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/hw.h"
  24 #include "hw/ppc/ppc.h"
  25 #include "hw/ppc/ppc4xx.h"
  26 #include "hw/pci/pci.h"
  27 #include "hw/pci/pci_host.h"
  28 #include "exec/address-spaces.h"
  29 #include "trace.h"
  30
  31 struct PCIMasterMap {
  32     uint32_t la;
  33     uint32_t ma;
  34     uint32_t pcila;
  35     uint32_t pciha;
  36 };
  37
  38 struct PCITargetMap {
  39     uint32_t ms;
  40     uint32_t la;
  41 };
  42
  43 #define PPC4xx_PCI_HOST_BRIDGE(obj) \
  44     OBJECT_CHECK(PPC4xxPCIState, (obj), TYPE_PPC4xx_PCI_HOST_BRIDGE)
  45
  46 #define PPC4xx_PCI_NR_PMMS 3
  47 #define PPC4xx_PCI_NR_PTMS 2
  48
  49 struct PPC4xxPCIState {
  50     PCIHostState parent_obj;
  51
  52     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  53     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  54     qemu_irq irq[4];
  55
  56     MemoryRegion container;
  57     MemoryRegion iomem;
  58 };
  59 typedef struct PPC4xxPCIState PPC4xxPCIState;
  60
  61 #define PCIC0_CFGADDR       0x0
  62 #define PCIC0_CFGDATA       0x4
  63
  64 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  65  * PCI accesses. */
  66 #define PCIL0_PMM0LA        0x0
  67 #define PCIL0_PMM0MA        0x4
  68 #define PCIL0_PMM0PCILA     0x8
  69 #define PCIL0_PMM0PCIHA     0xc
  70 #define PCIL0_PMM1LA        0x10
  71 #define PCIL0_PMM1MA        0x14
  72 #define PCIL0_PMM1PCILA     0x18
  73 #define PCIL0_PMM1PCIHA     0x1c
  74 #define PCIL0_PMM2LA        0x20
  75 #define PCIL0_PMM2MA        0x24
  76 #define PCIL0_PMM2PCILA     0x28
  77 #define PCIL0_PMM2PCIHA     0x2c
  78
  79 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  80  * PLB accesses. */
  81 #define PCIL0_PTM1MS        0x30
  82 #define PCIL0_PTM1LA        0x34
  83 #define PCIL0_PTM2MS        0x38
  84 #define PCIL0_PTM2LA        0x3c
  85 #define PCI_REG_BASE        0x800000
  86 #define PCI_REG_SIZE        0x40
  87
  88 #define PCI_ALL_SIZE        (PCI_REG_BASE + PCI_REG_SIZE)
  89
  90 static void ppc4xx_pci_reg_write4(void *opaque, hwaddr offset,
  91                                   uint64_t value, unsigned size)
  92 {
  93     struct PPC4xxPCIState *pci = opaque;
  94
  95     /* We ignore all target attempts at PCI configuration, effectively
  96      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
  97
  98     switch (offset) {
  99     case PCIL0_PMM0LA:
 100         pci->pmm[0].la = value;
 101         break;
 102     case PCIL0_PMM0MA:
 103         pci->pmm[0].ma = value;
 104         break;
 105     case PCIL0_PMM0PCIHA:
 106         pci->pmm[0].pciha = value;
 107         break;
 108     case PCIL0_PMM0PCILA:
 109         pci->pmm[0].pcila = value;
 110         break;
 111
 112     case PCIL0_PMM1LA:
 113         pci->pmm[1].la = value;
 114         break;
 115     case PCIL0_PMM1MA:
 116         pci->pmm[1].ma = value;
 117         break;
 118     case PCIL0_PMM1PCIHA:
 119         pci->pmm[1].pciha = value;
 120         break;
 121     case PCIL0_PMM1PCILA:
 122         pci->pmm[1].pcila = value;
 123         break;
 124
 125     case PCIL0_PMM2LA:
 126         pci->pmm[2].la = value;
 127         break;
 128     case PCIL0_PMM2MA:
 129         pci->pmm[2].ma = value;
 130         break;
 131     case PCIL0_PMM2PCIHA:
 132         pci->pmm[2].pciha = value;
 133         break;
 134     case PCIL0_PMM2PCILA:
 135         pci->pmm[2].pcila = value;
 136         break;
 137
 138     case PCIL0_PTM1MS:
 139         pci->ptm[0].ms = value;
 140         break;
 141     case PCIL0_PTM1LA:
 142         pci->ptm[0].la = value;
 143         break;
 144     case PCIL0_PTM2MS:
 145         pci->ptm[1].ms = value;
 146         break;
 147     case PCIL0_PTM2LA:
 148         pci->ptm[1].la = value;
 149         break;
 150
 151     default:
 152         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 153                (unsigned long)offset);
 154         break;
 155     }
 156 }
 157
 158 static uint64_t ppc4xx_pci_reg_read4(void *opaque, hwaddr offset,
 159                                      unsigned size)
 160 {
 161     struct PPC4xxPCIState *pci = opaque;
 162     uint32_t value;
 163
 164     switch (offset) {
 165     case PCIL0_PMM0LA:
 166         value = pci->pmm[0].la;
 167         break;
 168     case PCIL0_PMM0MA:
 169         value = pci->pmm[0].ma;
 170         break;
 171     case PCIL0_PMM0PCIHA:
 172         value = pci->pmm[0].pciha;
 173         break;
 174     case PCIL0_PMM0PCILA:
 175         value = pci->pmm[0].pcila;
 176         break;
 177
 178     case PCIL0_PMM1LA:
 179         value = pci->pmm[1].la;
 180         break;
 181     case PCIL0_PMM1MA:
 182         value = pci->pmm[1].ma;
 183         break;
 184     case PCIL0_PMM1PCIHA:
 185         value = pci->pmm[1].pciha;
 186         break;
 187     case PCIL0_PMM1PCILA:
 188         value = pci->pmm[1].pcila;
 189         break;
 190
 191     case PCIL0_PMM2LA:
 192         value = pci->pmm[2].la;
 193         break;
 194     case PCIL0_PMM2MA:
 195         value = pci->pmm[2].ma;
 196         break;
 197     case PCIL0_PMM2PCIHA:
 198         value = pci->pmm[2].pciha;
 199         break;
 200     case PCIL0_PMM2PCILA:
 201         value = pci->pmm[2].pcila;
 202         break;
 203
 204     case PCIL0_PTM1MS:
 205         value = pci->ptm[0].ms;
 206         break;
 207     case PCIL0_PTM1LA:
 208         value = pci->ptm[0].la;
 209         break;
 210     case PCIL0_PTM2MS:
 211         value = pci->ptm[1].ms;
 212         break;
 213     case PCIL0_PTM2LA:
 214         value = pci->ptm[1].la;
 215         break;
 216
 217     default:
 218         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 219                (unsigned long)offset);
 220         value = 0;
 221     }
 222
 223     return value;
 224 }
 225
 226 static const MemoryRegionOps pci_reg_ops = {
 227     .read = ppc4xx_pci_reg_read4,
 228     .write = ppc4xx_pci_reg_write4,
 229     .endianness = DEVICE_LITTLE_ENDIAN,
 230 };
 231
 232 static void ppc4xx_pci_reset(void *opaque)
 233 {
 234     struct PPC4xxPCIState *pci = opaque;
 235
 236     memset(pci->pmm, 0, sizeof(pci->pmm));
 237     memset(pci->ptm, 0, sizeof(pci->ptm));
 238 }
 239
 240 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 241  * may need further refactoring for other boards. */
 242 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 243 {
 244     int slot = pci_dev->devfn >> 3;
 245
 246     trace_ppc4xx_pci_map_irq(pci_dev->devfn, irq_num, slot);
 247
 248     return slot - 1;
 249 }
 250
 251 static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
 252 {
 253     qemu_irq *pci_irqs = opaque;
 254
 255     trace_ppc4xx_pci_set_irq(irq_num);
 256     if (irq_num < 0) {
 257         fprintf(stderr, "%s: PCI irq %d\n", __func__, irq_num);
 258         return;
 259     }
 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 int ppc4xx_pcihost_initfn(SysBusDevice *dev)
 304 {
 305     PPC4xxPCIState *s;
 306     PCIHostState *h;
 307     PCIBus *b;
 308     int i;
 309
 310     h = PCI_HOST_BRIDGE(dev);
 311     s = PPC4xx_PCI_HOST_BRIDGE(dev);
 312
 313     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
 314         sysbus_init_irq(dev, &s->irq[i]);
 315     }
 316
 317     b = pci_register_bus(DEVICE(dev), NULL, ppc4xx_pci_set_irq,
 318                          ppc4xx_pci_map_irq, s->irq, get_system_memory(),
 319                          get_system_io(), 0, 4, TYPE_PCI_BUS);
 320     h->bus = b;
 321
 322     pci_create_simple(b, 0, "ppc4xx-host-bridge");
 323
 324     /* XXX split into 2 memory regions, one for config space, one for regs */
 325     memory_region_init(&s->container, OBJECT(s), "pci-container", PCI_ALL_SIZE);
 326     memory_region_init_io(&h->conf_mem, OBJECT(s), &pci_host_conf_le_ops, h,
 327                           "pci-conf-idx", 4);
 328     memory_region_init_io(&h->data_mem, OBJECT(s), &pci_host_data_le_ops, h,
 329                           "pci-conf-data", 4);
 330     memory_region_init_io(&s->iomem, OBJECT(s), &pci_reg_ops, s,
 331                           "pci.reg", PCI_REG_SIZE);
 332     memory_region_add_subregion(&s->container, PCIC0_CFGADDR, &h->conf_mem);
 333     memory_region_add_subregion(&s->container, PCIC0_CFGDATA, &h->data_mem);
 334     memory_region_add_subregion(&s->container, PCI_REG_BASE, &s->iomem);
 335     sysbus_init_mmio(dev, &s->container);
 336     qemu_register_reset(ppc4xx_pci_reset, s);
 337
 338     return 0;
 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 };
 363
 364 static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)
 365 {
 366     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 367     DeviceClass *dc = DEVICE_CLASS(klass);
 368
 369     k->init = ppc4xx_pcihost_initfn;
 370     dc->vmsd = &vmstate_ppc4xx_pci;
 371 }
 372
 373 static const TypeInfo ppc4xx_pcihost_info = {
 374     .name          = TYPE_PPC4xx_PCI_HOST_BRIDGE,
 375     .parent        = TYPE_PCI_HOST_BRIDGE,
 376     .instance_size = sizeof(PPC4xxPCIState),
 377     .class_init    = ppc4xx_pcihost_class_init,
 378 };
 379
 380 static void ppc4xx_pci_register_types(void)
 381 {
 382     type_register_static(&ppc4xx_pcihost_info);
 383     type_register_static(&ppc4xx_host_bridge_info);
 384 }
 385
 386 type_init(ppc4xx_pci_register_types)