drivers/mmc/host/sdricoh_cs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
   4  *     found on some Ricoh RL5c476 II cardbus bridge
   5  *
   6  *  Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
   7  */
   8
   9 /*
  10 #define DEBUG
  11 #define VERBOSE_DEBUG
  12 */
  13 #include <linux/delay.h>
  14 #include <linux/highmem.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/ioport.h>
  18 #include <linux/iopoll.h>
  19 #include <linux/scatterlist.h>
  20
  21 #include <pcmcia/cistpl.h>
  22 #include <pcmcia/ds.h>
  23 #include <linux/io.h>
  24
  25 #include <linux/mmc/host.h>
  26 #include <linux/mmc/mmc.h>
  27
  28 #define DRIVER_NAME "sdricoh_cs"
  29
  30 static unsigned int switchlocked;
  31
  32 /* i/o region */
  33 #define SDRICOH_PCI_REGION 0
  34 #define SDRICOH_PCI_REGION_SIZE 0x1000
  35
  36 /* registers */
  37 #define R104_VERSION     0x104
  38 #define R200_CMD         0x200
  39 #define R204_CMD_ARG     0x204
  40 #define R208_DATAIO      0x208
  41 #define R20C_RESP        0x20c
  42 #define R21C_STATUS      0x21c
  43 #define R2E0_INIT        0x2e0
  44 #define R2E4_STATUS_RESP 0x2e4
  45 #define R2F0_RESET       0x2f0
  46 #define R224_MODE        0x224
  47 #define R226_BLOCKSIZE   0x226
  48 #define R228_POWER       0x228
  49 #define R230_DATA        0x230
  50
  51 /* flags for the R21C_STATUS register */
  52 #define STATUS_CMD_FINISHED      0x00000001
  53 #define STATUS_TRANSFER_FINISHED 0x00000004
  54 #define STATUS_CARD_INSERTED     0x00000020
  55 #define STATUS_CARD_LOCKED       0x00000080
  56 #define STATUS_CMD_TIMEOUT       0x00400000
  57 #define STATUS_READY_TO_READ     0x01000000
  58 #define STATUS_READY_TO_WRITE    0x02000000
  59 #define STATUS_BUSY              0x40000000
  60
  61 /* timeouts */
  62 #define SDRICOH_CMD_TIMEOUT_US  1000000
  63 #define SDRICOH_DATA_TIMEOUT_US 1000000
  64
  65 /* list of supported pcmcia devices */
  66 static const struct pcmcia_device_id pcmcia_ids[] = {
  67         /* vendor and device strings followed by their crc32 hashes */
  68         PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
  69                                 0xc3901202),
  70         PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay Controller", 0xd9f522ed,
  71                                 0xace80909),
  72         PCMCIA_DEVICE_NULL,
  73 };
  74
  75 MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
  76
  77 /* mmc privdata */
  78 struct sdricoh_host {
  79         struct device *dev;
  80         struct mmc_host *mmc;   /* MMC structure */
  81         unsigned char __iomem *iobase;
  82         struct pci_dev *pci_dev;
  83         int app_cmd;
  84 };
  85
  86 /***************** register i/o helper functions *****************************/
  87
  88 static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
  89                                          unsigned int reg)
  90 {
  91         unsigned int value = readl(host->iobase + reg);
  92         dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
  93         return value;
  94 }
  95
  96 static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
  97                                   unsigned int value)
  98 {
  99         writel(value, host->iobase + reg);
 100         dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
 101
 102 }
 103
 104 static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
 105                                          unsigned int reg)
 106 {
 107         unsigned int value = readw(host->iobase + reg);
 108         dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
 109         return value;
 110 }
 111
 112 static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
 113                                          unsigned short value)
 114 {
 115         writew(value, host->iobase + reg);
 116         dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
 117 }
 118
 119 static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
 120                                          unsigned int reg)
 121 {
 122         unsigned int value = readb(host->iobase + reg);
 123         dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
 124         return value;
 125 }
 126
 127 static bool sdricoh_status_ok(struct sdricoh_host *host, unsigned int status,
 128                               unsigned int wanted)
 129 {
 130         sdricoh_writel(host, R2E4_STATUS_RESP, status);
 131         return status & wanted;
 132 }
 133
 134 static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted)
 135 {
 136         int ret;
 137         unsigned int status = 0;
 138         struct device *dev = host->dev;
 139
 140         ret = read_poll_timeout(sdricoh_readl, status,
 141                                 sdricoh_status_ok(host, status, wanted),
 142                                 32, SDRICOH_DATA_TIMEOUT_US, false,
 143                                 host, R21C_STATUS);
 144         if (ret) {
 145                 dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
 146                 return -ETIMEDOUT;
 147         }
 148
 149         /* do not do this check in the loop as some commands fail otherwise */
 150         if (status & 0x7F0000) {
 151                 dev_err(dev, "waiting for status bit %x failed\n", wanted);
 152                 return -EINVAL;
 153         }
 154         return 0;
 155
 156 }
 157
 158 static int sdricoh_mmc_cmd(struct sdricoh_host *host, struct mmc_command *cmd)
 159 {
 160         unsigned int status, timeout_us;
 161         int ret;
 162         unsigned char opcode = cmd->opcode;
 163
 164         /* reset status reg? */
 165         sdricoh_writel(host, R21C_STATUS, 0x18);
 166
 167         /* MMC_APP_CMDs need some special handling */
 168         if (host->app_cmd) {
 169                 opcode |= 64;
 170                 host->app_cmd = 0;
 171         } else if (opcode == MMC_APP_CMD)
 172                 host->app_cmd = 1;
 173
 174         /* fill parameters */
 175         sdricoh_writel(host, R204_CMD_ARG, cmd->arg);
 176         sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
 177
 178         /* wait for command completion */
 179         if (!opcode)
 180                 return 0;
 181
 182         timeout_us = cmd->busy_timeout ? cmd->busy_timeout * 1000 :
 183                 SDRICOH_CMD_TIMEOUT_US;
 184
 185         ret = read_poll_timeout(sdricoh_readl, status,
 186                         sdricoh_status_ok(host, status, STATUS_CMD_FINISHED),
 187                         32, timeout_us, false,
 188                         host, R21C_STATUS);
 189
 190         /*
 191          * Don't check for timeout status in the loop, as it's not always reset
 192          * correctly.
 193          */
 194         if (ret || status & STATUS_CMD_TIMEOUT)
 195                 return -ETIMEDOUT;
 196
 197         return 0;
 198 }
 199
 200 static int sdricoh_reset(struct sdricoh_host *host)
 201 {
 202         dev_dbg(host->dev, "reset\n");
 203         sdricoh_writel(host, R2F0_RESET, 0x10001);
 204         sdricoh_writel(host, R2E0_INIT, 0x10000);
 205         if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
 206                 return -EIO;
 207         sdricoh_writel(host, R2E0_INIT, 0x10007);
 208
 209         sdricoh_writel(host, R224_MODE, 0x2000000);
 210         sdricoh_writel(host, R228_POWER, 0xe0);
 211
 212
 213         /* status register ? */
 214         sdricoh_writel(host, R21C_STATUS, 0x18);
 215
 216         return 0;
 217 }
 218
 219 static int sdricoh_blockio(struct sdricoh_host *host, int read,
 220                                 u8 *buf, int len)
 221 {
 222         int size;
 223         u32 data = 0;
 224         /* wait until the data is available */
 225         if (read) {
 226                 if (sdricoh_query_status(host, STATUS_READY_TO_READ))
 227                         return -ETIMEDOUT;
 228                 sdricoh_writel(host, R21C_STATUS, 0x18);
 229                 /* read data */
 230                 while (len) {
 231                         data = sdricoh_readl(host, R230_DATA);
 232                         size = min(len, 4);
 233                         len -= size;
 234                         while (size) {
 235                                 *buf = data & 0xFF;
 236                                 buf++;
 237                                 data >>= 8;
 238                                 size--;
 239                         }
 240                 }
 241         } else {
 242                 if (sdricoh_query_status(host, STATUS_READY_TO_WRITE))
 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         return 0;
 260 }
 261
 262 static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
 263 {
 264         struct sdricoh_host *host = mmc_priv(mmc);
 265         struct mmc_command *cmd = mrq->cmd;
 266         struct mmc_data *data = cmd->data;
 267         struct device *dev = host->dev;
 268         int i;
 269
 270         dev_dbg(dev, "=============================\n");
 271         dev_dbg(dev, "sdricoh_request opcode=%i\n", cmd->opcode);
 272
 273         sdricoh_writel(host, R21C_STATUS, 0x18);
 274
 275         /* read/write commands seem to require this */
 276         if (data) {
 277                 sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
 278                 sdricoh_writel(host, R208_DATAIO, 0);
 279         }
 280
 281         cmd->error = sdricoh_mmc_cmd(host, cmd);
 282
 283         /* read response buffer */
 284         if (cmd->flags & MMC_RSP_PRESENT) {
 285                 if (cmd->flags & MMC_RSP_136) {
 286                         /* CRC is stripped so we need to do some shifting. */
 287                         for (i = 0; i < 4; i++) {
 288                                 cmd->resp[i] =
 289                                     sdricoh_readl(host,
 290                                                   R20C_RESP + (3 - i) * 4) << 8;
 291                                 if (i != 3)
 292                                         cmd->resp[i] |=
 293                                             sdricoh_readb(host, R20C_RESP +
 294                                                           (3 - i) * 4 - 1);
 295                         }
 296                 } else
 297                         cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
 298         }
 299
 300         /* transfer data */
 301         if (data && cmd->error == 0) {
 302                 dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
 303                         "sg length %i\n", data->blksz, data->blocks,
 304                         data->sg_len, data->sg->length);
 305
 306                 /* enter data reading mode */
 307                 sdricoh_writel(host, R21C_STATUS, 0x837f031e);
 308                 for (i = 0; i < data->blocks; i++) {
 309                         size_t len = data->blksz;
 310                         u8 *buf;
 311                         struct page *page;
 312                         int result;
 313                         page = sg_page(data->sg);
 314
 315                         buf = kmap(page) + data->sg->offset + (len * i);
 316                         result =
 317                                 sdricoh_blockio(host,
 318                                         data->flags & MMC_DATA_READ, buf, len);
 319                         kunmap(page);
 320                         flush_dcache_page(page);
 321                         if (result) {
 322                                 dev_err(dev, "sdricoh_request: cmd %i "
 323                                         "block transfer failed\n", cmd->opcode);
 324                                 cmd->error = result;
 325                                 break;
 326                         } else
 327                                 data->bytes_xfered += len;
 328                 }
 329
 330                 sdricoh_writel(host, R208_DATAIO, 1);
 331
 332                 if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED)) {
 333                         dev_err(dev, "sdricoh_request: transfer end error\n");
 334                         cmd->error = -EINVAL;
 335                 }
 336         }
 337         /* FIXME check busy flag */
 338
 339         mmc_request_done(mmc, mrq);
 340         dev_dbg(dev, "=============================\n");
 341 }
 342
 343 static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 344 {
 345         struct sdricoh_host *host = mmc_priv(mmc);
 346         dev_dbg(host->dev, "set_ios\n");
 347
 348         if (ios->power_mode == MMC_POWER_ON) {
 349                 sdricoh_writel(host, R228_POWER, 0xc0e0);
 350
 351                 if (ios->bus_width == MMC_BUS_WIDTH_4) {
 352                         sdricoh_writel(host, R224_MODE, 0x2000300);
 353                         sdricoh_writel(host, R228_POWER, 0x40e0);
 354                 } else {
 355                         sdricoh_writel(host, R224_MODE, 0x2000340);
 356                 }
 357
 358         } else if (ios->power_mode == MMC_POWER_UP) {
 359                 sdricoh_writel(host, R224_MODE, 0x2000320);
 360                 sdricoh_writel(host, R228_POWER, 0xe0);
 361         }
 362 }
 363
 364 static int sdricoh_get_ro(struct mmc_host *mmc)
 365 {
 366         struct sdricoh_host *host = mmc_priv(mmc);
 367         unsigned int status;
 368
 369         status = sdricoh_readl(host, R21C_STATUS);
 370         sdricoh_writel(host, R2E4_STATUS_RESP, status);
 371
 372         /* some notebooks seem to have the locked flag switched */
 373         if (switchlocked)
 374                 return !(status & STATUS_CARD_LOCKED);
 375
 376         return (status & STATUS_CARD_LOCKED);
 377 }
 378
 379 static const struct mmc_host_ops sdricoh_ops = {
 380         .request = sdricoh_request,
 381         .set_ios = sdricoh_set_ios,
 382         .get_ro = sdricoh_get_ro,
 383 };
 384
 385 /* initialize the control and register it to the mmc framework */
 386 static int sdricoh_init_mmc(struct pci_dev *pci_dev,
 387                             struct pcmcia_device *pcmcia_dev)
 388 {
 389         int result;
 390         void __iomem *iobase;
 391         struct mmc_host *mmc;
 392         struct sdricoh_host *host;
 393         struct device *dev = &pcmcia_dev->dev;
 394         /* map iomem */
 395         if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
 396             SDRICOH_PCI_REGION_SIZE) {
 397                 dev_dbg(dev, "unexpected pci resource len\n");
 398                 return -ENODEV;
 399         }
 400         iobase =
 401             pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
 402         if (!iobase) {
 403                 dev_err(dev, "unable to map iobase\n");
 404                 return -ENODEV;
 405         }
 406         /* check version? */
 407         if (readl(iobase + R104_VERSION) != 0x4000) {
 408                 dev_dbg(dev, "no supported mmc controller found\n");
 409                 result = -ENODEV;
 410                 goto unmap_io;
 411         }
 412         /* allocate privdata */
 413         mmc = pcmcia_dev->priv =
 414             mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
 415         if (!mmc) {
 416                 dev_err(dev, "mmc_alloc_host failed\n");
 417                 result = -ENOMEM;
 418                 goto unmap_io;
 419         }
 420         host = mmc_priv(mmc);
 421
 422         host->iobase = iobase;
 423         host->dev = dev;
 424         host->pci_dev = pci_dev;
 425
 426         mmc->ops = &sdricoh_ops;
 427
 428         /* FIXME: frequency and voltage handling is done by the controller
 429          */
 430         mmc->f_min = 450000;
 431         mmc->f_max = 24000000;
 432         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 433         mmc->caps |= MMC_CAP_4_BIT_DATA;
 434
 435         mmc->max_seg_size = 1024 * 512;
 436         mmc->max_blk_size = 512;
 437
 438         /* reset the controller */
 439         if (sdricoh_reset(host)) {
 440                 dev_dbg(dev, "could not reset\n");
 441                 result = -EIO;
 442                 goto free_host;
 443         }
 444
 445         result = mmc_add_host(mmc);
 446
 447         if (!result) {
 448                 dev_dbg(dev, "mmc host registered\n");
 449                 return 0;
 450         }
 451 free_host:
 452         mmc_free_host(mmc);
 453 unmap_io:
 454         pci_iounmap(pci_dev, iobase);
 455         return result;
 456 }
 457
 458 /* search for supported mmc controllers */
 459 static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
 460 {
 461         struct pci_dev *pci_dev = NULL;
 462
 463         dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
 464                 " %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
 465
 466         /* search pci cardbus bridge that contains the mmc controller */
 467         /* the io region is already claimed by yenta_socket... */
 468         while ((pci_dev =
 469                 pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
 470                                pci_dev))) {
 471                 /* try to init the device */
 472                 if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
 473                         dev_info(&pcmcia_dev->dev, "MMC controller found\n");
 474                         return 0;
 475                 }
 476
 477         }
 478         dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
 479         return -ENODEV;
 480 }
 481
 482 static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
 483 {
 484         struct mmc_host *mmc = link->priv;
 485
 486         dev_dbg(&link->dev, "detach\n");
 487
 488         /* remove mmc host */
 489         if (mmc) {
 490                 struct sdricoh_host *host = mmc_priv(mmc);
 491                 mmc_remove_host(mmc);
 492                 pci_iounmap(host->pci_dev, host->iobase);
 493                 pci_dev_put(host->pci_dev);
 494                 mmc_free_host(mmc);
 495         }
 496         pcmcia_disable_device(link);
 497
 498 }
 499
 500 #ifdef CONFIG_PM
 501 static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
 502 {
 503         dev_dbg(&link->dev, "suspend\n");
 504         return 0;
 505 }
 506
 507 static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
 508 {
 509         struct mmc_host *mmc = link->priv;
 510         dev_dbg(&link->dev, "resume\n");
 511         sdricoh_reset(mmc_priv(mmc));
 512         return 0;
 513 }
 514 #else
 515 #define sdricoh_pcmcia_suspend NULL
 516 #define sdricoh_pcmcia_resume NULL
 517 #endif
 518
 519 static struct pcmcia_driver sdricoh_driver = {
 520         .name = DRIVER_NAME,
 521         .probe = sdricoh_pcmcia_probe,
 522         .remove = sdricoh_pcmcia_detach,
 523         .id_table = pcmcia_ids,
 524         .suspend = sdricoh_pcmcia_suspend,
 525         .resume = sdricoh_pcmcia_resume,
 526 };
 527 module_pcmcia_driver(sdricoh_driver);
 528
 529 module_param(switchlocked, uint, 0444);
 530
 531 MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
 532 MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
 533 MODULE_LICENSE("GPL");
 534
 535 MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
 536                 "Use this when unlocked cards are shown readonly (default 0)");