From d9c89e4ca5b8ffba3ff406551fe3de5edefe2586 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Sun, 20 Jul 2008 10:37:43 +0000
Subject: [PATCH] Provide a timecounter based on the UltraSPARC IIe STICK
 logic.

---
 sys/arch/sparc64/dev/psycho.c    | 30 +++++++++++++++++++++++++++++-
 sys/arch/sparc64/dev/psychoreg.h |  9 ++++++++-
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/sys/arch/sparc64/dev/psycho.c b/sys/arch/sparc64/dev/psycho.c
index 42baeb77e5e..40c2c8baf38 100644
--- a/sys/arch/sparc64/dev/psycho.c
+++ b/sys/arch/sparc64/dev/psycho.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: psycho.c,v 1.60 2008/07/12 10:07:25 kettenis Exp $	*/
+/*	$OpenBSD: psycho.c,v 1.61 2008/07/20 10:37:43 kettenis Exp $	*/
 /*	$NetBSD: psycho.c,v 1.39 2001/10/07 20:30:41 eeh Exp $	*/
 
 /*
@@ -42,6 +42,7 @@
 #include <sys/malloc.h>
 #include <sys/systm.h>
 #include <sys/time.h>
+#include <sys/timetc.h>
 #include <sys/reboot.h>
 
 #include <uvm/uvm_extern.h>
@@ -123,6 +124,12 @@ void psycho_conf_write(pci_chipset_tag_t, pcitag_t, int, pcireg_t);
 /* base pci_chipset */
 extern struct sparc_pci_chipset _sparc_pci_chipset;
 
+u_int stick_get_timecount(struct timecounter *);
+
+struct timecounter stick_timecounter = {
+	stick_get_timecount, NULL, ~0u, 0, "stick", 1000, NULL
+};
+
 /*
  * autoconfiguration
  */
@@ -238,6 +245,7 @@ psycho_attach(struct device *parent, struct device *self, void *aux)
 	int psycho_br[2], n;
 	struct psycho_type *ptype;
 	char buf[32];
+	u_int stick_rate;
 
 	sc->sc_node = ma->ma_node;
 	sc->sc_bustag = ma->ma_bustag;
@@ -556,6 +564,18 @@ psycho_attach(struct device *parent, struct device *self, void *aux)
 		printf("\n");
 	}
 
+	/*
+	 * The UltraSPARC IIe has new STICK logic that provides a
+	 * timebase counter that doesn't scale with processor
+	 * frequency.  Use it to provide a timecounter.
+	 */
+	stick_rate = getpropint(findroot(), "stick-frequency", 0);
+	if (stick_rate > 0 && sc->sc_mode == PSYCHO_MODE_SABRE) {
+		stick_timecounter.tc_frequency = stick_rate;
+		stick_timecounter.tc_priv = sc;
+		tc_init(&stick_timecounter);
+	}
+
 	/*
 	 * attach the pci.. note we pass PCI A tags, etc., for the sabre here.
 	 */
@@ -1284,3 +1304,11 @@ psycho_sabre_dvmamap_sync(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map,
 	if (ops & (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_PREWRITE))
 		membar(MemIssue);
 }
+
+u_int
+stick_get_timecount(struct timecounter *tc)
+{
+	struct psycho_softc *sc = tc->tc_priv;
+
+	return psycho_psychoreg_read(sc, stick_reg_low);
+}
diff --git a/sys/arch/sparc64/dev/psychoreg.h b/sys/arch/sparc64/dev/psychoreg.h
index 93a01382129..5d174d76702 100644
--- a/sys/arch/sparc64/dev/psychoreg.h
+++ b/sys/arch/sparc64/dev/psychoreg.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: psychoreg.h,v 1.12 2008/07/12 13:08:04 kettenis Exp $	*/
+/*	$OpenBSD: psychoreg.h,v 1.13 2008/07/20 10:37:43 kettenis Exp $	*/
 /*	$NetBSD: psychoreg.h,v 1.6.4.2 2001/09/13 01:14:40 thorpej Exp $ */
 
 /*
@@ -219,6 +219,13 @@ struct psychoreg {
 		u_int64_t	pad19[208];
 	} psy_strbufdiag[2];					/* For PCI a and b */
 
+	u_int64_t	pad18[1036];
+
+	u_int64_t	stick_cmp_low;		/* STICK comparison low reg */			/* 1fe.0000.f060 */
+	u_int64_t	stick_cmp_high;		/* STICK comparison high reg */			/* 1fe.0000.f068 */
+	u_int64_t	stick_reg_low;		/* STICK counter low reg */			/* 1fe.0000.f070 */
+	u_int64_t	stick_reg_high;		/* STICK counter high reg */			/* 1fe.0000.f078 */
+
 	/* 
 	 * Here is the rest of the map, which we're not specifying:
 	 *
-- 
2.20.1