[04/20] apci: switch timer to memory api

diff --git a/hw/acpi.c b/hw/acpi.c
index f4aca49..ba25c23 100644
--- a/hw/acpi.c
+++ b/hw/acpi.c
@@ -331,7 +331,7 @@  void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)
     ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;
 }
 
-uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
+static uint32_t acpi_pm_tmr_get(ACPIREGS *ar)
 {
     uint32_t d = acpi_pm_tmr_get_clock();
     return d & 0xffffff;
@@ -344,10 +344,25 @@  static void acpi_pm_tmr_timer(void *opaque)
     ar->tmr.update_sci(ar);
 }
 
-void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci)
+static uint64_t acpi_pm_tmr_read(void *opaque, hwaddr addr, unsigned width)
+{
+    return acpi_pm_tmr_get(opaque);
+}
+
+static const MemoryRegionOps acpi_pm_tmr_ops = {
+    .read = acpi_pm_tmr_read,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
+                      MemoryRegion *parent)
 {
     ar->tmr.update_sci = update_sci;
     ar->tmr.timer = qemu_new_timer_ns(vm_clock, acpi_pm_tmr_timer, ar);
+    memory_region_init_io(&ar->tmr.io, &acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
+    memory_region_add_subregion(parent, 8, &ar->tmr.io);
 }
 
 void acpi_pm_tmr_reset(ACPIREGS *ar)
diff --git a/hw/acpi.h b/hw/acpi.h
index 7337f41..91f42c3 100644
--- a/hw/acpi.h
+++ b/hw/acpi.h
@@ -84,6 +84,7 @@  typedef void (*acpi_update_sci_fn)(ACPIREGS *ar);
 
 struct ACPIPMTimer {
     QEMUTimer *timer;
+    MemoryRegion io;
     int64_t overflow_time;
 
     acpi_update_sci_fn update_sci;
@@ -119,8 +120,8 @@  struct ACPIREGS {
 /* PM_TMR */
 void acpi_pm_tmr_update(ACPIREGS *ar, bool enable);
 void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar);
-uint32_t acpi_pm_tmr_get(ACPIREGS *ar);
-void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci);
+void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
+                      MemoryRegion *parent);
 void acpi_pm_tmr_reset(ACPIREGS *ar);
 
 #include "qemu-timer.h"
diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c
index 086f230..9301dbf 100644
--- a/hw/acpi_piix4.c
+++ b/hw/acpi_piix4.c
@@ -154,9 +154,6 @@  static uint64_t pm_ioport_read(void *opaque, hwaddr addr, unsigned width)
     case 0x04:
         val = s->ar.pm1.cnt.cnt;
         break;
-    case 0x08:
-        val = acpi_pm_tmr_get(&s->ar);
-        break;
     default:
         val = 0;
         break;
@@ -464,7 +461,7 @@  static int piix4_pm_initfn(PCIDevice *dev)
     register_ioport_read(s->smb_io_base, 64, 1, smb_ioport_readb, &s->smb);
 
     memory_region_init_io(&s->io, &pm_io_ops, s, "piix4-pm", 64);
-    acpi_pm_tmr_init(&s->ar, pm_tmr_timer);
+    acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
     acpi_gpe_init(&s->ar, GPE_LEN);
 
     s->powerdown_notifier.notify = piix4_pm_powerdown_req;
diff --git a/hw/vt82c686.c b/hw/vt82c686.c
index 7f9c7a2..33155eb 100644
--- a/hw/vt82c686.c
+++ b/hw/vt82c686.c
@@ -252,14 +252,10 @@  static void pm_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
 
 static uint32_t pm_ioport_readl(void *opaque, uint32_t addr)
 {
-    VT686PMState *s = opaque;
     uint32_t val;
 
     addr &= 0x0f;
     switch (addr) {
-    case 0x08:
-        val = acpi_pm_tmr_get(&s->ar);
-        break;
     default:
         val = 0;
         break;
@@ -447,7 +443,7 @@  static int vt82c686b_pm_initfn(PCIDevice *dev)
     apm_init(&s->apm, NULL, s);
 
     memory_region_init_io(&s->io, &pm_io_ops, s, "vt82c686-pm", 64);
-    acpi_pm_tmr_init(&s->ar, pm_tmr_timer);
+    acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
     acpi_pm1_cnt_init(&s->ar);
 
     pm_smbus_init(&s->dev.qdev, &s->smb);