drivers/mmc/host/ushc.c

   1 /*
   2  * USB SD Host Controller (USHC) controller driver.
   3  *
   4  * Copyright (C) 2010 Cambridge Silicon Radio Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * Notes:
  12  *   - Only version 2 devices are supported.
  13  *   - Version 2 devices only support SDIO cards/devices (R2 response is
  14  *     unsupported).
  15  *
  16  * References:
  17  *   [USHC] USB SD Host Controller specification (CS-118793-SP)
  18  */
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/mmc/host.h>
  25
  26 enum ushc_request {
  27         USHC_GET_CAPS  = 0x00,
  28         USHC_HOST_CTRL = 0x01,
  29         USHC_PWR_CTRL  = 0x02,
  30         USHC_CLK_FREQ  = 0x03,
  31         USHC_EXEC_CMD  = 0x04,
  32         USHC_READ_RESP = 0x05,
  33         USHC_RESET     = 0x06,
  34 };
  35
  36 enum ushc_request_type {
  37         USHC_GET_CAPS_TYPE  = USB_DIR_IN  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  38         USHC_HOST_CTRL_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  39         USHC_PWR_CTRL_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  40         USHC_CLK_FREQ_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  41         USHC_EXEC_CMD_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  42         USHC_READ_RESP_TYPE = USB_DIR_IN  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  43         USHC_RESET_TYPE     = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  44 };
  45
  46 #define USHC_GET_CAPS_VERSION_MASK 0xff
  47 #define USHC_GET_CAPS_3V3      (1 << 8)
  48 #define USHC_GET_CAPS_3V0      (1 << 9)
  49 #define USHC_GET_CAPS_1V8      (1 << 10)
  50 #define USHC_GET_CAPS_HIGH_SPD (1 << 16)
  51
  52 #define USHC_HOST_CTRL_4BIT     (1 << 1)
  53 #define USHC_HOST_CTRL_HIGH_SPD (1 << 0)
  54
  55 #define USHC_PWR_CTRL_OFF 0x00
  56 #define USHC_PWR_CTRL_3V3 0x01
  57 #define USHC_PWR_CTRL_3V0 0x02
  58 #define USHC_PWR_CTRL_1V8 0x03
  59
  60 #define USHC_READ_RESP_BUSY        (1 << 4)
  61 #define USHC_READ_RESP_ERR_TIMEOUT (1 << 3)
  62 #define USHC_READ_RESP_ERR_CRC     (1 << 2)
  63 #define USHC_READ_RESP_ERR_DAT     (1 << 1)
  64 #define USHC_READ_RESP_ERR_CMD     (1 << 0)
  65 #define USHC_READ_RESP_ERR_MASK    0x0f
  66
  67 struct ushc_cbw {
  68         __u8 signature;
  69         __u8 cmd_idx;
  70         __le16 block_size;
  71         __le32 arg;
  72 } __attribute__((packed));
  73
  74 #define USHC_CBW_SIGNATURE 'C'
  75
  76 struct ushc_csw {
  77         __u8 signature;
  78         __u8 status;
  79         __le32 response;
  80 } __attribute__((packed));
  81
  82 #define USHC_CSW_SIGNATURE 'S'
  83
  84 struct ushc_int_data {
  85         u8 status;
  86         u8 reserved[3];
  87 };
  88
  89 #define USHC_INT_STATUS_SDIO_INT     (1 << 1)
  90 #define USHC_INT_STATUS_CARD_PRESENT (1 << 0)
  91
  92
  93 struct ushc_data {
  94         struct usb_device *usb_dev;
  95         struct mmc_host *mmc;
  96
  97         struct urb *int_urb;
  98         struct ushc_int_data *int_data;
  99
 100         struct urb *cbw_urb;
 101         struct ushc_cbw *cbw;
 102
 103         struct urb *data_urb;
 104
 105         struct urb *csw_urb;
 106         struct ushc_csw *csw;
 107
 108         spinlock_t lock;
 109         struct mmc_request *current_req;
 110         u32 caps;
 111         u16 host_ctrl;
 112         unsigned long flags;
 113         u8 last_status;
 114         int clock_freq;
 115 };
 116
 117 #define DISCONNECTED    0
 118 #define INT_EN          1
 119 #define IGNORE_NEXT_INT 2
 120
 121 static void data_callback(struct urb *urb);
 122
 123 static int ushc_hw_reset(struct ushc_data *ushc)
 124 {
 125         return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
 126                                USHC_RESET, USHC_RESET_TYPE,
 127                                0, 0, NULL, 0, 100);
 128 }
 129
 130 static int ushc_hw_get_caps(struct ushc_data *ushc)
 131 {
 132         int ret;
 133         int version;
 134
 135         ret = usb_control_msg(ushc->usb_dev, usb_rcvctrlpipe(ushc->usb_dev, 0),
 136                               USHC_GET_CAPS, USHC_GET_CAPS_TYPE,
 137                               0, 0, &ushc->caps, sizeof(ushc->caps), 100);
 138         if (ret < 0)
 139                 return ret;
 140
 141         ushc->caps = le32_to_cpu(ushc->caps);
 142
 143         version = ushc->caps & USHC_GET_CAPS_VERSION_MASK;
 144         if (version != 0x02) {
 145                 dev_err(&ushc->usb_dev->dev, "controller version %d is not supported\n", version);
 146                 return -EINVAL;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int ushc_hw_set_host_ctrl(struct ushc_data *ushc, u16 mask, u16 val)
 153 {
 154         u16 host_ctrl;
 155         int ret;
 156
 157         host_ctrl = (ushc->host_ctrl & ~mask) | val;
 158         ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
 159                               USHC_HOST_CTRL, USHC_HOST_CTRL_TYPE,
 160                               host_ctrl, 0, NULL, 0, 100);
 161         if (ret < 0)
 162                 return ret;
 163         ushc->host_ctrl = host_ctrl;
 164         return 0;
 165 }
 166
 167 static void int_callback(struct urb *urb)
 168 {
 169         struct ushc_data *ushc = urb->context;
 170         u8 status, last_status;
 171
 172         if (urb->status < 0)
 173                 return;
 174
 175         status = ushc->int_data->status;
 176         last_status = ushc->last_status;
 177         ushc->last_status = status;
 178
 179         /*
 180          * Ignore the card interrupt status on interrupt transfers that
 181          * were submitted while card interrupts where disabled.
 182          *
 183          * This avoid occasional spurious interrupts when enabling
 184          * interrupts immediately after clearing the source on the card.
 185          */
 186
 187         if (!test_and_clear_bit(IGNORE_NEXT_INT, &ushc->flags)
 188             && test_bit(INT_EN, &ushc->flags)
 189             && status & USHC_INT_STATUS_SDIO_INT) {
 190                 mmc_signal_sdio_irq(ushc->mmc);
 191         }
 192
 193         if ((status ^ last_status) & USHC_INT_STATUS_CARD_PRESENT)
 194                 mmc_detect_change(ushc->mmc, msecs_to_jiffies(100));
 195
 196         if (!test_bit(INT_EN, &ushc->flags))
 197                 set_bit(IGNORE_NEXT_INT, &ushc->flags);
 198         usb_submit_urb(ushc->int_urb, GFP_ATOMIC);
 199 }
 200
 201 static void cbw_callback(struct urb *urb)
 202 {
 203         struct ushc_data *ushc = urb->context;
 204
 205         if (urb->status != 0) {
 206                 usb_unlink_urb(ushc->data_urb);
 207                 usb_unlink_urb(ushc->csw_urb);
 208         }
 209 }
 210
 211 static void data_callback(struct urb *urb)
 212 {
 213         struct ushc_data *ushc = urb->context;
 214
 215         if (urb->status != 0)
 216                 usb_unlink_urb(ushc->csw_urb);
 217 }
 218
 219 static void csw_callback(struct urb *urb)
 220 {
 221         struct ushc_data *ushc = urb->context;
 222         struct mmc_request *req = ushc->current_req;
 223         int status;
 224
 225         status = ushc->csw->status;
 226
 227         if (urb->status != 0) {
 228                 req->cmd->error = urb->status;
 229         } else if (status & USHC_READ_RESP_ERR_CMD) {
 230                 if (status & USHC_READ_RESP_ERR_CRC)
 231                         req->cmd->error = -EIO;
 232                 else
 233                         req->cmd->error = -ETIMEDOUT;
 234         }
 235         if (req->data) {
 236                 if (status & USHC_READ_RESP_ERR_DAT) {
 237                         if (status & USHC_READ_RESP_ERR_CRC)
 238                                 req->data->error = -EIO;
 239                         else
 240                                 req->data->error = -ETIMEDOUT;
 241                         req->data->bytes_xfered = 0;
 242                 } else {
 243                         req->data->bytes_xfered = req->data->blksz * req->data->blocks;
 244                 }
 245         }
 246
 247         req->cmd->resp[0] = le32_to_cpu(ushc->csw->response);
 248
 249         mmc_request_done(ushc->mmc, req);
 250 }
 251
 252 static void ushc_request(struct mmc_host *mmc, struct mmc_request *req)
 253 {
 254         struct ushc_data *ushc = mmc_priv(mmc);
 255         int ret;
 256         unsigned long flags;
 257
 258         spin_lock_irqsave(&ushc->lock, flags);
 259
 260         if (test_bit(DISCONNECTED, &ushc->flags)) {
 261                 ret = -ENODEV;
 262                 goto out;
 263         }
 264
 265         /* Version 2 firmware doesn't support the R2 response format. */
 266         if (req->cmd->flags & MMC_RSP_136) {
 267                 ret = -EINVAL;
 268                 goto out;
 269         }
 270
 271         /* The Astoria's data FIFOs don't work with clock speeds < 5MHz so
 272            limit commands with data to 6MHz or more. */
 273         if (req->data && ushc->clock_freq < 6000000) {
 274                 ret = -EINVAL;
 275                 goto out;
 276         }
 277
 278         ushc->current_req = req;
 279
 280         /* Start cmd with CBW. */
 281         ushc->cbw->cmd_idx = cpu_to_le16(req->cmd->opcode);
 282         if (req->data)
 283                 ushc->cbw->block_size = cpu_to_le16(req->data->blksz);
 284         else
 285                 ushc->cbw->block_size = 0;
 286         ushc->cbw->arg = cpu_to_le32(req->cmd->arg);
 287
 288         ret = usb_submit_urb(ushc->cbw_urb, GFP_ATOMIC);
 289         if (ret < 0)
 290                 goto out;
 291
 292         /* Submit data (if any). */
 293         if (req->data) {
 294                 struct mmc_data *data = req->data;
 295                 int pipe;
 296
 297                 if (data->flags & MMC_DATA_READ)
 298                         pipe = usb_rcvbulkpipe(ushc->usb_dev, 6);
 299                 else
 300                         pipe = usb_sndbulkpipe(ushc->usb_dev, 2);
 301
 302                 usb_fill_bulk_urb(ushc->data_urb, ushc->usb_dev, pipe,
 303                                   sg_virt(data->sg), data->sg->length,
 304                                   data_callback, ushc);
 305                 ret = usb_submit_urb(ushc->data_urb, GFP_ATOMIC);
 306                 if (ret < 0)
 307                         goto out;
 308         }
 309
 310         /* Submit CSW. */
 311         ret = usb_submit_urb(ushc->csw_urb, GFP_ATOMIC);
 312         if (ret < 0)
 313                 goto out;
 314
 315 out:
 316         spin_unlock_irqrestore(&ushc->lock, flags);
 317         if (ret < 0) {
 318                 usb_unlink_urb(ushc->cbw_urb);
 319                 usb_unlink_urb(ushc->data_urb);
 320                 req->cmd->error = ret;
 321                 mmc_request_done(mmc, req);
 322         }
 323 }
 324
 325 static int ushc_set_power(struct ushc_data *ushc, unsigned char power_mode)
 326 {
 327         u16 voltage;
 328
 329         switch (power_mode) {
 330         case MMC_POWER_OFF:
 331                 voltage = USHC_PWR_CTRL_OFF;
 332                 break;
 333         case MMC_POWER_UP:
 334         case MMC_POWER_ON:
 335                 voltage = USHC_PWR_CTRL_3V3;
 336                 break;
 337         default:
 338                 return -EINVAL;
 339         }
 340
 341         return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
 342                                USHC_PWR_CTRL, USHC_PWR_CTRL_TYPE,
 343                                voltage, 0, NULL, 0, 100);
 344 }
 345
 346 static int ushc_set_bus_width(struct ushc_data *ushc, int bus_width)
 347 {
 348         return ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_4BIT,
 349                                      bus_width == 4 ? USHC_HOST_CTRL_4BIT : 0);
 350 }
 351
 352 static int ushc_set_bus_freq(struct ushc_data *ushc, int clk, bool enable_hs)
 353 {
 354         int ret;
 355
 356         /* Hardware can't detect interrupts while the clock is off. */
 357         if (clk == 0)
 358                 clk = 400000;
 359
 360         ret = ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_HIGH_SPD,
 361                                     enable_hs ? USHC_HOST_CTRL_HIGH_SPD : 0);
 362         if (ret < 0)
 363                 return ret;
 364
 365         ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
 366                               USHC_CLK_FREQ, USHC_CLK_FREQ_TYPE,
 367                               clk & 0xffff, (clk >> 16) & 0xffff, NULL, 0, 100);
 368         if (ret < 0)
 369                 return ret;
 370
 371         ushc->clock_freq = clk;
 372         return 0;
 373 }
 374
 375 static void ushc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 376 {
 377         struct ushc_data *ushc = mmc_priv(mmc);
 378
 379         ushc_set_power(ushc, ios->power_mode);
 380         ushc_set_bus_width(ushc, 1 << ios->bus_width);
 381         ushc_set_bus_freq(ushc, ios->clock, ios->timing == MMC_TIMING_SD_HS);
 382 }
 383
 384 static int ushc_get_cd(struct mmc_host *mmc)
 385 {
 386         struct ushc_data *ushc = mmc_priv(mmc);
 387
 388         return !!(ushc->last_status & USHC_INT_STATUS_CARD_PRESENT);
 389 }
 390
 391 static void ushc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 392 {
 393         struct ushc_data *ushc = mmc_priv(mmc);
 394
 395         if (enable)
 396                 set_bit(INT_EN, &ushc->flags);
 397         else
 398                 clear_bit(INT_EN, &ushc->flags);
 399 }
 400
 401 static void ushc_clean_up(struct ushc_data *ushc)
 402 {
 403         usb_free_urb(ushc->int_urb);
 404         usb_free_urb(ushc->csw_urb);
 405         usb_free_urb(ushc->data_urb);
 406         usb_free_urb(ushc->cbw_urb);
 407
 408         kfree(ushc->int_data);
 409         kfree(ushc->cbw);
 410         kfree(ushc->csw);
 411
 412         mmc_free_host(ushc->mmc);
 413 }
 414
 415 static const struct mmc_host_ops ushc_ops = {
 416         .request         = ushc_request,
 417         .set_ios         = ushc_set_ios,
 418         .get_cd          = ushc_get_cd,
 419         .enable_sdio_irq = ushc_enable_sdio_irq,
 420 };
 421
 422 static int ushc_probe(struct usb_interface *intf, const struct usb_device_id *id)
 423 {
 424         struct usb_device *usb_dev = interface_to_usbdev(intf);
 425         struct mmc_host *mmc;
 426         struct ushc_data *ushc;
 427         int ret;
 428
 429         mmc = mmc_alloc_host(sizeof(struct ushc_data), &intf->dev);
 430         if (mmc == NULL)
 431                 return -ENOMEM;
 432         ushc = mmc_priv(mmc);
 433         usb_set_intfdata(intf, ushc);
 434
 435         ushc->usb_dev = usb_dev;
 436         ushc->mmc = mmc;
 437
 438         spin_lock_init(&ushc->lock);
 439
 440         ret = ushc_hw_reset(ushc);
 441         if (ret < 0)
 442                 goto err;
 443
 444         /* Read capabilities. */
 445         ret = ushc_hw_get_caps(ushc);
 446         if (ret < 0)
 447                 goto err;
 448
 449         mmc->ops = &ushc_ops;
 450
 451         mmc->f_min = 400000;
 452         mmc->f_max = 50000000;
 453         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 454         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
 455         mmc->caps |= (ushc->caps & USHC_GET_CAPS_HIGH_SPD) ? MMC_CAP_SD_HIGHSPEED : 0;
 456
 457         mmc->max_seg_size  = 512*511;
 458         mmc->max_segs      = 1;
 459         mmc->max_req_size  = 512*511;
 460         mmc->max_blk_size  = 512;
 461         mmc->max_blk_count = 511;
 462
 463         ushc->int_urb = usb_alloc_urb(0, GFP_KERNEL);
 464         if (ushc->int_urb == NULL) {
 465                 ret = -ENOMEM;
 466                 goto err;
 467         }
 468         ushc->int_data = kzalloc(sizeof(struct ushc_int_data), GFP_KERNEL);
 469         if (ushc->int_data == NULL) {
 470                 ret = -ENOMEM;
 471                 goto err;
 472         }
 473         usb_fill_int_urb(ushc->int_urb, ushc->usb_dev,
 474                          usb_rcvintpipe(usb_dev,
 475                                         intf->cur_altsetting->endpoint[0].desc.bEndpointAddress),
 476                          ushc->int_data, sizeof(struct ushc_int_data),
 477                          int_callback, ushc,
 478                          intf->cur_altsetting->endpoint[0].desc.bInterval);
 479
 480         ushc->cbw_urb = usb_alloc_urb(0, GFP_KERNEL);
 481         if (ushc->cbw_urb == NULL) {
 482                 ret = -ENOMEM;
 483                 goto err;
 484         }
 485         ushc->cbw = kzalloc(sizeof(struct ushc_cbw), GFP_KERNEL);
 486         if (ushc->cbw == NULL) {
 487                 ret = -ENOMEM;
 488                 goto err;
 489         }
 490         ushc->cbw->signature = USHC_CBW_SIGNATURE;
 491
 492         usb_fill_bulk_urb(ushc->cbw_urb, ushc->usb_dev, usb_sndbulkpipe(usb_dev, 2),
 493                           ushc->cbw, sizeof(struct ushc_cbw),
 494                           cbw_callback, ushc);
 495
 496         ushc->data_urb = usb_alloc_urb(0, GFP_KERNEL);
 497         if (ushc->data_urb == NULL) {
 498                 ret = -ENOMEM;
 499                 goto err;
 500         }
 501
 502         ushc->csw_urb = usb_alloc_urb(0, GFP_KERNEL);
 503         if (ushc->csw_urb == NULL) {
 504                 ret = -ENOMEM;
 505                 goto err;
 506         }
 507         ushc->csw = kzalloc(sizeof(struct ushc_cbw), GFP_KERNEL);
 508         if (ushc->csw == NULL) {
 509                 ret = -ENOMEM;
 510                 goto err;
 511         }
 512         usb_fill_bulk_urb(ushc->csw_urb, ushc->usb_dev, usb_rcvbulkpipe(usb_dev, 6),
 513                           ushc->csw, sizeof(struct ushc_csw),
 514                           csw_callback, ushc);
 515
 516         ret = mmc_add_host(ushc->mmc);
 517         if (ret)
 518                 goto err;
 519
 520         ret = usb_submit_urb(ushc->int_urb, GFP_KERNEL);
 521         if (ret < 0) {
 522                 mmc_remove_host(ushc->mmc);
 523                 goto err;
 524         }
 525
 526         return 0;
 527
 528 err:
 529         ushc_clean_up(ushc);
 530         return ret;
 531 }
 532
 533 static void ushc_disconnect(struct usb_interface *intf)
 534 {
 535         struct ushc_data *ushc = usb_get_intfdata(intf);
 536
 537         spin_lock_irq(&ushc->lock);
 538         set_bit(DISCONNECTED, &ushc->flags);
 539         spin_unlock_irq(&ushc->lock);
 540
 541         usb_kill_urb(ushc->int_urb);
 542         usb_kill_urb(ushc->cbw_urb);
 543         usb_kill_urb(ushc->data_urb);
 544         usb_kill_urb(ushc->csw_urb);
 545
 546         mmc_remove_host(ushc->mmc);
 547
 548         ushc_clean_up(ushc);
 549 }
 550
 551 static struct usb_device_id ushc_id_table[] = {
 552         /* CSR USB SD Host Controller */
 553         { USB_DEVICE(0x0a12, 0x5d10) },
 554         { },
 555 };
 556 MODULE_DEVICE_TABLE(usb, ushc_id_table);
 557
 558 static struct usb_driver ushc_driver = {
 559         .name       = "ushc",
 560         .id_table   = ushc_id_table,
 561         .probe      = ushc_probe,
 562         .disconnect = ushc_disconnect,
 563 };
 564
 565 static int __init ushc_init(void)
 566 {
 567         return usb_register(&ushc_driver);
 568 }
 569 module_init(ushc_init);
 570
 571 static void __exit ushc_exit(void)
 572 {
 573         usb_deregister(&ushc_driver);
 574 }
 575 module_exit(ushc_exit);
 576
 577 MODULE_DESCRIPTION("USB SD Host Controller driver");
 578 MODULE_AUTHOR("David Vrabel <david.vrabel@csr.com>");
 579 MODULE_LICENSE("GPL");