svn commit: r237858 - projects/altix2/sys/ia64/sgisn

[Marcel Moolenaar]

Author: marcel
Date: Sat Jun 30 23:29:34 2012
New Revision: 237858
URL: http://svn.freebsd.org/changeset/base/237858

Log:
  Register a timecounter based on the SHub's RTC. As it happens the
  mandatory ACPI PM Timer isn't there on the SGI Altix.

Modified:
  projects/altix2/sys/ia64/sgisn/sgisn_shub.c

Modified: projects/altix2/sys/ia64/sgisn/sgisn_shub.c
==============================================================================
--- projects/altix2/sys/ia64/sgisn/sgisn_shub.c	Sat Jun 30 22:18:43 2012	(r237857)
+++ projects/altix2/sys/ia64/sgisn/sgisn_shub.c	Sat Jun 30 23:29:34 2012	(r237858)
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/malloc.h>
 #include <sys/pcpu.h>
 #include <sys/rman.h>
+#include <sys/timetc.h>
 
 #include <vm/vm.h>
 #include <vm/pmap.h>
@@ -62,6 +63,7 @@ struct sgisn_shub_softc {
 	bus_addr_t	sc_mmraddr;
 	bus_space_tag_t sc_tag;
 	bus_space_handle_t sc_hndl;
+	struct timecounter sc_rtc;
 	u_int		sc_domain;
 	u_int		sc_hubtype;	/* SHub type (0=SHub1, 1=SHub2) */
 	u_int		sc_nasid_mask;
@@ -130,6 +132,17 @@ static driver_t sgisn_shub_driver = {
 
 DRIVER_MODULE(shub, nexus, sgisn_shub_driver, sgisn_shub_devclass, 0, 0);
 
+static u_int
+sgisn_shub_get_rtc(struct timecounter *tc)
+{
+	struct sgisn_shub_softc *sc;
+	u_int rtc;
+
+	sc = tc->tc_priv;
+	rtc = bus_space_read_8(sc->sc_tag, sc->sc_hndl, SHUB_MMR_RTC);
+	return (rtc);
+}
+
 static int
 sgisn_shub_activate_resource(device_t dev, device_t child, int type, int rid,
     struct resource *res)
@@ -429,6 +442,18 @@ sgisn_shub_attach(device_t dev)
 		device_set_ivars(child, (void *)(uintptr_t)~0UL);
 	}
 
+	/* Use the SHub's RTC as a time counter. */
+	r = ia64_sal_entry(SAL_FREQ_BASE, 2, 0, 0, 0, 0, 0, 0);
+	if (r.sal_status == 0) {
+		sc->sc_rtc.tc_get_timecount = sgisn_shub_get_rtc;
+		sc->sc_rtc.tc_counter_mask = ~0U;
+		sc->sc_rtc.tc_frequency = r.sal_result[0];
+		sc->sc_rtc.tc_name = "SHub RTC";
+		sc->sc_rtc.tc_quality = (r.sal_result[0]) ? 1200 : 950;
+		sc->sc_rtc.tc_priv = sc;
+		tc_init(&sc->sc_rtc);
+	}
+
 	for (seg = 0; seg <= sc->sc_fwhub->hub_pci_maxseg; seg++) {
 		for (bus = 0; bus <= sc->sc_fwhub->hub_pci_maxbus; bus++) {
 			r = ia64_sal_entry(SAL_SGISN_IOBUS_INFO, seg, bus,