iop: clocksource support

This updates the IOP platform to expose the free-running
timer 1 as a clocksource object. This timer is now also
properly initialised, which requires a new write_tcr1()
function from the mach-specific code. Apart from the
explicit initialisation, there is no functional change
in how timer 1 is programmed.

Tested on n2100, compile-tested for all plat-iop machines.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm/include/asm/hardware/iop3xx.h b/arch/arm/include/asm/hardware/iop3xx.h
index 8d60ad267e3..643b7b95b25 100644
--- a/arch/arm/include/asm/hardware/iop3xx.h
+++ b/arch/arm/include/asm/hardware/iop3xx.h
@@ -260,6 +260,11 @@ static inline u32 read_tcr1(void)
 	return val;
 }
 
+static inline void write_tcr1(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c3, c1, 0" : : "r" (val));
+}
+
 static inline void write_trr0(u32 val)
 {
 	asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (val));