diff options
Diffstat (limited to 'qemu/hw/intc/aspeed_vic.c')
| -rw-r--r-- | qemu/hw/intc/aspeed_vic.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/qemu/hw/intc/aspeed_vic.c b/qemu/hw/intc/aspeed_vic.c new file mode 100644 index 000000000..19a0ff748 --- /dev/null +++ b/qemu/hw/intc/aspeed_vic.c @@ -0,0 +1,339 @@ +/* + * ASPEED Interrupt Controller (New) + * + * Andrew Jeffery <andrew@aj.id.au> + * + * Copyright 2015, 2016 IBM Corp. + * + * This code is licensed under the GPL version 2 or later. See + * the COPYING file in the top-level directory. + */ + +/* The hardware exposes two register sets, a legacy set and a 'new' set. The + * model implements the 'new' register set, and logs warnings on accesses to + * the legacy IO space. + * + * The hardware uses 32bit registers to manage 51 IRQs, with low and high + * registers for each conceptual register. The device model's implementation + * uses 64bit data types to store both low and high register values (in the one + * member), but must cope with access offset values in multiples of 4 passed to + * the callbacks. As such the read() and write() implementations process the + * provided offset to understand whether the access is requesting the lower or + * upper 32 bits of the 64bit member. + * + * Additionally, the "Interrupt Enable", "Edge Status" and "Software Interrupt" + * fields have separate "enable"/"status" and "clear" registers, where set bits + * are written to one or the other to change state (avoiding a + * read-modify-write sequence). + */ + +#include "qemu/osdep.h" +#include <inttypes.h> +#include "hw/intc/aspeed_vic.h" +#include "qemu/bitops.h" +#include "trace.h" + +#define AVIC_NEW_BASE_OFFSET 0x80 + +#define AVIC_L_MASK 0xFFFFFFFFU +#define AVIC_H_MASK 0x0007FFFFU +#define AVIC_EVENT_W_MASK (0x78000ULL << 32) + +static void aspeed_vic_update(AspeedVICState *s) +{ + uint64_t new = (s->raw & s->enable); + uint64_t flags; + + flags = new & s->select; + trace_aspeed_vic_update_fiq(!!flags); + qemu_set_irq(s->fiq, !!flags); + + flags = new & ~s->select; + trace_aspeed_vic_update_irq(!!flags); + qemu_set_irq(s->irq, !!flags); +} + +static void aspeed_vic_set_irq(void *opaque, int irq, int level) +{ + uint64_t irq_mask; + bool raise; + AspeedVICState *s = (AspeedVICState *)opaque; + + if (irq > ASPEED_VIC_NR_IRQS) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid interrupt number: %d\n", + __func__, irq); + return; + } + + trace_aspeed_vic_set_irq(irq, level); + + irq_mask = BIT(irq); + if (s->sense & irq_mask) { + /* level-triggered */ + if (s->event & irq_mask) { + /* high-sensitive */ + raise = level; + } else { + /* low-sensitive */ + raise = !level; + } + s->raw = deposit64(s->raw, irq, 1, raise); + } else { + uint64_t old_level = s->level & irq_mask; + + /* edge-triggered */ + if (s->dual_edge & irq_mask) { + raise = (!!old_level) != (!!level); + } else { + if (s->event & irq_mask) { + /* rising-sensitive */ + raise = !old_level && level; + } else { + /* falling-sensitive */ + raise = old_level && !level; + } + } + if (raise) { + s->raw = deposit64(s->raw, irq, 1, raise); + } + } + s->level = deposit64(s->level, irq, 1, level); + aspeed_vic_update(s); +} + +static uint64_t aspeed_vic_read(void *opaque, hwaddr offset, unsigned size) +{ + uint64_t val; + const bool high = !!(offset & 0x4); + hwaddr n_offset = (offset & ~0x4); + AspeedVICState *s = (AspeedVICState *)opaque; + + if (offset < AVIC_NEW_BASE_OFFSET) { + qemu_log_mask(LOG_UNIMP, "%s: Ignoring read from legacy registers " + "at 0x%" HWADDR_PRIx "[%u]\n", __func__, offset, size); + return 0; + } + + n_offset -= AVIC_NEW_BASE_OFFSET; + + switch (n_offset) { + case 0x0: /* IRQ Status */ + val = s->raw & ~s->select & s->enable; + break; + case 0x08: /* FIQ Status */ + val = s->raw & s->select & s->enable; + break; + case 0x10: /* Raw Interrupt Status */ + val = s->raw; + break; + case 0x18: /* Interrupt Selection */ + val = s->select; + break; + case 0x20: /* Interrupt Enable */ + val = s->enable; + break; + case 0x30: /* Software Interrupt */ + val = s->trigger; + break; + case 0x40: /* Interrupt Sensitivity */ + val = s->sense; + break; + case 0x48: /* Interrupt Both Edge Trigger Control */ + val = s->dual_edge; + break; + case 0x50: /* Interrupt Event */ + val = s->event; + break; + case 0x60: /* Edge Triggered Interrupt Status */ + val = s->raw & ~s->sense; + break; + /* Illegal */ + case 0x28: /* Interrupt Enable Clear */ + case 0x38: /* Software Interrupt Clear */ + case 0x58: /* Edge Triggered Interrupt Clear */ + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Read of write-only register with offset 0x%" + HWADDR_PRIx "\n", __func__, offset); + val = 0; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad register at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + val = 0; + break; + } + if (high) { + val = extract64(val, 32, 19); + } + trace_aspeed_vic_read(offset, size, val); + return val; +} + +static void aspeed_vic_write(void *opaque, hwaddr offset, uint64_t data, + unsigned size) +{ + const bool high = !!(offset & 0x4); + hwaddr n_offset = (offset & ~0x4); + AspeedVICState *s = (AspeedVICState *)opaque; + + if (offset < AVIC_NEW_BASE_OFFSET) { + qemu_log_mask(LOG_UNIMP, + "%s: Ignoring write to legacy registers at 0x%" + HWADDR_PRIx "[%u] <- 0x%" PRIx64 "\n", __func__, offset, + size, data); + return; + } + + n_offset -= AVIC_NEW_BASE_OFFSET; + trace_aspeed_vic_write(offset, size, data); + + /* Given we have members using separate enable/clear registers, deposit64() + * isn't quite the tool for the job. Instead, relocate the incoming bits to + * the required bit offset based on the provided access address + */ + if (high) { + data &= AVIC_H_MASK; + data <<= 32; + } else { + data &= AVIC_L_MASK; + } + + switch (n_offset) { + case 0x18: /* Interrupt Selection */ + /* Register has deposit64() semantics - overwrite requested 32 bits */ + if (high) { + s->select &= AVIC_L_MASK; + } else { + s->select &= ((uint64_t) AVIC_H_MASK) << 32; + } + s->select |= data; + break; + case 0x20: /* Interrupt Enable */ + s->enable |= data; + break; + case 0x28: /* Interrupt Enable Clear */ + s->enable &= ~data; + break; + case 0x30: /* Software Interrupt */ + qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. " + "IRQs requested: 0x%016" PRIx64 "\n", __func__, data); + break; + case 0x38: /* Software Interrupt Clear */ + qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. " + "IRQs to be cleared: 0x%016" PRIx64 "\n", __func__, data); + break; + case 0x50: /* Interrupt Event */ + /* Register has deposit64() semantics - overwrite the top four valid + * IRQ bits, as only the top four IRQs (GPIOs) can change their event + * type */ + if (high) { + s->event &= ~AVIC_EVENT_W_MASK; + s->event |= (data & AVIC_EVENT_W_MASK); + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "Ignoring invalid write to interrupt event register"); + } + break; + case 0x58: /* Edge Triggered Interrupt Clear */ + s->raw &= ~(data & ~s->sense); + break; + case 0x00: /* IRQ Status */ + case 0x08: /* FIQ Status */ + case 0x10: /* Raw Interrupt Status */ + case 0x40: /* Interrupt Sensitivity */ + case 0x48: /* Interrupt Both Edge Trigger Control */ + case 0x60: /* Edge Triggered Interrupt Status */ + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Write of read-only register with offset 0x%" + HWADDR_PRIx "\n", __func__, offset); + break; + + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad register at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + break; + } + aspeed_vic_update(s); +} + +static const MemoryRegionOps aspeed_vic_ops = { + .read = aspeed_vic_read, + .write = aspeed_vic_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid.min_access_size = 4, + .valid.max_access_size = 4, + .valid.unaligned = false, +}; + +static void aspeed_vic_reset(DeviceState *dev) +{ + AspeedVICState *s = ASPEED_VIC(dev); + + s->level = 0; + s->raw = 0; + s->select = 0; + s->enable = 0; + s->trigger = 0; + s->sense = 0x1F07FFF8FFFFULL; + s->dual_edge = 0xF800070000ULL; + s->event = 0x5F07FFF8FFFFULL; +} + +#define AVIC_IO_REGION_SIZE 0x20000 + +static void aspeed_vic_realize(DeviceState *dev, Error **errp) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + AspeedVICState *s = ASPEED_VIC(dev); + + memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_vic_ops, s, + TYPE_ASPEED_VIC, AVIC_IO_REGION_SIZE); + + sysbus_init_mmio(sbd, &s->iomem); + + qdev_init_gpio_in(dev, aspeed_vic_set_irq, ASPEED_VIC_NR_IRQS); + sysbus_init_irq(sbd, &s->irq); + sysbus_init_irq(sbd, &s->fiq); +} + +static const VMStateDescription vmstate_aspeed_vic = { + .name = "aspeed.new-vic", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT64(level, AspeedVICState), + VMSTATE_UINT64(raw, AspeedVICState), + VMSTATE_UINT64(select, AspeedVICState), + VMSTATE_UINT64(enable, AspeedVICState), + VMSTATE_UINT64(trigger, AspeedVICState), + VMSTATE_UINT64(sense, AspeedVICState), + VMSTATE_UINT64(dual_edge, AspeedVICState), + VMSTATE_UINT64(event, AspeedVICState), + VMSTATE_END_OF_LIST() + } +}; + +static void aspeed_vic_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + dc->realize = aspeed_vic_realize; + dc->reset = aspeed_vic_reset; + dc->desc = "ASPEED Interrupt Controller (New)"; + dc->vmsd = &vmstate_aspeed_vic; +} + +static const TypeInfo aspeed_vic_info = { + .name = TYPE_ASPEED_VIC, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(AspeedVICState), + .class_init = aspeed_vic_class_init, +}; + +static void aspeed_vic_register_types(void) +{ + type_register_static(&aspeed_vic_info); +} + +type_init(aspeed_vic_register_types); |