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 /* Configuration for arm_gic.c:
  14  * max number of CPUs, how to ID current CPU
  15  */
  16 #define NCPU 4
  17
  18 static inline int
  19 gic_get_current_cpu(void)
  20 {
  21   return cpu_single_env->cpu_index;
  22 }
  23
  24 #include "arm_gic.c"
  25
  26 /* A9MP private memory region.  */
  27
  28 typedef struct a9mp_priv_state {
  29     gic_state gic;
  30     uint32_t scu_control;
  31     uint32_t scu_status;
  32     uint32_t old_timer_status[8];
  33     uint32_t num_cpu;
  34     qemu_irq *timer_irq;
  35     MemoryRegion scu_iomem;
  36     MemoryRegion ptimer_iomem;
  37     MemoryRegion container;
  38     DeviceState *mptimer;
  39     uint32_t num_irq;
  40 } a9mp_priv_state;
  41
  42 static uint64_t a9_scu_read(void *opaque, target_phys_addr_t offset,
  43                             unsigned size)
  44 {
  45     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
  46     switch (offset) {
  47     case 0x00: /* Control */
  48         return s->scu_control;
  49     case 0x04: /* Configuration */
  50         return (((1 << s->num_cpu) - 1) << 4) | (s->num_cpu - 1);
  51     case 0x08: /* CPU Power Status */
  52         return s->scu_status;
  53     case 0x09: /* CPU status.  */
  54         return s->scu_status >> 8;
  55     case 0x0a: /* CPU status.  */
  56         return s->scu_status >> 16;
  57     case 0x0b: /* CPU status.  */
  58         return s->scu_status >> 24;
  59     case 0x0c: /* Invalidate All Registers In Secure State */
  60         return 0;
  61     case 0x40: /* Filtering Start Address Register */
  62     case 0x44: /* Filtering End Address Register */
  63         /* RAZ/WI, like an implementation with only one AXI master */
  64         return 0;
  65     case 0x50: /* SCU Access Control Register */
  66     case 0x54: /* SCU Non-secure Access Control Register */
  67         /* unimplemented, fall through */
  68     default:
  69         return 0;
  70     }
  71 }
  72
  73 static void a9_scu_write(void *opaque, target_phys_addr_t offset,
  74                          uint64_t value, unsigned size)
  75 {
  76     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
  77     uint32_t mask;
  78     uint32_t shift;
  79     switch (size) {
  80     case 1:
  81         mask = 0xff;
  82         break;
  83     case 2:
  84         mask = 0xffff;
  85         break;
  86     case 4:
  87         mask = 0xffffffff;
  88         break;
  89     default:
  90         fprintf(stderr, "Invalid size %u in write to a9 scu register %x\n",
  91                 size, offset);
  92         return;
  93     }
  94
  95     switch (offset) {
  96     case 0x00: /* Control */
  97         s->scu_control = value & 1;
  98         break;
  99     case 0x4: /* Configuration: RO */
 100         break;
 101     case 0x08: case 0x09: case 0x0A: case 0x0B: /* Power Control */
 102         shift = (offset - 0x8) * 8;
 103         s->scu_status &= ~(mask << shift);
 104         s->scu_status |= ((value & mask) << shift);
 105         break;
 106     case 0x0c: /* Invalidate All Registers In Secure State */
 107         /* no-op as we do not implement caches */
 108         break;
 109     case 0x40: /* Filtering Start Address Register */
 110     case 0x44: /* Filtering End Address Register */
 111         /* RAZ/WI, like an implementation with only one AXI master */
 112         break;
 113     case 0x50: /* SCU Access Control Register */
 114     case 0x54: /* SCU Non-secure Access Control Register */
 115         /* unimplemented, fall through */
 116     default:
 117         break;
 118     }
 119 }
 120
 121 static const MemoryRegionOps a9_scu_ops = {
 122     .read = a9_scu_read,
 123     .write = a9_scu_write,
 124     .endianness = DEVICE_NATIVE_ENDIAN,
 125 };
 126
 127 static void a9mpcore_timer_irq_handler(void *opaque, int irq, int level)
 128 {
 129     a9mp_priv_state *s = (a9mp_priv_state *)opaque;
 130     if (level && !s->old_timer_status[irq]) {
 131         gic_set_pending_private(&s->gic, irq >> 1, 29 + (irq & 1));
 132     }
 133     s->old_timer_status[irq] = level;
 134 }
 135
 136 static void a9mp_priv_reset(DeviceState *dev)
 137 {
 138     a9mp_priv_state *s = FROM_SYSBUSGIC(a9mp_priv_state, sysbus_from_qdev(dev));
 139     int i;
 140     s->scu_control = 0;
 141     for (i = 0; i < ARRAY_SIZE(s->old_timer_status); i++) {
 142         s->old_timer_status[i] = 0;
 143     }
 144 }
 145
 146 static int a9mp_priv_init(SysBusDevice *dev)
 147 {
 148     a9mp_priv_state *s = FROM_SYSBUSGIC(a9mp_priv_state, dev);
 149     SysBusDevice *busdev;
 150     int i;
 151
 152     if (s->num_cpu > NCPU) {
 153         hw_error("a9mp_priv_init: num-cpu may not be more than %d\n", NCPU);
 154     }
 155
 156     gic_init(&s->gic, s->num_cpu, s->num_irq);
 157
 158     s->mptimer = qdev_create(NULL, "arm_mptimer");
 159     qdev_prop_set_uint32(s->mptimer, "num-cpu", s->num_cpu);
 160     qdev_init_nofail(s->mptimer);
 161     busdev = sysbus_from_qdev(s->mptimer);
 162
 163     /* Memory map (addresses are offsets from PERIPHBASE):
 164      *  0x0000-0x00ff -- Snoop Control Unit
 165      *  0x0100-0x01ff -- GIC CPU interface
 166      *  0x0200-0x02ff -- Global Timer
 167      *  0x0300-0x05ff -- nothing
 168      *  0x0600-0x06ff -- private timers and watchdogs
 169      *  0x0700-0x0fff -- nothing
 170      *  0x1000-0x1fff -- GIC Distributor
 171      *
 172      * We should implement the global timer but don't currently do so.
 173      */
 174     memory_region_init(&s->container, "a9mp-priv-container", 0x2000);
 175     memory_region_init_io(&s->scu_iomem, &a9_scu_ops, s, "a9mp-scu", 0x100);
 176     memory_region_add_subregion(&s->container, 0, &s->scu_iomem);
 177     /* GIC CPU interface */
 178     memory_region_add_subregion(&s->container, 0x100, &s->gic.cpuiomem[0]);
 179     /* Note that the A9 exposes only the "timer/watchdog for this core"
 180      * memory region, not the "timer/watchdog for core X" ones 11MPcore has.
 181      */
 182     memory_region_add_subregion(&s->container, 0x600,
 183                                 sysbus_mmio_get_region(busdev, 0));
 184     memory_region_add_subregion(&s->container, 0x620,
 185                                 sysbus_mmio_get_region(busdev, 1));
 186     memory_region_add_subregion(&s->container, 0x1000, &s->gic.iomem);
 187
 188     sysbus_init_mmio(dev, &s->container);
 189
 190     /* Wire up the interrupt from each watchdog and timer. */
 191     s->timer_irq = qemu_allocate_irqs(a9mpcore_timer_irq_handler,
 192                                       s, (s->num_cpu + 1) * 2);
 193     for (i = 0; i < s->num_cpu * 2; i++) {
 194         sysbus_connect_irq(busdev, i, s->timer_irq[i]);
 195     }
 196     return 0;
 197 }
 198
 199 static const VMStateDescription vmstate_a9mp_priv = {
 200     .name = "a9mpcore_priv",
 201     .version_id = 2,
 202     .minimum_version_id = 1,
 203     .fields = (VMStateField[]) {
 204         VMSTATE_UINT32(scu_control, a9mp_priv_state),
 205         VMSTATE_UINT32_ARRAY(old_timer_status, a9mp_priv_state, 8),
 206         VMSTATE_UINT32_V(scu_status, a9mp_priv_state, 2),
 207         VMSTATE_END_OF_LIST()
 208     }
 209 };
 210
 211 static SysBusDeviceInfo a9mp_priv_info = {
 212     .init = a9mp_priv_init,
 213     .qdev.name  = "a9mpcore_priv",
 214     .qdev.size  = sizeof(a9mp_priv_state),
 215     .qdev.vmsd = &vmstate_a9mp_priv,
 216     .qdev.reset = a9mp_priv_reset,
 217     .qdev.props = (Property[]) {
 218         DEFINE_PROP_UINT32("num-cpu", a9mp_priv_state, num_cpu, 1),
 219         /* The Cortex-A9MP may have anything from 0 to 224 external interrupt
 220          * IRQ lines (with another 32 internal). We default to 64+32, which
 221          * is the number provided by the Cortex-A9MP test chip in the
 222          * Realview PBX-A9 and Versatile Express A9 development boards.
 223          * Other boards may differ and should set this property appropriately.
 224          */
 225         DEFINE_PROP_UINT32("num-irq", a9mp_priv_state, num_irq, 96),
 226         DEFINE_PROP_END_OF_LIST(),
 227     }
 228 };
 229
 230 static void a9mp_register_devices(void)
 231 {
 232     sysbus_register_withprop(&a9mp_priv_info);
 233 }
 234
 235 device_init(a9mp_register_devices)