Add PL011 UART driver
A minimal PL011 driver containing necessary functions
to print to UART. Based on the assembly implementation
found in TF-A (hash: 39bcbeac9c8c20ae660cb6d9e825ceb01e6144e7;
file: drivers/arm/pl011/aarch64/pl011_console.S).
Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Signed-off-by: Gabor Ambrus <gabor.ambrus@arm.com>
Change-Id: I644fb011b2b9a68aa09e8cc3a09ebd8b9576bb30
diff --git a/platform/drivers/common/mmio.h b/platform/drivers/common/mmio.h
new file mode 100644
index 0000000..edb7720
--- /dev/null
+++ b/platform/drivers/common/mmio.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copied from trustedfirmware-a and stripped down.
+ */
+
+#ifndef MMIO_H
+#define MMIO_H
+
+#include <stdint.h>
+
+static inline void mmio_write_32(uintptr_t addr, uint32_t value)
+{
+ *(volatile uint32_t *)addr = value;
+}
+
+static inline uint32_t mmio_read_32(uintptr_t addr)
+{
+ return *(volatile uint32_t *)addr;
+}
+
+#endif /* MMIO_H */