Reviewed-by: Peter Crosthwaite <crosthwaite.pe...@gmail.com>
Signed-off-by: Andrew Baumann <andrew.baum...@microsoft.com>
---
Notes:
v3:
* minor style tweaks
* use extract32 in place of manual shift/masking
v2:
* split inputs to named gpu_irq and arm_irq gpio inputs
* use 64-bit gpu_irq and 8-bit arm_irq status rather than 3*32-bit
bitfields
* added defined names for register offsets
* deleted nop realize method
* other misc cleanup suggested in review
hw/intc/Makefile.objs | 1 +
hw/intc/bcm2835_ic.c | 236 +++++++++++++++++++++++++++++++++++++++++++
include/hw/intc/bcm2835_ic.h | 33 ++++++
3 files changed, 270 insertions(+)
create mode 100644 hw/intc/bcm2835_ic.c
create mode 100644 include/hw/intc/bcm2835_ic.h
diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
index 004b0c2..2ad1204 100644
--- a/hw/intc/Makefile.objs
+++ b/hw/intc/Makefile.objs
@@ -24,6 +24,7 @@ obj-$(CONFIG_GRLIB) += grlib_irqmp.o
obj-$(CONFIG_IOAPIC) += ioapic.o
obj-$(CONFIG_OMAP) += omap_intc.o
obj-$(CONFIG_OPENPIC_KVM) += openpic_kvm.o
+obj-$(CONFIG_RASPI) += bcm2835_ic.o
obj-$(CONFIG_SH4) += sh_intc.o
obj-$(CONFIG_XICS) += xics.o
obj-$(CONFIG_XICS_KVM) += xics_kvm.o
diff --git a/hw/intc/bcm2835_ic.c b/hw/intc/bcm2835_ic.c
new file mode 100644
index 0000000..005a72b
--- /dev/null
+++ b/hw/intc/bcm2835_ic.c
@@ -0,0 +1,236 @@
+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew
Baumann.
+ * This code is licensed under the GNU GPLv2 and later.
+ * Heavily based on pl190.c, copyright terms below:
+ *
+ * Arm PrimeCell PL190 Vector Interrupt Controller
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the GPL.
+ */
+
+#include "hw/intc/bcm2835_ic.h"
+
+#define GPU_IRQS 64
+#define ARM_IRQS 8
+
+#define IRQ_PENDING_BASIC 0x00 /* IRQ basic pending */
+#define IRQ_PENDING_1 0x04 /* IRQ pending 1 */
+#define IRQ_PENDING_2 0x08 /* IRQ pending 2 */
+#define FIQ_CONTROL 0x0C /* FIQ register */
+#define IRQ_ENABLE_1 0x10 /* Interrupt enable register 1 */
+#define IRQ_ENABLE_2 0x14 /* Interrupt enable register 2 */
+#define IRQ_ENABLE_BASIC 0x18 /* Base interrupt enable register */
+#define IRQ_DISABLE_1 0x1C /* Interrupt disable register 1 */
+#define IRQ_DISABLE_2 0x20 /* Interrupt disable register 2 */
+#define IRQ_DISABLE_BASIC 0x24 /* Base interrupt disable register */
+
+/* Update interrupts. */
+static void bcm2835_ic_update(BCM2835ICState *s)
+{
+ bool set = false;
+
+ if (s->fiq_enable) {
+ if (s->fiq_select >= GPU_IRQS) {
+ /* ARM IRQ */
+ set = extract32(s->arm_irq_level, s->fiq_select - GPU_IRQS, 1);
+ } else {
+ set = extract64(s->gpu_irq_level, s->fiq_select, 1);
+ }
+ }
+ qemu_set_irq(s->fiq, set);
+
+ set = (s->gpu_irq_level & s->gpu_irq_enable)
+ || (s->arm_irq_level & s->arm_irq_enable);
+ qemu_set_irq(s->irq, set);
+
+}
+
+static void bcm2835_ic_set_gpu_irq(void *opaque, int irq, int level)
+{
+ BCM2835ICState *s = opaque;
+
+ assert(irq >= 0 && irq < 64);
+ s->gpu_irq_level = deposit64(s->gpu_irq_level, irq, 1, level != 0);
+ bcm2835_ic_update(s);
+}
+
+static void bcm2835_ic_set_arm_irq(void *opaque, int irq, int level)
+{
+ BCM2835ICState *s = opaque;
+
+ assert(irq >= 0 && irq < 8);
+ s->arm_irq_level = deposit32(s->arm_irq_level, irq, 1, level != 0);
+ bcm2835_ic_update(s);
+}
+
+static const int irq_dups[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 };
+
+static uint64_t bcm2835_ic_read(void *opaque, hwaddr offset, unsigned size)
+{
+ BCM2835ICState *s = opaque;
+ uint32_t res = 0;
+ uint64_t gpu_pending = s->gpu_irq_level & s->gpu_irq_enable;
+ int i;
+
+ switch (offset) {
+ case IRQ_PENDING_BASIC:
+ /* bits 0-7: ARM irqs */
+ res = s->arm_irq_level & s->arm_irq_enable;
+
+ /* bits 8 & 9: pending registers 1 & 2 */
+ res |= (((uint32_t)gpu_pending) != 0) << 8;
+ res |= ((gpu_pending >> 32) != 0) << 9;
+
+ /* bits 10-20: selected GPU IRQs */
+ for (i = 0; i < ARRAY_SIZE(irq_dups); i++) {
+ res |= extract64(gpu_pending, irq_dups[i], 1) << (i + 10);
+ }
+ break;
+ case IRQ_PENDING_1:
+ res = gpu_pending;
+ break;
+ case IRQ_PENDING_2:
+ res = gpu_pending >> 32;
+ break;
+ case FIQ_CONTROL:
+ res = (s->fiq_enable << 7) | s->fiq_select;
+ break;
+ case IRQ_ENABLE_1:
+ res = s->gpu_irq_enable;
+ break;
+ case IRQ_ENABLE_2:
+ res = s->gpu_irq_enable >> 32;
+ break;
+ case IRQ_ENABLE_BASIC:
+ res = s->arm_irq_enable;
+ break;
+ case IRQ_DISABLE_1:
+ res = ~s->gpu_irq_enable;
+ break;
+ case IRQ_DISABLE_2:
+ res = ~s->gpu_irq_enable >> 32;
+ break;
+ case IRQ_DISABLE_BASIC:
+ res = ~s->arm_irq_enable;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
+ __func__, offset);
+ return 0;
+ }
+
+ return res;
+}
+
+static void bcm2835_ic_write(void *opaque, hwaddr offset, uint64_t val,
+ unsigned size)
+{
+ BCM2835ICState *s = opaque;
+
+ switch (offset) {
+ case FIQ_CONTROL:
+ s->fiq_select = extract32(val, 0, 7);
+ s->fiq_enable = extract32(val, 7, 1);
+ break;
+ case IRQ_ENABLE_1:
+ s->gpu_irq_enable |= val;
+ break;
+ case IRQ_ENABLE_2:
+ s->gpu_irq_enable |= val << 32;
+ break;
+ case IRQ_ENABLE_BASIC:
+ s->arm_irq_enable |= val & 0xff;
+ break;
+ case IRQ_DISABLE_1:
+ s->gpu_irq_enable &= ~val;
+ break;
+ case IRQ_DISABLE_2:
+ s->gpu_irq_enable &= ~(val << 32);
+ break;
+ case IRQ_DISABLE_BASIC:
+ s->arm_irq_enable &= ~val & 0xff;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
+ __func__, offset);
+ return;
+ }
+ bcm2835_ic_update(s);
+}
+
+static const MemoryRegionOps bcm2835_ic_ops = {
+ .read = bcm2835_ic_read,
+ .write = bcm2835_ic_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid.min_access_size = 4,
+ .valid.max_access_size = 4,
+};
+
+static void bcm2835_ic_reset(DeviceState *d)
+{
+ BCM2835ICState *s = BCM2835_IC(d);
+
+ s->gpu_irq_enable = 0;
+ s->arm_irq_enable = 0;
+ s->fiq_enable = false;
+ s->fiq_select = 0;
+}
+
+static void bcm2835_ic_init(Object *obj)
+{
+ BCM2835ICState *s = BCM2835_IC(obj);
+
+ memory_region_init_io(&s->iomem, obj, &bcm2835_ic_ops, s, TYPE_BCM2835_IC,
+ 0x200);
+ sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
+
+ qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_gpu_irq,
+ BCM2835_IC_GPU_IRQ, GPU_IRQS);
+ qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_arm_irq,
+ BCM2835_IC_ARM_IRQ, ARM_IRQS);
+
+ sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
+ sysbus_init_irq(SYS_BUS_DEVICE(s), &s->fiq);
+}
+
+static const VMStateDescription vmstate_bcm2835_ic = {
+ .name = TYPE_BCM2835_IC,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64(gpu_irq_level, BCM2835ICState),
+ VMSTATE_UINT64(gpu_irq_enable, BCM2835ICState),
+ VMSTATE_UINT8(arm_irq_level, BCM2835ICState),
+ VMSTATE_UINT8(arm_irq_enable, BCM2835ICState),
+ VMSTATE_BOOL(fiq_enable, BCM2835ICState),
+ VMSTATE_UINT8(fiq_select, BCM2835ICState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void bcm2835_ic_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->reset = bcm2835_ic_reset;
+ dc->vmsd = &vmstate_bcm2835_ic;
+}
+
+static TypeInfo bcm2835_ic_info = {
+ .name = TYPE_BCM2835_IC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(BCM2835ICState),
+ .class_init = bcm2835_ic_class_init,
+ .instance_init = bcm2835_ic_init,
+};
+
+static void bcm2835_ic_register_types(void)
+{
+ type_register_static(&bcm2835_ic_info);
+}
+
+type_init(bcm2835_ic_register_types)
diff --git a/include/hw/intc/bcm2835_ic.h b/include/hw/intc/bcm2835_ic.h
new file mode 100644
index 0000000..fb75fa0
--- /dev/null
+++ b/include/hw/intc/bcm2835_ic.h
@@ -0,0 +1,33 @@
+/*
+ * Raspberry Pi emulation (c) 2012 Gregory Estrade
+ * This code is licensed under the GNU GPLv2 and later.
+ */
+
+#ifndef BCM2835_IC_H
+#define BCM2835_IC_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_BCM2835_IC "bcm2835-ic"
+#define BCM2835_IC(obj) OBJECT_CHECK(BCM2835ICState, (obj), TYPE_BCM2835_IC)
+
+#define BCM2835_IC_GPU_IRQ "gpu-irq"
+#define BCM2835_IC_ARM_IRQ "arm-irq"
+
+typedef struct BCM2835ICState {
+ /*< private >*/
+ SysBusDevice busdev;
+ /*< public >*/
+
+ MemoryRegion iomem;
+ qemu_irq irq;
+ qemu_irq fiq;
+
+ /* 64 GPU IRQs + 8 ARM IRQs = 72 total (GPU first) */
+ uint64_t gpu_irq_level, gpu_irq_enable;
+ uint8_t arm_irq_level, arm_irq_enable;
+ bool fiq_enable;
+ uint8_t fiq_select;
+} BCM2835ICState;
+
+#endif
--
2.5.3
