[Qemu-devel] [PATCH] integrator/cp: add support for REFCNT register

[Jan Petrouš]

Linux kernel from version 3.4 requires CM_REFCNT register for sched timer

for Integrator/CP board (integrator_defconfig).

See http://infocenter.arm.com/help/topic/com.arm.doc.dui0138e/ch04s06s11.html

Signed-off-by: Jan Petrous <address@hidden>

---

 hw/arm/integratorcp.c | 7 +++++--

 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/arm/integratorcp.c b/hw/arm/integratorcp.c

index c44b2a4..f419764 100644

--- a/hw/arm/integratorcp.c

+++ b/hw/arm/integratorcp.c

@@ -83,8 +83,11 @@ static uint64_t integratorcm_read(void *opaque, hwaddr offset,

     case 9: /* CM_INIT */

         return s->cm_init;

     case 10: /* CM_REFCT */

-        /* ??? High frequency timer.  */

-        hw_error("integratorcm_read: CM_REFCT");

+       /* This register, CM_REFCNT, provides a 32-bit count value.

+ * The count increments at the fixed reference clock frequency of 24MHz

+ * and can be used as a real-time counter.

+ */

+       return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), 24, 1000);

     case 12: /* CM_FLAGS */

         return s->cm_flags;

     case 14: /* CM_NVFLAGS */

-- 

1.7.11.3

0001-integrator-cp-add-support-for-REFCNT-register.patch
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