From 20ef12080950c328702f590b53c50e328a03b971 Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Thu, 2 Oct 2008 18:49:42 -0400
Subject: [PATCH] Add ich2-timer.

---
 aseg/Makefile        |  5 ++++-
 ich2/ich2-timer.c    | 39 +++++++++++++++++++++++++++++++++++++++
 include/reg-82801b.h |  3 +++
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 ich2/ich2-timer.c

diff --git a/aseg/Makefile b/aseg/Makefile
index 8283648..3015bd7 100644
--- a/aseg/Makefile
+++ b/aseg/Makefile
@@ -1,6 +1,9 @@
 CC=gcc
 CFLAGS=-I../include -I../include/raw -nostdlib -nostdinc -fno-builtin -D__RAW__ -Wall -Werror -pedantic -ansi -std=gnu99
-OBJS=counter.o firstrun.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o ../ich2/smram-ich2.o ../ich2/smi.o vga-overlay.o packet.o ../lib/sprintf.o ../lib/doprnt.o ../pci/pci.o 3c905.o
+
+OBJS=counter.o firstrun.o ../pci/pci-raw.o ../lib/minilib.o ../lib/console.o \
+	../ich2/smram-ich2.o ../ich2/smi.o vga-overlay.o packet.o ../lib/sprintf.o \
+	../lib/doprnt.o ../pci/pci.o 3c905.o ../ich2/ich2-timer.o
 
 all: aseg.elf
 
diff --git a/ich2/ich2-timer.c b/ich2/ich2-timer.c
new file mode 100644
index 0000000..b98e381
--- /dev/null
+++ b/ich2/ich2-timer.c
@@ -0,0 +1,39 @@
+#include <pci.h>
+#include <io.h>
+#include <reg-82801b.h>
+
+static uint16_t _get_PMBASE()
+{
+	static long pmbase = -1;
+	
+	if (pmbase == -1)	/* Memoize it so that we don't have to hit PCI so often. */
+		pmbase = pci_read32(ICH2_LPC_BUS, ICH2_LPC_DEV, ICH2_LPC_FN, ICH2_LPC_PCI_PMBASE) & ICH2_PMBASE_MASK;
+	
+	return pmbase;
+}
+
+static unsigned long _curtmr()
+{
+	return inl(_get_PMBASE + ICH2_PMBASE_PM1_TMR) & 0xFFFFFF;
+}
+
+/* This is kind of a heuristic, since we can't get interrupts. */
+static unsigned long starttmr = 0, endtmr = 0;
+
+void oneshot_start_ms(unsigned long milliseconds)
+{
+	starttmr = _curtmr();
+	endtmr = (starttmr + milliseconds*(ICH2_PM1_TMR_FREQ/1000)) % 0xFFFFFF;
+}
+
+int oneshot_running(void)
+{
+	if (endtmr == 0 && starttmr == 0)
+		return 0;
+	if ((endtmr < starttmr) && ((_curtmr() > starttmr) || (_curtmr() < endtmr)))
+		return 1;
+	else if ((_curtmr() < endtmr) && (_curtmr() > starttmr))
+		return 1;
+	endtmr = starttmr = 0;
+	return 0;
+}
diff --git a/include/reg-82801b.h b/include/reg-82801b.h
index a60c458..4e116c2 100644
--- a/include/reg-82801b.h
+++ b/include/reg-82801b.h
@@ -44,6 +44,9 @@
 #define ICH2_PM1_EN_GBL_EN		(1 << 5)
 #define ICH2_PM1_EN_TMROF_EN		(1 << 0
 
+#define ICH2_PMBASE_PM1_TMR		0x08
+#define ICH2_PM1_TMR_FREQ		3579545		/* This will be the encryption key for a question on the test. */
+
 #define ICH2_PMBASE_SMI_EN		0x30
 #define ICH2_SMI_EN_PERIODIC_EN		(1 << 14)
 #define ICH2_SMI_EN_TCO_EN		(1 << 13)
-- 
2.39.2