drivers: Add Cadence UART driver

Add a driver for the Cadence UART which is found in Xilinx Zynq SOCs.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/include/drivers/cadence/cdns_uart.h b/include/drivers/cadence/cdns_uart.h
new file mode 100644
index 00000000..bc1cc90f
--- /dev/null
+++ b/include/drivers/cadence/cdns_uart.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __CADENCE_UART_H__
+#define __CADENCE_UART_H__
+
+/* This is very minimalistic and will only work in QEMU.  */
+
+/* CADENCE Registers */
+#define R_UART_CR	0
+#define R_UART_CR_RXRST	(1 << 0) /* RX logic reset */
+#define R_UART_CR_TXRST	(1 << 1) /* TX logic reset */
+#define R_UART_CR_RX_EN	(1 << 2) /* RX enabled */
+#define R_UART_CR_TX_EN	(1 << 4) /* TX enabled */
+
+#define R_UART_SR		0x2C
+#define UART_SR_INTR_REMPTY_BIT	1
+#define UART_SR_INTR_TFUL_BIT	4
+
+#define R_UART_TX	0x30
+#define R_UART_RX	0x30
+
+#endif