bcm2835_peripherals: add rollup device for bcm2835 peripherals

This device maintains all the non-CPU peripherals on bcm2835 (Pi1)
which are also present on bcm2836 (Pi2). It also implements the
private address spaces used for DMA and mailboxes.

Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 205 insertions, 0 deletions

diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 2195b60fac..82cc1424ac 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -11,6 +11,7 @@ obj-y += armv7m.o exynos4210.o pxa2xx.o pxa2xx_gpio.o pxa2xx_pic.o
 obj-$(CONFIG_DIGIC) += digic.o
 obj-y += omap1.o omap2.o strongarm.o
 obj-$(CONFIG_ALLWINNER_A10) += allwinner-a10.o cubieboard.o
+obj-$(CONFIG_RASPI) += bcm2835_peripherals.o
 obj-$(CONFIG_STM32F205_SOC) += stm32f205_soc.o
 obj-$(CONFIG_XLNX_ZYNQMP) += xlnx-zynqmp.o xlnx-ep108.o
 obj-$(CONFIG_FSL_IMX25) += fsl-imx25.o imx25_pdk.o
diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
new file mode 100644
index 0000000000..18b72ecb69
--- /dev/null
+++ b/hw/arm/bcm2835_peripherals.c
@@ -0,0 +1,204 @@
+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous
+ *
+ * Rasperry Pi 2 emulation and refactoring Copyright (c) 2015, Microsoft
+ * Written by Andrew Baumann
+ *
+ * This code is licensed under the GNU GPLv2 and later.
+ */
+
+#include "hw/arm/bcm2835_peripherals.h"
+#include "hw/misc/bcm2835_mbox_defs.h"
+#include "hw/arm/raspi_platform.h"
+
+/* Peripheral base address on the VC (GPU) system bus */
+#define BCM2835_VC_PERI_BASE 0x7e000000
+
+/* Capabilities for SD controller: no DMA, high-speed, default clocks etc. */
+#define BCM2835_SDHC_CAPAREG 0x52034b4
+
+static void bcm2835_peripherals_init(Object *obj)
+{
+    BCM2835PeripheralState *s = BCM2835_PERIPHERALS(obj);
+
+    /* Memory region for peripheral devices, which we export to our parent */
+    memory_region_init(&s->peri_mr, obj,"bcm2835-peripherals", 0x1000000);
+    object_property_add_child(obj, "peripheral-io", OBJECT(&s->peri_mr), NULL);
+    sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->peri_mr);
+
+    /* Internal memory region for peripheral bus addresses (not exported) */
+    memory_region_init(&s->gpu_bus_mr, obj, "bcm2835-gpu", (uint64_t)1 << 32);
+    object_property_add_child(obj, "gpu-bus", OBJECT(&s->gpu_bus_mr), NULL);
+
+    /* Internal memory region for request/response communication with
+     * mailbox-addressable peripherals (not exported)
+     */
+    memory_region_init(&s->mbox_mr, obj, "bcm2835-mbox",
+                       MBOX_CHAN_COUNT << MBOX_AS_CHAN_SHIFT);
+
+    /* Interrupt Controller */
+    object_initialize(&s->ic, sizeof(s->ic), TYPE_BCM2835_IC);
+    object_property_add_child(obj, "ic", OBJECT(&s->ic), NULL);
+    qdev_set_parent_bus(DEVICE(&s->ic), sysbus_get_default());
+
+    /* UART0 */
+    s->uart0 = SYS_BUS_DEVICE(object_new("pl011"));
+    object_property_add_child(obj, "uart0", OBJECT(s->uart0), NULL);
+    qdev_set_parent_bus(DEVICE(s->uart0), sysbus_get_default());
+
+    /* Mailboxes */
+    object_initialize(&s->mboxes, sizeof(s->mboxes), TYPE_BCM2835_MBOX);
+    object_property_add_child(obj, "mbox", OBJECT(&s->mboxes), NULL);
+    qdev_set_parent_bus(DEVICE(&s->mboxes), sysbus_get_default());
+
+    object_property_add_const_link(OBJECT(&s->mboxes), "mbox-mr",
+                                   OBJECT(&s->mbox_mr), &error_abort);
+
+    /* Property channel */
+    object_initialize(&s->property, sizeof(s->property), TYPE_BCM2835_PROPERTY);
+    object_property_add_child(obj, "property", OBJECT(&s->property), NULL);
+    qdev_set_parent_bus(DEVICE(&s->property), sysbus_get_default());
+
+    object_property_add_const_link(OBJECT(&s->property), "dma-mr",
+                                   OBJECT(&s->gpu_bus_mr), &error_abort);
+
+    /* Extended Mass Media Controller */
+    object_initialize(&s->sdhci, sizeof(s->sdhci), TYPE_SYSBUS_SDHCI);
+    object_property_add_child(obj, "sdhci", OBJECT(&s->sdhci), NULL);
+    qdev_set_parent_bus(DEVICE(&s->sdhci), sysbus_get_default());
+}
+
+static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
+{
+    BCM2835PeripheralState *s = BCM2835_PERIPHERALS(dev);
+    Object *obj;
+    MemoryRegion *ram;
+    Error *err = NULL;
+    uint32_t ram_size;
+    int n;
+
+    obj = object_property_get_link(OBJECT(dev), "ram", &err);
+    if (obj == NULL) {
+        error_setg(errp, "%s: required ram link not found: %s",
+                   __func__, error_get_pretty(err));
+        return;
+    }
+
+    ram = MEMORY_REGION(obj);
+    ram_size = memory_region_size(ram);
+
+    /* Map peripherals and RAM into the GPU address space. */
+    memory_region_init_alias(&s->peri_mr_alias, OBJECT(s),
+                             "bcm2835-peripherals", &s->peri_mr, 0,
+                             memory_region_size(&s->peri_mr));
+
+    memory_region_add_subregion_overlap(&s->gpu_bus_mr, BCM2835_VC_PERI_BASE,
+                                        &s->peri_mr_alias, 1);
+
+    /* RAM is aliased four times (different cache configurations) on the GPU */
+    for (n = 0; n < 4; n++) {
+        memory_region_init_alias(&s->ram_alias[n], OBJECT(s),
+                                 "bcm2835-gpu-ram-alias[*]", ram, 0, ram_size);
+        memory_region_add_subregion_overlap(&s->gpu_bus_mr, (hwaddr)n << 30,
+                                            &s->ram_alias[n], 0);
+    }
+
+    /* Interrupt Controller */
+    object_property_set_bool(OBJECT(&s->ic), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, ARMCTRL_IC_OFFSET,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->ic), 0));
+    sysbus_pass_irq(SYS_BUS_DEVICE(s), SYS_BUS_DEVICE(&s->ic));
+
+    /* UART0 */
+    object_property_set_bool(OBJECT(s->uart0), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, UART0_OFFSET,
+                                sysbus_mmio_get_region(s->uart0, 0));
+    sysbus_connect_irq(s->uart0, 0,
+        qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_GPU_IRQ,
+                               INTERRUPT_UART));
+
+    /* Mailboxes */
+    object_property_set_bool(OBJECT(&s->mboxes), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, ARMCTRL_0_SBM_OFFSET,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->mboxes), 0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->mboxes), 0,
+        qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_ARM_IRQ,
+                               INTERRUPT_ARM_MAILBOX));
+
+    /* 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);
+        return;
+    }
+
+    memory_region_add_subregion(&s->mbox_mr,
+                MBOX_CHAN_PROPERTY << MBOX_AS_CHAN_SHIFT,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->property), 0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->property), 0,
+                      qdev_get_gpio_in(DEVICE(&s->mboxes), MBOX_CHAN_PROPERTY));
+
+    /* Extended Mass Media Controller */
+    object_property_set_int(OBJECT(&s->sdhci), BCM2835_SDHC_CAPAREG, "capareg",
+                            &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    object_property_set_bool(OBJECT(&s->sdhci), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, EMMC_OFFSET,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->sdhci), 0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->sdhci), 0,
+        qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_GPU_IRQ,
+                               INTERRUPT_ARASANSDIO));
+}
+
+static void bcm2835_peripherals_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = bcm2835_peripherals_realize;
+}
+
+static const TypeInfo bcm2835_peripherals_type_info = {
+    .name = TYPE_BCM2835_PERIPHERALS,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(BCM2835PeripheralState),
+    .instance_init = bcm2835_peripherals_init,
+    .class_init = bcm2835_peripherals_class_init,
+};
+
+static void bcm2835_peripherals_register_types(void)
+{
+    type_register_static(&bcm2835_peripherals_type_info);
+}
+
+type_init(bcm2835_peripherals_register_types)