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| author | Akira Takeuchi <takeuchi.akr@jp.panasonic.com> | 2010-10-27 17:28:47 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2010-10-27 17:28:47 +0100 |
| commit | 633171861a3120af011bb1ee8dd40069951dfeac (patch) | |
| tree | f2b8fdd8108d4d7f2f3e948e64f882e18b7e2a35 /arch/mn10300 | |
| parent | 8be062892365b09f41d64cda7fa63d306e95e0c9 (diff) | |
| download | op-kernel-dev-633171861a3120af011bb1ee8dd40069951dfeac.zip op-kernel-dev-633171861a3120af011bb1ee8dd40069951dfeac.tar.gz | |
MN10300: Make the boot wrapper able to use writeback caching
Make the boot wrapper able to use writeback caching, including flushing the
cache before jumping to the main kernel.
Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300')
| -rw-r--r-- | arch/mn10300/boot/compressed/head.S | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/arch/mn10300/boot/compressed/head.S b/arch/mn10300/boot/compressed/head.S index 502e1eb..4ef608a 100644 --- a/arch/mn10300/boot/compressed/head.S +++ b/arch/mn10300/boot/compressed/head.S @@ -14,6 +14,7 @@ #include <linux/linkage.h> #include <asm/cpu-regs.h> +#include <asm/cache.h> .globl startup_32 startup_32: @@ -37,8 +38,15 @@ startup_32: mov (a0),d0 btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy lne - mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD,d0 # writethru dcache + +#ifdef CONFIG_MN10300_CACHE_ENABLED +#ifdef CONFIG_MN10300_CACHE_WBACK + mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0 +#else + mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0 +#endif /* WBACK */ movhu d0,(a0) # enable +#endif /* !ENABLED */ # clear the BSS area mov __bss_start,a0 @@ -54,6 +62,9 @@ bssclear_end: # decompress the kernel call decompress_kernel[],0 +#ifdef CONFIG_MN10300_CACHE_WBACK + call mn10300_dcache_flush_inv[],0 +#endif # disable caches again mov CHCTR,a0 @@ -69,10 +80,46 @@ bssclear_end: mov (4,a0),d1 mov (8,a0),d2 + # jump to the kernel proper entry point mov a3,sp mov CONFIG_KERNEL_TEXT_ADDRESS,a0 jmp (a0) + +############################################################################### +# +# Cache flush routines +# +############################################################################### +#ifdef CONFIG_MN10300_CACHE_WBACK +mn10300_dcache_flush_inv: + movhu (CHCTR),d0 + btst CHCTR_DCEN,d0 + beq mn10300_dcache_flush_inv_end + + mov L1_CACHE_NENTRIES,d1 + clr a1 + +mn10300_dcache_flush_inv_loop: + mov (DCACHE_PURGE_WAY0(0),a1),d0 # unconditional purge + mov (DCACHE_PURGE_WAY1(0),a1),d0 # unconditional purge + mov (DCACHE_PURGE_WAY2(0),a1),d0 # unconditional purge + mov (DCACHE_PURGE_WAY3(0),a1),d0 # unconditional purge + + add L1_CACHE_BYTES,a1 + add -1,d1 + bne mn10300_dcache_flush_inv_loop + +mn10300_dcache_flush_inv_end: + ret [],0 +#endif /* CONFIG_MN10300_CACHE_WBACK */ + + +############################################################################### +# +# Data areas +# +############################################################################### .data .align 4 param_save_area: |
