arm64: make mmu_enable() use previous ttb from mmu_init()

No need to pass in the same value for the ttb after just
calling mmu_init(). All current users are setting this once
and forgetting it.

BUG=chrome-os-partner:31545
BRANCH=None
TEST=Built and booted on ryu.

Change-Id: I54c7e4892d44ea6129429d8a46461d089dd8e2a9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/214772
Reviewed-by: Furquan Shaikh <furquan@chromium.org>

src/arch/arm64/armv8/mmu.c

@@ -285,7 +285,7 @@ static uint32_t is_mmu_enabled(void)
 	return (sctlr & SCTLR_M);
 }
 
-void mmu_enable(uint64_t ttbr)
+void mmu_enable(void)
 {
 	uint32_t sctlr;
 
@@ -301,7 +301,7 @@ void mmu_enable(uint64_t ttbr)
 			  TCR_TBI_USED);
 
 	/* Initialize TTBR */
-	raw_write_ttbr0_el3(ttbr);
+	raw_write_ttbr0_el3((uintptr_t)xlat_addr);
 
 	/* Ensure all translation table writes are committed before enabling MMU */
 	dsb();

src/arch/arm64/include/armv8/arch/mmu.h

@@ -162,7 +162,9 @@
 #define TCR_TBI_USED               (0x0 << TCR_TBI_SHIFT)
 #define TCR_TBI_IGNORED            (0x1 << TCR_TBI_SHIFT)
 
-void mmu_init(struct memranges *,uint64_t *,uint64_t);
-void mmu_enable(uint64_t);
+/* Initialize the MMU TTB tables provide the range sequence and ttb buffer. */
+void mmu_init(struct memranges *ranges, uint64_t *ttb, uint64_t ttb_size);
+/* Enable the mmu based on previous mmu_init(). */
+void mmu_enable(void);
 
 #endif // __ARCH_ARM64_MMU_H__

src/soc/nvidia/tegra132/mmu_operations.c

@@ -95,5 +95,5 @@ void tegra132_mmu_init(void)
 	tz_base_mib *= MiB;
 	ttb_size_mib = TTB_SIZE * MiB;
 	mmu_init(map, (void *)tz_base_mib, ttb_size_mib);
-	mmu_enable(tz_base_mib);
+	mmu_enable();
 }