hw/omap_gpmc.c

   1 /*
   2  * TI OMAP general purpose memory controller emulation.
   3  *
   4  * Copyright (C) 2007-2009 Nokia Corporation
   5  * Original code written by Andrzej Zaborowski <andrew@openedhand.com>
   6  * Enhancements for OMAP3 and NAND support written by Juha Riihimäki
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 or
  11  * (at your option) any later version of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21 #include "hw.h"
  22 #include "flash.h"
  23 #include "omap.h"
  24 #include "memory.h"
  25 #include "exec-memory.h"
  26
  27 /* General-Purpose Memory Controller */
  28 struct omap_gpmc_s {
  29     qemu_irq irq;
  30     qemu_irq drq;
  31     MemoryRegion iomem;
  32     int accept_256;
  33
  34     uint8_t revision;
  35     uint8_t sysconfig;
  36     uint16_t irqst;
  37     uint16_t irqen;
  38     uint16_t lastirq;
  39     uint16_t timeout;
  40     uint16_t config;
  41     struct omap_gpmc_cs_file_s {
  42         uint32_t config[7];
  43         MemoryRegion *iomem;
  44         MemoryRegion container;
  45         MemoryRegion nandiomem;
  46         DeviceState *dev;
  47     } cs_file[8];
  48     int ecc_cs;
  49     int ecc_ptr;
  50     uint32_t ecc_cfg;
  51     ECCState ecc[9];
  52     struct prefetch {
  53         uint32_t config1; /* GPMC_PREFETCH_CONFIG1 */
  54         uint32_t transfercount; /* GPMC_PREFETCH_CONFIG2:TRANSFERCOUNT */
  55         int startengine; /* GPMC_PREFETCH_CONTROL:STARTENGINE */
  56         int fifopointer; /* GPMC_PREFETCH_STATUS:FIFOPOINTER */
  57         int count; /* GPMC_PREFETCH_STATUS:COUNTVALUE */
  58         MemoryRegion iomem;
  59         uint8_t fifo[64];
  60     } prefetch;
  61 };
  62
  63 #define OMAP_GPMC_8BIT 0
  64 #define OMAP_GPMC_16BIT 1
  65 #define OMAP_GPMC_NOR 0
  66 #define OMAP_GPMC_NAND 2
  67
  68 static int omap_gpmc_devtype(struct omap_gpmc_cs_file_s *f)
  69 {
  70     return (f->config[0] >> 10) & 3;
  71 }
  72
  73 static int omap_gpmc_devsize(struct omap_gpmc_cs_file_s *f)
  74 {
  75     /* devsize field is really 2 bits but we ignore the high
  76      * bit to ensure consistent behaviour if the guest sets
  77      * it (values 2 and 3 are reserved in the TRM)
  78      */
  79     return (f->config[0] >> 12) & 1;
  80 }
  81
  82 /* Extract the chip-select value from the prefetch config1 register */
  83 static int prefetch_cs(uint32_t config1)
  84 {
  85     return (config1 >> 24) & 7;
  86 }
  87
  88 static int prefetch_threshold(uint32_t config1)
  89 {
  90     return (config1 >> 8) & 0x7f;
  91 }
  92
  93 static void omap_gpmc_int_update(struct omap_gpmc_s *s)
  94 {
  95     /* The TRM is a bit unclear, but it seems to say that
  96      * the TERMINALCOUNTSTATUS bit is set only on the
  97      * transition when the prefetch engine goes from
  98      * active to inactive, whereas the FIFOEVENTSTATUS
  99      * bit is held high as long as the fifo has at
 100      * least THRESHOLD bytes available.
 101      * So we do the latter here, but TERMINALCOUNTSTATUS
 102      * is set elsewhere.
 103      */
 104     if (s->prefetch.fifopointer >= prefetch_threshold(s->prefetch.config1)) {
 105         s->irqst |= 1;
 106     }
 107     if ((s->irqen & s->irqst) != s->lastirq) {
 108         s->lastirq = s->irqen & s->irqst;
 109         qemu_set_irq(s->irq, s->lastirq);
 110     }
 111 }
 112
 113 static void omap_gpmc_dma_update(struct omap_gpmc_s *s, int value)
 114 {
 115     if (s->prefetch.config1 & 4) {
 116         qemu_set_irq(s->drq, value);
 117     }
 118 }
 119
 120 /* Access functions for when a NAND-like device is mapped into memory:
 121  * all addresses in the region behave like accesses to the relevant
 122  * GPMC_NAND_DATA_i register (which is actually implemented to call these)
 123  */
 124 static uint64_t omap_nand_read(void *opaque, target_phys_addr_t addr,
 125                                unsigned size)
 126 {
 127     struct omap_gpmc_cs_file_s *f = (struct omap_gpmc_cs_file_s *)opaque;
 128     uint64_t v;
 129     nand_setpins(f->dev, 0, 0, 0, 1, 0);
 130     switch (omap_gpmc_devsize(f)) {
 131     case OMAP_GPMC_8BIT:
 132         v = nand_getio(f->dev);
 133         if (size == 1) {
 134             return v;
 135         }
 136         v |= (nand_getio(f->dev) << 8);
 137         if (size == 2) {
 138             return v;
 139         }
 140         v |= (nand_getio(f->dev) << 16);
 141         v |= (nand_getio(f->dev) << 24);
 142         return v;
 143     case OMAP_GPMC_16BIT:
 144         v = nand_getio(f->dev);
 145         if (size == 1) {
 146             /* 8 bit read from 16 bit device : probably a guest bug */
 147             return v & 0xff;
 148         }
 149         if (size == 2) {
 150             return v;
 151         }
 152         v |= (nand_getio(f->dev) << 16);
 153         return v;
 154     default:
 155         abort();
 156     }
 157 }
 158
 159 static void omap_nand_setio(DeviceState *dev, uint64_t value,
 160                             int nandsize, int size)
 161 {
 162     /* Write the specified value to the NAND device, respecting
 163      * both size of the NAND device and size of the write access.
 164      */
 165     switch (nandsize) {
 166     case OMAP_GPMC_8BIT:
 167         switch (size) {
 168         case 1:
 169             nand_setio(dev, value & 0xff);
 170             break;
 171         case 2:
 172             nand_setio(dev, value & 0xff);
 173             nand_setio(dev, (value >> 8) & 0xff);
 174             break;
 175         case 4:
 176         default:
 177             nand_setio(dev, value & 0xff);
 178             nand_setio(dev, (value >> 8) & 0xff);
 179             nand_setio(dev, (value >> 16) & 0xff);
 180             nand_setio(dev, (value >> 24) & 0xff);
 181             break;
 182         }
 183         break;
 184     case OMAP_GPMC_16BIT:
 185         switch (size) {
 186         case 1:
 187             /* writing to a 16bit device with 8bit access is probably a guest
 188              * bug; pass the value through anyway.
 189              */
 190         case 2:
 191             nand_setio(dev, value & 0xffff);
 192             break;
 193         case 4:
 194         default:
 195             nand_setio(dev, value & 0xffff);
 196             nand_setio(dev, (value >> 16) & 0xffff);
 197             break;
 198         }
 199         break;
 200     }
 201 }
 202
 203 static void omap_nand_write(void *opaque, target_phys_addr_t addr,
 204                             uint64_t value, unsigned size)
 205 {
 206     struct omap_gpmc_cs_file_s *f = (struct omap_gpmc_cs_file_s *)opaque;
 207     nand_setpins(f->dev, 0, 0, 0, 1, 0);
 208     omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size);
 209 }
 210
 211 static const MemoryRegionOps omap_nand_ops = {
 212     .read = omap_nand_read,
 213     .write = omap_nand_write,
 214     .endianness = DEVICE_NATIVE_ENDIAN,
 215 };
 216
 217 static void fill_prefetch_fifo(struct omap_gpmc_s *s)
 218 {
 219     /* Fill the prefetch FIFO by reading data from NAND.
 220      * We do this synchronously, unlike the hardware which
 221      * will do this asynchronously. We refill when the
 222      * FIFO has THRESHOLD bytes free, and we always refill
 223      * as much data as possible starting at the top end
 224      * of the FIFO.
 225      * (We have to refill at THRESHOLD rather than waiting
 226      * for the FIFO to empty to allow for the case where
 227      * the FIFO size isn't an exact multiple of THRESHOLD
 228      * and we're doing DMA transfers.)
 229      * This means we never need to handle wrap-around in
 230      * the fifo-reading code, and the next byte of data
 231      * to read is always fifo[63 - fifopointer].
 232      */
 233     int fptr;
 234     int cs = prefetch_cs(s->prefetch.config1);
 235     int is16bit = (((s->cs_file[cs].config[0] >> 12) & 3) != 0);
 236     int bytes;
 237     /* Don't believe the bit of the OMAP TRM that says that COUNTVALUE
 238      * and TRANSFERCOUNT are in units of 16 bit words for 16 bit NAND.
 239      * Instead believe the bit that says it is always a byte count.
 240      */
 241     bytes = 64 - s->prefetch.fifopointer;
 242     if (bytes > s->prefetch.count) {
 243         bytes = s->prefetch.count;
 244     }
 245     s->prefetch.count -= bytes;
 246     s->prefetch.fifopointer += bytes;
 247     fptr = 64 - s->prefetch.fifopointer;
 248     /* Move the existing data in the FIFO so it sits just
 249      * before what we're about to read in
 250      */
 251     while (fptr < (64 - bytes)) {
 252         s->prefetch.fifo[fptr] = s->prefetch.fifo[fptr + bytes];
 253         fptr++;
 254     }
 255     while (fptr < 64) {
 256         if (is16bit) {
 257             uint32_t v = omap_nand_read(&s->cs_file[cs], 0, 2);
 258             s->prefetch.fifo[fptr++] = v & 0xff;
 259             s->prefetch.fifo[fptr++] = (v >> 8) & 0xff;
 260         } else {
 261             s->prefetch.fifo[fptr++] = omap_nand_read(&s->cs_file[cs], 0, 1);
 262         }
 263     }
 264     if (s->prefetch.startengine && (s->prefetch.count == 0)) {
 265         /* This was the final transfer: raise TERMINALCOUNTSTATUS */
 266         s->irqst |= 2;
 267         s->prefetch.startengine = 0;
 268     }
 269     /* If there are any bytes in the FIFO at this point then
 270      * we must raise a DMA request (either this is a final part
 271      * transfer, or we filled the FIFO in which case we certainly
 272      * have THRESHOLD bytes available)
 273      */
 274     if (s->prefetch.fifopointer != 0) {
 275         omap_gpmc_dma_update(s, 1);
 276     }
 277     omap_gpmc_int_update(s);
 278 }
 279
 280 /* Access functions for a NAND-like device when the prefetch/postwrite
 281  * engine is enabled -- all addresses in the region behave alike:
 282  * data is read or written to the FIFO.
 283  */
 284 static uint64_t omap_gpmc_prefetch_read(void *opaque, target_phys_addr_t addr,
 285                                         unsigned size)
 286 {
 287     struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque;
 288     uint32_t data;
 289     if (s->prefetch.config1 & 1) {
 290         /* The TRM doesn't define the behaviour if you read from the
 291          * FIFO when the prefetch engine is in write mode. We choose
 292          * to always return zero.
 293          */
 294         return 0;
 295     }
 296     /* Note that trying to read an empty fifo repeats the last byte */
 297     if (s->prefetch.fifopointer) {
 298         s->prefetch.fifopointer--;
 299     }
 300     data = s->prefetch.fifo[63 - s->prefetch.fifopointer];
 301     if (s->prefetch.fifopointer ==
 302         (64 - prefetch_threshold(s->prefetch.config1))) {
 303         /* We've drained THRESHOLD bytes now. So deassert the
 304          * DMA request, then refill the FIFO (which will probably
 305          * assert it again.)
 306          */
 307         omap_gpmc_dma_update(s, 0);
 308         fill_prefetch_fifo(s);
 309     }
 310     omap_gpmc_int_update(s);
 311     return data;
 312 }
 313
 314 static void omap_gpmc_prefetch_write(void *opaque, target_phys_addr_t addr,
 315                                      uint64_t value, unsigned size)
 316 {
 317     struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque;
 318     int cs = prefetch_cs(s->prefetch.config1);
 319     if ((s->prefetch.config1 & 1) == 0) {
 320         /* The TRM doesn't define the behaviour of writing to the
 321          * FIFO when the prefetch engine is in read mode. We
 322          * choose to ignore the write.
 323          */
 324         return;
 325     }
 326     if (s->prefetch.count == 0) {
 327         /* The TRM doesn't define the behaviour of writing to the
 328          * FIFO if the transfer is complete. We choose to ignore.
 329          */
 330         return;
 331     }
 332     /* The only reason we do any data buffering in postwrite
 333      * mode is if we are talking to a 16 bit NAND device, in
 334      * which case we need to buffer the first byte of the
 335      * 16 bit word until the other byte arrives.
 336      */
 337     int is16bit = (((s->cs_file[cs].config[0] >> 12) & 3) != 0);
 338     if (is16bit) {
 339         /* fifopointer alternates between 64 (waiting for first
 340          * byte of word) and 63 (waiting for second byte)
 341          */
 342         if (s->prefetch.fifopointer == 64) {
 343             s->prefetch.fifo[0] = value;
 344             s->prefetch.fifopointer--;
 345         } else {
 346             value = (value << 8) | s->prefetch.fifo[0];
 347             omap_nand_write(&s->cs_file[cs], 0, value, 2);
 348             s->prefetch.count--;
 349             s->prefetch.fifopointer = 64;
 350         }
 351     } else {
 352         /* Just write the byte : fifopointer remains 64 at all times */
 353         omap_nand_write(&s->cs_file[cs], 0, value, 1);
 354         s->prefetch.count--;
 355     }
 356     if (s->prefetch.count == 0) {
 357         /* Final transfer: raise TERMINALCOUNTSTATUS */
 358         s->irqst |= 2;
 359         s->prefetch.startengine = 0;
 360     }
 361     omap_gpmc_int_update(s);
 362 }
 363
 364 static const MemoryRegionOps omap_prefetch_ops = {
 365     .read = omap_gpmc_prefetch_read,
 366     .write = omap_gpmc_prefetch_write,
 367     .endianness = DEVICE_NATIVE_ENDIAN,
 368     .impl.min_access_size = 1,
 369     .impl.max_access_size = 1,
 370 };
 371
 372 static MemoryRegion *omap_gpmc_cs_memregion(struct omap_gpmc_s *s, int cs)
 373 {
 374     /* Return the MemoryRegion* to map/unmap for this chipselect */
 375     struct omap_gpmc_cs_file_s *f = &s->cs_file[cs];
 376     if (omap_gpmc_devtype(f) == OMAP_GPMC_NOR) {
 377         return f->iomem;
 378     }
 379     if ((s->prefetch.config1 & 0x80) &&
 380         (prefetch_cs(s->prefetch.config1) == cs)) {
 381         /* The prefetch engine is enabled for this CS: map the FIFO */
 382         return &s->prefetch.iomem;
 383     }
 384     return &f->nandiomem;
 385 }
 386
 387 static void omap_gpmc_cs_map(struct omap_gpmc_s *s, int cs)
 388 {
 389     struct omap_gpmc_cs_file_s *f = &s->cs_file[cs];
 390     uint32_t mask = (f->config[6] >> 8) & 0xf;
 391     uint32_t base = f->config[6] & 0x3f;
 392     uint32_t size;
 393
 394     if (!f->iomem && !f->dev) {
 395         return;
 396     }
 397
 398     if (!(f->config[6] & (1 << 6))) {
 399         /* Do nothing unless CSVALID */
 400         return;
 401     }
 402
 403     /* TODO: check for overlapping regions and report access errors */
 404     if (mask != 0x8 && mask != 0xc && mask != 0xe && mask != 0xf
 405          && !(s->accept_256 && !mask)) {
 406         fprintf(stderr, "%s: invalid chip-select mask address (0x%x)\n",
 407                  __func__, mask);
 408     }
 409
 410     base <<= 24;
 411     size = (0x0fffffff & ~(mask << 24)) + 1;
 412     /* TODO: rather than setting the size of the mapping (which should be
 413      * constant), the mask should cause wrapping of the address space, so
 414      * that the same memory becomes accessible at every <i>size</i> bytes
 415      * starting from <i>base</i>.  */
 416     memory_region_init(&f->container, "omap-gpmc-file", size);
 417     memory_region_add_subregion(&f->container, 0,
 418                                 omap_gpmc_cs_memregion(s, cs));
 419     memory_region_add_subregion(get_system_memory(), base,
 420                                 &f->container);
 421 }
 422
 423 static void omap_gpmc_cs_unmap(struct omap_gpmc_s *s, int cs)
 424 {
 425     struct omap_gpmc_cs_file_s *f = &s->cs_file[cs];
 426     if (!(f->config[6] & (1 << 6))) {
 427         /* Do nothing unless CSVALID */
 428         return;
 429     }
 430     if (!f->iomem && !f->dev) {
 431         return;
 432     }
 433     memory_region_del_subregion(get_system_memory(), &f->container);
 434     memory_region_del_subregion(&f->container, omap_gpmc_cs_memregion(s, cs));
 435     memory_region_destroy(&f->container);
 436 }
 437
 438 void omap_gpmc_reset(struct omap_gpmc_s *s)
 439 {
 440     int i;
 441
 442     s->sysconfig = 0;
 443     s->irqst = 0;
 444     s->irqen = 0;
 445     omap_gpmc_int_update(s);
 446     s->timeout = 0;
 447     s->config = 0xa00;
 448     s->prefetch.config1 = 0x00004000;
 449     s->prefetch.transfercount = 0x00000000;
 450     s->prefetch.startengine = 0;
 451     s->prefetch.fifopointer = 0;
 452     s->prefetch.count = 0;
 453     for (i = 0; i < 8; i ++) {
 454         omap_gpmc_cs_unmap(s, i);
 455         s->cs_file[i].config[1] = 0x101001;
 456         s->cs_file[i].config[2] = 0x020201;
 457         s->cs_file[i].config[3] = 0x10031003;
 458         s->cs_file[i].config[4] = 0x10f1111;
 459         s->cs_file[i].config[5] = 0;
 460         s->cs_file[i].config[6] = 0xf00 | (i ? 0 : 1 << 6);
 461
 462         s->cs_file[i].config[6] = 0xf00;
 463         /* In theory we could probe attached devices for some CFG1
 464          * bits here, but we just retain them across resets as they
 465          * were set initially by omap_gpmc_attach().
 466          */
 467         if (i == 0) {
 468             s->cs_file[i].config[0] &= 0x00433e00;
 469             s->cs_file[i].config[6] |= 1 << 6; /* CSVALID */
 470             omap_gpmc_cs_map(s, i);
 471         } else {
 472             s->cs_file[i].config[0] &= 0x00403c00;
 473         }
 474     }
 475     s->ecc_cs = 0;
 476     s->ecc_ptr = 0;
 477     s->ecc_cfg = 0x3fcff000;
 478     for (i = 0; i < 9; i ++)
 479         ecc_reset(&s->ecc[i]);
 480 }
 481
 482 static int gpmc_wordaccess_only(target_phys_addr_t addr)
 483 {
 484     /* Return true if the register offset is to a register that
 485      * only permits word width accesses.
 486      * Non-word accesses are only OK for GPMC_NAND_DATA/ADDRESS/COMMAND
 487      * for any chipselect.
 488      */
 489     if (addr >= 0x60 && addr <= 0x1d4) {
 490         int cs = (addr - 0x60) / 0x30;
 491         addr -= cs * 0x30;
 492         if (addr >= 0x7c && addr < 0x88) {
 493             /* GPMC_NAND_COMMAND, GPMC_NAND_ADDRESS, GPMC_NAND_DATA */
 494             return 0;
 495         }
 496     }
 497     return 1;
 498 }
 499
 500 static uint64_t omap_gpmc_read(void *opaque, target_phys_addr_t addr,
 501                                unsigned size)
 502 {
 503     struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque;
 504     int cs;
 505     struct omap_gpmc_cs_file_s *f;
 506
 507     if (size != 4 && gpmc_wordaccess_only(addr)) {
 508         return omap_badwidth_read32(opaque, addr);
 509     }
 510
 511     switch (addr) {
 512     case 0x000: /* GPMC_REVISION */
 513         return s->revision;
 514
 515     case 0x010: /* GPMC_SYSCONFIG */
 516         return s->sysconfig;
 517
 518     case 0x014: /* GPMC_SYSSTATUS */
 519         return 1;                                               /* RESETDONE */
 520
 521     case 0x018: /* GPMC_IRQSTATUS */
 522         return s->irqst;
 523
 524     case 0x01c: /* GPMC_IRQENABLE */
 525         return s->irqen;
 526
 527     case 0x040: /* GPMC_TIMEOUT_CONTROL */
 528         return s->timeout;
 529
 530     case 0x044: /* GPMC_ERR_ADDRESS */
 531     case 0x048: /* GPMC_ERR_TYPE */
 532         return 0;
 533
 534     case 0x050: /* GPMC_CONFIG */
 535         return s->config;
 536
 537     case 0x054: /* GPMC_STATUS */
 538         return 0x001;
 539
 540     case 0x060 ... 0x1d4:
 541         cs = (addr - 0x060) / 0x30;
 542         addr -= cs * 0x30;
 543         f = s->cs_file + cs;
 544         switch (addr) {
 545         case 0x60:      /* GPMC_CONFIG1 */
 546             return f->config[0];
 547         case 0x64:      /* GPMC_CONFIG2 */
 548             return f->config[1];
 549         case 0x68:      /* GPMC_CONFIG3 */
 550             return f->config[2];
 551         case 0x6c:      /* GPMC_CONFIG4 */
 552             return f->config[3];
 553         case 0x70:      /* GPMC_CONFIG5 */
 554             return f->config[4];
 555         case 0x74:      /* GPMC_CONFIG6 */
 556             return f->config[5];
 557         case 0x78:      /* GPMC_CONFIG7 */
 558             return f->config[6];
 559         case 0x84 ... 0x87: /* GPMC_NAND_DATA */
 560             if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) {
 561                 return omap_nand_read(f, 0, size);
 562             }
 563             return 0;
 564         }
 565         break;
 566
 567     case 0x1e0: /* GPMC_PREFETCH_CONFIG1 */
 568         return s->prefetch.config1;
 569     case 0x1e4: /* GPMC_PREFETCH_CONFIG2 */
 570         return s->prefetch.transfercount;
 571     case 0x1ec: /* GPMC_PREFETCH_CONTROL */
 572         return s->prefetch.startengine;
 573     case 0x1f0: /* GPMC_PREFETCH_STATUS */
 574         /* NB: The OMAP3 TRM is inconsistent about whether the GPMC
 575          * FIFOTHRESHOLDSTATUS bit should be set when
 576          * FIFOPOINTER > FIFOTHRESHOLD or when it is >= FIFOTHRESHOLD.
 577          * Apparently the underlying functional spec from which the TRM was
 578          * created states that the behaviour is ">=", and this also
 579          * makes more conceptual sense.
 580          */
 581         return (s->prefetch.fifopointer << 24) |
 582                 ((s->prefetch.fifopointer >=
 583                   ((s->prefetch.config1 >> 8) & 0x7f) ? 1 : 0) << 16) |
 584                 s->prefetch.count;
 585
 586     case 0x1f4: /* GPMC_ECC_CONFIG */
 587         return s->ecc_cs;
 588     case 0x1f8: /* GPMC_ECC_CONTROL */
 589         return s->ecc_ptr;
 590     case 0x1fc: /* GPMC_ECC_SIZE_CONFIG */
 591         return s->ecc_cfg;
 592     case 0x200 ... 0x220:       /* GPMC_ECC_RESULT */
 593         cs = (addr & 0x1f) >> 2;
 594         /* TODO: check correctness */
 595         return
 596                 ((s->ecc[cs].cp    &  0x07) <<  0) |
 597                 ((s->ecc[cs].cp    &  0x38) << 13) |
 598                 ((s->ecc[cs].lp[0] & 0x1ff) <<  3) |
 599                 ((s->ecc[cs].lp[1] & 0x1ff) << 19);
 600
 601     case 0x230: /* GPMC_TESTMODE_CTRL */
 602         return 0;
 603     case 0x234: /* GPMC_PSA_LSB */
 604     case 0x238: /* GPMC_PSA_MSB */
 605         return 0x00000000;
 606     }
 607
 608     OMAP_BAD_REG(addr);
 609     return 0;
 610 }
 611
 612 static void omap_gpmc_write(void *opaque, target_phys_addr_t addr,
 613                             uint64_t value, unsigned size)
 614 {
 615     struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque;
 616     int cs;
 617     struct omap_gpmc_cs_file_s *f;
 618
 619     if (size != 4 && gpmc_wordaccess_only(addr)) {
 620         return omap_badwidth_write32(opaque, addr, value);
 621     }
 622
 623     switch (addr) {
 624     case 0x000: /* GPMC_REVISION */
 625     case 0x014: /* GPMC_SYSSTATUS */
 626     case 0x054: /* GPMC_STATUS */
 627     case 0x1f0: /* GPMC_PREFETCH_STATUS */
 628     case 0x200 ... 0x220:       /* GPMC_ECC_RESULT */
 629     case 0x234: /* GPMC_PSA_LSB */
 630     case 0x238: /* GPMC_PSA_MSB */
 631         OMAP_RO_REG(addr);
 632         break;
 633
 634     case 0x010: /* GPMC_SYSCONFIG */
 635         if ((value >> 3) == 0x3)
 636             fprintf(stderr, "%s: bad SDRAM idle mode %"PRIi64"\n",
 637                             __FUNCTION__, value >> 3);
 638         if (value & 2)
 639             omap_gpmc_reset(s);
 640         s->sysconfig = value & 0x19;
 641         break;
 642
 643     case 0x018: /* GPMC_IRQSTATUS */
 644         s->irqst &= ~value;
 645         omap_gpmc_int_update(s);
 646         break;
 647
 648     case 0x01c: /* GPMC_IRQENABLE */
 649         s->irqen = value & 0xf03;
 650         omap_gpmc_int_update(s);
 651         break;
 652
 653     case 0x040: /* GPMC_TIMEOUT_CONTROL */
 654         s->timeout = value & 0x1ff1;
 655         break;
 656
 657     case 0x044: /* GPMC_ERR_ADDRESS */
 658     case 0x048: /* GPMC_ERR_TYPE */
 659         break;
 660
 661     case 0x050: /* GPMC_CONFIG */
 662         s->config = value & 0xf13;
 663         break;
 664
 665     case 0x060 ... 0x1d4:
 666         cs = (addr - 0x060) / 0x30;
 667         addr -= cs * 0x30;
 668         f = s->cs_file + cs;
 669         switch (addr) {
 670         case 0x60:      /* GPMC_CONFIG1 */
 671             f->config[0] = value & 0xffef3e13;
 672             break;
 673         case 0x64:      /* GPMC_CONFIG2 */
 674             f->config[1] = value & 0x001f1f8f;
 675             break;
 676         case 0x68:      /* GPMC_CONFIG3 */
 677             f->config[2] = value & 0x001f1f8f;
 678             break;
 679         case 0x6c:      /* GPMC_CONFIG4 */
 680             f->config[3] = value & 0x1f8f1f8f;
 681             break;
 682         case 0x70:      /* GPMC_CONFIG5 */
 683             f->config[4] = value & 0x0f1f1f1f;
 684             break;
 685         case 0x74:      /* GPMC_CONFIG6 */
 686             f->config[5] = value & 0x00000fcf;
 687             break;
 688         case 0x78:      /* GPMC_CONFIG7 */
 689             if ((f->config[6] ^ value) & 0xf7f) {
 690                 omap_gpmc_cs_unmap(s, cs);
 691                 f->config[6] = value & 0x00000f7f;
 692                 omap_gpmc_cs_map(s, cs);
 693             }
 694             break;
 695         case 0x7c ... 0x7f: /* GPMC_NAND_COMMAND */
 696             if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) {
 697                 nand_setpins(f->dev, 1, 0, 0, 1, 0); /* CLE */
 698                 omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size);
 699             }
 700             break;
 701         case 0x80 ... 0x83: /* GPMC_NAND_ADDRESS */
 702             if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) {
 703                 nand_setpins(f->dev, 0, 1, 0, 1, 0); /* ALE */
 704                 omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size);
 705             }
 706             break;
 707         case 0x84 ... 0x87: /* GPMC_NAND_DATA */
 708             if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) {
 709                 omap_nand_write(f, 0, value, size);
 710             }
 711             break;
 712         default:
 713             goto bad_reg;
 714         }
 715         break;
 716
 717     case 0x1e0: /* GPMC_PREFETCH_CONFIG1 */
 718         if (!s->prefetch.startengine) {
 719             uint32_t oldconfig1 = s->prefetch.config1;
 720             uint32_t changed;
 721             s->prefetch.config1 = value & 0x7f8f7fbf;
 722             changed = oldconfig1 ^ s->prefetch.config1;
 723             if (changed & (0x80 | 0x7000000)) {
 724                 /* Turning the engine on or off, or mapping it somewhere else.
 725                  * cs_map() and cs_unmap() check the prefetch config and
 726                  * overall CSVALID bits, so it is sufficient to unmap-and-map
 727                  * both the old cs and the new one.
 728                  */
 729                 int oldcs = prefetch_cs(oldconfig1);
 730                 int newcs = prefetch_cs(s->prefetch.config1);
 731                 omap_gpmc_cs_unmap(s, oldcs);
 732                 omap_gpmc_cs_map(s, oldcs);
 733                 if (newcs != oldcs) {
 734                     omap_gpmc_cs_unmap(s, newcs);
 735                     omap_gpmc_cs_map(s, newcs);
 736                 }
 737             }
 738         }
 739         break;
 740
 741     case 0x1e4: /* GPMC_PREFETCH_CONFIG2 */
 742         if (!s->prefetch.startengine) {
 743             s->prefetch.transfercount = value & 0x3fff;
 744         }
 745         break;
 746
 747     case 0x1ec: /* GPMC_PREFETCH_CONTROL */
 748         if (s->prefetch.startengine != (value & 1)) {
 749             s->prefetch.startengine = value & 1;
 750             if (s->prefetch.startengine) {
 751                 /* Prefetch engine start */
 752                 s->prefetch.count = s->prefetch.transfercount;
 753                 if (s->prefetch.config1 & 1) {
 754                     /* Write */
 755                     s->prefetch.fifopointer = 64;
 756                 } else {
 757                     /* Read */
 758                     s->prefetch.fifopointer = 0;
 759                     fill_prefetch_fifo(s);
 760                 }
 761             } else {
 762                 /* Prefetch engine forcibly stopped. The TRM
 763                  * doesn't define the behaviour if you do this.
 764                  * We clear the prefetch count, which means that
 765                  * we permit no more writes, and don't read any
 766                  * more data from NAND. The CPU can still drain
 767                  * the FIFO of unread data.
 768                  */
 769                 s->prefetch.count = 0;
 770             }
 771             omap_gpmc_int_update(s);
 772         }
 773         break;
 774
 775     case 0x1f4: /* GPMC_ECC_CONFIG */
 776         s->ecc_cs = 0x8f;
 777         break;
 778     case 0x1f8: /* GPMC_ECC_CONTROL */
 779         if (value & (1 << 8))
 780             for (cs = 0; cs < 9; cs ++)
 781                 ecc_reset(&s->ecc[cs]);
 782         s->ecc_ptr = value & 0xf;
 783         if (s->ecc_ptr == 0 || s->ecc_ptr > 9) {
 784             s->ecc_ptr = 0;
 785             s->ecc_cs &= ~1;
 786         }
 787         break;
 788     case 0x1fc: /* GPMC_ECC_SIZE_CONFIG */
 789         s->ecc_cfg = value & 0x3fcff1ff;
 790         break;
 791     case 0x230: /* GPMC_TESTMODE_CTRL */
 792         if (value & 7)
 793             fprintf(stderr, "%s: test mode enable attempt\n", __FUNCTION__);
 794         break;
 795
 796     default:
 797     bad_reg:
 798         OMAP_BAD_REG(addr);
 799         return;
 800     }
 801 }
 802
 803 static const MemoryRegionOps omap_gpmc_ops = {
 804     .read = omap_gpmc_read,
 805     .write = omap_gpmc_write,
 806     .endianness = DEVICE_NATIVE_ENDIAN,
 807 };
 808
 809 struct omap_gpmc_s *omap_gpmc_init(struct omap_mpu_state_s *mpu,
 810                                    target_phys_addr_t base,
 811                                    qemu_irq irq, qemu_irq drq)
 812 {
 813     int cs;
 814     struct omap_gpmc_s *s = (struct omap_gpmc_s *)
 815             g_malloc0(sizeof(struct omap_gpmc_s));
 816
 817     memory_region_init_io(&s->iomem, &omap_gpmc_ops, s, "omap-gpmc", 0x1000);
 818     memory_region_add_subregion(get_system_memory(), base, &s->iomem);
 819
 820     s->irq = irq;
 821     s->drq = drq;
 822     s->accept_256 = cpu_is_omap3630(mpu);
 823     s->revision = cpu_class_omap3(mpu) ? 0x50 : 0x20;
 824     s->lastirq = 0;
 825     omap_gpmc_reset(s);
 826
 827     /* We have to register a different IO memory handler for each
 828      * chip select region in case a NAND device is mapped there. We
 829      * make the region the worst-case size of 256MB and rely on the
 830      * container memory region in cs_map to chop it down to the actual
 831      * guest-requested size.
 832      */
 833     for (cs = 0; cs < 8; cs++) {
 834         memory_region_init_io(&s->cs_file[cs].nandiomem,
 835                               &omap_nand_ops,
 836                               &s->cs_file[cs],
 837                               "omap-nand",
 838                               256 * 1024 * 1024);
 839     }
 840
 841     memory_region_init_io(&s->prefetch.iomem, &omap_prefetch_ops, s,
 842                           "omap-gpmc-prefetch", 256 * 1024 * 1024);
 843     return s;
 844 }
 845
 846 void omap_gpmc_attach(struct omap_gpmc_s *s, int cs, MemoryRegion *iomem)
 847 {
 848     struct omap_gpmc_cs_file_s *f;
 849     assert(iomem);
 850
 851     if (cs < 0 || cs >= 8) {
 852         fprintf(stderr, "%s: bad chip-select %i\n", __FUNCTION__, cs);
 853         exit(-1);
 854     }
 855     f = &s->cs_file[cs];
 856
 857     omap_gpmc_cs_unmap(s, cs);
 858     f->config[0] &= ~(0xf << 10);
 859     f->iomem = iomem;
 860     omap_gpmc_cs_map(s, cs);
 861 }
 862
 863 void omap_gpmc_attach_nand(struct omap_gpmc_s *s, int cs, DeviceState *nand)
 864 {
 865     struct omap_gpmc_cs_file_s *f;
 866     assert(nand);
 867
 868     if (cs < 0 || cs >= 8) {
 869         fprintf(stderr, "%s: bad chip-select %i\n", __func__, cs);
 870         exit(-1);
 871     }
 872     f = &s->cs_file[cs];
 873
 874     omap_gpmc_cs_unmap(s, cs);
 875     f->config[0] &= ~(0xf << 10);
 876     f->config[0] |= (OMAP_GPMC_NAND << 10);
 877     f->dev = nand;
 878     if (nand_getbuswidth(f->dev) == 16) {
 879         f->config[0] |= OMAP_GPMC_16BIT << 12;
 880     }
 881     omap_gpmc_cs_map(s, cs);
 882 }