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_manfid(struct mmc_card *card, struct sdio_func *func,
  27                          const unsigned char *buf, unsigned size)
  28 {
  29         unsigned int vendor, device;
  30
  31         /* TPLMID_MANF */
  32         vendor = buf[0] | (buf[1] << 8);
  33
  34         /* TPLMID_CARD */
  35         device = buf[2] | (buf[3] << 8);
  36
  37         if (func) {
  38                 func->vendor = vendor;
  39                 func->device = device;
  40         } else {
  41                 card->cis.vendor = vendor;
  42                 card->cis.device = device;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static const unsigned char speed_val[16] =
  49         { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
  50 static const unsigned int speed_unit[8] =
  51         { 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
  52
  53 static int cistpl_funce_common(struct mmc_card *card,
  54                                const unsigned char *buf, unsigned size)
  55 {
  56         if (size < 0x04 || buf[0] != 0)
  57                 return -EINVAL;
  58
  59         /* TPLFE_FN0_BLK_SIZE */
  60         card->cis.blksize = buf[1] | (buf[2] << 8);
  61
  62         /* TPLFE_MAX_TRAN_SPEED */
  63         card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
  64                             speed_unit[buf[3] & 7];
  65
  66         return 0;
  67 }
  68
  69 static int cistpl_funce_func(struct sdio_func *func,
  70                              const unsigned char *buf, unsigned size)
  71 {
  72         unsigned vsn;
  73         unsigned min_size;
  74
  75         vsn = func->card->cccr.sdio_vsn;
  76         min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
  77
  78         if (size < min_size || buf[0] != 1)
  79                 return -EINVAL;
  80
  81         /* TPLFE_MAX_BLK_SIZE */
  82         func->blksize = buf[12] | (buf[13] << 8);
  83
  84         return 0;
  85 }
  86
  87 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
  88                         const unsigned char *buf, unsigned size)
  89 {
  90         int ret;
  91
  92         /*
  93          * There should be two versions of the CISTPL_FUNCE tuple,
  94          * one for the common CIS (function 0) and a version used by
  95          * the individual function's CIS (1-7). Yet, the later has a
  96          * different length depending on the SDIO spec version.
  97          */
  98         if (func)
  99                 ret = cistpl_funce_func(func, buf, size);
 100         else
 101                 ret = cistpl_funce_common(card, buf, size);
 102
 103         if (ret) {
 104                 printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "
 105                        "type %u\n", mmc_hostname(card->host), size, buf[0]);
 106                 return ret;
 107         }
 108
 109         return 0;
 110 }
 111
 112 typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
 113                            const unsigned char *, unsigned);
 114
 115 struct cis_tpl {
 116         unsigned char code;
 117         unsigned char min_size;
 118         tpl_parse_t *parse;
 119 };
 120
 121 static const struct cis_tpl cis_tpl_list[] = {
 122         {       0x15,   3,      /* cistpl_vers_1 */     },
 123         {       0x20,   4,      cistpl_manfid           },
 124         {       0x21,   2,      /* cistpl_funcid */     },
 125         {       0x22,   0,      cistpl_funce            },
 126 };
 127
 128 static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
 129 {
 130         int ret;
 131         struct sdio_func_tuple *this, **prev;
 132         unsigned i, ptr = 0;
 133
 134         /*
 135          * Note that this works for the common CIS (function number 0) as
 136          * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
 137          * have the same offset.
 138          */
 139         for (i = 0; i < 3; i++) {
 140                 unsigned char x, fn;
 141
 142                 if (func)
 143                         fn = func->num;
 144                 else
 145                         fn = 0;
 146
 147                 ret = mmc_io_rw_direct(card, 0, 0,
 148                                        fn * 0x100 + SDIO_FBR_CIS + i, 0, &x);
 149                 if (ret)
 150                         return ret;
 151                 ptr |= x << (i * 8);
 152         }
 153
 154         if (func)
 155                 prev = &func->tuples;
 156         else
 157                 prev = &card->tuples;
 158
 159         BUG_ON(*prev);
 160
 161         do {
 162                 unsigned char tpl_code, tpl_link;
 163
 164                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
 165                 if (ret)
 166                         break;
 167
 168                 /* 0xff means we're done */
 169                 if (tpl_code == 0xff)
 170                         break;
 171
 172                 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
 173                 if (ret)
 174                         break;
 175
 176                 this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
 177                 if (!this)
 178                         return -ENOMEM;
 179
 180                 for (i = 0; i < tpl_link; i++) {
 181                         ret = mmc_io_rw_direct(card, 0, 0,
 182                                                ptr + i, 0, &this->data[i]);
 183                         if (ret)
 184                                 break;
 185                 }
 186                 if (ret) {
 187                         kfree(this);
 188                         break;
 189                 }
 190
 191                 for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
 192                         if (cis_tpl_list[i].code == tpl_code)
 193                                 break;
 194                 if (i >= ARRAY_SIZE(cis_tpl_list)) {
 195                         /* this tuple is unknown to the core */
 196                         this->next = NULL;
 197                         this->code = tpl_code;
 198                         this->size = tpl_link;
 199                         *prev = this;
 200                         prev = &this->next;
 201                         printk(KERN_DEBUG
 202                                "%s: queuing CIS tuple 0x%02x length %u\n",
 203                                mmc_hostname(card->host), tpl_code, tpl_link);
 204                 } else {
 205                         const struct cis_tpl *tpl = cis_tpl_list + i;
 206                         if (tpl_link < tpl->min_size) {
 207                                 printk(KERN_ERR
 208                                        "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
 209                                        mmc_hostname(card->host),
 210                                        tpl_code, tpl_link, tpl->min_size);
 211                                 ret = -EINVAL;
 212                         } else if (tpl->parse) {
 213                                 ret = tpl->parse(card, func,
 214                                                  this->data, tpl_link);
 215                         }
 216                         kfree(this);
 217                 }
 218
 219                 ptr += tpl_link;
 220         } while (!ret);
 221
 222         /*
 223          * Link in all unknown tuples found in the common CIS so that
 224          * drivers don't have to go digging in two places.
 225          */
 226         if (func)
 227                 *prev = card->tuples;
 228
 229         return ret;
 230 }
 231
 232 int sdio_read_common_cis(struct mmc_card *card)
 233 {
 234         return sdio_read_cis(card, NULL);
 235 }
 236
 237 void sdio_free_common_cis(struct mmc_card *card)
 238 {
 239         struct sdio_func_tuple *tuple, *victim;
 240
 241         tuple = card->tuples;
 242
 243         while (tuple) {
 244                 victim = tuple;
 245                 tuple = tuple->next;
 246                 kfree(victim);
 247         }
 248
 249         card->tuples = NULL;
 250 }
 251
 252 int sdio_read_func_cis(struct sdio_func *func)
 253 {
 254         int ret;
 255
 256         ret = sdio_read_cis(func->card, func);
 257         if (ret)
 258                 return ret;
 259
 260         /*
 261          * Since we've linked to tuples in the card structure,
 262          * we must make sure we have a reference to it.
 263          */
 264         get_device(&func->card->dev);
 265
 266         /*
 267          * Vendor/device id is optional for function CIS, so
 268          * copy it from the card structure as needed.
 269          */
 270         if (func->vendor == 0) {
 271                 func->vendor = func->card->cis.vendor;
 272                 func->device = func->card->cis.device;
 273         }
 274
 275         return 0;
 276 }
 277
 278 void sdio_free_func_cis(struct sdio_func *func)
 279 {
 280         struct sdio_func_tuple *tuple, *victim;
 281
 282         tuple = func->tuples;
 283
 284         while (tuple && tuple != func->card->tuples) {
 285                 victim = tuple;
 286                 tuple = tuple->next;
 287                 kfree(victim);
 288         }
 289
 290         func->tuples = NULL;
 291
 292         /*
 293          * We have now removed the link to the tuples in the
 294          * card structure, so remove the reference.
 295          */
 296         put_device(&func->card->dev);
 297 }
 298