hw/pxa2xx_mmci.c

   1 /*
   2  * Intel XScale PXA255/270 MultiMediaCard/SD/SDIO Controller emulation.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Written by Andrzej Zaborowski <balrog@zabor.org>
   6  *
   7  * This code is licensed under the GPLv2.
   8  */
   9
  10 #include "hw.h"
  11 #include "pxa.h"
  12 #include "sd.h"
  13
  14 struct pxa2xx_mmci_s {
  15     qemu_irq irq;
  16     void *dma;
  17
  18     SDState *card;
  19
  20     uint32_t status;
  21     uint32_t clkrt;
  22     uint32_t spi;
  23     uint32_t cmdat;
  24     uint32_t resp_tout;
  25     uint32_t read_tout;
  26     int blklen;
  27     int numblk;
  28     uint32_t intmask;
  29     uint32_t intreq;
  30     int cmd;
  31     uint32_t arg;
  32
  33     int active;
  34     int bytesleft;
  35     uint8_t tx_fifo[64];
  36     int tx_start;
  37     int tx_len;
  38     uint8_t rx_fifo[32];
  39     int rx_start;
  40     int rx_len;
  41     uint16_t resp_fifo[9];
  42     int resp_len;
  43
  44     int cmdreq;
  45     int ac_width;
  46 };
  47
  48 #define MMC_STRPCL      0x00    /* MMC Clock Start/Stop register */
  49 #define MMC_STAT        0x04    /* MMC Status register */
  50 #define MMC_CLKRT       0x08    /* MMC Clock Rate register */
  51 #define MMC_SPI         0x0c    /* MMC SPI Mode register */
  52 #define MMC_CMDAT       0x10    /* MMC Command/Data register */
  53 #define MMC_RESTO       0x14    /* MMC Response Time-Out register */
  54 #define MMC_RDTO        0x18    /* MMC Read Time-Out register */
  55 #define MMC_BLKLEN      0x1c    /* MMC Block Length register */
  56 #define MMC_NUMBLK      0x20    /* MMC Number of Blocks register */
  57 #define MMC_PRTBUF      0x24    /* MMC Buffer Partly Full register */
  58 #define MMC_I_MASK      0x28    /* MMC Interrupt Mask register */
  59 #define MMC_I_REG       0x2c    /* MMC Interrupt Request register */
  60 #define MMC_CMD         0x30    /* MMC Command register */
  61 #define MMC_ARGH        0x34    /* MMC Argument High register */
  62 #define MMC_ARGL        0x38    /* MMC Argument Low register */
  63 #define MMC_RES         0x3c    /* MMC Response FIFO */
  64 #define MMC_RXFIFO      0x40    /* MMC Receive FIFO */
  65 #define MMC_TXFIFO      0x44    /* MMC Transmit FIFO */
  66 #define MMC_RDWAIT      0x48    /* MMC RD_WAIT register */
  67 #define MMC_BLKS_REM    0x4c    /* MMC Blocks Remaining register */
  68
  69 /* Bitfield masks */
  70 #define STRPCL_STOP_CLK (1 << 0)
  71 #define STRPCL_STRT_CLK (1 << 1)
  72 #define STAT_TOUT_RES   (1 << 1)
  73 #define STAT_CLK_EN     (1 << 8)
  74 #define STAT_DATA_DONE  (1 << 11)
  75 #define STAT_PRG_DONE   (1 << 12)
  76 #define STAT_END_CMDRES (1 << 13)
  77 #define SPI_SPI_MODE    (1 << 0)
  78 #define CMDAT_RES_TYPE  (3 << 0)
  79 #define CMDAT_DATA_EN   (1 << 2)
  80 #define CMDAT_WR_RD     (1 << 3)
  81 #define CMDAT_DMA_EN    (1 << 7)
  82 #define CMDAT_STOP_TRAN (1 << 10)
  83 #define INT_DATA_DONE   (1 << 0)
  84 #define INT_PRG_DONE    (1 << 1)
  85 #define INT_END_CMD     (1 << 2)
  86 #define INT_STOP_CMD    (1 << 3)
  87 #define INT_CLK_OFF     (1 << 4)
  88 #define INT_RXFIFO_REQ  (1 << 5)
  89 #define INT_TXFIFO_REQ  (1 << 6)
  90 #define INT_TINT        (1 << 7)
  91 #define INT_DAT_ERR     (1 << 8)
  92 #define INT_RES_ERR     (1 << 9)
  93 #define INT_RD_STALLED  (1 << 10)
  94 #define INT_SDIO_INT    (1 << 11)
  95 #define INT_SDIO_SACK   (1 << 12)
  96 #define PRTBUF_PRT_BUF  (1 << 0)
  97
  98 /* Route internal interrupt lines to the global IC and DMA */
  99 static void pxa2xx_mmci_int_update(struct pxa2xx_mmci_s *s)
 100 {
 101     uint32_t mask = s->intmask;
 102     if (s->cmdat & CMDAT_DMA_EN) {
 103         mask |= INT_RXFIFO_REQ | INT_TXFIFO_REQ;
 104
 105         pxa2xx_dma_request((struct pxa2xx_dma_state_s *) s->dma,
 106                         PXA2XX_RX_RQ_MMCI, !!(s->intreq & INT_RXFIFO_REQ));
 107         pxa2xx_dma_request((struct pxa2xx_dma_state_s *) s->dma,
 108                         PXA2XX_TX_RQ_MMCI, !!(s->intreq & INT_TXFIFO_REQ));
 109     }
 110
 111     qemu_set_irq(s->irq, !!(s->intreq & ~mask));
 112 }
 113
 114 static void pxa2xx_mmci_fifo_update(struct pxa2xx_mmci_s *s)
 115 {
 116     if (!s->active)
 117         return;
 118
 119     if (s->cmdat & CMDAT_WR_RD) {
 120         while (s->bytesleft && s->tx_len) {
 121             sd_write_data(s->card, s->tx_fifo[s->tx_start ++]);
 122             s->tx_start &= 0x1f;
 123             s->tx_len --;
 124             s->bytesleft --;
 125         }
 126         if (s->bytesleft)
 127             s->intreq |= INT_TXFIFO_REQ;
 128     } else
 129         while (s->bytesleft && s->rx_len < 32) {
 130             s->rx_fifo[(s->rx_start + (s->rx_len ++)) & 0x1f] =
 131                 sd_read_data(s->card);
 132             s->bytesleft --;
 133             s->intreq |= INT_RXFIFO_REQ;
 134         }
 135
 136     if (!s->bytesleft) {
 137         s->active = 0;
 138         s->intreq |= INT_DATA_DONE;
 139         s->status |= STAT_DATA_DONE;
 140
 141         if (s->cmdat & CMDAT_WR_RD) {
 142             s->intreq |= INT_PRG_DONE;
 143             s->status |= STAT_PRG_DONE;
 144         }
 145     }
 146
 147     pxa2xx_mmci_int_update(s);
 148 }
 149
 150 static void pxa2xx_mmci_wakequeues(struct pxa2xx_mmci_s *s)
 151 {
 152     int rsplen, i;
 153     struct sd_request_s request;
 154     uint8_t response[16];
 155
 156     s->active = 1;
 157     s->rx_len = 0;
 158     s->tx_len = 0;
 159     s->cmdreq = 0;
 160
 161     request.cmd = s->cmd;
 162     request.arg = s->arg;
 163     request.crc = 0;    /* FIXME */
 164
 165     rsplen = sd_do_command(s->card, &request, response);
 166     s->intreq |= INT_END_CMD;
 167
 168     memset(s->resp_fifo, 0, sizeof(s->resp_fifo));
 169     switch (s->cmdat & CMDAT_RES_TYPE) {
 170 #define PXAMMCI_RESP(wd, value0, value1)        \
 171         s->resp_fifo[(wd) + 0] |= (value0);     \
 172         s->resp_fifo[(wd) + 1] |= (value1) << 8;
 173     case 0:     /* No response */
 174         goto complete;
 175
 176     case 1:     /* R1, R4, R5 or R6 */
 177         if (rsplen < 4)
 178             goto timeout;
 179         goto complete;
 180
 181     case 2:     /* R2 */
 182         if (rsplen < 16)
 183             goto timeout;
 184         goto complete;
 185
 186     case 3:     /* R3 */
 187         if (rsplen < 4)
 188             goto timeout;
 189         goto complete;
 190
 191     complete:
 192         for (i = 0; rsplen > 0; i ++, rsplen -= 2) {
 193             PXAMMCI_RESP(i, response[i * 2], response[i * 2 + 1]);
 194         }
 195         s->status |= STAT_END_CMDRES;
 196
 197         if (!(s->cmdat & CMDAT_DATA_EN))
 198             s->active = 0;
 199         else
 200             s->bytesleft = s->numblk * s->blklen;
 201
 202         s->resp_len = 0;
 203         break;
 204
 205     timeout:
 206         s->active = 0;
 207         s->status |= STAT_TOUT_RES;
 208         break;
 209     }
 210
 211     pxa2xx_mmci_fifo_update(s);
 212 }
 213
 214 static uint32_t pxa2xx_mmci_read(void *opaque, target_phys_addr_t offset)
 215 {
 216     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 217     uint32_t ret;
 218
 219     switch (offset) {
 220     case MMC_STRPCL:
 221         return 0;
 222     case MMC_STAT:
 223         return s->status;
 224     case MMC_CLKRT:
 225         return s->clkrt;
 226     case MMC_SPI:
 227         return s->spi;
 228     case MMC_CMDAT:
 229         return s->cmdat;
 230     case MMC_RESTO:
 231         return s->resp_tout;
 232     case MMC_RDTO:
 233         return s->read_tout;
 234     case MMC_BLKLEN:
 235         return s->blklen;
 236     case MMC_NUMBLK:
 237         return s->numblk;
 238     case MMC_PRTBUF:
 239         return 0;
 240     case MMC_I_MASK:
 241         return s->intmask;
 242     case MMC_I_REG:
 243         return s->intreq;
 244     case MMC_CMD:
 245         return s->cmd | 0x40;
 246     case MMC_ARGH:
 247         return s->arg >> 16;
 248     case MMC_ARGL:
 249         return s->arg & 0xffff;
 250     case MMC_RES:
 251         if (s->resp_len < 9)
 252             return s->resp_fifo[s->resp_len ++];
 253         return 0;
 254     case MMC_RXFIFO:
 255         ret = 0;
 256         while (s->ac_width -- && s->rx_len) {
 257             ret |= s->rx_fifo[s->rx_start ++] << (s->ac_width << 3);
 258             s->rx_start &= 0x1f;
 259             s->rx_len --;
 260         }
 261         s->intreq &= ~INT_RXFIFO_REQ;
 262         pxa2xx_mmci_fifo_update(s);
 263         return ret;
 264     case MMC_RDWAIT:
 265         return 0;
 266     case MMC_BLKS_REM:
 267         return s->numblk;
 268     default:
 269         cpu_abort(cpu_single_env, "%s: Bad offset " REG_FMT "\n",
 270                         __FUNCTION__, offset);
 271     }
 272
 273     return 0;
 274 }
 275
 276 static void pxa2xx_mmci_write(void *opaque,
 277                 target_phys_addr_t offset, uint32_t value)
 278 {
 279     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 280
 281     switch (offset) {
 282     case MMC_STRPCL:
 283         if (value & STRPCL_STRT_CLK) {
 284             s->status |= STAT_CLK_EN;
 285             s->intreq &= ~INT_CLK_OFF;
 286
 287             if (s->cmdreq && !(s->cmdat & CMDAT_STOP_TRAN)) {
 288                 s->status &= STAT_CLK_EN;
 289                 pxa2xx_mmci_wakequeues(s);
 290             }
 291         }
 292
 293         if (value & STRPCL_STOP_CLK) {
 294             s->status &= ~STAT_CLK_EN;
 295             s->intreq |= INT_CLK_OFF;
 296             s->active = 0;
 297         }
 298
 299         pxa2xx_mmci_int_update(s);
 300         break;
 301
 302     case MMC_CLKRT:
 303         s->clkrt = value & 7;
 304         break;
 305
 306     case MMC_SPI:
 307         s->spi = value & 0xf;
 308         if (value & SPI_SPI_MODE)
 309             printf("%s: attempted to use card in SPI mode\n", __FUNCTION__);
 310         break;
 311
 312     case MMC_CMDAT:
 313         s->cmdat = value & 0x3dff;
 314         s->active = 0;
 315         s->cmdreq = 1;
 316         if (!(value & CMDAT_STOP_TRAN)) {
 317             s->status &= STAT_CLK_EN;
 318
 319             if (s->status & STAT_CLK_EN)
 320                 pxa2xx_mmci_wakequeues(s);
 321         }
 322
 323         pxa2xx_mmci_int_update(s);
 324         break;
 325
 326     case MMC_RESTO:
 327         s->resp_tout = value & 0x7f;
 328         break;
 329
 330     case MMC_RDTO:
 331         s->read_tout = value & 0xffff;
 332         break;
 333
 334     case MMC_BLKLEN:
 335         s->blklen = value & 0xfff;
 336         break;
 337
 338     case MMC_NUMBLK:
 339         s->numblk = value & 0xffff;
 340         break;
 341
 342     case MMC_PRTBUF:
 343         if (value & PRTBUF_PRT_BUF) {
 344             s->tx_start ^= 32;
 345             s->tx_len = 0;
 346         }
 347         pxa2xx_mmci_fifo_update(s);
 348         break;
 349
 350     case MMC_I_MASK:
 351         s->intmask = value & 0x1fff;
 352         pxa2xx_mmci_int_update(s);
 353         break;
 354
 355     case MMC_CMD:
 356         s->cmd = value & 0x3f;
 357         break;
 358
 359     case MMC_ARGH:
 360         s->arg &= 0x0000ffff;
 361         s->arg |= value << 16;
 362         break;
 363
 364     case MMC_ARGL:
 365         s->arg &= 0xffff0000;
 366         s->arg |= value & 0x0000ffff;
 367         break;
 368
 369     case MMC_TXFIFO:
 370         while (s->ac_width -- && s->tx_len < 0x20)
 371             s->tx_fifo[(s->tx_start + (s->tx_len ++)) & 0x1f] =
 372                     (value >> (s->ac_width << 3)) & 0xff;
 373         s->intreq &= ~INT_TXFIFO_REQ;
 374         pxa2xx_mmci_fifo_update(s);
 375         break;
 376
 377     case MMC_RDWAIT:
 378     case MMC_BLKS_REM:
 379         break;
 380
 381     default:
 382         cpu_abort(cpu_single_env, "%s: Bad offset " REG_FMT "\n",
 383                         __FUNCTION__, offset);
 384     }
 385 }
 386
 387 static uint32_t pxa2xx_mmci_readb(void *opaque, target_phys_addr_t offset)
 388 {
 389     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 390     s->ac_width = 1;
 391     return pxa2xx_mmci_read(opaque, offset);
 392 }
 393
 394 static uint32_t pxa2xx_mmci_readh(void *opaque, target_phys_addr_t offset)
 395 {
 396     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 397     s->ac_width = 2;
 398     return pxa2xx_mmci_read(opaque, offset);
 399 }
 400
 401 static uint32_t pxa2xx_mmci_readw(void *opaque, target_phys_addr_t offset)
 402 {
 403     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 404     s->ac_width = 4;
 405     return pxa2xx_mmci_read(opaque, offset);
 406 }
 407
 408 static CPUReadMemoryFunc *pxa2xx_mmci_readfn[] = {
 409     pxa2xx_mmci_readb,
 410     pxa2xx_mmci_readh,
 411     pxa2xx_mmci_readw
 412 };
 413
 414 static void pxa2xx_mmci_writeb(void *opaque,
 415                 target_phys_addr_t offset, uint32_t value)
 416 {
 417     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 418     s->ac_width = 1;
 419     pxa2xx_mmci_write(opaque, offset, value);
 420 }
 421
 422 static void pxa2xx_mmci_writeh(void *opaque,
 423                 target_phys_addr_t offset, uint32_t value)
 424 {
 425     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 426     s->ac_width = 2;
 427     pxa2xx_mmci_write(opaque, offset, value);
 428 }
 429
 430 static void pxa2xx_mmci_writew(void *opaque,
 431                 target_phys_addr_t offset, uint32_t value)
 432 {
 433     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 434     s->ac_width = 4;
 435     pxa2xx_mmci_write(opaque, offset, value);
 436 }
 437
 438 static CPUWriteMemoryFunc *pxa2xx_mmci_writefn[] = {
 439     pxa2xx_mmci_writeb,
 440     pxa2xx_mmci_writeh,
 441     pxa2xx_mmci_writew
 442 };
 443
 444 static void pxa2xx_mmci_save(QEMUFile *f, void *opaque)
 445 {
 446     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 447     int i;
 448
 449     qemu_put_be32s(f, &s->status);
 450     qemu_put_be32s(f, &s->clkrt);
 451     qemu_put_be32s(f, &s->spi);
 452     qemu_put_be32s(f, &s->cmdat);
 453     qemu_put_be32s(f, &s->resp_tout);
 454     qemu_put_be32s(f, &s->read_tout);
 455     qemu_put_be32(f, s->blklen);
 456     qemu_put_be32(f, s->numblk);
 457     qemu_put_be32s(f, &s->intmask);
 458     qemu_put_be32s(f, &s->intreq);
 459     qemu_put_be32(f, s->cmd);
 460     qemu_put_be32s(f, &s->arg);
 461     qemu_put_be32(f, s->cmdreq);
 462     qemu_put_be32(f, s->active);
 463     qemu_put_be32(f, s->bytesleft);
 464
 465     qemu_put_byte(f, s->tx_len);
 466     for (i = 0; i < s->tx_len; i ++)
 467         qemu_put_byte(f, s->tx_fifo[(s->tx_start + i) & 63]);
 468
 469     qemu_put_byte(f, s->rx_len);
 470     for (i = 0; i < s->rx_len; i ++)
 471         qemu_put_byte(f, s->rx_fifo[(s->rx_start + i) & 31]);
 472
 473     qemu_put_byte(f, s->resp_len);
 474     for (i = s->resp_len; i < 9; i ++)
 475         qemu_put_be16s(f, &s->resp_fifo[i]);
 476 }
 477
 478 static int pxa2xx_mmci_load(QEMUFile *f, void *opaque, int version_id)
 479 {
 480     struct pxa2xx_mmci_s *s = (struct pxa2xx_mmci_s *) opaque;
 481     int i;
 482
 483     qemu_get_be32s(f, &s->status);
 484     qemu_get_be32s(f, &s->clkrt);
 485     qemu_get_be32s(f, &s->spi);
 486     qemu_get_be32s(f, &s->cmdat);
 487     qemu_get_be32s(f, &s->resp_tout);
 488     qemu_get_be32s(f, &s->read_tout);
 489     s->blklen = qemu_get_be32(f);
 490     s->numblk = qemu_get_be32(f);
 491     qemu_get_be32s(f, &s->intmask);
 492     qemu_get_be32s(f, &s->intreq);
 493     s->cmd = qemu_get_be32(f);
 494     qemu_get_be32s(f, &s->arg);
 495     s->cmdreq = qemu_get_be32(f);
 496     s->active = qemu_get_be32(f);
 497     s->bytesleft = qemu_get_be32(f);
 498
 499     s->tx_len = qemu_get_byte(f);
 500     s->tx_start = 0;
 501     if (s->tx_len >= sizeof(s->tx_fifo) || s->tx_len < 0)
 502         return -EINVAL;
 503     for (i = 0; i < s->tx_len; i ++)
 504         s->tx_fifo[i] = qemu_get_byte(f);
 505
 506     s->rx_len = qemu_get_byte(f);
 507     s->rx_start = 0;
 508     if (s->rx_len >= sizeof(s->rx_fifo) || s->rx_len < 0)
 509         return -EINVAL;
 510     for (i = 0; i < s->rx_len; i ++)
 511         s->rx_fifo[i] = qemu_get_byte(f);
 512
 513     s->resp_len = qemu_get_byte(f);
 514     if (s->resp_len > 9 || s->resp_len < 0)
 515         return -EINVAL;
 516     for (i = s->resp_len; i < 9; i ++)
 517          qemu_get_be16s(f, &s->resp_fifo[i]);
 518
 519     return 0;
 520 }
 521
 522 struct pxa2xx_mmci_s *pxa2xx_mmci_init(target_phys_addr_t base,
 523                 BlockDriverState *bd, qemu_irq irq, void *dma)
 524 {
 525     int iomemtype;
 526     struct pxa2xx_mmci_s *s;
 527
 528     s = (struct pxa2xx_mmci_s *) qemu_mallocz(sizeof(struct pxa2xx_mmci_s));
 529     s->irq = irq;
 530     s->dma = dma;
 531
 532     iomemtype = cpu_register_io_memory(0, pxa2xx_mmci_readfn,
 533                     pxa2xx_mmci_writefn, s);
 534     cpu_register_physical_memory(base, 0x00100000, iomemtype);
 535
 536     /* Instantiate the actual storage */
 537     s->card = sd_init(bd, 0);
 538
 539     register_savevm("pxa2xx_mmci", 0, 0,
 540                     pxa2xx_mmci_save, pxa2xx_mmci_load, s);
 541
 542     return s;
 543 }
 544
 545 void pxa2xx_mmci_handlers(struct pxa2xx_mmci_s *s, qemu_irq readonly,
 546                 qemu_irq coverswitch)
 547 {
 548     sd_set_cb(s->card, readonly, coverswitch);
 549 }