drivers/media/mmc/siano/smssdio.c

   1 /*
   2  *  smssdio.c - Siano 1xxx SDIO interface driver
   3  *
   4  *  Copyright 2008 Pierre Ossman
   5  *
   6  * Based on code by Siano Mobile Silicon, Inc.,
   7  * Copyright (C) 2006-2008, Uri Shkolnik
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or (at
  12  * your option) any later version.
  13  *
  14  *
  15  * This hardware is a bit odd in that all transfers should be done
  16  * to/from the SMSSDIO_DATA register, yet the "increase address" bit
  17  * always needs to be set.
  18  *
  19  * Also, buffers from the card are always aligned to 128 byte
  20  * boundaries.
  21  */
  22
  23 /*
  24  * General cleanup notes:
  25  *
  26  * - only typedefs should be name *_t
  27  *
  28  * - use ERR_PTR and friends for smscore_register_device()
  29  *
  30  * - smscore_getbuffer should zero fields
  31  *
  32  * Fix stop command
  33  */
  34
  35 #include "smscoreapi.h"
  36
  37 #include <linux/moduleparam.h>
  38 #include <linux/slab.h>
  39 #include <linux/firmware.h>
  40 #include <linux/delay.h>
  41 #include <linux/mmc/card.h>
  42 #include <linux/mmc/sdio_func.h>
  43 #include <linux/mmc/sdio_ids.h>
  44 #include <linux/module.h>
  45
  46 #include "sms-cards.h"
  47 #include "smsendian.h"
  48
  49 /* Registers */
  50
  51 #define SMSSDIO_DATA            0x00
  52 #define SMSSDIO_INT             0x04
  53 #define SMSSDIO_BLOCK_SIZE      128
  54
  55 static const struct sdio_device_id smssdio_ids[] = {
  56         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_STELLAR),
  57          .driver_data = SMS1XXX_BOARD_SIANO_STELLAR},
  58         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_A0),
  59          .driver_data = SMS1XXX_BOARD_SIANO_NOVA_A},
  60         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_B0),
  61          .driver_data = SMS1XXX_BOARD_SIANO_NOVA_B},
  62         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VEGA_A0),
  63          .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
  64         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VENICE),
  65          .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
  66         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, 0x302),
  67         .driver_data = SMS1XXX_BOARD_SIANO_MING},
  68         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, 0x500),
  69         .driver_data = SMS1XXX_BOARD_SIANO_PELE},
  70         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, 0x600),
  71         .driver_data = SMS1XXX_BOARD_SIANO_RIO},
  72         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, 0x700),
  73         .driver_data = SMS1XXX_BOARD_SIANO_DENVER_2160},
  74         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, 0x800),
  75         .driver_data = SMS1XXX_BOARD_SIANO_DENVER_1530},
  76         { /* end: all zeroes */ },
  77 };
  78
  79 MODULE_DEVICE_TABLE(sdio, smssdio_ids);
  80
  81 struct smssdio_device {
  82         struct sdio_func *func;
  83
  84         struct smscore_device_t *coredev;
  85
  86         struct smscore_buffer_t *split_cb;
  87 };
  88
  89 /*******************************************************************/
  90 /* Siano core callbacks                                            */
  91 /*******************************************************************/
  92
  93 static int smssdio_sendrequest(void *context, void *buffer, size_t size)
  94 {
  95         int ret = 0;
  96         struct smssdio_device *smsdev;
  97
  98         smsdev = context;
  99
 100         sdio_claim_host(smsdev->func);
 101
 102         smsendian_handle_tx_message((struct sms_msg_data *) buffer);
 103         while (size >= smsdev->func->cur_blksize) {
 104                 ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
 105                                         buffer, smsdev->func->cur_blksize);
 106                 if (ret)
 107                         goto out;
 108
 109                 buffer += smsdev->func->cur_blksize;
 110                 size -= smsdev->func->cur_blksize;
 111         }
 112
 113         if (size) {
 114                 ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
 115                                         buffer, size);
 116         }
 117
 118 out:
 119         sdio_release_host(smsdev->func);
 120
 121         return ret;
 122 }
 123
 124 /*******************************************************************/
 125 /* SDIO callbacks                                                  */
 126 /*******************************************************************/
 127
 128 static void smssdio_interrupt(struct sdio_func *func)
 129 {
 130         int ret;
 131
 132         struct smssdio_device *smsdev;
 133         struct smscore_buffer_t *cb;
 134         struct sms_msg_hdr *hdr;
 135         size_t size;
 136
 137         smsdev = sdio_get_drvdata(func);
 138
 139         /*
 140          * The interrupt register has no defined meaning. It is just
 141          * a way of turning of the level triggered interrupt.
 142          */
 143         (void)sdio_readb(func, SMSSDIO_INT, &ret);
 144         if (ret) {
 145                 pr_err("Unable to read interrupt register!\n");
 146                 return;
 147         }
 148
 149         if (smsdev->split_cb == NULL) {
 150                 cb = smscore_getbuffer(smsdev->coredev);
 151                 if (!cb) {
 152                         pr_err("Unable to allocate data buffer!\n");
 153                         return;
 154                 }
 155
 156                 ret = sdio_memcpy_fromio(smsdev->func,
 157                                          cb->p,
 158                                          SMSSDIO_DATA,
 159                                          SMSSDIO_BLOCK_SIZE);
 160                 if (ret) {
 161                         pr_err("Error %d reading initial block!\n", ret);
 162                         return;
 163                 }
 164
 165                 hdr = cb->p;
 166
 167                 if (hdr->msg_flags & MSG_HDR_FLAG_SPLIT_MSG) {
 168                         smsdev->split_cb = cb;
 169                         return;
 170                 }
 171
 172                 if (hdr->msg_length > smsdev->func->cur_blksize)
 173                         size = hdr->msg_length - smsdev->func->cur_blksize;
 174                 else
 175                         size = 0;
 176         } else {
 177                 cb = smsdev->split_cb;
 178                 hdr = cb->p;
 179
 180                 size = hdr->msg_length - sizeof(struct sms_msg_hdr);
 181
 182                 smsdev->split_cb = NULL;
 183         }
 184
 185         if (size) {
 186                 void *buffer;
 187
 188                 buffer = cb->p + (hdr->msg_length - size);
 189                 size = ALIGN(size, SMSSDIO_BLOCK_SIZE);
 190
 191                 BUG_ON(smsdev->func->cur_blksize != SMSSDIO_BLOCK_SIZE);
 192
 193                 /*
 194                  * First attempt to transfer all of it in one go...
 195                  */
 196                 ret = sdio_memcpy_fromio(smsdev->func,
 197                                          buffer,
 198                                          SMSSDIO_DATA,
 199                                          size);
 200                 if (ret && ret != -EINVAL) {
 201                         smscore_putbuffer(smsdev->coredev, cb);
 202                         pr_err("Error %d reading data from card!\n", ret);
 203                         return;
 204                 }
 205
 206                 /*
 207                  * ..then fall back to one block at a time if that is
 208                  * not possible...
 209                  *
 210                  * (we have to do this manually because of the
 211                  * problem with the "increase address" bit)
 212                  */
 213                 if (ret == -EINVAL) {
 214                         while (size) {
 215                                 ret = sdio_memcpy_fromio(smsdev->func,
 216                                                   buffer, SMSSDIO_DATA,
 217                                                   smsdev->func->cur_blksize);
 218                                 if (ret) {
 219                                         smscore_putbuffer(smsdev->coredev, cb);
 220                                         pr_err("Error %d reading data from card!\n",
 221                                                ret);
 222                                         return;
 223                                 }
 224
 225                                 buffer += smsdev->func->cur_blksize;
 226                                 if (size > smsdev->func->cur_blksize)
 227                                         size -= smsdev->func->cur_blksize;
 228                                 else
 229                                         size = 0;
 230                         }
 231                 }
 232         }
 233
 234         cb->size = hdr->msg_length;
 235         cb->offset = 0;
 236
 237         smsendian_handle_rx_message((struct sms_msg_data *) cb->p);
 238         smscore_onresponse(smsdev->coredev, cb);
 239 }
 240
 241 static int smssdio_probe(struct sdio_func *func,
 242                          const struct sdio_device_id *id)
 243 {
 244         int ret;
 245
 246         int board_id;
 247         struct smssdio_device *smsdev;
 248         struct smsdevice_params_t params;
 249
 250         board_id = id->driver_data;
 251
 252         smsdev = kzalloc(sizeof(struct smssdio_device), GFP_KERNEL);
 253         if (!smsdev)
 254                 return -ENOMEM;
 255
 256         smsdev->func = func;
 257
 258         memset(&params, 0, sizeof(struct smsdevice_params_t));
 259
 260         params.device = &func->dev;
 261         params.buffer_size = 0x5000;    /* ?? */
 262         params.num_buffers = 22;        /* ?? */
 263         params.context = smsdev;
 264
 265         snprintf(params.devpath, sizeof(params.devpath),
 266                  "sdio\\%s", sdio_func_id(func));
 267
 268         params.sendrequest_handler = smssdio_sendrequest;
 269
 270         params.device_type = sms_get_board(board_id)->type;
 271
 272         if (params.device_type != SMS_STELLAR)
 273                 params.flags |= SMS_DEVICE_FAMILY2;
 274         else {
 275                 /*
 276                  * FIXME: Stellar needs special handling...
 277                  */
 278                 ret = -ENODEV;
 279                 goto free;
 280         }
 281
 282         ret = smscore_register_device(&params, &smsdev->coredev, NULL);
 283         if (ret < 0)
 284                 goto free;
 285
 286         smscore_set_board_id(smsdev->coredev, board_id);
 287
 288         sdio_claim_host(func);
 289
 290         ret = sdio_enable_func(func);
 291         if (ret)
 292                 goto release;
 293
 294         ret = sdio_set_block_size(func, SMSSDIO_BLOCK_SIZE);
 295         if (ret)
 296                 goto disable;
 297
 298         ret = sdio_claim_irq(func, smssdio_interrupt);
 299         if (ret)
 300                 goto disable;
 301
 302         sdio_set_drvdata(func, smsdev);
 303
 304         sdio_release_host(func);
 305
 306         ret = smscore_start_device(smsdev->coredev);
 307         if (ret < 0)
 308                 goto reclaim;
 309
 310         return 0;
 311
 312 reclaim:
 313         sdio_claim_host(func);
 314         sdio_release_irq(func);
 315 disable:
 316         sdio_disable_func(func);
 317 release:
 318         sdio_release_host(func);
 319         smscore_unregister_device(smsdev->coredev);
 320 free:
 321         kfree(smsdev);
 322
 323         return ret;
 324 }
 325
 326 static void smssdio_remove(struct sdio_func *func)
 327 {
 328         struct smssdio_device *smsdev;
 329
 330         smsdev = sdio_get_drvdata(func);
 331
 332         /* FIXME: racy! */
 333         if (smsdev->split_cb)
 334                 smscore_putbuffer(smsdev->coredev, smsdev->split_cb);
 335
 336         smscore_unregister_device(smsdev->coredev);
 337
 338         sdio_claim_host(func);
 339         sdio_release_irq(func);
 340         sdio_disable_func(func);
 341         sdio_release_host(func);
 342
 343         kfree(smsdev);
 344 }
 345
 346 static struct sdio_driver smssdio_driver = {
 347         .name = "smssdio",
 348         .id_table = smssdio_ids,
 349         .probe = smssdio_probe,
 350         .remove = smssdio_remove,
 351 };
 352
 353 /*******************************************************************/
 354 /* Module functions                                                */
 355 /*******************************************************************/
 356
 357 static int __init smssdio_module_init(void)
 358 {
 359         int ret = 0;
 360
 361         printk(KERN_INFO "smssdio: Siano SMS1xxx SDIO driver\n");
 362         printk(KERN_INFO "smssdio: Copyright Pierre Ossman\n");
 363
 364         ret = sdio_register_driver(&smssdio_driver);
 365
 366         return ret;
 367 }
 368
 369 static void __exit smssdio_module_exit(void)
 370 {
 371         sdio_unregister_driver(&smssdio_driver);
 372 }
 373
 374 module_init(smssdio_module_init);
 375 module_exit(smssdio_module_exit);
 376
 377 MODULE_DESCRIPTION("Siano SMS1xxx SDIO driver");
 378 MODULE_AUTHOR("Pierre Ossman");
 379 MODULE_LICENSE("GPL");