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linux
linux-davinci
Commits
42a2478b
Commit
42a2478b
authored
Oct 02, 2009
by
Michal Simek
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Plain Diff
microblaze: GPIO reset support
Signed-off-by:
Michal Simek
<
monstr@monstr.eu
>
parent
f4054253
Changes
6
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6 changed files
with
171 additions
and
30 deletions
+171
-30
arch/microblaze/include/asm/setup.h
arch/microblaze/include/asm/setup.h
+2
-0
arch/microblaze/kernel/Makefile
arch/microblaze/kernel/Makefile
+1
-1
arch/microblaze/kernel/reset.c
arch/microblaze/kernel/reset.c
+138
-0
arch/microblaze/kernel/setup.c
arch/microblaze/kernel/setup.c
+0
-29
arch/microblaze/platform/generic/system.dts
arch/microblaze/platform/generic/system.dts
+28
-0
arch/microblaze/platform/platform.c
arch/microblaze/platform/platform.c
+2
-0
No files found.
arch/microblaze/include/asm/setup.h
View file @
42a2478b
...
...
@@ -35,6 +35,8 @@ extern void mmu_reset(void);
extern
void
early_console_reg_tlb_alloc
(
unsigned
int
addr
);
# endif
/* CONFIG_MMU */
extern
void
of_platform_reset_gpio_probe
(
void
);
void
time_init
(
void
);
void
init_IRQ
(
void
);
void
machine_early_init
(
const
char
*
cmdline
,
unsigned
int
ram
,
...
...
arch/microblaze/kernel/Makefile
View file @
42a2478b
...
...
@@ -7,7 +7,7 @@ extra-y := head.o vmlinux.lds
obj-y
+=
exceptions.o
\
hw_exception_handler.o init_task.o intc.o irq.o of_device.o
\
of_platform.o process.o prom.o prom_parse.o ptrace.o
\
setup.o signal.o sys_microblaze.o timer.o traps.o
setup.o signal.o sys_microblaze.o timer.o traps.o
reset.o
obj-y
+=
cpu/
...
...
arch/microblaze/kernel/reset.c
0 → 100644
View file @
42a2478b
/*
* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2009 PetaLogix
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/of_platform.h>
#include <asm/prom.h>
/* Trigger specific functions */
#ifdef CONFIG_GPIOLIB
#include <linux/of_gpio.h>
static
int
handle
;
/* reset pin handle */
static
int
of_reset_gpio_handle
(
void
)
{
int
ret
;
/* variable which stored handle reset gpio pin */
struct
device_node
*
root
;
/* root node */
struct
device_node
*
gpio
;
/* gpio node */
struct
of_gpio_chip
*
of_gc
=
NULL
;
enum
of_gpio_flags
flags
;
const
void
*
gpio_spec
;
/* find out root node */
root
=
of_find_node_by_path
(
"/"
);
/* give me handle for gpio node to be possible allocate pin */
ret
=
of_parse_phandles_with_args
(
root
,
"hard-reset-gpios"
,
"#gpio-cells"
,
0
,
&
gpio
,
&
gpio_spec
);
if
(
ret
)
{
pr_debug
(
"%s: can't parse gpios property
\n
"
,
__func__
);
goto
err0
;
}
of_gc
=
gpio
->
data
;
if
(
!
of_gc
)
{
pr_debug
(
"%s: gpio controller %s isn't registered
\n
"
,
root
->
full_name
,
gpio
->
full_name
);
ret
=
-
ENODEV
;
goto
err1
;
}
ret
=
of_gc
->
xlate
(
of_gc
,
root
,
gpio_spec
,
&
flags
);
if
(
ret
<
0
)
goto
err1
;
ret
+=
of_gc
->
gc
.
base
;
err1:
of_node_put
(
gpio
);
err0:
pr_debug
(
"%s exited with status %d
\n
"
,
__func__
,
ret
);
return
ret
;
}
void
of_platform_reset_gpio_probe
(
void
)
{
int
ret
;
handle
=
of_reset_gpio_handle
();
if
(
!
gpio_is_valid
(
handle
))
{
printk
(
KERN_INFO
"Skipping unavailable RESET gpio %d (%s)
\n
"
,
handle
,
"reset"
);
}
ret
=
gpio_request
(
handle
,
"reset"
);
if
(
ret
<
0
)
{
printk
(
KERN_INFO
"GPIO pin is already allocated
\n
"
);
return
;
}
/* get current setup value */
ret
=
gpio_get_value
(
handle
);
/* FIXME maybe worth to perform any action */
pr_debug
(
"Reset: Gpio output state: 0x%x
\n
"
,
ret
);
/* Setup GPIO as output */
ret
=
gpio_direction_output
(
handle
,
0
);
if
(
ret
<
0
)
goto
err
;
/* Setup output direction */
gpio_set_value
(
handle
,
0
);
printk
(
KERN_INFO
"Registered reset device: %d
\n
"
,
handle
);
return
;
err:
gpio_free
(
handle
);
return
;
}
static
void
gpio_system_reset
(
void
)
{
gpio_set_value
(
handle
,
1
);
}
#else
#define gpio_system_reset() do {} while (0)
void
of_platform_reset_gpio_probe
(
void
)
{
return
;
}
#endif
void
machine_restart
(
char
*
cmd
)
{
printk
(
KERN_NOTICE
"Machine restart...
\n
"
);
gpio_system_reset
();
dump_stack
();
while
(
1
)
;
}
void
machine_shutdown
(
void
)
{
printk
(
KERN_NOTICE
"Machine shutdown...
\n
"
);
while
(
1
)
;
}
void
machine_halt
(
void
)
{
printk
(
KERN_NOTICE
"Machine halt...
\n
"
);
while
(
1
)
;
}
void
machine_power_off
(
void
)
{
printk
(
KERN_NOTICE
"Machine power off...
\n
"
);
while
(
1
)
;
}
arch/microblaze/kernel/setup.c
View file @
42a2478b
...
...
@@ -186,32 +186,3 @@ static int microblaze_debugfs_init(void)
}
arch_initcall
(
microblaze_debugfs_init
);
#endif
void
machine_restart
(
char
*
cmd
)
{
printk
(
KERN_NOTICE
"Machine restart...
\n
"
);
dump_stack
();
while
(
1
)
;
}
void
machine_shutdown
(
void
)
{
printk
(
KERN_NOTICE
"Machine shutdown...
\n
"
);
while
(
1
)
;
}
void
machine_halt
(
void
)
{
printk
(
KERN_NOTICE
"Machine halt...
\n
"
);
while
(
1
)
;
}
void
machine_power_off
(
void
)
{
printk
(
KERN_NOTICE
"Machine power off...
\n
"
);
while
(
1
)
;
}
arch/microblaze/platform/generic/system.dts
View file @
42a2478b
...
...
@@ -32,6 +32,7 @@
#
address
-
cells
=
<
1
>;
#
size
-
cells
=
<
1
>;
compatible
=
"xlnx,microblaze"
;
hard
-
reset
-
gpios
=
<&
LEDs_8Bit
2
1
>;
model
=
"testing"
;
DDR2_SDRAM
:
memory
@
90000000
{
device_type
=
"memory"
;
...
...
@@ -261,6 +262,33 @@
xlnx
,
is
-
dual
=
<
0x0
>;
xlnx
,
tri
-
default
=
<
0xffffffff
>;
xlnx
,
tri
-
default
-
2
=
<
0xffffffff
>;
#
gpio
-
cells
=
<
2
>;
gpio
-
controller
;
}
;
gpio
-
leds
{
compatible
=
"gpio-leds"
;
heartbeat
{
label
=
"Heartbeat"
;
gpios
=
<&
LEDs_8Bit
4
1
>;
linux
,
default
-
trigger
=
"heartbeat"
;
};
yellow
{
label
=
"Yellow"
;
gpios
=
<&
LEDs_8Bit
5
1
>;
};
red
{
label
=
"Red"
;
gpios
=
<&
LEDs_8Bit
6
1
>;
};
green
{
label
=
"Green"
;
gpios
=
<&
LEDs_8Bit
7
1
>;
};
}
;
RS232_Uart_1
:
serial
@
84000000
{
clock
-
frequency
=
<
125000000
>;
...
...
arch/microblaze/platform/platform.c
View file @
42a2478b
...
...
@@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/of_platform.h>
#include <asm/prom.h>
#include <asm/setup.h>
static
struct
of_device_id
xilinx_of_bus_ids
[]
__initdata
=
{
{
.
compatible
=
"simple-bus"
,
},
...
...
@@ -26,6 +27,7 @@ static struct of_device_id xilinx_of_bus_ids[] __initdata = {
static
int
__init
microblaze_device_probe
(
void
)
{
of_platform_bus_probe
(
NULL
,
xilinx_of_bus_ids
,
NULL
);
of_platform_reset_gpio_probe
();
return
0
;
}
device_initcall
(
microblaze_device_probe
);
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