hw/misc/bcm2835_property.c

   1 /*
   2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
   3  * This code is licensed under the GNU GPLv2 and later.
   4  */
   5
   6 #include "hw/misc/bcm2835_property.h"
   7 #include "hw/misc/bcm2835_mbox_defs.h"
   8 #include "sysemu/dma.h"
   9
  10 /* https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface */
  11
  12 static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
  13 {
  14     uint32_t tag;
  15     uint32_t bufsize;
  16     uint32_t tot_len;
  17     size_t resplen;
  18     uint32_t tmp;
  19
  20     value &= ~0xf;
  21
  22     s->addr = value;
  23
  24     tot_len = ldl_phys(&s->dma_as, value);
  25
  26     /* @(addr + 4) : Buffer response code */
  27     value = s->addr + 8;
  28     while (value + 8 <= s->addr + tot_len) {
  29         tag = ldl_phys(&s->dma_as, value);
  30         bufsize = ldl_phys(&s->dma_as, value + 4);
  31         /* @(value + 8) : Request/response indicator */
  32         resplen = 0;
  33         switch (tag) {
  34         case 0x00000000: /* End tag */
  35             break;
  36         case 0x00000001: /* Get firmware revision */
  37             stl_phys(&s->dma_as, value + 12, 346337);
  38             resplen = 4;
  39             break;
  40         case 0x00010001: /* Get board model */
  41             qemu_log_mask(LOG_UNIMP,
  42                           "bcm2835_property: %x get board model NYI\n", tag);
  43             resplen = 4;
  44             break;
  45         case 0x00010002: /* Get board revision */
  46             qemu_log_mask(LOG_UNIMP,
  47                           "bcm2835_property: %x get board revision NYI\n", tag);
  48             resplen = 4;
  49             break;
  50         case 0x00010003: /* Get board MAC address */
  51             resplen = sizeof(s->macaddr.a);
  52             dma_memory_write(&s->dma_as, value + 12, s->macaddr.a, resplen);
  53             break;
  54         case 0x00010004: /* Get board serial */
  55             qemu_log_mask(LOG_UNIMP,
  56                           "bcm2835_property: %x get board serial NYI\n", tag);
  57             resplen = 8;
  58             break;
  59         case 0x00010005: /* Get ARM memory */
  60             /* base */
  61             stl_phys(&s->dma_as, value + 12, 0);
  62             /* size */
  63             stl_phys(&s->dma_as, value + 16, s->ram_size);
  64             resplen = 8;
  65             break;
  66         case 0x00028001: /* Set power state */
  67             /* Assume that whatever device they asked for exists,
  68              * and we'll just claim we set it to the desired state
  69              */
  70             tmp = ldl_phys(&s->dma_as, value + 16);
  71             stl_phys(&s->dma_as, value + 16, (tmp & 1));
  72             resplen = 8;
  73             break;
  74
  75         /* Clocks */
  76
  77         case 0x00030001: /* Get clock state */
  78             stl_phys(&s->dma_as, value + 16, 0x1);
  79             resplen = 8;
  80             break;
  81
  82         case 0x00038001: /* Set clock state */
  83             qemu_log_mask(LOG_UNIMP,
  84                           "bcm2835_property: %x set clock state NYI\n", tag);
  85             resplen = 8;
  86             break;
  87
  88         case 0x00030002: /* Get clock rate */
  89         case 0x00030004: /* Get max clock rate */
  90         case 0x00030007: /* Get min clock rate */
  91             switch (ldl_phys(&s->dma_as, value + 12)) {
  92             case 1: /* EMMC */
  93                 stl_phys(&s->dma_as, value + 16, 50000000);
  94                 break;
  95             case 2: /* UART */
  96                 stl_phys(&s->dma_as, value + 16, 3000000);
  97                 break;
  98             default:
  99                 stl_phys(&s->dma_as, value + 16, 700000000);
 100                 break;
 101             }
 102             resplen = 8;
 103             break;
 104
 105         case 0x00038002: /* Set clock rate */
 106         case 0x00038004: /* Set max clock rate */
 107         case 0x00038007: /* Set min clock rate */
 108             qemu_log_mask(LOG_UNIMP,
 109                           "bcm2835_property: %x set clock rates NYI\n", tag);
 110             resplen = 8;
 111             break;
 112
 113         /* Temperature */
 114
 115         case 0x00030006: /* Get temperature */
 116             stl_phys(&s->dma_as, value + 16, 25000);
 117             resplen = 8;
 118             break;
 119
 120         case 0x0003000A: /* Get max temperature */
 121             stl_phys(&s->dma_as, value + 16, 99000);
 122             resplen = 8;
 123             break;
 124
 125
 126         case 0x00060001: /* Get DMA channels */
 127             /* channels 2-5 */
 128             stl_phys(&s->dma_as, value + 12, 0x003C);
 129             resplen = 4;
 130             break;
 131
 132         case 0x00050001: /* Get command line */
 133             resplen = 0;
 134             break;
 135
 136         default:
 137             qemu_log_mask(LOG_GUEST_ERROR,
 138                           "bcm2835_property: unhandled tag %08x\n", tag);
 139             break;
 140         }
 141
 142         if (tag == 0) {
 143             break;
 144         }
 145
 146         stl_phys(&s->dma_as, value + 8, (1 << 31) | resplen);
 147         value += bufsize + 12;
 148     }
 149
 150     /* Buffer response code */
 151     stl_phys(&s->dma_as, s->addr + 4, (1 << 31));
 152 }
 153
 154 static uint64_t bcm2835_property_read(void *opaque, hwaddr offset,
 155                                       unsigned size)
 156 {
 157     BCM2835PropertyState *s = opaque;
 158     uint32_t res = 0;
 159
 160     switch (offset) {
 161     case MBOX_AS_DATA:
 162         res = MBOX_CHAN_PROPERTY | s->addr;
 163         s->pending = false;
 164         qemu_set_irq(s->mbox_irq, 0);
 165         break;
 166
 167     case MBOX_AS_PENDING:
 168         res = s->pending;
 169         break;
 170
 171     default:
 172         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
 173                       __func__, offset);
 174         return 0;
 175     }
 176
 177     return res;
 178 }
 179
 180 static void bcm2835_property_write(void *opaque, hwaddr offset,
 181                                    uint64_t value, unsigned size)
 182 {
 183     BCM2835PropertyState *s = opaque;
 184
 185     switch (offset) {
 186     case MBOX_AS_DATA:
 187         /* bcm2835_mbox should check our pending status before pushing */
 188         assert(!s->pending);
 189         s->pending = true;
 190         bcm2835_property_mbox_push(s, value);
 191         qemu_set_irq(s->mbox_irq, 1);
 192         break;
 193
 194     default:
 195         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
 196                       __func__, offset);
 197         return;
 198     }
 199 }
 200
 201 static const MemoryRegionOps bcm2835_property_ops = {
 202     .read = bcm2835_property_read,
 203     .write = bcm2835_property_write,
 204     .endianness = DEVICE_NATIVE_ENDIAN,
 205     .valid.min_access_size = 4,
 206     .valid.max_access_size = 4,
 207 };
 208
 209 static const VMStateDescription vmstate_bcm2835_property = {
 210     .name = TYPE_BCM2835_PROPERTY,
 211     .version_id = 1,
 212     .minimum_version_id = 1,
 213     .fields      = (VMStateField[]) {
 214         VMSTATE_MACADDR(macaddr, BCM2835PropertyState),
 215         VMSTATE_UINT32(addr, BCM2835PropertyState),
 216         VMSTATE_BOOL(pending, BCM2835PropertyState),
 217         VMSTATE_END_OF_LIST()
 218     }
 219 };
 220
 221 static void bcm2835_property_init(Object *obj)
 222 {
 223     BCM2835PropertyState *s = BCM2835_PROPERTY(obj);
 224
 225     memory_region_init_io(&s->iomem, OBJECT(s), &bcm2835_property_ops, s,
 226                           TYPE_BCM2835_PROPERTY, 0x10);
 227     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
 228     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
 229 }
 230
 231 static void bcm2835_property_reset(DeviceState *dev)
 232 {
 233     BCM2835PropertyState *s = BCM2835_PROPERTY(dev);
 234
 235     s->pending = false;
 236 }
 237
 238 static void bcm2835_property_realize(DeviceState *dev, Error **errp)
 239 {
 240     BCM2835PropertyState *s = BCM2835_PROPERTY(dev);
 241     Object *obj;
 242     Error *err = NULL;
 243
 244     obj = object_property_get_link(OBJECT(dev), "dma-mr", &err);
 245     if (obj == NULL) {
 246         error_setg(errp, "%s: required dma-mr link not found: %s",
 247                    __func__, error_get_pretty(err));
 248         return;
 249     }
 250
 251     s->dma_mr = MEMORY_REGION(obj);
 252     address_space_init(&s->dma_as, s->dma_mr, NULL);
 253
 254     /* TODO: connect to MAC address of USB NIC device, once we emulate it */
 255     qemu_macaddr_default_if_unset(&s->macaddr);
 256
 257     bcm2835_property_reset(dev);
 258 }
 259
 260 static Property bcm2835_property_props[] = {
 261     DEFINE_PROP_UINT32("ram-size", BCM2835PropertyState, ram_size, 0),
 262     DEFINE_PROP_END_OF_LIST()
 263 };
 264
 265 static void bcm2835_property_class_init(ObjectClass *klass, void *data)
 266 {
 267     DeviceClass *dc = DEVICE_CLASS(klass);
 268
 269     dc->props = bcm2835_property_props;
 270     dc->realize = bcm2835_property_realize;
 271     dc->vmsd = &vmstate_bcm2835_property;
 272 }
 273
 274 static TypeInfo bcm2835_property_info = {
 275     .name          = TYPE_BCM2835_PROPERTY,
 276     .parent        = TYPE_SYS_BUS_DEVICE,
 277     .instance_size = sizeof(BCM2835PropertyState),
 278     .class_init    = bcm2835_property_class_init,
 279     .instance_init = bcm2835_property_init,
 280 };
 281
 282 static void bcm2835_property_register_types(void)
 283 {
 284     type_register_static(&bcm2835_property_info);
 285 }
 286
 287 type_init(bcm2835_property_register_types)