hw/ppc/ppc4xx_pci.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  13  *
  14  * Copyright IBM Corp. 2008
  15  *
  16  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  17  */
  18
  19 /* This file implements emulation of the 32-bit PCI controller found in some
  20  * 4xx SoCs, such as the 440EP. */
  21
  22 #include "qemu/osdep.h"
  23 #include "hw/irq.h"
  24 #include "hw/ppc/ppc.h"
  25 #include "hw/ppc/ppc4xx.h"
  26 #include "migration/vmstate.h"
  27 #include "qemu/module.h"
  28 #include "sysemu/reset.h"
  29 #include "hw/pci/pci.h"
  30 #include "hw/pci/pci_host.h"
  31 #include "exec/address-spaces.h"
  32 #include "trace.h"
  33
  34 struct PCIMasterMap {
  35     uint32_t la;
  36     uint32_t ma;
  37     uint32_t pcila;
  38     uint32_t pciha;
  39 };
  40
  41 struct PCITargetMap {
  42     uint32_t ms;
  43     uint32_t la;
  44 };
  45
  46 #define PPC4xx_PCI_HOST_BRIDGE(obj) \
  47     OBJECT_CHECK(PPC4xxPCIState, (obj), TYPE_PPC4xx_PCI_HOST_BRIDGE)
  48
  49 #define PPC4xx_PCI_NR_PMMS 3
  50 #define PPC4xx_PCI_NR_PTMS 2
  51
  52 struct PPC4xxPCIState {
  53     PCIHostState parent_obj;
  54
  55     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  56     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  57     qemu_irq irq[4];
  58
  59     MemoryRegion container;
  60     MemoryRegion iomem;
  61 };
  62 typedef struct PPC4xxPCIState PPC4xxPCIState;
  63
  64 #define PCIC0_CFGADDR       0x0
  65 #define PCIC0_CFGDATA       0x4
  66
  67 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  68  * PCI accesses. */
  69 #define PCIL0_PMM0LA        0x0
  70 #define PCIL0_PMM0MA        0x4
  71 #define PCIL0_PMM0PCILA     0x8
  72 #define PCIL0_PMM0PCIHA     0xc
  73 #define PCIL0_PMM1LA        0x10
  74 #define PCIL0_PMM1MA        0x14
  75 #define PCIL0_PMM1PCILA     0x18
  76 #define PCIL0_PMM1PCIHA     0x1c
  77 #define PCIL0_PMM2LA        0x20
  78 #define PCIL0_PMM2MA        0x24
  79 #define PCIL0_PMM2PCILA     0x28
  80 #define PCIL0_PMM2PCIHA     0x2c
  81
  82 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  83  * PLB accesses. */
  84 #define PCIL0_PTM1MS        0x30
  85 #define PCIL0_PTM1LA        0x34
  86 #define PCIL0_PTM2MS        0x38
  87 #define PCIL0_PTM2LA        0x3c
  88 #define PCI_REG_BASE        0x800000
  89 #define PCI_REG_SIZE        0x40
  90
  91 #define PCI_ALL_SIZE        (PCI_REG_BASE + PCI_REG_SIZE)
  92
  93 static void ppc4xx_pci_reg_write4(void *opaque, hwaddr offset,
  94                                   uint64_t value, unsigned size)
  95 {
  96     struct PPC4xxPCIState *pci = opaque;
  97
  98     /* We ignore all target attempts at PCI configuration, effectively
  99      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 100
 101     switch (offset) {
 102     case PCIL0_PMM0LA:
 103         pci->pmm[0].la = value;
 104         break;
 105     case PCIL0_PMM0MA:
 106         pci->pmm[0].ma = value;
 107         break;
 108     case PCIL0_PMM0PCIHA:
 109         pci->pmm[0].pciha = value;
 110         break;
 111     case PCIL0_PMM0PCILA:
 112         pci->pmm[0].pcila = value;
 113         break;
 114
 115     case PCIL0_PMM1LA:
 116         pci->pmm[1].la = value;
 117         break;
 118     case PCIL0_PMM1MA:
 119         pci->pmm[1].ma = value;
 120         break;
 121     case PCIL0_PMM1PCIHA:
 122         pci->pmm[1].pciha = value;
 123         break;
 124     case PCIL0_PMM1PCILA:
 125         pci->pmm[1].pcila = value;
 126         break;
 127
 128     case PCIL0_PMM2LA:
 129         pci->pmm[2].la = value;
 130         break;
 131     case PCIL0_PMM2MA:
 132         pci->pmm[2].ma = value;
 133         break;
 134     case PCIL0_PMM2PCIHA:
 135         pci->pmm[2].pciha = value;
 136         break;
 137     case PCIL0_PMM2PCILA:
 138         pci->pmm[2].pcila = value;
 139         break;
 140
 141     case PCIL0_PTM1MS:
 142         pci->ptm[0].ms = value;
 143         break;
 144     case PCIL0_PTM1LA:
 145         pci->ptm[0].la = value;
 146         break;
 147     case PCIL0_PTM2MS:
 148         pci->ptm[1].ms = value;
 149         break;
 150     case PCIL0_PTM2LA:
 151         pci->ptm[1].la = value;
 152         break;
 153
 154     default:
 155         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 156                (unsigned long)offset);
 157         break;
 158     }
 159 }
 160
 161 static uint64_t ppc4xx_pci_reg_read4(void *opaque, hwaddr offset,
 162                                      unsigned size)
 163 {
 164     struct PPC4xxPCIState *pci = opaque;
 165     uint32_t value;
 166
 167     switch (offset) {
 168     case PCIL0_PMM0LA:
 169         value = pci->pmm[0].la;
 170         break;
 171     case PCIL0_PMM0MA:
 172         value = pci->pmm[0].ma;
 173         break;
 174     case PCIL0_PMM0PCIHA:
 175         value = pci->pmm[0].pciha;
 176         break;
 177     case PCIL0_PMM0PCILA:
 178         value = pci->pmm[0].pcila;
 179         break;
 180
 181     case PCIL0_PMM1LA:
 182         value = pci->pmm[1].la;
 183         break;
 184     case PCIL0_PMM1MA:
 185         value = pci->pmm[1].ma;
 186         break;
 187     case PCIL0_PMM1PCIHA:
 188         value = pci->pmm[1].pciha;
 189         break;
 190     case PCIL0_PMM1PCILA:
 191         value = pci->pmm[1].pcila;
 192         break;
 193
 194     case PCIL0_PMM2LA:
 195         value = pci->pmm[2].la;
 196         break;
 197     case PCIL0_PMM2MA:
 198         value = pci->pmm[2].ma;
 199         break;
 200     case PCIL0_PMM2PCIHA:
 201         value = pci->pmm[2].pciha;
 202         break;
 203     case PCIL0_PMM2PCILA:
 204         value = pci->pmm[2].pcila;
 205         break;
 206
 207     case PCIL0_PTM1MS:
 208         value = pci->ptm[0].ms;
 209         break;
 210     case PCIL0_PTM1LA:
 211         value = pci->ptm[0].la;
 212         break;
 213     case PCIL0_PTM2MS:
 214         value = pci->ptm[1].ms;
 215         break;
 216     case PCIL0_PTM2LA:
 217         value = pci->ptm[1].la;
 218         break;
 219
 220     default:
 221         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 222                (unsigned long)offset);
 223         value = 0;
 224     }
 225
 226     return value;
 227 }
 228
 229 static const MemoryRegionOps pci_reg_ops = {
 230     .read = ppc4xx_pci_reg_read4,
 231     .write = ppc4xx_pci_reg_write4,
 232     .endianness = DEVICE_LITTLE_ENDIAN,
 233 };
 234
 235 static void ppc4xx_pci_reset(void *opaque)
 236 {
 237     struct PPC4xxPCIState *pci = opaque;
 238
 239     memset(pci->pmm, 0, sizeof(pci->pmm));
 240     memset(pci->ptm, 0, sizeof(pci->ptm));
 241 }
 242
 243 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 244  * may need further refactoring for other boards. */
 245 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 246 {
 247     int slot = pci_dev->devfn >> 3;
 248
 249     trace_ppc4xx_pci_map_irq(pci_dev->devfn, irq_num, slot);
 250
 251     return slot - 1;
 252 }
 253
 254 static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
 255 {
 256     qemu_irq *pci_irqs = opaque;
 257
 258     trace_ppc4xx_pci_set_irq(irq_num);
 259     assert(irq_num >= 0);
 260     qemu_set_irq(pci_irqs[irq_num], level);
 261 }
 262
 263 static const VMStateDescription vmstate_pci_master_map = {
 264     .name = "pci_master_map",
 265     .version_id = 0,
 266     .minimum_version_id = 0,
 267     .fields = (VMStateField[]) {
 268         VMSTATE_UINT32(la, struct PCIMasterMap),
 269         VMSTATE_UINT32(ma, struct PCIMasterMap),
 270         VMSTATE_UINT32(pcila, struct PCIMasterMap),
 271         VMSTATE_UINT32(pciha, struct PCIMasterMap),
 272         VMSTATE_END_OF_LIST()
 273     }
 274 };
 275
 276 static const VMStateDescription vmstate_pci_target_map = {
 277     .name = "pci_target_map",
 278     .version_id = 0,
 279     .minimum_version_id = 0,
 280     .fields = (VMStateField[]) {
 281         VMSTATE_UINT32(ms, struct PCITargetMap),
 282         VMSTATE_UINT32(la, struct PCITargetMap),
 283         VMSTATE_END_OF_LIST()
 284     }
 285 };
 286
 287 static const VMStateDescription vmstate_ppc4xx_pci = {
 288     .name = "ppc4xx_pci",
 289     .version_id = 1,
 290     .minimum_version_id = 1,
 291     .fields = (VMStateField[]) {
 292         VMSTATE_STRUCT_ARRAY(pmm, PPC4xxPCIState, PPC4xx_PCI_NR_PMMS, 1,
 293                              vmstate_pci_master_map,
 294                              struct PCIMasterMap),
 295         VMSTATE_STRUCT_ARRAY(ptm, PPC4xxPCIState, PPC4xx_PCI_NR_PTMS, 1,
 296                              vmstate_pci_target_map,
 297                              struct PCITargetMap),
 298         VMSTATE_END_OF_LIST()
 299     }
 300 };
 301
 302 /* XXX Interrupt acknowledge cycles not supported. */
 303 static void ppc4xx_pcihost_realize(DeviceState *dev, Error **errp)
 304 {
 305     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 306     PPC4xxPCIState *s;
 307     PCIHostState *h;
 308     PCIBus *b;
 309     int i;
 310
 311     h = PCI_HOST_BRIDGE(dev);
 312     s = PPC4xx_PCI_HOST_BRIDGE(dev);
 313
 314     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
 315         sysbus_init_irq(sbd, &s->irq[i]);
 316     }
 317
 318     b = pci_register_root_bus(dev, NULL, ppc4xx_pci_set_irq,
 319                               ppc4xx_pci_map_irq, s->irq, get_system_memory(),
 320                               get_system_io(), 0, ARRAY_SIZE(s->irq),
 321                               TYPE_PCI_BUS);
 322     h->bus = b;
 323
 324     pci_create_simple(b, 0, "ppc4xx-host-bridge");
 325
 326     /* XXX split into 2 memory regions, one for config space, one for regs */
 327     memory_region_init(&s->container, OBJECT(s), "pci-container", PCI_ALL_SIZE);
 328     memory_region_init_io(&h->conf_mem, OBJECT(s), &pci_host_conf_le_ops, h,
 329                           "pci-conf-idx", 4);
 330     memory_region_init_io(&h->data_mem, OBJECT(s), &pci_host_data_le_ops, h,
 331                           "pci-conf-data", 4);
 332     memory_region_init_io(&s->iomem, OBJECT(s), &pci_reg_ops, s,
 333                           "pci.reg", PCI_REG_SIZE);
 334     memory_region_add_subregion(&s->container, PCIC0_CFGADDR, &h->conf_mem);
 335     memory_region_add_subregion(&s->container, PCIC0_CFGDATA, &h->data_mem);
 336     memory_region_add_subregion(&s->container, PCI_REG_BASE, &s->iomem);
 337     sysbus_init_mmio(sbd, &s->container);
 338     qemu_register_reset(ppc4xx_pci_reset, s);
 339 }
 340
 341 static void ppc4xx_host_bridge_class_init(ObjectClass *klass, void *data)
 342 {
 343     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 344     DeviceClass *dc = DEVICE_CLASS(klass);
 345
 346     dc->desc        = "Host bridge";
 347     k->vendor_id    = PCI_VENDOR_ID_IBM;
 348     k->device_id    = PCI_DEVICE_ID_IBM_440GX;
 349     k->class_id     = PCI_CLASS_BRIDGE_OTHER;
 350     /*
 351      * PCI-facing part of the host bridge, not usable without the
 352      * host-facing part, which can't be device_add'ed, yet.
 353      */
 354     dc->user_creatable = false;
 355 }
 356
 357 static const TypeInfo ppc4xx_host_bridge_info = {
 358     .name          = "ppc4xx-host-bridge",
 359     .parent        = TYPE_PCI_DEVICE,
 360     .instance_size = sizeof(PCIDevice),
 361     .class_init    = ppc4xx_host_bridge_class_init,
 362     .interfaces = (InterfaceInfo[]) {
 363         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 364         { },
 365     },
 366 };
 367
 368 static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)
 369 {
 370     DeviceClass *dc = DEVICE_CLASS(klass);
 371
 372     dc->realize = ppc4xx_pcihost_realize;
 373     dc->vmsd = &vmstate_ppc4xx_pci;
 374 }
 375
 376 static const TypeInfo ppc4xx_pcihost_info = {
 377     .name          = TYPE_PPC4xx_PCI_HOST_BRIDGE,
 378     .parent        = TYPE_PCI_HOST_BRIDGE,
 379     .instance_size = sizeof(PPC4xxPCIState),
 380     .class_init    = ppc4xx_pcihost_class_init,
 381 };
 382
 383 static void ppc4xx_pci_register_types(void)
 384 {
 385     type_register_static(&ppc4xx_pcihost_info);
 386     type_register_static(&ppc4xx_host_bridge_info);
 387 }
 388
 389 type_init(ppc4xx_pci_register_types)