diff options
Diffstat (limited to 'hw/a9mpcore.c')
| -rw-r--r-- | hw/a9mpcore.c | 189 |
1 files changed, 179 insertions, 10 deletions
diff --git a/hw/a9mpcore.c b/hw/a9mpcore.c index 6f108f4ce..cd2985f42 100644 --- a/hw/a9mpcore.c +++ b/hw/a9mpcore.c @@ -2,28 +2,197 @@ * Cortex-A9MPCore internal peripheral emulation. * * Copyright (c) 2009 CodeSourcery. - * Written by Paul Brook + * Copyright (c) 2011 Linaro Limited. + * Written by Paul Brook, Peter Maydell. * * This code is licensed under the GPL. */ -/* 64 external IRQ lines. */ +#include "sysbus.h" + +/* Configuration for arm_gic.c: + * number of external IRQ lines, max number of CPUs, how to ID current CPU + */ #define GIC_NIRQ 96 -#include "mpcore.c" +#define NCPU 4 + +static inline int +gic_get_current_cpu(void) +{ + return cpu_single_env->cpu_index; +} + +#include "arm_gic.c" + +/* A9MP private memory region. */ + +typedef struct a9mp_priv_state { + gic_state gic; + uint32_t scu_control; + uint32_t old_timer_status[8]; + uint32_t num_cpu; + qemu_irq *timer_irq; + MemoryRegion scu_iomem; + MemoryRegion ptimer_iomem; + MemoryRegion container; + DeviceState *mptimer; +} a9mp_priv_state; + +static uint64_t a9_scu_read(void *opaque, target_phys_addr_t offset, + unsigned size) +{ + a9mp_priv_state *s = (a9mp_priv_state *)opaque; + switch (offset) { + case 0x00: /* Control */ + return s->scu_control; + case 0x04: /* Configuration */ + return (((1 << s->num_cpu) - 1) << 4) | (s->num_cpu - 1); + case 0x08: /* CPU Power Status */ + return 0; + case 0x0c: /* Invalidate All Registers In Secure State */ + return 0; + case 0x40: /* Filtering Start Address Register */ + case 0x44: /* Filtering End Address Register */ + /* RAZ/WI, like an implementation with only one AXI master */ + return 0; + case 0x50: /* SCU Access Control Register */ + case 0x54: /* SCU Non-secure Access Control Register */ + /* unimplemented, fall through */ + default: + return 0; + } +} + +static void a9_scu_write(void *opaque, target_phys_addr_t offset, + uint64_t value, unsigned size) +{ + a9mp_priv_state *s = (a9mp_priv_state *)opaque; + switch (offset) { + case 0x00: /* Control */ + s->scu_control = value & 1; + break; + case 0x4: /* Configuration: RO */ + break; + case 0x0c: /* Invalidate All Registers In Secure State */ + /* no-op as we do not implement caches */ + break; + case 0x40: /* Filtering Start Address Register */ + case 0x44: /* Filtering End Address Register */ + /* RAZ/WI, like an implementation with only one AXI master */ + break; + case 0x8: /* CPU Power Status */ + case 0x50: /* SCU Access Control Register */ + case 0x54: /* SCU Non-secure Access Control Register */ + /* unimplemented, fall through */ + default: + break; + } +} + +static const MemoryRegionOps a9_scu_ops = { + .read = a9_scu_read, + .write = a9_scu_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void a9mpcore_timer_irq_handler(void *opaque, int irq, int level) +{ + a9mp_priv_state *s = (a9mp_priv_state *)opaque; + if (level && !s->old_timer_status[irq]) { + gic_set_pending_private(&s->gic, irq >> 1, 29 + (irq & 1)); + } + s->old_timer_status[irq] = level; +} + +static void a9mp_priv_reset(DeviceState *dev) +{ + a9mp_priv_state *s = FROM_SYSBUSGIC(a9mp_priv_state, sysbus_from_qdev(dev)); + int i; + s->scu_control = 0; + for (i = 0; i < ARRAY_SIZE(s->old_timer_status); i++) { + s->old_timer_status[i] = 0; + } +} + +static int a9mp_priv_init(SysBusDevice *dev) +{ + a9mp_priv_state *s = FROM_SYSBUSGIC(a9mp_priv_state, dev); + SysBusDevice *busdev; + int i; + + if (s->num_cpu > NCPU) { + hw_error("a9mp_priv_init: num-cpu may not be more than %d\n", NCPU); + } + + gic_init(&s->gic, s->num_cpu); + + s->mptimer = qdev_create(NULL, "arm_mptimer"); + qdev_prop_set_uint32(s->mptimer, "num-cpu", s->num_cpu); + qdev_init_nofail(s->mptimer); + busdev = sysbus_from_qdev(s->mptimer); + + /* Memory map (addresses are offsets from PERIPHBASE): + * 0x0000-0x00ff -- Snoop Control Unit + * 0x0100-0x01ff -- GIC CPU interface + * 0x0200-0x02ff -- Global Timer + * 0x0300-0x05ff -- nothing + * 0x0600-0x06ff -- private timers and watchdogs + * 0x0700-0x0fff -- nothing + * 0x1000-0x1fff -- GIC Distributor + * + * We should implement the global timer but don't currently do so. + */ + memory_region_init(&s->container, "a9mp-priv-container", 0x2000); + memory_region_init_io(&s->scu_iomem, &a9_scu_ops, s, "a9mp-scu", 0x100); + memory_region_add_subregion(&s->container, 0, &s->scu_iomem); + /* GIC CPU interface */ + memory_region_add_subregion(&s->container, 0x100, &s->gic.cpuiomem[0]); + /* Note that the A9 exposes only the "timer/watchdog for this core" + * memory region, not the "timer/watchdog for core X" ones 11MPcore has. + */ + memory_region_add_subregion(&s->container, 0x600, + sysbus_mmio_get_region(busdev, 0)); + memory_region_add_subregion(&s->container, 0x620, + sysbus_mmio_get_region(busdev, 1)); + memory_region_add_subregion(&s->container, 0x1000, &s->gic.iomem); + + sysbus_init_mmio(dev, &s->container); + + /* Wire up the interrupt from each watchdog and timer. */ + s->timer_irq = qemu_allocate_irqs(a9mpcore_timer_irq_handler, + s, (s->num_cpu + 1) * 2); + for (i = 0; i < s->num_cpu * 2; i++) { + sysbus_connect_irq(busdev, i, s->timer_irq[i]); + } + return 0; +} + +static const VMStateDescription vmstate_a9mp_priv = { + .name = "a9mpcore_priv", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32(scu_control, a9mp_priv_state), + VMSTATE_UINT32_ARRAY(old_timer_status, a9mp_priv_state, 8), + VMSTATE_END_OF_LIST() + } +}; -static SysBusDeviceInfo mpcore_priv_info = { - .init = mpcore_priv_init, +static SysBusDeviceInfo a9mp_priv_info = { + .init = a9mp_priv_init, .qdev.name = "a9mpcore_priv", - .qdev.size = sizeof(mpcore_priv_state), + .qdev.size = sizeof(a9mp_priv_state), + .qdev.vmsd = &vmstate_a9mp_priv, + .qdev.reset = a9mp_priv_reset, .qdev.props = (Property[]) { - DEFINE_PROP_UINT32("num-cpu", mpcore_priv_state, num_cpu, 1), + DEFINE_PROP_UINT32("num-cpu", a9mp_priv_state, num_cpu, 1), DEFINE_PROP_END_OF_LIST(), } }; -static void a9mpcore_register_devices(void) +static void a9mp_register_devices(void) { - sysbus_register_withprop(&mpcore_priv_info); + sysbus_register_withprop(&a9mp_priv_info); } -device_init(a9mpcore_register_devices) +device_init(a9mp_register_devices) |