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 /* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */ 133 if (vsn > SDIO_SDIO_REV_1_00) 134 func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10; 135 else 136 func->enable_timeout = jiffies_to_msecs(HZ); 137 138 return 0; 139 } 140 141 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func, 142 const unsigned char *buf, unsigned size) 143 { 144 int ret; 145 146 /* 147 * There should be two versions of the CISTPL_FUNCE tuple, 148 * one for the common CIS (function 0) and a version used by 149 * the individual function's CIS (1-7). Yet, the later has a 150 * different length depending on the SDIO spec version. 151 */ 152 if (func) 153 ret = cistpl_funce_func(func, buf, size); 154 else 155 ret = cistpl_funce_common(card, buf, size); 156 157 if (ret) { 158 printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u " 159 "type %u\n", mmc_hostname(card->host), size, buf[0]); 160 return ret; 161 } 162 163 return 0; 164 } 165 166 typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *, 167 const unsigned char *, unsigned); 168 169 struct cis_tpl { 170 unsigned char code; 171 unsigned char min_size; 172 tpl_parse_t *parse; 173 }; 174 175 static const struct cis_tpl cis_tpl_list[] = { 176 { 0x15, 3, cistpl_vers_1 }, 177 { 0x20, 4, cistpl_manfid }, 178 { 0x21, 2, /* cistpl_funcid */ }, 179 { 0x22, 0, cistpl_funce }, 180 }; 181 182 static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func) 183 { 184 int ret; 185 struct sdio_func_tuple *this, **prev; 186 unsigned i, ptr = 0; 187 188 /* 189 * Note that this works for the common CIS (function number 0) as 190 * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS 191 * have the same offset. 192 */ 193 for (i = 0; i < 3; i++) { 194 unsigned char x, fn; 195 196 if (func) 197 fn = func->num; 198 else 199 fn = 0; 200 201 ret = mmc_io_rw_direct(card, 0, 0, 202 SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x); 203 if (ret) 204 return ret; 205 ptr |= x << (i * 8); 206 } 207 208 if (func) 209 prev = &func->tuples; 210 else 211 prev = &card->tuples; 212 213 BUG_ON(*prev); 214 215 do { 216 unsigned char tpl_code, tpl_link; 217 218 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code); 219 if (ret) 220 break; 221 222 /* 0xff means we're done */ 223 if (tpl_code == 0xff) 224 break; 225 226 /* null entries have no link field or data */ 227 if (tpl_code == 0x00) 228 continue; 229 230 ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link); 231 if (ret) 232 break; 233 234 /* a size of 0xff also means we're done */ 235 if (tpl_link == 0xff) 236 break; 237 238 this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL); 239 if (!this) 240 return -ENOMEM; 241 242 for (i = 0; i < tpl_link; i++) { 243 ret = mmc_io_rw_direct(card, 0, 0, 244 ptr + i, 0, &this->data[i]); 245 if (ret) 246 break; 247 } 248 if (ret) { 249 kfree(this); 250 break; 251 } 252 253 for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++) 254 if (cis_tpl_list[i].code == tpl_code) 255 break; 256 if (i >= ARRAY_SIZE(cis_tpl_list)) { 257 /* this tuple is unknown to the core */ 258 this->next = NULL; 259 this->code = tpl_code; 260 this->size = tpl_link; 261 *prev = this; 262 prev = &this->next; 263 printk(KERN_DEBUG 264 "%s: queuing CIS tuple 0x%02x length %u\n", 265 mmc_hostname(card->host), tpl_code, tpl_link); 266 } else { 267 const struct cis_tpl *tpl = cis_tpl_list + i; 268 if (tpl_link < tpl->min_size) { 269 printk(KERN_ERR 270 "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n", 271 mmc_hostname(card->host), 272 tpl_code, tpl_link, tpl->min_size); 273 ret = -EINVAL; 274 } else if (tpl->parse) { 275 ret = tpl->parse(card, func, 276 this->data, tpl_link); 277 } 278 kfree(this); 279 } 280 281 ptr += tpl_link; 282 } while (!ret); 283 284 /* 285 * Link in all unknown tuples found in the common CIS so that 286 * drivers don't have to go digging in two places. 287 */ 288 if (func) 289 *prev = card->tuples; 290 291 return ret; 292 } 293 294 int sdio_read_common_cis(struct mmc_card *card) 295 { 296 return sdio_read_cis(card, NULL); 297 } 298 299 void sdio_free_common_cis(struct mmc_card *card) 300 { 301 struct sdio_func_tuple *tuple, *victim; 302 303 tuple = card->tuples; 304 305 while (tuple) { 306 victim = tuple; 307 tuple = tuple->next; 308 kfree(victim); 309 } 310 311 card->tuples = NULL; 312 } 313 314 int sdio_read_func_cis(struct sdio_func *func) 315 { 316 int ret; 317 318 ret = sdio_read_cis(func->card, func); 319 if (ret) 320 return ret; 321 322 /* 323 * Since we've linked to tuples in the card structure, 324 * we must make sure we have a reference to it. 325 */ 326 get_device(&func->card->dev); 327 328 /* 329 * Vendor/device id is optional for function CIS, so 330 * copy it from the card structure as needed. 331 */ 332 if (func->vendor == 0) { 333 func->vendor = func->card->cis.vendor; 334 func->device = func->card->cis.device; 335 } 336 337 return 0; 338 } 339 340 void sdio_free_func_cis(struct sdio_func *func) 341 { 342 struct sdio_func_tuple *tuple, *victim; 343 344 tuple = func->tuples; 345 346 while (tuple && tuple != func->card->tuples) { 347 victim = tuple; 348 tuple = tuple->next; 349 kfree(victim); 350 } 351 352 func->tuples = NULL; 353 354 /* 355 * We have now removed the link to the tuples in the 356 * card structure, so remove the reference. 357 */ 358 put_device(&func->card->dev); 359 } 360 361