Merge pull request #1808 from abjoshi-brcm/timer_arm64

arm64: add timer support

AUTHORS

@@ -8,6 +8,8 @@ Github.com pull request).  Note that these email addresses are not
 guaranteed to be current; they are simply a unique indicator of the
 individual who committed them.
 
+Abhishek Joshi, Broadcom
+  abhishek.joshi@broadcom.com
 Abhishek Kulkarni, Indiana University
   adkulkar@cs.indiana.edu
 Adrian Knoth, Friedrich-Schiller-Universitat Jena

opal/include/opal/sys/arm64/timer.h

@@ -2,6 +2,7 @@
  * Copyright (c) 2008      The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
+ * Copyright (c) 2016      Broadcom Limited. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -20,14 +21,21 @@ static inline opal_timer_t
 opal_sys_timer_get_cycles(void)
 {
     opal_timer_t ret;
-    struct tms accurate_clock;
 
-    times(&accurate_clock);
-    ret = accurate_clock.tms_utime + accurate_clock.tms_stime;
+     __asm__ __volatile__ ("mrs %0,  CNTVCT_EL0" : "=r" (ret));
 
     return ret;
 }
 
+
+static inline opal_timer_t
+opal_sys_timer_freq(void)
+{
+        opal_timer_t freq;
+        __asm__ __volatile__ ("mrs %0,  CNTFRQ_EL0" : "=r" (freq));
+        return (opal_timer_t)(freq);
+}
+
 #define OPAL_HAVE_SYS_TIMER_GET_CYCLES 1
 
 #endif /* ! OPAL_SYS_ARCH_TIMER_H */

opal/include/opal/sys/timer.h

@@ -9,6 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
+ * Copyright (c) 2016      Broadcom Limited. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -84,6 +85,8 @@ BEGIN_C_DECLS
 #include "opal/sys/amd64/timer.h"
 #elif OPAL_ASSEMBLY_ARCH == OPAL_ARM
 #include "opal/sys/arm/timer.h"
+#elif OPAL_ASSEMBLY_ARCH == OPAL_ARM64
+#include "opal/sys/arm64/timer.h"
 #elif OPAL_ASSEMBLY_ARCH == OPAL_IA32
 #include "opal/sys/ia32/timer.h"
 #elif OPAL_ASSEMBLY_ARCH == OPAL_IA64

opal/mca/timer/linux/configure.m4

@@ -13,6 +13,7 @@
 # Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved.
 # Copyright (c) 2015      Research Organization for Information Science
 #                         and Technology (RIST). All rights reserved.
+# Copyright (c) 2016      Broadcom Limited. All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -46,7 +47,7 @@ AC_DEFUN([MCA_opal_timer_linux_CONFIG],[
                  [timer_linux_happy="no"])])
 
    case "${host}" in
-   i?86-*linux*|x86_64*linux*|ia64-*linux*|powerpc-*linux*|powerpc64-*linux*|sparc*-*linux*)
+   i?86-*linux*|x86_64*linux*|ia64-*linux*|powerpc-*linux*|powerpc64-*linux*|sparc*-*linux*|aarch64-*linux*)
         AS_IF([test "$timer_linux_happy" = "yes"],
               [AS_IF([test -r "/proc/cpuinfo"],
                      [timer_linux_happy="yes"],

opal/mca/timer/linux/timer_linux_component.c

@@ -15,6 +15,7 @@
  * Copyright (c) 2015      Los Alamos National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2015 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2016 Broadcom Limited. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -107,6 +108,10 @@ static int opal_timer_linux_find_freq(void)
 
     opal_timer_linux_freq = 0;
 
+#if OPAL_ASSEMBLY_ARCH == OPAL_ARM64
+	opal_timer_linux_freq = opal_sys_timer_freq();
+#endif
+
     if (0 == opal_timer_linux_freq) {
         /* first, look for a timebase field.  probably only on PPC,
            but one never knows */