hw/arm/pxa2xx_gpio.c - qemu - Git at Google

 /*
  * Intel XScale PXA255/270 GPIO controller emulation.
  *
  * Copyright (c) 2006 Openedhand Ltd.
  * Written by Andrzej Zaborowski <balrog@zabor.org>
  *
  * This code is licensed under the GPL.
  */

 #include "qemu/osdep.h"
 #include "cpu.h"
 #include "hw/hw.h"
 #include "hw/sysbus.h"
 #include "hw/arm/pxa.h"
 #include "qemu/log.h"

 #define PXA2XX_GPIO_BANKS	4

 #define TYPE_PXA2XX_GPIO "pxa2xx-gpio"
 #define PXA2XX_GPIO(obj) \
     OBJECT_CHECK(PXA2xxGPIOInfo, (obj), TYPE_PXA2XX_GPIO)

 typedef struct PXA2xxGPIOInfo PXA2xxGPIOInfo;
 struct PXA2xxGPIOInfo {
     /*< private >*/
     SysBusDevice parent_obj;
     /*< public >*/

     MemoryRegion iomem;
     qemu_irq irq0, irq1, irqX;
     int lines;
     int ncpu;
     ARMCPU *cpu;

     /* XXX: GNU C vectors are more suitable */
     uint32_t ilevel[PXA2XX_GPIO_BANKS];
     uint32_t olevel[PXA2XX_GPIO_BANKS];
     uint32_t dir[PXA2XX_GPIO_BANKS];
     uint32_t rising[PXA2XX_GPIO_BANKS];
     uint32_t falling[PXA2XX_GPIO_BANKS];
     uint32_t status[PXA2XX_GPIO_BANKS];
     uint32_t gafr[PXA2XX_GPIO_BANKS * 2];

     uint32_t prev_level[PXA2XX_GPIO_BANKS];
     qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
     qemu_irq read_notify;
 };

 static struct {
     enum {
         GPIO_NONE,
         GPLR,
         GPSR,
         GPCR,
         GPDR,
         GRER,
         GFER,
         GEDR,
         GAFR_L,
         GAFR_U,
     } reg;
     int bank;
 } pxa2xx_gpio_regs[0x200] = {
     [0 ... 0x1ff] = { GPIO_NONE, 0 },
 #define PXA2XX_REG(reg, a0, a1, a2, a3)	\
     [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },

     PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
     PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
     PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
     PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
     PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
     PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
     PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
     PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
     PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
 };

 static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
 {
     if (s->status[0] & (1 << 0))
         qemu_irq_raise(s->irq0);
     else
         qemu_irq_lower(s->irq0);

     if (s->status[0] & (1 << 1))
         qemu_irq_raise(s->irq1);
     else
         qemu_irq_lower(s->irq1);

     if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3])
         qemu_irq_raise(s->irqX);
     else
         qemu_irq_lower(s->irqX);
 }

 /* Bitmap of pins used as standby and sleep wake-up sources.  */
 static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
     0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
 };

 static void pxa2xx_gpio_set(void *opaque, int line, int level)
 {
     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
     CPUState *cpu = CPU(s->cpu);
     int bank;
     uint32_t mask;

     if (line >= s->lines) {
         printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
         return;
     }

     bank = line >> 5;
     mask = 1U << (line & 31);

     if (level) {
         s->status[bank] |= s->rising[bank] & mask &
                 ~s->ilevel[bank] & ~s->dir[bank];
         s->ilevel[bank] |= mask;
     } else {
         s->status[bank] |= s->falling[bank] & mask &
                 s->ilevel[bank] & ~s->dir[bank];
         s->ilevel[bank] &= ~mask;
     }

     if (s->status[bank] & mask)
         pxa2xx_gpio_irq_update(s);

     /* Wake-up GPIOs */
     if (cpu->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) {
         cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB);
     }
 }

 static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
     uint32_t level, diff;
     int i, bit, line;
     for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
         level = s->olevel[i] & s->dir[i];

         for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
             bit = ctz32(diff);
             line = bit + 32 * i;
             qemu_set_irq(s->handler[line], (level >> bit) & 1);
         }

         s->prev_level[i] = level;
     }
 }

 static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset,
                                  unsigned size)
 {
     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
     uint32_t ret;
     int bank;
     if (offset >= 0x200)
         return 0;

     bank = pxa2xx_gpio_regs[offset].bank;
     switch (pxa2xx_gpio_regs[offset].reg) {
     case GPDR:		/* GPIO Pin-Direction registers */
         return s->dir[bank];

     case GPSR:		/* GPIO Pin-Output Set registers */
         qemu_log_mask(LOG_GUEST_ERROR,
                       "pxa2xx GPIO: read from write only register GPSR\n");
         return 0;

     case GPCR:		/* GPIO Pin-Output Clear registers */
         qemu_log_mask(LOG_GUEST_ERROR,
                       "pxa2xx GPIO: read from write only register GPCR\n");
         return 0;

     case GRER:		/* GPIO Rising-Edge Detect Enable registers */
         return s->rising[bank];

     case GFER:		/* GPIO Falling-Edge Detect Enable registers */
         return s->falling[bank];

     case GAFR_L:	/* GPIO Alternate Function registers */
         return s->gafr[bank * 2];

     case GAFR_U:	/* GPIO Alternate Function registers */
         return s->gafr[bank * 2 + 1];

     case GPLR:		/* GPIO Pin-Level registers */
         ret = (s->olevel[bank] & s->dir[bank]) |
                 (s->ilevel[bank] & ~s->dir[bank]);
         qemu_irq_raise(s->read_notify);
         return ret;

     case GEDR:		/* GPIO Edge Detect Status registers */
         return s->status[bank];

     default:
         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
     }

     return 0;
 }

 static void pxa2xx_gpio_write(void *opaque, hwaddr offset,
                               uint64_t value, unsigned size)
 {
     PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque;
     int bank;
     if (offset >= 0x200)
         return;

     bank = pxa2xx_gpio_regs[offset].bank;
     switch (pxa2xx_gpio_regs[offset].reg) {
     case GPDR:		/* GPIO Pin-Direction registers */
         s->dir[bank] = value;
         pxa2xx_gpio_handler_update(s);
         break;

     case GPSR:		/* GPIO Pin-Output Set registers */
         s->olevel[bank] |= value;
         pxa2xx_gpio_handler_update(s);
         break;

     case GPCR:		/* GPIO Pin-Output Clear registers */
         s->olevel[bank] &= ~value;
         pxa2xx_gpio_handler_update(s);
         break;

     case GRER:		/* GPIO Rising-Edge Detect Enable registers */
         s->rising[bank] = value;
         break;

     case GFER:		/* GPIO Falling-Edge Detect Enable registers */
         s->falling[bank] = value;
         break;

     case GAFR_L:	/* GPIO Alternate Function registers */
         s->gafr[bank * 2] = value;
         break;

     case GAFR_U:	/* GPIO Alternate Function registers */
         s->gafr[bank * 2 + 1] = value;
         break;

     case GEDR:		/* GPIO Edge Detect Status registers */
         s->status[bank] &= ~value;
         pxa2xx_gpio_irq_update(s);
         break;

     default:
         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
     }
 }

 static const MemoryRegionOps pxa_gpio_ops = {
     .read = pxa2xx_gpio_read,
     .write = pxa2xx_gpio_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
 };

 DeviceState *pxa2xx_gpio_init(hwaddr base,
                               ARMCPU *cpu, DeviceState *pic, int lines)
 {
     CPUState *cs = CPU(cpu);
     DeviceState *dev;

     dev = qdev_create(NULL, TYPE_PXA2XX_GPIO);
     qdev_prop_set_int32(dev, "lines", lines);
     qdev_prop_set_int32(dev, "ncpu", cs->cpu_index);
     qdev_init_nofail(dev);

     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0));
     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1,
                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1));
     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2,
                     qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X));

     return dev;
 }

 static void pxa2xx_gpio_initfn(Object *obj)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     DeviceState *dev = DEVICE(sbd);
     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

     memory_region_init_io(&s->iomem, obj, &pxa_gpio_ops,
                           s, "pxa2xx-gpio", 0x1000);
     sysbus_init_mmio(sbd, &s->iomem);
     sysbus_init_irq(sbd, &s->irq0);
     sysbus_init_irq(sbd, &s->irq1);
     sysbus_init_irq(sbd, &s->irqX);
 }

 static void pxa2xx_gpio_realize(DeviceState *dev, Error **errp)
 {
     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

     s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu));

     qdev_init_gpio_in(dev, pxa2xx_gpio_set, s->lines);
     qdev_init_gpio_out(dev, s->handler, s->lines);
 }

 /*
  * Registers a callback to notify on GPLR reads.  This normally
  * shouldn't be needed but it is used for the hack on Spitz machines.
  */
 void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler)
 {
     PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

     s->read_notify = handler;
 }

 static const VMStateDescription vmstate_pxa2xx_gpio_regs = {
     .name = "pxa2xx-gpio",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2),
         VMSTATE_UINT32_ARRAY(prev_level, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
         VMSTATE_END_OF_LIST(),
     },
 };

 static Property pxa2xx_gpio_properties[] = {
     DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0),
     DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void pxa2xx_gpio_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->desc = "PXA2xx GPIO controller";
     dc->props = pxa2xx_gpio_properties;
     dc->vmsd = &vmstate_pxa2xx_gpio_regs;
     dc->realize = pxa2xx_gpio_realize;
 }

 static const TypeInfo pxa2xx_gpio_info = {
     .name          = TYPE_PXA2XX_GPIO,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(PXA2xxGPIOInfo),
     .instance_init = pxa2xx_gpio_initfn,
     .class_init    = pxa2xx_gpio_class_init,
 };

 static void pxa2xx_gpio_register_types(void)
 {
     type_register_static(&pxa2xx_gpio_info);
 }

 type_init(pxa2xx_gpio_register_types)
	/*
	* Intel XScale PXA255/270 GPIO controller emulation.
	*
	* Copyright (c) 2006 Openedhand Ltd.
	* Written by Andrzej Zaborowski <balrog@zabor.org>
	*
	* This code is licensed under the GPL.
	*/

	#include "qemu/osdep.h"
	#include "cpu.h"
	#include "hw/hw.h"
	#include "hw/sysbus.h"
	#include "hw/arm/pxa.h"
	#include "qemu/log.h"

	#define PXA2XX_GPIO_BANKS 4

	#define TYPE_PXA2XX_GPIO "pxa2xx-gpio"
	#define PXA2XX_GPIO(obj) \
	OBJECT_CHECK(PXA2xxGPIOInfo, (obj), TYPE_PXA2XX_GPIO)

	typedef struct PXA2xxGPIOInfo PXA2xxGPIOInfo;
	struct PXA2xxGPIOInfo {
	/< private >/
	SysBusDevice parent_obj;
	/< public >/

	MemoryRegion iomem;
	qemu_irq irq0, irq1, irqX;
	int lines;
	int ncpu;
	ARMCPU *cpu;

	/* XXX: GNU C vectors are more suitable */
	uint32_t ilevel[PXA2XX_GPIO_BANKS];
	uint32_t olevel[PXA2XX_GPIO_BANKS];
	uint32_t dir[PXA2XX_GPIO_BANKS];
	uint32_t rising[PXA2XX_GPIO_BANKS];
	uint32_t falling[PXA2XX_GPIO_BANKS];
	uint32_t status[PXA2XX_GPIO_BANKS];
	uint32_t gafr[PXA2XX_GPIO_BANKS * 2];

	uint32_t prev_level[PXA2XX_GPIO_BANKS];
	qemu_irq handler[PXA2XX_GPIO_BANKS * 32];
	qemu_irq read_notify;
	};

	static struct {
	enum {
	GPIO_NONE,
	GPLR,
	GPSR,
	GPCR,
	GPDR,
	GRER,
	GFER,
	GEDR,
	GAFR_L,
	GAFR_U,
	} reg;
	int bank;
	} pxa2xx_gpio_regs[0x200] = {
	[0 ... 0x1ff] = { GPIO_NONE, 0 },
	#define PXA2XX_REG(reg, a0, a1, a2, a3) \
	[a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 },

	PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100)
	PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118)
	PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124)
	PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c)
	PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130)
	PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c)
	PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148)
	PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c)
	PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070)
	};

	static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s)
	{
	if (s->status[0] & (1 << 0))
	qemu_irq_raise(s->irq0);
	else
	qemu_irq_lower(s->irq0);

	if (s->status[0] & (1 << 1))
	qemu_irq_raise(s->irq1);
	else
	qemu_irq_lower(s->irq1);

	if ((s->status[0] & ~3) \| s->status[1] \| s->status[2] \| s->status[3])
	qemu_irq_raise(s->irqX);
	else
	qemu_irq_lower(s->irqX);
	}

	/* Bitmap of pins used as standby and sleep wake-up sources. */
	static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = {
	0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f,
	};

	static void pxa2xx_gpio_set(void *opaque, int line, int level)
	{
	PXA2xxGPIOInfo s = (PXA2xxGPIOInfo ) opaque;
	CPUState *cpu = CPU(s->cpu);
	int bank;
	uint32_t mask;

	if (line >= s->lines) {
	printf("%s: No GPIO pin %i\n", __FUNCTION__, line);
	return;
	}

	bank = line >> 5;
	mask = 1U << (line & 31);

	if (level) {
	s->status[bank] \|= s->rising[bank] & mask &
	~s->ilevel[bank] & ~s->dir[bank];
	s->ilevel[bank] \|= mask;
	} else {
	s->status[bank] \|= s->falling[bank] & mask &
	s->ilevel[bank] & ~s->dir[bank];
	s->ilevel[bank] &= ~mask;
	}

	if (s->status[bank] & mask)
	pxa2xx_gpio_irq_update(s);

	/* Wake-up GPIOs */
	if (cpu->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) {
	cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB);
	}
	}

	static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) {
	uint32_t level, diff;
	int i, bit, line;
	for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) {
	level = s->olevel[i] & s->dir[i];

	for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) {
	bit = ctz32(diff);
	line = bit + 32 * i;
	qemu_set_irq(s->handler[line], (level >> bit) & 1);
	}

	s->prev_level[i] = level;
	}
	}

	static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset,
	unsigned size)
	{
	PXA2xxGPIOInfo s = (PXA2xxGPIOInfo ) opaque;
	uint32_t ret;
	int bank;
	if (offset >= 0x200)
	return 0;

	bank = pxa2xx_gpio_regs[offset].bank;
	switch (pxa2xx_gpio_regs[offset].reg) {
	case GPDR: /* GPIO Pin-Direction registers */
	return s->dir[bank];

	case GPSR: /* GPIO Pin-Output Set registers */
	qemu_log_mask(LOG_GUEST_ERROR,
	"pxa2xx GPIO: read from write only register GPSR\n");
	return 0;

	case GPCR: /* GPIO Pin-Output Clear registers */
	qemu_log_mask(LOG_GUEST_ERROR,
	"pxa2xx GPIO: read from write only register GPCR\n");
	return 0;

	case GRER: /* GPIO Rising-Edge Detect Enable registers */
	return s->rising[bank];

	case GFER: /* GPIO Falling-Edge Detect Enable registers */
	return s->falling[bank];

	case GAFR_L: /* GPIO Alternate Function registers */
	return s->gafr[bank * 2];

	case GAFR_U: /* GPIO Alternate Function registers */
	return s->gafr[bank * 2 + 1];

	case GPLR: /* GPIO Pin-Level registers */
	ret = (s->olevel[bank] & s->dir[bank]) \|
	(s->ilevel[bank] & ~s->dir[bank]);
	qemu_irq_raise(s->read_notify);
	return ret;

	case GEDR: /* GPIO Edge Detect Status registers */
	return s->status[bank];

	default:
	hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
	}

	return 0;
	}

	static void pxa2xx_gpio_write(void *opaque, hwaddr offset,
	uint64_t value, unsigned size)
	{
	PXA2xxGPIOInfo s = (PXA2xxGPIOInfo ) opaque;
	int bank;
	if (offset >= 0x200)
	return;

	bank = pxa2xx_gpio_regs[offset].bank;
	switch (pxa2xx_gpio_regs[offset].reg) {
	case GPDR: /* GPIO Pin-Direction registers */
	s->dir[bank] = value;
	pxa2xx_gpio_handler_update(s);
	break;

	case GPSR: /* GPIO Pin-Output Set registers */
	s->olevel[bank] \|= value;
	pxa2xx_gpio_handler_update(s);
	break;

	case GPCR: /* GPIO Pin-Output Clear registers */
	s->olevel[bank] &= ~value;
	pxa2xx_gpio_handler_update(s);
	break;

	case GRER: /* GPIO Rising-Edge Detect Enable registers */
	s->rising[bank] = value;
	break;

	case GFER: /* GPIO Falling-Edge Detect Enable registers */
	s->falling[bank] = value;
	break;

	case GAFR_L: /* GPIO Alternate Function registers */
	s->gafr[bank * 2] = value;
	break;

	case GAFR_U: /* GPIO Alternate Function registers */
	s->gafr[bank * 2 + 1] = value;
	break;

	case GEDR: /* GPIO Edge Detect Status registers */
	s->status[bank] &= ~value;
	pxa2xx_gpio_irq_update(s);
	break;

	default:
	hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
	}
	}

	static const MemoryRegionOps pxa_gpio_ops = {
	.read = pxa2xx_gpio_read,
	.write = pxa2xx_gpio_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	};

	DeviceState *pxa2xx_gpio_init(hwaddr base,
	ARMCPU cpu, DeviceState pic, int lines)
	{
	CPUState *cs = CPU(cpu);
	DeviceState *dev;

	dev = qdev_create(NULL, TYPE_PXA2XX_GPIO);
	qdev_prop_set_int32(dev, "lines", lines);
	qdev_prop_set_int32(dev, "ncpu", cs->cpu_index);
	qdev_init_nofail(dev);

	sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
	sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
	qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0));
	sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1,
	qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1));
	sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2,
	qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X));

	return dev;
	}

	static void pxa2xx_gpio_initfn(Object *obj)
	{
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
	DeviceState *dev = DEVICE(sbd);
	PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

	memory_region_init_io(&s->iomem, obj, &pxa_gpio_ops,
	s, "pxa2xx-gpio", 0x1000);
	sysbus_init_mmio(sbd, &s->iomem);
	sysbus_init_irq(sbd, &s->irq0);
	sysbus_init_irq(sbd, &s->irq1);
	sysbus_init_irq(sbd, &s->irqX);
	}

	static void pxa2xx_gpio_realize(DeviceState dev, Error *errp)
	{
	PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

	s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu));

	qdev_init_gpio_in(dev, pxa2xx_gpio_set, s->lines);
	qdev_init_gpio_out(dev, s->handler, s->lines);
	}

	/*
	* Registers a callback to notify on GPLR reads. This normally
	* shouldn't be needed but it is used for the hack on Spitz machines.
	*/
	void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler)
	{
	PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev);

	s->read_notify = handler;
	}

	static const VMStateDescription vmstate_pxa2xx_gpio_regs = {
	.name = "pxa2xx-gpio",
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2),
	VMSTATE_UINT32_ARRAY(prev_level, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS),
	VMSTATE_END_OF_LIST(),
	},
	};

	static Property pxa2xx_gpio_properties[] = {
	DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0),
	DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void pxa2xx_gpio_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->desc = "PXA2xx GPIO controller";
	dc->props = pxa2xx_gpio_properties;
	dc->vmsd = &vmstate_pxa2xx_gpio_regs;
	dc->realize = pxa2xx_gpio_realize;
	}

	static const TypeInfo pxa2xx_gpio_info = {
	.name = TYPE_PXA2XX_GPIO,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(PXA2xxGPIOInfo),
	.instance_init = pxa2xx_gpio_initfn,
	.class_init = pxa2xx_gpio_class_init,
	};

	static void pxa2xx_gpio_register_types(void)
	{
	type_register_static(&pxa2xx_gpio_info);
	}

	type_init(pxa2xx_gpio_register_types)