[PATCH 4/6] hw/rtc/mc146818rtc: Add a property for the availability of the slew tick policy

[Thomas Huth <thuth@redhat.com>]

We want to get rid of the "#ifdef TARGET_I386" statements in the mc146818
code, so we need a different way to decide whether the slew tick policy
is available or not. Introduce a new property "slew-tick-policy-available"
which can be set by the machines that support this tick policy.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 include/hw/rtc/mc146818rtc.h |  1 +
 hw/i386/pc_piix.c            |  1 +
 hw/isa/lpc_ich9.c            |  1 +
 hw/isa/piix3.c               |  1 +
 hw/rtc/mc146818rtc.c         | 16 ++++++++++------
 5 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/include/hw/rtc/mc146818rtc.h b/include/hw/rtc/mc146818rtc.h
index 1db0fcee92..54af63d091 100644
--- a/include/hw/rtc/mc146818rtc.h
+++ b/include/hw/rtc/mc146818rtc.h
@@ -45,6 +45,7 @@ struct RTCState {
     QEMUTimer *coalesced_timer;
     Notifier clock_reset_notifier;
     LostTickPolicy lost_tick_policy;
+    bool slew_tick_policy_available;
     Notifier suspend_notifier;
     QLIST_ENTRY(RTCState) link;
 };
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index bc9ea8cdae..382c6add3b 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -233,6 +233,7 @@ static void pc_init1(MachineState *machine,
 
         rtc_state = isa_new(TYPE_MC146818_RTC);
         qdev_prop_set_int32(DEVICE(rtc_state), "base_year", 2000);
+        qdev_prop_set_bit(DEVICE(rtc_state), "slew-tick-policy-available", true);
         isa_realize_and_unref(rtc_state, isa_bus, &error_fatal);
 
         i8257_dma_init(isa_bus, 0);
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index 498175c1cc..aeab4d8549 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -733,6 +733,7 @@ static void ich9_lpc_realize(PCIDevice *d, Error **errp)
 
     /* RTC */
     qdev_prop_set_int32(DEVICE(&lpc->rtc), "base_year", 2000);
+    qdev_prop_set_bit(DEVICE(&lpc->rtc), "slew-tick-policy-available", true);
     if (!qdev_realize(DEVICE(&lpc->rtc), BUS(isa_bus), errp)) {
         return;
     }
diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index c68e51ddad..825b1cbee2 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -316,6 +316,7 @@ static void pci_piix3_realize(PCIDevice *dev, Error **errp)
 
     /* RTC */
     qdev_prop_set_int32(DEVICE(&d->rtc), "base_year", 2000);
+    qdev_prop_set_bit(DEVICE(&d->rtc), "slew-tick-policy-available", true);
     if (!qdev_realize(DEVICE(&d->rtc), BUS(isa_bus), errp)) {
         return;
     }
diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c
index 947d68c257..86381a74c3 100644
--- a/hw/rtc/mc146818rtc.c
+++ b/hw/rtc/mc146818rtc.c
@@ -922,14 +922,16 @@ static void rtc_realizefn(DeviceState *dev, Error **errp)
     rtc_set_date_from_host(isadev);
 
     switch (s->lost_tick_policy) {
-#ifdef TARGET_I386
-    case LOST_TICK_POLICY_SLEW:
-        s->coalesced_timer =
-            timer_new_ns(rtc_clock, rtc_coalesced_timer, s);
-        break;
-#endif
     case LOST_TICK_POLICY_DISCARD:
         break;
+    case LOST_TICK_POLICY_SLEW:
+#ifdef TARGET_I386
+        if (s->slew_tick_policy_available) {
+            s->coalesced_timer = timer_new_ns(rtc_clock, rtc_coalesced_timer, s);
+            break;
+        }
+#endif
+        /* fallthrough */
     default:
         error_setg(errp, "Invalid lost tick policy.");
         return;
@@ -989,6 +991,8 @@ static Property mc146818rtc_properties[] = {
     DEFINE_PROP_UINT8("irq", RTCState, isairq, RTC_ISA_IRQ),
     DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
                                lost_tick_policy, LOST_TICK_POLICY_DISCARD),
+    DEFINE_PROP_BOOL("slew-tick-policy-available", RTCState,
+                     slew_tick_policy_available, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-- 
2.31.1