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, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2008
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  */
  19
  20 /* This file implements emulation of the 32-bit PCI controller found in some
  21  * 4xx SoCs, such as the 440EP. */
  22
  23 #include "hw.h"
  24 #include "ppc.h"
  25 #include "ppc4xx.h"
  26
  27 typedef target_phys_addr_t pci_addr_t;
  28 #include "pci.h"
  29 #include "pci_host.h"
  30 #include "bswap.h"
  31
  32 #undef DEBUG
  33 #ifdef DEBUG
  34 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  35 #else
  36 #define DPRINTF(fmt, ...)
  37 #endif /* DEBUG */
  38
  39 struct PCIMasterMap {
  40     uint32_t la;
  41     uint32_t ma;
  42     uint32_t pcila;
  43     uint32_t pciha;
  44 };
  45
  46 struct PCITargetMap {
  47     uint32_t ms;
  48     uint32_t la;
  49 };
  50
  51 #define PPC4xx_PCI_NR_PMMS 3
  52 #define PPC4xx_PCI_NR_PTMS 2
  53
  54 struct PPC4xxPCIState {
  55     struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
  56     struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
  57
  58     PCIHostState pci_state;
  59     PCIDevice *pci_dev;
  60 };
  61 typedef struct PPC4xxPCIState PPC4xxPCIState;
  62
  63 #define PCIC0_CFGADDR       0x0
  64 #define PCIC0_CFGDATA       0x4
  65
  66 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  67  * PCI accesses. */
  68 #define PCIL0_PMM0LA        0x0
  69 #define PCIL0_PMM0MA        0x4
  70 #define PCIL0_PMM0PCILA     0x8
  71 #define PCIL0_PMM0PCIHA     0xc
  72 #define PCIL0_PMM1LA        0x10
  73 #define PCIL0_PMM1MA        0x14
  74 #define PCIL0_PMM1PCILA     0x18
  75 #define PCIL0_PMM1PCIHA     0x1c
  76 #define PCIL0_PMM2LA        0x20
  77 #define PCIL0_PMM2MA        0x24
  78 #define PCIL0_PMM2PCILA     0x28
  79 #define PCIL0_PMM2PCIHA     0x2c
  80
  81 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  82  * PLB accesses. */
  83 #define PCIL0_PTM1MS        0x30
  84 #define PCIL0_PTM1LA        0x34
  85 #define PCIL0_PTM2MS        0x38
  86 #define PCIL0_PTM2LA        0x3c
  87 #define PCI_REG_SIZE        0x40
  88
  89
  90 static uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
  91 {
  92     PPC4xxPCIState *ppc4xx_pci = opaque;
  93
  94     return ppc4xx_pci->pci_state.config_reg;
  95 }
  96
  97 static CPUReadMemoryFunc *pci4xx_cfgaddr_read[] = {
  98     &pci4xx_cfgaddr_readl,
  99     &pci4xx_cfgaddr_readl,
 100     &pci4xx_cfgaddr_readl,
 101 };
 102
 103 static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
 104                                   uint32_t value)
 105 {
 106     PPC4xxPCIState *ppc4xx_pci = opaque;
 107
 108 #ifdef TARGET_WORDS_BIGENDIAN
 109     value = bswap32(value);
 110 #endif
 111
 112     ppc4xx_pci->pci_state.config_reg = value & ~0x3;
 113 }
 114
 115 static CPUWriteMemoryFunc *pci4xx_cfgaddr_write[] = {
 116     &pci4xx_cfgaddr_writel,
 117     &pci4xx_cfgaddr_writel,
 118     &pci4xx_cfgaddr_writel,
 119 };
 120
 121 static CPUReadMemoryFunc *pci4xx_cfgdata_read[] = {
 122     &pci_host_data_readb,
 123     &pci_host_data_readw,
 124     &pci_host_data_readl,
 125 };
 126
 127 static CPUWriteMemoryFunc *pci4xx_cfgdata_write[] = {
 128     &pci_host_data_writeb,
 129     &pci_host_data_writew,
 130     &pci_host_data_writel,
 131 };
 132
 133 static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
 134                                   uint32_t value)
 135 {
 136     struct PPC4xxPCIState *pci = opaque;
 137
 138 #ifdef TARGET_WORDS_BIGENDIAN
 139     value = bswap32(value);
 140 #endif
 141
 142     /* We ignore all target attempts at PCI configuration, effectively
 143      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 144
 145     switch (offset) {
 146     case PCIL0_PMM0LA:
 147         pci->pmm[0].la = value;
 148         break;
 149     case PCIL0_PMM0MA:
 150         pci->pmm[0].ma = value;
 151         break;
 152     case PCIL0_PMM0PCIHA:
 153         pci->pmm[0].pciha = value;
 154         break;
 155     case PCIL0_PMM0PCILA:
 156         pci->pmm[0].pcila = value;
 157         break;
 158
 159     case PCIL0_PMM1LA:
 160         pci->pmm[1].la = value;
 161         break;
 162     case PCIL0_PMM1MA:
 163         pci->pmm[1].ma = value;
 164         break;
 165     case PCIL0_PMM1PCIHA:
 166         pci->pmm[1].pciha = value;
 167         break;
 168     case PCIL0_PMM1PCILA:
 169         pci->pmm[1].pcila = value;
 170         break;
 171
 172     case PCIL0_PMM2LA:
 173         pci->pmm[2].la = value;
 174         break;
 175     case PCIL0_PMM2MA:
 176         pci->pmm[2].ma = value;
 177         break;
 178     case PCIL0_PMM2PCIHA:
 179         pci->pmm[2].pciha = value;
 180         break;
 181     case PCIL0_PMM2PCILA:
 182         pci->pmm[2].pcila = value;
 183         break;
 184
 185     case PCIL0_PTM1MS:
 186         pci->ptm[0].ms = value;
 187         break;
 188     case PCIL0_PTM1LA:
 189         pci->ptm[0].la = value;
 190         break;
 191     case PCIL0_PTM2MS:
 192         pci->ptm[1].ms = value;
 193         break;
 194     case PCIL0_PTM2LA:
 195         pci->ptm[1].la = value;
 196         break;
 197
 198     default:
 199         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 200                (unsigned long)offset);
 201         break;
 202     }
 203 }
 204
 205 static uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
 206 {
 207     struct PPC4xxPCIState *pci = opaque;
 208     uint32_t value;
 209
 210     switch (offset) {
 211     case PCIL0_PMM0LA:
 212         value = pci->pmm[0].la;
 213         break;
 214     case PCIL0_PMM0MA:
 215         value = pci->pmm[0].ma;
 216         break;
 217     case PCIL0_PMM0PCIHA:
 218         value = pci->pmm[0].pciha;
 219         break;
 220     case PCIL0_PMM0PCILA:
 221         value = pci->pmm[0].pcila;
 222         break;
 223
 224     case PCIL0_PMM1LA:
 225         value = pci->pmm[1].la;
 226         break;
 227     case PCIL0_PMM1MA:
 228         value = pci->pmm[1].ma;
 229         break;
 230     case PCIL0_PMM1PCIHA:
 231         value = pci->pmm[1].pciha;
 232         break;
 233     case PCIL0_PMM1PCILA:
 234         value = pci->pmm[1].pcila;
 235         break;
 236
 237     case PCIL0_PMM2LA:
 238         value = pci->pmm[2].la;
 239         break;
 240     case PCIL0_PMM2MA:
 241         value = pci->pmm[2].ma;
 242         break;
 243     case PCIL0_PMM2PCIHA:
 244         value = pci->pmm[2].pciha;
 245         break;
 246     case PCIL0_PMM2PCILA:
 247         value = pci->pmm[2].pcila;
 248         break;
 249
 250     case PCIL0_PTM1MS:
 251         value = pci->ptm[0].ms;
 252         break;
 253     case PCIL0_PTM1LA:
 254         value = pci->ptm[0].la;
 255         break;
 256     case PCIL0_PTM2MS:
 257         value = pci->ptm[1].ms;
 258         break;
 259     case PCIL0_PTM2LA:
 260         value = pci->ptm[1].la;
 261         break;
 262
 263     default:
 264         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 265                (unsigned long)offset);
 266         value = 0;
 267     }
 268
 269 #ifdef TARGET_WORDS_BIGENDIAN
 270     value = bswap32(value);
 271 #endif
 272
 273     return value;
 274 }
 275
 276 static CPUReadMemoryFunc *pci_reg_read[] = {
 277     &ppc4xx_pci_reg_read4,
 278     &ppc4xx_pci_reg_read4,
 279     &ppc4xx_pci_reg_read4,
 280 };
 281
 282 static CPUWriteMemoryFunc *pci_reg_write[] = {
 283     &ppc4xx_pci_reg_write4,
 284     &ppc4xx_pci_reg_write4,
 285     &ppc4xx_pci_reg_write4,
 286 };
 287
 288 static void ppc4xx_pci_reset(void *opaque)
 289 {
 290     struct PPC4xxPCIState *pci = opaque;
 291
 292     memset(pci->pmm, 0, sizeof(pci->pmm));
 293     memset(pci->ptm, 0, sizeof(pci->ptm));
 294 }
 295
 296 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 297  * may need further refactoring for other boards. */
 298 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 299 {
 300     int slot = pci_dev->devfn >> 3;
 301
 302     DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
 303             pci_dev->devfn, irq_num, slot);
 304
 305     return slot - 1;
 306 }
 307
 308 static void ppc4xx_pci_set_irq(qemu_irq *pci_irqs, int irq_num, int level)
 309 {
 310     DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
 311     qemu_set_irq(pci_irqs[irq_num], level);
 312 }
 313
 314 static void ppc4xx_pci_save(QEMUFile *f, void *opaque)
 315 {
 316     PPC4xxPCIState *controller = opaque;
 317     int i;
 318
 319     pci_device_save(controller->pci_dev, f);
 320
 321     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 322         qemu_put_be32s(f, &controller->pmm[i].la);
 323         qemu_put_be32s(f, &controller->pmm[i].ma);
 324         qemu_put_be32s(f, &controller->pmm[i].pcila);
 325         qemu_put_be32s(f, &controller->pmm[i].pciha);
 326     }
 327
 328     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 329         qemu_put_be32s(f, &controller->ptm[i].ms);
 330         qemu_put_be32s(f, &controller->ptm[i].la);
 331     }
 332 }
 333
 334 static int ppc4xx_pci_load(QEMUFile *f, void *opaque, int version_id)
 335 {
 336     PPC4xxPCIState *controller = opaque;
 337     int i;
 338
 339     if (version_id != 1)
 340         return -EINVAL;
 341
 342     pci_device_load(controller->pci_dev, f);
 343
 344     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 345         qemu_get_be32s(f, &controller->pmm[i].la);
 346         qemu_get_be32s(f, &controller->pmm[i].ma);
 347         qemu_get_be32s(f, &controller->pmm[i].pcila);
 348         qemu_get_be32s(f, &controller->pmm[i].pciha);
 349     }
 350
 351     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 352         qemu_get_be32s(f, &controller->ptm[i].ms);
 353         qemu_get_be32s(f, &controller->ptm[i].la);
 354     }
 355
 356     return 0;
 357 }
 358
 359 /* XXX Interrupt acknowledge cycles not supported. */
 360 PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
 361                         target_phys_addr_t config_space,
 362                         target_phys_addr_t int_ack,
 363                         target_phys_addr_t special_cycle,
 364                         target_phys_addr_t registers)
 365 {
 366     PPC4xxPCIState *controller;
 367     int index;
 368     static int ppc4xx_pci_id;
 369     uint8_t *pci_conf;
 370
 371     controller = qemu_mallocz(sizeof(PPC4xxPCIState));
 372
 373     controller->pci_state.bus = pci_register_bus(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(0, 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(0, 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(0, 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 }