1 files changed, 39 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/mach-sunxi/dram_helpers.c b/roms/u-boot/arch/arm/mach-sunxi/dram_helpers.c
new file mode 100644
index 000000000..520b597fc
--- /dev/null
+++ b/roms/u-boot/arch/arm/mach-sunxi/dram_helpers.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRAM init helper functions
+ *
+ * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <common.h>
+#include <time.h>
+#include <asm/barriers.h>
+#include <asm/io.h>
+#include <asm/arch/dram.h>
+
+/*
+ * Wait up to 1s for value to be set in given part of reg.
+ */
+void mctl_await_completion(u32 *reg, u32 mask, u32 val)
+{
+	unsigned long tmo = timer_get_us() + 1000000;
+
+	while ((readl(reg) & mask) != val) {
+		if (timer_get_us() > tmo)
+			panic("Timeout initialising DRAM\n");
+	}
+}
+
+/*
+ * Test if memory at offset offset matches memory at begin of DRAM
+ */
+bool mctl_mem_matches(u32 offset)
+{
+	/* Try to write different values to RAM at two addresses */
+	writel(0, CONFIG_SYS_SDRAM_BASE);
+	writel(0xaa55aa55, (ulong)CONFIG_SYS_SDRAM_BASE + offset);
+	dsb();
+	/* Check if the same value is actually observed when reading back */
+	return readl(CONFIG_SYS_SDRAM_BASE) ==
+	       readl((ulong)CONFIG_SYS_SDRAM_BASE + offset);
+}