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 < min_size)
 181                 return -EINVAL;
 182
 183         /* TPLFE_MAX_BLK_SIZE */
 184         func->max_blksize = buf[12] | (buf[13] << 8);
 185
 186         /* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */
 187         if (vsn > SDIO_SDIO_REV_1_00)
 188                 func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10;
 189         else
 190                 func->enable_timeout = jiffies_to_msecs(HZ);
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * Known TPLFE_TYPEs table for CISTPL_FUNCE tuples.
 197  *
 198  * Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending
 199  * on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO
 200  * TPLFID_FUNCTION is always hardcoded to 0x0C.
 201  */
 202 static const struct cis_tpl cis_tpl_funce_list[] = {
 203         {       0x00,   4,      cistpl_funce_common             },
 204         {       0x01,   0,      cistpl_funce_func               },
 205         {       0x04,   1+1+6,  /* CISTPL_FUNCE_LAN_NODE_ID */  },
 206 };
 207
 208 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
 209                         const unsigned char *buf, unsigned size)
 210 {
 211         if (size < 1)
 212                 return -EINVAL;
 213
 214         return cis_tpl_parse(card, func, "CISTPL_FUNCE",
 215                              cis_tpl_funce_list,
 216                              ARRAY_SIZE(cis_tpl_funce_list),
 217                              buf[0], buf, size);
 218 }
 219
 220 /* Known TPL_CODEs table for CIS tuples */
 221 static const struct cis_tpl cis_tpl_list[] = {
 222         {       0x15,   3,      cistpl_vers_1           },
 223         {       0x20,   4,      cistpl_manfid           },
 224         {       0x21,   2,      /* cistpl_funcid */     },
 225         {       0x22,   0,      cistpl_funce            },
 226 };
 227
 228 static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
 229 {
 230         int ret;
 231         struct sdio_func_tuple *this, **prev;
 232         unsigned i, ptr = 0;
 233
 234         /*
 235          * Note that this works for the common CIS (function number 0) as
 236          * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
 237          * have the same offset.
 238          */
 239         for (i = 0; i < 3; i++) {
 240                 unsigned char x, fn;
 241
 242                 if (func)
 243                         fn = func->num;
 244                 else
 245                         fn = 0;
 246
 247                 ret = mmc_io_rw_direct(card, 0, 0,
 248                         SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
 249                 if (ret)
 250                         return ret;
 251                 ptr |= x << (i * 8);
 252         }
 253
 254         if (func)
 255                 prev = &func->tuples;
 256         else
 257                 prev = &card->tuples;
 258
 259         BUG_ON(*prev);
 260
 261         do {
 262                 unsigned char tpl_code, tpl_link;
 263
 264                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
 265                 if (ret)
 266                         break;
 267
 268                 /* 0xff means we're done */
 269                 if (tpl_code == 0xff)
 270                         break;
 271
 272                 /* null entries have no link field or data */
 273                 if (tpl_code == 0x00)
 274                         continue;
 275
 276                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
 277                 if (ret)
 278                         break;
 279
 280                 /* a size of 0xff also means we're done */
 281                 if (tpl_link == 0xff)
 282                         break;
 283
 284                 this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
 285                 if (!this)
 286                         return -ENOMEM;
 287
 288                 for (i = 0; i < tpl_link; i++) {
 289                         ret = mmc_io_rw_direct(card, 0, 0,
 290                                                ptr + i, 0, &this->data[i]);
 291                         if (ret)
 292                                 break;
 293                 }
 294                 if (ret) {
 295                         kfree(this);
 296                         break;
 297                 }
 298
 299                 /* Try to parse the CIS tuple */
 300                 ret = cis_tpl_parse(card, func, "CIS",
 301                                     cis_tpl_list, ARRAY_SIZE(cis_tpl_list),
 302                                     tpl_code, this->data, tpl_link);
 303                 if (ret == -EILSEQ || ret == -ENOENT) {
 304                         /*
 305                          * The tuple is unknown or known but not parsed.
 306                          * Queue the tuple for the function driver.
 307                          */
 308                         this->next = NULL;
 309                         this->code = tpl_code;
 310                         this->size = tpl_link;
 311                         *prev = this;
 312                         prev = &this->next;
 313
 314                         if (ret == -ENOENT) {
 315                                 /* warn about unknown tuples */
 316                                 pr_warn_ratelimited("%s: queuing unknown"
 317                                        " CIS tuple 0x%02x (%u bytes)\n",
 318                                        mmc_hostname(card->host),
 319                                        tpl_code, tpl_link);
 320                         }
 321
 322                         /* keep on analyzing tuples */
 323                         ret = 0;
 324                 } else {
 325                         /*
 326                          * We don't need the tuple anymore if it was
 327                          * successfully parsed by the SDIO core or if it is
 328                          * not going to be queued for a driver.
 329                          */
 330                         kfree(this);
 331                 }
 332
 333                 ptr += tpl_link;
 334         } while (!ret);
 335
 336         /*
 337          * Link in all unknown tuples found in the common CIS so that
 338          * drivers don't have to go digging in two places.
 339          */
 340         if (func)
 341                 *prev = card->tuples;
 342
 343         return ret;
 344 }
 345
 346 int sdio_read_common_cis(struct mmc_card *card)
 347 {
 348         return sdio_read_cis(card, NULL);
 349 }
 350
 351 void sdio_free_common_cis(struct mmc_card *card)
 352 {
 353         struct sdio_func_tuple *tuple, *victim;
 354
 355         tuple = card->tuples;
 356
 357         while (tuple) {
 358                 victim = tuple;
 359                 tuple = tuple->next;
 360                 kfree(victim);
 361         }
 362
 363         card->tuples = NULL;
 364 }
 365
 366 int sdio_read_func_cis(struct sdio_func *func)
 367 {
 368         int ret;
 369
 370         ret = sdio_read_cis(func->card, func);
 371         if (ret)
 372                 return ret;
 373
 374         /*
 375          * Since we've linked to tuples in the card structure,
 376          * we must make sure we have a reference to it.
 377          */
 378         get_device(&func->card->dev);
 379
 380         /*
 381          * Vendor/device id is optional for function CIS, so
 382          * copy it from the card structure as needed.
 383          */
 384         if (func->vendor == 0) {
 385                 func->vendor = func->card->cis.vendor;
 386                 func->device = func->card->cis.device;
 387         }
 388
 389         return 0;
 390 }
 391
 392 void sdio_free_func_cis(struct sdio_func *func)
 393 {
 394         struct sdio_func_tuple *tuple, *victim;
 395
 396         tuple = func->tuples;
 397
 398         while (tuple && tuple != func->card->tuples) {
 399                 victim = tuple;
 400                 tuple = tuple->next;
 401                 kfree(victim);
 402         }
 403
 404         func->tuples = NULL;
 405
 406         /*
 407          * We have now removed the link to the tuples in the
 408          * card structure, so remove the reference.
 409          */
 410         put_device(&func->card->dev);
 411 }
 412