--- /dev/null
+/* ich2-timer.c
+ * High precision timer routines for ICH2 southbridge
+ * NetWatch system management mode administration console
+ *
+ * Copyright (c) 2008 Jacob Potter and Joshua Wise. All rights reserved.
+ * This program is free software; you can redistribute and/or modify it under
+ * the terms found in the file LICENSE in the root of this source tree.
+ *
+ */
+
+#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)
+{
+ unsigned long time = _curtmr();
+
+ if (endtmr == 0 && starttmr == 0)
+ return 0;
+ if ((endtmr < starttmr) && ((time > starttmr) || (time < endtmr)))
+ return 1;
+ else if ((time < endtmr) && (time > starttmr))
+ return 1;
+ endtmr = starttmr = 0;
+ return 0;
+}