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 "hw/hw.h"
  23 #include "hw/ppc/ppc.h"
  24 #include "hw/ppc/ppc4xx.h"
  25 #include "hw/pci/pci.h"
  26 #include "hw/pci/pci_host.h"
  27 #include "exec/address-spaces.h"
  28
  29 #undef DEBUG
  30 #ifdef DEBUG
  31 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  32 #else
  33 #define DPRINTF(fmt, ...)
  34 #endif /* DEBUG */
  35
  36 struct PCIMasterMap {
  37     uint32_t la;
  38     uint32_t ma;
  39     uint32_t pcila;
  40     uint32_t pciha;
  41 };
  42
  43 struct PCITargetMap {
  44     uint32_t ms;
  45     uint32_t la;
  46 };
  47
  48 #define PPC4xx_PCI_HOST_BRIDGE(obj) \
  49     OBJECT_CHECK(PPC4xxPCIState, (obj), TYPE_PPC4xx_PCI_HOST_BRIDGE)
  50
  51 #define PPC4xx_PCI_NR_PMMS 3
  52 #define PPC4xx_PCI_NR_PTMS 2
  53
  54 struct PPC4xxPCIState {
  55     PCIHostState parent_obj;
  56
  57     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  58     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  59     qemu_irq irq[4];
  60
  61     MemoryRegion container;
  62     MemoryRegion iomem;
  63 };
  64 typedef struct PPC4xxPCIState PPC4xxPCIState;
  65
  66 #define PCIC0_CFGADDR       0x0
  67 #define PCIC0_CFGDATA       0x4
  68
  69 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  70  * PCI accesses. */
  71 #define PCIL0_PMM0LA        0x0
  72 #define PCIL0_PMM0MA        0x4
  73 #define PCIL0_PMM0PCILA     0x8
  74 #define PCIL0_PMM0PCIHA     0xc
  75 #define PCIL0_PMM1LA        0x10
  76 #define PCIL0_PMM1MA        0x14
  77 #define PCIL0_PMM1PCILA     0x18
  78 #define PCIL0_PMM1PCIHA     0x1c
  79 #define PCIL0_PMM2LA        0x20
  80 #define PCIL0_PMM2MA        0x24
  81 #define PCIL0_PMM2PCILA     0x28
  82 #define PCIL0_PMM2PCIHA     0x2c
  83
  84 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  85  * PLB accesses. */
  86 #define PCIL0_PTM1MS        0x30
  87 #define PCIL0_PTM1LA        0x34
  88 #define PCIL0_PTM2MS        0x38
  89 #define PCIL0_PTM2LA        0x3c
  90 #define PCI_REG_BASE        0x800000
  91 #define PCI_REG_SIZE        0x40
  92
  93 #define PCI_ALL_SIZE        (PCI_REG_BASE + PCI_REG_SIZE)
  94
  95 static uint64_t pci4xx_cfgaddr_read(void *opaque, hwaddr addr,
  96                                     unsigned size)
  97 {
  98     PPC4xxPCIState *ppc4xx_pci = opaque;
  99     PCIHostState *phb = PCI_HOST_BRIDGE(ppc4xx_pci);
 100
 101     return phb->config_reg;
 102 }
 103
 104 static void pci4xx_cfgaddr_write(void *opaque, hwaddr addr,
 105                                   uint64_t value, unsigned size)
 106 {
 107     PPC4xxPCIState *ppc4xx_pci = opaque;
 108     PCIHostState *phb = PCI_HOST_BRIDGE(ppc4xx_pci);
 109
 110     phb->config_reg = value & ~0x3;
 111 }
 112
 113 static const MemoryRegionOps pci4xx_cfgaddr_ops = {
 114     .read = pci4xx_cfgaddr_read,
 115     .write = pci4xx_cfgaddr_write,
 116     .endianness = DEVICE_LITTLE_ENDIAN,
 117 };
 118
 119 static void ppc4xx_pci_reg_write4(void *opaque, hwaddr offset,
 120                                   uint64_t value, unsigned size)
 121 {
 122     struct PPC4xxPCIState *pci = opaque;
 123
 124     /* We ignore all target attempts at PCI configuration, effectively
 125      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 126
 127     switch (offset) {
 128     case PCIL0_PMM0LA:
 129         pci->pmm[0].la = value;
 130         break;
 131     case PCIL0_PMM0MA:
 132         pci->pmm[0].ma = value;
 133         break;
 134     case PCIL0_PMM0PCIHA:
 135         pci->pmm[0].pciha = value;
 136         break;
 137     case PCIL0_PMM0PCILA:
 138         pci->pmm[0].pcila = value;
 139         break;
 140
 141     case PCIL0_PMM1LA:
 142         pci->pmm[1].la = value;
 143         break;
 144     case PCIL0_PMM1MA:
 145         pci->pmm[1].ma = value;
 146         break;
 147     case PCIL0_PMM1PCIHA:
 148         pci->pmm[1].pciha = value;
 149         break;
 150     case PCIL0_PMM1PCILA:
 151         pci->pmm[1].pcila = value;
 152         break;
 153
 154     case PCIL0_PMM2LA:
 155         pci->pmm[2].la = value;
 156         break;
 157     case PCIL0_PMM2MA:
 158         pci->pmm[2].ma = value;
 159         break;
 160     case PCIL0_PMM2PCIHA:
 161         pci->pmm[2].pciha = value;
 162         break;
 163     case PCIL0_PMM2PCILA:
 164         pci->pmm[2].pcila = value;
 165         break;
 166
 167     case PCIL0_PTM1MS:
 168         pci->ptm[0].ms = value;
 169         break;
 170     case PCIL0_PTM1LA:
 171         pci->ptm[0].la = value;
 172         break;
 173     case PCIL0_PTM2MS:
 174         pci->ptm[1].ms = value;
 175         break;
 176     case PCIL0_PTM2LA:
 177         pci->ptm[1].la = value;
 178         break;
 179
 180     default:
 181         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 182                (unsigned long)offset);
 183         break;
 184     }
 185 }
 186
 187 static uint64_t ppc4xx_pci_reg_read4(void *opaque, hwaddr offset,
 188                                      unsigned size)
 189 {
 190     struct PPC4xxPCIState *pci = opaque;
 191     uint32_t value;
 192
 193     switch (offset) {
 194     case PCIL0_PMM0LA:
 195         value = pci->pmm[0].la;
 196         break;
 197     case PCIL0_PMM0MA:
 198         value = pci->pmm[0].ma;
 199         break;
 200     case PCIL0_PMM0PCIHA:
 201         value = pci->pmm[0].pciha;
 202         break;
 203     case PCIL0_PMM0PCILA:
 204         value = pci->pmm[0].pcila;
 205         break;
 206
 207     case PCIL0_PMM1LA:
 208         value = pci->pmm[1].la;
 209         break;
 210     case PCIL0_PMM1MA:
 211         value = pci->pmm[1].ma;
 212         break;
 213     case PCIL0_PMM1PCIHA:
 214         value = pci->pmm[1].pciha;
 215         break;
 216     case PCIL0_PMM1PCILA:
 217         value = pci->pmm[1].pcila;
 218         break;
 219
 220     case PCIL0_PMM2LA:
 221         value = pci->pmm[2].la;
 222         break;
 223     case PCIL0_PMM2MA:
 224         value = pci->pmm[2].ma;
 225         break;
 226     case PCIL0_PMM2PCIHA:
 227         value = pci->pmm[2].pciha;
 228         break;
 229     case PCIL0_PMM2PCILA:
 230         value = pci->pmm[2].pcila;
 231         break;
 232
 233     case PCIL0_PTM1MS:
 234         value = pci->ptm[0].ms;
 235         break;
 236     case PCIL0_PTM1LA:
 237         value = pci->ptm[0].la;
 238         break;
 239     case PCIL0_PTM2MS:
 240         value = pci->ptm[1].ms;
 241         break;
 242     case PCIL0_PTM2LA:
 243         value = pci->ptm[1].la;
 244         break;
 245
 246     default:
 247         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 248                (unsigned long)offset);
 249         value = 0;
 250     }
 251
 252     return value;
 253 }
 254
 255 static const MemoryRegionOps pci_reg_ops = {
 256     .read = ppc4xx_pci_reg_read4,
 257     .write = ppc4xx_pci_reg_write4,
 258     .endianness = DEVICE_LITTLE_ENDIAN,
 259 };
 260
 261 static void ppc4xx_pci_reset(void *opaque)
 262 {
 263     struct PPC4xxPCIState *pci = opaque;
 264
 265     memset(pci->pmm, 0, sizeof(pci->pmm));
 266     memset(pci->ptm, 0, sizeof(pci->ptm));
 267 }
 268
 269 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 270  * may need further refactoring for other boards. */
 271 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 272 {
 273     int slot = pci_dev->devfn >> 3;
 274
 275     DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
 276             pci_dev->devfn, irq_num, slot);
 277
 278     return slot - 1;
 279 }
 280
 281 static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
 282 {
 283     qemu_irq *pci_irqs = opaque;
 284
 285     DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
 286     if (irq_num < 0) {
 287         fprintf(stderr, "%s: PCI irq %d\n", __func__, irq_num);
 288         return;
 289     }
 290     qemu_set_irq(pci_irqs[irq_num], level);
 291 }
 292
 293 static const VMStateDescription vmstate_pci_master_map = {
 294     .name = "pci_master_map",
 295     .version_id = 0,
 296     .minimum_version_id = 0,
 297     .fields = (VMStateField[]) {
 298         VMSTATE_UINT32(la, struct PCIMasterMap),
 299         VMSTATE_UINT32(ma, struct PCIMasterMap),
 300         VMSTATE_UINT32(pcila, struct PCIMasterMap),
 301         VMSTATE_UINT32(pciha, struct PCIMasterMap),
 302         VMSTATE_END_OF_LIST()
 303     }
 304 };
 305
 306 static const VMStateDescription vmstate_pci_target_map = {
 307     .name = "pci_target_map",
 308     .version_id = 0,
 309     .minimum_version_id = 0,
 310     .fields = (VMStateField[]) {
 311         VMSTATE_UINT32(ms, struct PCITargetMap),
 312         VMSTATE_UINT32(la, struct PCITargetMap),
 313         VMSTATE_END_OF_LIST()
 314     }
 315 };
 316
 317 static const VMStateDescription vmstate_ppc4xx_pci = {
 318     .name = "ppc4xx_pci",
 319     .version_id = 1,
 320     .minimum_version_id = 1,
 321     .fields = (VMStateField[]) {
 322         VMSTATE_STRUCT_ARRAY(pmm, PPC4xxPCIState, PPC4xx_PCI_NR_PMMS, 1,
 323                              vmstate_pci_master_map,
 324                              struct PCIMasterMap),
 325         VMSTATE_STRUCT_ARRAY(ptm, PPC4xxPCIState, PPC4xx_PCI_NR_PTMS, 1,
 326                              vmstate_pci_target_map,
 327                              struct PCITargetMap),
 328         VMSTATE_END_OF_LIST()
 329     }
 330 };
 331
 332 /* XXX Interrupt acknowledge cycles not supported. */
 333 static int ppc4xx_pcihost_initfn(SysBusDevice *dev)
 334 {
 335     PPC4xxPCIState *s;
 336     PCIHostState *h;
 337     PCIBus *b;
 338     int i;
 339
 340     h = PCI_HOST_BRIDGE(dev);
 341     s = PPC4xx_PCI_HOST_BRIDGE(dev);
 342
 343     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
 344         sysbus_init_irq(dev, &s->irq[i]);
 345     }
 346
 347     b = pci_register_bus(DEVICE(dev), NULL, ppc4xx_pci_set_irq,
 348                          ppc4xx_pci_map_irq, s->irq, get_system_memory(),
 349                          get_system_io(), 0, 4, TYPE_PCI_BUS);
 350     h->bus = b;
 351
 352     pci_create_simple(b, 0, "ppc4xx-host-bridge");
 353
 354     /* XXX split into 2 memory regions, one for config space, one for regs */
 355     memory_region_init(&s->container, OBJECT(s), "pci-container", PCI_ALL_SIZE);
 356     memory_region_init_io(&h->conf_mem, OBJECT(s), &pci_host_conf_le_ops, h,
 357                           "pci-conf-idx", 4);
 358     memory_region_init_io(&h->data_mem, OBJECT(s), &pci_host_data_le_ops, h,
 359                           "pci-conf-data", 4);
 360     memory_region_init_io(&s->iomem, OBJECT(s), &pci_reg_ops, s,
 361                           "pci.reg", PCI_REG_SIZE);
 362     memory_region_add_subregion(&s->container, PCIC0_CFGADDR, &h->conf_mem);
 363     memory_region_add_subregion(&s->container, PCIC0_CFGDATA, &h->data_mem);
 364     memory_region_add_subregion(&s->container, PCI_REG_BASE, &s->iomem);
 365     sysbus_init_mmio(dev, &s->container);
 366     qemu_register_reset(ppc4xx_pci_reset, s);
 367
 368     return 0;
 369 }
 370
 371 static void ppc4xx_host_bridge_class_init(ObjectClass *klass, void *data)
 372 {
 373     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 374     DeviceClass *dc = DEVICE_CLASS(klass);
 375
 376     dc->desc        = "Host bridge";
 377     k->vendor_id    = PCI_VENDOR_ID_IBM;
 378     k->device_id    = PCI_DEVICE_ID_IBM_440GX;
 379     k->class_id     = PCI_CLASS_BRIDGE_OTHER;
 380     /*
 381      * PCI-facing part of the host bridge, not usable without the
 382      * host-facing part, which can't be device_add'ed, yet.
 383      */
 384     dc->cannot_instantiate_with_device_add_yet = true;
 385 }
 386
 387 static const TypeInfo ppc4xx_host_bridge_info = {
 388     .name          = "ppc4xx-host-bridge",
 389     .parent        = TYPE_PCI_DEVICE,
 390     .instance_size = sizeof(PCIDevice),
 391     .class_init    = ppc4xx_host_bridge_class_init,
 392 };
 393
 394 static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)
 395 {
 396     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 397     DeviceClass *dc = DEVICE_CLASS(klass);
 398
 399     k->init = ppc4xx_pcihost_initfn;
 400     dc->vmsd = &vmstate_ppc4xx_pci;
 401 }
 402
 403 static const TypeInfo ppc4xx_pcihost_info = {
 404     .name          = TYPE_PPC4xx_PCI_HOST_BRIDGE,
 405     .parent        = TYPE_PCI_HOST_BRIDGE,
 406     .instance_size = sizeof(PPC4xxPCIState),
 407     .class_init    = ppc4xx_pcihost_class_init,
 408 };
 409
 410 static void ppc4xx_pci_register_types(void)
 411 {
 412     type_register_static(&ppc4xx_pcihost_info);
 413     type_register_static(&ppc4xx_host_bridge_info);
 414 }
 415
 416 type_init(ppc4xx_pci_register_types)