1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/arm/tzc/tzc380.c b/drivers/arm/tzc/tzc380.c
new file mode 100644
index 0000000..9518748
--- /dev/null
+++ b/drivers/arm/tzc/tzc380.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stddef.h>
+
+#include <common/debug.h>
+#include <drivers/arm/tzc380.h>
+#include <lib/mmio.h>
+
+struct tzc380_instance {
+	uintptr_t base;
+	uint8_t addr_width;
+	uint8_t num_regions;
+};
+
+struct tzc380_instance tzc380;
+
+static unsigned int tzc380_read_build_config(uintptr_t base)
+{
+	return mmio_read_32(base + TZC380_CONFIGURATION_OFF);
+}
+
+static void tzc380_write_action(uintptr_t base, unsigned int action)
+{
+	mmio_write_32(base + ACTION_OFF, action);
+}
+
+static void tzc380_write_region_base_low(uintptr_t base, unsigned int region,
+				      unsigned int val)
+{
+	mmio_write_32(base + REGION_SETUP_LOW_OFF(region), val);
+}
+
+static void tzc380_write_region_base_high(uintptr_t base, unsigned int region,
+				       unsigned int val)
+{
+	mmio_write_32(base + REGION_SETUP_HIGH_OFF(region), val);
+}
+
+static void tzc380_write_region_attributes(uintptr_t base, unsigned int region,
+					unsigned int val)
+{
+	mmio_write_32(base + REGION_ATTRIBUTES_OFF(region), val);
+}
+
+void tzc380_init(uintptr_t base)
+{
+	unsigned int tzc_build;
+
+	assert(base != 0U);
+	tzc380.base = base;
+
+	/* Save values we will use later. */
+	tzc_build = tzc380_read_build_config(tzc380.base);
+	tzc380.addr_width  = ((tzc_build >> BUILD_CONFIG_AW_SHIFT) &
+			      BUILD_CONFIG_AW_MASK) + 1;
+	tzc380.num_regions = ((tzc_build >> BUILD_CONFIG_NR_SHIFT) &
+			       BUILD_CONFIG_NR_MASK) + 1;
+}
+
+static uint32_t addr_low(uintptr_t addr)
+{
+	return (uint32_t)addr;
+}
+
+static uint32_t addr_high(uintptr_t addr __unused)
+{
+#if (UINTPTR_MAX == UINT64_MAX)
+	return addr >> 32;
+#else
+	return 0;
+#endif
+}
+
+/*
+ * `tzc380_configure_region` is used to program regions into the TrustZone
+ * controller.
+ */
+void tzc380_configure_region(uint8_t region, uintptr_t region_base, unsigned int attr)
+{
+	assert(tzc380.base != 0U);
+
+	assert(region < tzc380.num_regions);
+
+	tzc380_write_region_base_low(tzc380.base, region, addr_low(region_base));
+	tzc380_write_region_base_high(tzc380.base, region, addr_high(region_base));
+	tzc380_write_region_attributes(tzc380.base, region, attr);
+}
+
+void tzc380_set_action(unsigned int action)
+{
+	assert(tzc380.base != 0U);
+
+	/*
+	 * - Currently no handler is provided to trap an error via interrupt
+	 *   or exception.
+	 * - The interrupt action has not been tested.
+	 */
+	tzc380_write_action(tzc380.base, action);
+}