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