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FMC Bus
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b25c0a9b
Commit
b25c0a9b
authored
Jul 24, 2012
by
Alessandro Rubini
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new module fmc-write-eeprom (no tlv yet)
parent
6100b0cd
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fmc-write-eeprom.c
kernel/fmc-write-eeprom.c
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kernel/fmc-write-eeprom.c
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b25c0a9b
/*
* Copyright (C) 2012 CERN (www.cern.ch)
* Author: Alessandro Rubini <rubini@gnudd.com>
*
* Released according to the GNU GPL, version 2 or any later version.
*
* This work is part of the White Rabbit project, a research effort led
* by CERN, the European Institute for Nuclear Research.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/firmware.h>
#include <linux/init.h>
#include <linux/fmc.h>
/*
* This module uses the firmware loader to program the whole or part
* of the FMC eeprom. The meat is in the _run functions. However, no
* default file name is provided, to avoid accidental mishaps.
*/
static
char
*
fwe_file
;
module_param_named
(
file
,
fwe_file
,
charp
,
444
);
static
int
fwe_run_tlv
(
struct
fmc_device
*
fmc
,
const
struct
firmware
*
fw
)
{
dev_err
(
fmc
->
hwdev
,
"not implemented yet
\n
"
);
return
-
EOPNOTSUPP
;
}
static
int
fwe_run_bin
(
struct
fmc_device
*
fmc
,
const
struct
firmware
*
fw
)
{
int
ret
;
dev_info
(
fmc
->
hwdev
,
"programming %i bytes
\n
"
,
fw
->
size
);
ret
=
fmc
->
op
->
write_ee
(
fmc
,
0
,
(
void
*
)
fw
->
data
,
fw
->
size
);
if
(
ret
<
0
)
{
dev_info
(
fmc
->
hwdev
,
"write_eeprom: error %i
\n
"
,
ret
);
return
ret
;
}
return
0
;
}
static
int
fwe_run
(
struct
fmc_device
*
fmc
,
const
struct
firmware
*
fw
)
{
char
*
last4
=
fwe_file
+
strlen
(
fwe_file
)
-
4
;
if
(
!
strcmp
(
last4
,
".tlv"
))
return
fwe_run_tlv
(
fmc
,
fw
);
if
(
!
strcmp
(
last4
,
".bin"
))
return
fwe_run_bin
(
fmc
,
fw
);
dev_err
(
fmc
->
hwdev
,
"invalid file name
\"
%s
\"\n
"
,
fwe_file
);
return
-
EINVAL
;
}
/*
* Programming is done at probe time. Morever, if more than one FMC
* card is probed for, only one is programmed. Unfortunately, it's
* difficult to know in advance when probing the first card if others
* are there.
*/
int
fwe_probe
(
struct
fmc_device
*
fmc
)
{
int
err
;
static
int
done
;
const
struct
firmware
*
fw
;
struct
device
*
dev
=
fmc
->
hwdev
;
if
(
!
fwe_file
)
{
dev_err
(
dev
,
"%s: no filename given: not programming
\n
"
,
KBUILD_MODNAME
);
return
-
ENOENT
;
}
if
(
done
)
{
dev_err
(
dev
,
"%s: refusing to program another card
\n
"
,
KBUILD_MODNAME
);
return
-
EAGAIN
;
}
done
++
;
/* we are starting with this board, don't do any more */
err
=
request_firmware
(
&
fw
,
fwe_file
,
dev
);
if
(
err
<
0
)
{
dev_err
(
dev
,
"request firmware
\"
%s
\"
: error %i
\n
"
,
fwe_file
,
err
);
return
err
;
}
fwe_run
(
fmc
,
fw
);
release_firmware
(
fw
);
return
0
;
}
int
fwe_remove
(
struct
fmc_device
*
fmc
)
{
return
0
;
}
static
struct
fmc_driver
fwe_drv
=
{
.
driver
.
name
=
KBUILD_MODNAME
,
.
probe
=
fwe_probe
,
.
remove
=
fwe_remove
,
/* no table, as the current match just matches everything */
};
static
int
fwe_init
(
void
)
{
int
ret
;
ret
=
fmc_driver_register
(
&
fwe_drv
);
return
ret
;
}
static
void
fwe_exit
(
void
)
{
fmc_driver_unregister
(
&
fwe_drv
);
}
module_init
(
fwe_init
);
module_exit
(
fwe_exit
);
MODULE_LICENSE
(
"GPL"
);
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