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qemu/hw/misc/bcm2835_property.c
Grégory ESTRADE 355a8ccc5c bcm2835_property: implement framebuffer control/configuration properties 
The property channel driver now interfaces with the framebuffer device
to query and set framebuffer parameters. As a result of this, the "get
ARM RAM size" query now correctly returns the video RAM base address
(not total RAM size), and the ram-size property is no longer relevant
here.

Signed-off-by: Grégory ESTRADE <gregory.estrade@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Message-id: 1457467526-8840-5-git-send-email-Andrew.Baumann@microsoft.com
[AB: cleanup/refactoring for upstream submission]
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-03-16 17:42:18 +00:00

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/*
* 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;
int n;
uint32_t offset, length, color;
uint32_t xres, yres, xoffset, yoffset, bpp, pixo, alpha;
uint32_t *newxres = NULL, *newyres = NULL, *newxoffset = NULL,
*newyoffset = NULL, *newbpp = NULL, *newpixo = NULL, *newalpha = NULL;
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->fbdev->vcram_base);
resplen = 8;
break;
case 0x00010006: /* Get VC memory */
/* base */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->vcram_base);
/* size */
stl_le_phys(&s->dma_as, value + 16, s->fbdev->vcram_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;
/* Frame buffer */
case 0x00040001: /* Allocate buffer */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->base);
stl_le_phys(&s->dma_as, value + 16, s->fbdev->size);
resplen = 8;
break;
case 0x00048001: /* Release buffer */
resplen = 0;
break;
case 0x00040002: /* Blank screen */
resplen = 4;
break;
case 0x00040003: /* Get display width/height */
case 0x00040004:
stl_le_phys(&s->dma_as, value + 12, s->fbdev->xres);
stl_le_phys(&s->dma_as, value + 16, s->fbdev->yres);
resplen = 8;
break;
case 0x00044003: /* Test display width/height */
case 0x00044004:
resplen = 8;
break;
case 0x00048003: /* Set display width/height */
case 0x00048004:
xres = ldl_le_phys(&s->dma_as, value + 12);
newxres = &xres;
yres = ldl_le_phys(&s->dma_as, value + 16);
newyres = &yres;
resplen = 8;
break;
case 0x00040005: /* Get depth */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->bpp);
resplen = 4;
break;
case 0x00044005: /* Test depth */
resplen = 4;
break;
case 0x00048005: /* Set depth */
bpp = ldl_le_phys(&s->dma_as, value + 12);
newbpp = &bpp;
resplen = 4;
break;
case 0x00040006: /* Get pixel order */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->pixo);
resplen = 4;
break;
case 0x00044006: /* Test pixel order */
resplen = 4;
break;
case 0x00048006: /* Set pixel order */
pixo = ldl_le_phys(&s->dma_as, value + 12);
newpixo = &pixo;
resplen = 4;
break;
case 0x00040007: /* Get alpha */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->alpha);
resplen = 4;
break;
case 0x00044007: /* Test pixel alpha */
resplen = 4;
break;
case 0x00048007: /* Set alpha */
alpha = ldl_le_phys(&s->dma_as, value + 12);
newalpha = &alpha;
resplen = 4;
break;
case 0x00040008: /* Get pitch */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->pitch);
resplen = 4;
break;
case 0x00040009: /* Get virtual offset */
stl_le_phys(&s->dma_as, value + 12, s->fbdev->xoffset);
stl_le_phys(&s->dma_as, value + 16, s->fbdev->yoffset);
resplen = 8;
break;
case 0x00044009: /* Test virtual offset */
resplen = 8;
break;
case 0x00048009: /* Set virtual offset */
xoffset = ldl_le_phys(&s->dma_as, value + 12);
newxoffset = &xoffset;
yoffset = ldl_le_phys(&s->dma_as, value + 16);
newyoffset = &yoffset;
resplen = 8;
break;
case 0x0004000a: /* Get/Test/Set overscan */
case 0x0004400a:
case 0x0004800a:
stl_le_phys(&s->dma_as, value + 12, 0);
stl_le_phys(&s->dma_as, value + 16, 0);
stl_le_phys(&s->dma_as, value + 20, 0);
stl_le_phys(&s->dma_as, value + 24, 0);
resplen = 16;
break;
case 0x0004800b: /* Set palette */
offset = ldl_le_phys(&s->dma_as, value + 12);
length = ldl_le_phys(&s->dma_as, value + 16);
n = 0;
while (n < length - offset) {
color = ldl_le_phys(&s->dma_as, value + 20 + (n << 2));
stl_le_phys(&s->dma_as,
s->fbdev->vcram_base + ((offset + n) << 2), color);
n++;
}
stl_le_phys(&s->dma_as, value + 12, 0);
resplen = 4;
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;
}
/* Reconfigure framebuffer if required */
if (newxres || newyres || newxoffset || newyoffset || newbpp || newpixo
|| newalpha) {
bcm2835_fb_reconfigure(s->fbdev, newxres, newyres, newxoffset,
newyoffset, newbpp, newpixo, newalpha);
}
/* 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), "fb", &err);
if (obj == NULL) {
error_setg(errp, "%s: required fb link not found: %s",
__func__, error_get_pretty(err));
return;
}
s->fbdev = BCM2835_FB(obj);
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_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)
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