drivers/media/dvb/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 <linux/moduleparam.h>
  36 #include <linux/slab.h>
  37 #include <linux/firmware.h>
  38 #include <linux/delay.h>
  39 #include <linux/mmc/card.h>
  40 #include <linux/mmc/sdio_func.h>
  41 #include <linux/mmc/sdio_ids.h>
  42
  43 #include "smscoreapi.h"
  44 #include "sms-cards.h"
  45
  46 /* Registers */
  47
  48 #define SMSSDIO_DATA            0x00
  49 #define SMSSDIO_INT             0x04
  50 #define SMSSDIO_BLOCK_SIZE      128
  51
  52 static const struct sdio_device_id smssdio_ids[] __devinitconst = {
  53         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_STELLAR),
  54          .driver_data = SMS1XXX_BOARD_SIANO_STELLAR},
  55         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_A0),
  56          .driver_data = SMS1XXX_BOARD_SIANO_NOVA_A},
  57         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_NOVA_B0),
  58          .driver_data = SMS1XXX_BOARD_SIANO_NOVA_B},
  59         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VEGA_A0),
  60          .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
  61         {SDIO_DEVICE(SDIO_VENDOR_ID_SIANO, SDIO_DEVICE_ID_SIANO_VENICE),
  62          .driver_data = SMS1XXX_BOARD_SIANO_VEGA},
  63         { /* end: all zeroes */ },
  64 };
  65
  66 MODULE_DEVICE_TABLE(sdio, smssdio_ids);
  67
  68 struct smssdio_device {
  69         struct sdio_func *func;
  70
  71         struct smscore_device_t *coredev;
  72
  73         struct smscore_buffer_t *split_cb;
  74 };
  75
  76 /*******************************************************************/
  77 /* Siano core callbacks                                            */
  78 /*******************************************************************/
  79
  80 static int smssdio_sendrequest(void *context, void *buffer, size_t size)
  81 {
  82         int ret = 0;
  83         struct smssdio_device *smsdev;
  84
  85         smsdev = context;
  86
  87         sdio_claim_host(smsdev->func);
  88
  89         while (size >= smsdev->func->cur_blksize) {
  90                 ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
  91                                         buffer, smsdev->func->cur_blksize);
  92                 if (ret)
  93                         goto out;
  94
  95                 buffer += smsdev->func->cur_blksize;
  96                 size -= smsdev->func->cur_blksize;
  97         }
  98
  99         if (size) {
 100                 ret = sdio_memcpy_toio(smsdev->func, SMSSDIO_DATA,
 101                                         buffer, size);
 102         }
 103
 104 out:
 105         sdio_release_host(smsdev->func);
 106
 107         return ret;
 108 }
 109
 110 /*******************************************************************/
 111 /* SDIO callbacks                                                  */
 112 /*******************************************************************/
 113
 114 static void smssdio_interrupt(struct sdio_func *func)
 115 {
 116         int ret, isr;
 117
 118         struct smssdio_device *smsdev;
 119         struct smscore_buffer_t *cb;
 120         struct SmsMsgHdr_ST *hdr;
 121         size_t size;
 122
 123         smsdev = sdio_get_drvdata(func);
 124
 125         /*
 126          * The interrupt register has no defined meaning. It is just
 127          * a way of turning of the level triggered interrupt.
 128          */
 129         isr = sdio_readb(func, SMSSDIO_INT, &ret);
 130         if (ret) {
 131                 sms_err("Unable to read interrupt register!\n");
 132                 return;
 133         }
 134
 135         if (smsdev->split_cb == NULL) {
 136                 cb = smscore_getbuffer(smsdev->coredev);
 137                 if (!cb) {
 138                         sms_err("Unable to allocate data buffer!\n");
 139                         return;
 140                 }
 141
 142                 ret = sdio_memcpy_fromio(smsdev->func,
 143                                          cb->p,
 144                                          SMSSDIO_DATA,
 145                                          SMSSDIO_BLOCK_SIZE);
 146                 if (ret) {
 147                         sms_err("Error %d reading initial block!\n", ret);
 148                         return;
 149                 }
 150
 151                 hdr = cb->p;
 152
 153                 if (hdr->msgFlags & MSG_HDR_FLAG_SPLIT_MSG) {
 154                         smsdev->split_cb = cb;
 155                         return;
 156                 }
 157
 158                 if (hdr->msgLength > smsdev->func->cur_blksize)
 159                         size = hdr->msgLength - smsdev->func->cur_blksize;
 160                 else
 161                         size = 0;
 162         } else {
 163                 cb = smsdev->split_cb;
 164                 hdr = cb->p;
 165
 166                 size = hdr->msgLength - sizeof(struct SmsMsgHdr_ST);
 167
 168                 smsdev->split_cb = NULL;
 169         }
 170
 171         if (size) {
 172                 void *buffer;
 173
 174                 buffer = cb->p + (hdr->msgLength - size);
 175                 size = ALIGN(size, SMSSDIO_BLOCK_SIZE);
 176
 177                 BUG_ON(smsdev->func->cur_blksize != SMSSDIO_BLOCK_SIZE);
 178
 179                 /*
 180                  * First attempt to transfer all of it in one go...
 181                  */
 182                 ret = sdio_memcpy_fromio(smsdev->func,
 183                                          buffer,
 184                                          SMSSDIO_DATA,
 185                                          size);
 186                 if (ret && ret != -EINVAL) {
 187                         smscore_putbuffer(smsdev->coredev, cb);
 188                         sms_err("Error %d reading data from card!\n", ret);
 189                         return;
 190                 }
 191
 192                 /*
 193                  * ..then fall back to one block at a time if that is
 194                  * not possible...
 195                  *
 196                  * (we have to do this manually because of the
 197                  * problem with the "increase address" bit)
 198                  */
 199                 if (ret == -EINVAL) {
 200                         while (size) {
 201                                 ret = sdio_memcpy_fromio(smsdev->func,
 202                                                   buffer, SMSSDIO_DATA,
 203                                                   smsdev->func->cur_blksize);
 204                                 if (ret) {
 205                                         smscore_putbuffer(smsdev->coredev, cb);
 206                                         sms_err("Error %d reading "
 207                                                 "data from card!\n", ret);
 208                                         return;
 209                                 }
 210
 211                                 buffer += smsdev->func->cur_blksize;
 212                                 if (size > smsdev->func->cur_blksize)
 213                                         size -= smsdev->func->cur_blksize;
 214                                 else
 215                                         size = 0;
 216                         }
 217                 }
 218         }
 219
 220         cb->size = hdr->msgLength;
 221         cb->offset = 0;
 222
 223         smscore_onresponse(smsdev->coredev, cb);
 224 }
 225
 226 static int __devinit smssdio_probe(struct sdio_func *func,
 227                          const struct sdio_device_id *id)
 228 {
 229         int ret;
 230
 231         int board_id;
 232         struct smssdio_device *smsdev;
 233         struct smsdevice_params_t params;
 234
 235         board_id = id->driver_data;
 236
 237         smsdev = kzalloc(sizeof(struct smssdio_device), GFP_KERNEL);
 238         if (!smsdev)
 239                 return -ENOMEM;
 240
 241         smsdev->func = func;
 242
 243         memset(&params, 0, sizeof(struct smsdevice_params_t));
 244
 245         params.device = &func->dev;
 246         params.buffer_size = 0x5000;    /* ?? */
 247         params.num_buffers = 22;        /* ?? */
 248         params.context = smsdev;
 249
 250         snprintf(params.devpath, sizeof(params.devpath),
 251                  "sdio\\%s", sdio_func_id(func));
 252
 253         params.sendrequest_handler = smssdio_sendrequest;
 254
 255         params.device_type = sms_get_board(board_id)->type;
 256
 257         if (params.device_type != SMS_STELLAR)
 258                 params.flags |= SMS_DEVICE_FAMILY2;
 259         else {
 260                 /*
 261                  * FIXME: Stellar needs special handling...
 262                  */
 263                 ret = -ENODEV;
 264                 goto free;
 265         }
 266
 267         ret = smscore_register_device(&params, &smsdev->coredev);
 268         if (ret < 0)
 269                 goto free;
 270
 271         smscore_set_board_id(smsdev->coredev, board_id);
 272
 273         sdio_claim_host(func);
 274
 275         ret = sdio_enable_func(func);
 276         if (ret)
 277                 goto release;
 278
 279         ret = sdio_set_block_size(func, SMSSDIO_BLOCK_SIZE);
 280         if (ret)
 281                 goto disable;
 282
 283         ret = sdio_claim_irq(func, smssdio_interrupt);
 284         if (ret)
 285                 goto disable;
 286
 287         sdio_set_drvdata(func, smsdev);
 288
 289         sdio_release_host(func);
 290
 291         ret = smscore_start_device(smsdev->coredev);
 292         if (ret < 0)
 293                 goto reclaim;
 294
 295         return 0;
 296
 297 reclaim:
 298         sdio_claim_host(func);
 299         sdio_release_irq(func);
 300 disable:
 301         sdio_disable_func(func);
 302 release:
 303         sdio_release_host(func);
 304         smscore_unregister_device(smsdev->coredev);
 305 free:
 306         kfree(smsdev);
 307
 308         return ret;
 309 }
 310
 311 static void smssdio_remove(struct sdio_func *func)
 312 {
 313         struct smssdio_device *smsdev;
 314
 315         smsdev = sdio_get_drvdata(func);
 316
 317         /* FIXME: racy! */
 318         if (smsdev->split_cb)
 319                 smscore_putbuffer(smsdev->coredev, smsdev->split_cb);
 320
 321         smscore_unregister_device(smsdev->coredev);
 322
 323         sdio_claim_host(func);
 324         sdio_release_irq(func);
 325         sdio_disable_func(func);
 326         sdio_release_host(func);
 327
 328         kfree(smsdev);
 329 }
 330
 331 static struct sdio_driver smssdio_driver = {
 332         .name = "smssdio",
 333         .id_table = smssdio_ids,
 334         .probe = smssdio_probe,
 335         .remove = smssdio_remove,
 336 };
 337
 338 /*******************************************************************/
 339 /* Module functions                                                */
 340 /*******************************************************************/
 341
 342 static int __init smssdio_module_init(void)
 343 {
 344         int ret = 0;
 345
 346         printk(KERN_INFO "smssdio: Siano SMS1xxx SDIO driver\n");
 347         printk(KERN_INFO "smssdio: Copyright Pierre Ossman\n");
 348
 349         ret = sdio_register_driver(&smssdio_driver);
 350
 351         return ret;
 352 }
 353
 354 static void __exit smssdio_module_exit(void)
 355 {
 356         sdio_unregister_driver(&smssdio_driver);
 357 }
 358
 359 module_init(smssdio_module_init);
 360 module_exit(smssdio_module_exit);
 361
 362 MODULE_DESCRIPTION("Siano SMS1xxx SDIO driver");
 363 MODULE_AUTHOR("Pierre Ossman");
 364 MODULE_LICENSE("GPL");