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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-03-22 15:07:32 (GMT) |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-03-23 15:15:58 (GMT) |
| commit | a509161a21ef7584d614dc1530a2756dcfb217e0 (patch) | |
| tree | 01a59554b7e9281d97896ccb0e4a766bbd88d8c6 /arch | |
| parent | 62118b7b0183d29755a101a6a5b88dee11c5f94b (diff) | |
| download | u-boot-a509161a21ef7584d614dc1530a2756dcfb217e0.tar.xz | |
ARM: UniPhier: disable L2 cache by lowlevel_init of U-Boot proper
The L2 cache is used as a temporary SRAM on SPL.
Now the secondary CPUs store the necessary code for jumping to
Linux on their L1 I-caches. So, the L2 cache can be disabled
much earlier, at the very entry of U-Boot proper (lowlevel_init).
This makes the boot sequence clearer.
Also, as the L1 cache has been disabled by the start.S,
enable_caches() does not need to do it again.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-uniphier/cache_uniphier.c | 17 | ||||
| -rw-r--r-- | arch/arm/mach-uniphier/late_lowlevel_init.S | 5 |
2 files changed, 5 insertions, 17 deletions
diff --git a/arch/arm/mach-uniphier/cache_uniphier.c b/arch/arm/mach-uniphier/cache_uniphier.c index 4bf01bc..c1e9164 100644 --- a/arch/arm/mach-uniphier/cache_uniphier.c +++ b/arch/arm/mach-uniphier/cache_uniphier.c @@ -122,23 +122,6 @@ void v7_outer_cache_disable(void) void enable_caches(void) { - uint32_t reg; - - /* - * UniPhier SoCs must use L2 cache for init stack pointer. - * We disable L2 and L1 in this order. - * If CONFIG_SYS_DCACHE_OFF is not defined, - * caches are enabled again with a new page table. - */ - - /* L2 disable */ - v7_outer_cache_disable(); - - /* L1 disable */ - reg = get_cr(); - reg &= ~(CR_C | CR_M); - set_cr(reg); - #ifndef CONFIG_SYS_DCACHE_OFF dcache_enable(); #endif diff --git a/arch/arm/mach-uniphier/late_lowlevel_init.S b/arch/arm/mach-uniphier/late_lowlevel_init.S index 22be2a2..1363364 100644 --- a/arch/arm/mach-uniphier/late_lowlevel_init.S +++ b/arch/arm/mach-uniphier/late_lowlevel_init.S @@ -6,7 +6,12 @@ */ #include <linux/linkage.h> +#include <mach/ssc-regs.h> ENTRY(lowlevel_init) + ldr r1, = SSCC + ldr r0, [r1] + bic r0, r0, #SSCC_ON @ L2 disable + str r0, [r1] mov pc, lr ENDPROC(lowlevel_init) |