hw/apb_pci.c

   1 /*
   2  * QEMU Ultrasparc APB PCI host
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* XXX This file and most of its contents are somewhat misnamed.  The
  26    Ultrasparc PCI host is called the PCI Bus Module (PBM).  The APB is
  27    the secondary PCI bridge.  */
  28
  29 #include "sysbus.h"
  30 #include "pci.h"
  31 #include "pci_host.h"
  32 #include "rwhandler.h"
  33 #include "apb_pci.h"
  34
  35 /* debug APB */
  36 //#define DEBUG_APB
  37
  38 #ifdef DEBUG_APB
  39 #define APB_DPRINTF(fmt, ...) \
  40 do { printf("APB: " fmt , ## __VA_ARGS__); } while (0)
  41 #else
  42 #define APB_DPRINTF(fmt, ...)
  43 #endif
  44
  45 /*
  46  * Chipset docs:
  47  * PBM: "UltraSPARC IIi User's Manual",
  48  * http://www.sun.com/processors/manuals/805-0087.pdf
  49  *
  50  * APB: "Advanced PCI Bridge (APB) User's Manual",
  51  * http://www.sun.com/processors/manuals/805-1251.pdf
  52  */
  53
  54 #define PBM_PCI_IMR_MASK    0x7fffffff
  55 #define PBM_PCI_IMR_ENABLED 0x80000000
  56
  57 #define POR          (1 << 31)
  58 #define SOFT_POR     (1 << 30)
  59 #define SOFT_XIR     (1 << 29)
  60 #define BTN_POR      (1 << 28)
  61 #define BTN_XIR      (1 << 27)
  62 #define RESET_MASK   0xf8000000
  63 #define RESET_WCMASK 0x98000000
  64 #define RESET_WMASK  0x60000000
  65
  66 typedef struct APBState {
  67     SysBusDevice busdev;
  68     PCIBus      *bus;
  69     ReadWriteHandler pci_config_handler;
  70     uint32_t iommu[4];
  71     uint32_t pci_control[16];
  72     uint32_t pci_irq_map[8];
  73     uint32_t obio_irq_map[32];
  74     qemu_irq pci_irqs[32];
  75     uint32_t reset_control;
  76     unsigned int nr_resets;
  77 } APBState;
  78
  79 static void apb_config_writel (void *opaque, target_phys_addr_t addr,
  80                                uint32_t val)
  81 {
  82     APBState *s = opaque;
  83
  84     APB_DPRINTF("%s: addr " TARGET_FMT_lx " val %x\n", __func__, addr, val);
  85
  86     switch (addr & 0xffff) {
  87     case 0x30 ... 0x4f: /* DMA error registers */
  88         /* XXX: not implemented yet */
  89         break;
  90     case 0x200 ... 0x20b: /* IOMMU */
  91         s->iommu[(addr & 0xf) >> 2] = val;
  92         break;
  93     case 0x20c ... 0x3ff: /* IOMMU flush */
  94         break;
  95     case 0xc00 ... 0xc3f: /* PCI interrupt control */
  96         if (addr & 4) {
  97             s->pci_irq_map[(addr & 0x3f) >> 3] &= PBM_PCI_IMR_MASK;
  98             s->pci_irq_map[(addr & 0x3f) >> 3] |= val & ~PBM_PCI_IMR_MASK;
  99         }
 100         break;
 101     case 0x2000 ... 0x202f: /* PCI control */
 102         s->pci_control[(addr & 0x3f) >> 2] = val;
 103         break;
 104     case 0xf020 ... 0xf027: /* Reset control */
 105         if (addr & 4) {
 106             val &= RESET_MASK;
 107             s->reset_control &= ~(val & RESET_WCMASK);
 108             s->reset_control |= val & RESET_WMASK;
 109             if (val & SOFT_POR) {
 110                 s->nr_resets = 0;
 111                 qemu_system_reset_request();
 112             } else if (val & SOFT_XIR) {
 113                 qemu_system_reset_request();
 114             }
 115         }
 116         break;
 117     case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */
 118     case 0xa400 ... 0xa67f: /* IOMMU diagnostics */
 119     case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
 120     case 0xf000 ... 0xf01f: /* FFB config, memory control */
 121         /* we don't care */
 122     default:
 123         break;
 124     }
 125 }
 126
 127 static uint32_t apb_config_readl (void *opaque,
 128                                   target_phys_addr_t addr)
 129 {
 130     APBState *s = opaque;
 131     uint32_t val;
 132
 133     switch (addr & 0xffff) {
 134     case 0x30 ... 0x4f: /* DMA error registers */
 135         val = 0;
 136         /* XXX: not implemented yet */
 137         break;
 138     case 0x200 ... 0x20b: /* IOMMU */
 139         val = s->iommu[(addr & 0xf) >> 2];
 140         break;
 141     case 0x20c ... 0x3ff: /* IOMMU flush */
 142         val = 0;
 143         break;
 144     case 0xc00 ... 0xc3f: /* PCI interrupt control */
 145         if (addr & 4) {
 146             val = s->pci_irq_map[(addr & 0x3f) >> 3];
 147         } else {
 148             val = 0;
 149         }
 150         break;
 151     case 0x2000 ... 0x202f: /* PCI control */
 152         val = s->pci_control[(addr & 0x3f) >> 2];
 153         break;
 154     case 0xf020 ... 0xf027: /* Reset control */
 155         if (addr & 4) {
 156             val = s->reset_control;
 157         } else {
 158             val = 0;
 159         }
 160         break;
 161     case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */
 162     case 0xa400 ... 0xa67f: /* IOMMU diagnostics */
 163     case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
 164     case 0xf000 ... 0xf01f: /* FFB config, memory control */
 165         /* we don't care */
 166     default:
 167         val = 0;
 168         break;
 169     }
 170     APB_DPRINTF("%s: addr " TARGET_FMT_lx " -> %x\n", __func__, addr, val);
 171
 172     return val;
 173 }
 174
 175 static CPUWriteMemoryFunc * const apb_config_write[] = {
 176     &apb_config_writel,
 177     &apb_config_writel,
 178     &apb_config_writel,
 179 };
 180
 181 static CPUReadMemoryFunc * const apb_config_read[] = {
 182     &apb_config_readl,
 183     &apb_config_readl,
 184     &apb_config_readl,
 185 };
 186
 187 static void apb_pci_config_write(ReadWriteHandler *h, pcibus_t addr,
 188                                  uint32_t val, int size)
 189 {
 190     APBState *s = container_of(h, APBState, pci_config_handler);
 191
 192     val = qemu_bswap_len(val, size);
 193     APB_DPRINTF("%s: addr " TARGET_FMT_lx " val %x\n", __func__, addr, val);
 194     pci_data_write(s->bus, addr, val, size);
 195 }
 196
 197 static uint32_t apb_pci_config_read(ReadWriteHandler *h, pcibus_t addr,
 198                                     int size)
 199 {
 200     uint32_t ret;
 201     APBState *s = container_of(h, APBState, pci_config_handler);
 202
 203     ret = pci_data_read(s->bus, addr, size);
 204     ret = qemu_bswap_len(ret, size);
 205     APB_DPRINTF("%s: addr " TARGET_FMT_lx " -> %x\n", __func__, addr, ret);
 206     return ret;
 207 }
 208
 209 static void pci_apb_iowriteb (void *opaque, target_phys_addr_t addr,
 210                                   uint32_t val)
 211 {
 212     cpu_outb(addr & IOPORTS_MASK, val);
 213 }
 214
 215 static void pci_apb_iowritew (void *opaque, target_phys_addr_t addr,
 216                                   uint32_t val)
 217 {
 218     cpu_outw(addr & IOPORTS_MASK, bswap16(val));
 219 }
 220
 221 static void pci_apb_iowritel (void *opaque, target_phys_addr_t addr,
 222                                 uint32_t val)
 223 {
 224     cpu_outl(addr & IOPORTS_MASK, bswap32(val));
 225 }
 226
 227 static uint32_t pci_apb_ioreadb (void *opaque, target_phys_addr_t addr)
 228 {
 229     uint32_t val;
 230
 231     val = cpu_inb(addr & IOPORTS_MASK);
 232     return val;
 233 }
 234
 235 static uint32_t pci_apb_ioreadw (void *opaque, target_phys_addr_t addr)
 236 {
 237     uint32_t val;
 238
 239     val = bswap16(cpu_inw(addr & IOPORTS_MASK));
 240     return val;
 241 }
 242
 243 static uint32_t pci_apb_ioreadl (void *opaque, target_phys_addr_t addr)
 244 {
 245     uint32_t val;
 246
 247     val = bswap32(cpu_inl(addr & IOPORTS_MASK));
 248     return val;
 249 }
 250
 251 static CPUWriteMemoryFunc * const pci_apb_iowrite[] = {
 252     &pci_apb_iowriteb,
 253     &pci_apb_iowritew,
 254     &pci_apb_iowritel,
 255 };
 256
 257 static CPUReadMemoryFunc * const pci_apb_ioread[] = {
 258     &pci_apb_ioreadb,
 259     &pci_apb_ioreadw,
 260     &pci_apb_ioreadl,
 261 };
 262
 263 /* The APB host has an IRQ line for each IRQ line of each slot.  */
 264 static int pci_apb_map_irq(PCIDevice *pci_dev, int irq_num)
 265 {
 266     return ((pci_dev->devfn & 0x18) >> 1) + irq_num;
 267 }
 268
 269 static int pci_pbm_map_irq(PCIDevice *pci_dev, int irq_num)
 270 {
 271     int bus_offset;
 272     if (pci_dev->devfn & 1)
 273         bus_offset = 16;
 274     else
 275         bus_offset = 0;
 276     return bus_offset + irq_num;
 277 }
 278
 279 static void pci_apb_set_irq(void *opaque, int irq_num, int level)
 280 {
 281     APBState *s = opaque;
 282
 283     /* PCI IRQ map onto the first 32 INO.  */
 284     if (irq_num < 32) {
 285         if (s->pci_irq_map[irq_num >> 2] & PBM_PCI_IMR_ENABLED) {
 286             APB_DPRINTF("%s: set irq %d level %d\n", __func__, irq_num, level);
 287             qemu_set_irq(s->pci_irqs[irq_num], level);
 288         } else {
 289             APB_DPRINTF("%s: not enabled: lower irq %d\n", __func__, irq_num);
 290             qemu_irq_lower(s->pci_irqs[irq_num]);
 291         }
 292     }
 293 }
 294
 295 static void apb_pci_bridge_init(PCIBus *b)
 296 {
 297     PCIDevice *dev = pci_bridge_get_device(b);
 298
 299     /*
 300      * command register:
 301      * According to PCI bridge spec, after reset
 302      *   bus master bit is off
 303      *   memory space enable bit is off
 304      * According to manual (805-1251.pdf).
 305      *   the reset value should be zero unless the boot pin is tied high
 306      *   (which is true) and thus it should be PCI_COMMAND_MEMORY.
 307      */
 308     pci_set_word(dev->config + PCI_COMMAND,
 309                  PCI_COMMAND_MEMORY);
 310     pci_set_word(dev->config + PCI_STATUS,
 311                  PCI_STATUS_FAST_BACK | PCI_STATUS_66MHZ |
 312                  PCI_STATUS_DEVSEL_MEDIUM);
 313     pci_set_byte(dev->config + PCI_REVISION_ID, 0x11);
 314     pci_set_byte(dev->config + PCI_HEADER_TYPE,
 315                  pci_get_byte(dev->config + PCI_HEADER_TYPE) |
 316                  PCI_HEADER_TYPE_MULTI_FUNCTION);
 317 }
 318
 319 PCIBus *pci_apb_init(target_phys_addr_t special_base,
 320                      target_phys_addr_t mem_base,
 321                      qemu_irq *pic, PCIBus **bus2, PCIBus **bus3)
 322 {
 323     DeviceState *dev;
 324     SysBusDevice *s;
 325     APBState *d;
 326     unsigned int i;
 327
 328     /* Ultrasparc PBM main bus */
 329     dev = qdev_create(NULL, "pbm");
 330     qdev_init_nofail(dev);
 331     s = sysbus_from_qdev(dev);
 332     /* apb_config */
 333     sysbus_mmio_map(s, 0, special_base);
 334     /* PCI configuration space */
 335     sysbus_mmio_map(s, 1, special_base + 0x1000000ULL);
 336     /* pci_ioport */
 337     sysbus_mmio_map(s, 2, special_base + 0x2000000ULL);
 338     d = FROM_SYSBUS(APBState, s);
 339
 340     d->bus = pci_register_bus(&d->busdev.qdev, "pci",
 341                                          pci_apb_set_irq, pci_pbm_map_irq, d,
 342                                          0, 32);
 343     pci_bus_set_mem_base(d->bus, mem_base);
 344
 345     for (i = 0; i < 32; i++) {
 346         sysbus_connect_irq(s, i, pic[i]);
 347     }
 348
 349     pci_create_simple(d->bus, 0, "pbm");
 350
 351     /* APB secondary busses */
 352     *bus2 = pci_bridge_init(d->bus, PCI_DEVFN(1, 0),
 353                             PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_SIMBA,
 354                             pci_apb_map_irq,
 355                             "Advanced PCI Bus secondary bridge 1");
 356     apb_pci_bridge_init(*bus2);
 357
 358     *bus3 = pci_bridge_init(d->bus, PCI_DEVFN(1, 1),
 359                             PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_SIMBA,
 360                             pci_apb_map_irq,
 361                             "Advanced PCI Bus secondary bridge 2");
 362     apb_pci_bridge_init(*bus3);
 363
 364     return d->bus;
 365 }
 366
 367 static void pci_pbm_reset(DeviceState *d)
 368 {
 369     unsigned int i;
 370     APBState *s = container_of(d, APBState, busdev.qdev);
 371
 372     for (i = 0; i < 8; i++) {
 373         s->pci_irq_map[i] &= PBM_PCI_IMR_MASK;
 374     }
 375
 376     if (s->nr_resets++ == 0) {
 377         /* Power on reset */
 378         s->reset_control = POR;
 379     }
 380 }
 381
 382 static int pci_pbm_init_device(SysBusDevice *dev)
 383 {
 384     APBState *s;
 385     int pci_config, apb_config, pci_ioport;
 386     unsigned int i;
 387
 388     s = FROM_SYSBUS(APBState, dev);
 389     for (i = 0; i < 8; i++) {
 390         s->pci_irq_map[i] = (0x1f << 6) | (i << 2);
 391     }
 392     for (i = 0; i < 32; i++) {
 393         sysbus_init_irq(dev, &s->pci_irqs[i]);
 394     }
 395
 396     /* apb_config */
 397     apb_config = cpu_register_io_memory(apb_config_read,
 398                                         apb_config_write, s);
 399     /* at region 0 */
 400     sysbus_init_mmio(dev, 0x10000ULL, apb_config);
 401
 402     /* PCI configuration space */
 403     s->pci_config_handler.read = apb_pci_config_read;
 404     s->pci_config_handler.write = apb_pci_config_write;
 405     pci_config = cpu_register_io_memory_simple(&s->pci_config_handler);
 406     assert(pci_config >= 0);
 407     /* at region 1 */
 408     sysbus_init_mmio(dev, 0x1000000ULL, pci_config);
 409
 410     /* pci_ioport */
 411     pci_ioport = cpu_register_io_memory(pci_apb_ioread,
 412                                         pci_apb_iowrite, s);
 413     /* at region 2 */
 414     sysbus_init_mmio(dev, 0x10000ULL, pci_ioport);
 415
 416     return 0;
 417 }
 418
 419 static int pbm_pci_host_init(PCIDevice *d)
 420 {
 421     pci_config_set_vendor_id(d->config, PCI_VENDOR_ID_SUN);
 422     pci_config_set_device_id(d->config, PCI_DEVICE_ID_SUN_SABRE);
 423     pci_set_word(d->config + PCI_COMMAND,
 424                  PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 425     pci_set_word(d->config + PCI_STATUS,
 426                  PCI_STATUS_FAST_BACK | PCI_STATUS_66MHZ |
 427                  PCI_STATUS_DEVSEL_MEDIUM);
 428     pci_config_set_class(d->config, PCI_CLASS_BRIDGE_HOST);
 429     pci_set_byte(d->config + PCI_HEADER_TYPE,
 430                  PCI_HEADER_TYPE_NORMAL);
 431     return 0;
 432 }
 433
 434 static PCIDeviceInfo pbm_pci_host_info = {
 435     .qdev.name = "pbm",
 436     .qdev.size = sizeof(PCIDevice),
 437     .init      = pbm_pci_host_init,
 438     .header_type  = PCI_HEADER_TYPE_BRIDGE,
 439 };
 440
 441 static SysBusDeviceInfo pbm_host_info = {
 442     .qdev.name = "pbm",
 443     .qdev.size = sizeof(APBState),
 444     .qdev.reset = pci_pbm_reset,
 445     .init = pci_pbm_init_device,
 446 };
 447 static void pbm_register_devices(void)
 448 {
 449     sysbus_register_withprop(&pbm_host_info);
 450     pci_qdev_register(&pbm_pci_host_info);
 451 }
 452
 453 device_init(pbm_register_devices)