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nexedi
linux
Commits
d1000edd
Commit
d1000edd
authored
Mar 28, 2012
by
Paul Mundt
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Merge branch 'sh/cpufreq' into sh-latest
parents
344dd2f4
3cbb08ae
Changes
1
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1 changed file
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82 additions
and
39 deletions
+82
-39
arch/sh/kernel/cpufreq.c
arch/sh/kernel/cpufreq.c
+82
-39
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arch/sh/kernel/cpufreq.c
View file @
d1000edd
...
...
@@ -3,7 +3,7 @@
*
* cpufreq driver for the SuperH processors.
*
* Copyright (C) 2002 - 20
07
Paul Mundt
* Copyright (C) 2002 - 20
12
Paul Mundt
* Copyright (C) 2002 M. R. Brown
*
* Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
...
...
@@ -14,6 +14,8 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) "cpufreq: " fmt
#include <linux/types.h>
#include <linux/cpufreq.h>
#include <linux/kernel.h>
...
...
@@ -21,15 +23,18 @@
#include <linux/init.h>
#include <linux/err.h>
#include <linux/cpumask.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/sched.h>
/* set_cpus_allowed() */
#include <linux/clk.h>
#include <linux/percpu.h>
#include <linux/sh_clk.h>
static
struct
clk
*
cpuclk
;
static
DEFINE_PER_CPU
(
struct
clk
,
sh_cpuclk
)
;
static
unsigned
int
sh_cpufreq_get
(
unsigned
int
cpu
)
{
return
(
clk_get_rate
(
cpuclk
)
+
500
)
/
1000
;
return
(
clk_get_rate
(
&
per_cpu
(
sh_cpuclk
,
cpu
)
)
+
500
)
/
1000
;
}
/*
...
...
@@ -40,8 +45,10 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
unsigned
int
relation
)
{
unsigned
int
cpu
=
policy
->
cpu
;
struct
clk
*
cpuclk
=
&
per_cpu
(
sh_cpuclk
,
cpu
);
cpumask_t
cpus_allowed
;
struct
cpufreq_freqs
freqs
;
struct
device
*
dev
;
long
freq
;
if
(
!
cpu_online
(
cpu
))
...
...
@@ -52,13 +59,15 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
BUG_ON
(
smp_processor_id
()
!=
cpu
);
dev
=
get_cpu_device
(
cpu
);
/* Convert target_freq from kHz to Hz */
freq
=
clk_round_rate
(
cpuclk
,
target_freq
*
1000
);
if
(
freq
<
(
policy
->
min
*
1000
)
||
freq
>
(
policy
->
max
*
1000
))
return
-
EINVAL
;
pr_debug
(
"cpufreq:
requested frequency %u Hz
\n
"
,
target_freq
*
1000
);
dev_dbg
(
dev
,
"
requested frequency %u Hz
\n
"
,
target_freq
*
1000
);
freqs
.
cpu
=
cpu
;
freqs
.
old
=
sh_cpufreq_get
(
cpu
);
...
...
@@ -70,78 +79,112 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
clk_set_rate
(
cpuclk
,
freq
);
cpufreq_notify_transition
(
&
freqs
,
CPUFREQ_POSTCHANGE
);
pr_debug
(
"cpufreq: set frequency %lu Hz
\n
"
,
freq
);
dev_dbg
(
dev
,
"set frequency %lu Hz
\n
"
,
freq
);
return
0
;
}
static
int
sh_cpufreq_verify
(
struct
cpufreq_policy
*
policy
)
{
struct
clk
*
cpuclk
=
&
per_cpu
(
sh_cpuclk
,
policy
->
cpu
);
struct
cpufreq_frequency_table
*
freq_table
;
freq_table
=
cpuclk
->
nr_freqs
?
cpuclk
->
freq_table
:
NULL
;
if
(
freq_table
)
return
cpufreq_frequency_table_verify
(
policy
,
freq_table
);
cpufreq_verify_within_limits
(
policy
,
policy
->
cpuinfo
.
min_freq
,
policy
->
cpuinfo
.
max_freq
);
policy
->
min
=
(
clk_round_rate
(
cpuclk
,
1
)
+
500
)
/
1000
;
policy
->
max
=
(
clk_round_rate
(
cpuclk
,
~
0UL
)
+
500
)
/
1000
;
cpufreq_verify_within_limits
(
policy
,
policy
->
cpuinfo
.
min_freq
,
policy
->
cpuinfo
.
max_freq
);
return
0
;
}
static
int
sh_cpufreq_cpu_init
(
struct
cpufreq_policy
*
policy
)
{
if
(
!
cpu_online
(
policy
->
cpu
))
unsigned
int
cpu
=
policy
->
cpu
;
struct
clk
*
cpuclk
=
&
per_cpu
(
sh_cpuclk
,
cpu
);
struct
cpufreq_frequency_table
*
freq_table
;
struct
device
*
dev
;
if
(
!
cpu_online
(
cpu
))
return
-
ENODEV
;
cpuclk
=
clk_get
(
NULL
,
"cpu_clk"
);
dev
=
get_cpu_device
(
cpu
);
cpuclk
=
clk_get
(
dev
,
"cpu_clk"
);
if
(
IS_ERR
(
cpuclk
))
{
printk
(
KERN_ERR
"cpufreq: couldn't get CPU#%d clk
\n
"
,
policy
->
cpu
);
dev_err
(
dev
,
"couldn't get CPU clk
\n
"
);
return
PTR_ERR
(
cpuclk
);
}
/* cpuinfo and default policy values */
policy
->
cpuinfo
.
min_freq
=
(
clk_round_rate
(
cpuclk
,
1
)
+
500
)
/
1000
;
policy
->
cpuinfo
.
max_freq
=
(
clk_round_rate
(
cpuclk
,
~
0UL
)
+
500
)
/
1000
;
policy
->
cpuinfo
.
transition_latency
=
CPUFREQ_ETERNAL
;
policy
->
cur
=
policy
->
min
=
policy
->
max
=
sh_cpufreq_get
(
cpu
);
policy
->
cur
=
sh_cpufreq_get
(
policy
->
cpu
)
;
policy
->
min
=
policy
->
cpuinfo
.
min_freq
;
policy
->
max
=
policy
->
cpuinfo
.
max_freq
;
freq_table
=
cpuclk
->
nr_freqs
?
cpuclk
->
freq_table
:
NULL
;
if
(
freq_table
)
{
int
result
;
/*
* Catch the cases where the clock framework hasn't been wired up
* properly to support scaling.
*/
if
(
unlikely
(
policy
->
min
==
policy
->
max
))
{
printk
(
KERN_ERR
"cpufreq: clock framework rate rounding "
"not supported on CPU#%d.
\n
"
,
policy
->
cpu
);
result
=
cpufreq_frequency_table_cpuinfo
(
policy
,
freq_table
);
if
(
!
result
)
cpufreq_frequency_table_get_attr
(
freq_table
,
cpu
);
}
else
{
dev_notice
(
dev
,
"no frequency table found, falling back "
"to rate rounding.
\n
"
);
clk_put
(
cpuclk
);
return
-
EINVAL
;
policy
->
cpuinfo
.
min_freq
=
(
clk_round_rate
(
cpuclk
,
1
)
+
500
)
/
1000
;
policy
->
cpuinfo
.
max_freq
=
(
clk_round_rate
(
cpuclk
,
~
0UL
)
+
500
)
/
1000
;
}
printk
(
KERN_INFO
"cpufreq: CPU#%d Frequencies - Minimum %u.%03u MHz, "
policy
->
min
=
policy
->
cpuinfo
.
min_freq
;
policy
->
max
=
policy
->
cpuinfo
.
max_freq
;
policy
->
cpuinfo
.
transition_latency
=
CPUFREQ_ETERNAL
;
dev_info
(
dev
,
"CPU Frequencies - Minimum %u.%03u MHz, "
"Maximum %u.%03u MHz.
\n
"
,
policy
->
cpu
,
policy
->
min
/
1000
,
policy
->
min
%
1000
,
policy
->
min
/
1000
,
policy
->
min
%
1000
,
policy
->
max
/
1000
,
policy
->
max
%
1000
);
return
0
;
}
static
int
sh_cpufreq_
verify
(
struct
cpufreq_policy
*
policy
)
static
int
sh_cpufreq_
cpu_exit
(
struct
cpufreq_policy
*
policy
)
{
cpufreq_verify_within_limits
(
policy
,
policy
->
cpuinfo
.
min_freq
,
policy
->
cpuinfo
.
max_freq
);
return
0
;
}
unsigned
int
cpu
=
policy
->
cpu
;
struct
clk
*
cpuclk
=
&
per_cpu
(
sh_cpuclk
,
cpu
);
static
int
sh_cpufreq_exit
(
struct
cpufreq_policy
*
policy
)
{
cpufreq_frequency_table_put_attr
(
cpu
);
clk_put
(
cpuclk
);
return
0
;
}
static
struct
freq_attr
*
sh_freq_attr
[]
=
{
&
cpufreq_freq_attr_scaling_available_freqs
,
NULL
,
};
static
struct
cpufreq_driver
sh_cpufreq_driver
=
{
.
owner
=
THIS_MODULE
,
.
name
=
"sh"
,
.
init
=
sh_cpufreq_cpu_init
,
.
verify
=
sh_cpufreq_verify
,
.
target
=
sh_cpufreq_target
,
.
get
=
sh_cpufreq_get
,
.
exit
=
sh_cpufreq_exit
,
.
target
=
sh_cpufreq_target
,
.
verify
=
sh_cpufreq_verify
,
.
init
=
sh_cpufreq_cpu_init
,
.
exit
=
sh_cpufreq_cpu_exit
,
.
attr
=
sh_freq_attr
,
};
static
int
__init
sh_cpufreq_module_init
(
void
)
{
pr
intk
(
KERN_INFO
"cpufreq:
SuperH CPU frequency driver.
\n
"
);
pr
_notice
(
"
SuperH CPU frequency driver.
\n
"
);
return
cpufreq_register_driver
(
&
sh_cpufreq_driver
);
}
...
...
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