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authorStefan Reinauer <stepan@coresystems.de>2009-11-05 12:38:34 +0000
committerStefan Reinauer <stepan@openbios.org>2009-11-05 12:38:34 +0000
commit67fed69653a684355edd9c7a13fba24e4f0fdd1a (patch)
tree70674ebd4779692189b45834e983afac177444bb /src
parente6ad7fa4a6a8456ed229b4797addb97ceb35d7cc (diff)
downloadcoreboot-67fed69653a684355edd9c7a13fba24e4f0fdd1a.tar.xz
http://www.coreboot.org/pipermail/coreboot/2007-October/025740.html
This function is not called right now,... Please step in and fix up your code, folks. Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4913 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src')
-rw-r--r--src/include/pc80/i8254.h61
-rw-r--r--src/pc80/Config.lb1
-rw-r--r--src/pc80/Makefile.inc1
-rw-r--r--src/pc80/i8254.c55
4 files changed, 116 insertions, 2 deletions
diff --git a/src/include/pc80/i8254.h b/src/include/pc80/i8254.h
new file mode 100644
index 0000000000..b0d3a93fb3
--- /dev/null
+++ b/src/include/pc80/i8254.h
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 coresystems GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef PC80_I8254_H
+#define PC80_I8254_H
+
+/* Ports for the 8254 timer chip */
+#define TIMER0_PORT 0x40
+#define TIMER1_PORT 0x41
+#define TIMER2_PORT 0x42
+#define TIMER_MODE_PORT 0x43
+
+/* Meaning of the mode bits */
+#define TIMER0_SEL 0x00
+#define TIMER1_SEL 0x40
+#define TIMER2_SEL 0x80
+#define READBACK_SEL 0xC0
+
+#define LATCH_COUNT 0x00
+#define LOBYTE_ACCESS 0x10
+#define HIBYTE_ACCESS 0x20
+#define WORD_ACCESS 0x30
+
+#define MODE0 0x00
+#define MODE1 0x02
+#define MODE2 0x04
+#define MODE3 0x06
+#define MODE4 0x08
+#define MODE5 0x0A
+
+#define BINARY_COUNT 0x00
+#define BCD_COUNT 0x01
+
+/* Timers tick over at this rate */
+#define TICKS_PER_MS 1193
+
+/* Parallel Peripheral Controller Port B */
+#define PPC_PORTB 0x61
+
+/* Meaning of the port bits */
+#define PPCB_T2OUT 0x20 /* Bit 5 */
+#define PPCB_SPKR 0x02 /* Bit 1 */
+#define PPCB_T2GATE 0x01 /* Bit 0 */
+
+#endif
diff --git a/src/pc80/Config.lb b/src/pc80/Config.lb
index e05b76954c..24af51c208 100644
--- a/src/pc80/Config.lb
+++ b/src/pc80/Config.lb
@@ -5,7 +5,6 @@ uses CONFIG_ARCH_X86
object mc146818rtc.o
object isa-dma.o
object i8259.o
-#object udelay_timer2.o CONFIG_UDELAY_TIMER2
if CONFIG_UDELAY_IO
object udelay_io.o
diff --git a/src/pc80/Makefile.inc b/src/pc80/Makefile.inc
index 0ef591497a..c7c0cd5d0a 100644
--- a/src/pc80/Makefile.inc
+++ b/src/pc80/Makefile.inc
@@ -1,7 +1,6 @@
obj-y += mc146818rtc.o
obj-y += isa-dma.o
obj-y += i8259.o
-#obj-y += udelay_timer2.o CONFIG_UDELAY_TIMER2
obj-$(CONFIG_UDELAY_IO) += udelay_io.o
obj-y += keyboard.o
diff --git a/src/pc80/i8254.c b/src/pc80/i8254.c
new file mode 100644
index 0000000000..e5dc40b56b
--- /dev/null
+++ b/src/pc80/i8254.c
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 coresystems GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <pc80/i8254.h>
+#include <console/console.h>
+
+/* Initialize i8254 timers */
+
+void setup_i8254(void)
+{
+ /* Timer 0 (taken from biosemu) */
+ outb(TIMER0_SEL|WORD_ACCESS|MODE3|BINARY_COUNT, TIMER_MODE_PORT);
+ outb(0x00, TIMER0_PORT);
+ outb(0x00, TIMER0_PORT);
+
+ /* Timer 1 */
+ outb(TIMER1_SEL|LOBYTE_ACCESS|MODE3|BINARY_COUNT, TIMER_MODE_PORT);
+ outb(0x12, TIMER1_PORT);
+}
+
+#ifdef CONFIG_UDELAY_TIMER2
+static void load_timer2(unsigned int ticks)
+{
+ /* Set up the timer gate, turn off the speaker */
+ outb((inb(PPC_PORTB) & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
+ outb(TIMER2_SEL|WORD_ACCESS|MODE0|BINARY_COUNT, TIMER_MODE_PORT);
+ outb(ticks & 0xFF, TIMER2_PORT);
+ outb(ticks >> 8, TIMER2_PORT);
+}
+
+
+void udelay(int usecs)
+{
+ load_timer2((usecs*TICKS_PER_MS)/1000);
+ while ((inb(PPC_PORTB) & PPCB_T2OUT) == 0)
+ ;
+}
+#endif