[Qemu-arm] [PATCH 2/8] bcm2835_property: add bcm2835 property channel

[Andrew Baumann]

This sits behind the mailbox interface, and implements
request/response queries for system properties. The
framebuffer-related properties will be added in a later patch.

Signed-off-by: Andrew Baumann <address@hidden>
---
 hw/misc/Makefile.objs              |   1 +
 hw/misc/bcm2835_property.c         | 262 +++++++++++++++++++++++++++++++++++++
 include/hw/misc/bcm2835_property.h |  27 ++++
 3 files changed, 290 insertions(+)
 create mode 100644 hw/misc/bcm2835_property.c
 create mode 100644 include/hw/misc/bcm2835_property.h

diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index b9379f2..f4286f2 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -34,6 +34,7 @@ obj-$(CONFIG_OMAP) += omap_gpmc.o
 obj-$(CONFIG_OMAP) += omap_l4.o
 obj-$(CONFIG_OMAP) += omap_sdrc.o
 obj-$(CONFIG_OMAP) += omap_tap.o
+obj-$(CONFIG_RASPI) += bcm2835_property.o
 obj-$(CONFIG_RASPI) += bcm2835_sbm.o
 obj-$(CONFIG_SLAVIO) += slavio_misc.o
 obj-$(CONFIG_ZYNQ) += zynq_slcr.o
diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c
new file mode 100644
index 0000000..d25c056
--- /dev/null
+++ b/hw/misc/bcm2835_property.c
@@ -0,0 +1,262 @@
+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * This code is licensed under the GNU GPLv2 and later.
+ */
+
+#include "hw/misc/bcm2835_property.h"
+#include "hw/arm/bcm2835_mbox.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_phys(&s->dma_as, value);
+
+    /* @(addr + 4) : Buffer response code */
+    value = s->addr + 8;
+    while (value + 8 <= s->addr + tot_len) {
+        tag = ldl_phys(&s->dma_as, value);
+        bufsize = ldl_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_phys(&s->dma_as, value + 12, 346337);
+            resplen = 4;
+            break;
+
+        case 0x00010001: /* Get board model */
+            resplen = 4;
+            break;
+        case 0x00010002: /* Get board revision */
+            resplen = 4;
+            break;
+        case 0x00010003: /* Get board MAC address */
+            /* write the first four bytes of the 6-byte MAC */
+            stl_phys(&s->dma_as, value + 12, 0xB827EBD0);
+            /* write the last two bytes, avoid any write past the buffer end */
+            stb_phys(&s->dma_as, value + 16, 0xEE);
+            stb_phys(&s->dma_as, value + 17, 0xDF);
+            resplen = 6;
+            break;
+        case 0x00010004: /* Get board serial */
+            resplen = 8;
+            break;
+        case 0x00010005: /* Get ARM memory */
+            /* base */
+            stl_phys(&s->dma_as, value + 12, 0);
+            /* size */
+            stl_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_phys(&s->dma_as, value + 16);
+            stl_phys(&s->dma_as, value + 16, (tmp & 1));
+            resplen = 8;
+            break;
+
+        /* Clocks */
+
+        case 0x00030001: /* Get clock state */
+            stl_phys(&s->dma_as, value + 16, 0x1);
+            resplen = 8;
+            break;
+
+        case 0x00038001: /* Set clock state */
+            resplen = 8;
+            break;
+
+        case 0x00030002: /* Get clock rate */
+        case 0x00030004: /* Get max clock rate */
+        case 0x00030007: /* Get min clock rate */
+            switch (ldl_phys(&s->dma_as, value + 12)) {
+            case 1: /* EMMC */
+                stl_phys(&s->dma_as, value + 16, 50000000);
+                break;
+            case 2: /* UART */
+                stl_phys(&s->dma_as, value + 16, 3000000);
+                break;
+            default:
+                stl_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 */
+            resplen = 8;
+            break;
+
+        /* Temperature */
+
+        case 0x00030006: /* Get temperature */
+            stl_phys(&s->dma_as, value + 16, 25000);
+            resplen = 8;
+            break;
+
+        case 0x0003000A: /* Get max temperature */
+            stl_phys(&s->dma_as, value + 16, 99000);
+            resplen = 8;
+            break;
+
+
+        case 0x00060001: /* Get DMA channels */
+            /* channels 2-5 */
+            stl_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_phys(&s->dma_as, value + 8, (1 << 31) | resplen);
+        value += bufsize + 12;
+    }
+
+    /* Buffer response code */
+    stl_phys(&s->dma_as, s->addr + 4, (1 << 31));
+}
+
+static uint64_t bcm2835_property_read(void *opaque, hwaddr offset,
+    unsigned size)
+{
+    BCM2835PropertyState *s = (BCM2835PropertyState *)opaque;
+    uint32_t res = 0;
+
+    switch (offset) {
+    case 0:
+        res = MBOX_CHAN_PROPERTY | s->addr;
+        s->pending = 0;
+        qemu_set_irq(s->mbox_irq, 0);
+        break;
+    case 4:
+        res = s->pending;
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+            "bcm2835_property_read: Bad offset %x\n", (int)offset);
+        return 0;
+    }
+    return res;
+}
+
+static void bcm2835_property_write(void *opaque, hwaddr offset,
+    uint64_t value, unsigned size)
+{
+    BCM2835PropertyState *s = (BCM2835PropertyState *)opaque;
+    switch (offset) {
+    case 0:
+        if (!s->pending) {
+            s->pending = 1;
+            bcm2835_property_mbox_push(s, value);
+            qemu_set_irq(s->mbox_irq, 1);
+        }
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+            "bcm2835_property_write: Bad offset %x\n", (int)offset);
+        return;
+    }
+
+}
+
+
+static const MemoryRegionOps bcm2835_property_ops = {
+    .read = bcm2835_property_read,
+    .write = bcm2835_property_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+
+static const VMStateDescription vmstate_bcm2835_property = {
+    .name = TYPE_BCM2835_PROPERTY,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        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_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 (err || obj == NULL) {
+        error_setg(errp, "bcm2835_property: required dma_mr link not found");
+        return;
+    }
+
+    s->dma_mr = MEMORY_REGION(obj);
+    address_space_init(&s->dma_as, s->dma_mr, NULL);
+
+    s->pending = 0;
+}
+
+static Property bcm2835_property_props[] = {
+    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)
diff --git a/include/hw/misc/bcm2835_property.h 
b/include/hw/misc/bcm2835_property.h
new file mode 100644
index 0000000..c952165
--- /dev/null
+++ b/include/hw/misc/bcm2835_property.h
@@ -0,0 +1,27 @@
+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * This code is licensed under the GNU GPLv2 and later.
+ */
+
+#ifndef BCM2835_PROPERTY_H
+#define BCM2835_PROPERTY_H
+
+#include "hw/sysbus.h"
+#include "exec/address-spaces.h"
+
+#define TYPE_BCM2835_PROPERTY "bcm2835_property"
+#define BCM2835_PROPERTY(obj) \
+        OBJECT_CHECK(BCM2835PropertyState, (obj), TYPE_BCM2835_PROPERTY)
+
+typedef struct {
+    SysBusDevice busdev;
+    MemoryRegion *dma_mr;
+    AddressSpace dma_as;
+    MemoryRegion iomem;
+    uint32_t addr;
+    int pending;
+    qemu_irq mbox_irq;
+    uint32_t ram_size;
+} BCM2835PropertyState;
+
+#endif
-- 
2.5.3