armv7: add new dcache and MMU setup functions

This adds new MMU setup code. Most notably, this version uses
cbmem_add() to determine the translation table base address, which
in turn is necessary to ensure payloads which wipe memory can tell
which regions to wipe out.

TODOs:
- Finish cleaning up references to old cache/MMU stuff
- Add L2 setup (from exynos_cache.c)
- Set up ranges dynamically rather than in ramstage's main().

Change-Id: Iba5295a801e8058a3694e4ec5b94bbe9a69d3ee6
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2877
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/armv7/lib/cache.c

@@ -204,6 +204,28 @@ void dcache_clean_invalidate_by_mva(unsigned long addr, unsigned long len)
 	dcache_op_mva(addr, len, OP_DCCIMVAC);
 }
 
+
+void dcache_mmu_disable(void)
+{
+	uint32_t sctlr;
+
+	sctlr = read_sctlr();
+	dcache_clean_invalidate_all();
+	sctlr &= ~(SCTLR_C | SCTLR_M);
+	write_sctlr(sctlr);
+}
+
+
+void dcache_mmu_enable(void)
+{
+	uint32_t sctlr;
+
+	sctlr = read_sctlr();
+	dcache_clean_invalidate_all();
+	sctlr |= SCTLR_C | SCTLR_M;
+	write_sctlr(sctlr);
+}
+
 void armv7_invalidate_caches(void)
 {
 	uint32_t clidr;
@@ -252,10 +274,3 @@ void armv7_invalidate_caches(void)
 	/* Invalidate TLB */
 	tlb_invalidate_all();
 }
-
-/* FIXME: wrapper around imported mmu_setup() for now */
-extern void mmu_setup(unsigned long start, unsigned long size);
-void mmu_setup_by_mva(unsigned long start, unsigned long size)
-{
-	mmu_setup(start, size);
-}