[src/trunk]: src/sys/arch/x86/x86 Get bus clock for some Atom processors.

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

details:   https://anonhg.NetBSD.org/src/rev/86f69e5e51a7
branches:  trunk
changeset: 791177:86f69e5e51a7
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Thu Nov 07 18:17:13 2013 +0000

description:
Get bus clock for some Atom processors.

diffstat:

 sys/arch/x86/x86/intel_busclock.c |  64 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 62 insertions(+), 2 deletions(-)

diffs (85 lines):

diff -r f2964c925b5f -r 86f69e5e51a7 sys/arch/x86/x86/intel_busclock.c
--- a/sys/arch/x86/x86/intel_busclock.c Thu Nov 07 17:50:18 2013 +0000
+++ b/sys/arch/x86/x86/intel_busclock.c Thu Nov 07 18:17:13 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: intel_busclock.c,v 1.13 2011/09/24 10:49:13 jym Exp $  */
+/*     $NetBSD: intel_busclock.c,v 1.14 2013/11/07 18:17:13 msaitoh Exp $      */
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: intel_busclock.c,v 1.13 2011/09/24 10:49:13 jym Exp $");
+__KERNEL_RCSID(0, "$NetBSD: intel_busclock.c,v 1.14 2013/11/07 18:17:13 msaitoh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -213,6 +213,66 @@
                        goto print_msr;
                }
                break;
+       case 0x1c: /* Atom */
+       case 0x26:
+       case 0x27:
+       case 0x35:
+       case 0x36:
+               if (rdmsr_safe(MSR_FSB_FREQ, &msr) == EFAULT) {
+                       aprint_debug_dev(ci->ci_dev,
+                           "unable to determine bus speed");
+                       goto print_msr;
+               }
+               bus = (msr >> 0) & 0x7;
+               switch (bus) {
+               case 7:
+                       bus_clock =  8333;
+                       break;
+               case 5:
+                       bus_clock = 10000;
+                       break;
+               case 1:
+                       bus_clock = 13333;
+                       break;
+               case 3:
+                       bus_clock = 16667;
+                       break;
+               default:
+                       aprint_debug("%s: unknown Atom FSB_FREQ value %d",
+                           device_xname(ci->ci_dev), bus);
+                       goto print_msr;
+               }
+               break;
+       case 0x37: /* Silvermont */
+       case 0x4d:
+               if (rdmsr_safe(MSR_FSB_FREQ, &msr) == EFAULT) {
+                       aprint_debug_dev(ci->ci_dev,
+                           "unable to determine bus speed");
+                       goto print_msr;
+               }
+               bus = (msr >> 0) & 0x7;
+               switch (bus) {
+               case 4:
+                       bus_clock =  8000;
+                       break;
+               case 0:
+                       bus_clock =  8333;
+                       break;
+               case 1:
+                       bus_clock = 10000;
+                       break;
+               case 2:
+                       bus_clock = 13333;
+                       break;
+               case 3:
+                       bus_clock = 16667;
+                       break;
+               default:
+                       aprint_debug("%s: unknown Silvermont FSB_FREQ value %d",
+                           device_xname(ci->ci_dev), bus);
+                       goto print_msr;
+               }
+               break;
        default:
                aprint_debug("%s: unknown i686 model %d, can't get bus clock",
                    device_xname(ci->ci_dev),