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>

hw/arm/bcm2835_peripherals.c

@@ -79,6 +79,8 @@ static void bcm2835_peripherals_init(Object *obj)
                               "board-rev", &error_abort);
     qdev_set_parent_bus(DEVICE(&s->property), sysbus_get_default());
 
+    object_property_add_const_link(OBJECT(&s->property), "fb",
+                                   OBJECT(&s->fb), &error_abort);
     object_property_add_const_link(OBJECT(&s->property), "dma-mr",
                                    OBJECT(&s->gpu_bus_mr), &error_abort);
 
@@ -211,12 +213,6 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
                        qdev_get_gpio_in(DEVICE(&s->mboxes), MBOX_CHAN_FB));
 
     /* Property channel */
-    object_property_set_int(OBJECT(&s->property), ram_size, "ram-size", &err);
-    if (err) {
-        error_propagate(errp, err);
-        return;
-    }
-
     object_property_set_bool(OBJECT(&s->property), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);

hw/arm/raspi.c

@@ -164,11 +164,6 @@ static void raspi2_machine_init(MachineClass *mc)
     mc->no_floppy = 1;
     mc->no_cdrom = 1;
     mc->max_cpus = BCM2836_NCPUS;
-
+    mc->default_ram_size = 1024 * 1024 * 1024;
-    /* XXX: Temporary restriction in RAM size from the full 1GB. Since
-     * we do not yet support the framebuffer / GPU, we need to limit
-     * RAM usable by the OS to sit below the peripherals.
-     */
-    mc->default_ram_size = 0x3F000000; /* BCM2836_PERI_BASE */
 };
 DEFINE_MACHINE("raspi2", raspi2_machine_init)

hw/misc/bcm2835_property.c

@@ -17,6 +17,11 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
     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;
 
@@ -60,7 +65,14 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
             /* base */
             stl_le_phys(&s->dma_as, value + 12, 0);
             /* size */
-            stl_le_phys(&s->dma_as, value + 16, s->ram_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 */
@@ -122,6 +134,114 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
             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 = α
+            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 */
@@ -147,6 +267,13 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
         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));
 }
@@ -241,6 +368,15 @@ static void bcm2835_property_realize(DeviceState *dev, Error **errp)
     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",
@@ -259,7 +395,6 @@ static void bcm2835_property_realize(DeviceState *dev, Error **errp)
 
 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()
 };
 

include/hw/misc/bcm2835_property.h

@@ -9,6 +9,7 @@
 #include "hw/sysbus.h"
 #include "exec/address-spaces.h"
 #include "net/net.h"
+#include "hw/display/bcm2835_fb.h"
 
 #define TYPE_BCM2835_PROPERTY "bcm2835-property"
 #define BCM2835_PROPERTY(obj) \
@@ -18,13 +19,15 @@ typedef struct {
     /*< private >*/
     SysBusDevice busdev;
     /*< public >*/
+
     MemoryRegion *dma_mr;
     AddressSpace dma_as;
     MemoryRegion iomem;
     qemu_irq mbox_irq;
+    BCM2835FBState *fbdev;
+
     MACAddr macaddr;
     uint32_t board_rev;
-    uint32_t ram_size;
     uint32_t addr;
     bool pending;
 } BCM2835PropertyState;