Commit Graph

8 Commits

Author SHA1 Message Date
Linus Torvalds
d3d0b02434 Merge branch 'amba-modalias' of git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm
* 'amba-modalias' of git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm:
  sound: aaci: Enable module alias autogeneration for AMBA drivers
  watchdog: sp805: Enable module alias autogeneration for AMBA drivers
  fbdev: amba: Enable module alias autogeneration for AMBA drivers
  serial: pl011: Enable module alias autogeneration for AMBA drivers
  serial: pl010: Enable module alias autogeneration for AMBA drivers
  spi: pl022: Enable module alias autogeneration for AMBA drivers
  rtc: pl031: Enable module alias autogeneration for AMBA drivers
  rtc: pl030: Enable module alias autogeneration for AMBA drivers
  mmc: mmci: Enable module alias autogeneration for AMBA drivers
  input: ambakmi: Enable module alias autogeneration for AMBA drivers
  gpio: pl061: Enable module alias autogeneration for AMBA drivers
  dmaengine: pl330: Enable module alias autogeneration for AMBA drivers
  dmaengine: pl08x: Enable module alias autogeneration for AMBA drivers
  hwrng: nomadik: Enable module alias autogeneration for AMBA drivers
  ARM: amba: Auto-generate AMBA driver module aliases during modpost
  ARM: amba: Move definition of struct amba_id to mod_devicetable.h
2012-01-06 18:03:30 -08:00
Nick Bowler
bb558dac67 watchdog: sp805: Fix section mismatch in ID table.
The AMBA ID table is marked as __initdata, yet it is referenced by the
driver struct which is not.  This causes a (somewhat unhelpful) section
mismatch warning:

  WARNING: drivers/watchdog/sp805_wdt.o(.data+0x4c): Section mismatch in
           reference from the variable sp805_wdt_driver to the (unknown
           reference) .init.data:(unknown)

Fix this by removing the annotation.

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-12-26 15:14:31 +01:00
Dave Martin
17885b05b3 watchdog: sp805: Enable module alias autogeneration for AMBA drivers
Signed-off-by: Dave Martin <dave.martin@linaro.org>
2011-11-22 10:58:33 +00:00
Nick Bowler
081d83a339 watchdog: sp805: Flush posted writes in enable/disable.
There are no reads in these functions, so if MMIO writes are posted,
the writes in enable/disable may not have completed by the time these
functions return.  If the functions run from different CPUs, it's
in theory possible for the writes to be interleaved, which would be
disastrous for this driver.

At the very least, we need an mmiowb() before releasing the lock, but
since it seems desirable for the watchdog timer to be actually stopped
or reset when these functions return, read the lock register to force
the writes out.

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-26 21:19:56 +00:00
Nick Bowler
da3e515024 watchdog: sp805: Don't write 0 to the load value register.
At least on the Versatile Express' V2M, calling wdt_disable followed by
wdt_enable, for instance by running the following sequence:

  echo V > /dev/watchdog; echo V > /dev/watchdog

results in an immediate reset.  The wdt_disable function writes 0 to the
load register; while the watchdog interrupts are disabled at this point,
this special value is defined to trigger an interrupt immediately.  It
appears that in this instance, the reset happens when the interrupts
are subsequently enabled by wdt_enable.

Putting in a short delay after writing a new load value in wdt_enable
solves the issue, but it seems cleaner to simply never write 0 to the
load register at all: according to the hardware docs, writing 0 to the
control register suffices to stop the counter, and the write of 0 to
the load register is questionable anyway since this register resets to
0xffffffff.

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-26 21:19:43 +00:00
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
Russell King
aa25afad2c ARM: amba: make probe() functions take const id tables
Make Primecell driver probe functions take a const pointer to their
ID tables.  Drivers should never modify their ID tables in their
probe handler.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-23 16:24:14 +00:00
Viresh KUMAR
4a370278e1 watchdog: Adding support for ARM Primecell SP805 Watchdog
Technical Reference Manual can be found at:
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0270b/DDI0270.pdf

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2010-08-08 18:22:25 +00:00