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Kirill Smelkov
linux
Commits
b8030f26
Commit
b8030f26
authored
Jan 05, 2004
by
Dave Jones
Committed by
Dave Jones
Jan 05, 2004
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[CPUFREQ] Support for 533 MHz FSB in speedstep driver.
parent
878a23b1
Changes
2
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2 changed files
with
35 additions
and
4 deletions
+35
-4
arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
+34
-3
arch/i386/kernel/cpu/cpufreq/speedstep-lib.h
arch/i386/kernel/cpu/cpufreq/speedstep-lib.h
+1
-1
No files found.
arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
View file @
b8030f26
...
...
@@ -106,14 +106,45 @@ static unsigned int pentium3_get_frequency (unsigned int processor)
static
unsigned
int
pentium4_get_frequency
(
void
)
{
u32
msr_lo
,
msr_hi
;
struct
cpuinfo_x86
*
c
=
&
boot_cpu_data
;
u32
msr_lo
,
msr_hi
,
mult
;
unsigned
int
fsb
=
0
;
rdmsr
(
0x2c
,
msr_lo
,
msr_hi
);
dprintk
(
KERN_DEBUG
"speedstep-lib: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x
\n
"
,
msr_lo
,
msr_hi
);
msr_lo
>>=
24
;
return
(
msr_lo
*
100000
);
/* decode the FSB: see IA-32 Intel (C) Architecture Software
* Developer's Manual, Volume 3: System Prgramming Guide,
* revision #12 in Table B-1: MSRs in the Pentium 4 and
* Intel Xeon Processors, on page B-4 and B-5.
*/
if
(
c
->
x86_model
<
2
)
fsb
=
100
*
1000
;
else
{
u8
fsb_code
=
(
msr_lo
>>
16
)
&
0x7
;
switch
(
fsb_code
)
{
case
0
:
fsb
=
100
*
1000
;
break
;
case
1
:
fsb
=
13333
*
10
;
break
;
case
2
:
fsb
=
200
*
1000
;
break
;
}
}
if
(
!
fsb
)
printk
(
KERN_DEBUG
"speedstep-lib: couldn't detect FSB speed. Please send an e-mail to <linux@brodo.de>
\n
"
);
/* Multiplier. */
mult
=
msr_lo
>>
24
;
dprintk
(
KERN_DEBUG
"speedstep-lib: P4 - FSB %u kHz; Multiplier %u
\n
"
,
fsb
,
mult
);
return
(
fsb
*
mult
);
}
...
...
arch/i386/kernel/cpu/cpufreq/speedstep-lib.h
View file @
b8030f26
...
...
@@ -15,7 +15,7 @@
#define SPEEDSTEP_PROCESSOR_PIII_C_EARLY 0x00000001
/* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000002
/* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000003
/* Tualatin core */
#define SPEEDSTEP_PROCESSOR_P4M 0x00000004
/* P4-M
with 100 MHz FSB
*/
#define SPEEDSTEP_PROCESSOR_P4M 0x00000004
/* P4-M */
/* speedstep states -- only two of them */
...
...
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