zynqmp: caches: Enable dcache for zynqmp

Define the mmu table till 2MB granularity
enable dcaches for zynqmp.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

1 files changed, 164 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv8/zynqmp/cpu.c b/arch/arm/cpu/armv8/zynqmp/cpu.c
index 6fae03c..11958fe 100644
--- a/arch/arm/cpu/armv8/zynqmp/cpu.c
+++ b/arch/arm/cpu/armv8/zynqmp/cpu.c
@@ -26,3 +26,167 @@ unsigned int zynqmp_get_silicon_version(void)
 
 	return ZYNQMP_CSU_VERSION_EP108;
 }
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+#include <asm/armv8/mmu.h>
+
+#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 ZYNQMO_VA_BITS		40
+#define ZYNQMP_TCR		TCR_TG1_4K | \
+				TCR_EPD1_DISABLE | \
+				TCR_SHARED_OUTER | \
+				TCR_SHARED_INNER | \
+				TCR_IRGN_WBWA | \
+				TCR_ORGN_WBWA | \
+				TCR_T0SZ(ZYNQMO_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
+
+struct attr_tbl {
+	u32 num;
+	u64 attr;
+};
+
+static struct attr_tbl attr_tbll1t0[4] = { {16, 0x0},
+					   {8, DEVICE_ATTR},
+					   {32, MEMORY_ATTR},
+					   {456, DEVICE_ATTR}
+					 };
+static struct attr_tbl attr_tbll2t3[4] = { {0x180, DEVICE_ATTR},
+					   {0x40, 0x0},
+					   {0x3F, DEVICE_ATTR},
+					   {0x1, MEMORY_ATTR}
+					 };
+
+/*
+ * 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.
+ */
+static void zynqmp_mmu_setup(void)
+{
+	int el;
+	u32 index_attr;
+	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));
+
+	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;
+
+	index_attr = 0;
+	for (i = 0; i < 512; i++) {
+		level1_table_0[i] = section_l1t0;
+		level1_table_0[i] |= attr_tbll1t0[index_attr].attr;
+		attr_tbll1t0[index_attr].num--;
+		if (attr_tbll1t0[index_attr].num == 0)
+			index_attr++;
+		level1_table_1[i] = section_l1t1;
+		level1_table_1[i] |= DEVICE_ATTR;
+		section_l1t0 += BLOCK_SIZE_L1;
+		section_l1t1 += BLOCK_SIZE_L1;
+	}
+
+	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 */
+
+	index_attr = 0;
+
+	for (i = 0; i < 512; i++) {
+		level2_table_0[i] = section_l2t0 | MEMORY_ATTR;
+		level2_table_1[i] = section_l2t1 | MEMORY_ATTR;
+		level2_table_2[i] = section_l2t2 | DEVICE_ATTR;
+		level2_table_3[i] = section_l2t3 |
+				    attr_tbll2t3[index_attr].attr;
+		attr_tbll2t3[index_attr].num--;
+		if (attr_tbll2t3[index_attr].num == 0)
+			index_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,
+			  ZYNQMP_TCR, MEMORY_ATTRIBUTES);
+
+	set_sctlr(get_sctlr() | CR_M);
+}
+
+int arch_cpu_init(void)
+{
+	icache_enable();
+	__asm_invalidate_dcache_all();
+	__asm_invalidate_tlb_all();
+	return 0;
+}
+
+/*
+ * This function is called from lib/board.c.
+ * It recreates MMU table in main memory. MMU and d-cache are enabled earlier.
+ * There is no need to disable d-cache for this operation.
+ */
+void enable_caches(void)
+{
+	/* The data cache is not active unless the mmu is enabled */
+	if (!(get_sctlr() & CR_M)) {
+		invalidate_dcache_all();
+		__asm_invalidate_tlb_all();
+		zynqmp_mmu_setup();
+	}
+	puts("Enabling Caches...\n");
+
+	set_sctlr(get_sctlr() | CR_C);
+}
+#endif