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integrator/cp: add support for REFCNT register 

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 <jan.petrous@tieto.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jan Petrous 2013-12-10 13:24:51 +00:00 committed by Peter Maydell
parent 8f84271da8
commit f53977f788
1 changed files with 10 additions and 3 deletions
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13
hw/arm/integratorcp.c
View File

@ -36,6 +36,7 @@ typedef struct IntegratorCMState {
uint32_t cm_init;
uint32_t cm_flags;
uint32_t cm_nvflags;
uint32_t cm_refcnt_offset;
uint32_t int_level;
uint32_t irq_enabled;
uint32_t fiq_enabled;
@ -82,9 +83,13 @@ static uint64_t integratorcm_read(void *opaque, hwaddr offset,
return s->cm_sdram;
case 9: /* CM_INIT */
return s->cm_init;
case 10: /* CM_REFCT */
/* ??? High frequency timer. */
hw_error("integratorcm_read: CM_REFCT");
case 10: /* CM_REFCNT */
/* 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 (uint32_t)muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), 24,
1000) - s->cm_refcnt_offset;
case 12: /* CM_FLAGS */
return s->cm_flags;
case 14: /* CM_NVFLAGS */
@ -257,6 +262,8 @@ static int integratorcm_init(SysBusDevice *dev)
}
memcpy(integrator_spd + 73, "QEMU-MEMORY", 11);
s->cm_init = 0x00000112;
s->cm_refcnt_offset = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), 24,
1000);
memory_region_init_ram(&s->flash, OBJECT(s), "integrator.flash", 0x100000);
vmstate_register_ram_global(&s->flash);