drivers/mmc/host/sdricoh_cs.c

   1 /*
   2  *  sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
   3  *     found on some Ricoh RL5c476 II cardbus bridge
   4  *
   5  *  Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 /*
  24 #define DEBUG
  25 #define VERBOSE_DEBUG
  26 */
  27 #include <linux/delay.h>
  28 #include <linux/highmem.h>
  29 #include <linux/pci.h>
  30 #include <linux/ioport.h>
  31 #include <linux/scatterlist.h>
  32
  33 #include <pcmcia/cistpl.h>
  34 #include <pcmcia/ds.h>
  35 #include <linux/io.h>
  36
  37 #include <linux/mmc/host.h>
  38
  39 #define DRIVER_NAME "sdricoh_cs"
  40
  41 static unsigned int switchlocked;
  42
  43 /* i/o region */
  44 #define SDRICOH_PCI_REGION 0
  45 #define SDRICOH_PCI_REGION_SIZE 0x1000
  46
  47 /* registers */
  48 #define R104_VERSION     0x104
  49 #define R200_CMD         0x200
  50 #define R204_CMD_ARG     0x204
  51 #define R208_DATAIO      0x208
  52 #define R20C_RESP        0x20c
  53 #define R21C_STATUS      0x21c
  54 #define R2E0_INIT        0x2e0
  55 #define R2E4_STATUS_RESP 0x2e4
  56 #define R2F0_RESET       0x2f0
  57 #define R224_MODE        0x224
  58 #define R226_BLOCKSIZE   0x226
  59 #define R228_POWER       0x228
  60 #define R230_DATA        0x230
  61
  62 /* flags for the R21C_STATUS register */
  63 #define STATUS_CMD_FINISHED      0x00000001
  64 #define STATUS_TRANSFER_FINISHED 0x00000004
  65 #define STATUS_CARD_INSERTED     0x00000020
  66 #define STATUS_CARD_LOCKED       0x00000080
  67 #define STATUS_CMD_TIMEOUT       0x00400000
  68 #define STATUS_READY_TO_READ     0x01000000
  69 #define STATUS_READY_TO_WRITE    0x02000000
  70 #define STATUS_BUSY              0x40000000
  71
  72 /* timeouts */
  73 #define INIT_TIMEOUT      100
  74 #define CMD_TIMEOUT       100000
  75 #define TRANSFER_TIMEOUT  100000
  76 #define BUSY_TIMEOUT      32767
  77
  78 /* list of supported pcmcia devices */
  79 static const struct pcmcia_device_id pcmcia_ids[] = {
  80         /* vendor and device strings followed by their crc32 hashes */
  81         PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
  82                                 0xc3901202),
  83         PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay Controller", 0xd9f522ed,
  84                                 0xace80909),
  85         PCMCIA_DEVICE_NULL,
  86 };
  87
  88 MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
  89
  90 /* mmc privdata */
  91 struct sdricoh_host {
  92         struct device *dev;
  93         struct mmc_host *mmc;   /* MMC structure */
  94         unsigned char __iomem *iobase;
  95         struct pci_dev *pci_dev;
  96         int app_cmd;
  97 };
  98
  99 /***************** register i/o helper functions *****************************/
 100
 101 static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
 102                                          unsigned int reg)
 103 {
 104         unsigned int value = readl(host->iobase + reg);
 105         dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
 106         return value;
 107 }
 108
 109 static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
 110                                   unsigned int value)
 111 {
 112         writel(value, host->iobase + reg);
 113         dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
 114
 115 }
 116
 117 static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
 118                                          unsigned int reg)
 119 {
 120         unsigned int value = readw(host->iobase + reg);
 121         dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
 122         return value;
 123 }
 124
 125 static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
 126                                          unsigned short value)
 127 {
 128         writew(value, host->iobase + reg);
 129         dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
 130 }
 131
 132 static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
 133                                          unsigned int reg)
 134 {
 135         unsigned int value = readb(host->iobase + reg);
 136         dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
 137         return value;
 138 }
 139
 140 static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted,
 141                                 unsigned int timeout){
 142         unsigned int loop;
 143         unsigned int status = 0;
 144         struct device *dev = host->dev;
 145         for (loop = 0; loop < timeout; loop++) {
 146                 status = sdricoh_readl(host, R21C_STATUS);
 147                 sdricoh_writel(host, R2E4_STATUS_RESP, status);
 148                 if (status & wanted)
 149                         break;
 150         }
 151
 152         if (loop == timeout) {
 153                 dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
 154                 return -ETIMEDOUT;
 155         }
 156
 157         /* do not do this check in the loop as some commands fail otherwise */
 158         if (status & 0x7F0000) {
 159                 dev_err(dev, "waiting for status bit %x failed\n", wanted);
 160                 return -EINVAL;
 161         }
 162         return 0;
 163
 164 }
 165
 166 static int sdricoh_mmc_cmd(struct sdricoh_host *host, unsigned char opcode,
 167                            unsigned int arg)
 168 {
 169         unsigned int status;
 170         int result = 0;
 171         unsigned int loop = 0;
 172         /* reset status reg? */
 173         sdricoh_writel(host, R21C_STATUS, 0x18);
 174         /* fill parameters */
 175         sdricoh_writel(host, R204_CMD_ARG, arg);
 176         sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
 177         /* wait for command completion */
 178         if (opcode) {
 179                 for (loop = 0; loop < CMD_TIMEOUT; loop++) {
 180                         status = sdricoh_readl(host, R21C_STATUS);
 181                         sdricoh_writel(host, R2E4_STATUS_RESP, status);
 182                         if (status  & STATUS_CMD_FINISHED)
 183                                 break;
 184                 }
 185                 /* don't check for timeout in the loop it is not always
 186                    reset correctly
 187                 */
 188                 if (loop == CMD_TIMEOUT || status & STATUS_CMD_TIMEOUT)
 189                         result = -ETIMEDOUT;
 190
 191         }
 192
 193         return result;
 194
 195 }
 196
 197 static int sdricoh_reset(struct sdricoh_host *host)
 198 {
 199         dev_dbg(host->dev, "reset\n");
 200         sdricoh_writel(host, R2F0_RESET, 0x10001);
 201         sdricoh_writel(host, R2E0_INIT, 0x10000);
 202         if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
 203                 return -EIO;
 204         sdricoh_writel(host, R2E0_INIT, 0x10007);
 205
 206         sdricoh_writel(host, R224_MODE, 0x2000000);
 207         sdricoh_writel(host, R228_POWER, 0xe0);
 208
 209
 210         /* status register ? */
 211         sdricoh_writel(host, R21C_STATUS, 0x18);
 212
 213         return 0;
 214 }
 215
 216 static int sdricoh_blockio(struct sdricoh_host *host, int read,
 217                                 u8 *buf, int len)
 218 {
 219         int size;
 220         u32 data = 0;
 221         /* wait until the data is available */
 222         if (read) {
 223                 if (sdricoh_query_status(host, STATUS_READY_TO_READ,
 224                                                 TRANSFER_TIMEOUT))
 225                         return -ETIMEDOUT;
 226                 sdricoh_writel(host, R21C_STATUS, 0x18);
 227                 /* read data */
 228                 while (len) {
 229                         data = sdricoh_readl(host, R230_DATA);
 230                         size = min(len, 4);
 231                         len -= size;
 232                         while (size) {
 233                                 *buf = data & 0xFF;
 234                                 buf++;
 235                                 data >>= 8;
 236                                 size--;
 237                         }
 238                 }
 239         } else {
 240                 if (sdricoh_query_status(host, STATUS_READY_TO_WRITE,
 241                                                 TRANSFER_TIMEOUT))
 242                         return -ETIMEDOUT;
 243                 sdricoh_writel(host, R21C_STATUS, 0x18);
 244                 /* write data */
 245                 while (len) {
 246                         size = min(len, 4);
 247                         len -= size;
 248                         while (size) {
 249                                 data >>= 8;
 250                                 data |= (u32)*buf << 24;
 251                                 buf++;
 252                                 size--;
 253                         }
 254                         sdricoh_writel(host, R230_DATA, data);
 255                 }
 256         }
 257
 258         if (len)
 259                 return -EIO;
 260
 261         return 0;
 262 }
 263
 264 static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
 265 {
 266         struct sdricoh_host *host = mmc_priv(mmc);
 267         struct mmc_command *cmd = mrq->cmd;
 268         struct mmc_data *data = cmd->data;
 269         struct device *dev = host->dev;
 270         unsigned char opcode = cmd->opcode;
 271         int i;
 272
 273         dev_dbg(dev, "=============================\n");
 274         dev_dbg(dev, "sdricoh_request opcode=%i\n", opcode);
 275
 276         sdricoh_writel(host, R21C_STATUS, 0x18);
 277
 278         /* MMC_APP_CMDs need some special handling */
 279         if (host->app_cmd) {
 280                 opcode |= 64;
 281                 host->app_cmd = 0;
 282         } else if (opcode == 55)
 283                 host->app_cmd = 1;
 284
 285         /* read/write commands seem to require this */
 286         if (data) {
 287                 sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
 288                 sdricoh_writel(host, R208_DATAIO, 0);
 289         }
 290
 291         cmd->error = sdricoh_mmc_cmd(host, opcode, cmd->arg);
 292
 293         /* read response buffer */
 294         if (cmd->flags & MMC_RSP_PRESENT) {
 295                 if (cmd->flags & MMC_RSP_136) {
 296                         /* CRC is stripped so we need to do some shifting. */
 297                         for (i = 0; i < 4; i++) {
 298                                 cmd->resp[i] =
 299                                     sdricoh_readl(host,
 300                                                   R20C_RESP + (3 - i) * 4) << 8;
 301                                 if (i != 3)
 302                                         cmd->resp[i] |=
 303                                             sdricoh_readb(host, R20C_RESP +
 304                                                           (3 - i) * 4 - 1);
 305                         }
 306                 } else
 307                         cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
 308         }
 309
 310         /* transfer data */
 311         if (data && cmd->error == 0) {
 312                 dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
 313                         "sg length %i\n", data->blksz, data->blocks,
 314                         data->sg_len, data->sg->length);
 315
 316                 /* enter data reading mode */
 317                 sdricoh_writel(host, R21C_STATUS, 0x837f031e);
 318                 for (i = 0; i < data->blocks; i++) {
 319                         size_t len = data->blksz;
 320                         u8 *buf;
 321                         struct page *page;
 322                         int result;
 323                         page = sg_page(data->sg);
 324
 325                         buf = kmap(page) + data->sg->offset + (len * i);
 326                         result =
 327                                 sdricoh_blockio(host,
 328                                         data->flags & MMC_DATA_READ, buf, len);
 329                         kunmap(page);
 330                         flush_dcache_page(page);
 331                         if (result) {
 332                                 dev_err(dev, "sdricoh_request: cmd %i "
 333                                         "block transfer failed\n", cmd->opcode);
 334                                 cmd->error = result;
 335                                 break;
 336                         } else
 337                                 data->bytes_xfered += len;
 338                 }
 339
 340                 sdricoh_writel(host, R208_DATAIO, 1);
 341
 342                 if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED,
 343                                         TRANSFER_TIMEOUT)) {
 344                         dev_err(dev, "sdricoh_request: transfer end error\n");
 345                         cmd->error = -EINVAL;
 346                 }
 347         }
 348         /* FIXME check busy flag */
 349
 350         mmc_request_done(mmc, mrq);
 351         dev_dbg(dev, "=============================\n");
 352 }
 353
 354 static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 355 {
 356         struct sdricoh_host *host = mmc_priv(mmc);
 357         dev_dbg(host->dev, "set_ios\n");
 358
 359         if (ios->power_mode == MMC_POWER_ON) {
 360                 sdricoh_writel(host, R228_POWER, 0xc0e0);
 361
 362                 if (ios->bus_width == MMC_BUS_WIDTH_4) {
 363                         sdricoh_writel(host, R224_MODE, 0x2000300);
 364                         sdricoh_writel(host, R228_POWER, 0x40e0);
 365                 } else {
 366                         sdricoh_writel(host, R224_MODE, 0x2000340);
 367                 }
 368
 369         } else if (ios->power_mode == MMC_POWER_UP) {
 370                 sdricoh_writel(host, R224_MODE, 0x2000320);
 371                 sdricoh_writel(host, R228_POWER, 0xe0);
 372         }
 373 }
 374
 375 static int sdricoh_get_ro(struct mmc_host *mmc)
 376 {
 377         struct sdricoh_host *host = mmc_priv(mmc);
 378         unsigned int status;
 379
 380         status = sdricoh_readl(host, R21C_STATUS);
 381         sdricoh_writel(host, R2E4_STATUS_RESP, status);
 382
 383         /* some notebooks seem to have the locked flag switched */
 384         if (switchlocked)
 385                 return !(status & STATUS_CARD_LOCKED);
 386
 387         return (status & STATUS_CARD_LOCKED);
 388 }
 389
 390 static struct mmc_host_ops sdricoh_ops = {
 391         .request = sdricoh_request,
 392         .set_ios = sdricoh_set_ios,
 393         .get_ro = sdricoh_get_ro,
 394 };
 395
 396 /* initialize the control and register it to the mmc framework */
 397 static int sdricoh_init_mmc(struct pci_dev *pci_dev,
 398                             struct pcmcia_device *pcmcia_dev)
 399 {
 400         int result = 0;
 401         void __iomem *iobase = NULL;
 402         struct mmc_host *mmc = NULL;
 403         struct sdricoh_host *host = NULL;
 404         struct device *dev = &pcmcia_dev->dev;
 405         /* map iomem */
 406         if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
 407             SDRICOH_PCI_REGION_SIZE) {
 408                 dev_dbg(dev, "unexpected pci resource len\n");
 409                 return -ENODEV;
 410         }
 411         iobase =
 412             pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
 413         if (!iobase) {
 414                 dev_err(dev, "unable to map iobase\n");
 415                 return -ENODEV;
 416         }
 417         /* check version? */
 418         if (readl(iobase + R104_VERSION) != 0x4000) {
 419                 dev_dbg(dev, "no supported mmc controller found\n");
 420                 result = -ENODEV;
 421                 goto err;
 422         }
 423         /* allocate privdata */
 424         mmc = pcmcia_dev->priv =
 425             mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
 426         if (!mmc) {
 427                 dev_err(dev, "mmc_alloc_host failed\n");
 428                 result = -ENOMEM;
 429                 goto err;
 430         }
 431         host = mmc_priv(mmc);
 432
 433         host->iobase = iobase;
 434         host->dev = dev;
 435         host->pci_dev = pci_dev;
 436
 437         mmc->ops = &sdricoh_ops;
 438
 439         /* FIXME: frequency and voltage handling is done by the controller
 440          */
 441         mmc->f_min = 450000;
 442         mmc->f_max = 24000000;
 443         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 444         mmc->caps |= MMC_CAP_4_BIT_DATA;
 445
 446         mmc->max_seg_size = 1024 * 512;
 447         mmc->max_blk_size = 512;
 448
 449         /* reset the controller */
 450         if (sdricoh_reset(host)) {
 451                 dev_dbg(dev, "could not reset\n");
 452                 result = -EIO;
 453                 goto err;
 454
 455         }
 456
 457         result = mmc_add_host(mmc);
 458
 459         if (!result) {
 460                 dev_dbg(dev, "mmc host registered\n");
 461                 return 0;
 462         }
 463
 464 err:
 465         if (iobase)
 466                 pci_iounmap(pci_dev, iobase);
 467         if (mmc)
 468                 mmc_free_host(mmc);
 469
 470         return result;
 471 }
 472
 473 /* search for supported mmc controllers */
 474 static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
 475 {
 476         struct pci_dev *pci_dev = NULL;
 477
 478         dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
 479                 " %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
 480
 481         /* search pci cardbus bridge that contains the mmc controller */
 482         /* the io region is already claimed by yenta_socket... */
 483         while ((pci_dev =
 484                 pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
 485                                pci_dev))) {
 486                 /* try to init the device */
 487                 if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
 488                         dev_info(&pcmcia_dev->dev, "MMC controller found\n");
 489                         return 0;
 490                 }
 491
 492         }
 493         dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
 494         return -ENODEV;
 495 }
 496
 497 static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
 498 {
 499         struct mmc_host *mmc = link->priv;
 500
 501         dev_dbg(&link->dev, "detach\n");
 502
 503         /* remove mmc host */
 504         if (mmc) {
 505                 struct sdricoh_host *host = mmc_priv(mmc);
 506                 mmc_remove_host(mmc);
 507                 pci_iounmap(host->pci_dev, host->iobase);
 508                 pci_dev_put(host->pci_dev);
 509                 mmc_free_host(mmc);
 510         }
 511         pcmcia_disable_device(link);
 512
 513 }
 514
 515 #ifdef CONFIG_PM
 516 static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
 517 {
 518         struct mmc_host *mmc = link->priv;
 519         dev_dbg(&link->dev, "suspend\n");
 520         mmc_suspend_host(mmc);
 521         return 0;
 522 }
 523
 524 static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
 525 {
 526         struct mmc_host *mmc = link->priv;
 527         dev_dbg(&link->dev, "resume\n");
 528         sdricoh_reset(mmc_priv(mmc));
 529         mmc_resume_host(mmc);
 530         return 0;
 531 }
 532 #else
 533 #define sdricoh_pcmcia_suspend NULL
 534 #define sdricoh_pcmcia_resume NULL
 535 #endif
 536
 537 static struct pcmcia_driver sdricoh_driver = {
 538         .name = DRIVER_NAME,
 539         .probe = sdricoh_pcmcia_probe,
 540         .remove = sdricoh_pcmcia_detach,
 541         .id_table = pcmcia_ids,
 542         .suspend = sdricoh_pcmcia_suspend,
 543         .resume = sdricoh_pcmcia_resume,
 544 };
 545
 546 /*****************************************************************************\
 547  *                                                                           *
 548  * Driver init/exit                                                          *
 549  *                                                                           *
 550 \*****************************************************************************/
 551
 552 static int __init sdricoh_drv_init(void)
 553 {
 554         return pcmcia_register_driver(&sdricoh_driver);
 555 }
 556
 557 static void __exit sdricoh_drv_exit(void)
 558 {
 559         pcmcia_unregister_driver(&sdricoh_driver);
 560 }
 561
 562 module_init(sdricoh_drv_init);
 563 module_exit(sdricoh_drv_exit);
 564
 565 module_param(switchlocked, uint, 0444);
 566
 567 MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
 568 MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
 569 MODULE_LICENSE("GPL");
 570
 571 MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
 572                 "Use this when unlocked cards are shown readonly (default 0)");