hw/sun4m_iommu.c

   1 /*
   2  * QEMU Sun4m iommu emulation
   3  *
   4  * Copyright (c) 2003-2005 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 #include "hw/sun4m.h"
  26 #include "hw/sysbus.h"
  27 #include "trace.h"
  28
  29 /*
  30  * I/O MMU used by Sun4m systems
  31  *
  32  * Chipset docs:
  33  * "Sun-4M System Architecture (revision 2.0) by Chuck Narad", 950-1373-01,
  34  * http://mediacast.sun.com/users/Barton808/media/Sun4M_SystemArchitecture_edited2.pdf
  35  */
  36
  37 #define IOMMU_NREGS         (4*4096/4)
  38 #define IOMMU_CTRL          (0x0000 >> 2)
  39 #define IOMMU_CTRL_IMPL     0xf0000000 /* Implementation */
  40 #define IOMMU_CTRL_VERS     0x0f000000 /* Version */
  41 #define IOMMU_CTRL_RNGE     0x0000001c /* Mapping RANGE */
  42 #define IOMMU_RNGE_16MB     0x00000000 /* 0xff000000 -> 0xffffffff */
  43 #define IOMMU_RNGE_32MB     0x00000004 /* 0xfe000000 -> 0xffffffff */
  44 #define IOMMU_RNGE_64MB     0x00000008 /* 0xfc000000 -> 0xffffffff */
  45 #define IOMMU_RNGE_128MB    0x0000000c /* 0xf8000000 -> 0xffffffff */
  46 #define IOMMU_RNGE_256MB    0x00000010 /* 0xf0000000 -> 0xffffffff */
  47 #define IOMMU_RNGE_512MB    0x00000014 /* 0xe0000000 -> 0xffffffff */
  48 #define IOMMU_RNGE_1GB      0x00000018 /* 0xc0000000 -> 0xffffffff */
  49 #define IOMMU_RNGE_2GB      0x0000001c /* 0x80000000 -> 0xffffffff */
  50 #define IOMMU_CTRL_ENAB     0x00000001 /* IOMMU Enable */
  51 #define IOMMU_CTRL_MASK     0x0000001d
  52
  53 #define IOMMU_BASE          (0x0004 >> 2)
  54 #define IOMMU_BASE_MASK     0x07fffc00
  55
  56 #define IOMMU_TLBFLUSH      (0x0014 >> 2)
  57 #define IOMMU_TLBFLUSH_MASK 0xffffffff
  58
  59 #define IOMMU_PGFLUSH       (0x0018 >> 2)
  60 #define IOMMU_PGFLUSH_MASK  0xffffffff
  61
  62 #define IOMMU_AFSR          (0x1000 >> 2)
  63 #define IOMMU_AFSR_ERR      0x80000000 /* LE, TO, or BE asserted */
  64 #define IOMMU_AFSR_LE       0x40000000 /* SBUS reports error after
  65                                           transaction */
  66 #define IOMMU_AFSR_TO       0x20000000 /* Write access took more than
  67                                           12.8 us. */
  68 #define IOMMU_AFSR_BE       0x10000000 /* Write access received error
  69                                           acknowledge */
  70 #define IOMMU_AFSR_SIZE     0x0e000000 /* Size of transaction causing error */
  71 #define IOMMU_AFSR_S        0x01000000 /* Sparc was in supervisor mode */
  72 #define IOMMU_AFSR_RESV     0x00800000 /* Reserved, forced to 0x8 by
  73                                           hardware */
  74 #define IOMMU_AFSR_ME       0x00080000 /* Multiple errors occurred */
  75 #define IOMMU_AFSR_RD       0x00040000 /* A read operation was in progress */
  76 #define IOMMU_AFSR_FAV      0x00020000 /* IOMMU afar has valid contents */
  77 #define IOMMU_AFSR_MASK     0xff0fffff
  78
  79 #define IOMMU_AFAR          (0x1004 >> 2)
  80
  81 #define IOMMU_AER           (0x1008 >> 2) /* Arbiter Enable Register */
  82 #define IOMMU_AER_EN_P0_ARB 0x00000001    /* MBus master 0x8 (Always 1) */
  83 #define IOMMU_AER_EN_P1_ARB 0x00000002    /* MBus master 0x9 */
  84 #define IOMMU_AER_EN_P2_ARB 0x00000004    /* MBus master 0xa */
  85 #define IOMMU_AER_EN_P3_ARB 0x00000008    /* MBus master 0xb */
  86 #define IOMMU_AER_EN_0      0x00010000    /* SBus slot 0 */
  87 #define IOMMU_AER_EN_1      0x00020000    /* SBus slot 1 */
  88 #define IOMMU_AER_EN_2      0x00040000    /* SBus slot 2 */
  89 #define IOMMU_AER_EN_3      0x00080000    /* SBus slot 3 */
  90 #define IOMMU_AER_EN_F      0x00100000    /* SBus on-board */
  91 #define IOMMU_AER_SBW       0x80000000    /* S-to-M asynchronous writes */
  92 #define IOMMU_AER_MASK      0x801f000f
  93
  94 #define IOMMU_SBCFG0        (0x1010 >> 2) /* SBUS configration per-slot */
  95 #define IOMMU_SBCFG1        (0x1014 >> 2) /* SBUS configration per-slot */
  96 #define IOMMU_SBCFG2        (0x1018 >> 2) /* SBUS configration per-slot */
  97 #define IOMMU_SBCFG3        (0x101c >> 2) /* SBUS configration per-slot */
  98 #define IOMMU_SBCFG_SAB30   0x00010000 /* Phys-address bit 30 when
  99                                           bypass enabled */
 100 #define IOMMU_SBCFG_BA16    0x00000004 /* Slave supports 16 byte bursts */
 101 #define IOMMU_SBCFG_BA8     0x00000002 /* Slave supports 8 byte bursts */
 102 #define IOMMU_SBCFG_BYPASS  0x00000001 /* Bypass IOMMU, treat all addresses
 103                                           produced by this device as pure
 104                                           physical. */
 105 #define IOMMU_SBCFG_MASK    0x00010003
 106
 107 #define IOMMU_ARBEN         (0x2000 >> 2) /* SBUS arbitration enable */
 108 #define IOMMU_ARBEN_MASK    0x001f0000
 109 #define IOMMU_MID           0x00000008
 110
 111 #define IOMMU_MASK_ID       (0x3018 >> 2) /* Mask ID */
 112 #define IOMMU_MASK_ID_MASK  0x00ffffff
 113
 114 #define IOMMU_MSII_MASK     0x26000000 /* microSPARC II mask number */
 115 #define IOMMU_TS_MASK       0x23000000 /* turboSPARC mask number */
 116
 117 /* The format of an iopte in the page tables */
 118 #define IOPTE_PAGE          0xffffff00 /* Physical page number (PA[35:12]) */
 119 #define IOPTE_CACHE         0x00000080 /* Cached (in vme IOCACHE or
 120                                           Viking/MXCC) */
 121 #define IOPTE_WRITE         0x00000004 /* Writable */
 122 #define IOPTE_VALID         0x00000002 /* IOPTE is valid */
 123 #define IOPTE_WAZ           0x00000001 /* Write as zeros */
 124
 125 #define IOMMU_PAGE_SHIFT    12
 126 #define IOMMU_PAGE_SIZE     (1 << IOMMU_PAGE_SHIFT)
 127 #define IOMMU_PAGE_MASK     ~(IOMMU_PAGE_SIZE - 1)
 128
 129 typedef struct IOMMUState {
 130     SysBusDevice busdev;
 131     MemoryRegion iomem;
 132     uint32_t regs[IOMMU_NREGS];
 133     hwaddr iostart;
 134     qemu_irq irq;
 135     uint32_t version;
 136 } IOMMUState;
 137
 138 static uint64_t iommu_mem_read(void *opaque, hwaddr addr,
 139                                unsigned size)
 140 {
 141     IOMMUState *s = opaque;
 142     hwaddr saddr;
 143     uint32_t ret;
 144
 145     saddr = addr >> 2;
 146     switch (saddr) {
 147     default:
 148         ret = s->regs[saddr];
 149         break;
 150     case IOMMU_AFAR:
 151     case IOMMU_AFSR:
 152         ret = s->regs[saddr];
 153         qemu_irq_lower(s->irq);
 154         break;
 155     }
 156     trace_sun4m_iommu_mem_readl(saddr, ret);
 157     return ret;
 158 }
 159
 160 static void iommu_mem_write(void *opaque, hwaddr addr,
 161                             uint64_t val, unsigned size)
 162 {
 163     IOMMUState *s = opaque;
 164     hwaddr saddr;
 165
 166     saddr = addr >> 2;
 167     trace_sun4m_iommu_mem_writel(saddr, val);
 168     switch (saddr) {
 169     case IOMMU_CTRL:
 170         switch (val & IOMMU_CTRL_RNGE) {
 171         case IOMMU_RNGE_16MB:
 172             s->iostart = 0xffffffffff000000ULL;
 173             break;
 174         case IOMMU_RNGE_32MB:
 175             s->iostart = 0xfffffffffe000000ULL;
 176             break;
 177         case IOMMU_RNGE_64MB:
 178             s->iostart = 0xfffffffffc000000ULL;
 179             break;
 180         case IOMMU_RNGE_128MB:
 181             s->iostart = 0xfffffffff8000000ULL;
 182             break;
 183         case IOMMU_RNGE_256MB:
 184             s->iostart = 0xfffffffff0000000ULL;
 185             break;
 186         case IOMMU_RNGE_512MB:
 187             s->iostart = 0xffffffffe0000000ULL;
 188             break;
 189         case IOMMU_RNGE_1GB:
 190             s->iostart = 0xffffffffc0000000ULL;
 191             break;
 192         default:
 193         case IOMMU_RNGE_2GB:
 194             s->iostart = 0xffffffff80000000ULL;
 195             break;
 196         }
 197         trace_sun4m_iommu_mem_writel_ctrl(s->iostart);
 198         s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);
 199         break;
 200     case IOMMU_BASE:
 201         s->regs[saddr] = val & IOMMU_BASE_MASK;
 202         break;
 203     case IOMMU_TLBFLUSH:
 204         trace_sun4m_iommu_mem_writel_tlbflush(val);
 205         s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
 206         break;
 207     case IOMMU_PGFLUSH:
 208         trace_sun4m_iommu_mem_writel_pgflush(val);
 209         s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
 210         break;
 211     case IOMMU_AFAR:
 212         s->regs[saddr] = val;
 213         qemu_irq_lower(s->irq);
 214         break;
 215     case IOMMU_AER:
 216         s->regs[saddr] = (val & IOMMU_AER_MASK) | IOMMU_AER_EN_P0_ARB;
 217         break;
 218     case IOMMU_AFSR:
 219         s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV;
 220         qemu_irq_lower(s->irq);
 221         break;
 222     case IOMMU_SBCFG0:
 223     case IOMMU_SBCFG1:
 224     case IOMMU_SBCFG2:
 225     case IOMMU_SBCFG3:
 226         s->regs[saddr] = val & IOMMU_SBCFG_MASK;
 227         break;
 228     case IOMMU_ARBEN:
 229         // XXX implement SBus probing: fault when reading unmapped
 230         // addresses, fault cause and address stored to MMU/IOMMU
 231         s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;
 232         break;
 233     case IOMMU_MASK_ID:
 234         s->regs[saddr] |= val & IOMMU_MASK_ID_MASK;
 235         break;
 236     default:
 237         s->regs[saddr] = val;
 238         break;
 239     }
 240 }
 241
 242 static const MemoryRegionOps iommu_mem_ops = {
 243     .read = iommu_mem_read,
 244     .write = iommu_mem_write,
 245     .endianness = DEVICE_NATIVE_ENDIAN,
 246     .valid = {
 247         .min_access_size = 4,
 248         .max_access_size = 4,
 249     },
 250 };
 251
 252 static uint32_t iommu_page_get_flags(IOMMUState *s, hwaddr addr)
 253 {
 254     uint32_t ret;
 255     hwaddr iopte;
 256     hwaddr pa = addr;
 257
 258     iopte = s->regs[IOMMU_BASE] << 4;
 259     addr &= ~s->iostart;
 260     iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3;
 261     cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);
 262     tswap32s(&ret);
 263     trace_sun4m_iommu_page_get_flags(pa, iopte, ret);
 264     return ret;
 265 }
 266
 267 static hwaddr iommu_translate_pa(hwaddr addr,
 268                                              uint32_t pte)
 269 {
 270     hwaddr pa;
 271
 272     pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK);
 273     trace_sun4m_iommu_translate_pa(addr, pa, pte);
 274     return pa;
 275 }
 276
 277 static void iommu_bad_addr(IOMMUState *s, hwaddr addr,
 278                            int is_write)
 279 {
 280     trace_sun4m_iommu_bad_addr(addr);
 281     s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV |
 282         IOMMU_AFSR_FAV;
 283     if (!is_write)
 284         s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD;
 285     s->regs[IOMMU_AFAR] = addr;
 286     qemu_irq_raise(s->irq);
 287 }
 288
 289 void sparc_iommu_memory_rw(void *opaque, hwaddr addr,
 290                            uint8_t *buf, int len, int is_write)
 291 {
 292     int l;
 293     uint32_t flags;
 294     hwaddr page, phys_addr;
 295
 296     while (len > 0) {
 297         page = addr & IOMMU_PAGE_MASK;
 298         l = (page + IOMMU_PAGE_SIZE) - addr;
 299         if (l > len)
 300             l = len;
 301         flags = iommu_page_get_flags(opaque, page);
 302         if (!(flags & IOPTE_VALID)) {
 303             iommu_bad_addr(opaque, page, is_write);
 304             return;
 305         }
 306         phys_addr = iommu_translate_pa(addr, flags);
 307         if (is_write) {
 308             if (!(flags & IOPTE_WRITE)) {
 309                 iommu_bad_addr(opaque, page, is_write);
 310                 return;
 311             }
 312             cpu_physical_memory_write(phys_addr, buf, l);
 313         } else {
 314             cpu_physical_memory_read(phys_addr, buf, l);
 315         }
 316         len -= l;
 317         buf += l;
 318         addr += l;
 319     }
 320 }
 321
 322 static const VMStateDescription vmstate_iommu = {
 323     .name ="iommu",
 324     .version_id = 2,
 325     .minimum_version_id = 2,
 326     .minimum_version_id_old = 2,
 327     .fields      = (VMStateField []) {
 328         VMSTATE_UINT32_ARRAY(regs, IOMMUState, IOMMU_NREGS),
 329         VMSTATE_UINT64(iostart, IOMMUState),
 330         VMSTATE_END_OF_LIST()
 331     }
 332 };
 333
 334 static void iommu_reset(DeviceState *d)
 335 {
 336     IOMMUState *s = container_of(d, IOMMUState, busdev.qdev);
 337
 338     memset(s->regs, 0, IOMMU_NREGS * 4);
 339     s->iostart = 0;
 340     s->regs[IOMMU_CTRL] = s->version;
 341     s->regs[IOMMU_ARBEN] = IOMMU_MID;
 342     s->regs[IOMMU_AFSR] = IOMMU_AFSR_RESV;
 343     s->regs[IOMMU_AER] = IOMMU_AER_EN_P0_ARB | IOMMU_AER_EN_P1_ARB;
 344     s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK;
 345 }
 346
 347 static int iommu_init1(SysBusDevice *dev)
 348 {
 349     IOMMUState *s = FROM_SYSBUS(IOMMUState, dev);
 350
 351     sysbus_init_irq(dev, &s->irq);
 352
 353     memory_region_init_io(&s->iomem, &iommu_mem_ops, s, "iommu",
 354                           IOMMU_NREGS * sizeof(uint32_t));
 355     sysbus_init_mmio(dev, &s->iomem);
 356
 357     return 0;
 358 }
 359
 360 static Property iommu_properties[] = {
 361     DEFINE_PROP_HEX32("version", IOMMUState, version, 0),
 362     DEFINE_PROP_END_OF_LIST(),
 363 };
 364
 365 static void iommu_class_init(ObjectClass *klass, void *data)
 366 {
 367     DeviceClass *dc = DEVICE_CLASS(klass);
 368     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 369
 370     k->init = iommu_init1;
 371     dc->reset = iommu_reset;
 372     dc->vmsd = &vmstate_iommu;
 373     dc->props = iommu_properties;
 374 }
 375
 376 static const TypeInfo iommu_info = {
 377     .name          = "iommu",
 378     .parent        = TYPE_SYS_BUS_DEVICE,
 379     .instance_size = sizeof(IOMMUState),
 380     .class_init    = iommu_class_init,
 381 };
 382
 383 static void iommu_register_types(void)
 384 {
 385     type_register_static(&iommu_info);
 386 }
 387
 388 type_init(iommu_register_types)