hw/dma/sparc32_dma.c - qemu - Git at Google

 /*
  * QEMU Sparc32 DMA controller emulation
  *
  * Copyright (c) 2006 Fabrice Bellard
  *
  * Modifications:
  *  2010-Feb-14 Artyom Tarasenko : reworked irq generation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "qemu/osdep.h"
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "hw/sparc/sparc32_dma.h"
 #include "hw/sparc/sun4m_iommu.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
 #include "sysemu/dma.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "trace.h"

 /*
  * This is the DMA controller part of chip STP2000 (Master I/O), also
  * produced as NCR89C100. See
  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
  * and
  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
  */

 #define DMA_SIZE (4 * sizeof(uint32_t))
 /* We need the mask, because one instance of the device is not page
    aligned (ledma, start address 0x0010) */
 #define DMA_MASK (DMA_SIZE - 1)
 /* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */
 #define DMA_ETH_SIZE (8 * sizeof(uint32_t))
 #define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1)

 #define DMA_VER 0xa0000000
 #define DMA_INTR 1
 #define DMA_INTREN 0x10
 #define DMA_WRITE_MEM 0x100
 #define DMA_EN 0x200
 #define DMA_LOADED 0x04000000
 #define DMA_DRAIN_FIFO 0x40
 #define DMA_RESET 0x80

 /* XXX SCSI and ethernet should have different read-only bit masks */
 #define DMA_CSR_RO_MASK 0xfe000007

 enum {
     GPIO_RESET = 0,
     GPIO_DMA,
 };

 /* Note: on sparc, the lance 16 bit bus is swapped */
 void ledma_memory_read(void *opaque, hwaddr addr,
                        uint8_t *buf, int len, int do_bswap)
 {
     DMADeviceState *s = opaque;
     IOMMUState *is = (IOMMUState *)s->iommu;
     int i;

     addr |= s->dmaregs[3];
     trace_ledma_memory_read(addr, len);
     if (do_bswap) {
         dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
     } else {
         addr &= ~1;
         len &= ~1;
         dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
         for(i = 0; i < len; i += 2) {
             bswap16s((uint16_t *)(buf + i));
         }
     }
 }

 void ledma_memory_write(void *opaque, hwaddr addr,
                         uint8_t *buf, int len, int do_bswap)
 {
     DMADeviceState *s = opaque;
     IOMMUState *is = (IOMMUState *)s->iommu;
     int l, i;
     uint16_t tmp_buf[32];

     addr |= s->dmaregs[3];
     trace_ledma_memory_write(addr, len);
     if (do_bswap) {
         dma_memory_write(&is->iommu_as, addr, buf, len,
                          MEMTXATTRS_UNSPECIFIED);
     } else {
         addr &= ~1;
         len &= ~1;
         while (len > 0) {
             l = len;
             if (l > sizeof(tmp_buf))
                 l = sizeof(tmp_buf);
             for(i = 0; i < l; i += 2) {
                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
             }
             dma_memory_write(&is->iommu_as, addr, tmp_buf, l,
                              MEMTXATTRS_UNSPECIFIED);
             len -= l;
             buf += l;
             addr += l;
         }
     }
 }

 static void dma_set_irq(void *opaque, int irq, int level)
 {
     DMADeviceState *s = opaque;
     if (level) {
         s->dmaregs[0] |= DMA_INTR;
         if (s->dmaregs[0] & DMA_INTREN) {
             trace_sparc32_dma_set_irq_raise();
             qemu_irq_raise(s->irq);
         }
     } else {
         if (s->dmaregs[0] & DMA_INTR) {
             s->dmaregs[0] &= ~DMA_INTR;
             if (s->dmaregs[0] & DMA_INTREN) {
                 trace_sparc32_dma_set_irq_lower();
                 qemu_irq_lower(s->irq);
             }
         }
     }
 }

 void espdma_memory_read(void *opaque, uint8_t *buf, int len)
 {
     DMADeviceState *s = opaque;
     IOMMUState *is = (IOMMUState *)s->iommu;

     trace_espdma_memory_read(s->dmaregs[1], len);
     dma_memory_read(&is->iommu_as, s->dmaregs[1], buf, len,
                     MEMTXATTRS_UNSPECIFIED);
     s->dmaregs[1] += len;
 }

 void espdma_memory_write(void *opaque, uint8_t *buf, int len)
 {
     DMADeviceState *s = opaque;
     IOMMUState *is = (IOMMUState *)s->iommu;

     trace_espdma_memory_write(s->dmaregs[1], len);
     dma_memory_write(&is->iommu_as, s->dmaregs[1], buf, len,
                      MEMTXATTRS_UNSPECIFIED);
     s->dmaregs[1] += len;
 }

 static uint64_t dma_mem_read(void *opaque, hwaddr addr,
                              unsigned size)
 {
     DMADeviceState *s = opaque;
     uint32_t saddr;

     saddr = (addr & DMA_MASK) >> 2;
     trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
     return s->dmaregs[saddr];
 }

 static void dma_mem_write(void *opaque, hwaddr addr,
                           uint64_t val, unsigned size)
 {
     DMADeviceState *s = opaque;
     uint32_t saddr;

     saddr = (addr & DMA_MASK) >> 2;
     trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
     switch (saddr) {
     case 0:
         if (val & DMA_INTREN) {
             if (s->dmaregs[0] & DMA_INTR) {
                 trace_sparc32_dma_set_irq_raise();
                 qemu_irq_raise(s->irq);
             }
         } else {
             if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) {
                 trace_sparc32_dma_set_irq_lower();
                 qemu_irq_lower(s->irq);
             }
         }
         if (val & DMA_RESET) {
             qemu_irq_raise(s->gpio[GPIO_RESET]);
             qemu_irq_lower(s->gpio[GPIO_RESET]);
         } else if (val & DMA_DRAIN_FIFO) {
             val &= ~DMA_DRAIN_FIFO;
         } else if (val == 0)
             val = DMA_DRAIN_FIFO;

         if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
             trace_sparc32_dma_enable_raise();
             qemu_irq_raise(s->gpio[GPIO_DMA]);
         } else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
             trace_sparc32_dma_enable_lower();
             qemu_irq_lower(s->gpio[GPIO_DMA]);
         }

         val &= ~DMA_CSR_RO_MASK;
         val |= DMA_VER;
         s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val;
         break;
     case 1:
         s->dmaregs[0] |= DMA_LOADED;
         /* fall through */
     default:
         s->dmaregs[saddr] = val;
         break;
     }
 }

 static const MemoryRegionOps dma_mem_ops = {
     .read = dma_mem_read,
     .write = dma_mem_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,
     },
 };

 static void sparc32_dma_device_reset(DeviceState *d)
 {
     DMADeviceState *s = SPARC32_DMA_DEVICE(d);

     memset(s->dmaregs, 0, DMA_SIZE);
     s->dmaregs[0] = DMA_VER;
 }

 static const VMStateDescription vmstate_sparc32_dma_device = {
     .name ="sparc32_dma",
     .version_id = 2,
     .minimum_version_id = 2,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32_ARRAY(dmaregs, DMADeviceState, DMA_REGS),
         VMSTATE_END_OF_LIST()
     }
 };

 static void sparc32_dma_device_init(Object *obj)
 {
     DeviceState *dev = DEVICE(obj);
     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

     sysbus_init_irq(sbd, &s->irq);

     sysbus_init_mmio(sbd, &s->iomem);

     object_property_add_link(OBJECT(dev), "iommu", TYPE_SUN4M_IOMMU,
                              (Object **) &s->iommu,
                              qdev_prop_allow_set_link_before_realize,
                              0);

     qdev_init_gpio_in(dev, dma_set_irq, 1);
     qdev_init_gpio_out(dev, s->gpio, 2);
 }

 static void sparc32_dma_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     device_class_set_legacy_reset(dc, sparc32_dma_device_reset);
     dc->vmsd = &vmstate_sparc32_dma_device;
 }

 static const TypeInfo sparc32_dma_device_info = {
     .name          = TYPE_SPARC32_DMA_DEVICE,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .abstract      = true,
     .instance_size = sizeof(DMADeviceState),
     .instance_init = sparc32_dma_device_init,
     .class_init    = sparc32_dma_device_class_init,
 };

 static void sparc32_espdma_device_init(Object *obj)
 {
     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
     ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(obj);

     memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
                           "espdma-mmio", DMA_SIZE);

     object_initialize_child(obj, "esp", &es->esp, TYPE_SYSBUS_ESP);
 }

 static void sparc32_espdma_device_realize(DeviceState *dev, Error **errp)
 {
     ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(dev);
     SysBusESPState *sysbus = SYSBUS_ESP(&es->esp);
     ESPState *esp = &sysbus->esp;

     esp->dma_memory_read = espdma_memory_read;
     esp->dma_memory_write = espdma_memory_write;
     esp->dma_opaque = SPARC32_DMA_DEVICE(dev);
     sysbus->it_shift = 2;
     esp->dma_enabled = 1;
     sysbus_realize(SYS_BUS_DEVICE(sysbus), &error_fatal);
 }

 static void sparc32_espdma_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = sparc32_espdma_device_realize;
 }

 static const TypeInfo sparc32_espdma_device_info = {
     .name          = TYPE_SPARC32_ESPDMA_DEVICE,
     .parent        = TYPE_SPARC32_DMA_DEVICE,
     .instance_size = sizeof(ESPDMADeviceState),
     .instance_init = sparc32_espdma_device_init,
     .class_init    = sparc32_espdma_device_class_init,
 };

 static void sparc32_ledma_device_init(Object *obj)
 {
     DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
     LEDMADeviceState *ls = SPARC32_LEDMA_DEVICE(obj);

     memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
                           "ledma-mmio", DMA_SIZE);

     object_initialize_child(obj, "lance", &ls->lance, TYPE_LANCE);
 }

 static void sparc32_ledma_device_realize(DeviceState *dev, Error **errp)
 {
     LEDMADeviceState *s = SPARC32_LEDMA_DEVICE(dev);
     SysBusPCNetState *lance = SYSBUS_PCNET(&s->lance);

     object_property_set_link(OBJECT(lance), "dma", OBJECT(dev), &error_abort);
     sysbus_realize(SYS_BUS_DEVICE(lance), &error_fatal);
 }

 static void sparc32_ledma_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = sparc32_ledma_device_realize;
 }

 static const TypeInfo sparc32_ledma_device_info = {
     .name          = TYPE_SPARC32_LEDMA_DEVICE,
     .parent        = TYPE_SPARC32_DMA_DEVICE,
     .instance_size = sizeof(LEDMADeviceState),
     .instance_init = sparc32_ledma_device_init,
     .class_init    = sparc32_ledma_device_class_init,
 };

 static void sparc32_dma_realize(DeviceState *dev, Error **errp)
 {
     SPARC32DMAState *s = SPARC32_DMA(dev);
     DeviceState *espdma, *esp, *ledma, *lance;
     SysBusDevice *sbd;
     Object *iommu;

     iommu = object_resolve_path_type("", TYPE_SUN4M_IOMMU, NULL);
     if (!iommu) {
         error_setg(errp, "unable to locate sun4m IOMMU device");
         return;
     }

     espdma = DEVICE(&s->espdma);
     object_property_set_link(OBJECT(espdma), "iommu", iommu, &error_abort);
     sysbus_realize(SYS_BUS_DEVICE(espdma), &error_fatal);

     esp = DEVICE(object_resolve_path_component(OBJECT(espdma), "esp"));
     sbd = SYS_BUS_DEVICE(esp);
     sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(espdma, 0));
     qdev_connect_gpio_out(espdma, 0, qdev_get_gpio_in(esp, 0));
     qdev_connect_gpio_out(espdma, 1, qdev_get_gpio_in(esp, 1));

     sbd = SYS_BUS_DEVICE(espdma);
     memory_region_add_subregion(&s->dmamem, 0x0,
                                 sysbus_mmio_get_region(sbd, 0));

     ledma = DEVICE(&s->ledma);
     object_property_set_link(OBJECT(ledma), "iommu", iommu, &error_abort);
     sysbus_realize(SYS_BUS_DEVICE(ledma), &error_fatal);

     lance = DEVICE(object_resolve_path_component(OBJECT(ledma), "lance"));
     sbd = SYS_BUS_DEVICE(lance);
     sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(ledma, 0));
     qdev_connect_gpio_out(ledma, 0, qdev_get_gpio_in(lance, 0));

     sbd = SYS_BUS_DEVICE(ledma);
     memory_region_add_subregion(&s->dmamem, 0x10,
                                 sysbus_mmio_get_region(sbd, 0));

     /* Add ledma alias to handle SunOS 5.7 - Solaris 9 invalid access bug */
     memory_region_init_alias(&s->ledma_alias, OBJECT(dev), "ledma-alias",
                              sysbus_mmio_get_region(sbd, 0), 0x4, 0x4);
     memory_region_add_subregion(&s->dmamem, 0x20, &s->ledma_alias);
 }

 static void sparc32_dma_init(Object *obj)
 {
     SPARC32DMAState *s = SPARC32_DMA(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

     memory_region_init(&s->dmamem, OBJECT(s), "dma", DMA_SIZE + DMA_ETH_SIZE);
     sysbus_init_mmio(sbd, &s->dmamem);

     object_initialize_child(obj, "espdma", &s->espdma,
                             TYPE_SPARC32_ESPDMA_DEVICE);
     object_initialize_child(obj, "ledma", &s->ledma,
                             TYPE_SPARC32_LEDMA_DEVICE);
 }

 static void sparc32_dma_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = sparc32_dma_realize;
 }

 static const TypeInfo sparc32_dma_info = {
     .name          = TYPE_SPARC32_DMA,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(SPARC32DMAState),
     .instance_init = sparc32_dma_init,
     .class_init    = sparc32_dma_class_init,
 };


 static void sparc32_dma_register_types(void)
 {
     type_register_static(&sparc32_dma_device_info);
     type_register_static(&sparc32_espdma_device_info);
     type_register_static(&sparc32_ledma_device_info);
     type_register_static(&sparc32_dma_info);
 }

 type_init(sparc32_dma_register_types)
	/*
	* QEMU Sparc32 DMA controller emulation
	*
	* Copyright (c) 2006 Fabrice Bellard
	*
	* Modifications:
	* 2010-Feb-14 Artyom Tarasenko : reworked irq generation
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "qemu/osdep.h"
	#include "hw/irq.h"
	#include "hw/qdev-properties.h"
	#include "hw/sparc/sparc32_dma.h"
	#include "hw/sparc/sun4m_iommu.h"
	#include "hw/sysbus.h"
	#include "migration/vmstate.h"
	#include "sysemu/dma.h"
	#include "qapi/error.h"
	#include "qemu/module.h"
	#include "trace.h"

	/*
	* This is the DMA controller part of chip STP2000 (Master I/O), also
	* produced as NCR89C100. See
	* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
	* and
	* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
	*/

	#define DMA_SIZE (4 * sizeof(uint32_t))
	/* We need the mask, because one instance of the device is not page
	aligned (ledma, start address 0x0010) */
	#define DMA_MASK (DMA_SIZE - 1)
	/* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */
	#define DMA_ETH_SIZE (8 * sizeof(uint32_t))
	#define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1)

	#define DMA_VER 0xa0000000
	#define DMA_INTR 1
	#define DMA_INTREN 0x10
	#define DMA_WRITE_MEM 0x100
	#define DMA_EN 0x200
	#define DMA_LOADED 0x04000000
	#define DMA_DRAIN_FIFO 0x40
	#define DMA_RESET 0x80

	/* XXX SCSI and ethernet should have different read-only bit masks */
	#define DMA_CSR_RO_MASK 0xfe000007

	enum {
	GPIO_RESET = 0,
	GPIO_DMA,
	};

	/* Note: on sparc, the lance 16 bit bus is swapped */
	void ledma_memory_read(void *opaque, hwaddr addr,
	uint8_t *buf, int len, int do_bswap)
	{
	DMADeviceState *s = opaque;
	IOMMUState is = (IOMMUState )s->iommu;
	int i;

	addr \|= s->dmaregs[3];
	trace_ledma_memory_read(addr, len);
	if (do_bswap) {
	dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
	} else {
	addr &= ~1;
	len &= ~1;
	dma_memory_read(&is->iommu_as, addr, buf, len, MEMTXATTRS_UNSPECIFIED);
	for(i = 0; i < len; i += 2) {
	bswap16s((uint16_t *)(buf + i));
	}
	}
	}

	void ledma_memory_write(void *opaque, hwaddr addr,
	uint8_t *buf, int len, int do_bswap)
	{
	DMADeviceState *s = opaque;
	IOMMUState is = (IOMMUState )s->iommu;
	int l, i;
	uint16_t tmp_buf[32];

	addr \|= s->dmaregs[3];
	trace_ledma_memory_write(addr, len);
	if (do_bswap) {
	dma_memory_write(&is->iommu_as, addr, buf, len,
	MEMTXATTRS_UNSPECIFIED);
	} else {
	addr &= ~1;
	len &= ~1;
	while (len > 0) {
	l = len;
	if (l > sizeof(tmp_buf))
	l = sizeof(tmp_buf);
	for(i = 0; i < l; i += 2) {
	tmp_buf[i >> 1] = bswap16((uint16_t )(buf + i));
	}
	dma_memory_write(&is->iommu_as, addr, tmp_buf, l,
	MEMTXATTRS_UNSPECIFIED);
	len -= l;
	buf += l;
	addr += l;
	}
	}
	}

	static void dma_set_irq(void *opaque, int irq, int level)
	{
	DMADeviceState *s = opaque;
	if (level) {
	s->dmaregs[0] \|= DMA_INTR;
	if (s->dmaregs[0] & DMA_INTREN) {
	trace_sparc32_dma_set_irq_raise();
	qemu_irq_raise(s->irq);
	}
	} else {
	if (s->dmaregs[0] & DMA_INTR) {
	s->dmaregs[0] &= ~DMA_INTR;
	if (s->dmaregs[0] & DMA_INTREN) {
	trace_sparc32_dma_set_irq_lower();
	qemu_irq_lower(s->irq);
	}
	}
	}
	}

	void espdma_memory_read(void opaque, uint8_t buf, int len)
	{
	DMADeviceState *s = opaque;
	IOMMUState is = (IOMMUState )s->iommu;

	trace_espdma_memory_read(s->dmaregs[1], len);
	dma_memory_read(&is->iommu_as, s->dmaregs[1], buf, len,
	MEMTXATTRS_UNSPECIFIED);
	s->dmaregs[1] += len;
	}

	void espdma_memory_write(void opaque, uint8_t buf, int len)
	{
	DMADeviceState *s = opaque;
	IOMMUState is = (IOMMUState )s->iommu;

	trace_espdma_memory_write(s->dmaregs[1], len);
	dma_memory_write(&is->iommu_as, s->dmaregs[1], buf, len,
	MEMTXATTRS_UNSPECIFIED);
	s->dmaregs[1] += len;
	}

	static uint64_t dma_mem_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	DMADeviceState *s = opaque;
	uint32_t saddr;

	saddr = (addr & DMA_MASK) >> 2;
	trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]);
	return s->dmaregs[saddr];
	}

	static void dma_mem_write(void *opaque, hwaddr addr,
	uint64_t val, unsigned size)
	{
	DMADeviceState *s = opaque;
	uint32_t saddr;

	saddr = (addr & DMA_MASK) >> 2;
	trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val);
	switch (saddr) {
	case 0:
	if (val & DMA_INTREN) {
	if (s->dmaregs[0] & DMA_INTR) {
	trace_sparc32_dma_set_irq_raise();
	qemu_irq_raise(s->irq);
	}
	} else {
	if (s->dmaregs[0] & (DMA_INTR \| DMA_INTREN)) {
	trace_sparc32_dma_set_irq_lower();
	qemu_irq_lower(s->irq);
	}
	}
	if (val & DMA_RESET) {
	qemu_irq_raise(s->gpio[GPIO_RESET]);
	qemu_irq_lower(s->gpio[GPIO_RESET]);
	} else if (val & DMA_DRAIN_FIFO) {
	val &= ~DMA_DRAIN_FIFO;
	} else if (val == 0)
	val = DMA_DRAIN_FIFO;

	if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) {
	trace_sparc32_dma_enable_raise();
	qemu_irq_raise(s->gpio[GPIO_DMA]);
	} else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) {
	trace_sparc32_dma_enable_lower();
	qemu_irq_lower(s->gpio[GPIO_DMA]);
	}

	val &= ~DMA_CSR_RO_MASK;
	val \|= DMA_VER;
	s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) \| val;
	break;
	case 1:
	s->dmaregs[0] \|= DMA_LOADED;
	/* fall through */
	default:
	s->dmaregs[saddr] = val;
	break;
	}
	}

	static const MemoryRegionOps dma_mem_ops = {
	.read = dma_mem_read,
	.write = dma_mem_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid = {
	.min_access_size = 4,
	.max_access_size = 4,
	},
	};

	static void sparc32_dma_device_reset(DeviceState *d)
	{
	DMADeviceState *s = SPARC32_DMA_DEVICE(d);

	memset(s->dmaregs, 0, DMA_SIZE);
	s->dmaregs[0] = DMA_VER;
	}

	static const VMStateDescription vmstate_sparc32_dma_device = {
	.name ="sparc32_dma",
	.version_id = 2,
	.minimum_version_id = 2,
	.fields = (const VMStateField[]) {
	VMSTATE_UINT32_ARRAY(dmaregs, DMADeviceState, DMA_REGS),
	VMSTATE_END_OF_LIST()
	}
	};

	static void sparc32_dma_device_init(Object *obj)
	{
	DeviceState *dev = DEVICE(obj);
	DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

	sysbus_init_irq(sbd, &s->irq);

	sysbus_init_mmio(sbd, &s->iomem);

	object_property_add_link(OBJECT(dev), "iommu", TYPE_SUN4M_IOMMU,
	(Object **) &s->iommu,
	qdev_prop_allow_set_link_before_realize,
	0);

	qdev_init_gpio_in(dev, dma_set_irq, 1);
	qdev_init_gpio_out(dev, s->gpio, 2);
	}

	static void sparc32_dma_device_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	device_class_set_legacy_reset(dc, sparc32_dma_device_reset);
	dc->vmsd = &vmstate_sparc32_dma_device;
	}

	static const TypeInfo sparc32_dma_device_info = {
	.name = TYPE_SPARC32_DMA_DEVICE,
	.parent = TYPE_SYS_BUS_DEVICE,
	.abstract = true,
	.instance_size = sizeof(DMADeviceState),
	.instance_init = sparc32_dma_device_init,
	.class_init = sparc32_dma_device_class_init,
	};

	static void sparc32_espdma_device_init(Object *obj)
	{
	DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
	ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(obj);

	memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
	"espdma-mmio", DMA_SIZE);

	object_initialize_child(obj, "esp", &es->esp, TYPE_SYSBUS_ESP);
	}

	static void sparc32_espdma_device_realize(DeviceState dev, Error *errp)
	{
	ESPDMADeviceState *es = SPARC32_ESPDMA_DEVICE(dev);
	SysBusESPState *sysbus = SYSBUS_ESP(&es->esp);
	ESPState *esp = &sysbus->esp;

	esp->dma_memory_read = espdma_memory_read;
	esp->dma_memory_write = espdma_memory_write;
	esp->dma_opaque = SPARC32_DMA_DEVICE(dev);
	sysbus->it_shift = 2;
	esp->dma_enabled = 1;
	sysbus_realize(SYS_BUS_DEVICE(sysbus), &error_fatal);
	}

	static void sparc32_espdma_device_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = sparc32_espdma_device_realize;
	}

	static const TypeInfo sparc32_espdma_device_info = {
	.name = TYPE_SPARC32_ESPDMA_DEVICE,
	.parent = TYPE_SPARC32_DMA_DEVICE,
	.instance_size = sizeof(ESPDMADeviceState),
	.instance_init = sparc32_espdma_device_init,
	.class_init = sparc32_espdma_device_class_init,
	};

	static void sparc32_ledma_device_init(Object *obj)
	{
	DMADeviceState *s = SPARC32_DMA_DEVICE(obj);
	LEDMADeviceState *ls = SPARC32_LEDMA_DEVICE(obj);

	memory_region_init_io(&s->iomem, OBJECT(s), &dma_mem_ops, s,
	"ledma-mmio", DMA_SIZE);

	object_initialize_child(obj, "lance", &ls->lance, TYPE_LANCE);
	}

	static void sparc32_ledma_device_realize(DeviceState dev, Error *errp)
	{
	LEDMADeviceState *s = SPARC32_LEDMA_DEVICE(dev);
	SysBusPCNetState *lance = SYSBUS_PCNET(&s->lance);

	object_property_set_link(OBJECT(lance), "dma", OBJECT(dev), &error_abort);
	sysbus_realize(SYS_BUS_DEVICE(lance), &error_fatal);
	}

	static void sparc32_ledma_device_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = sparc32_ledma_device_realize;
	}

	static const TypeInfo sparc32_ledma_device_info = {
	.name = TYPE_SPARC32_LEDMA_DEVICE,
	.parent = TYPE_SPARC32_DMA_DEVICE,
	.instance_size = sizeof(LEDMADeviceState),
	.instance_init = sparc32_ledma_device_init,
	.class_init = sparc32_ledma_device_class_init,
	};

	static void sparc32_dma_realize(DeviceState dev, Error *errp)
	{
	SPARC32DMAState *s = SPARC32_DMA(dev);
	DeviceState espdma, esp, ledma, lance;
	SysBusDevice *sbd;
	Object *iommu;

	iommu = object_resolve_path_type("", TYPE_SUN4M_IOMMU, NULL);
	if (!iommu) {
	error_setg(errp, "unable to locate sun4m IOMMU device");
	return;
	}

	espdma = DEVICE(&s->espdma);
	object_property_set_link(OBJECT(espdma), "iommu", iommu, &error_abort);
	sysbus_realize(SYS_BUS_DEVICE(espdma), &error_fatal);

	esp = DEVICE(object_resolve_path_component(OBJECT(espdma), "esp"));
	sbd = SYS_BUS_DEVICE(esp);
	sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(espdma, 0));
	qdev_connect_gpio_out(espdma, 0, qdev_get_gpio_in(esp, 0));
	qdev_connect_gpio_out(espdma, 1, qdev_get_gpio_in(esp, 1));

	sbd = SYS_BUS_DEVICE(espdma);
	memory_region_add_subregion(&s->dmamem, 0x0,
	sysbus_mmio_get_region(sbd, 0));

	ledma = DEVICE(&s->ledma);
	object_property_set_link(OBJECT(ledma), "iommu", iommu, &error_abort);
	sysbus_realize(SYS_BUS_DEVICE(ledma), &error_fatal);

	lance = DEVICE(object_resolve_path_component(OBJECT(ledma), "lance"));
	sbd = SYS_BUS_DEVICE(lance);
	sysbus_connect_irq(sbd, 0, qdev_get_gpio_in(ledma, 0));
	qdev_connect_gpio_out(ledma, 0, qdev_get_gpio_in(lance, 0));

	sbd = SYS_BUS_DEVICE(ledma);
	memory_region_add_subregion(&s->dmamem, 0x10,
	sysbus_mmio_get_region(sbd, 0));

	/* Add ledma alias to handle SunOS 5.7 - Solaris 9 invalid access bug */
	memory_region_init_alias(&s->ledma_alias, OBJECT(dev), "ledma-alias",
	sysbus_mmio_get_region(sbd, 0), 0x4, 0x4);
	memory_region_add_subregion(&s->dmamem, 0x20, &s->ledma_alias);
	}

	static void sparc32_dma_init(Object *obj)
	{
	SPARC32DMAState *s = SPARC32_DMA(obj);
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

	memory_region_init(&s->dmamem, OBJECT(s), "dma", DMA_SIZE + DMA_ETH_SIZE);
	sysbus_init_mmio(sbd, &s->dmamem);

	object_initialize_child(obj, "espdma", &s->espdma,
	TYPE_SPARC32_ESPDMA_DEVICE);
	object_initialize_child(obj, "ledma", &s->ledma,
	TYPE_SPARC32_LEDMA_DEVICE);
	}

	static void sparc32_dma_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = sparc32_dma_realize;
	}

	static const TypeInfo sparc32_dma_info = {
	.name = TYPE_SPARC32_DMA,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(SPARC32DMAState),
	.instance_init = sparc32_dma_init,
	.class_init = sparc32_dma_class_init,
	};


	static void sparc32_dma_register_types(void)
	{
	type_register_static(&sparc32_dma_device_info);
	type_register_static(&sparc32_espdma_device_info);
	type_register_static(&sparc32_ledma_device_info);
	type_register_static(&sparc32_dma_info);
	}

	type_init(sparc32_dma_register_types)