mm/8xx_mmu.c
index 09e5d08..08a489c 100644
--- a/arch/powerpc/mm/8xx_mmu.c
+++ b/arch/powerpc/mm/8xx_mmu.c@@ -182,3 +182,10 @@ void set_context(unsigned long id, pgd_t *pgd) /* sync */ mb(); } + +void flush_instruction_cache(void) +{ + isync(); + mtspr(SPRN_IC_CST, IDC_INVALL); + isync(); +}
--
2.1.0