[ARM] 4495/1: iop: combined watchdog timer driver for iop3xx and iop13xx

In order for this driver to be shared across the iop architectures the
iop3xx and iop13xx header files are modified to present a common interface
for the iop_wdt driver.

Details:
* iop13xx supports disabling the timer while iop3xx does not.  This requires
  a few 'compatibility' definitions in include/asm-arm/hardware/iop3xx.h to
  preclude adding #ifdef CONFIG_ARCH_IOP13XX blocks to the driver code.
* The heartbeat interval is derived from the internal bus clock rate, so this
  this patch also exports the tick rate to the iop_wdt driver.

Cc: Curt Bruns <curt.e.bruns@intel.com>
Cc: Peter Milne <peter.milne@d-tacq.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/char/watchdog/Kconfig b/drivers/char/watchdog/Kconfig
index 2f48ba329961..a4d81cda479e 100644
--- a/drivers/char/watchdog/Kconfig
+++ b/drivers/char/watchdog/Kconfig
@@ -187,6 +187,22 @@ config PNX4008_WATCHDOG
 
           Say N if you are unsure.
 
+config IOP_WATCHDOG
+        tristate "IOP Watchdog"
+        depends on WATCHDOG && PLAT_IOP
+        select WATCHDOG_NOWAYOUT if (ARCH_IOP32X || ARCH_IOP33X)
+        help
+          Say Y here if to include support for the watchdog timer
+          in the Intel IOP3XX & IOP13XX I/O Processors.  This driver can
+          be built as a module by choosing M. The module will
+          be called iop_wdt.
+
+          Note: The IOP13XX watchdog does an Internal Bus Reset which will
+          affect both cores and the peripherals of the IOP.  The ATU-X
+          and/or ATUe configuration registers will remain intact, but if
+          operating as an Root Complex and/or Central Resource, the PCI-X
+          and/or PCIe busses will also be reset.  THIS IS A VERY BIG HAMMER.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT