[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, 8 insertions, 0 deletions

diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c
index 100d57ad98ed..ba3d21d8fba3 100644
--- a/arch/arm/plat-iop/time.c
+++ b/arch/arm/plat-iop/time.c
@@ -78,6 +78,13 @@ static struct irqaction iop_timer_irq = {
         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 };
 
+static unsigned long iop_tick_rate;
+unsigned long get_iop_tick_rate(void)
+{
+        return iop_tick_rate;
+}
+EXPORT_SYMBOL(get_iop_tick_rate);
+
 void __init iop_init_time(unsigned long tick_rate)
 {
         u32 timer_ctl;
@@ -85,6 +92,7 @@ void __init iop_init_time(unsigned long tick_rate)
         ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
         ticks_per_usec = tick_rate / 1000000;
         next_jiffy_time = 0xffffffff;
+        iop_tick_rate = tick_rate;
 
         timer_ctl = IOP_TMR_EN | IOP_TMR_PRIVILEGED |
                         IOP_TMR_RELOAD | IOP_TMR_RATIO_1_1;