drivers/mmc/core/sdio_cis.c

   1 /*
   2  * linux/drivers/mmc/core/sdio_cis.c
   3  *
   4  * Author:      Nicolas Pitre
   5  * Created:     June 11, 2007
   6  * Copyright:   MontaVista Software Inc.
   7  *
   8  * Copyright 2007 Pierre Ossman
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/card.h>
  21 #include <linux/mmc/sdio.h>
  22 #include <linux/mmc/sdio_func.h>
  23
  24 #include "sdio_cis.h"
  25 #include "sdio_ops.h"
  26
  27 static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
  28                          const unsigned char *buf, unsigned size)
  29 {
  30         unsigned i, nr_strings;
  31         char **buffer, *string;
  32
  33         /* Find all null-terminated (including zero length) strings in
  34            the TPLLV1_INFO field. Trailing garbage is ignored. */
  35         buf += 2;
  36         size -= 2;
  37
  38         nr_strings = 0;
  39         for (i = 0; i < size; i++) {
  40                 if (buf[i] == 0xff)
  41                         break;
  42                 if (buf[i] == 0)
  43                         nr_strings++;
  44         }
  45         if (nr_strings == 0)
  46                 return 0;
  47
  48         size = i;
  49
  50         buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL);
  51         if (!buffer)
  52                 return -ENOMEM;
  53
  54         string = (char*)(buffer + nr_strings);
  55
  56         for (i = 0; i < nr_strings; i++) {
  57                 buffer[i] = string;
  58                 strcpy(string, buf);
  59                 string += strlen(string) + 1;
  60                 buf += strlen(buf) + 1;
  61         }
  62
  63         if (func) {
  64                 func->num_info = nr_strings;
  65                 func->info = (const char**)buffer;
  66         } else {
  67                 card->num_info = nr_strings;
  68                 card->info = (const char**)buffer;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
  75                          const unsigned char *buf, unsigned size)
  76 {
  77         unsigned int vendor, device;
  78
  79         /* TPLMID_MANF */
  80         vendor = buf[0] | (buf[1] << 8);
  81
  82         /* TPLMID_CARD */
  83         device = buf[2] | (buf[3] << 8);
  84
  85         if (func) {
  86                 func->vendor = vendor;
  87                 func->device = device;
  88         } else {
  89                 card->cis.vendor = vendor;
  90                 card->cis.device = device;
  91         }
  92
  93         return 0;
  94 }
  95
  96 static const unsigned char speed_val[16] =
  97         { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
  98 static const unsigned int speed_unit[8] =
  99         { 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
 100
 101
 102 typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
 103                            const unsigned char *, unsigned);
 104
 105 struct cis_tpl {
 106         unsigned char code;
 107         unsigned char min_size;
 108         tpl_parse_t *parse;
 109 };
 110
 111 static int cis_tpl_parse(struct mmc_card *card, struct sdio_func *func,
 112                          const char *tpl_descr,
 113                          const struct cis_tpl *tpl, int tpl_count,
 114                          unsigned char code,
 115                          const unsigned char *buf, unsigned size)
 116 {
 117         int i, ret;
 118
 119         /* look for a matching code in the table */
 120         for (i = 0; i < tpl_count; i++, tpl++) {
 121                 if (tpl->code == code)
 122                         break;
 123         }
 124         if (i < tpl_count) {
 125                 if (size >= tpl->min_size) {
 126                         if (tpl->parse)
 127                                 ret = tpl->parse(card, func, buf, size);
 128                         else
 129                                 ret = -EILSEQ;  /* known tuple, not parsed */
 130                 } else {
 131                         /* invalid tuple */
 132                         ret = -EINVAL;
 133                 }
 134                 if (ret && ret != -EILSEQ && ret != -ENOENT) {
 135                         pr_err("%s: bad %s tuple 0x%02x (%u bytes)\n",
 136                                mmc_hostname(card->host), tpl_descr, code, size);
 137                 }
 138         } else {
 139                 /* unknown tuple */
 140                 ret = -ENOENT;
 141         }
 142
 143         return ret;
 144 }
 145
 146 static int cistpl_funce_common(struct mmc_card *card, struct sdio_func *func,
 147                                const unsigned char *buf, unsigned size)
 148 {
 149         /* Only valid for the common CIS (function 0) */
 150         if (func)
 151                 return -EINVAL;
 152
 153         /* TPLFE_FN0_BLK_SIZE */
 154         card->cis.blksize = buf[1] | (buf[2] << 8);
 155
 156         /* TPLFE_MAX_TRAN_SPEED */
 157         card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
 158                             speed_unit[buf[3] & 7];
 159
 160         return 0;
 161 }
 162
 163 static int cistpl_funce_func(struct mmc_card *card, struct sdio_func *func,
 164                              const unsigned char *buf, unsigned size)
 165 {
 166         unsigned vsn;
 167         unsigned min_size;
 168
 169         /* Only valid for the individual function's CIS (1-7) */
 170         if (!func)
 171                 return -EINVAL;
 172
 173         /*
 174          * This tuple has a different length depending on the SDIO spec
 175          * version.
 176          */
 177         vsn = func->card->cccr.sdio_vsn;
 178         min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
 179
 180         if (size == 28 && vsn == SDIO_SDIO_REV_1_10) {
 181                 pr_warn("%s: card has broken SDIO 1.1 CIS, forcing SDIO 1.0\n",
 182                         mmc_hostname(card->host));
 183                 vsn = SDIO_SDIO_REV_1_00;
 184         } else if (size < min_size) {
 185                 return -EINVAL;
 186         }
 187
 188         /* TPLFE_MAX_BLK_SIZE */
 189         func->max_blksize = buf[12] | (buf[13] << 8);
 190
 191         /* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */
 192         if (vsn > SDIO_SDIO_REV_1_00)
 193                 func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10;
 194         else
 195                 func->enable_timeout = jiffies_to_msecs(HZ);
 196
 197         return 0;
 198 }
 199
 200 /*
 201  * Known TPLFE_TYPEs table for CISTPL_FUNCE tuples.
 202  *
 203  * Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending
 204  * on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO
 205  * TPLFID_FUNCTION is always hardcoded to 0x0C.
 206  */
 207 static const struct cis_tpl cis_tpl_funce_list[] = {
 208         {       0x00,   4,      cistpl_funce_common             },
 209         {       0x01,   0,      cistpl_funce_func               },
 210         {       0x04,   1+1+6,  /* CISTPL_FUNCE_LAN_NODE_ID */  },
 211 };
 212
 213 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
 214                         const unsigned char *buf, unsigned size)
 215 {
 216         if (size < 1)
 217                 return -EINVAL;
 218
 219         return cis_tpl_parse(card, func, "CISTPL_FUNCE",
 220                              cis_tpl_funce_list,
 221                              ARRAY_SIZE(cis_tpl_funce_list),
 222                              buf[0], buf, size);
 223 }
 224
 225 /* Known TPL_CODEs table for CIS tuples */
 226 static const struct cis_tpl cis_tpl_list[] = {
 227         {       0x15,   3,      cistpl_vers_1           },
 228         {       0x20,   4,      cistpl_manfid           },
 229         {       0x21,   2,      /* cistpl_funcid */     },
 230         {       0x22,   0,      cistpl_funce            },
 231         {       0x91,   2,      /* cistpl_sdio_std */   },
 232 };
 233
 234 static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
 235 {
 236         int ret;
 237         struct sdio_func_tuple *this, **prev;
 238         unsigned i, ptr = 0;
 239
 240         /*
 241          * Note that this works for the common CIS (function number 0) as
 242          * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
 243          * have the same offset.
 244          */
 245         for (i = 0; i < 3; i++) {
 246                 unsigned char x, fn;
 247
 248                 if (func)
 249                         fn = func->num;
 250                 else
 251                         fn = 0;
 252
 253                 ret = mmc_io_rw_direct(card, 0, 0,
 254                         SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
 255                 if (ret)
 256                         return ret;
 257                 ptr |= x << (i * 8);
 258         }
 259
 260         if (func)
 261                 prev = &func->tuples;
 262         else
 263                 prev = &card->tuples;
 264
 265         if (*prev)
 266                 return -EINVAL;
 267
 268         do {
 269                 unsigned char tpl_code, tpl_link;
 270
 271                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
 272                 if (ret)
 273                         break;
 274
 275                 /* 0xff means we're done */
 276                 if (tpl_code == 0xff)
 277                         break;
 278
 279                 /* null entries have no link field or data */
 280                 if (tpl_code == 0x00)
 281                         continue;
 282
 283                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
 284                 if (ret)
 285                         break;
 286
 287                 /* a size of 0xff also means we're done */
 288                 if (tpl_link == 0xff)
 289                         break;
 290
 291                 this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
 292                 if (!this)
 293                         return -ENOMEM;
 294
 295                 for (i = 0; i < tpl_link; i++) {
 296                         ret = mmc_io_rw_direct(card, 0, 0,
 297                                                ptr + i, 0, &this->data[i]);
 298                         if (ret)
 299                                 break;
 300                 }
 301                 if (ret) {
 302                         kfree(this);
 303                         break;
 304                 }
 305
 306                 /* Try to parse the CIS tuple */
 307                 ret = cis_tpl_parse(card, func, "CIS",
 308                                     cis_tpl_list, ARRAY_SIZE(cis_tpl_list),
 309                                     tpl_code, this->data, tpl_link);
 310                 if (ret == -EILSEQ || ret == -ENOENT) {
 311                         /*
 312                          * The tuple is unknown or known but not parsed.
 313                          * Queue the tuple for the function driver.
 314                          */
 315                         this->next = NULL;
 316                         this->code = tpl_code;
 317                         this->size = tpl_link;
 318                         *prev = this;
 319                         prev = &this->next;
 320
 321                         if (ret == -ENOENT) {
 322                                 /* warn about unknown tuples */
 323                                 pr_warn_ratelimited("%s: queuing unknown"
 324                                        " CIS tuple 0x%02x (%u bytes)\n",
 325                                        mmc_hostname(card->host),
 326                                        tpl_code, tpl_link);
 327                         }
 328
 329                         /* keep on analyzing tuples */
 330                         ret = 0;
 331                 } else {
 332                         /*
 333                          * We don't need the tuple anymore if it was
 334                          * successfully parsed by the SDIO core or if it is
 335                          * not going to be queued for a driver.
 336                          */
 337                         kfree(this);
 338                 }
 339
 340                 ptr += tpl_link;
 341         } while (!ret);
 342
 343         /*
 344          * Link in all unknown tuples found in the common CIS so that
 345          * drivers don't have to go digging in two places.
 346          */
 347         if (func)
 348                 *prev = card->tuples;
 349
 350         return ret;
 351 }
 352
 353 int sdio_read_common_cis(struct mmc_card *card)
 354 {
 355         return sdio_read_cis(card, NULL);
 356 }
 357
 358 void sdio_free_common_cis(struct mmc_card *card)
 359 {
 360         struct sdio_func_tuple *tuple, *victim;
 361
 362         tuple = card->tuples;
 363
 364         while (tuple) {
 365                 victim = tuple;
 366                 tuple = tuple->next;
 367                 kfree(victim);
 368         }
 369
 370         card->tuples = NULL;
 371 }
 372
 373 int sdio_read_func_cis(struct sdio_func *func)
 374 {
 375         int ret;
 376
 377         ret = sdio_read_cis(func->card, func);
 378         if (ret)
 379                 return ret;
 380
 381         /*
 382          * Since we've linked to tuples in the card structure,
 383          * we must make sure we have a reference to it.
 384          */
 385         get_device(&func->card->dev);
 386
 387         /*
 388          * Vendor/device id is optional for function CIS, so
 389          * copy it from the card structure as needed.
 390          */
 391         if (func->vendor == 0) {
 392                 func->vendor = func->card->cis.vendor;
 393                 func->device = func->card->cis.device;
 394         }
 395
 396         return 0;
 397 }
 398
 399 void sdio_free_func_cis(struct sdio_func *func)
 400 {
 401         struct sdio_func_tuple *tuple, *victim;
 402
 403         tuple = func->tuples;
 404
 405         while (tuple && tuple != func->card->tuples) {
 406                 victim = tuple;
 407                 tuple = tuple->next;
 408                 kfree(victim);
 409         }
 410
 411         func->tuples = NULL;
 412
 413         /*
 414          * We have now removed the link to the tuples in the
 415          * card structure, so remove the reference.
 416          */
 417         put_device(&func->card->dev);
 418 }
 419