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 #include "qdev.h"
  14
  15 struct PXA2xxMMCIState {
  16     qemu_irq irq;
  17     qemu_irq rx_dma;
  18     qemu_irq tx_dma;
  19
  20     SDState *card;
  21
  22     uint32_t status;
  23     uint32_t clkrt;
  24     uint32_t spi;
  25     uint32_t cmdat;
  26     uint32_t resp_tout;
  27     uint32_t read_tout;
  28     int blklen;
  29     int numblk;
  30     uint32_t intmask;
  31     uint32_t intreq;
  32     int cmd;
  33     uint32_t arg;
  34
  35     int active;
  36     int bytesleft;
  37     uint8_t tx_fifo[64];
  38     int tx_start;
  39     int tx_len;
  40     uint8_t rx_fifo[32];
  41     int rx_start;
  42     int rx_len;
  43     uint16_t resp_fifo[9];
  44     int resp_len;
  45
  46     int cmdreq;
  47     int ac_width;
  48 };
  49
  50 #define MMC_STRPCL      0x00    /* MMC Clock Start/Stop register */
  51 #define MMC_STAT        0x04    /* MMC Status register */
  52 #define MMC_CLKRT       0x08    /* MMC Clock Rate register */
  53 #define MMC_SPI         0x0c    /* MMC SPI Mode register */
  54 #define MMC_CMDAT       0x10    /* MMC Command/Data register */
  55 #define MMC_RESTO       0x14    /* MMC Response Time-Out register */
  56 #define MMC_RDTO        0x18    /* MMC Read Time-Out register */
  57 #define MMC_BLKLEN      0x1c    /* MMC Block Length register */
  58 #define MMC_NUMBLK      0x20    /* MMC Number of Blocks register */
  59 #define MMC_PRTBUF      0x24    /* MMC Buffer Partly Full register */
  60 #define MMC_I_MASK      0x28    /* MMC Interrupt Mask register */
  61 #define MMC_I_REG       0x2c    /* MMC Interrupt Request register */
  62 #define MMC_CMD         0x30    /* MMC Command register */
  63 #define MMC_ARGH        0x34    /* MMC Argument High register */
  64 #define MMC_ARGL        0x38    /* MMC Argument Low register */
  65 #define MMC_RES         0x3c    /* MMC Response FIFO */
  66 #define MMC_RXFIFO      0x40    /* MMC Receive FIFO */
  67 #define MMC_TXFIFO      0x44    /* MMC Transmit FIFO */
  68 #define MMC_RDWAIT      0x48    /* MMC RD_WAIT register */
  69 #define MMC_BLKS_REM    0x4c    /* MMC Blocks Remaining register */
  70
  71 /* Bitfield masks */
  72 #define STRPCL_STOP_CLK (1 << 0)
  73 #define STRPCL_STRT_CLK (1 << 1)
  74 #define STAT_TOUT_RES   (1 << 1)
  75 #define STAT_CLK_EN     (1 << 8)
  76 #define STAT_DATA_DONE  (1 << 11)
  77 #define STAT_PRG_DONE   (1 << 12)
  78 #define STAT_END_CMDRES (1 << 13)
  79 #define SPI_SPI_MODE    (1 << 0)
  80 #define CMDAT_RES_TYPE  (3 << 0)
  81 #define CMDAT_DATA_EN   (1 << 2)
  82 #define CMDAT_WR_RD     (1 << 3)
  83 #define CMDAT_DMA_EN    (1 << 7)
  84 #define CMDAT_STOP_TRAN (1 << 10)
  85 #define INT_DATA_DONE   (1 << 0)
  86 #define INT_PRG_DONE    (1 << 1)
  87 #define INT_END_CMD     (1 << 2)
  88 #define INT_STOP_CMD    (1 << 3)
  89 #define INT_CLK_OFF     (1 << 4)
  90 #define INT_RXFIFO_REQ  (1 << 5)
  91 #define INT_TXFIFO_REQ  (1 << 6)
  92 #define INT_TINT        (1 << 7)
  93 #define INT_DAT_ERR     (1 << 8)
  94 #define INT_RES_ERR     (1 << 9)
  95 #define INT_RD_STALLED  (1 << 10)
  96 #define INT_SDIO_INT    (1 << 11)
  97 #define INT_SDIO_SACK   (1 << 12)
  98 #define PRTBUF_PRT_BUF  (1 << 0)
  99
 100 /* Route internal interrupt lines to the global IC and DMA */
 101 static void pxa2xx_mmci_int_update(PXA2xxMMCIState *s)
 102 {
 103     uint32_t mask = s->intmask;
 104     if (s->cmdat & CMDAT_DMA_EN) {
 105         mask |= INT_RXFIFO_REQ | INT_TXFIFO_REQ;
 106
 107         qemu_set_irq(s->rx_dma, !!(s->intreq & INT_RXFIFO_REQ));
 108         qemu_set_irq(s->tx_dma, !!(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(PXA2xxMMCIState *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(PXA2xxMMCIState *s)
 151 {
 152     int rsplen, i;
 153     SDRequest 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     PXA2xxMMCIState *s = (PXA2xxMMCIState *) 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         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 270     }
 271
 272     return 0;
 273 }
 274
 275 static void pxa2xx_mmci_write(void *opaque,
 276                 target_phys_addr_t offset, uint32_t value)
 277 {
 278     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 279
 280     switch (offset) {
 281     case MMC_STRPCL:
 282         if (value & STRPCL_STRT_CLK) {
 283             s->status |= STAT_CLK_EN;
 284             s->intreq &= ~INT_CLK_OFF;
 285
 286             if (s->cmdreq && !(s->cmdat & CMDAT_STOP_TRAN)) {
 287                 s->status &= STAT_CLK_EN;
 288                 pxa2xx_mmci_wakequeues(s);
 289             }
 290         }
 291
 292         if (value & STRPCL_STOP_CLK) {
 293             s->status &= ~STAT_CLK_EN;
 294             s->intreq |= INT_CLK_OFF;
 295             s->active = 0;
 296         }
 297
 298         pxa2xx_mmci_int_update(s);
 299         break;
 300
 301     case MMC_CLKRT:
 302         s->clkrt = value & 7;
 303         break;
 304
 305     case MMC_SPI:
 306         s->spi = value & 0xf;
 307         if (value & SPI_SPI_MODE)
 308             printf("%s: attempted to use card in SPI mode\n", __FUNCTION__);
 309         break;
 310
 311     case MMC_CMDAT:
 312         s->cmdat = value & 0x3dff;
 313         s->active = 0;
 314         s->cmdreq = 1;
 315         if (!(value & CMDAT_STOP_TRAN)) {
 316             s->status &= STAT_CLK_EN;
 317
 318             if (s->status & STAT_CLK_EN)
 319                 pxa2xx_mmci_wakequeues(s);
 320         }
 321
 322         pxa2xx_mmci_int_update(s);
 323         break;
 324
 325     case MMC_RESTO:
 326         s->resp_tout = value & 0x7f;
 327         break;
 328
 329     case MMC_RDTO:
 330         s->read_tout = value & 0xffff;
 331         break;
 332
 333     case MMC_BLKLEN:
 334         s->blklen = value & 0xfff;
 335         break;
 336
 337     case MMC_NUMBLK:
 338         s->numblk = value & 0xffff;
 339         break;
 340
 341     case MMC_PRTBUF:
 342         if (value & PRTBUF_PRT_BUF) {
 343             s->tx_start ^= 32;
 344             s->tx_len = 0;
 345         }
 346         pxa2xx_mmci_fifo_update(s);
 347         break;
 348
 349     case MMC_I_MASK:
 350         s->intmask = value & 0x1fff;
 351         pxa2xx_mmci_int_update(s);
 352         break;
 353
 354     case MMC_CMD:
 355         s->cmd = value & 0x3f;
 356         break;
 357
 358     case MMC_ARGH:
 359         s->arg &= 0x0000ffff;
 360         s->arg |= value << 16;
 361         break;
 362
 363     case MMC_ARGL:
 364         s->arg &= 0xffff0000;
 365         s->arg |= value & 0x0000ffff;
 366         break;
 367
 368     case MMC_TXFIFO:
 369         while (s->ac_width -- && s->tx_len < 0x20)
 370             s->tx_fifo[(s->tx_start + (s->tx_len ++)) & 0x1f] =
 371                     (value >> (s->ac_width << 3)) & 0xff;
 372         s->intreq &= ~INT_TXFIFO_REQ;
 373         pxa2xx_mmci_fifo_update(s);
 374         break;
 375
 376     case MMC_RDWAIT:
 377     case MMC_BLKS_REM:
 378         break;
 379
 380     default:
 381         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 382     }
 383 }
 384
 385 static uint32_t pxa2xx_mmci_readb(void *opaque, target_phys_addr_t offset)
 386 {
 387     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 388     s->ac_width = 1;
 389     return pxa2xx_mmci_read(opaque, offset);
 390 }
 391
 392 static uint32_t pxa2xx_mmci_readh(void *opaque, target_phys_addr_t offset)
 393 {
 394     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 395     s->ac_width = 2;
 396     return pxa2xx_mmci_read(opaque, offset);
 397 }
 398
 399 static uint32_t pxa2xx_mmci_readw(void *opaque, target_phys_addr_t offset)
 400 {
 401     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 402     s->ac_width = 4;
 403     return pxa2xx_mmci_read(opaque, offset);
 404 }
 405
 406 static CPUReadMemoryFunc * const pxa2xx_mmci_readfn[] = {
 407     pxa2xx_mmci_readb,
 408     pxa2xx_mmci_readh,
 409     pxa2xx_mmci_readw
 410 };
 411
 412 static void pxa2xx_mmci_writeb(void *opaque,
 413                 target_phys_addr_t offset, uint32_t value)
 414 {
 415     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 416     s->ac_width = 1;
 417     pxa2xx_mmci_write(opaque, offset, value);
 418 }
 419
 420 static void pxa2xx_mmci_writeh(void *opaque,
 421                 target_phys_addr_t offset, uint32_t value)
 422 {
 423     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 424     s->ac_width = 2;
 425     pxa2xx_mmci_write(opaque, offset, value);
 426 }
 427
 428 static void pxa2xx_mmci_writew(void *opaque,
 429                 target_phys_addr_t offset, uint32_t value)
 430 {
 431     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 432     s->ac_width = 4;
 433     pxa2xx_mmci_write(opaque, offset, value);
 434 }
 435
 436 static CPUWriteMemoryFunc * const pxa2xx_mmci_writefn[] = {
 437     pxa2xx_mmci_writeb,
 438     pxa2xx_mmci_writeh,
 439     pxa2xx_mmci_writew
 440 };
 441
 442 static void pxa2xx_mmci_save(QEMUFile *f, void *opaque)
 443 {
 444     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 445     int i;
 446
 447     qemu_put_be32s(f, &s->status);
 448     qemu_put_be32s(f, &s->clkrt);
 449     qemu_put_be32s(f, &s->spi);
 450     qemu_put_be32s(f, &s->cmdat);
 451     qemu_put_be32s(f, &s->resp_tout);
 452     qemu_put_be32s(f, &s->read_tout);
 453     qemu_put_be32(f, s->blklen);
 454     qemu_put_be32(f, s->numblk);
 455     qemu_put_be32s(f, &s->intmask);
 456     qemu_put_be32s(f, &s->intreq);
 457     qemu_put_be32(f, s->cmd);
 458     qemu_put_be32s(f, &s->arg);
 459     qemu_put_be32(f, s->cmdreq);
 460     qemu_put_be32(f, s->active);
 461     qemu_put_be32(f, s->bytesleft);
 462
 463     qemu_put_byte(f, s->tx_len);
 464     for (i = 0; i < s->tx_len; i ++)
 465         qemu_put_byte(f, s->tx_fifo[(s->tx_start + i) & 63]);
 466
 467     qemu_put_byte(f, s->rx_len);
 468     for (i = 0; i < s->rx_len; i ++)
 469         qemu_put_byte(f, s->rx_fifo[(s->rx_start + i) & 31]);
 470
 471     qemu_put_byte(f, s->resp_len);
 472     for (i = s->resp_len; i < 9; i ++)
 473         qemu_put_be16s(f, &s->resp_fifo[i]);
 474 }
 475
 476 static int pxa2xx_mmci_load(QEMUFile *f, void *opaque, int version_id)
 477 {
 478     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 479     int i;
 480
 481     qemu_get_be32s(f, &s->status);
 482     qemu_get_be32s(f, &s->clkrt);
 483     qemu_get_be32s(f, &s->spi);
 484     qemu_get_be32s(f, &s->cmdat);
 485     qemu_get_be32s(f, &s->resp_tout);
 486     qemu_get_be32s(f, &s->read_tout);
 487     s->blklen = qemu_get_be32(f);
 488     s->numblk = qemu_get_be32(f);
 489     qemu_get_be32s(f, &s->intmask);
 490     qemu_get_be32s(f, &s->intreq);
 491     s->cmd = qemu_get_be32(f);
 492     qemu_get_be32s(f, &s->arg);
 493     s->cmdreq = qemu_get_be32(f);
 494     s->active = qemu_get_be32(f);
 495     s->bytesleft = qemu_get_be32(f);
 496
 497     s->tx_len = qemu_get_byte(f);
 498     s->tx_start = 0;
 499     if (s->tx_len >= sizeof(s->tx_fifo) || s->tx_len < 0)
 500         return -EINVAL;
 501     for (i = 0; i < s->tx_len; i ++)
 502         s->tx_fifo[i] = qemu_get_byte(f);
 503
 504     s->rx_len = qemu_get_byte(f);
 505     s->rx_start = 0;
 506     if (s->rx_len >= sizeof(s->rx_fifo) || s->rx_len < 0)
 507         return -EINVAL;
 508     for (i = 0; i < s->rx_len; i ++)
 509         s->rx_fifo[i] = qemu_get_byte(f);
 510
 511     s->resp_len = qemu_get_byte(f);
 512     if (s->resp_len > 9 || s->resp_len < 0)
 513         return -EINVAL;
 514     for (i = s->resp_len; i < 9; i ++)
 515          qemu_get_be16s(f, &s->resp_fifo[i]);
 516
 517     return 0;
 518 }
 519
 520 PXA2xxMMCIState *pxa2xx_mmci_init(target_phys_addr_t base,
 521                 BlockDriverState *bd, qemu_irq irq,
 522                 qemu_irq rx_dma, qemu_irq tx_dma)
 523 {
 524     int iomemtype;
 525     PXA2xxMMCIState *s;
 526
 527     s = (PXA2xxMMCIState *) qemu_mallocz(sizeof(PXA2xxMMCIState));
 528     s->irq = irq;
 529     s->rx_dma = rx_dma;
 530     s->tx_dma = tx_dma;
 531
 532     iomemtype = cpu_register_io_memory(pxa2xx_mmci_readfn,
 533                     pxa2xx_mmci_writefn, s, DEVICE_NATIVE_ENDIAN);
 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(NULL, "pxa2xx_mmci", 0, 0,
 540                     pxa2xx_mmci_save, pxa2xx_mmci_load, s);
 541
 542     return s;
 543 }
 544
 545 void pxa2xx_mmci_handlers(PXA2xxMMCIState *s, qemu_irq readonly,
 546                 qemu_irq coverswitch)
 547 {
 548     sd_set_cb(s->card, readonly, coverswitch);
 549 }