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 A9MPPrivState {
  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 container;
  23     DeviceState *mptimer;
  24     DeviceState *gic;
  25     uint32_t num_irq;
  26 } A9MPPrivState;
  27
  28 static uint64_t a9_scu_read(void *opaque, hwaddr offset,
  29                             unsigned size)
  30 {
  31     A9MPPrivState *s = (A9MPPrivState *)opaque;
  32     switch (offset) {
  33     case 0x00: /* Control */
  34         return s->scu_control;
  35     case 0x04: /* Configuration */
  36         return (((1 << s->num_cpu) - 1) << 4) | (s->num_cpu - 1);
  37     case 0x08: /* CPU Power Status */
  38         return s->scu_status;
  39     case 0x09: /* CPU status.  */
  40         return s->scu_status >> 8;
  41     case 0x0a: /* CPU status.  */
  42         return s->scu_status >> 16;
  43     case 0x0b: /* CPU status.  */
  44         return s->scu_status >> 24;
  45     case 0x0c: /* Invalidate All Registers In Secure State */
  46         return 0;
  47     case 0x40: /* Filtering Start Address Register */
  48     case 0x44: /* Filtering End Address Register */
  49         /* RAZ/WI, like an implementation with only one AXI master */
  50         return 0;
  51     case 0x50: /* SCU Access Control Register */
  52     case 0x54: /* SCU Non-secure Access Control Register */
  53         /* unimplemented, fall through */
  54     default:
  55         return 0;
  56     }
  57 }
  58
  59 static void a9_scu_write(void *opaque, hwaddr offset,
  60                          uint64_t value, unsigned size)
  61 {
  62     A9MPPrivState *s = (A9MPPrivState *)opaque;
  63     uint32_t mask;
  64     uint32_t shift;
  65     switch (size) {
  66     case 1:
  67         mask = 0xff;
  68         break;
  69     case 2:
  70         mask = 0xffff;
  71         break;
  72     case 4:
  73         mask = 0xffffffff;
  74         break;
  75     default:
  76         fprintf(stderr, "Invalid size %u in write to a9 scu register %x\n",
  77                 size, (unsigned)offset);
  78         return;
  79     }
  80
  81     switch (offset) {
  82     case 0x00: /* Control */
  83         s->scu_control = value & 1;
  84         break;
  85     case 0x4: /* Configuration: RO */
  86         break;
  87     case 0x08: case 0x09: case 0x0A: case 0x0B: /* Power Control */
  88         shift = (offset - 0x8) * 8;
  89         s->scu_status &= ~(mask << shift);
  90         s->scu_status |= ((value & mask) << shift);
  91         break;
  92     case 0x0c: /* Invalidate All Registers In Secure State */
  93         /* no-op as we do not implement caches */
  94         break;
  95     case 0x40: /* Filtering Start Address Register */
  96     case 0x44: /* Filtering End Address Register */
  97         /* RAZ/WI, like an implementation with only one AXI master */
  98         break;
  99     case 0x50: /* SCU Access Control Register */
 100     case 0x54: /* SCU Non-secure Access Control Register */
 101         /* unimplemented, fall through */
 102     default:
 103         break;
 104     }
 105 }
 106
 107 static const MemoryRegionOps a9_scu_ops = {
 108     .read = a9_scu_read,
 109     .write = a9_scu_write,
 110     .endianness = DEVICE_NATIVE_ENDIAN,
 111 };
 112
 113 static void a9mp_priv_reset(DeviceState *dev)
 114 {
 115     A9MPPrivState *s = FROM_SYSBUS(A9MPPrivState, SYS_BUS_DEVICE(dev));
 116     int i;
 117     s->scu_control = 0;
 118     for (i = 0; i < ARRAY_SIZE(s->old_timer_status); i++) {
 119         s->old_timer_status[i] = 0;
 120     }
 121 }
 122
 123 static void a9mp_priv_set_irq(void *opaque, int irq, int level)
 124 {
 125     A9MPPrivState *s = (A9MPPrivState *)opaque;
 126     qemu_set_irq(qdev_get_gpio_in(s->gic, irq), level);
 127 }
 128
 129 static int a9mp_priv_init(SysBusDevice *dev)
 130 {
 131     A9MPPrivState *s = FROM_SYSBUS(A9MPPrivState, dev);
 132     SysBusDevice *busdev, *gicbusdev;
 133     int i;
 134
 135     s->gic = qdev_create(NULL, "arm_gic");
 136     qdev_prop_set_uint32(s->gic, "num-cpu", s->num_cpu);
 137     qdev_prop_set_uint32(s->gic, "num-irq", s->num_irq);
 138     qdev_init_nofail(s->gic);
 139     gicbusdev = SYS_BUS_DEVICE(s->gic);
 140
 141     /* Pass through outbound IRQ lines from the GIC */
 142     sysbus_pass_irq(dev, gicbusdev);
 143
 144     /* Pass through inbound GPIO lines to the GIC */
 145     qdev_init_gpio_in(&s->busdev.qdev, a9mp_priv_set_irq, s->num_irq - 32);
 146
 147     s->mptimer = qdev_create(NULL, "arm_mptimer");
 148     qdev_prop_set_uint32(s->mptimer, "num-cpu", s->num_cpu);
 149     qdev_init_nofail(s->mptimer);
 150     busdev = SYS_BUS_DEVICE(s->mptimer);
 151
 152     /* Memory map (addresses are offsets from PERIPHBASE):
 153      *  0x0000-0x00ff -- Snoop Control Unit
 154      *  0x0100-0x01ff -- GIC CPU interface
 155      *  0x0200-0x02ff -- Global Timer
 156      *  0x0300-0x05ff -- nothing
 157      *  0x0600-0x06ff -- private timers and watchdogs
 158      *  0x0700-0x0fff -- nothing
 159      *  0x1000-0x1fff -- GIC Distributor
 160      *
 161      * We should implement the global timer but don't currently do so.
 162      */
 163     memory_region_init(&s->container, "a9mp-priv-container", 0x2000);
 164     memory_region_init_io(&s->scu_iomem, &a9_scu_ops, s, "a9mp-scu", 0x100);
 165     memory_region_add_subregion(&s->container, 0, &s->scu_iomem);
 166     /* GIC CPU interface */
 167     memory_region_add_subregion(&s->container, 0x100,
 168                                 sysbus_mmio_get_region(gicbusdev, 1));
 169     /* Note that the A9 exposes only the "timer/watchdog for this core"
 170      * memory region, not the "timer/watchdog for core X" ones 11MPcore has.
 171      */
 172     memory_region_add_subregion(&s->container, 0x600,
 173                                 sysbus_mmio_get_region(busdev, 0));
 174     memory_region_add_subregion(&s->container, 0x620,
 175                                 sysbus_mmio_get_region(busdev, 1));
 176     memory_region_add_subregion(&s->container, 0x1000,
 177                                 sysbus_mmio_get_region(gicbusdev, 0));
 178
 179     sysbus_init_mmio(dev, &s->container);
 180
 181     /* Wire up the interrupt from each watchdog and timer.
 182      * For each core the timer is PPI 29 and the watchdog PPI 30.
 183      */
 184     for (i = 0; i < s->num_cpu; i++) {
 185         int ppibase = (s->num_irq - 32) + i * 32;
 186         sysbus_connect_irq(busdev, i * 2,
 187                            qdev_get_gpio_in(s->gic, ppibase + 29));
 188         sysbus_connect_irq(busdev, i * 2 + 1,
 189                            qdev_get_gpio_in(s->gic, ppibase + 30));
 190     }
 191     return 0;
 192 }
 193
 194 static const VMStateDescription vmstate_a9mp_priv = {
 195     .name = "a9mpcore_priv",
 196     .version_id = 2,
 197     .minimum_version_id = 1,
 198     .fields = (VMStateField[]) {
 199         VMSTATE_UINT32(scu_control, A9MPPrivState),
 200         VMSTATE_UINT32_ARRAY(old_timer_status, A9MPPrivState, 8),
 201         VMSTATE_UINT32_V(scu_status, A9MPPrivState, 2),
 202         VMSTATE_END_OF_LIST()
 203     }
 204 };
 205
 206 static Property a9mp_priv_properties[] = {
 207     DEFINE_PROP_UINT32("num-cpu", A9MPPrivState, num_cpu, 1),
 208     /* The Cortex-A9MP may have anything from 0 to 224 external interrupt
 209      * IRQ lines (with another 32 internal). We default to 64+32, which
 210      * is the number provided by the Cortex-A9MP test chip in the
 211      * Realview PBX-A9 and Versatile Express A9 development boards.
 212      * Other boards may differ and should set this property appropriately.
 213      */
 214     DEFINE_PROP_UINT32("num-irq", A9MPPrivState, num_irq, 96),
 215     DEFINE_PROP_END_OF_LIST(),
 216 };
 217
 218 static void a9mp_priv_class_init(ObjectClass *klass, void *data)
 219 {
 220     DeviceClass *dc = DEVICE_CLASS(klass);
 221     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 222
 223     k->init = a9mp_priv_init;
 224     dc->props = a9mp_priv_properties;
 225     dc->vmsd = &vmstate_a9mp_priv;
 226     dc->reset = a9mp_priv_reset;
 227 }
 228
 229 static const TypeInfo a9mp_priv_info = {
 230     .name          = "a9mpcore_priv",
 231     .parent        = TYPE_SYS_BUS_DEVICE,
 232     .instance_size = sizeof(A9MPPrivState),
 233     .class_init    = a9mp_priv_class_init,
 234 };
 235
 236 static void a9mp_register_types(void)
 237 {
 238     type_register_static(&a9mp_priv_info);
 239 }
 240
 241 type_init(a9mp_register_types)