drivers/mmc/core/sdio_io.c

   1 /*
   2  *  linux/drivers/mmc/core/sdio_io.c
   3  *
   4  *  Copyright 2007 Pierre Ossman
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  */
  11
  12 #include <linux/mmc/host.h>
  13 #include <linux/mmc/card.h>
  14 #include <linux/mmc/sdio.h>
  15 #include <linux/mmc/sdio_func.h>
  16
  17 #include "sdio_ops.h"
  18
  19 /**
  20  *      sdio_claim_host - exclusively claim a bus for a certain SDIO function
  21  *      @func: SDIO function that will be accessed
  22  *
  23  *      Claim a bus for a set of operations. The SDIO function given
  24  *      is used to figure out which bus is relevant.
  25  */
  26 void sdio_claim_host(struct sdio_func *func)
  27 {
  28         BUG_ON(!func);
  29         BUG_ON(!func->card);
  30
  31         mmc_claim_host(func->card->host);
  32 }
  33 EXPORT_SYMBOL_GPL(sdio_claim_host);
  34
  35 /**
  36  *      sdio_release_host - release a bus for a certain SDIO function
  37  *      @func: SDIO function that was accessed
  38  *
  39  *      Release a bus, allowing others to claim the bus for their
  40  *      operations.
  41  */
  42 void sdio_release_host(struct sdio_func *func)
  43 {
  44         BUG_ON(!func);
  45         BUG_ON(!func->card);
  46
  47         mmc_release_host(func->card->host);
  48 }
  49 EXPORT_SYMBOL_GPL(sdio_release_host);
  50
  51 /**
  52  *      sdio_enable_func - enables a SDIO function for usage
  53  *      @func: SDIO function to enable
  54  *
  55  *      Powers up and activates a SDIO function so that register
  56  *      access is possible.
  57  */
  58 int sdio_enable_func(struct sdio_func *func)
  59 {
  60         int ret;
  61         unsigned char reg;
  62         unsigned long timeout;
  63
  64         BUG_ON(!func);
  65         BUG_ON(!func->card);
  66
  67         pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
  68
  69         ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, &reg);
  70         if (ret)
  71                 goto err;
  72
  73         reg |= 1 << func->num;
  74
  75         ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
  76         if (ret)
  77                 goto err;
  78
  79         /*
  80          * FIXME: This should timeout based on information in the CIS,
  81          * but we don't have card to parse that yet.
  82          */
  83         timeout = jiffies + HZ;
  84
  85         while (1) {
  86                 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, &reg);
  87                 if (ret)
  88                         goto err;
  89                 if (reg & (1 << func->num))
  90                         break;
  91                 ret = -ETIME;
  92                 if (time_after(jiffies, timeout))
  93                         goto err;
  94         }
  95
  96         pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
  97
  98         return 0;
  99
 100 err:
 101         pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
 102         return ret;
 103 }
 104 EXPORT_SYMBOL_GPL(sdio_enable_func);
 105
 106 /**
 107  *      sdio_disable_func - disable a SDIO function
 108  *      @func: SDIO function to disable
 109  *
 110  *      Powers down and deactivates a SDIO function. Register access
 111  *      to this function will fail until the function is reenabled.
 112  */
 113 int sdio_disable_func(struct sdio_func *func)
 114 {
 115         int ret;
 116         unsigned char reg;
 117
 118         BUG_ON(!func);
 119         BUG_ON(!func->card);
 120
 121         pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
 122
 123         ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, &reg);
 124         if (ret)
 125                 goto err;
 126
 127         reg &= ~(1 << func->num);
 128
 129         ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
 130         if (ret)
 131                 goto err;
 132
 133         pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
 134
 135         return 0;
 136
 137 err:
 138         pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
 139         return -EIO;
 140 }
 141 EXPORT_SYMBOL_GPL(sdio_disable_func);
 142
 143 /**
 144  *      sdio_set_block_size - set the block size of an SDIO function
 145  *      @func: SDIO function to change
 146  *      @blksz: new block size or 0 to use the default.
 147  *
 148  *      The default block size is the largest supported by both the function
 149  *      and the host, with a maximum of 512 to ensure that arbitrarily sized
 150  *      data transfer use the optimal (least) number of commands.
 151  *
 152  *      A driver may call this to override the default block size set by the
 153  *      core. This can be used to set a block size greater than the maximum
 154  *      that reported by the card; it is the driver's responsibility to ensure
 155  *      it uses a value that the card supports.
 156  *
 157  *      Returns 0 on success, -EINVAL if the host does not support the
 158  *      requested block size, or -EIO (etc.) if one of the resultant FBR block
 159  *      size register writes failed.
 160  *
 161  */
 162 int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
 163 {
 164         int ret;
 165
 166         if (blksz > func->card->host->max_blk_size)
 167                 return -EINVAL;
 168
 169         if (blksz == 0) {
 170                 blksz = min(min(
 171                         func->max_blksize,
 172                         func->card->host->max_blk_size),
 173                         512u);
 174         }
 175
 176         ret = mmc_io_rw_direct(func->card, 1, 0,
 177                 SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
 178                 blksz & 0xff, NULL);
 179         if (ret)
 180                 return ret;
 181         ret = mmc_io_rw_direct(func->card, 1, 0,
 182                 SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1,
 183                 (blksz >> 8) & 0xff, NULL);
 184         if (ret)
 185                 return ret;
 186         func->cur_blksize = blksz;
 187         return 0;
 188 }
 189
 190 EXPORT_SYMBOL_GPL(sdio_set_block_size);
 191
 192 /* Split an arbitrarily sized data transfer into several
 193  * IO_RW_EXTENDED commands. */
 194 static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
 195         unsigned addr, int incr_addr, u8 *buf, unsigned size)
 196 {
 197         unsigned remainder = size;
 198         unsigned max_blocks;
 199         int ret;
 200
 201         /* Do the bulk of the transfer using block mode (if supported). */
 202         if (func->card->cccr.multi_block) {
 203                 /* Blocks per command is limited by host count, host transfer
 204                  * size (we only use a single sg entry) and the maximum for
 205                  * IO_RW_EXTENDED of 511 blocks. */
 206                 max_blocks = min(min(
 207                         func->card->host->max_blk_count,
 208                         func->card->host->max_seg_size / func->cur_blksize),
 209                         511u);
 210
 211                 while (remainder > func->cur_blksize) {
 212                         unsigned blocks;
 213
 214                         blocks = remainder / func->cur_blksize;
 215                         if (blocks > max_blocks)
 216                                 blocks = max_blocks;
 217                         size = blocks * func->cur_blksize;
 218
 219                         ret = mmc_io_rw_extended(func->card, write,
 220                                 func->num, addr, incr_addr, buf,
 221                                 blocks, func->cur_blksize);
 222                         if (ret)
 223                                 return ret;
 224
 225                         remainder -= size;
 226                         buf += size;
 227                         if (incr_addr)
 228                                 addr += size;
 229                 }
 230         }
 231
 232         /* Write the remainder using byte mode. */
 233         while (remainder > 0) {
 234                 size = remainder;
 235                 if (size > func->cur_blksize)
 236                         size = func->cur_blksize;
 237                 if (size > 512)
 238                         size = 512; /* maximum size for byte mode */
 239
 240                 ret = mmc_io_rw_extended(func->card, write, func->num, addr,
 241                          incr_addr, buf, 1, size);
 242                 if (ret)
 243                         return ret;
 244
 245                 remainder -= size;
 246                 buf += size;
 247                 if (incr_addr)
 248                         addr += size;
 249         }
 250         return 0;
 251 }
 252
 253 /**
 254  *      sdio_readb - read a single byte from a SDIO function
 255  *      @func: SDIO function to access
 256  *      @addr: address to read
 257  *      @err_ret: optional status value from transfer
 258  *
 259  *      Reads a single byte from the address space of a given SDIO
 260  *      function. If there is a problem reading the address, 0xff
 261  *      is returned and @err_ret will contain the error code.
 262  */
 263 unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
 264         int *err_ret)
 265 {
 266         int ret;
 267         unsigned char val;
 268
 269         BUG_ON(!func);
 270
 271         if (err_ret)
 272                 *err_ret = 0;
 273
 274         ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
 275         if (ret) {
 276                 if (err_ret)
 277                         *err_ret = ret;
 278                 return 0xFF;
 279         }
 280
 281         return val;
 282 }
 283 EXPORT_SYMBOL_GPL(sdio_readb);
 284
 285 /**
 286  *      sdio_writeb - write a single byte to a SDIO function
 287  *      @func: SDIO function to access
 288  *      @b: byte to write
 289  *      @addr: address to write to
 290  *      @err_ret: optional status value from transfer
 291  *
 292  *      Writes a single byte to the address space of a given SDIO
 293  *      function. @err_ret will contain the status of the actual
 294  *      transfer.
 295  */
 296 void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
 297         int *err_ret)
 298 {
 299         int ret;
 300
 301         BUG_ON(!func);
 302
 303         ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
 304         if (err_ret)
 305                 *err_ret = ret;
 306 }
 307 EXPORT_SYMBOL_GPL(sdio_writeb);
 308
 309 /**
 310  *      sdio_memcpy_fromio - read a chunk of memory from a SDIO function
 311  *      @func: SDIO function to access
 312  *      @dst: buffer to store the data
 313  *      @addr: address to begin reading from
 314  *      @count: number of bytes to read
 315  *
 316  *      Reads from the address space of a given SDIO function. Return
 317  *      value indicates if the transfer succeeded or not.
 318  */
 319 int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
 320         unsigned int addr, int count)
 321 {
 322         return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
 323 }
 324 EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
 325
 326 /**
 327  *      sdio_memcpy_toio - write a chunk of memory to a SDIO function
 328  *      @func: SDIO function to access
 329  *      @addr: address to start writing to
 330  *      @src: buffer that contains the data to write
 331  *      @count: number of bytes to write
 332  *
 333  *      Writes to the address space of a given SDIO function. Return
 334  *      value indicates if the transfer succeeded or not.
 335  */
 336 int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
 337         void *src, int count)
 338 {
 339         return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
 340 }
 341 EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
 342
 343 /**
 344  *      sdio_readsb - read from a FIFO on a SDIO function
 345  *      @func: SDIO function to access
 346  *      @dst: buffer to store the data
 347  *      @addr: address of (single byte) FIFO
 348  *      @count: number of bytes to read
 349  *
 350  *      Reads from the specified FIFO of a given SDIO function. Return
 351  *      value indicates if the transfer succeeded or not.
 352  */
 353 int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
 354         int count)
 355 {
 356         return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
 357 }
 358
 359 EXPORT_SYMBOL_GPL(sdio_readsb);
 360
 361 /**
 362  *      sdio_writesb - write to a FIFO of a SDIO function
 363  *      @func: SDIO function to access
 364  *      @addr: address of (single byte) FIFO
 365  *      @src: buffer that contains the data to write
 366  *      @count: number of bytes to write
 367  *
 368  *      Writes to the specified FIFO of a given SDIO function. Return
 369  *      value indicates if the transfer succeeded or not.
 370  */
 371 int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
 372         int count)
 373 {
 374         return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
 375 }
 376 EXPORT_SYMBOL_GPL(sdio_writesb);
 377
 378 /**
 379  *      sdio_readw - read a 16 bit integer from a SDIO function
 380  *      @func: SDIO function to access
 381  *      @addr: address to read
 382  *      @err_ret: optional status value from transfer
 383  *
 384  *      Reads a 16 bit integer from the address space of a given SDIO
 385  *      function. If there is a problem reading the address, 0xffff
 386  *      is returned and @err_ret will contain the error code.
 387  */
 388 unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
 389         int *err_ret)
 390 {
 391         int ret;
 392
 393         if (err_ret)
 394                 *err_ret = 0;
 395
 396         ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
 397         if (ret) {
 398                 if (err_ret)
 399                         *err_ret = ret;
 400                 return 0xFFFF;
 401         }
 402
 403         return le16_to_cpu(*(u16*)func->tmpbuf);
 404 }
 405 EXPORT_SYMBOL_GPL(sdio_readw);
 406
 407 /**
 408  *      sdio_writew - write a 16 bit integer to a SDIO function
 409  *      @func: SDIO function to access
 410  *      @b: integer to write
 411  *      @addr: address to write to
 412  *      @err_ret: optional status value from transfer
 413  *
 414  *      Writes a 16 bit integer to the address space of a given SDIO
 415  *      function. @err_ret will contain the status of the actual
 416  *      transfer.
 417  */
 418 void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
 419         int *err_ret)
 420 {
 421         int ret;
 422
 423         *(u16*)func->tmpbuf = cpu_to_le16(b);
 424
 425         ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
 426         if (err_ret)
 427                 *err_ret = ret;
 428 }
 429 EXPORT_SYMBOL_GPL(sdio_writew);
 430
 431 /**
 432  *      sdio_readl - read a 32 bit integer from a SDIO function
 433  *      @func: SDIO function to access
 434  *      @addr: address to read
 435  *      @err_ret: optional status value from transfer
 436  *
 437  *      Reads a 32 bit integer from the address space of a given SDIO
 438  *      function. If there is a problem reading the address,
 439  *      0xffffffff is returned and @err_ret will contain the error
 440  *      code.
 441  */
 442 unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
 443         int *err_ret)
 444 {
 445         int ret;
 446
 447         if (err_ret)
 448                 *err_ret = 0;
 449
 450         ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
 451         if (ret) {
 452                 if (err_ret)
 453                         *err_ret = ret;
 454                 return 0xFFFFFFFF;
 455         }
 456
 457         return le32_to_cpu(*(u32*)func->tmpbuf);
 458 }
 459 EXPORT_SYMBOL_GPL(sdio_readl);
 460
 461 /**
 462  *      sdio_writel - write a 32 bit integer to a SDIO function
 463  *      @func: SDIO function to access
 464  *      @b: integer to write
 465  *      @addr: address to write to
 466  *      @err_ret: optional status value from transfer
 467  *
 468  *      Writes a 32 bit integer to the address space of a given SDIO
 469  *      function. @err_ret will contain the status of the actual
 470  *      transfer.
 471  */
 472 void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
 473         int *err_ret)
 474 {
 475         int ret;
 476
 477         *(u32*)func->tmpbuf = cpu_to_le32(b);
 478
 479         ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
 480         if (err_ret)
 481                 *err_ret = ret;
 482 }
 483 EXPORT_SYMBOL_GPL(sdio_writel);
 484