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authorJordan Crouse <jordan.crouse@amd.com>2008-03-19 23:56:58 +0000
committerJordan Crouse <jordan.crouse@amd.com>2008-03-19 23:56:58 +0000
commitf6145c3c15789123f6b4a9ce64a517048e753762 (patch)
tree0d56f31bd3f7051766c03f00d46f40511446aa96 /payloads/libpayload/drivers/serial.c
parentc221349746299537de9e01a0bcfb28485b15ef84 (diff)
libpayload: The initial chunk of code writen by AMD
This is the initial chunk of code written by me and copyrighted by AMD. Includes everything but a few files that we pulled from outside sources. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3170 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/drivers/serial.c')
-rw-r--r--payloads/libpayload/drivers/serial.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c
new file mode 100644
index 0000000000..bcf60df614
--- /dev/null
+++ b/payloads/libpayload/drivers/serial.c
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <libpayload.h>
+#include <sysinfo.h>
+
+#define IOBASE lib_sysinfo.ser_ioport
+
+#ifdef CONFIG_SERIAL_SET_SPEED
+#define DIVISOR (115200 / CONFIG_SERIAL_BAUD_RATE)
+#endif
+
+void serial_init(void)
+{
+#ifdef CONFIG_SERIAL_SET_SPEED
+ unsigned char reg;
+
+ /* Disable interrupts */
+ outb(0, IOBASE + 0x01);
+
+ /* Assert RTS and DTR */
+ outb(3, IOBASE + 0x04);
+
+ /* Set the divisor latch */
+ reg = inb(IOBASE + 0x03);
+ outb(reg | 0x80, IOBASE + 0x03);
+
+ /* Write the divisor */
+ outb(DIVISOR & 0xFF, IOBASE);
+ outb(DIVISOR >> 8 & 0xFF, IOBASE + 1);
+
+ /* Restore the previous value of the divisor */
+ outb(reg &= ~0x80, IOBASE + 0x03);
+#endif
+}
+
+void serial_putchar(unsigned char c)
+{
+ while((inb(IOBASE + 0x05) & 0x20) == 0);
+ outb(c, IOBASE);
+}
+
+int serial_havechar(void)
+{
+ return inb(IOBASE + 0x05) & 0x01;
+}
+
+int serial_getchar(void)
+{
+ while (!serial_havechar());
+ return (int) inb(IOBASE);
+}