diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2007-07-31 17:07:28 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2007-09-21 11:57:46 +0900 |
| commit | e7bd34a15b85655f24d1b45edbe3bdfebf9d027e (patch) | |
| tree | 051647273266582fe95dcc5cf008534c264be5ae /arch/sh/kernel | |
| parent | ac919986d7dfc5d1d9f5585521307f222a8ebeaf (diff) | |
sh: Support explicit L1 cache disabling.
This reworks the cache mode configuration in Kconfig, and allows for
explicit selection of write-back/write-through/off configurations.
All of the cache flushing routines are optimized away for the off
case.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | arch/sh/kernel/cpu/init.c | 11 | ||||
| -rw-r--r-- | arch/sh/kernel/sh_ksyms.c | 7 |
2 files changed, 11 insertions, 7 deletions
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c index 9172e97dc26..fdc245b7b04 100644 --- a/arch/sh/kernel/cpu/init.c +++ b/arch/sh/kernel/cpu/init.c @@ -143,12 +143,15 @@ static void __init cache_init(void) flags &= ~CCR_CACHE_EMODE; #endif -#ifdef CONFIG_SH_WRITETHROUGH - /* Turn on Write-through caching */ +#if defined(CONFIG_CACHE_WRITETHROUGH) + /* Write-through */ flags |= CCR_CACHE_WT; -#else - /* .. or default to Write-back */ +#elif defined(CONFIG_CACHE_WRITEBACK) + /* Write-back */ flags |= CCR_CACHE_CB; +#else + /* Off */ + flags &= ~CCR_CACHE_ENABLE; #endif ctrl_outl(flags, CCR); diff --git a/arch/sh/kernel/sh_ksyms.c b/arch/sh/kernel/sh_ksyms.c index 37aef0a8519..de250705c35 100644 --- a/arch/sh/kernel/sh_ksyms.c +++ b/arch/sh/kernel/sh_ksyms.c @@ -128,7 +128,8 @@ DECLARE_EXPORT(__movstrSI12_i4); #endif /* __GNUC__ == 4 */ #endif -#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) +#if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \ + defined(CONFIG_SH7705_CACHE_32KB)) /* needed by some modules */ EXPORT_SYMBOL(flush_cache_all); EXPORT_SYMBOL(flush_cache_range); @@ -136,8 +137,8 @@ EXPORT_SYMBOL(flush_dcache_page); EXPORT_SYMBOL(__flush_purge_region); #endif -#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \ - defined(CONFIG_SH7705_CACHE_32KB)) +#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \ + (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)) EXPORT_SYMBOL(clear_user_page); #endif |