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