[U-Boot] [PATCH v3 06/11] tegra: Replace home grown mmu code with generic table approach

[Alexander Graf]

Now that we have nice table driven page table creating code that gives
us everything we need, move to that.

Signed-off-by: Alexander Graf <agraf at suse.de>

---

v1 -> v2:

  - Move mmu tables into .c file
---
 arch/arm/mach-tegra/arm64-mmu.c   | 132 +++++---------------------------------
 include/configs/tegra210-common.h |   2 +
 2 files changed, 19 insertions(+), 115 deletions(-)

diff --git a/arch/arm/mach-tegra/arm64-mmu.c b/arch/arm/mach-tegra/arm64-mmu.c
index c227652..501c4f0 100644
--- a/arch/arm/mach-tegra/arm64-mmu.c
+++ b/arch/arm/mach-tegra/arm64-mmu.c
@@ -12,120 +12,22 @@
 #include <asm/system.h>
 #include <asm/armv8/mmu.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
-#define SECTION_SHIFT_L1	30UL
-#define SECTION_SHIFT_L2	21UL
-#define BLOCK_SIZE_L0		0x8000000000UL
-#define BLOCK_SIZE_L1		(1 << SECTION_SHIFT_L1)
-#define BLOCK_SIZE_L2		(1 << SECTION_SHIFT_L2)
-
-#define TCR_TG1_4K		(1 << 31)
-#define TCR_EPD1_DISABLE	(1 << 23)
-#define TEGRA_VA_BITS		40
-#define TEGRA_TCR		TCR_TG1_4K | \
-				TCR_EPD1_DISABLE | \
-				TCR_SHARED_OUTER | \
-				TCR_SHARED_INNER | \
-				TCR_IRGN_WBWA | \
-				TCR_ORGN_WBWA | \
-				TCR_T0SZ(TEGRA_VA_BITS)
-
-#define MEMORY_ATTR	PMD_SECT_AF | PMD_SECT_INNER_SHARE |	\
-			PMD_ATTRINDX(MT_NORMAL) |	\
-			PMD_TYPE_SECT
-#define DEVICE_ATTR	PMD_SECT_AF | PMD_SECT_PXN |	\
-			PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_NGNRNE) |	\
-			PMD_TYPE_SECT
-
-/* 4K size is required to place 512 entries in each level */
-#define TLB_TABLE_SIZE	0x1000
-
-/*
- * This mmu table looks as below
- * Level 0 table contains two entries to 512GB sizes. One is Level1 Table 0
- * and other Level1 Table1.
- * Level1 Table0 contains entries for each 1GB from 0 to 511GB.
- * Level1 Table1 contains entries for each 1GB from 512GB to 1TB.
- * Level2 Table0, Level2 Table1, Level2 Table2 and Level2 Table3 contains
- * entries for each 2MB starting from 0GB, 1GB, 2GB and 3GB respectively.
- */
-void mmu_setup(void)
-{
-	int el;
-	u64 i, section_l1t0, section_l1t1;
-	u64 section_l2t0, section_l2t1, section_l2t2, section_l2t3;
-	u64 *level0_table = (u64 *)gd->arch.tlb_addr;
-	u64 *level1_table_0 = (u64 *)(gd->arch.tlb_addr + TLB_TABLE_SIZE);
-	u64 *level1_table_1 = (u64 *)(gd->arch.tlb_addr + (2 * TLB_TABLE_SIZE));
-	u64 *level2_table_0 = (u64 *)(gd->arch.tlb_addr + (3 * TLB_TABLE_SIZE));
-	u64 *level2_table_1 = (u64 *)(gd->arch.tlb_addr + (4 * TLB_TABLE_SIZE));
-	u64 *level2_table_2 = (u64 *)(gd->arch.tlb_addr + (5 * TLB_TABLE_SIZE));
-	u64 *level2_table_3 = (u64 *)(gd->arch.tlb_addr + (6 * TLB_TABLE_SIZE));
-
-	/* Invalidate all table entries */
-	memset(level0_table, 0, PGTABLE_SIZE);
-
-	level0_table[0] =
-		(u64)level1_table_0 | PMD_TYPE_TABLE;
-	level0_table[1] =
-		(u64)level1_table_1 | PMD_TYPE_TABLE;
-
-	/*
-	 * set level 1 table 0, covering 0 to 512GB
-	 * set level 1 table 1, covering 512GB to 1TB
-	 */
-	section_l1t0 = 0;
-	section_l1t1 = BLOCK_SIZE_L0;
-
-	for (i = 0; i < 512; i++) {
-		level1_table_0[i] = section_l1t0;
-		if (i >= 4)
-			level1_table_0[i] |= MEMORY_ATTR;
-		level1_table_1[i] = section_l1t1;
-		level1_table_1[i] |= MEMORY_ATTR;
-		section_l1t0 += BLOCK_SIZE_L1;
-		section_l1t1 += BLOCK_SIZE_L1;
+static struct mm_region tegra_mem_map[] = {
+	{
+		.base = 0x0UL,
+		.size = 0x80000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
+			 PTE_BLOCK_NON_SHARE |
+			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
+	}, {
+		.base = 0x80000000UL,
+		.size = 0xff80000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+			 PTE_BLOCK_INNER_SHARE
+	}, {
+		/* List terminator */
+		0,
 	}
+};
 
-	level1_table_0[0] =
-		(u64)level2_table_0 | PMD_TYPE_TABLE;
-	level1_table_0[1] =
-		(u64)level2_table_1 | PMD_TYPE_TABLE;
-	level1_table_0[2] =
-		(u64)level2_table_2 | PMD_TYPE_TABLE;
-	level1_table_0[3] =
-		(u64)level2_table_3 | PMD_TYPE_TABLE;
-
-	section_l2t0 = 0;
-	section_l2t1 = section_l2t0 + BLOCK_SIZE_L1; /* 1GB */
-	section_l2t2 = section_l2t1 + BLOCK_SIZE_L1; /* 2GB */
-	section_l2t3 = section_l2t2 + BLOCK_SIZE_L1; /* 3GB */
-
-	for (i = 0; i < 512; i++) {
-		level2_table_0[i] = section_l2t0 | DEVICE_ATTR;
-		level2_table_1[i] = section_l2t1 | DEVICE_ATTR;
-		level2_table_2[i] = section_l2t2 | MEMORY_ATTR;
-		level2_table_3[i] = section_l2t3 | MEMORY_ATTR;
-		section_l2t0 += BLOCK_SIZE_L2;
-		section_l2t1 += BLOCK_SIZE_L2;
-		section_l2t2 += BLOCK_SIZE_L2;
-		section_l2t3 += BLOCK_SIZE_L2;
-	}
-
-	/* flush new MMU table */
-	flush_dcache_range(gd->arch.tlb_addr,
-			   gd->arch.tlb_addr + gd->arch.tlb_size);
-
-	/* point TTBR to the new table */
-	el = current_el();
-	set_ttbr_tcr_mair(el, gd->arch.tlb_addr,
-			  TEGRA_TCR, MEMORY_ATTRIBUTES);
-
-	set_sctlr(get_sctlr() | CR_M);
-}
-
-u64 *arch_get_page_table(void)
-{
-	return (u64 *)(gd->arch.tlb_addr + (3 * TLB_TABLE_SIZE));
-}
+struct mm_region *mem_map = tegra_mem_map;
diff --git a/include/configs/tegra210-common.h b/include/configs/tegra210-common.h
index 8f35a7b..2a6e317 100644
--- a/include/configs/tegra210-common.h
+++ b/include/configs/tegra210-common.h
@@ -13,6 +13,8 @@
 /* Cortex-A57 uses a cache line size of 64 bytes */
 #define CONFIG_SYS_CACHELINE_SIZE	64
 
+#define CONFIG_SYS_FULL_VA
+
 /*
  * NS16550 Configuration
  */
-- 
1.8.5.6