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