hw/sd/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  * Contributions after 2012-01-13 are licensed under the terms of the
  10  * GNU GPL, version 2 or (at your option) any later version.
  11  */
  12
  13 #include "hw/hw.h"
  14 #include "hw/arm/pxa.h"
  15 #include "hw/sd.h"
  16 #include "hw/qdev.h"
  17
  18 struct PXA2xxMMCIState {
  19     MemoryRegion iomem;
  20     qemu_irq irq;
  21     qemu_irq rx_dma;
  22     qemu_irq tx_dma;
  23
  24     SDState *card;
  25
  26     uint32_t status;
  27     uint32_t clkrt;
  28     uint32_t spi;
  29     uint32_t cmdat;
  30     uint32_t resp_tout;
  31     uint32_t read_tout;
  32     int blklen;
  33     int numblk;
  34     uint32_t intmask;
  35     uint32_t intreq;
  36     int cmd;
  37     uint32_t arg;
  38
  39     int active;
  40     int bytesleft;
  41     uint8_t tx_fifo[64];
  42     int tx_start;
  43     int tx_len;
  44     uint8_t rx_fifo[32];
  45     int rx_start;
  46     int rx_len;
  47     uint16_t resp_fifo[9];
  48     int resp_len;
  49
  50     int cmdreq;
  51     int ac_width;
  52 };
  53
  54 #define MMC_STRPCL      0x00    /* MMC Clock Start/Stop register */
  55 #define MMC_STAT        0x04    /* MMC Status register */
  56 #define MMC_CLKRT       0x08    /* MMC Clock Rate register */
  57 #define MMC_SPI         0x0c    /* MMC SPI Mode register */
  58 #define MMC_CMDAT       0x10    /* MMC Command/Data register */
  59 #define MMC_RESTO       0x14    /* MMC Response Time-Out register */
  60 #define MMC_RDTO        0x18    /* MMC Read Time-Out register */
  61 #define MMC_BLKLEN      0x1c    /* MMC Block Length register */
  62 #define MMC_NUMBLK      0x20    /* MMC Number of Blocks register */
  63 #define MMC_PRTBUF      0x24    /* MMC Buffer Partly Full register */
  64 #define MMC_I_MASK      0x28    /* MMC Interrupt Mask register */
  65 #define MMC_I_REG       0x2c    /* MMC Interrupt Request register */
  66 #define MMC_CMD         0x30    /* MMC Command register */
  67 #define MMC_ARGH        0x34    /* MMC Argument High register */
  68 #define MMC_ARGL        0x38    /* MMC Argument Low register */
  69 #define MMC_RES         0x3c    /* MMC Response FIFO */
  70 #define MMC_RXFIFO      0x40    /* MMC Receive FIFO */
  71 #define MMC_TXFIFO      0x44    /* MMC Transmit FIFO */
  72 #define MMC_RDWAIT      0x48    /* MMC RD_WAIT register */
  73 #define MMC_BLKS_REM    0x4c    /* MMC Blocks Remaining register */
  74
  75 /* Bitfield masks */
  76 #define STRPCL_STOP_CLK (1 << 0)
  77 #define STRPCL_STRT_CLK (1 << 1)
  78 #define STAT_TOUT_RES   (1 << 1)
  79 #define STAT_CLK_EN     (1 << 8)
  80 #define STAT_DATA_DONE  (1 << 11)
  81 #define STAT_PRG_DONE   (1 << 12)
  82 #define STAT_END_CMDRES (1 << 13)
  83 #define SPI_SPI_MODE    (1 << 0)
  84 #define CMDAT_RES_TYPE  (3 << 0)
  85 #define CMDAT_DATA_EN   (1 << 2)
  86 #define CMDAT_WR_RD     (1 << 3)
  87 #define CMDAT_DMA_EN    (1 << 7)
  88 #define CMDAT_STOP_TRAN (1 << 10)
  89 #define INT_DATA_DONE   (1 << 0)
  90 #define INT_PRG_DONE    (1 << 1)
  91 #define INT_END_CMD     (1 << 2)
  92 #define INT_STOP_CMD    (1 << 3)
  93 #define INT_CLK_OFF     (1 << 4)
  94 #define INT_RXFIFO_REQ  (1 << 5)
  95 #define INT_TXFIFO_REQ  (1 << 6)
  96 #define INT_TINT        (1 << 7)
  97 #define INT_DAT_ERR     (1 << 8)
  98 #define INT_RES_ERR     (1 << 9)
  99 #define INT_RD_STALLED  (1 << 10)
 100 #define INT_SDIO_INT    (1 << 11)
 101 #define INT_SDIO_SACK   (1 << 12)
 102 #define PRTBUF_PRT_BUF  (1 << 0)
 103
 104 /* Route internal interrupt lines to the global IC and DMA */
 105 static void pxa2xx_mmci_int_update(PXA2xxMMCIState *s)
 106 {
 107     uint32_t mask = s->intmask;
 108     if (s->cmdat & CMDAT_DMA_EN) {
 109         mask |= INT_RXFIFO_REQ | INT_TXFIFO_REQ;
 110
 111         qemu_set_irq(s->rx_dma, !!(s->intreq & INT_RXFIFO_REQ));
 112         qemu_set_irq(s->tx_dma, !!(s->intreq & INT_TXFIFO_REQ));
 113     }
 114
 115     qemu_set_irq(s->irq, !!(s->intreq & ~mask));
 116 }
 117
 118 static void pxa2xx_mmci_fifo_update(PXA2xxMMCIState *s)
 119 {
 120     if (!s->active)
 121         return;
 122
 123     if (s->cmdat & CMDAT_WR_RD) {
 124         while (s->bytesleft && s->tx_len) {
 125             sd_write_data(s->card, s->tx_fifo[s->tx_start ++]);
 126             s->tx_start &= 0x1f;
 127             s->tx_len --;
 128             s->bytesleft --;
 129         }
 130         if (s->bytesleft)
 131             s->intreq |= INT_TXFIFO_REQ;
 132     } else
 133         while (s->bytesleft && s->rx_len < 32) {
 134             s->rx_fifo[(s->rx_start + (s->rx_len ++)) & 0x1f] =
 135                 sd_read_data(s->card);
 136             s->bytesleft --;
 137             s->intreq |= INT_RXFIFO_REQ;
 138         }
 139
 140     if (!s->bytesleft) {
 141         s->active = 0;
 142         s->intreq |= INT_DATA_DONE;
 143         s->status |= STAT_DATA_DONE;
 144
 145         if (s->cmdat & CMDAT_WR_RD) {
 146             s->intreq |= INT_PRG_DONE;
 147             s->status |= STAT_PRG_DONE;
 148         }
 149     }
 150
 151     pxa2xx_mmci_int_update(s);
 152 }
 153
 154 static void pxa2xx_mmci_wakequeues(PXA2xxMMCIState *s)
 155 {
 156     int rsplen, i;
 157     SDRequest request;
 158     uint8_t response[16];
 159
 160     s->active = 1;
 161     s->rx_len = 0;
 162     s->tx_len = 0;
 163     s->cmdreq = 0;
 164
 165     request.cmd = s->cmd;
 166     request.arg = s->arg;
 167     request.crc = 0;    /* FIXME */
 168
 169     rsplen = sd_do_command(s->card, &request, response);
 170     s->intreq |= INT_END_CMD;
 171
 172     memset(s->resp_fifo, 0, sizeof(s->resp_fifo));
 173     switch (s->cmdat & CMDAT_RES_TYPE) {
 174 #define PXAMMCI_RESP(wd, value0, value1)        \
 175         s->resp_fifo[(wd) + 0] |= (value0);     \
 176         s->resp_fifo[(wd) + 1] |= (value1) << 8;
 177     case 0:     /* No response */
 178         goto complete;
 179
 180     case 1:     /* R1, R4, R5 or R6 */
 181         if (rsplen < 4)
 182             goto timeout;
 183         goto complete;
 184
 185     case 2:     /* R2 */
 186         if (rsplen < 16)
 187             goto timeout;
 188         goto complete;
 189
 190     case 3:     /* R3 */
 191         if (rsplen < 4)
 192             goto timeout;
 193         goto complete;
 194
 195     complete:
 196         for (i = 0; rsplen > 0; i ++, rsplen -= 2) {
 197             PXAMMCI_RESP(i, response[i * 2], response[i * 2 + 1]);
 198         }
 199         s->status |= STAT_END_CMDRES;
 200
 201         if (!(s->cmdat & CMDAT_DATA_EN))
 202             s->active = 0;
 203         else
 204             s->bytesleft = s->numblk * s->blklen;
 205
 206         s->resp_len = 0;
 207         break;
 208
 209     timeout:
 210         s->active = 0;
 211         s->status |= STAT_TOUT_RES;
 212         break;
 213     }
 214
 215     pxa2xx_mmci_fifo_update(s);
 216 }
 217
 218 static uint32_t pxa2xx_mmci_read(void *opaque, hwaddr offset)
 219 {
 220     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 221     uint32_t ret;
 222
 223     switch (offset) {
 224     case MMC_STRPCL:
 225         return 0;
 226     case MMC_STAT:
 227         return s->status;
 228     case MMC_CLKRT:
 229         return s->clkrt;
 230     case MMC_SPI:
 231         return s->spi;
 232     case MMC_CMDAT:
 233         return s->cmdat;
 234     case MMC_RESTO:
 235         return s->resp_tout;
 236     case MMC_RDTO:
 237         return s->read_tout;
 238     case MMC_BLKLEN:
 239         return s->blklen;
 240     case MMC_NUMBLK:
 241         return s->numblk;
 242     case MMC_PRTBUF:
 243         return 0;
 244     case MMC_I_MASK:
 245         return s->intmask;
 246     case MMC_I_REG:
 247         return s->intreq;
 248     case MMC_CMD:
 249         return s->cmd | 0x40;
 250     case MMC_ARGH:
 251         return s->arg >> 16;
 252     case MMC_ARGL:
 253         return s->arg & 0xffff;
 254     case MMC_RES:
 255         if (s->resp_len < 9)
 256             return s->resp_fifo[s->resp_len ++];
 257         return 0;
 258     case MMC_RXFIFO:
 259         ret = 0;
 260         while (s->ac_width -- && s->rx_len) {
 261             ret |= s->rx_fifo[s->rx_start ++] << (s->ac_width << 3);
 262             s->rx_start &= 0x1f;
 263             s->rx_len --;
 264         }
 265         s->intreq &= ~INT_RXFIFO_REQ;
 266         pxa2xx_mmci_fifo_update(s);
 267         return ret;
 268     case MMC_RDWAIT:
 269         return 0;
 270     case MMC_BLKS_REM:
 271         return s->numblk;
 272     default:
 273         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 274     }
 275
 276     return 0;
 277 }
 278
 279 static void pxa2xx_mmci_write(void *opaque,
 280                 hwaddr offset, uint32_t value)
 281 {
 282     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 283
 284     switch (offset) {
 285     case MMC_STRPCL:
 286         if (value & STRPCL_STRT_CLK) {
 287             s->status |= STAT_CLK_EN;
 288             s->intreq &= ~INT_CLK_OFF;
 289
 290             if (s->cmdreq && !(s->cmdat & CMDAT_STOP_TRAN)) {
 291                 s->status &= STAT_CLK_EN;
 292                 pxa2xx_mmci_wakequeues(s);
 293             }
 294         }
 295
 296         if (value & STRPCL_STOP_CLK) {
 297             s->status &= ~STAT_CLK_EN;
 298             s->intreq |= INT_CLK_OFF;
 299             s->active = 0;
 300         }
 301
 302         pxa2xx_mmci_int_update(s);
 303         break;
 304
 305     case MMC_CLKRT:
 306         s->clkrt = value & 7;
 307         break;
 308
 309     case MMC_SPI:
 310         s->spi = value & 0xf;
 311         if (value & SPI_SPI_MODE)
 312             printf("%s: attempted to use card in SPI mode\n", __FUNCTION__);
 313         break;
 314
 315     case MMC_CMDAT:
 316         s->cmdat = value & 0x3dff;
 317         s->active = 0;
 318         s->cmdreq = 1;
 319         if (!(value & CMDAT_STOP_TRAN)) {
 320             s->status &= STAT_CLK_EN;
 321
 322             if (s->status & STAT_CLK_EN)
 323                 pxa2xx_mmci_wakequeues(s);
 324         }
 325
 326         pxa2xx_mmci_int_update(s);
 327         break;
 328
 329     case MMC_RESTO:
 330         s->resp_tout = value & 0x7f;
 331         break;
 332
 333     case MMC_RDTO:
 334         s->read_tout = value & 0xffff;
 335         break;
 336
 337     case MMC_BLKLEN:
 338         s->blklen = value & 0xfff;
 339         break;
 340
 341     case MMC_NUMBLK:
 342         s->numblk = value & 0xffff;
 343         break;
 344
 345     case MMC_PRTBUF:
 346         if (value & PRTBUF_PRT_BUF) {
 347             s->tx_start ^= 32;
 348             s->tx_len = 0;
 349         }
 350         pxa2xx_mmci_fifo_update(s);
 351         break;
 352
 353     case MMC_I_MASK:
 354         s->intmask = value & 0x1fff;
 355         pxa2xx_mmci_int_update(s);
 356         break;
 357
 358     case MMC_CMD:
 359         s->cmd = value & 0x3f;
 360         break;
 361
 362     case MMC_ARGH:
 363         s->arg &= 0x0000ffff;
 364         s->arg |= value << 16;
 365         break;
 366
 367     case MMC_ARGL:
 368         s->arg &= 0xffff0000;
 369         s->arg |= value & 0x0000ffff;
 370         break;
 371
 372     case MMC_TXFIFO:
 373         while (s->ac_width -- && s->tx_len < 0x20)
 374             s->tx_fifo[(s->tx_start + (s->tx_len ++)) & 0x1f] =
 375                     (value >> (s->ac_width << 3)) & 0xff;
 376         s->intreq &= ~INT_TXFIFO_REQ;
 377         pxa2xx_mmci_fifo_update(s);
 378         break;
 379
 380     case MMC_RDWAIT:
 381     case MMC_BLKS_REM:
 382         break;
 383
 384     default:
 385         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 386     }
 387 }
 388
 389 static uint32_t pxa2xx_mmci_readb(void *opaque, hwaddr offset)
 390 {
 391     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 392     s->ac_width = 1;
 393     return pxa2xx_mmci_read(opaque, offset);
 394 }
 395
 396 static uint32_t pxa2xx_mmci_readh(void *opaque, hwaddr offset)
 397 {
 398     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 399     s->ac_width = 2;
 400     return pxa2xx_mmci_read(opaque, offset);
 401 }
 402
 403 static uint32_t pxa2xx_mmci_readw(void *opaque, hwaddr offset)
 404 {
 405     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 406     s->ac_width = 4;
 407     return pxa2xx_mmci_read(opaque, offset);
 408 }
 409
 410 static void pxa2xx_mmci_writeb(void *opaque,
 411                 hwaddr offset, uint32_t value)
 412 {
 413     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 414     s->ac_width = 1;
 415     pxa2xx_mmci_write(opaque, offset, value);
 416 }
 417
 418 static void pxa2xx_mmci_writeh(void *opaque,
 419                 hwaddr offset, uint32_t value)
 420 {
 421     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 422     s->ac_width = 2;
 423     pxa2xx_mmci_write(opaque, offset, value);
 424 }
 425
 426 static void pxa2xx_mmci_writew(void *opaque,
 427                 hwaddr offset, uint32_t value)
 428 {
 429     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 430     s->ac_width = 4;
 431     pxa2xx_mmci_write(opaque, offset, value);
 432 }
 433
 434 static const MemoryRegionOps pxa2xx_mmci_ops = {
 435     .old_mmio = {
 436         .read = { pxa2xx_mmci_readb,
 437                   pxa2xx_mmci_readh,
 438                   pxa2xx_mmci_readw, },
 439         .write = { pxa2xx_mmci_writeb,
 440                    pxa2xx_mmci_writeh,
 441                    pxa2xx_mmci_writew, },
 442     },
 443     .endianness = DEVICE_NATIVE_ENDIAN,
 444 };
 445
 446 static void pxa2xx_mmci_save(QEMUFile *f, void *opaque)
 447 {
 448     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 449     int i;
 450
 451     qemu_put_be32s(f, &s->status);
 452     qemu_put_be32s(f, &s->clkrt);
 453     qemu_put_be32s(f, &s->spi);
 454     qemu_put_be32s(f, &s->cmdat);
 455     qemu_put_be32s(f, &s->resp_tout);
 456     qemu_put_be32s(f, &s->read_tout);
 457     qemu_put_be32(f, s->blklen);
 458     qemu_put_be32(f, s->numblk);
 459     qemu_put_be32s(f, &s->intmask);
 460     qemu_put_be32s(f, &s->intreq);
 461     qemu_put_be32(f, s->cmd);
 462     qemu_put_be32s(f, &s->arg);
 463     qemu_put_be32(f, s->cmdreq);
 464     qemu_put_be32(f, s->active);
 465     qemu_put_be32(f, s->bytesleft);
 466
 467     qemu_put_byte(f, s->tx_len);
 468     for (i = 0; i < s->tx_len; i ++)
 469         qemu_put_byte(f, s->tx_fifo[(s->tx_start + i) & 63]);
 470
 471     qemu_put_byte(f, s->rx_len);
 472     for (i = 0; i < s->rx_len; i ++)
 473         qemu_put_byte(f, s->rx_fifo[(s->rx_start + i) & 31]);
 474
 475     qemu_put_byte(f, s->resp_len);
 476     for (i = s->resp_len; i < 9; i ++)
 477         qemu_put_be16s(f, &s->resp_fifo[i]);
 478 }
 479
 480 static int pxa2xx_mmci_load(QEMUFile *f, void *opaque, int version_id)
 481 {
 482     PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
 483     int i;
 484
 485     qemu_get_be32s(f, &s->status);
 486     qemu_get_be32s(f, &s->clkrt);
 487     qemu_get_be32s(f, &s->spi);
 488     qemu_get_be32s(f, &s->cmdat);
 489     qemu_get_be32s(f, &s->resp_tout);
 490     qemu_get_be32s(f, &s->read_tout);
 491     s->blklen = qemu_get_be32(f);
 492     s->numblk = qemu_get_be32(f);
 493     qemu_get_be32s(f, &s->intmask);
 494     qemu_get_be32s(f, &s->intreq);
 495     s->cmd = qemu_get_be32(f);
 496     qemu_get_be32s(f, &s->arg);
 497     s->cmdreq = qemu_get_be32(f);
 498     s->active = qemu_get_be32(f);
 499     s->bytesleft = qemu_get_be32(f);
 500
 501     s->tx_len = qemu_get_byte(f);
 502     s->tx_start = 0;
 503     if (s->tx_len >= sizeof(s->tx_fifo) || s->tx_len < 0)
 504         return -EINVAL;
 505     for (i = 0; i < s->tx_len; i ++)
 506         s->tx_fifo[i] = qemu_get_byte(f);
 507
 508     s->rx_len = qemu_get_byte(f);
 509     s->rx_start = 0;
 510     if (s->rx_len >= sizeof(s->rx_fifo) || s->rx_len < 0)
 511         return -EINVAL;
 512     for (i = 0; i < s->rx_len; i ++)
 513         s->rx_fifo[i] = qemu_get_byte(f);
 514
 515     s->resp_len = qemu_get_byte(f);
 516     if (s->resp_len > 9 || s->resp_len < 0)
 517         return -EINVAL;
 518     for (i = s->resp_len; i < 9; i ++)
 519          qemu_get_be16s(f, &s->resp_fifo[i]);
 520
 521     return 0;
 522 }
 523
 524 PXA2xxMMCIState *pxa2xx_mmci_init(MemoryRegion *sysmem,
 525                 hwaddr base,
 526                 BlockDriverState *bd, qemu_irq irq,
 527                 qemu_irq rx_dma, qemu_irq tx_dma)
 528 {
 529     PXA2xxMMCIState *s;
 530
 531     s = (PXA2xxMMCIState *) g_malloc0(sizeof(PXA2xxMMCIState));
 532     s->irq = irq;
 533     s->rx_dma = rx_dma;
 534     s->tx_dma = tx_dma;
 535
 536     memory_region_init_io(&s->iomem, &pxa2xx_mmci_ops, s,
 537                           "pxa2xx-mmci", 0x00100000);
 538     memory_region_add_subregion(sysmem, base, &s->iomem);
 539
 540     /* Instantiate the actual storage */
 541     s->card = sd_init(bd, 0);
 542
 543     register_savevm(NULL, "pxa2xx_mmci", 0, 0,
 544                     pxa2xx_mmci_save, pxa2xx_mmci_load, s);
 545
 546     return s;
 547 }
 548
 549 void pxa2xx_mmci_handlers(PXA2xxMMCIState *s, qemu_irq readonly,
 550                 qemu_irq coverswitch)
 551 {
 552     sd_set_cb(s->card, readonly, coverswitch);
 553 }