hw/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.h"
  23 #include "ppc.h"
  24 #include "ppc4xx.h"
  25 #include "pci.h"
  26 #include "pci_host.h"
  27 #include "exec-memory.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_NR_PMMS 3
  49 #define PPC4xx_PCI_NR_PTMS 2
  50
  51 struct PPC4xxPCIState {
  52     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  53     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  54
  55     PCIHostState pci_state;
  56     PCIDevice *pci_dev;
  57     MemoryRegion iomem_addr;
  58     MemoryRegion iomem_regs;
  59 };
  60 typedef struct PPC4xxPCIState PPC4xxPCIState;
  61
  62 #define PCIC0_CFGADDR       0x0
  63 #define PCIC0_CFGDATA       0x4
  64
  65 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  66  * PCI accesses. */
  67 #define PCIL0_PMM0LA        0x0
  68 #define PCIL0_PMM0MA        0x4
  69 #define PCIL0_PMM0PCILA     0x8
  70 #define PCIL0_PMM0PCIHA     0xc
  71 #define PCIL0_PMM1LA        0x10
  72 #define PCIL0_PMM1MA        0x14
  73 #define PCIL0_PMM1PCILA     0x18
  74 #define PCIL0_PMM1PCIHA     0x1c
  75 #define PCIL0_PMM2LA        0x20
  76 #define PCIL0_PMM2MA        0x24
  77 #define PCIL0_PMM2PCILA     0x28
  78 #define PCIL0_PMM2PCIHA     0x2c
  79
  80 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  81  * PLB accesses. */
  82 #define PCIL0_PTM1MS        0x30
  83 #define PCIL0_PTM1LA        0x34
  84 #define PCIL0_PTM2MS        0x38
  85 #define PCIL0_PTM2LA        0x3c
  86 #define PCI_REG_SIZE        0x40
  87
  88
  89 static uint64_t pci4xx_cfgaddr_read(void *opaque, target_phys_addr_t addr,
  90                                     unsigned size)
  91 {
  92     PPC4xxPCIState *ppc4xx_pci = opaque;
  93
  94     return ppc4xx_pci->pci_state.config_reg;
  95 }
  96
  97 static void pci4xx_cfgaddr_write(void *opaque, target_phys_addr_t addr,
  98                                   uint64_t value, unsigned size)
  99 {
 100     PPC4xxPCIState *ppc4xx_pci = opaque;
 101
 102     ppc4xx_pci->pci_state.config_reg = value & ~0x3;
 103 }
 104
 105 static const MemoryRegionOps pci4xx_cfgaddr_ops = {
 106     .read = pci4xx_cfgaddr_read,
 107     .write = pci4xx_cfgaddr_write,
 108     .endianness = DEVICE_LITTLE_ENDIAN,
 109 };
 110
 111 static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
 112                                   uint64_t value, unsigned size)
 113 {
 114     struct PPC4xxPCIState *pci = opaque;
 115
 116     /* We ignore all target attempts at PCI configuration, effectively
 117      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 118
 119     switch (offset) {
 120     case PCIL0_PMM0LA:
 121         pci->pmm[0].la = value;
 122         break;
 123     case PCIL0_PMM0MA:
 124         pci->pmm[0].ma = value;
 125         break;
 126     case PCIL0_PMM0PCIHA:
 127         pci->pmm[0].pciha = value;
 128         break;
 129     case PCIL0_PMM0PCILA:
 130         pci->pmm[0].pcila = value;
 131         break;
 132
 133     case PCIL0_PMM1LA:
 134         pci->pmm[1].la = value;
 135         break;
 136     case PCIL0_PMM1MA:
 137         pci->pmm[1].ma = value;
 138         break;
 139     case PCIL0_PMM1PCIHA:
 140         pci->pmm[1].pciha = value;
 141         break;
 142     case PCIL0_PMM1PCILA:
 143         pci->pmm[1].pcila = value;
 144         break;
 145
 146     case PCIL0_PMM2LA:
 147         pci->pmm[2].la = value;
 148         break;
 149     case PCIL0_PMM2MA:
 150         pci->pmm[2].ma = value;
 151         break;
 152     case PCIL0_PMM2PCIHA:
 153         pci->pmm[2].pciha = value;
 154         break;
 155     case PCIL0_PMM2PCILA:
 156         pci->pmm[2].pcila = value;
 157         break;
 158
 159     case PCIL0_PTM1MS:
 160         pci->ptm[0].ms = value;
 161         break;
 162     case PCIL0_PTM1LA:
 163         pci->ptm[0].la = value;
 164         break;
 165     case PCIL0_PTM2MS:
 166         pci->ptm[1].ms = value;
 167         break;
 168     case PCIL0_PTM2LA:
 169         pci->ptm[1].la = value;
 170         break;
 171
 172     default:
 173         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 174                (unsigned long)offset);
 175         break;
 176     }
 177 }
 178
 179 static uint64_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset,
 180                                      unsigned size)
 181 {
 182     struct PPC4xxPCIState *pci = opaque;
 183     uint32_t value;
 184
 185     switch (offset) {
 186     case PCIL0_PMM0LA:
 187         value = pci->pmm[0].la;
 188         break;
 189     case PCIL0_PMM0MA:
 190         value = pci->pmm[0].ma;
 191         break;
 192     case PCIL0_PMM0PCIHA:
 193         value = pci->pmm[0].pciha;
 194         break;
 195     case PCIL0_PMM0PCILA:
 196         value = pci->pmm[0].pcila;
 197         break;
 198
 199     case PCIL0_PMM1LA:
 200         value = pci->pmm[1].la;
 201         break;
 202     case PCIL0_PMM1MA:
 203         value = pci->pmm[1].ma;
 204         break;
 205     case PCIL0_PMM1PCIHA:
 206         value = pci->pmm[1].pciha;
 207         break;
 208     case PCIL0_PMM1PCILA:
 209         value = pci->pmm[1].pcila;
 210         break;
 211
 212     case PCIL0_PMM2LA:
 213         value = pci->pmm[2].la;
 214         break;
 215     case PCIL0_PMM2MA:
 216         value = pci->pmm[2].ma;
 217         break;
 218     case PCIL0_PMM2PCIHA:
 219         value = pci->pmm[2].pciha;
 220         break;
 221     case PCIL0_PMM2PCILA:
 222         value = pci->pmm[2].pcila;
 223         break;
 224
 225     case PCIL0_PTM1MS:
 226         value = pci->ptm[0].ms;
 227         break;
 228     case PCIL0_PTM1LA:
 229         value = pci->ptm[0].la;
 230         break;
 231     case PCIL0_PTM2MS:
 232         value = pci->ptm[1].ms;
 233         break;
 234     case PCIL0_PTM2LA:
 235         value = pci->ptm[1].la;
 236         break;
 237
 238     default:
 239         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 240                (unsigned long)offset);
 241         value = 0;
 242     }
 243
 244     return value;
 245 }
 246
 247 static const MemoryRegionOps pci_reg_ops = {
 248     .read = ppc4xx_pci_reg_read4,
 249     .write = ppc4xx_pci_reg_write4,
 250     .endianness = DEVICE_LITTLE_ENDIAN,
 251 };
 252
 253 static void ppc4xx_pci_reset(void *opaque)
 254 {
 255     struct PPC4xxPCIState *pci = opaque;
 256
 257     memset(pci->pmm, 0, sizeof(pci->pmm));
 258     memset(pci->ptm, 0, sizeof(pci->ptm));
 259 }
 260
 261 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 262  * may need further refactoring for other boards. */
 263 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 264 {
 265     int slot = pci_dev->devfn >> 3;
 266
 267     DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
 268             pci_dev->devfn, irq_num, slot);
 269
 270     return slot - 1;
 271 }
 272
 273 static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
 274 {
 275     qemu_irq *pci_irqs = opaque;
 276
 277     DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
 278     qemu_set_irq(pci_irqs[irq_num], level);
 279 }
 280
 281 static const VMStateDescription vmstate_pci_master_map = {
 282     .name = "pci_master_map",
 283     .version_id = 0,
 284     .minimum_version_id = 0,
 285     .minimum_version_id_old = 0,
 286     .fields      = (VMStateField[]) {
 287         VMSTATE_UINT32(la, struct PCIMasterMap),
 288         VMSTATE_UINT32(ma, struct PCIMasterMap),
 289         VMSTATE_UINT32(pcila, struct PCIMasterMap),
 290         VMSTATE_UINT32(pciha, struct PCIMasterMap),
 291         VMSTATE_END_OF_LIST()
 292     }
 293 };
 294
 295 static const VMStateDescription vmstate_pci_target_map = {
 296     .name = "pci_target_map",
 297     .version_id = 0,
 298     .minimum_version_id = 0,
 299     .minimum_version_id_old = 0,
 300     .fields      = (VMStateField[]) {
 301         VMSTATE_UINT32(ms, struct PCITargetMap),
 302         VMSTATE_UINT32(la, struct PCITargetMap),
 303         VMSTATE_END_OF_LIST()
 304     }
 305 };
 306
 307 static const VMStateDescription vmstate_ppc4xx_pci = {
 308     .name = "ppc4xx_pci",
 309     .version_id = 1,
 310     .minimum_version_id = 1,
 311     .minimum_version_id_old = 1,
 312     .fields      = (VMStateField[]) {
 313         VMSTATE_PCI_DEVICE_POINTER(pci_dev, PPC4xxPCIState),
 314         VMSTATE_STRUCT_ARRAY(pmm, PPC4xxPCIState, PPC4xx_PCI_NR_PMMS, 1,
 315                              vmstate_pci_master_map,
 316                              struct PCIMasterMap),
 317         VMSTATE_STRUCT_ARRAY(ptm, PPC4xxPCIState, PPC4xx_PCI_NR_PTMS, 1,
 318                              vmstate_pci_target_map,
 319                              struct PCITargetMap),
 320         VMSTATE_END_OF_LIST()
 321     }
 322 };
 323
 324 /* XXX Interrupt acknowledge cycles not supported. */
 325 PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
 326                         target_phys_addr_t config_space,
 327                         target_phys_addr_t int_ack,
 328                         target_phys_addr_t special_cycle,
 329                         target_phys_addr_t registers)
 330 {
 331     PPC4xxPCIState *controller;
 332     static int ppc4xx_pci_id;
 333     uint8_t *pci_conf;
 334
 335     controller = g_malloc0(sizeof(PPC4xxPCIState));
 336
 337     controller->pci_state.bus = pci_register_bus(NULL, "pci",
 338                                                  ppc4xx_pci_set_irq,
 339                                                  ppc4xx_pci_map_irq,
 340                                                  pci_irqs,
 341                                                  get_system_memory(),
 342                                                  get_system_io(),
 343                                                  0, 4);
 344
 345     controller->pci_dev = pci_register_device(controller->pci_state.bus,
 346                                               "host bridge", sizeof(PCIDevice),
 347                                               0, NULL, NULL);
 348     pci_conf = controller->pci_dev->config;
 349     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_IBM);
 350     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_IBM_440GX);
 351     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);
 352
 353     /* CFGADDR */
 354     memory_region_init_io(&controller->iomem_addr, &pci4xx_cfgaddr_ops,
 355                           controller, "pci.cfgaddr", 4);
 356     memory_region_add_subregion(get_system_memory(),
 357                                 config_space + PCIC0_CFGADDR,
 358                                 &controller->iomem_addr);
 359
 360     /* CFGDATA */
 361     memory_region_init_io(&controller->pci_state.data_mem,
 362                           &pci_host_data_be_ops,
 363                           &controller->pci_state, "pci-conf-data", 4);
 364     memory_region_add_subregion(get_system_memory(),
 365                                 config_space + PCIC0_CFGDATA,
 366                                 &controller->pci_state.data_mem);
 367
 368     /* Internal registers */
 369     memory_region_init_io(&controller->iomem_regs, &pci_reg_ops, controller,
 370                           "pci.regs", PCI_REG_SIZE);
 371     memory_region_add_subregion(get_system_memory(), registers,
 372                                 &controller->iomem_regs);
 373
 374     qemu_register_reset(ppc4xx_pci_reset, controller);
 375
 376     /* XXX load/save code not tested. */
 377     vmstate_register(&controller->pci_dev->qdev, ppc4xx_pci_id++,
 378                      &vmstate_ppc4xx_pci, controller);
 379
 380     return controller->pci_state.bus;
 381 }