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