Commit graph

26 commits

Author SHA1 Message Date
Lucas De Marchi
25985edced Fix common misspellings
Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 11:26:23 -03:00
Vasiliy Kulikov
fef52b0171 net: can: at91_can: world-writable sysfs files
Don't allow everybody to write to mb0_id file.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-04 13:06:27 -08:00
Marc Kleine-Budde
3a5655a5b5 can: at91_can: make can_id of mailbox 0 configurable
Due to a chip bug (errata 50.2.6.3 & 50.3.5.3 in
"AT91SAM9263 Preliminary 6249H-ATARM-27-Jul-09") the contents of mailbox
0 may be send under certain conditions (even if disabled or in rx mode).

The workaround in the errata suggests not to use the mailbox and load it
with an unused identifier.

This patch implements the second part of the workaround. A sysfs entry
"mb0_id" is introduced. While the interface is down it can be used to
configure the can_id of mailbox 0. The default value id 0x7ff.

In order to use an extended can_id add the CAN_EFF_FLAG (0x80000000U)
to the can_id. Example:

- standard id 0x7ff:
echo 0x7ff      > /sys/class/net/can0/mb0_id

- extended id 0x1fffffff:
echo 0x9fffffff > /sys/class/net/can0/mb0_id

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
For the Documentation-part:
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
2011-01-24 14:56:37 +01:00
Marc Kleine-Budde
9e0a2d1ca3 can: at91_can: don't use mailbox 0
Due to a chip bug (errata 50.2.6.3 & 50.3.5.3 in
"AT91SAM9263 Preliminary 6249H-ATARM-27-Jul-09") the contents of mailbox
0 may be send under certain conditions (even if disabled or in rx mode).

The workaround in the errata suggests not to use the mailbox and load it
with a unused identifier.

This patch implements the first part of the workaround, it updates
AT91_MB_RX_NUM and AT91_MB_RX_FIRST (and the inline documentation)
so that mailbox 0 stays unused.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
2011-01-24 13:24:30 +01:00
Marc Kleine-Budde
0909c1ec6f can: at91_can: clean up usage of AT91_MB_RX_FIRST and AT91_MB_RX_NUM
This patch cleans up the usage of two macros which specify the mailbox
usage. AT91_MB_RX_FIRST and AT91_MB_RX_NUM define the first and the
number of RX mailboxes. The current driver uses these variables in an
unclean way; assuming that AT91_MB_RX_FIRST is 0;

This patch cleans up the usage of these macros, no longer assuming
AT91_MB_RX_FIRST == 0.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
2011-01-24 13:22:02 +01:00
Hans J. Koch
3e9ebd3cf4 netdev: can: Change mail address of Hans J. Koch
My old mail address doesn't exist anymore. This changes all occurrences
to my new address.

Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-30 16:49:38 -07:00
Marc Kleine-Budde
00389b0820 can: at91_can: add KBUILD_MODNAME to bittiming constant
While there replace all usage of self defined DRV_NAME by KBUILD_MODNAME.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:52 -07:00
Marc Kleine-Budde
882055c838 can: at91_can: convert dev_<level> printing to netdev_<level>
While there, remove "printk()" on driver loading.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:51 -07:00
Marc Kleine-Budde
7672fe7373 can: at91_can: convert readl, writel their __raw pendants
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:51 -07:00
Marc Kleine-Budde
b156fd0483 can: at91_can: set bittiming in chip_start
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:50 -07:00
Marc Kleine-Budde
33a6f298c2 can: at91_can: implement and use at91_get_berr_counter
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:50 -07:00
Marc Kleine-Budde
a9d992ecb3 can: at91_can: fix section mismatch warning
...by adding the correct annotation "__devinit" to the driver's probe
function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:49 -07:00
Marc Kleine-Budde
b61f674051 can: at91_can: fix compiler warning in at91_irq_err_state
This patch fixes the following compiler warning:

drivers/net/can/at91_can.c: In function 'at91_irq_err_state':
drivers/net/can/at91_can.c:779: warning: 'reg_ier' may be used uninitialized in this function
drivers/net/can/at91_can.c:779: warning: 'reg_idr' may be used uninitialized in this function

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:49 -07:00
Marc Kleine-Budde
759a6c768d can: at91_can: fix use after free of priv
The priv is part of the memory allocated by alloc_candev().
This patch moved the free it after last usage of priv.

While there convert all free_netdev() to free_candev() (which is currently
just a wrapper around free_netdev()) to be symetrically with the allocation
via alloc_candev().

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:48 -07:00
Marc Kleine-Budde
8a0e0a49b0 can: at91_can: fix reception of extended frames
The AT91_MID_MIDE bit must be set in order to receive extended frames.
The reception of an extended frame sets this bit, while reception of
standard frames resets it. This results in some lost extended frames in
an extended ID only environment. But leads to unpredictable lost
extended ID frames in a mixed environment.

The problem is fixed by setting the AT91_MID_MIDE after reception of a
CAN frame.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:48 -07:00
Marc Kleine-Budde
dbe91325c2 can: at91_can: use correct bit to enable CAN_CTRLMODE_3_SAMPLES
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-24 14:47:47 -07:00
Eric Dumazet
1ae5dc342a net: trans_start cleanups
Now that core network takes care of trans_start updates, dont do it
in drivers themselves, if possible. Drivers can avoid one cache miss
(on dev->trans_start) in their start_xmit() handler.

Exceptions are NETIF_F_LLTX drivers

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-10 05:01:31 -07:00
Eric Dumazet
127aa0e14b drivers: net: last_rx elimination
Network drivers do not have to update last_rx, unless they need it for
their private use.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-13 03:32:43 -07:00
Hans J. Koch
829e001543 Fix some #includes in CAN drivers (rebased for net-next-2.6)
In the current implementation, CAN drivers need to #include <linux/can.h>
_before_ they #include <linux/can/dev.h>, which is both ugly and
unnecessary.

Fix this by including <linux/can.h> in <linux/can/dev.h> and remove the
#include <linux/can.h> lines from drivers.

Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-13 03:32:42 -07:00
Christian Pellegrin
ad72c347e5 can: Proper ctrlmode handling for CAN devices
This patch adds error checking of ctrlmode values for CAN devices. As
an example all availabe bits are implemented in the mcp251x driver.

Signed-off-by: Christian Pellegrin <chripell@fsfe.org>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-15 01:39:17 -08:00
Oliver Hartkopp
3ccd4c6167 can: Unify droping of invalid tx skbs and netdev stats
To prevent the CAN drivers to operate on invalid socketbuffers the skbs are
now checked and silently dropped at the xmit-function consistently.

Also the netdev stats are consistently using the CAN data length code (dlc)
for [rx|tx]_bytes now.

Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-12 02:00:46 -08:00
Uwe Kleine-König
4773a47d8a can/at91: don't check platform_get_irq's return value against zero
platform_get_irq returns -ENXIO on failure, so !irq was probably
always true.  Better use (int)irq <= 0.  Note that a return value of
zero is still handled as error even though this could mean irq0.

This is a followup to 305b3228f9 that
changed the return value of platform_get_irq from 0 to -ENXIO on error.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-18 20:31:56 -08:00
Oliver Hartkopp
c7cd606f60 can: Fix data length code handling in rx path
A valid CAN dataframe can have a data length code (DLC) of 0 .. 8 data bytes.

When reading the CAN controllers register the 4-bit value may contain values
from 0 .. 15 which may exceed the reserved space in the socket buffer!

The ISO 11898-1 Chapter 8.4.2.3 (DLC field) says that register values > 8
should be reduced to 8 without any error reporting or frame drop.

This patch introduces a new helper macro to cast a given 4-bit data length
code (dlc) to __u8 and ensure the DLC value to be max. 8 bytes.

The different handlings in the rx path of the CAN netdevice drivers are fixed.

Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-13 19:47:42 -08:00
Wolfgang Grandegger
7b6856a029 can: provide library functions for skb allocation
This patch makes the private functions alloc_can_skb() and
alloc_can_err_skb() of the at91_can driver public and adapts all
drivers to use these. While making the patch I realized, that
the skb's are *not* setup consistently. It's now done as shown
below:

  skb->protocol = htons(ETH_P_CAN);
  skb->pkt_type = PACKET_BROADCAST;
  skb->ip_summed = CHECKSUM_UNNECESSARY;
  *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
  memset(*cf, 0, sizeof(struct can_frame));

The frame is zeroed out to avoid uninitialized data to be passed to
user space. Some drivers or library code did not set "pkt_type" or
"ip_summed". Also,  "__constant_htons()" should not be used for
runtime invocations, as pointed out by David Miller.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-20 00:08:01 -07:00
Wolfgang Grandegger
a6e4bc5304 can: make the number of echo skb's configurable
This patch allows the CAN controller driver to define the number of echo
skb's used for the local loopback (echo), as suggested by Kurt Van
Dijck, with the function:

  struct net_device *alloc_candev(int sizeof_priv,
                                  unsigned int echo_skb_max);

The CAN drivers have been adapted accordingly. For the ems_usb driver,
as suggested by Sebastian Haas, the number of echo skb's has been
increased to 10, which improves the transmission performance a lot.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-13 03:44:04 -07:00
David S. Miller
99c4a6344f at91_can: Forgotten git 'add' of at91_can.c
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-25 13:43:54 -07:00