hw/misc/bcm2835_property.c - qemu - Git at Google

 /*
  * Raspberry Pi emulation (c) 2012 Gregory Estrade
  * This code is licensed under the GNU GPLv2 and later.
  */

 #include "qemu/osdep.h"
 #include "hw/misc/bcm2835_property.h"
 #include "hw/misc/bcm2835_mbox_defs.h"
 #include "sysemu/dma.h"

 /* https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface */

 static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
 {
     uint32_t tag;
     uint32_t bufsize;
     uint32_t tot_len;
     size_t resplen;
     uint32_t tmp;

     value &= ~0xf;

     s->addr = value;

     tot_len = ldl_le_phys(&s->dma_as, value);

     /* @(addr + 4) : Buffer response code */
     value = s->addr + 8;
     while (value + 8 <= s->addr + tot_len) {
         tag = ldl_le_phys(&s->dma_as, value);
         bufsize = ldl_le_phys(&s->dma_as, value + 4);
         /* @(value + 8) : Request/response indicator */
         resplen = 0;
         switch (tag) {
         case 0x00000000: /* End tag */
             break;
         case 0x00000001: /* Get firmware revision */
             stl_le_phys(&s->dma_as, value + 12, 346337);
             resplen = 4;
             break;
         case 0x00010001: /* Get board model */
             qemu_log_mask(LOG_UNIMP,
                           "bcm2835_property: %x get board model NYI\n", tag);
             resplen = 4;
             break;
         case 0x00010002: /* Get board revision */
             stl_le_phys(&s->dma_as, value + 12, s->board_rev);
             resplen = 4;
             break;
         case 0x00010003: /* Get board MAC address */
             resplen = sizeof(s->macaddr.a);
             dma_memory_write(&s->dma_as, value + 12, s->macaddr.a, resplen);
             break;
         case 0x00010004: /* Get board serial */
             qemu_log_mask(LOG_UNIMP,
                           "bcm2835_property: %x get board serial NYI\n", tag);
             resplen = 8;
             break;
         case 0x00010005: /* Get ARM memory */
             /* base */
             stl_le_phys(&s->dma_as, value + 12, 0);
             /* size */
             stl_le_phys(&s->dma_as, value + 16, s->ram_size);
             resplen = 8;
             break;
         case 0x00028001: /* Set power state */
             /* Assume that whatever device they asked for exists,
              * and we'll just claim we set it to the desired state
              */
             tmp = ldl_le_phys(&s->dma_as, value + 16);
             stl_le_phys(&s->dma_as, value + 16, (tmp & 1));
             resplen = 8;
             break;

         /* Clocks */

         case 0x00030001: /* Get clock state */
             stl_le_phys(&s->dma_as, value + 16, 0x1);
             resplen = 8;
             break;

         case 0x00038001: /* Set clock state */
             qemu_log_mask(LOG_UNIMP,
                           "bcm2835_property: %x set clock state NYI\n", tag);
             resplen = 8;
             break;

         case 0x00030002: /* Get clock rate */
         case 0x00030004: /* Get max clock rate */
         case 0x00030007: /* Get min clock rate */
             switch (ldl_le_phys(&s->dma_as, value + 12)) {
             case 1: /* EMMC */
                 stl_le_phys(&s->dma_as, value + 16, 50000000);
                 break;
             case 2: /* UART */
                 stl_le_phys(&s->dma_as, value + 16, 3000000);
                 break;
             default:
                 stl_le_phys(&s->dma_as, value + 16, 700000000);
                 break;
             }
             resplen = 8;
             break;

         case 0x00038002: /* Set clock rate */
         case 0x00038004: /* Set max clock rate */
         case 0x00038007: /* Set min clock rate */
             qemu_log_mask(LOG_UNIMP,
                           "bcm2835_property: %x set clock rates NYI\n", tag);
             resplen = 8;
             break;

         /* Temperature */

         case 0x00030006: /* Get temperature */
             stl_le_phys(&s->dma_as, value + 16, 25000);
             resplen = 8;
             break;

         case 0x0003000A: /* Get max temperature */
             stl_le_phys(&s->dma_as, value + 16, 99000);
             resplen = 8;
             break;


         case 0x00060001: /* Get DMA channels */
             /* channels 2-5 */
             stl_le_phys(&s->dma_as, value + 12, 0x003C);
             resplen = 4;
             break;

         case 0x00050001: /* Get command line */
             resplen = 0;
             break;

         default:
             qemu_log_mask(LOG_GUEST_ERROR,
                           "bcm2835_property: unhandled tag %08x\n", tag);
             break;
         }

         if (tag == 0) {
             break;
         }

         stl_le_phys(&s->dma_as, value + 8, (1 << 31) | resplen);
         value += bufsize + 12;
     }

     /* Buffer response code */
     stl_le_phys(&s->dma_as, s->addr + 4, (1 << 31));
 }

 static uint64_t bcm2835_property_read(void *opaque, hwaddr offset,
                                       unsigned size)
 {
     BCM2835PropertyState *s = opaque;
     uint32_t res = 0;

     switch (offset) {
     case MBOX_AS_DATA:
         res = MBOX_CHAN_PROPERTY | s->addr;
         s->pending = false;
         qemu_set_irq(s->mbox_irq, 0);
         break;

     case MBOX_AS_PENDING:
         res = s->pending;
         break;

     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
                       __func__, offset);
         return 0;
     }

     return res;
 }

 static void bcm2835_property_write(void *opaque, hwaddr offset,
                                    uint64_t value, unsigned size)
 {
     BCM2835PropertyState *s = opaque;

     switch (offset) {
     case MBOX_AS_DATA:
         /* bcm2835_mbox should check our pending status before pushing */
         assert(!s->pending);
         s->pending = true;
         bcm2835_property_mbox_push(s, value);
         qemu_set_irq(s->mbox_irq, 1);
         break;

     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
                       __func__, offset);
         return;
     }
 }

 static const MemoryRegionOps bcm2835_property_ops = {
     .read = bcm2835_property_read,
     .write = bcm2835_property_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
 };

 static const VMStateDescription vmstate_bcm2835_property = {
     .name = TYPE_BCM2835_PROPERTY,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields      = (VMStateField[]) {
         VMSTATE_MACADDR(macaddr, BCM2835PropertyState),
         VMSTATE_UINT32(addr, BCM2835PropertyState),
         VMSTATE_BOOL(pending, BCM2835PropertyState),
         VMSTATE_END_OF_LIST()
     }
 };

 static void bcm2835_property_init(Object *obj)
 {
     BCM2835PropertyState *s = BCM2835_PROPERTY(obj);

     memory_region_init_io(&s->iomem, OBJECT(s), &bcm2835_property_ops, s,
                           TYPE_BCM2835_PROPERTY, 0x10);
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
 }

 static void bcm2835_property_reset(DeviceState *dev)
 {
     BCM2835PropertyState *s = BCM2835_PROPERTY(dev);

     s->pending = false;
 }

 static void bcm2835_property_realize(DeviceState *dev, Error **errp)
 {
     BCM2835PropertyState *s = BCM2835_PROPERTY(dev);
     Object *obj;
     Error *err = NULL;

     obj = object_property_get_link(OBJECT(dev), "dma-mr", &err);
     if (obj == NULL) {
         error_setg(errp, "%s: required dma-mr link not found: %s",
                    __func__, error_get_pretty(err));
         return;
     }

     s->dma_mr = MEMORY_REGION(obj);
     address_space_init(&s->dma_as, s->dma_mr, NULL);

     /* TODO: connect to MAC address of USB NIC device, once we emulate it */
     qemu_macaddr_default_if_unset(&s->macaddr);

     bcm2835_property_reset(dev);
 }

 static Property bcm2835_property_props[] = {
     DEFINE_PROP_UINT32("board-rev", BCM2835PropertyState, board_rev, 0),
     DEFINE_PROP_UINT32("ram-size", BCM2835PropertyState, ram_size, 0),
     DEFINE_PROP_END_OF_LIST()
 };

 static void bcm2835_property_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->props = bcm2835_property_props;
     dc->realize = bcm2835_property_realize;
     dc->vmsd = &vmstate_bcm2835_property;
 }

 static TypeInfo bcm2835_property_info = {
     .name          = TYPE_BCM2835_PROPERTY,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(BCM2835PropertyState),
     .class_init    = bcm2835_property_class_init,
     .instance_init = bcm2835_property_init,
 };

 static void bcm2835_property_register_types(void)
 {
     type_register_static(&bcm2835_property_info);
 }

 type_init(bcm2835_property_register_types)
	/*
	* Raspberry Pi emulation (c) 2012 Gregory Estrade
	* This code is licensed under the GNU GPLv2 and later.
	*/

	#include "qemu/osdep.h"
	#include "hw/misc/bcm2835_property.h"
	#include "hw/misc/bcm2835_mbox_defs.h"
	#include "sysemu/dma.h"

	/* https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface */

	static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
	{
	uint32_t tag;
	uint32_t bufsize;
	uint32_t tot_len;
	size_t resplen;
	uint32_t tmp;

	value &= ~0xf;

	s->addr = value;

	tot_len = ldl_le_phys(&s->dma_as, value);

	/* @(addr + 4) : Buffer response code */
	value = s->addr + 8;
	while (value + 8 <= s->addr + tot_len) {
	tag = ldl_le_phys(&s->dma_as, value);
	bufsize = ldl_le_phys(&s->dma_as, value + 4);
	/* @(value + 8) : Request/response indicator */
	resplen = 0;
	switch (tag) {
	case 0x00000000: /* End tag */
	break;
	case 0x00000001: /* Get firmware revision */
	stl_le_phys(&s->dma_as, value + 12, 346337);
	resplen = 4;
	break;
	case 0x00010001: /* Get board model */
	qemu_log_mask(LOG_UNIMP,
	"bcm2835_property: %x get board model NYI\n", tag);
	resplen = 4;
	break;
	case 0x00010002: /* Get board revision */
	stl_le_phys(&s->dma_as, value + 12, s->board_rev);
	resplen = 4;
	break;
	case 0x00010003: /* Get board MAC address */
	resplen = sizeof(s->macaddr.a);
	dma_memory_write(&s->dma_as, value + 12, s->macaddr.a, resplen);
	break;
	case 0x00010004: /* Get board serial */
	qemu_log_mask(LOG_UNIMP,
	"bcm2835_property: %x get board serial NYI\n", tag);
	resplen = 8;
	break;
	case 0x00010005: /* Get ARM memory */
	/* base */
	stl_le_phys(&s->dma_as, value + 12, 0);
	/* size */
	stl_le_phys(&s->dma_as, value + 16, s->ram_size);
	resplen = 8;
	break;
	case 0x00028001: /* Set power state */
	/* Assume that whatever device they asked for exists,
	* and we'll just claim we set it to the desired state
	*/
	tmp = ldl_le_phys(&s->dma_as, value + 16);
	stl_le_phys(&s->dma_as, value + 16, (tmp & 1));
	resplen = 8;
	break;

	/* Clocks */

	case 0x00030001: /* Get clock state */
	stl_le_phys(&s->dma_as, value + 16, 0x1);
	resplen = 8;
	break;

	case 0x00038001: /* Set clock state */
	qemu_log_mask(LOG_UNIMP,
	"bcm2835_property: %x set clock state NYI\n", tag);
	resplen = 8;
	break;

	case 0x00030002: /* Get clock rate */
	case 0x00030004: /* Get max clock rate */
	case 0x00030007: /* Get min clock rate */
	switch (ldl_le_phys(&s->dma_as, value + 12)) {
	case 1: /* EMMC */
	stl_le_phys(&s->dma_as, value + 16, 50000000);
	break;
	case 2: /* UART */
	stl_le_phys(&s->dma_as, value + 16, 3000000);
	break;
	default:
	stl_le_phys(&s->dma_as, value + 16, 700000000);
	break;
	}
	resplen = 8;
	break;

	case 0x00038002: /* Set clock rate */
	case 0x00038004: /* Set max clock rate */
	case 0x00038007: /* Set min clock rate */
	qemu_log_mask(LOG_UNIMP,
	"bcm2835_property: %x set clock rates NYI\n", tag);
	resplen = 8;
	break;

	/* Temperature */

	case 0x00030006: /* Get temperature */
	stl_le_phys(&s->dma_as, value + 16, 25000);
	resplen = 8;
	break;

	case 0x0003000A: /* Get max temperature */
	stl_le_phys(&s->dma_as, value + 16, 99000);
	resplen = 8;
	break;


	case 0x00060001: /* Get DMA channels */
	/* channels 2-5 */
	stl_le_phys(&s->dma_as, value + 12, 0x003C);
	resplen = 4;
	break;

	case 0x00050001: /* Get command line */
	resplen = 0;
	break;

	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"bcm2835_property: unhandled tag %08x\n", tag);
	break;
	}

	if (tag == 0) {
	break;
	}

	stl_le_phys(&s->dma_as, value + 8, (1 << 31) \| resplen);
	value += bufsize + 12;
	}

	/* Buffer response code */
	stl_le_phys(&s->dma_as, s->addr + 4, (1 << 31));
	}

	static uint64_t bcm2835_property_read(void *opaque, hwaddr offset,
	unsigned size)
	{
	BCM2835PropertyState *s = opaque;
	uint32_t res = 0;

	switch (offset) {
	case MBOX_AS_DATA:
	res = MBOX_CHAN_PROPERTY \| s->addr;
	s->pending = false;
	qemu_set_irq(s->mbox_irq, 0);
	break;

	case MBOX_AS_PENDING:
	res = s->pending;
	break;

	default:
	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
	__func__, offset);
	return 0;
	}

	return res;
	}

	static void bcm2835_property_write(void *opaque, hwaddr offset,
	uint64_t value, unsigned size)
	{
	BCM2835PropertyState *s = opaque;

	switch (offset) {
	case MBOX_AS_DATA:
	/* bcm2835_mbox should check our pending status before pushing */
	assert(!s->pending);
	s->pending = true;
	bcm2835_property_mbox_push(s, value);
	qemu_set_irq(s->mbox_irq, 1);
	break;

	default:
	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
	__func__, offset);
	return;
	}
	}

	static const MemoryRegionOps bcm2835_property_ops = {
	.read = bcm2835_property_read,
	.write = bcm2835_property_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid.min_access_size = 4,
	.valid.max_access_size = 4,
	};

	static const VMStateDescription vmstate_bcm2835_property = {
	.name = TYPE_BCM2835_PROPERTY,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_MACADDR(macaddr, BCM2835PropertyState),
	VMSTATE_UINT32(addr, BCM2835PropertyState),
	VMSTATE_BOOL(pending, BCM2835PropertyState),
	VMSTATE_END_OF_LIST()
	}
	};

	static void bcm2835_property_init(Object *obj)
	{
	BCM2835PropertyState *s = BCM2835_PROPERTY(obj);

	memory_region_init_io(&s->iomem, OBJECT(s), &bcm2835_property_ops, s,
	TYPE_BCM2835_PROPERTY, 0x10);
	sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
	sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
	}

	static void bcm2835_property_reset(DeviceState *dev)
	{
	BCM2835PropertyState *s = BCM2835_PROPERTY(dev);

	s->pending = false;
	}

	static void bcm2835_property_realize(DeviceState dev, Error *errp)
	{
	BCM2835PropertyState *s = BCM2835_PROPERTY(dev);
	Object *obj;
	Error *err = NULL;

	obj = object_property_get_link(OBJECT(dev), "dma-mr", &err);
	if (obj == NULL) {
	error_setg(errp, "%s: required dma-mr link not found: %s",
	__func__, error_get_pretty(err));
	return;
	}

	s->dma_mr = MEMORY_REGION(obj);
	address_space_init(&s->dma_as, s->dma_mr, NULL);

	/* TODO: connect to MAC address of USB NIC device, once we emulate it */
	qemu_macaddr_default_if_unset(&s->macaddr);

	bcm2835_property_reset(dev);
	}

	static Property bcm2835_property_props[] = {
	DEFINE_PROP_UINT32("board-rev", BCM2835PropertyState, board_rev, 0),
	DEFINE_PROP_UINT32("ram-size", BCM2835PropertyState, ram_size, 0),
	DEFINE_PROP_END_OF_LIST()
	};

	static void bcm2835_property_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->props = bcm2835_property_props;
	dc->realize = bcm2835_property_realize;
	dc->vmsd = &vmstate_bcm2835_property;
	}

	static TypeInfo bcm2835_property_info = {
	.name = TYPE_BCM2835_PROPERTY,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(BCM2835PropertyState),
	.class_init = bcm2835_property_class_init,
	.instance_init = bcm2835_property_init,
	};

	static void bcm2835_property_register_types(void)
	{
	type_register_static(&bcm2835_property_info);
	}

	type_init(bcm2835_property_register_types)