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 "bswap.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 };
  58 typedef struct PPC4xxPCIState PPC4xxPCIState;
  59
  60 #define PCIC0_CFGADDR       0x0
  61 #define PCIC0_CFGDATA       0x4
  62
  63 /* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
  64  * PCI accesses. */
  65 #define PCIL0_PMM0LA        0x0
  66 #define PCIL0_PMM0MA        0x4
  67 #define PCIL0_PMM0PCILA     0x8
  68 #define PCIL0_PMM0PCIHA     0xc
  69 #define PCIL0_PMM1LA        0x10
  70 #define PCIL0_PMM1MA        0x14
  71 #define PCIL0_PMM1PCILA     0x18
  72 #define PCIL0_PMM1PCIHA     0x1c
  73 #define PCIL0_PMM2LA        0x20
  74 #define PCIL0_PMM2MA        0x24
  75 #define PCIL0_PMM2PCILA     0x28
  76 #define PCIL0_PMM2PCIHA     0x2c
  77
  78 /* PCI Target Map (PTM) registers specify which PCI addresses are translated to
  79  * PLB accesses. */
  80 #define PCIL0_PTM1MS        0x30
  81 #define PCIL0_PTM1LA        0x34
  82 #define PCIL0_PTM2MS        0x38
  83 #define PCIL0_PTM2LA        0x3c
  84 #define PCI_REG_SIZE        0x40
  85
  86
  87 static uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
  88 {
  89     PPC4xxPCIState *ppc4xx_pci = opaque;
  90
  91     return ppc4xx_pci->pci_state.config_reg;
  92 }
  93
  94 static CPUReadMemoryFunc * const pci4xx_cfgaddr_read[] = {
  95     &pci4xx_cfgaddr_readl,
  96     &pci4xx_cfgaddr_readl,
  97     &pci4xx_cfgaddr_readl,
  98 };
  99
 100 static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
 101                                   uint32_t value)
 102 {
 103     PPC4xxPCIState *ppc4xx_pci = opaque;
 104
 105 #ifdef TARGET_WORDS_BIGENDIAN
 106     value = bswap32(value);
 107 #endif
 108
 109     ppc4xx_pci->pci_state.config_reg = value & ~0x3;
 110 }
 111
 112 static CPUWriteMemoryFunc * const pci4xx_cfgaddr_write[] = {
 113     &pci4xx_cfgaddr_writel,
 114     &pci4xx_cfgaddr_writel,
 115     &pci4xx_cfgaddr_writel,
 116 };
 117
 118 static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
 119                                   uint32_t value)
 120 {
 121     struct PPC4xxPCIState *pci = opaque;
 122
 123 #ifdef TARGET_WORDS_BIGENDIAN
 124     value = bswap32(value);
 125 #endif
 126
 127     /* We ignore all target attempts at PCI configuration, effectively
 128      * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
 129
 130     switch (offset) {
 131     case PCIL0_PMM0LA:
 132         pci->pmm[0].la = value;
 133         break;
 134     case PCIL0_PMM0MA:
 135         pci->pmm[0].ma = value;
 136         break;
 137     case PCIL0_PMM0PCIHA:
 138         pci->pmm[0].pciha = value;
 139         break;
 140     case PCIL0_PMM0PCILA:
 141         pci->pmm[0].pcila = value;
 142         break;
 143
 144     case PCIL0_PMM1LA:
 145         pci->pmm[1].la = value;
 146         break;
 147     case PCIL0_PMM1MA:
 148         pci->pmm[1].ma = value;
 149         break;
 150     case PCIL0_PMM1PCIHA:
 151         pci->pmm[1].pciha = value;
 152         break;
 153     case PCIL0_PMM1PCILA:
 154         pci->pmm[1].pcila = value;
 155         break;
 156
 157     case PCIL0_PMM2LA:
 158         pci->pmm[2].la = value;
 159         break;
 160     case PCIL0_PMM2MA:
 161         pci->pmm[2].ma = value;
 162         break;
 163     case PCIL0_PMM2PCIHA:
 164         pci->pmm[2].pciha = value;
 165         break;
 166     case PCIL0_PMM2PCILA:
 167         pci->pmm[2].pcila = value;
 168         break;
 169
 170     case PCIL0_PTM1MS:
 171         pci->ptm[0].ms = value;
 172         break;
 173     case PCIL0_PTM1LA:
 174         pci->ptm[0].la = value;
 175         break;
 176     case PCIL0_PTM2MS:
 177         pci->ptm[1].ms = value;
 178         break;
 179     case PCIL0_PTM2LA:
 180         pci->ptm[1].la = value;
 181         break;
 182
 183     default:
 184         printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
 185                (unsigned long)offset);
 186         break;
 187     }
 188 }
 189
 190 static uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
 191 {
 192     struct PPC4xxPCIState *pci = opaque;
 193     uint32_t value;
 194
 195     switch (offset) {
 196     case PCIL0_PMM0LA:
 197         value = pci->pmm[0].la;
 198         break;
 199     case PCIL0_PMM0MA:
 200         value = pci->pmm[0].ma;
 201         break;
 202     case PCIL0_PMM0PCIHA:
 203         value = pci->pmm[0].pciha;
 204         break;
 205     case PCIL0_PMM0PCILA:
 206         value = pci->pmm[0].pcila;
 207         break;
 208
 209     case PCIL0_PMM1LA:
 210         value = pci->pmm[1].la;
 211         break;
 212     case PCIL0_PMM1MA:
 213         value = pci->pmm[1].ma;
 214         break;
 215     case PCIL0_PMM1PCIHA:
 216         value = pci->pmm[1].pciha;
 217         break;
 218     case PCIL0_PMM1PCILA:
 219         value = pci->pmm[1].pcila;
 220         break;
 221
 222     case PCIL0_PMM2LA:
 223         value = pci->pmm[2].la;
 224         break;
 225     case PCIL0_PMM2MA:
 226         value = pci->pmm[2].ma;
 227         break;
 228     case PCIL0_PMM2PCIHA:
 229         value = pci->pmm[2].pciha;
 230         break;
 231     case PCIL0_PMM2PCILA:
 232         value = pci->pmm[2].pcila;
 233         break;
 234
 235     case PCIL0_PTM1MS:
 236         value = pci->ptm[0].ms;
 237         break;
 238     case PCIL0_PTM1LA:
 239         value = pci->ptm[0].la;
 240         break;
 241     case PCIL0_PTM2MS:
 242         value = pci->ptm[1].ms;
 243         break;
 244     case PCIL0_PTM2LA:
 245         value = pci->ptm[1].la;
 246         break;
 247
 248     default:
 249         printf("%s: invalid PCI internal register 0x%lx\n", __func__,
 250                (unsigned long)offset);
 251         value = 0;
 252     }
 253
 254 #ifdef TARGET_WORDS_BIGENDIAN
 255     value = bswap32(value);
 256 #endif
 257
 258     return value;
 259 }
 260
 261 static CPUReadMemoryFunc * const pci_reg_read[] = {
 262     &ppc4xx_pci_reg_read4,
 263     &ppc4xx_pci_reg_read4,
 264     &ppc4xx_pci_reg_read4,
 265 };
 266
 267 static CPUWriteMemoryFunc * const pci_reg_write[] = {
 268     &ppc4xx_pci_reg_write4,
 269     &ppc4xx_pci_reg_write4,
 270     &ppc4xx_pci_reg_write4,
 271 };
 272
 273 static void ppc4xx_pci_reset(void *opaque)
 274 {
 275     struct PPC4xxPCIState *pci = opaque;
 276
 277     memset(pci->pmm, 0, sizeof(pci->pmm));
 278     memset(pci->ptm, 0, sizeof(pci->ptm));
 279 }
 280
 281 /* On Bamboo, all pins from each slot are tied to a single board IRQ. This
 282  * may need further refactoring for other boards. */
 283 static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
 284 {
 285     int slot = pci_dev->devfn >> 3;
 286
 287     DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
 288             pci_dev->devfn, irq_num, slot);
 289
 290     return slot - 1;
 291 }
 292
 293 static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
 294 {
 295     qemu_irq *pci_irqs = opaque;
 296
 297     DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
 298     qemu_set_irq(pci_irqs[irq_num], level);
 299 }
 300
 301 static void ppc4xx_pci_save(QEMUFile *f, void *opaque)
 302 {
 303     PPC4xxPCIState *controller = opaque;
 304     int i;
 305
 306     pci_device_save(controller->pci_dev, f);
 307
 308     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 309         qemu_put_be32s(f, &controller->pmm[i].la);
 310         qemu_put_be32s(f, &controller->pmm[i].ma);
 311         qemu_put_be32s(f, &controller->pmm[i].pcila);
 312         qemu_put_be32s(f, &controller->pmm[i].pciha);
 313     }
 314
 315     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 316         qemu_put_be32s(f, &controller->ptm[i].ms);
 317         qemu_put_be32s(f, &controller->ptm[i].la);
 318     }
 319 }
 320
 321 static int ppc4xx_pci_load(QEMUFile *f, void *opaque, int version_id)
 322 {
 323     PPC4xxPCIState *controller = opaque;
 324     int i;
 325
 326     if (version_id != 1)
 327         return -EINVAL;
 328
 329     pci_device_load(controller->pci_dev, f);
 330
 331     for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
 332         qemu_get_be32s(f, &controller->pmm[i].la);
 333         qemu_get_be32s(f, &controller->pmm[i].ma);
 334         qemu_get_be32s(f, &controller->pmm[i].pcila);
 335         qemu_get_be32s(f, &controller->pmm[i].pciha);
 336     }
 337
 338     for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
 339         qemu_get_be32s(f, &controller->ptm[i].ms);
 340         qemu_get_be32s(f, &controller->ptm[i].la);
 341     }
 342
 343     return 0;
 344 }
 345
 346 /* XXX Interrupt acknowledge cycles not supported. */
 347 PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
 348                         target_phys_addr_t config_space,
 349                         target_phys_addr_t int_ack,
 350                         target_phys_addr_t special_cycle,
 351                         target_phys_addr_t registers)
 352 {
 353     PPC4xxPCIState *controller;
 354     int index;
 355     static int ppc4xx_pci_id;
 356     uint8_t *pci_conf;
 357
 358     controller = qemu_mallocz(sizeof(PPC4xxPCIState));
 359
 360     controller->pci_state.bus = pci_register_bus(NULL, "pci",
 361                                                  ppc4xx_pci_set_irq,
 362                                                  ppc4xx_pci_map_irq,
 363                                                  pci_irqs, 0, 4);
 364
 365     controller->pci_dev = pci_register_device(controller->pci_state.bus,
 366                                               "host bridge", sizeof(PCIDevice),
 367                                               0, NULL, NULL);
 368     pci_conf = controller->pci_dev->config;
 369     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_IBM);
 370     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_IBM_440GX);
 371     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_OTHER);
 372
 373     /* CFGADDR */
 374     index = cpu_register_io_memory(pci4xx_cfgaddr_read,
 375                                    pci4xx_cfgaddr_write, controller);
 376     if (index < 0)
 377         goto free;
 378     cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);
 379
 380     /* CFGDATA */
 381     index = pci_host_data_register_mmio(&controller->pci_state, 1);
 382     if (index < 0)
 383         goto free;
 384     cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);
 385
 386     /* Internal registers */
 387     index = cpu_register_io_memory(pci_reg_read, pci_reg_write, controller);
 388     if (index < 0)
 389         goto free;
 390     cpu_register_physical_memory(registers, PCI_REG_SIZE, index);
 391
 392     qemu_register_reset(ppc4xx_pci_reset, controller);
 393
 394     /* XXX load/save code not tested. */
 395     register_savevm(&controller->pci_dev->qdev, "ppc4xx_pci", ppc4xx_pci_id++,
 396                     1, ppc4xx_pci_save, ppc4xx_pci_load, controller);
 397
 398     return controller->pci_state.bus;
 399
 400 free:
 401     printf("%s error\n", __func__);
 402     qemu_free(controller);
 403     return NULL;
 404 }