Initial commit with upstream sources

Change-Id: Ie9460111f21fc955102fd8732a0173b2d0499a4a

1 files changed, 100 insertions, 0 deletions

diff --git a/core/drivers/cdns_uart.c b/core/drivers/cdns_uart.c
new file mode 100644
index 0000000..3b4e4b9
--- /dev/null
+++ b/core/drivers/cdns_uart.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2016, Xilinx Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 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.
+ */
+#include <compiler.h>
+#include <drivers/cdns_uart.h>
+#include <io.h>
+#include <util.h>
+
+#define CDNS_UART_CONTROL		0
+#define CDNS_UART_MODE			4
+#define CDNS_UART_IEN			8
+#define CDNS_UART_IRQ_STATUS		0x14
+#define CDNS_UART_CHANNEL_STATUS	0x2c
+#define CDNS_UART_FIFO			0x30
+
+#define CDNS_UART_CONTROL_RXRES		BIT(0)
+#define CDNS_UART_CONTROL_TXRES		BIT(1)
+#define CDNS_UART_CONTROL_RXEN		BIT(2)
+#define CDNS_UART_CONTROL_TXEN		BIT(4)
+
+#define CDNS_UART_MODE_8BIT		(0 << 1)
+#define CDNS_UART_MODE_PARITY_NONE	(0x4 << 3)
+#define CDNS_UART_MODE_1STP		(0 << 6)
+
+#define CDNS_UART_CHANNEL_STATUS_TFUL	BIT(4)
+#define CDNS_UART_CHANNEL_STATUS_TEMPTY	BIT(3)
+#define CDNS_UART_CHANNEL_STATUS_REMPTY	BIT(1)
+
+#define CDNS_UART_IRQ_RXTRIG		BIT(0)
+#define CDNS_UART_IRQ_RXTOUT		BIT(8)
+
+void cdns_uart_flush(vaddr_t base)
+{
+	while (!(read32(base + CDNS_UART_CHANNEL_STATUS) &
+				CDNS_UART_CHANNEL_STATUS_TEMPTY))
+		;
+}
+
+/*
+ * we rely on the bootloader having set up the HW correctly, we just enable
+ * transmitter/receiver here, just in case.
+ */
+void cdns_uart_init(vaddr_t base, uint32_t uart_clk, uint32_t baud_rate)
+{
+	if (!base || !uart_clk || !baud_rate)
+		return;
+
+	/* Enable UART and RX/TX */
+	write32(CDNS_UART_CONTROL_RXEN | CDNS_UART_CONTROL_TXEN,
+		base + CDNS_UART_CONTROL);
+
+	cdns_uart_flush(base);
+}
+
+void cdns_uart_putc(int ch, vaddr_t base)
+{
+	/* Wait until there is space in the FIFO */
+	while (read32(base + CDNS_UART_CHANNEL_STATUS) &
+			CDNS_UART_CHANNEL_STATUS_TFUL)
+		;
+
+	/* Send the character */
+	write32(ch, base + CDNS_UART_FIFO);
+}
+
+bool cdns_uart_have_rx_data(vaddr_t base)
+{
+	return !(read32(base + CDNS_UART_CHANNEL_STATUS) &
+			CDNS_UART_CHANNEL_STATUS_REMPTY);
+}
+
+int cdns_uart_getchar(vaddr_t base)
+{
+	while (!cdns_uart_have_rx_data(base))
+		;
+	return read32(base + CDNS_UART_FIFO) & 0xff;
+}