diff options
author | Chris Wulff <crwulff@gmail.com> | 2017-01-18 23:01:43 +0100 |
---|---|---|
committer | Richard Henderson <rth@twiddle.net> | 2017-01-24 13:10:35 -0800 |
commit | d2fe4ec19dd3060b12a04370300e49e4b6e519b5 (patch) | |
tree | 975b589b344a189428de82430f59faa19e4f9389 | |
parent | a0a839b65b61a51934b9c2c197fa058c319cc94a (diff) |
nios2: Add IIC interrupt controller emulation
Add the Altera Nios2 internal interrupt controller model.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chris Wulff <crwulff@gmail.com>
Cc: Jeff Da Silva <jdasilva@altera.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Sandra Loosemore <sandra@codesourcery.com>
Cc: Yves Vandervennet <yvanderv@altera.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Message-Id: <20170118220146.489-5-marex@denx.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
-rw-r--r-- | hw/intc/Makefile.objs | 1 | ||||
-rw-r--r-- | hw/intc/nios2_iic.c | 103 |
2 files changed, 104 insertions, 0 deletions
diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs index 2f44a2da26..8948106ac4 100644 --- a/hw/intc/Makefile.objs +++ b/hw/intc/Makefile.objs @@ -41,3 +41,4 @@ obj-$(CONFIG_S390_FLIC_KVM) += s390_flic_kvm.o obj-$(CONFIG_ASPEED_SOC) += aspeed_vic.o obj-$(CONFIG_ARM_GIC) += arm_gicv3_cpuif.o obj-$(CONFIG_MIPS_CPS) += mips_gic.o +obj-$(CONFIG_NIOS2) += nios2_iic.o diff --git a/hw/intc/nios2_iic.c b/hw/intc/nios2_iic.c new file mode 100644 index 0000000000..818ab1b315 --- /dev/null +++ b/hw/intc/nios2_iic.c @@ -0,0 +1,103 @@ +/* + * QEMU Altera Internal Interrupt Controller. + * + * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * <http://www.gnu.org/licenses/lgpl-2.1.html> + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qapi/error.h" + +#include "hw/sysbus.h" +#include "cpu.h" + +#define TYPE_ALTERA_IIC "altera,iic" +#define ALTERA_IIC(obj) \ + OBJECT_CHECK(AlteraIIC, (obj), TYPE_ALTERA_IIC) + +typedef struct AlteraIIC { + SysBusDevice parent_obj; + void *cpu; + qemu_irq parent_irq; +} AlteraIIC; + +static void update_irq(AlteraIIC *pv) +{ + CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env; + + qemu_set_irq(pv->parent_irq, + env->regs[CR_IPENDING] & env->regs[CR_IENABLE]); +} + +static void irq_handler(void *opaque, int irq, int level) +{ + AlteraIIC *pv = opaque; + CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env; + + env->regs[CR_IPENDING] &= ~(1 << irq); + env->regs[CR_IPENDING] |= !!level << irq; + + update_irq(pv); +} + +static void altera_iic_init(Object *obj) +{ + AlteraIIC *pv = ALTERA_IIC(obj); + + qdev_init_gpio_in(DEVICE(pv), irq_handler, 32); + sysbus_init_irq(SYS_BUS_DEVICE(obj), &pv->parent_irq); +} + +static Property altera_iic_properties[] = { + DEFINE_PROP_PTR("cpu", AlteraIIC, cpu), + DEFINE_PROP_END_OF_LIST(), +}; + +static void altera_iic_realize(DeviceState *dev, Error **errp) +{ + struct AlteraIIC *pv = ALTERA_IIC(dev); + + if (!pv->cpu) { + error_setg(errp, "altera,iic: CPU not connected"); + return; + } +} + +static void altera_iic_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->props = altera_iic_properties; + /* Reason: pointer property "cpu" */ + dc->cannot_instantiate_with_device_add_yet = true; + dc->realize = altera_iic_realize; +} + +static TypeInfo altera_iic_info = { + .name = "altera,iic", + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(AlteraIIC), + .instance_init = altera_iic_init, + .class_init = altera_iic_class_init, +}; + +static void altera_iic_register(void) +{ + type_register_static(&altera_iic_info); +} + +type_init(altera_iic_register) |