sh: Isolate uncached mapping support.
This splits out the uncached mapping support under its own config option,
presently only used by 29-bit mode and 32-bit + PMB. This will make it
possible to optionally add an uncached mapping on sh64 as well as booting
without an uncached mapping for 32-bit.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index b890752..65cb5b8 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -75,6 +75,7 @@
config 29BIT
def_bool !32BIT
depends on SUPERH32
+ select UNCACHED_MAPPING
config 32BIT
bool
@@ -84,6 +85,7 @@
bool "Support 32-bit physical addressing through PMB"
depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP
select 32BIT
+ select UNCACHED_MAPPING
help
If you say Y here, physical addressing will be extended to
32-bits through the SH-4A PMB. If this is not set, legacy
@@ -173,6 +175,9 @@
def_bool y
depends on X2TLB || SUPERH64
+config UNCACHED_MAPPING
+ bool
+
choice
prompt "Kernel page size"
default PAGE_SIZE_4KB
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index dffa6c7..58012b6 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -21,11 +21,12 @@
#include <asm/cacheflush.h>
#include <asm/sections.h>
#include <asm/cache.h>
+#include <asm/sizes.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
-#ifdef CONFIG_SUPERH32
+#ifdef CONFIG_UNCACHED_MAPPING
/*
* This is the offset of the uncached section from its cached alias.
*
@@ -36,8 +37,8 @@
* Default value only valid in 29 bit mode, in 32bit mode this will be
* updated by the early PMB initialization code.
*/
-unsigned long cached_to_uncached = P2SEG - P1SEG;
-unsigned long uncached_size = 0x20000000;
+unsigned long cached_to_uncached = 0x20000000;
+unsigned long uncached_size = SZ_512M;
#endif
#ifdef CONFIG_MMU
@@ -281,7 +282,9 @@
#endif
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
+#ifdef CONFIG_UNCACHED_MAPPING
" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
+#endif
" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
@@ -299,9 +302,11 @@
(unsigned long)memory_start, (unsigned long)high_memory,
((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
+#ifdef CONFIG_UNCACHED_MAPPING
(unsigned long)memory_start + cached_to_uncached,
(unsigned long)memory_start + cached_to_uncached + uncached_size,
uncached_size >> 20,
+#endif
(unsigned long)&__init_begin, (unsigned long)&__init_end,
((unsigned long)&__init_end -
