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体验新版 GitCode,发现更多精彩内容 >>
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c7c28b0f
编写于
3月 20, 2013
作者:
M
Michal Simek
浏览文件
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差异文件
arm: zynq: Add hotplug support
Signed-off-by:
N
Michal Simek
<
michal.simek@xilinx.com
>
上级
aa7eb2bb
变更
4
隐藏空白更改
内联
并排
Showing
4 changed file
with
113 addition
and
0 deletion
+113
-0
arch/arm/mach-zynq/Makefile
arch/arm/mach-zynq/Makefile
+3
-0
arch/arm/mach-zynq/common.h
arch/arm/mach-zynq/common.h
+3
-0
arch/arm/mach-zynq/hotplug.c
arch/arm/mach-zynq/hotplug.c
+104
-0
arch/arm/mach-zynq/platsmp.c
arch/arm/mach-zynq/platsmp.c
+3
-0
未找到文件。
arch/arm/mach-zynq/Makefile
浏览文件 @
c7c28b0f
...
...
@@ -4,4 +4,7 @@
# Common support
obj-y
:=
common.o slcr.o
CFLAGS_REMOVE_hotplug.o
=
-march
=
armv6k
CFLAGS_hotplug.o
=
-Wa
,-march
=
armv7-a
-mcpu
=
cortex-a9
obj-$(CONFIG_HOTPLUG_CPU)
+=
hotplug.o
obj-$(CONFIG_SMP)
+=
headsmp.o platsmp.o
arch/arm/mach-zynq/common.h
浏览文件 @
c7c28b0f
...
...
@@ -34,4 +34,7 @@ extern struct smp_operations zynq_smp_ops __initdata;
extern
void
__iomem
*
zynq_slcr_base
;
extern
void
__iomem
*
zynq_scu_base
;
/* Hotplug */
extern
void
zynq_platform_cpu_die
(
unsigned
int
cpu
);
#endif
arch/arm/mach-zynq/hotplug.c
0 → 100644
浏览文件 @
c7c28b0f
/*
* Copyright (C) 2012-2013 Xilinx
*
* based on linux/arch/arm/mach-realview/hotplug.c
*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include "common.h"
static
inline
void
zynq_cpu_enter_lowpower
(
void
)
{
unsigned
int
v
;
flush_cache_all
();
asm
volatile
(
" mcr p15, 0, %1, c7, c5, 0
\n
"
" dsb
\n
"
/*
* Turn off coherency
*/
" mrc p15, 0, %0, c1, c0, 1
\n
"
" bic %0, %0, #0x40
\n
"
" mcr p15, 0, %0, c1, c0, 1
\n
"
" mrc p15, 0, %0, c1, c0, 0
\n
"
" bic %0, %0, %2
\n
"
" mcr p15, 0, %0, c1, c0, 0
\n
"
:
"=&r"
(
v
)
:
"r"
(
0
),
"Ir"
(
CR_C
)
:
"cc"
);
}
static
inline
void
zynq_cpu_leave_lowpower
(
void
)
{
unsigned
int
v
;
asm
volatile
(
" mrc p15, 0, %0, c1, c0, 0
\n
"
" orr %0, %0, %1
\n
"
" mcr p15, 0, %0, c1, c0, 0
\n
"
" mrc p15, 0, %0, c1, c0, 1
\n
"
" orr %0, %0, #0x40
\n
"
" mcr p15, 0, %0, c1, c0, 1
\n
"
:
"=&r"
(
v
)
:
"Ir"
(
CR_C
)
:
"cc"
);
}
static
inline
void
zynq_platform_do_lowpower
(
unsigned
int
cpu
,
int
*
spurious
)
{
/*
* there is no power-control hardware on this platform, so all
* we can do is put the core into WFI; this is safe as the calling
* code will have already disabled interrupts
*/
for
(;;)
{
dsb
();
wfi
();
/*
* Getting here, means that we have come out of WFI without
* having been woken up - this shouldn't happen
*
* Just note it happening - when we're woken, we can report
* its occurrence.
*/
(
*
spurious
)
++
;
}
}
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
void
zynq_platform_cpu_die
(
unsigned
int
cpu
)
{
int
spurious
=
0
;
/*
* we're ready for shutdown now, so do it
*/
zynq_cpu_enter_lowpower
();
zynq_platform_do_lowpower
(
cpu
,
&
spurious
);
/*
* bring this CPU back into the world of cache
* coherency, and then restore interrupts
*/
zynq_cpu_leave_lowpower
();
if
(
spurious
)
pr_warn
(
"CPU%u: %u spurious wakeup calls
\n
"
,
cpu
,
spurious
);
}
arch/arm/mach-zynq/platsmp.c
浏览文件 @
c7c28b0f
...
...
@@ -146,4 +146,7 @@ struct smp_operations zynq_smp_ops __initdata = {
.
smp_prepare_cpus
=
zynq_smp_prepare_cpus
,
.
smp_secondary_init
=
zynq_secondary_init
,
.
smp_boot_secondary
=
zynq_boot_secondary
,
#ifdef CONFIG_HOTPLUG_CPU
.
cpu_die
=
zynq_platform_cpu_die
,
#endif
};
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