summaryrefslogtreecommitdiff
path: root/core/drivers/ns16550.c
diff options
context:
space:
mode:
authorr.tyminski <r.tyminski@partner.samsung.com>2017-05-29 09:42:10 (GMT)
committerr.tyminski <r.tyminski@partner.samsung.com>2017-05-29 09:49:50 (GMT)
commitf9a43781767007462965b21f3f518c4cfc0744c7 (patch)
tree201509439b1d9798256227794dae6774345adf43 /core/drivers/ns16550.c
parent1fed20f5471aa0dad5e4b4f79d1f2843ac88734f (diff)
downloadtef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.zip
tef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.tar.gz
tef-optee_os-f9a43781767007462965b21f3f518c4cfc0744c7.tar.bz2
Initial commit with upstream sourcesrefs/changes/71/131471/1
Change-Id: Ie9460111f21fc955102fd8732a0173b2d0499a4a
Diffstat (limited to 'core/drivers/ns16550.c')
-rw-r--r--core/drivers/ns16550.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/core/drivers/ns16550.c b/core/drivers/ns16550.c
new file mode 100644
index 0000000..710b351
--- /dev/null
+++ b/core/drivers/ns16550.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2015 Freescale Semiconductor, 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 <drivers/ns16550.h>
+#include <io.h>
+
+/* uart register defines */
+#define UART_RBR 0x0
+#define UART_THR 0x0
+#define UART_IER 0x1
+#define UART_FCR 0x2
+#define UART_LCR 0x3
+#define UART_MCR 0x4
+#define UART_LSR 0x5
+#define UART_MSR 0x6
+#define UART_SPR 0x7
+
+/* uart status register bits */
+#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
+
+void ns16550_flush(vaddr_t base)
+{
+ while ((read8(base + UART_LSR) & UART_LSR_THRE) == 0)
+ ;
+}
+
+void ns16550_putc(int ch, vaddr_t base)
+{
+ ns16550_flush(base);
+
+ /* write out charset to Transmit-hold-register */
+ write8(ch, base + UART_THR);
+}