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authorUwe Hermann <uwe@hermann-uwe.de>2008-03-31 15:18:56 +0000
committerUwe Hermann <uwe@hermann-uwe.de>2008-03-31 15:18:56 +0000
commitb642e6d40a4347a5963e1f469ec863140b0cae59 (patch)
tree66bc79aeea0eda17bacb3d60affd8046c329fd25 /payloads/libpayload/drivers/nvram.c
parentc16d24e73a52858fa165371fa339a37c1adac403 (diff)
downloadcoreboot-b642e6d40a4347a5963e1f469ec863140b0cae59.tar.xz
Rename drivers/cmos.c to drivers/nvram.c (trivial).
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3200 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/drivers/nvram.c')
-rw-r--r--payloads/libpayload/drivers/nvram.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/nvram.c b/payloads/libpayload/drivers/nvram.c
new file mode 100644
index 0000000000..3789c09b3c
--- /dev/null
+++ b/payloads/libpayload/drivers/nvram.c
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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.
+ */
+
+/*
+ * Datasheet:
+ * - Name: MC146818: Real-time Clock Plus RAM (RTC)
+ * - PDF: http://www.freescale.com/files/microcontrollers/doc/data_sheet/MC146818.pdf
+ * - Order number: MC146818/D
+ */
+
+/*
+ * See also:
+ * http://bochs.sourceforge.net/techspec/CMOS-reference.txt
+ * http://www.bioscentral.com/misc/cmosmap.htm
+ */
+
+#include <libpayload.h>
+
+#define RTC_PORT 0x70
+
+/**
+ * Read a byte from the specified NVRAM address.
+ *
+ * @param addr The NVRAM address to read a byte from.
+ * @return The byte at the given NVRAM address.
+ */
+u8 nvram_read(u8 addr)
+{
+ outb(addr, RTC_PORT);
+ return inb(RTC_PORT + 1);
+}
+
+/**
+ * Write a byte to the specified NVRAM address.
+ *
+ * @param val The byte to write to NVRAM.
+ * @param addr The NVRAM address to write to.
+ */
+void nvram_write(u8 val, u8 addr)
+{
+ outb(addr, RTC_PORT);
+ outb(val, RTC_PORT + 1);
+}