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         buf += 2;
  33         size -= 2;
  34
  35         nr_strings = 0;
  36         for (i = 0; i < size; i++) {
  37                 if (buf[i] == 0xff)
  38                         break;
  39                 if (buf[i] == 0)
  40                         nr_strings++;
  41         }
  42
  43         if (buf[i-1] != '\0') {
  44                 printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
  45                 return 0;
  46         }
  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 static int cistpl_funce_common(struct mmc_card *card,
 102                                const unsigned char *buf, unsigned size)
 103 {
 104         if (size < 0x04 || buf[0] != 0)
 105                 return -EINVAL;
 106
 107         /* TPLFE_FN0_BLK_SIZE */
 108         card->cis.blksize = buf[1] | (buf[2] << 8);
 109
 110         /* TPLFE_MAX_TRAN_SPEED */
 111         card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
 112                             speed_unit[buf[3] & 7];
 113
 114         return 0;
 115 }
 116
 117 static int cistpl_funce_func(struct sdio_func *func,
 118                              const unsigned char *buf, unsigned size)
 119 {
 120         unsigned vsn;
 121         unsigned min_size;
 122
 123         vsn = func->card->cccr.sdio_vsn;
 124         min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
 125
 126         if (size < min_size || buf[0] != 1)
 127                 return -EINVAL;
 128
 129         /* TPLFE_MAX_BLK_SIZE */
 130         func->max_blksize = buf[12] | (buf[13] << 8);
 131
 132         return 0;
 133 }
 134
 135 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
 136                         const unsigned char *buf, unsigned size)
 137 {
 138         int ret;
 139
 140         /*
 141          * There should be two versions of the CISTPL_FUNCE tuple,
 142          * one for the common CIS (function 0) and a version used by
 143          * the individual function's CIS (1-7). Yet, the later has a
 144          * different length depending on the SDIO spec version.
 145          */
 146         if (func)
 147                 ret = cistpl_funce_func(func, buf, size);
 148         else
 149                 ret = cistpl_funce_common(card, buf, size);
 150
 151         if (ret) {
 152                 printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "
 153                        "type %u\n", mmc_hostname(card->host), size, buf[0]);
 154                 return ret;
 155         }
 156
 157         return 0;
 158 }
 159
 160 typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
 161                            const unsigned char *, unsigned);
 162
 163 struct cis_tpl {
 164         unsigned char code;
 165         unsigned char min_size;
 166         tpl_parse_t *parse;
 167 };
 168
 169 static const struct cis_tpl cis_tpl_list[] = {
 170         {       0x15,   3,      cistpl_vers_1           },
 171         {       0x20,   4,      cistpl_manfid           },
 172         {       0x21,   2,      /* cistpl_funcid */     },
 173         {       0x22,   0,      cistpl_funce            },
 174 };
 175
 176 static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
 177 {
 178         int ret;
 179         struct sdio_func_tuple *this, **prev;
 180         unsigned i, ptr = 0;
 181
 182         /*
 183          * Note that this works for the common CIS (function number 0) as
 184          * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
 185          * have the same offset.
 186          */
 187         for (i = 0; i < 3; i++) {
 188                 unsigned char x, fn;
 189
 190                 if (func)
 191                         fn = func->num;
 192                 else
 193                         fn = 0;
 194
 195                 ret = mmc_io_rw_direct(card, 0, 0,
 196                         SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
 197                 if (ret)
 198                         return ret;
 199                 ptr |= x << (i * 8);
 200         }
 201
 202         if (func)
 203                 prev = &func->tuples;
 204         else
 205                 prev = &card->tuples;
 206
 207         BUG_ON(*prev);
 208
 209         do {
 210                 unsigned char tpl_code, tpl_link;
 211
 212                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
 213                 if (ret)
 214                         break;
 215
 216                 /* 0xff means we're done */
 217                 if (tpl_code == 0xff)
 218                         break;
 219
 220                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
 221                 if (ret)
 222                         break;
 223
 224                 this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
 225                 if (!this)
 226                         return -ENOMEM;
 227
 228                 for (i = 0; i < tpl_link; i++) {
 229                         ret = mmc_io_rw_direct(card, 0, 0,
 230                                                ptr + i, 0, &this->data[i]);
 231                         if (ret)
 232                                 break;
 233                 }
 234                 if (ret) {
 235                         kfree(this);
 236                         break;
 237                 }
 238
 239                 for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
 240                         if (cis_tpl_list[i].code == tpl_code)
 241                                 break;
 242                 if (i >= ARRAY_SIZE(cis_tpl_list)) {
 243                         /* this tuple is unknown to the core */
 244                         this->next = NULL;
 245                         this->code = tpl_code;
 246                         this->size = tpl_link;
 247                         *prev = this;
 248                         prev = &this->next;
 249                         printk(KERN_DEBUG
 250                                "%s: queuing CIS tuple 0x%02x length %u\n",
 251                                mmc_hostname(card->host), tpl_code, tpl_link);
 252                 } else {
 253                         const struct cis_tpl *tpl = cis_tpl_list + i;
 254                         if (tpl_link < tpl->min_size) {
 255                                 printk(KERN_ERR
 256                                        "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
 257                                        mmc_hostname(card->host),
 258                                        tpl_code, tpl_link, tpl->min_size);
 259                                 ret = -EINVAL;
 260                         } else if (tpl->parse) {
 261                                 ret = tpl->parse(card, func,
 262                                                  this->data, tpl_link);
 263                         }
 264                         kfree(this);
 265                 }
 266
 267                 ptr += tpl_link;
 268         } while (!ret);
 269
 270         /*
 271          * Link in all unknown tuples found in the common CIS so that
 272          * drivers don't have to go digging in two places.
 273          */
 274         if (func)
 275                 *prev = card->tuples;
 276
 277         return ret;
 278 }
 279
 280 int sdio_read_common_cis(struct mmc_card *card)
 281 {
 282         return sdio_read_cis(card, NULL);
 283 }
 284
 285 void sdio_free_common_cis(struct mmc_card *card)
 286 {
 287         struct sdio_func_tuple *tuple, *victim;
 288
 289         tuple = card->tuples;
 290
 291         while (tuple) {
 292                 victim = tuple;
 293                 tuple = tuple->next;
 294                 kfree(victim);
 295         }
 296
 297         card->tuples = NULL;
 298 }
 299
 300 int sdio_read_func_cis(struct sdio_func *func)
 301 {
 302         int ret;
 303
 304         ret = sdio_read_cis(func->card, func);
 305         if (ret)
 306                 return ret;
 307
 308         /*
 309          * Since we've linked to tuples in the card structure,
 310          * we must make sure we have a reference to it.
 311          */
 312         get_device(&func->card->dev);
 313
 314         /*
 315          * Vendor/device id is optional for function CIS, so
 316          * copy it from the card structure as needed.
 317          */
 318         if (func->vendor == 0) {
 319                 func->vendor = func->card->cis.vendor;
 320                 func->device = func->card->cis.device;
 321         }
 322
 323         return 0;
 324 }
 325
 326 void sdio_free_func_cis(struct sdio_func *func)
 327 {
 328         struct sdio_func_tuple *tuple, *victim;
 329
 330         tuple = func->tuples;
 331
 332         while (tuple && tuple != func->card->tuples) {
 333                 victim = tuple;
 334                 tuple = tuple->next;
 335                 kfree(victim);
 336         }
 337
 338         func->tuples = NULL;
 339
 340         /*
 341          * We have now removed the link to the tuples in the
 342          * card structure, so remove the reference.
 343          */
 344         put_device(&func->card->dev);
 345 }
 346