arm64: core support

Relocation code based on a patch by Scott Wood, which is:
Signed-off-by: Scott Wood <scottwood@freescale.com>

Signed-off-by: David Feng <fenghua@phytium.com.cn>

1 files changed, 219 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
new file mode 100644
index 000000000..131fdaba3
--- /dev/null
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -0,0 +1,219 @@
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/system.h>
+#include <asm/armv8/mmu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+
+static void set_pgtable_section(u64 section, u64 memory_type)
+{
+	u64 *page_table = (u64 *)gd->arch.tlb_addr;
+	u64 value;
+
+	value = (section << SECTION_SHIFT) | PMD_TYPE_SECT | PMD_SECT_AF;
+	value |= PMD_ATTRINDX(memory_type);
+	page_table[section] = value;
+}
+
+/* to activate the MMU we need to set up virtual memory */
+static void mmu_setup(void)
+{
+	int i, j, el;
+	bd_t *bd = gd->bd;
+
+	/* Setup an identity-mapping for all spaces */
+	for (i = 0; i < (PGTABLE_SIZE >> 3); i++)
+		set_pgtable_section(i, MT_DEVICE_NGNRNE);
+
+	/* Setup an identity-mapping for all RAM space */
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		ulong start = bd->bi_dram[i].start;
+		ulong end = bd->bi_dram[i].start + bd->bi_dram[i].size;
+		for (j = start >> SECTION_SHIFT;
+		     j < end >> SECTION_SHIFT; j++) {
+			set_pgtable_section(j, MT_NORMAL);
+		}
+	}
+
+	/* load TTBR0 */
+	el = current_el();
+	if (el == 1)
+		asm volatile("msr ttbr0_el1, %0"
+			     : : "r" (gd->arch.tlb_addr) : "memory");
+	else if (el == 2)
+		asm volatile("msr ttbr0_el2, %0"
+			     : : "r" (gd->arch.tlb_addr) : "memory");
+	else
+		asm volatile("msr ttbr0_el3, %0"
+			     : : "r" (gd->arch.tlb_addr) : "memory");
+
+	/* enable the mmu */
+	set_sctlr(get_sctlr() | CR_M);
+}
+
+/*
+ * Performs a invalidation of the entire data cache at all levels
+ */
+void invalidate_dcache_all(void)
+{
+	__asm_flush_dcache_all();
+}
+
+/*
+ * Performs a clean & invalidation of the entire data cache at all levels
+ */
+void flush_dcache_all(void)
+{
+	__asm_flush_dcache_all();
+}
+
+/*
+ * Invalidates range in all levels of D-cache/unified cache
+ */
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	__asm_flush_dcache_range(start, stop);
+}
+
+/*
+ * Flush range(clean & invalidate) from all levels of D-cache/unified cache
+ */
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	__asm_flush_dcache_range(start, stop);
+}
+
+void dcache_enable(void)
+{
+	/* The data cache is not active unless the mmu is enabled */
+	if (!(get_sctlr() & CR_M)) {
+		invalidate_dcache_all();
+		__asm_invalidate_tlb_all();
+		mmu_setup();
+	}
+
+	set_sctlr(get_sctlr() | CR_C);
+}
+
+void dcache_disable(void)
+{
+	uint32_t sctlr;
+
+	sctlr = get_sctlr();
+
+	/* if cache isn't enabled no need to disable */
+	if (!(sctlr & CR_C))
+		return;
+
+	set_sctlr(sctlr & ~(CR_C|CR_M));
+
+	flush_dcache_all();
+	__asm_invalidate_tlb_all();
+}
+
+int dcache_status(void)
+{
+	return (get_sctlr() & CR_C) != 0;
+}
+
+#else	/* CONFIG_SYS_DCACHE_OFF */
+
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void dcache_enable(void)
+{
+}
+
+void dcache_disable(void)
+{
+}
+
+int dcache_status(void)
+{
+	return 0;
+}
+
+#endif	/* CONFIG_SYS_DCACHE_OFF */
+
+#ifndef CONFIG_SYS_ICACHE_OFF
+
+void icache_enable(void)
+{
+	set_sctlr(get_sctlr() | CR_I);
+}
+
+void icache_disable(void)
+{
+	set_sctlr(get_sctlr() & ~CR_I);
+}
+
+int icache_status(void)
+{
+	return (get_sctlr() & CR_I) != 0;
+}
+
+void invalidate_icache_all(void)
+{
+	__asm_invalidate_icache_all();
+}
+
+#else	/* CONFIG_SYS_ICACHE_OFF */
+
+void icache_enable(void)
+{
+}
+
+void icache_disable(void)
+{
+}
+
+int icache_status(void)
+{
+	return 0;
+}
+
+void invalidate_icache_all(void)
+{
+}
+
+#endif	/* CONFIG_SYS_ICACHE_OFF */
+
+/*
+ * Enable dCache & iCache, whether cache is actually enabled
+ * depend on CONFIG_SYS_DCACHE_OFF and CONFIG_SYS_ICACHE_OFF
+ */
+void enable_caches(void)
+{
+	icache_enable();
+	dcache_enable();
+}
+
+/*
+ * Flush range from all levels of d-cache/unified-cache
+ */
+void flush_cache(unsigned long start, unsigned long size)
+{
+	flush_dcache_range(start, start + size);
+}