[src/trunk]: src/sys/arch/arm/cortex detach and re-attach timecounter when up...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/730d8ea61695
branches:  trunk
changeset: 805461:730d8ea61695
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Jan 02 23:19:28 2015 +0000

description:
detach and re-attach timecounter when updating freq, and reinit timer on each cpu

diffstat:

 sys/arch/arm/cortex/a9tmr.c |  19 +++++++++++++++++--
 1 files changed, 17 insertions(+), 2 deletions(-)

diffs (58 lines):

diff -r 369aa3886030 -r 730d8ea61695 sys/arch/arm/cortex/a9tmr.c
--- a/sys/arch/arm/cortex/a9tmr.c       Fri Jan 02 22:00:02 2015 +0000
+++ b/sys/arch/arm/cortex/a9tmr.c       Fri Jan 02 23:19:28 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: a9tmr.c,v 1.8 2015/01/02 21:58:03 jmcneill Exp $       */
+/*     $NetBSD: a9tmr.c,v 1.9 2015/01/02 23:19:28 jmcneill Exp $       */
 
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: a9tmr.c,v 1.8 2015/01/02 21:58:03 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: a9tmr.c,v 1.9 2015/01/02 23:19:28 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -40,6 +40,7 @@
 #include <sys/proc.h>
 #include <sys/systm.h>
 #include <sys/timetc.h>
+#include <sys/xcall.h>
 
 #include <prop/proplib.h>
 
@@ -248,17 +249,31 @@
        tc_init(&a9tmr_timecounter);
 }
 
+static void
+a9tmr_update_freq_cb(void *arg1, void *arg2)
+{
+       a9tmr_init_cpu_clock(curcpu());
+}
+
 void
 a9tmr_update_freq(uint32_t freq)
 {
        struct a9tmr_softc * const sc = &a9tmr_sc;
+       uint64_t xc;
 
        KASSERT(sc->sc_dev != NULL);
        KASSERT(freq != 0);
 
+       tc_detach(&a9tmr_timecounter);
+
        sc->sc_freq = freq;
        sc->sc_autoinc = sc->sc_freq / hz;
+
+       xc = xc_broadcast(0, a9tmr_update_freq_cb, NULL, NULL);
+       xc_wait(xc);
+
        a9tmr_timecounter.tc_frequency = sc->sc_freq;
+       tc_init(&a9tmr_timecounter);
 }
 
 void