07 Apr, 2009
40 commits
-
Replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64)
Signed-off-by: Yang Hongyang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make romfs return f_fsid info for statfs(2).
Signed-off-by: Coly Li
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Largely inspired from ipc/ipc_sysctl.c. This patch isolates the mqueue
sysctl stuff in its own file.[akpm@linux-foundation.org: build fix]
Signed-off-by: Cedric Le Goater
Signed-off-by: Nadia Derbey
Signed-off-by: Serge E. Hallyn
Cc: Alexey Dobriyan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Implement multiple mounts of the mqueue file system, and link it to usage
of CLONE_NEWIPC.Each ipc ns has a corresponding mqueuefs superblock. When a user does
clone(CLONE_NEWIPC) or unshare(CLONE_NEWIPC), the unshare will cause an
internal mount of a new mqueuefs sb linked to the new ipc ns.When a user does 'mount -t mqueue mqueue /dev/mqueue', he mounts the
mqueuefs superblock.Posix message queues can be worked with both through the mq_* system calls
(see mq_overview(7)), and through the VFS through the mqueue mount. Any
usage of mq_open() and friends will work with the acting task's ipc
namespace. Any actions through the VFS will work with the mqueuefs in
which the file was created. So if a user doesn't remount mqueuefs after
unshare(CLONE_NEWIPC), mq_open("/ab") will not be reflected in "ls
/dev/mqueue".If task a mounts mqueue for ipc_ns:1, then clones task b with a new ipcns,
ipcns:2, and then task a is the last task in ipc_ns:1 to exit, then (1)
ipc_ns:1 will be freed, (2) it's superblock will live on until task b
umounts the corresponding mqueuefs, and vfs actions will continue to
succeed, but (3) sb->s_fs_info will be NULL for the sb corresponding to
the deceased ipc_ns:1.To make this happen, we must protect the ipc reference count when
a) a task exits and drops its ipcns->count, since it might be dropping
it to 0 and freeing the ipcnsb) a task accesses the ipcns through its mqueuefs interface, since it
bumps the ipcns refcount and might race with the last task in the ipcns
exiting.So the kref is changed to an atomic_t so we can use
atomic_dec_and_lock(&ns->count,mq_lock), and every access to the ipcns
through ns = mqueuefs_sb->s_fs_info is protected by the same lock.Signed-off-by: Cedric Le Goater
Signed-off-by: Serge E. Hallyn
Cc: Alexey Dobriyan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Move mqueue vfsmount plus a few tunables into the ipc_namespace struct.
The CONFIG_IPC_NS boolean and the ipc_namespace struct will serve both the
posix message queue namespaces and the SYSV ipc namespaces.The sysctl code will be fixed separately in patch 3. After just this
patch, making a change to posix mqueue tunables always changes the values
in the initial ipc namespace.Signed-off-by: Cedric Le Goater
Signed-off-by: Serge E. Hallyn
Cc: Alexey Dobriyan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The mqueuefs filesystem will use this helper as well. Proc's main get_sb
could also be made to use it, but that will require a bit more rework.Signed-off-by: Serge E. Hallyn
Cc: Cedric Le Goater
Cc: Alexey Dobriyan
Cc: "David S. Miller"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Update the uvesafb documentation to accurately reflect the default options
used by the driver.Signed-off-by: Michal Januszewski
Cc: Krzysztof Helt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
1. check for errors returned from clk_get()
2. fix "Unbalanced enable for IRQ 160"
3. fix transmit descriptor handling in panning
4. clean frame buffer on blank - useful for OLED displays
5. formatting clean upSigned-off-by: Guennadi Liakhovetski
Cc: Dan Williams
Cc: Sascha Hauer
Cc: Krzysztof Helt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Read DDC information from a connected monitor and use it to select initial
mode (if the mode is not specified).Also, use the information to protect against modes outside the monitor
specs.Signed-off-by: Krzysztof Helt
Tested-by: Jean Delvare
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The I2C functionality provided by the i2c-voodoo3 driver is moved into the
tdfxfb (frame buffer driver for Voodoo3 cards). This way there is no
conflict between the i2c driver and the fb driver.The tdfxfb does not make use from the DDC functionality yet but provides
all the functionality of the i2c-voodoo3 driver.Signed-off-by: Krzysztof Helt
Acked-by: Jean Delvare
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add disable/enable_kretprobe() and disable/enable_jprobe().
Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add disable_kprobe() and enable_kprobe() to disable/enable kprobes
temporarily.disable_kprobe() asynchronously disables probe handlers of specified
kprobe. So, after calling it, some handlers can be called at a while.
enable_kprobe() enables specified kprobe.aggr_pre_handler and aggr_post_handler check disabled probes. On the
other hand aggr_break_handler and aggr_fault_handler don't check it
because these handlers will be called while executing pre or post handlers
and usually those help error handling.Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Rename kprobe_enabled to kprobes_all_disarmed and invert logic due to
avoiding naming confusion from per-probe disabling.Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix comment style in kprobes.h.
Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Clean up positions of EXPORT_SYMBOL_GPL in kernel/kprobes.c according to
checkpatch.pl.Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, kprobes can disable all probes at once, but can't disable it
individually (not unregister, just disable an kprobe, because
unregistering needs to wait for scheduler synchronization). These patches
introduce APIs for on-the-fly per-probe disabling and re-enabling by
dis-arming/re-arming its breakpoint instruction.This patch:
Change old_p to ap in add_new_kprobe() for readability, copy flags member
in add_aggr_kprobe(), and simplify the code flow of
register_aggr_kprobe().Signed-off-by: Masami Hiramatsu
Acked-by: Ananth N Mavinakayanahalli
Cc: Anil S Keshavamurthy
Cc: David S. Miller
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Mike Rapoport
Cc: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Mike Rapoport
Cc: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Some SPI controllers have restrictions on DMAable buffers alignemt.
Currently if the buffer supplied by protocol driver is not properly
aligned, the controller silently performs transfer in PIO mode. Addition
of dma_alignment field to spi_master allows protocol drivers to perform
proper alignment.Signed-off-by: Mike Rapoport
Cc: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Mike Rapoport
Cc: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Most SPI peripherals use GPIOs as their chip selects, introduce .gpio_cs
for this.Signed-off-by: Eric Miao
Cc: David Brownell
Cc: Russell King
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
With a postfix decrement limit will reach -1 rather than 0, so the warning
will not be issued.Also, add a cpu_relax() into the busy-wait loop.
Signed-off-by: Roel Kluin
Cc: Mariusz Ceier
Acked-by: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
1. Rewrite of the non-dma data transfer functions to use only ONE mode
of TIMOD (TIMOD=0x1). With TIMOD=0, it was not possible to set the TX
bit pattern. So the TDBR = 0xFFFF inside the read calls won't work.2. Clear SPI_RDBR before reading and before duplex transfer.
Otherwise the garbage data in RDBR will get read. Since mmc_spi uses a
lot of duplex transfers, this is the main cause of mmc_spi failure.3. Poll RXS for transfer completion. Polling SPIF or TXS cannot
guarantee transfer completion. This may interrupt a transfer before it
is finished. Also this may leave garbage data in buffer and affect
next transfer.[Yi Li : add a field "u16 idle_tx_val" in "struct
bfin5xx_spi_chip" to specify the value to transmit if no TX value
is supplied.]
Signed-off-by: Wolfgang Muees
Signed-off-by: Yi Li
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add support for GPIO controlled SPI Chip Selects. To make use of this
feature, set chip_select = 0 and add a proper cs_gpio to your
controller_data.struct spi_board_info
.chip_select = 0struct bfin5xx_spi_chip
.cs_gpio = GPIO_P###There are various SPI devices that require SPI MODE_0, and need to have
the Chip Selects asserted during the entire transfer. Consider using
SPI_MODE_3 (SPI_CPHA | SPI_CPOL) if your device allows it.Signed-off-by: Michael Hennerich
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix NULL pointer crash when cleaning up from invalid platform resources
Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Do this because when things crash, we get simple names like "setup" and
"start_queue" which is pretty difficult to trace back to the real thing:
the spi driverSigned-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
According to comments in linux/spi/spi.h:
* All SPI transfers start with the relevant chipselect active. Normally
* it stays selected until after the last transfer in a message. Drivers
* can affect the chipselect signal using cs_change.
*
* (i) If the transfer isn't the last one in the message, this flag is
* used to make the chipselect briefly go inactive in the middle of the
* message. Toggling chipselect in this way may be needed to terminate
* a chip command, letting a single spi_message perform all of group of
* chip transactions together.
*
* (ii) When the transfer is the last one in the message, the chip may
* stay selected until the next transfer. On multi-device SPI busses
* with nothing blocking messages going to other devices, this is just
* a performance hint; starting a message to another device deselects
* this one. But in other cases, this can be used to ensure correctness.
* Some devices need protocol transactions to be built from a series of
* spi_message submissions, where the content of one message is determined
* by the results of previous messages and where the whole transaction
* ends when the chipselect goes intactive.Signed-off-by: Yi Li
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This bug can be observed when two SPI devices are sharing the spi bus: One
device is set as SPI CS 7, another one is using SPI CS 4.In spi_bfin5xx.c: cs_active(), cs_deactive() are used to control SPI_FLG
register. From the debug bellow:cs_active: flag: 0x7f91, chip->flag: 0x7f80, cs: 7
cs_active: flag: 0xef91, chip->flag: 0xef10, cs: 4When device A (cs_7) activate CS 7, SPI_FLG is set as 0x7f91 (however,
SPI_FLG should be set as 0x7f80, or 0x6f91 if in broadcast mode).Due to some HW bug (very possibly), if SPI_FLG is set as 0x7f91, SPISSEL7
is asserted, however SPISSEL4 will be asserted too (I can see this using
the scope). This is unreasonable according to HRM.Signed-off-by: Yi Li
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Without this change, SPI DMA is not reliably under stress tests.
Obiviously it's a hardware issue which is not addressed by any document.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The "while" endless loop will cause the system hang if hardware error, so
we add timeout control to make the system alive.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When using a BF533-STAMP here with a W25X10 SPI flash. It works fine when
enable_dma is disabled, but doesn't work at all when turning DMA on. We
get just 0xff bytes back when trying to read the device.Change the code around so that it programs the SPI first and then enables
DMA, it seems to work a lot better ...Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- remove duplicated definition MAX_SPI_SSEL
- remove unnecessary array size
Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
use the properl BIT_CTL_... defines rather than the internal driv er
CFG_SPI_... definesSigned-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We only need to check SPI error when DMA failes, cause that is the DMA IRQ
handling routine.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Because of DMA hardware issue, we were trying to use software workaround.
This patch add some useful debug messages to help us debugging the DMA
code.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Blackfin's related DMA callback API doesn't need void * cast, so drop it.
And this driver is for all Blackfin processors not only for BF53x, we
update the DMA request label for more meaningful information.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
For DMA TX/RX operation in pump_transfers, DMA contriguration code in TX
and RX paths are almost the same. This patch unify the duplicated DMA
code to make it more readable.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If the SPI bus registers a receive overflow error, pass the result back up
to the higher levels.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use len_in_bytes when we care about the number of bytes transferred rather
than the number of spi transactions. (this value will be the same for
8bit transfers, but not any other sizes)Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We already moved bfin_addr_dcachable() and friends into the cacheflush
header where it belongs, so don't need to include here.Signed-off-by: Mike Frysinger
Signed-off-by: Bryan Wu
Acked-by: David Brownell
Cc: David Brownell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
