hw/a9mpcore.c

   1 /*
   2  * Cortex-A9MPCore internal peripheral emulation.
   3  *
   4  * Copyright (c) 2009 CodeSourcery.
   5  * Copyright (c) 2011 Linaro Limited.
   6  * Written by Paul Brook, Peter Maydell.
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "sysbus.h"
  12
  13 /* A9MP private memory region.  */
  14
  15 typedef struct a9mp_priv_state {
  16     SysBusDevice busdev;
  17     uint32_t scu_control;
  18     uint32_t scu_status;
  19     uint32_t old_timer_status[8];
  20     uint32_t num_cpu;
  21     MemoryRegion scu_iomem;
  22     MemoryRegion ptimer_iomem;
  23     MemoryRegion container;
  24     DeviceState *mptimer;
  25     DeviceState *gic;
  26     uint32_t num_irq;
  27 } a9mp_priv_state;
  28
  29 static uint64_t a9_scu_read(void *opaque, hwaddr offset,
  30                             unsigned size)
  31 {
  32     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
  33     switch (offset) {
  34     case 0x00: /* Control */
  35         return s->scu_control;
  36     case 0x04: /* Configuration */
  37         return (((1 << s->num_cpu) - 1) << 4) | (s->num_cpu - 1);
  38     case 0x08: /* CPU Power Status */
  39         return s->scu_status;
  40     case 0x09: /* CPU status.  */
  41         return s->scu_status >> 8;
  42     case 0x0a: /* CPU status.  */
  43         return s->scu_status >> 16;
  44     case 0x0b: /* CPU status.  */
  45         return s->scu_status >> 24;
  46     case 0x0c: /* Invalidate All Registers In Secure State */
  47         return 0;
  48     case 0x40: /* Filtering Start Address Register */
  49     case 0x44: /* Filtering End Address Register */
  50         /* RAZ/WI, like an implementation with only one AXI master */
  51         return 0;
  52     case 0x50: /* SCU Access Control Register */
  53     case 0x54: /* SCU Non-secure Access Control Register */
  54         /* unimplemented, fall through */
  55     default:
  56         return 0;
  57     }
  58 }
  59
  60 static void a9_scu_write(void *opaque, hwaddr offset,
  61                          uint64_t value, unsigned size)
  62 {
  63     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
  64     uint32_t mask;
  65     uint32_t shift;
  66     switch (size) {
  67     case 1:
  68         mask = 0xff;
  69         break;
  70     case 2:
  71         mask = 0xffff;
  72         break;
  73     case 4:
  74         mask = 0xffffffff;
  75         break;
  76     default:
  77         fprintf(stderr, "Invalid size %u in write to a9 scu register %x\n",
  78                 size, (unsigned)offset);
  79         return;
  80     }
  81
  82     switch (offset) {
  83     case 0x00: /* Control */
  84         s->scu_control = value & 1;
  85         break;
  86     case 0x4: /* Configuration: RO */
  87         break;
  88     case 0x08: case 0x09: case 0x0A: case 0x0B: /* Power Control */
  89         shift = (offset - 0x8) * 8;
  90         s->scu_status &= ~(mask << shift);
  91         s->scu_status |= ((value & mask) << shift);
  92         break;
  93     case 0x0c: /* Invalidate All Registers In Secure State */
  94         /* no-op as we do not implement caches */
  95         break;
  96     case 0x40: /* Filtering Start Address Register */
  97     case 0x44: /* Filtering End Address Register */
  98         /* RAZ/WI, like an implementation with only one AXI master */
  99         break;
 100     case 0x50: /* SCU Access Control Register */
 101     case 0x54: /* SCU Non-secure Access Control Register */
 102         /* unimplemented, fall through */
 103     default:
 104         break;
 105     }
 106 }
 107
 108 static const MemoryRegionOps a9_scu_ops = {
 109     .read = a9_scu_read,
 110     .write = a9_scu_write,
 111     .endianness = DEVICE_NATIVE_ENDIAN,
 112 };
 113
 114 static void a9mp_priv_reset(DeviceState *dev)
 115 {
 116     a9mp_priv_state *s = FROM_SYSBUS(a9mp_priv_state, sysbus_from_qdev(dev));
 117     int i;
 118     s->scu_control = 0;
 119     for (i = 0; i < ARRAY_SIZE(s->old_timer_status); i++) {
 120         s->old_timer_status[i] = 0;
 121     }
 122 }
 123
 124 static void a9mp_priv_set_irq(void *opaque, int irq, int level)
 125 {
 126     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
 127     qemu_set_irq(qdev_get_gpio_in(s->gic, irq), level);
 128 }
 129
 130 static int a9mp_priv_init(SysBusDevice *dev)
 131 {
 132     a9mp_priv_state *s = FROM_SYSBUS(a9mp_priv_state, dev);
 133     SysBusDevice *busdev, *gicbusdev;
 134     int i;
 135
 136     s->gic = qdev_create(NULL, "arm_gic");
 137     qdev_prop_set_uint32(s->gic, "num-cpu", s->num_cpu);
 138     qdev_prop_set_uint32(s->gic, "num-irq", s->num_irq);
 139     qdev_init_nofail(s->gic);
 140     gicbusdev = sysbus_from_qdev(s->gic);
 141
 142     /* Pass through outbound IRQ lines from the GIC */
 143     sysbus_pass_irq(dev, gicbusdev);
 144
 145     /* Pass through inbound GPIO lines to the GIC */
 146     qdev_init_gpio_in(&s->busdev.qdev, a9mp_priv_set_irq, s->num_irq - 32);
 147
 148     s->mptimer = qdev_create(NULL, "arm_mptimer");
 149     qdev_prop_set_uint32(s->mptimer, "num-cpu", s->num_cpu);
 150     qdev_init_nofail(s->mptimer);
 151     busdev = sysbus_from_qdev(s->mptimer);
 152
 153     /* Memory map (addresses are offsets from PERIPHBASE):
 154      *  0x0000-0x00ff -- Snoop Control Unit
 155      *  0x0100-0x01ff -- GIC CPU interface
 156      *  0x0200-0x02ff -- Global Timer
 157      *  0x0300-0x05ff -- nothing
 158      *  0x0600-0x06ff -- private timers and watchdogs
 159      *  0x0700-0x0fff -- nothing
 160      *  0x1000-0x1fff -- GIC Distributor
 161      *
 162      * We should implement the global timer but don't currently do so.
 163      */
 164     memory_region_init(&s->container, "a9mp-priv-container", 0x2000);
 165     memory_region_init_io(&s->scu_iomem, &a9_scu_ops, s, "a9mp-scu", 0x100);
 166     memory_region_add_subregion(&s->container, 0, &s->scu_iomem);
 167     /* GIC CPU interface */
 168     memory_region_add_subregion(&s->container, 0x100,
 169                                 sysbus_mmio_get_region(gicbusdev, 1));
 170     /* Note that the A9 exposes only the "timer/watchdog for this core"
 171      * memory region, not the "timer/watchdog for core X" ones 11MPcore has.
 172      */
 173     memory_region_add_subregion(&s->container, 0x600,
 174                                 sysbus_mmio_get_region(busdev, 0));
 175     memory_region_add_subregion(&s->container, 0x620,
 176                                 sysbus_mmio_get_region(busdev, 1));
 177     memory_region_add_subregion(&s->container, 0x1000,
 178                                 sysbus_mmio_get_region(gicbusdev, 0));
 179
 180     sysbus_init_mmio(dev, &s->container);
 181
 182     /* Wire up the interrupt from each watchdog and timer.
 183      * For each core the timer is PPI 29 and the watchdog PPI 30.
 184      */
 185     for (i = 0; i < s->num_cpu; i++) {
 186         int ppibase = (s->num_irq - 32) + i * 32;
 187         sysbus_connect_irq(busdev, i * 2,
 188                            qdev_get_gpio_in(s->gic, ppibase + 29));
 189         sysbus_connect_irq(busdev, i * 2 + 1,
 190                            qdev_get_gpio_in(s->gic, ppibase + 30));
 191     }
 192     return 0;
 193 }
 194
 195 static const VMStateDescription vmstate_a9mp_priv = {
 196     .name = "a9mpcore_priv",
 197     .version_id = 2,
 198     .minimum_version_id = 1,
 199     .fields = (VMStateField[]) {
 200         VMSTATE_UINT32(scu_control, a9mp_priv_state),
 201         VMSTATE_UINT32_ARRAY(old_timer_status, a9mp_priv_state, 8),
 202         VMSTATE_UINT32_V(scu_status, a9mp_priv_state, 2),
 203         VMSTATE_END_OF_LIST()
 204     }
 205 };
 206
 207 static Property a9mp_priv_properties[] = {
 208     DEFINE_PROP_UINT32("num-cpu", a9mp_priv_state, num_cpu, 1),
 209     /* The Cortex-A9MP may have anything from 0 to 224 external interrupt
 210      * IRQ lines (with another 32 internal). We default to 64+32, which
 211      * is the number provided by the Cortex-A9MP test chip in the
 212      * Realview PBX-A9 and Versatile Express A9 development boards.
 213      * Other boards may differ and should set this property appropriately.
 214      */
 215     DEFINE_PROP_UINT32("num-irq", a9mp_priv_state, num_irq, 96),
 216     DEFINE_PROP_END_OF_LIST(),
 217 };
 218
 219 static void a9mp_priv_class_init(ObjectClass *klass, void *data)
 220 {
 221     DeviceClass *dc = DEVICE_CLASS(klass);
 222     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 223
 224     k->init = a9mp_priv_init;
 225     dc->props = a9mp_priv_properties;
 226     dc->vmsd = &vmstate_a9mp_priv;
 227     dc->reset = a9mp_priv_reset;
 228 }
 229
 230 static TypeInfo a9mp_priv_info = {
 231     .name          = "a9mpcore_priv",
 232     .parent        = TYPE_SYS_BUS_DEVICE,
 233     .instance_size = sizeof(a9mp_priv_state),
 234     .class_init    = a9mp_priv_class_init,
 235 };
 236
 237 static void a9mp_register_types(void)
 238 {
 239     type_register_static(&a9mp_priv_info);
 240 }
 241
 242 type_init(a9mp_register_types)