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Kirill Smelkov
linux
Commits
3f669609
Commit
3f669609
authored
Feb 13, 2003
by
Dave Jones
Browse files
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Plain Diff
[CPUFREQ] Add powernow-k7 driver for AMD mobile Athlon/Duron CPUs.
parent
7f939798
Changes
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+471
-0
arch/i386/Kconfig
arch/i386/Kconfig
+10
-0
arch/i386/kernel/cpu/cpufreq/Makefile
arch/i386/kernel/cpu/cpufreq/Makefile
+1
-0
arch/i386/kernel/cpu/cpufreq/powernow-k7.c
arch/i386/kernel/cpu/cpufreq/powernow-k7.c
+408
-0
arch/i386/kernel/cpu/cpufreq/powernow-k7.h
arch/i386/kernel/cpu/cpufreq/powernow-k7.h
+52
-0
No files found.
arch/i386/Kconfig
View file @
3f669609
...
@@ -1005,6 +1005,16 @@ config X86_POWERNOW_K6
...
@@ -1005,6 +1005,16 @@ config X86_POWERNOW_K6
If in doubt, say N.
If in doubt, say N.
config X86_POWERNOW_K7
tristate "AMD Mobile Athlon/Duron PowerNow!"
depends on CPU_FREQ
help
This adds the CPUFreq driver for mobile AMD K7 mobile processors.
For details, take a look at linux/Documentation/cpufreq.
If in doubt, say N.
config ELAN_CPUFREQ
config ELAN_CPUFREQ
tristate "AMD Elan"
tristate "AMD Elan"
depends on CPU_FREQ && MELAN
depends on CPU_FREQ && MELAN
...
...
arch/i386/kernel/cpu/cpufreq/Makefile
View file @
3f669609
obj-$(CONFIG_X86_POWERNOW_K6)
+=
powernow-k6.o
obj-$(CONFIG_X86_POWERNOW_K6)
+=
powernow-k6.o
obj-$(CONFIG_X86_POWERNOW_K7)
+=
powernow-k7.o
obj-$(CONFIG_X86_LONGHAUL)
+=
longhaul.o
obj-$(CONFIG_X86_LONGHAUL)
+=
longhaul.o
obj-$(CONFIG_X86_SPEEDSTEP)
+=
speedstep.o
obj-$(CONFIG_X86_SPEEDSTEP)
+=
speedstep.o
obj-$(CONFIG_X86_P4_CLOCKMOD)
+=
p4-clockmod.o
obj-$(CONFIG_X86_P4_CLOCKMOD)
+=
p4-clockmod.o
...
...
arch/i386/kernel/cpu/cpufreq/powernow-k7.c
0 → 100644
View file @
3f669609
/*
* $Id: powernow-k7.c,v 1.31 2003/02/12 21:16:35 davej Exp $
*
* (C) 2003 Dave Jones <davej@suse.de>
*
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*
* Errata 5: Processor may fail to execute a FID/VID change in presence of interrupt.
* - We cli/sti on stepping A0 CPUs around the FID/VID transition.
* Errata 15: Processors with half frequency multipliers may hang upon wakeup from disconnect.
* - We disable half multipliers if ACPI is used on A0 stepping CPUs.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/msr.h>
#include <asm/timex.h>
#include <asm/io.h>
#include "powernow-k7.h"
#define DEBUG
#ifdef DEBUG
#define dprintk(msg...) printk(msg)
#else
#define dprintk(msg...) do { } while(0);
#endif
#define PFX "powernow: "
struct
psb_s
{
u8
signature
[
10
];
u8
tableversion
;
u8
flags
;
u16
settlingtime
;
u8
reserved1
;
u8
numpst
;
};
struct
pst_s
{
u32
cpuid
;
u8
fsbspeed
;
u8
maxfid
;
u8
startvid
;
u8
numpstates
;
};
/* divide by 1000 to get VID. */
static
int
mobile_vid_table
[
32
]
=
{
2000
,
1950
,
1900
,
1850
,
1800
,
1750
,
1700
,
1650
,
1600
,
1550
,
1500
,
1450
,
1400
,
1350
,
1300
,
0
,
1275
,
1250
,
1225
,
1200
,
1175
,
1150
,
1125
,
1100
,
1075
,
1050
,
1024
,
1000
,
975
,
950
,
925
,
0
,
};
/* divide by 10 to get FID. */
static
int
fid_codes
[
32
]
=
{
110
,
115
,
120
,
125
,
50
,
55
,
60
,
65
,
70
,
75
,
80
,
85
,
90
,
95
,
10
,
105
,
30
,
190
,
40
,
200
,
130
,
135
,
140
,
210
,
150
,
225
,
160
,
165
,
170
,
180
,
-
1
,
-
1
,
};
static
struct
cpufreq_driver
powernow_driver
;
static
struct
cpufreq_frequency_table
*
powernow_table
;
static
unsigned
int
can_scale_bus
;
static
unsigned
int
can_scale_vid
;
static
unsigned
int
minimum_speed
=-
1
;
static
unsigned
int
maximum_speed
;
static
unsigned
int
number_scales
;
static
unsigned
int
fsb
;
static
unsigned
int
latency
;
static
char
have_a0
;
#ifndef rdmsrl
#define rdmsrl(msr,val) do {unsigned long l__,h__; \
rdmsr (msr, l__, h__); \
val = l__; \
val |= ((u64)h__<<32); \
} while(0);
#endif
#ifndef wrmsrl
static
void
wrmsrl
(
u32
msr
,
u64
val
)
{
u32
lo
,
hi
;
lo
=
(
u32
)
val
;
hi
=
val
>>
32
;
wrmsr
(
msr
,
lo
,
hi
);
}
#endif
static
int
check_powernow
(
void
)
{
struct
cpuinfo_x86
*
c
=
cpu_data
;
unsigned
int
maxei
,
eax
,
ebx
,
ecx
,
edx
;
if
(
c
->
x86_vendor
!=
X86_VENDOR_AMD
)
{
printk
(
KERN_INFO
PFX
"AMD processor not detected.
\n
"
);
return
0
;
}
if
(
c
->
x86
!=
6
)
{
printk
(
KERN_INFO
PFX
"This module only works with AMD K7 CPUs
\n
"
);
return
0
;
}
printk
(
KERN_INFO
PFX
"AMD K7 CPU detected.
\n
"
);
if
((
c
->
x86_model
==
6
)
&&
(
c
->
x86_mask
==
0
))
{
printk
(
KERN_INFO
PFX
"K7 660[A0] core detected, enabling errata workarounds
\n
"
);
have_a0
=
1
;
}
/* Get maximum capabilities */
maxei
=
cpuid_eax
(
0x80000000
);
if
(
maxei
<
0x80000007
)
{
/* Any powernow info ? */
printk
(
KERN_INFO
PFX
"No powernow capabilities detected
\n
"
);
return
0
;
}
cpuid
(
0x80000007
,
&
eax
,
&
ebx
,
&
ecx
,
&
edx
);
printk
(
KERN_INFO
PFX
"PowerNOW! Technology present. Can scale: "
);
if
(
edx
&
1
<<
1
)
{
printk
(
"frequency"
);
can_scale_bus
=
1
;
}
if
((
edx
&
(
1
<<
1
|
1
<<
2
))
==
0x6
)
printk
(
" and "
);
if
(
edx
&
1
<<
2
)
{
printk
(
"voltage"
);
can_scale_vid
=
1
;
}
if
(
!
(
edx
&
(
1
<<
1
|
1
<<
2
)))
{
printk
(
" nothing.
\n
"
);
return
0
;
}
printk
(
".
\n
"
);
return
1
;
}
static
int
get_ranges
(
unsigned
char
*
pst
)
{
int
j
;
u8
fid
,
vid
;
unsigned
int
speed
;
powernow_table
=
kmalloc
((
sizeof
(
struct
cpufreq_frequency_table
)
*
(
number_scales
+
1
)),
GFP_KERNEL
);
if
(
!
powernow_table
)
return
-
ENOMEM
;
memset
(
powernow_table
,
0
,
(
sizeof
(
struct
cpufreq_frequency_table
)
*
(
number_scales
+
1
)));
for
(
j
=
0
;
j
<
number_scales
;
j
++
)
{
fid
=
*
pst
++
;
powernow_table
[
j
].
frequency
=
fsb
*
fid_codes
[
fid
]
*
100
;
powernow_table
[
j
].
index
=
fid
;
/* lower 8 bits */
speed
=
fsb
*
(
fid_codes
[
fid
]
/
10
);
if
((
fid_codes
[
fid
]
%
10
)
==
5
)
{
speed
+=
fsb
/
2
;
#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
if
(
have_a0
==
1
)
powernow_table
[
j
].
frequency
=
CPUFREQ_ENTRY_INVALID
;
#endif
}
dprintk
(
KERN_INFO
PFX
" FID: 0x%x (%d.%dx [%dMHz])
\t
"
,
fid
,
fid_codes
[
fid
]
/
10
,
fid_codes
[
fid
]
%
10
,
speed
);
if
(
speed
<
minimum_speed
)
minimum_speed
=
speed
;
if
(
speed
>
maximum_speed
)
maximum_speed
=
speed
;
vid
=
*
pst
++
;
powernow_table
[
j
].
index
|=
(
vid
<<
8
);
/* upper 8 bits */
dprintk
(
"VID: 0x%x (%d.%dV)
\n
"
,
vid
,
mobile_vid_table
[
vid
]
/
1000
,
mobile_vid_table
[
vid
]
%
1000
);
}
dprintk
(
"
\n
"
);
powernow_table
[
number_scales
].
frequency
=
CPUFREQ_TABLE_END
;
powernow_table
[
number_scales
].
index
=
0
;
return
0
;
}
static
void
change_speed
(
unsigned
int
index
)
{
u8
fid
,
vid
;
struct
cpufreq_freqs
freqs
;
union
msr_fidvidstatus
fidvidstatus
;
union
msr_fidvidctl
fidvidctl
;
/* fid are the lower 8 bits of the index we stored into
* the cpufreq frequency table in powernow_decode_bios,
* vid are the upper 8 bits.
*/
fid
=
powernow_table
[
index
].
index
&
0xFF
;
vid
=
(
powernow_table
[
index
].
index
&
0xFF00
)
>>
8
;
freqs
.
cpu
=
0
;
rdmsrl
(
MSR_K7_FID_VID_STATUS
,
fidvidstatus
.
val
);
freqs
.
old
=
fsb
*
fid_codes
[
fidvidstatus
.
bits
.
CFID
]
*
100
;
freqs
.
new
=
powernow_table
[
index
].
frequency
;
cpufreq_notify_transition
(
&
freqs
,
CPUFREQ_PRECHANGE
);
/* Now do the magic poking into the MSRs. */
if
(
have_a0
==
1
)
/* A0 errata 5 */
__asm__
(
"
\t
cli
\n
"
);
rdmsrl
(
MSR_K7_FID_VID_CTL
,
fidvidctl
.
val
);
fidvidctl
.
bits
.
SGTC
=
latency
;
/* Stop grant timeout counter */
fidvidctl
.
bits
.
FID
=
fid
;
fidvidctl
.
bits
.
VID
=
vid
;
/* Note, we could set these lazily. Ie, only do voltage transition
if its changed since last time (Some speeds have the same voltage) */
fidvidctl
.
bits
.
FIDC
=
1
;
fidvidctl
.
bits
.
VIDC
=
1
;
wrmsrl
(
MSR_K7_FID_VID_CTL
,
fidvidctl
.
val
);
if
(
have_a0
==
1
)
__asm__
(
"
\t
sti
\n
"
);
cpufreq_notify_transition
(
&
freqs
,
CPUFREQ_POSTCHANGE
);
}
int
powernow_decode_bios
(
int
maxfid
,
int
startvid
)
{
struct
psb_s
*
psb
;
struct
pst_s
*
pst
;
struct
cpuinfo_x86
*
c
=
cpu_data
;
unsigned
int
i
,
j
;
unsigned
char
*
p
;
unsigned
int
etuple
;
unsigned
int
ret
;
etuple
=
cpuid_eax
(
0x80000001
);
etuple
&=
0xf00
;
etuple
|=
(
c
->
x86_model
<<
4
)
|
(
c
->
x86_mask
);
for
(
i
=
0xC0000
;
i
<
0xffff0
;
i
+=
16
)
{
p
=
phys_to_virt
(
i
);
if
(
memcmp
(
p
,
"AMDK7PNOW!"
,
10
)
==
0
){
dprintk
(
KERN_INFO
PFX
"Found PSB header at %p
\n
"
,
p
);
psb
=
(
struct
psb_s
*
)
p
;
dprintk
(
KERN_INFO
PFX
"Table version: 0x%x
\n
"
,
psb
->
tableversion
);
if
(
psb
->
tableversion
!=
0x12
)
{
printk
(
KERN_INFO
PFX
"Sorry, only v1.2 tables supported right now
\n
"
);
return
-
ENODEV
;
}
dprintk
(
KERN_INFO
PFX
"Flags: 0x%x ("
,
psb
->
flags
);
if
((
psb
->
flags
&
1
)
==
0
)
{
dprintk
(
"Mobile"
);
}
else
{
dprintk
(
"Desktop"
);
}
dprintk
(
" voltage regulator)
\n
"
);
latency
=
psb
->
settlingtime
;
dprintk
(
KERN_INFO
PFX
"Settling Time: %d microseconds.
\n
"
,
psb
->
settlingtime
);
dprintk
(
KERN_INFO
PFX
"Has %d PST tables. (Only dumping ones relevant to this CPU).
\n
"
,
psb
->
numpst
);
p
+=
sizeof
(
struct
psb_s
);
pst
=
(
struct
pst_s
*
)
p
;
for
(
i
=
0
;
i
<
psb
->
numpst
;
i
++
)
{
pst
=
(
struct
pst_s
*
)
p
;
number_scales
=
pst
->
numpstates
;
if
((
etuple
==
pst
->
cpuid
)
&&
(
maxfid
==
pst
->
maxfid
)
&&
(
startvid
==
pst
->
startvid
))
{
dprintk
(
KERN_INFO
PFX
"PST:%d (@%p)
\n
"
,
i
,
pst
);
dprintk
(
KERN_INFO
PFX
" cpuid: 0x%x
\t
"
,
pst
->
cpuid
);
dprintk
(
"fsb: %d
\t
"
,
pst
->
fsbspeed
);
dprintk
(
"maxFID: 0x%x
\t
"
,
pst
->
maxfid
);
dprintk
(
"startvid: 0x%x
\n
"
,
pst
->
startvid
);
fsb
=
pst
->
fsbspeed
;
ret
=
get_ranges
((
char
*
)
pst
+
sizeof
(
struct
pst_s
));
return
ret
;
}
else
{
p
=
(
char
*
)
pst
+
sizeof
(
struct
pst_s
);
for
(
j
=
0
;
j
<
number_scales
;
j
++
)
p
+=
2
;
}
}
return
-
EINVAL
;
}
p
++
;
}
return
-
ENODEV
;
}
static
int
powernow_target
(
struct
cpufreq_policy
*
policy
,
unsigned
int
target_freq
,
unsigned
int
relation
)
{
unsigned
int
newstate
;
if
(
cpufreq_frequency_table_target
(
policy
,
powernow_table
,
target_freq
,
relation
,
&
newstate
))
return
-
EINVAL
;
change_speed
(
newstate
);
return
0
;
}
static
int
powernow_verify
(
struct
cpufreq_policy
*
policy
)
{
return
cpufreq_frequency_table_verify
(
policy
,
powernow_table
);
}
static
int
__init
powernow_cpu_init
(
struct
cpufreq_policy
*
policy
)
{
union
msr_fidvidstatus
fidvidstatus
;
int
result
;
if
(
policy
->
cpu
!=
0
)
return
-
ENODEV
;
rdmsrl
(
MSR_K7_FID_VID_STATUS
,
fidvidstatus
.
val
);
result
=
powernow_decode_bios
(
fidvidstatus
.
bits
.
MFID
,
fidvidstatus
.
bits
.
SVID
);
if
(
result
)
return
result
;
printk
(
KERN_INFO
PFX
"Minimum speed %d MHz. Maximum speed %d MHz.
\n
"
,
minimum_speed
,
maximum_speed
);
policy
->
policy
=
CPUFREQ_POLICY_PERFORMANCE
;
policy
->
cpuinfo
.
transition_latency
=
latency
;
#ifdef CONFIG_CPU_FREQ_24_API
powernow_driver
.
cpu_cur_freq
[
policy
->
cpu
]
=
maximum_speed
;
#endif
return
cpufreq_frequency_table_cpuinfo
(
policy
,
powernow_table
);
}
static
int
__init
powernow_init
(
void
)
{
if
(
check_powernow
()
==
0
)
return
-
ENODEV
;
return
cpufreq_register_driver
(
&
powernow_driver
);
}
static
void
__exit
powernow_exit
(
void
)
{
cpufreq_unregister_driver
(
&
powernow_driver
);
if
(
powernow_table
)
kfree
(
powernow_table
);
}
static
struct
cpufreq_driver
powernow_driver
=
{
.
verify
=
powernow_verify
,
.
target
=
powernow_target
,
.
init
=
powernow_cpu_init
,
.
name
=
"powernow-k7"
,
};
MODULE_AUTHOR
(
"Dave Jones <davej@suse.de>"
);
MODULE_DESCRIPTION
(
"Powernow driver for AMD K7 processors."
);
MODULE_LICENSE
(
"GPL"
);
module_init
(
powernow_init
);
module_exit
(
powernow_exit
);
arch/i386/kernel/cpu/cpufreq/powernow-k7.h
0 → 100644
View file @
3f669609
/*
* $Id: powernow-k7.h,v 1.2 2003/02/10 18:26:01 davej Exp $
* (C) 2003 Dave Jones.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* AMD-specific information
*
*/
#ifndef MSR_K7_FID_VID_CTL
#define MSR_K7_FID_VID_CTL 0xc0010041
#endif
#ifndef MSR_K7_FID_VID_STATUS
#define MSR_K7_FID_VID_STATUS 0xc0010042
#endif
union
msr_fidvidctl
{
struct
{
unsigned
FID
:
5
,
// 4:0
reserved1:
3
,
// 7:5
VID:
5
,
// 12:8
reserved2:
3
,
// 15:13
FIDC:
1
,
// 16
VIDC:
1
,
// 17
reserved3:
2
,
// 19:18
FIDCHGRATIO:
1
,
// 20
reserved4:
11
,
// 31-21
SGTC:
20
,
// 32:51
reserved5:
12
;
// 63:52
}
bits
;
unsigned
long
long
val
;
};
union
msr_fidvidstatus
{
struct
{
unsigned
CFID
:
5
,
// 4:0
reserved1:
3
,
// 7:5
SFID:
5
,
// 12:8
reserved2:
3
,
// 15:13
MFID:
5
,
// 20:16
reserved3:
11
,
// 31:21
CVID:
5
,
// 36:32
reserved4:
3
,
// 39:37
SVID:
5
,
// 44:40
reserved5:
3
,
// 47:45
MVID:
5
,
// 52:48
reserved6:
11
;
// 63:53
}
bits
;
unsigned
long
long
val
;
};
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