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
  26 typedef target_phys_addr_t pci_addr_t;
  27 #include "pci.h"
  28 #include "pci_host.h"
  29 #include "bswap.h"
  30
  31 #undef DEBUG
  32 #ifdef DEBUG
  33 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  34 #else
  35 #define DPRINTF(fmt, ...)
  36 #endif /* DEBUG */
  37
  38 struct PCIMasterMap {
  39     uint32_t la;
  40     uint32_t ma;
  41     uint32_t pcila;
  42     uint32_t pciha;
  43 };
  44
  45 struct PCITargetMap {
  46     uint32_t ms;
  47     uint32_t la;
  48 };
  49
  50 #define PPC4xx_PCI_NR_PMMS 3
  51 #define PPC4xx_PCI_NR_PTMS 2
  52
  53 struct PPC4xxPCIState {
  54     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  55     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  56
  57     PCIHostState pci_state;
  58     PCIDevice *pci_dev;
  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 uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
  90 {
  91     PPC4xxPCIState *ppc4xx_pci = opaque;
  92
  93     return ppc4xx_pci->pci_state.config_reg;
  94 }
  95
  96 static CPUReadMemoryFunc * const pci4xx_cfgaddr_read[] = {
  97     &pci4xx_cfgaddr_readl,
  98     &pci4xx_cfgaddr_readl,
  99     &pci4xx_cfgaddr_readl,
 100 };
 101
 102 static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
 103                                   uint32_t value)
 104 {
 105     PPC4xxPCIState *ppc4xx_pci = opaque;
 106
 107 #ifdef TARGET_WORDS_BIGENDIAN
 108     value = bswap32(value);
 109 #endif
 110
 111     ppc4xx_pci->pci_state.config_reg = value & ~0x3;
 112 }
 113
 114 static CPUWriteMemoryFunc * const pci4xx_cfgaddr_write[] = {
 115     &pci4xx_cfgaddr_writel,
 116     &pci4xx_cfgaddr_writel,
 117     &pci4xx_cfgaddr_writel,
 118 };
 119
 120 static CPUReadMemoryFunc * const pci4xx_cfgdata_read[] = {
 121     &pci_host_data_readb,
 122     &pci_host_data_readw,
 123     &pci_host_data_readl,
 124 };
 125
 126 static CPUWriteMemoryFunc * const pci4xx_cfgdata_write[] = {
 127     &pci_host_data_writeb,
 128     &pci_host_data_writew,
 129     &pci_host_data_writel,
 130 };
 131
 132 static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
 133                                   uint32_t value)
 134 {
 135     struct PPC4xxPCIState *pci = opaque;
 136
 137 #ifdef TARGET_WORDS_BIGENDIAN
 138     value = bswap32(value);
 139 #endif
 140
 141     /* We ignore all target attempts at PCI configuration, effectively
 142      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 143
 144     switch (offset) {
 145     case PCIL0_PMM0LA:
 146         pci->pmm[0].la = value;
 147         break;
 148     case PCIL0_PMM0MA:
 149         pci->pmm[0].ma = value;
 150         break;
 151     case PCIL0_PMM0PCIHA:
 152         pci->pmm[0].pciha = value;
 153         break;
 154     case PCIL0_PMM0PCILA:
 155         pci->pmm[0].pcila = value;
 156         break;
 157
 158     case PCIL0_PMM1LA:
 159         pci->pmm[1].la = value;
 160         break;
 161     case PCIL0_PMM1MA:
 162         pci->pmm[1].ma = value;
 163         break;
 164     case PCIL0_PMM1PCIHA:
 165         pci->pmm[1].pciha = value;
 166         break;
 167     case PCIL0_PMM1PCILA:
 168         pci->pmm[1].pcila = value;
 169         break;
 170
 171     case PCIL0_PMM2LA:
 172         pci->pmm[2].la = value;
 173         break;
 174     case PCIL0_PMM2MA:
 175         pci->pmm[2].ma = value;
 176         break;
 177     case PCIL0_PMM2PCIHA:
 178         pci->pmm[2].pciha = value;
 179         break;
 180     case PCIL0_PMM2PCILA:
 181         pci->pmm[2].pcila = value;
 182         break;
 183
 184     case PCIL0_PTM1MS:
 185         pci->ptm[0].ms = value;
 186         break;
 187     case PCIL0_PTM1LA:
 188         pci->ptm[0].la = value;
 189         break;
 190     case PCIL0_PTM2MS:
 191         pci->ptm[1].ms = value;
 192         break;
 193     case PCIL0_PTM2LA:
 194         pci->ptm[1].la = value;
 195         break;
 196
 197     default:
 198         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 199                (unsigned long)offset);
 200         break;
 201     }
 202 }
 203
 204 static uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
 205 {
 206     struct PPC4xxPCIState *pci = opaque;
 207     uint32_t value;
 208
 209     switch (offset) {
 210     case PCIL0_PMM0LA:
 211         value = pci->pmm[0].la;
 212         break;
 213     case PCIL0_PMM0MA:
 214         value = pci->pmm[0].ma;
 215         break;
 216     case PCIL0_PMM0PCIHA:
 217         value = pci->pmm[0].pciha;
 218         break;
 219     case PCIL0_PMM0PCILA:
 220         value = pci->pmm[0].pcila;
 221         break;
 222
 223     case PCIL0_PMM1LA:
 224         value = pci->pmm[1].la;
 225         break;
 226     case PCIL0_PMM1MA:
 227         value = pci->pmm[1].ma;
 228         break;
 229     case PCIL0_PMM1PCIHA:
 230         value = pci->pmm[1].pciha;
 231         break;
 232     case PCIL0_PMM1PCILA:
 233         value = pci->pmm[1].pcila;
 234         break;
 235
 236     case PCIL0_PMM2LA:
 237         value = pci->pmm[2].la;
 238         break;
 239     case PCIL0_PMM2MA:
 240         value = pci->pmm[2].ma;
 241         break;
 242     case PCIL0_PMM2PCIHA:
 243         value = pci->pmm[2].pciha;
 244         break;
 245     case PCIL0_PMM2PCILA:
 246         value = pci->pmm[2].pcila;
 247         break;
 248
 249     case PCIL0_PTM1MS:
 250         value = pci->ptm[0].ms;
 251         break;
 252     case PCIL0_PTM1LA:
 253         value = pci->ptm[0].la;
 254         break;
 255     case PCIL0_PTM2MS:
 256         value = pci->ptm[1].ms;
 257         break;
 258     case PCIL0_PTM2LA:
 259         value = pci->ptm[1].la;
 260         break;
 261
 262     default:
 263         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 264                (unsigned long)offset);
 265         value = 0;
 266     }
 267
 268 #ifdef TARGET_WORDS_BIGENDIAN
 269     value = bswap32(value);
 270 #endif
 271
 272     return value;
 273 }
 274
 275 static CPUReadMemoryFunc * const pci_reg_read[] = {
 276     &ppc4xx_pci_reg_read4,
 277     &ppc4xx_pci_reg_read4,
 278     &ppc4xx_pci_reg_read4,
 279 };
 280
 281 static CPUWriteMemoryFunc * const pci_reg_write[] = {
 282     &ppc4xx_pci_reg_write4,
 283     &ppc4xx_pci_reg_write4,
 284     &ppc4xx_pci_reg_write4,
 285 };
 286
 287 static void ppc4xx_pci_reset(void *opaque)
 288 {
 289     struct PPC4xxPCIState *pci = opaque;
 290
 291     memset(pci->pmm, 0, sizeof(pci->pmm));
 292     memset(pci->ptm, 0, sizeof(pci->ptm));
 293 }
 294
 295 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 296  * may need further refactoring for other boards. */
 297 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 298 {
 299     int slot = pci_dev->devfn >> 3;
 300
 301     DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
 302             pci_dev->devfn, irq_num, slot);
 303
 304     return slot - 1;
 305 }
 306
 307 static void ppc4xx_pci_set_irq(qemu_irq *pci_irqs, int irq_num, int level)
 308 {
 309     DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
 310     qemu_set_irq(pci_irqs[irq_num], level);
 311 }
 312
 313 static void ppc4xx_pci_save(QEMUFile *f, void *opaque)
 314 {
 315     PPC4xxPCIState *controller = opaque;
 316     int i;
 317
 318     pci_device_save(controller->pci_dev, f);
 319
 320     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 321         qemu_put_be32s(f, &controller->pmm[i].la);
 322         qemu_put_be32s(f, &controller->pmm[i].ma);
 323         qemu_put_be32s(f, &controller->pmm[i].pcila);
 324         qemu_put_be32s(f, &controller->pmm[i].pciha);
 325     }
 326
 327     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 328         qemu_put_be32s(f, &controller->ptm[i].ms);
 329         qemu_put_be32s(f, &controller->ptm[i].la);
 330     }
 331 }
 332
 333 static int ppc4xx_pci_load(QEMUFile *f, void *opaque, int version_id)
 334 {
 335     PPC4xxPCIState *controller = opaque;
 336     int i;
 337
 338     if (version_id != 1)
 339         return -EINVAL;
 340
 341     pci_device_load(controller->pci_dev, f);
 342
 343     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 344         qemu_get_be32s(f, &controller->pmm[i].la);
 345         qemu_get_be32s(f, &controller->pmm[i].ma);
 346         qemu_get_be32s(f, &controller->pmm[i].pcila);
 347         qemu_get_be32s(f, &controller->pmm[i].pciha);
 348     }
 349
 350     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 351         qemu_get_be32s(f, &controller->ptm[i].ms);
 352         qemu_get_be32s(f, &controller->ptm[i].la);
 353     }
 354
 355     return 0;
 356 }
 357
 358 /* XXX Interrupt acknowledge cycles not supported. */
 359 PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
 360                         target_phys_addr_t config_space,
 361                         target_phys_addr_t int_ack,
 362                         target_phys_addr_t special_cycle,
 363                         target_phys_addr_t registers)
 364 {
 365     PPC4xxPCIState *controller;
 366     int index;
 367     static int ppc4xx_pci_id;
 368     uint8_t *pci_conf;
 369
 370     controller = qemu_mallocz(sizeof(PPC4xxPCIState));
 371
 372     controller->pci_state.bus = pci_register_bus(NULL, "pci",
 373                                                  ppc4xx_pci_set_irq,
 374                                                  ppc4xx_pci_map_irq,
 375                                                  pci_irqs, 0, 4);
 376
 377     controller->pci_dev = pci_register_device(controller->pci_state.bus,
 378                                               "host bridge", sizeof(PCIDevice),
 379                                               0, NULL, NULL);
 380     pci_conf = controller->pci_dev->config;
 381     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_IBM);
 382     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_IBM_440GX);
 383     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);
 384
 385     /* CFGADDR */
 386     index = cpu_register_io_memory(pci4xx_cfgaddr_read,
 387                                    pci4xx_cfgaddr_write, controller);
 388     if (index < 0)
 389         goto free;
 390     cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);
 391
 392     /* CFGDATA */
 393     index = cpu_register_io_memory(pci4xx_cfgdata_read,
 394                                    pci4xx_cfgdata_write,
 395                                    &controller->pci_state);
 396     if (index < 0)
 397         goto free;
 398     cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);
 399
 400     /* Internal registers */
 401     index = cpu_register_io_memory(pci_reg_read, pci_reg_write, controller);
 402     if (index < 0)
 403         goto free;
 404     cpu_register_physical_memory(registers, PCI_REG_SIZE, index);
 405
 406     qemu_register_reset(ppc4xx_pci_reset, controller);
 407
 408     /* XXX load/save code not tested. */
 409     register_savevm("ppc4xx_pci", ppc4xx_pci_id++, 1,
 410                     ppc4xx_pci_save, ppc4xx_pci_load, controller);
 411
 412     return controller->pci_state.bus;
 413
 414 free:
 415     printf("%s error\n", __func__);
 416     qemu_free(controller);
 417     return NULL;
 418 }