diff --git a/hw/i8254.c b/hw/i8254.c
index 06b225c..680caab 100644
--- a/hw/i8254.c
+++ b/hw/i8254.c
@@ -53,9 +53,12 @@ typedef struct PITChannelState {
     qemu_irq irq;
 } PITChannelState;

-struct PITState {
+typedef struct PITState {
+    ISADevice dev;
+    uint32_t irq;
+    uint32_t iobase;
     PITChannelState channels[3];
-};
+} PITState;

 static PITState pit_state;

@@ -119,8 +122,9 @@ static int pit_get_out1(PITChannelState *s,
int64_t current_time)
     return out;
 }

-int pit_get_out(PITState *pit, int channel, int64_t current_time)
+int pit_get_out(ISADevice *dev, int channel, int64_t current_time)
 {
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s = &pit->channels[channel];
     return pit_get_out1(s, current_time);
 }
@@ -179,8 +183,9 @@ static int64_t
pit_get_next_transition_time(PITChannelState *s,
 }

 /* val must be 0 or 1 */
-void pit_set_gate(PITState *pit, int channel, int val)
+void pit_set_gate(ISADevice *dev, int channel, int val)
 {
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s = &pit->channels[channel];

     switch(s->mode) {
@@ -210,20 +215,23 @@ void pit_set_gate(PITState *pit, int channel, int val)
     s->gate = val;
 }

-int pit_get_gate(PITState *pit, int channel)
+int pit_get_gate(ISADevice *dev, int channel)
 {
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s = &pit->channels[channel];
     return s->gate;
 }

-int pit_get_initial_count(PITState *pit, int channel)
+int pit_get_initial_count(ISADevice *dev, int channel)
 {
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s = &pit->channels[channel];
     return s->count;
 }

-int pit_get_mode(PITState *pit, int channel)
+int pit_get_mode(ISADevice *dev, int channel)
 {
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s = &pit->channels[channel];
     return s->mode;
 }
@@ -462,9 +470,9 @@ static const VMStateDescription vmstate_pit = {
     }
 };

-static void pit_reset(void *opaque)
+static void pit_reset(DeviceState *dev)
 {
-    PITState *pit = opaque;
+    PITState *pit = container_of(dev, PITState, dev.qdev);
     PITChannelState *s;
     int i;

@@ -498,20 +506,39 @@ void hpet_pit_enable(void)
     pit_load_count(s, 0);
 }

-PITState *pit_init(int base, qemu_irq irq)
+static int pit_initfn(ISADevice *dev)
 {
-    PITState *pit = &pit_state;
+    PITState *pit = DO_UPCAST(PITState, dev, dev);
     PITChannelState *s;

     s = &pit->channels[0];
     /* the timer 0 is connected to an IRQ */
     s->irq_timer = qemu_new_timer(vm_clock, pit_irq_timer, s);
-    s->irq = irq;
+    s->irq = isa_reserve_irq(pit->irq);

-    vmstate_register(NULL, base, &vmstate_pit, pit);
-    qemu_register_reset(pit_reset, pit);
-    register_ioport_write(base, 4, 1, pit_ioport_write, pit);
-    register_ioport_read(base, 3, 1, pit_ioport_read, pit);
+    register_ioport_write(pit->iobase, 4, 1, pit_ioport_write, pit);
+    register_ioport_read(pit->iobase, 3, 1, pit_ioport_read, pit);
+    isa_init_ioport(dev, pit->iobase);

-    return pit;
+    return 0;
+}
+
+static ISADeviceInfo pit_info = {
+    .qdev.name     = "isa-pit",
+    .qdev.size     = sizeof(PITState),
+    .qdev.vmsd     = &vmstate_pit,
+    .qdev.reset    = pit_reset,
+    .qdev.no_user  = 1,
+    .init          = pit_initfn,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_UINT32("irq", PITState, irq,  -1),
+        DEFINE_PROP_HEX32("iobase", PITState, iobase,  -1),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void pit_register(void)
+{
+    isa_qdev_register(&pit_info);
 }
+device_init(pit_register)
diff --git a/hw/mips_fulong2e.c b/hw/mips_fulong2e.c
index 2783ed5..f5ae639 100644
--- a/hw/mips_fulong2e.c
+++ b/hw/mips_fulong2e.c
@@ -67,7 +67,7 @@
 #define FULONG2E_ATI_SLOT        6
 #define FULONG2E_RTL8139_SLOT    7

-static PITState *pit;
+static ISADevice *pit;

 static struct _loaderparams {
     int ram_size;
@@ -369,7 +369,7 @@ static void mips_fulong2e_init(ram_addr_t
ram_size, const char *boot_device,
     qdev_init_nofail(eeprom);

     /* init other devices */
-    pit = pit_init(0x40, isa_reserve_irq(0));
+    pit = pit_init(0x40, 0);
     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);

diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index 85eba5a..a100394 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -115,7 +115,7 @@ void mips_jazz_init (ram_addr_t ram_size,
     void* rc4030_opaque;
     int s_rtc, s_dma_dummy;
     NICInfo *nd;
-    PITState *pit;
+    ISADevice *pit;
     DriveInfo *fds[MAX_FD];
     qemu_irq esp_reset, dma_enable;
     qemu_irq *cpu_exit_irq;
@@ -181,7 +181,7 @@ void mips_jazz_init (ram_addr_t ram_size,
     isa_bus_irqs(i8259);
     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);
-    pit = pit_init(0x40, i8259[0]);
+    pit = pit_init(0x40, 0);
     pcspk_init(pit);

     /* ISA IO space at 0x90000000 */
diff --git a/hw/mips_malta.c b/hw/mips_malta.c
index 930c51c..ca6c6d7 100644
--- a/hw/mips_malta.c
+++ b/hw/mips_malta.c
@@ -68,7 +68,7 @@ typedef struct {
     SerialState *uart;
 } MaltaFPGAState;

-static PITState *pit;
+static ISADevice *pit;

 static struct _loaderparams {
     int ram_size;
@@ -930,7 +930,7 @@ void mips_malta_init (ram_addr_t ram_size,
         qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256));
         qdev_init_nofail(eeprom);
     }
-    pit = pit_init(0x40, isa_reserve_irq(0));
+    pit = pit_init(0x40, 0);
     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);

diff --git a/hw/mips_r4k.c b/hw/mips_r4k.c
index fb34dcf..8feb461 100644
--- a/hw/mips_r4k.c
+++ b/hw/mips_r4k.c
@@ -30,7 +30,7 @@ static const int ide_iobase[2] = { 0x1f0, 0x170 };
 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
 static const int ide_irq[2] = { 14, 15 };

-static PITState *pit; /* PIT i8254 */
+static ISADevice *pit; /* PIT i8254 */

 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */

@@ -274,7 +274,7 @@ void mips_r4k_init (ram_addr_t ram_size,
     isa_mmio_init(0x14000000, 0x00010000);
     isa_mem_base = 0x10000000;

-    pit = pit_init(0x40, i8259[0]);
+    pit = pit_init(0x40, 0);

     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
         if (serial_hds[i]) {
diff --git a/hw/pc.c b/hw/pc.c
index 36641b3..3d7e036 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1104,10 +1104,9 @@ void pc_basic_device_init(qemu_irq *isa_irq,
 {
     int i;
     DriveInfo *fd[MAX_FD];
-    PITState *pit;
     qemu_irq rtc_irq = NULL;
     qemu_irq *a20_line;
-    ISADevice *i8042, *port92, *vmmouse;
+    ISADevice *i8042, *port92, *vmmouse, *pit;
     qemu_irq *cpu_exit_irq;

     register_ioport_write(0x80, 1, 1, ioport80_write, NULL);
@@ -1128,7 +1127,7 @@ void pc_basic_device_init(qemu_irq *isa_irq,

     qemu_register_boot_set(pc_boot_set, *rtc_state);

-    pit = pit_init(0x40, isa_reserve_irq(0));
+    pit = pit_init(0x40, 0);
     pcspk_init(pit);

     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
diff --git a/hw/pc.h b/hw/pc.h
index 60f8c42..feb8a7a 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -82,14 +82,23 @@ void isa_irq_handler(void *opaque, int n, int level);

 #define PIT_FREQ 1193182

-typedef struct PITState PITState;
+static inline ISADevice *pit_init(int base, int irq)
+{
+    ISADevice *dev;
+
+    dev = isa_create("isa-pit");
+    qdev_prop_set_uint32(&dev->qdev, "iobase", base);
+    qdev_prop_set_uint32(&dev->qdev, "irq", irq);
+    qdev_init_nofail(&dev->qdev);
+
+    return dev;
+}

-PITState *pit_init(int base, qemu_irq irq);
-void pit_set_gate(PITState *pit, int channel, int val);
-int pit_get_gate(PITState *pit, int channel);
-int pit_get_initial_count(PITState *pit, int channel);
-int pit_get_mode(PITState *pit, int channel);
-int pit_get_out(PITState *pit, int channel, int64_t current_time);
+void pit_set_gate(ISADevice *dev, int channel, int val);
+int pit_get_gate(ISADevice *dev, int channel);
+int pit_get_initial_count(ISADevice *dev, int channel);
+int pit_get_mode(ISADevice *dev, int channel);
+int pit_get_out(ISADevice *dev, int channel, int64_t current_time);

 void hpet_pit_disable(void);
 void hpet_pit_enable(void);
@@ -159,7 +168,7 @@ void piix4_smbus_register_device(SMBusDevice *dev,
uint8_t addr);
 extern int no_hpet;

 /* pcspk.c */
-void pcspk_init(PITState *);
+void pcspk_init(ISADevice *pit);
 int pcspk_audio_init(qemu_irq *pic);

 /* piix_pci.c */
diff --git a/hw/pcspk.c b/hw/pcspk.c
index 26a0ecb..5f02908 100644
--- a/hw/pcspk.c
+++ b/hw/pcspk.c
@@ -37,7 +37,7 @@ typedef struct {
     uint8_t sample_buf[PCSPK_BUF_LEN];
     QEMUSoundCard card;
     SWVoiceOut *voice;
-    PITState *pit;
+    ISADevice *pit;
     unsigned int pit_count;
     unsigned int samples;
     unsigned int play_pos;
@@ -137,7 +137,7 @@ static void pcspk_ioport_write(void *opaque,
uint32_t addr, uint32_t val)
     }
 }

-void pcspk_init(PITState *pit)
+void pcspk_init(ISADevice *pit)
 {
     PCSpkState *s = &pcspk_state;

diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 6c1499a..6c9826b 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -82,7 +82,7 @@ static const int ide_irq[2] = { 13, 13 };
 static uint32_t ne2000_io[NE2000_NB_MAX] = { 0x300, 0x320, 0x340,
0x360, 0x280, 0x380 };
 static int ne2000_irq[NE2000_NB_MAX] = { 9, 10, 11, 3, 4, 5 };

-//static PITState *pit;
+//static ISADevice *pit;

 /* ISA IO ports bridge */
