1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/arm/scu/scu.c b/drivers/arm/scu/scu.c
new file mode 100644
index 0000000..aceac92
--- /dev/null
+++ b/drivers/arm/scu/scu.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <drivers/arm/scu.h>
+#include <lib/mmio.h>
+#include <plat/common/platform.h>
+#include <stdint.h>
+
+/*******************************************************************************
+ * Turn ON snoop control unit. This is needed to synchronize the data between
+ * CPU's.
+ ******************************************************************************/
+void enable_snoop_ctrl_unit(uintptr_t base)
+{
+	uint32_t scu_ctrl;
+
+	INFO("[SCU]: enabling snoop control unit ... \n");
+
+	assert(base != 0U);
+	scu_ctrl = mmio_read_32(base + SCU_CTRL_REG);
+
+	/* already enabled? */
+	if ((scu_ctrl & SCU_ENABLE_BIT) != 0) {
+		return;
+	}
+
+	scu_ctrl |= SCU_ENABLE_BIT;
+	mmio_write_32(base + SCU_CTRL_REG, scu_ctrl);
+}
+
+/*******************************************************************************
+ * Snoop Control Unit configuration register. This is read-only register and
+ * contains information such as
+ * - number of CPUs present
+ * - is a particular CPU operating in SMP mode or AMP mode
+ * - data cache size of a particular CPU
+ * - does SCU has ACP port
+ * - is L2CPRESENT
+ * NOTE: user of this API should interpert the bits in this register according
+ * to the TRM
+ ******************************************************************************/
+uint32_t read_snoop_ctrl_unit_cfg(uintptr_t base)
+{
+	assert(base != 0U);
+
+	return mmio_read_32(base + SCU_CFG_REG);
+}