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Elphel
linux-elphel
Commits
ec722b00
Commit
ec722b00
authored
May 01, 2015
by
YuriNenakhov
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DMA support initial
parent
0082c20c
Changes
3
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3 changed files
with
158 additions
and
15 deletions
+158
-15
Kconfig
src/drivers/elphel/Kconfig
+16
-10
Makefile
src/drivers/elphel/Makefile
+7
-5
elphel393-mem.c
src/drivers/elphel/elphel393-mem.c
+135
-0
No files found.
src/drivers/elphel/Kconfig
View file @
ec722b00
#
# Elphel devices
#
#
# Elphel devices
#
menu "Elphel devices"
config ELPHEL393
tristate "Support Elphel 10393 board voltage regulator"
# add more
# depends on I2C && SYSFS
help
Say Y here if you have a Elphel board 10393.
endmenu
tristate "Support Elphel 10393 board voltage regulator, DMA memory allocator"
# add more
# depends on I2C && SYSFS
help
Say Y here if you have a Elphel board 10393.
config ELPHELDRVONMICROZED
tristate "Provide only Elphel features which are compatible with Microzed"
help
Say Y here if you debug Elpel camera code on Microzed board.
endmenu
src/drivers/elphel/Makefile
View file @
ec722b00
#
# Makefile for Elphel specific devices.
#
obj-$(CONFIG_ELPHEL393)
+=
elphel393-pwr.o
#
# Makefile for Elphel specific devices.
#
obj-$(CONFIG_ELPHEL393)
+=
elphel393-pwr.o
obj-$(CONFIG_ELPHEL393)
+=
elphel393-mem.o
obj-$(CONFIG_ELPHELDRVONMICROZED)
+=
elphel393-mem.o
src/drivers/elphel/elphel393-mem.c
0 → 100644
View file @
ec722b00
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/kernel.h>
#include <linux/bootmem.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direction.h>
#include <asm/dma-mapping.h>
#define SYSFS_PERMISSIONS 0644
/* default permissions for sysfs files */
#define SYSFS_READONLY 0444
static
ssize_t
get_paddr
(
struct
device
*
dev
,
struct
device_attribute
*
attr
,
char
*
buf
);
struct
elphel_buf_t
{
void
*
vaddr
;
dma_addr_t
paddr
;
ssize_t
size
;
};
static
struct
elphel_buf_t
elphel_buf
=
{
.
vaddr
=
NULL
,
.
paddr
=
0
,
.
size
=
0
};
static
int
__init
elphelmem_init
(
void
)
{
struct
device_node
*
node
;
const
__be32
*
bufsize_be
;
printk
(
"======== Allocating memory buffer ========
\n
"
);
node
=
of_find_node_by_name
(
NULL
,
"elphel393-mem"
);
if
(
!
node
)
{
printk
(
"ERROR: No node found
\n
"
);
return
-
ENODEV
;
}
bufsize_be
=
(
__be32
*
)
of_get_property
(
node
,
"memsize"
,
NULL
);
elphel_buf
.
size
=
be32_to_cpup
(
bufsize_be
);
elphel_buf
.
vaddr
=
dma_alloc_coherent
(
NULL
,(
elphel_buf
.
size
*
PAGE_SIZE
),
&
(
elphel_buf
.
paddr
),
GFP_KERNEL
);
if
(
elphel_buf
.
paddr
)
{
printk
(
"Allocated %u pages at address %x
\n
"
,
(
u32
)
elphel_buf
.
size
,
(
u32
)
elphel_buf
.
paddr
);
}
else
printk
(
"ERROR allocating memory buffer"
);
return
0
;
}
static
void
__exit
elphelmem_exit
(
void
)
{
printk
(
"Goodbye Cruel World!
\n
"
);
}
// SYSFS
static
ssize_t
get_paddr
(
struct
device
*
dev
,
struct
device_attribute
*
attr
,
char
*
buf
)
{
return
sprintf
(
buf
,
"%x
\n
"
,
(
u32
)
elphel_buf
.
paddr
);
}
static
ssize_t
get_size
(
struct
device
*
dev
,
struct
device_attribute
*
attr
,
char
*
buf
)
{
return
sprintf
(
buf
,
"%u
\n
"
,
elphel_buf
.
size
);
}
static
DEVICE_ATTR
(
buffer_address
,
SYSFS_PERMISSIONS
&
SYSFS_READONLY
,
get_paddr
,
NULL
);
static
DEVICE_ATTR
(
buffer_pages
,
SYSFS_PERMISSIONS
&
SYSFS_READONLY
,
get_size
,
NULL
);
static
struct
attribute
*
root_dev_attrs
[]
=
{
&
dev_attr_buffer_address
.
attr
,
&
dev_attr_buffer_pages
.
attr
,
NULL
};
static
const
struct
attribute_group
dev_attr_root_group
=
{
.
attrs
=
root_dev_attrs
,
.
name
=
NULL
,
};
static
int
elphel393_mem_sysfs_register
(
struct
platform_device
*
pdev
)
{
int
retval
=
0
;
struct
device
*
dev
=
&
pdev
->
dev
;
if
(
&
dev
->
kobj
)
{
if
(((
retval
=
sysfs_create_group
(
&
dev
->
kobj
,
&
dev_attr_root_group
)))
<
0
)
return
retval
;
}
return
retval
;
}
static
int
elphel393_mem_probe
(
struct
platform_device
*
pdev
)
{
elphel393_mem_sysfs_register
(
pdev
);
dev_info
(
&
pdev
->
dev
,
"Probing elphel393-mem
\n
"
);
return
0
;
}
static
int
elphel393_mem_remove
(
struct
platform_device
*
pdev
)
{
dev_info
(
&
pdev
->
dev
,
"Removing elphel393-mem"
);
return
0
;
}
static
struct
of_device_id
elphel393_mem_of_match
[]
=
{
{
.
compatible
=
"elphel,elphel393-mem-1.00"
,
},
{
/* end of table */
}
};
MODULE_DEVICE_TABLE
(
of
,
elphel393_pwr_of_match
);
static
struct
platform_driver
elphel393_mem
=
{
.
probe
=
elphel393_mem_probe
,
.
remove
=
elphel393_mem_remove
,
.
driver
=
{
.
name
=
"elphel393-mem"
,
.
owner
=
THIS_MODULE
,
.
of_match_table
=
elphel393_mem_of_match
,
.
pm
=
NULL
,
/* power management */
},
};
module_platform_driver
(
elphel393_mem
);
module_init
(
elphelmem_init
);
module_exit
(
elphelmem_exit
);
MODULE_LICENSE
(
"GPL"
);
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