drivers/at45.c

   1 /* Driver for ATMEL DataFlash support
   2  * Author : Hamid Ikdoumi (Atmel)
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17  * MA 02111-1307 USA
  18  *
  19  */
  20
  21 #include <config.h>
  22 #include <common.h>
  23
  24 #ifdef CONFIG_HAS_DATAFLASH
  25 #include <dataflash.h>
  26
  27 /*
  28  * spi.c API
  29  */
  30 extern unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc);
  31 extern void AT91F_SpiEnable(int cs);
  32
  33 #define AT91C_TIMEOUT_WRDY                      200000
  34
  35 /*----------------------------------------------------------------------*/
  36 /* \fn    AT91F_DataFlashSendCommand                                    */
  37 /* \brief Generic function to send a command to the dataflash           */
  38 /*----------------------------------------------------------------------*/
  39 AT91S_DataFlashStatus AT91F_DataFlashSendCommand(AT91PS_DataFlash pDataFlash,
  40                                                  unsigned char OpCode,
  41                                                  unsigned int CmdSize,
  42                                                  unsigned int DataflashAddress)
  43 {
  44         unsigned int adr;
  45
  46         if ((pDataFlash->pDataFlashDesc->state) != IDLE)
  47                 return DATAFLASH_BUSY;
  48
  49         /* process the address to obtain page address and byte address */
  50         adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
  51                 pDataFlash->pDevice->page_offset) +
  52                         (DataflashAddress % (pDataFlash->pDevice->pages_size));
  53
  54         /* fill the command buffer */
  55         pDataFlash->pDataFlashDesc->command[0] = OpCode;
  56         if (pDataFlash->pDevice->pages_number >= 16384) {
  57                 pDataFlash->pDataFlashDesc->command[1] =
  58                         (unsigned char)((adr & 0x0F000000) >> 24);
  59                 pDataFlash->pDataFlashDesc->command[2] =
  60                         (unsigned char)((adr & 0x00FF0000) >> 16);
  61                 pDataFlash->pDataFlashDesc->command[3] =
  62                         (unsigned char)((adr & 0x0000FF00) >> 8);
  63                 pDataFlash->pDataFlashDesc->command[4] =
  64                         (unsigned char)(adr & 0x000000FF);
  65         } else {
  66                 pDataFlash->pDataFlashDesc->command[1] =
  67                         (unsigned char)((adr & 0x00FF0000) >> 16);
  68                 pDataFlash->pDataFlashDesc->command[2] =
  69                         (unsigned char)((adr & 0x0000FF00) >> 8);
  70                 pDataFlash->pDataFlashDesc->command[3] =
  71                         (unsigned char)(adr & 0x000000FF);
  72                 pDataFlash->pDataFlashDesc->command[4] = 0;
  73         }
  74         pDataFlash->pDataFlashDesc->command[5] = 0;
  75         pDataFlash->pDataFlashDesc->command[6] = 0;
  76         pDataFlash->pDataFlashDesc->command[7] = 0;
  77
  78         /* Initialize the SpiData structure for the spi write fuction */
  79         pDataFlash->pDataFlashDesc->tx_cmd_pt =
  80                 pDataFlash->pDataFlashDesc->command;
  81         pDataFlash->pDataFlashDesc->tx_cmd_size = CmdSize;
  82         pDataFlash->pDataFlashDesc->rx_cmd_pt =
  83                 pDataFlash->pDataFlashDesc->command;
  84         pDataFlash->pDataFlashDesc->rx_cmd_size = CmdSize;
  85
  86         /* send the command and read the data */
  87         return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
  88 }
  89
  90 /*----------------------------------------------------------------------*/
  91 /* \fn    AT91F_DataFlashGetStatus                                      */
  92 /* \brief Read the status register of the dataflash                     */
  93 /*----------------------------------------------------------------------*/
  94 AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
  95 {
  96         AT91S_DataFlashStatus status;
  97
  98         /* if a transfert is in progress ==> return 0 */
  99         if ((pDesc->state) != IDLE)
 100                 return DATAFLASH_BUSY;
 101
 102         /* first send the read status command (D7H) */
 103         pDesc->command[0] = DB_STATUS;
 104         pDesc->command[1] = 0;
 105
 106         pDesc->DataFlash_state = GET_STATUS;
 107         pDesc->tx_data_size = 0;        /* Transmit the command */
 108         /* and receive response */
 109         pDesc->tx_cmd_pt = pDesc->command;
 110         pDesc->rx_cmd_pt = pDesc->command;
 111         pDesc->rx_cmd_size = 2;
 112         pDesc->tx_cmd_size = 2;
 113         status = AT91F_SpiWrite(pDesc);
 114
 115         pDesc->DataFlash_state = *((unsigned char *)(pDesc->rx_cmd_pt) + 1);
 116
 117         return status;
 118 }
 119
 120 /*----------------------------------------------------------------------*/
 121 /* \fn    AT91F_DataFlashWaitReady                                      */
 122 /* \brief wait for dataflash ready (bit7 of the status register == 1)   */
 123 /*----------------------------------------------------------------------*/
 124 AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
 125                                                 pDataFlashDesc,
 126                                                 unsigned int timeout)
 127 {
 128         pDataFlashDesc->DataFlash_state = IDLE;
 129
 130         do {
 131                 AT91F_DataFlashGetStatus(pDataFlashDesc);
 132                 timeout--;
 133         } while (((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
 134                  (timeout > 0));
 135
 136         if ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
 137                 return DATAFLASH_ERROR;
 138
 139         return DATAFLASH_OK;
 140 }
 141
 142 /*--------------------------------------------------------------------------*/
 143 /* Function Name       : AT91F_DataFlashContinuousRead                      */
 144 /* Object              : Continuous stream Read                             */
 145 /* Input Parameters    : DataFlash Service                                  */
 146 /*                                              : <src> = dataflash address */
 147 /*                     : <*dataBuffer> = data buffer pointer                */
 148 /*                     : <sizeToRead> = data buffer size                    */
 149 /* Return value         : State of the dataflash                            */
 150 /*--------------------------------------------------------------------------*/
 151 AT91S_DataFlashStatus AT91F_DataFlashContinuousRead(
 152                                 AT91PS_DataFlash pDataFlash,
 153                                 int src,
 154                                 unsigned char *dataBuffer,
 155                                 int sizeToRead)
 156 {
 157         AT91S_DataFlashStatus status;
 158         /* Test the size to read in the device */
 159         if ((src + sizeToRead) >
 160                         (pDataFlash->pDevice->pages_size *
 161                                 (pDataFlash->pDevice->pages_number)))
 162                 return DATAFLASH_MEMORY_OVERFLOW;
 163
 164         pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
 165         pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
 166         pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
 167         pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;
 168
 169         status = AT91F_DataFlashSendCommand(
 170                         pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
 171         /* Send the command to the dataflash */
 172         return (status);
 173 }
 174
 175 /*---------------------------------------------------------------------------*/
 176 /* Function Name       : AT91F_DataFlashPagePgmBuf                           */
 177 /* Object              : Main memory page program thru buffer 1 or buffer 2  */
 178 /* Input Parameters    : DataFlash Service                                   */
 179 /*                                              : <*src> = Source buffer     */
 180 /*                     : <dest> = dataflash destination address              */
 181 /*                     : <SizeToWrite> = data buffer size                    */
 182 /* Return value         : State of the dataflash                             */
 183 /*---------------------------------------------------------------------------*/
 184 AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(AT91PS_DataFlash pDataFlash,
 185                                                 unsigned char *src,
 186                                                 unsigned int dest,
 187                                                 unsigned int SizeToWrite)
 188 {
 189         int cmdsize;
 190         pDataFlash->pDataFlashDesc->tx_data_pt = src;
 191         pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
 192         pDataFlash->pDataFlashDesc->rx_data_pt = src;
 193         pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
 194
 195         cmdsize = 4;
 196         /* Send the command to the dataflash */
 197         if (pDataFlash->pDevice->pages_number >= 16384)
 198                 cmdsize = 5;
 199         return (AT91F_DataFlashSendCommand(
 200                         pDataFlash, DB_PAGE_PGM_BUF1, cmdsize, dest));
 201 }
 202
 203 /*---------------------------------------------------------------------------*/
 204 /* Function Name       : AT91F_MainMemoryToBufferTransfert                   */
 205 /* Object              : Read a page in the SRAM Buffer 1 or 2               */
 206 /* Input Parameters    : DataFlash Service                                   */
 207 /*                     : Page concerned                                      */
 208 /*                     :                                                     */
 209 /* Return value         : State of the dataflash                             */
 210 /*---------------------------------------------------------------------------*/
 211 AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
 212                                         AT91PS_DataFlash
 213                                         pDataFlash,
 214                                         unsigned char
 215                                         BufferCommand,
 216                                         unsigned int page)
 217 {
 218         int cmdsize;
 219         /* Test if the buffer command is legal */
 220         if ((BufferCommand != DB_PAGE_2_BUF1_TRF) &&
 221                         (BufferCommand != DB_PAGE_2_BUF2_TRF)) {
 222                 return DATAFLASH_BAD_COMMAND;
 223         }
 224
 225         /* no data to transmit or receive */
 226         pDataFlash->pDataFlashDesc->tx_data_size = 0;
 227         cmdsize = 4;
 228         if (pDataFlash->pDevice->pages_number >= 16384)
 229                 cmdsize = 5;
 230         return (AT91F_DataFlashSendCommand(
 231                         pDataFlash, BufferCommand, cmdsize,
 232                         page * pDataFlash->pDevice->pages_size));
 233 }
 234
 235 /*-------------------------------------------------------------------------- */
 236 /* Function Name       : AT91F_DataFlashWriteBuffer                          */
 237 /* Object              : Write data to the internal sram buffer 1 or 2       */
 238 /* Input Parameters    : DataFlash Service                                   */
 239 /*                      : <BufferCommand> = command to write buffer1 or 2    */
 240 /*                     : <*dataBuffer> = data buffer to write                */
 241 /*                     : <bufferAddress> = address in the internal buffer    */
 242 /*                     : <SizeToWrite> = data buffer size                    */
 243 /* Return value         : State of the dataflash                             */
 244 /*---------------------------------------------------------------------------*/
 245 AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer(
 246                                         AT91PS_DataFlash pDataFlash,
 247                                         unsigned char BufferCommand,
 248                                         unsigned char *dataBuffer,
 249                                         unsigned int bufferAddress,
 250                                         int SizeToWrite)
 251 {
 252         int cmdsize;
 253         /* Test if the buffer command is legal */
 254         if ((BufferCommand != DB_BUF1_WRITE) &&
 255                         (BufferCommand != DB_BUF2_WRITE)) {
 256                 return DATAFLASH_BAD_COMMAND;
 257         }
 258
 259         /* buffer address must be lower than page size */
 260         if (bufferAddress > pDataFlash->pDevice->pages_size)
 261                 return DATAFLASH_BAD_ADDRESS;
 262
 263         if ((pDataFlash->pDataFlashDesc->state) != IDLE)
 264                 return DATAFLASH_BUSY;
 265
 266         /* Send first Write Command */
 267         pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
 268         pDataFlash->pDataFlashDesc->command[1] = 0;
 269         if (pDataFlash->pDevice->pages_number >= 16384) {
 270                 pDataFlash->pDataFlashDesc->command[2] = 0;
 271                 pDataFlash->pDataFlashDesc->command[3] =
 272                         (unsigned char)(((unsigned int)(bufferAddress &
 273                                                         pDataFlash->pDevice->
 274                                                         byte_mask)) >> 8);
 275                 pDataFlash->pDataFlashDesc->command[4] =
 276                         (unsigned char)((unsigned int)bufferAddress & 0x00FF);
 277                 cmdsize = 5;
 278         } else {
 279                 pDataFlash->pDataFlashDesc->command[2] =
 280                         (unsigned char)(((unsigned int)(bufferAddress &
 281                                                         pDataFlash->pDevice->
 282                                                         byte_mask)) >> 8);
 283                 pDataFlash->pDataFlashDesc->command[3] =
 284                         (unsigned char)((unsigned int)bufferAddress & 0x00FF);
 285                 pDataFlash->pDataFlashDesc->command[4] = 0;
 286                 cmdsize = 4;
 287         }
 288
 289         pDataFlash->pDataFlashDesc->tx_cmd_pt =
 290                 pDataFlash->pDataFlashDesc->command;
 291         pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
 292         pDataFlash->pDataFlashDesc->rx_cmd_pt =
 293                 pDataFlash->pDataFlashDesc->command;
 294         pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;
 295
 296         pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
 297         pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
 298         pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
 299         pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
 300
 301         return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
 302 }
 303
 304 /*---------------------------------------------------------------------------*/
 305 /* Function Name       : AT91F_PageErase                                     */
 306 /* Object              : Erase a page                                        */
 307 /* Input Parameters    : DataFlash Service                                   */
 308 /*                     : Page concerned                                      */
 309 /*                     :                                                     */
 310 /* Return value         : State of the dataflash                             */
 311 /*---------------------------------------------------------------------------*/
 312 AT91S_DataFlashStatus AT91F_PageErase(
 313                                         AT91PS_DataFlash pDataFlash,
 314                                         unsigned int page)
 315 {
 316         int cmdsize;
 317         /* Test if the buffer command is legal */
 318         /* no data to transmit or receive */
 319         pDataFlash->pDataFlashDesc->tx_data_size = 0;
 320
 321         cmdsize = 4;
 322         if (pDataFlash->pDevice->pages_number >= 16384)
 323                 cmdsize = 5;
 324         return (AT91F_DataFlashSendCommand(pDataFlash,
 325                                 DB_PAGE_ERASE, cmdsize,
 326                                 page * pDataFlash->pDevice->pages_size));
 327 }
 328
 329 /*---------------------------------------------------------------------------*/
 330 /* Function Name       : AT91F_BlockErase                                    */
 331 /* Object              : Erase a Block                                       */
 332 /* Input Parameters    : DataFlash Service                                   */
 333 /*                     : Page concerned                                      */
 334 /*                     :                                                     */
 335 /* Return value         : State of the dataflash                             */
 336 /*---------------------------------------------------------------------------*/
 337 AT91S_DataFlashStatus AT91F_BlockErase(
 338                                 AT91PS_DataFlash pDataFlash,
 339                                 unsigned int block)
 340 {
 341         int cmdsize;
 342         /* Test if the buffer command is legal */
 343         /* no data to transmit or receive */
 344         pDataFlash->pDataFlashDesc->tx_data_size = 0;
 345         cmdsize = 4;
 346         if (pDataFlash->pDevice->pages_number >= 16384)
 347                 cmdsize = 5;
 348         return (AT91F_DataFlashSendCommand(pDataFlash, DB_BLOCK_ERASE, cmdsize,
 349                                         block * 8 *
 350                                         pDataFlash->pDevice->pages_size));
 351 }
 352
 353 /*---------------------------------------------------------------------------*/
 354 /* Function Name       : AT91F_WriteBufferToMain                             */
 355 /* Object              : Write buffer to the main memory                     */
 356 /* Input Parameters    : DataFlash Service                                   */
 357 /*              : <BufferCommand> = command to send to buffer1 or buffer2    */
 358 /*                     : <dest> = main memory address                        */
 359 /* Return value         : State of the dataflash                             */
 360 /*---------------------------------------------------------------------------*/
 361 AT91S_DataFlashStatus AT91F_WriteBufferToMain(AT91PS_DataFlash pDataFlash,
 362                                         unsigned char BufferCommand,
 363                                         unsigned int dest)
 364 {
 365         int cmdsize;
 366         /* Test if the buffer command is correct */
 367         if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
 368                         (BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
 369                         (BufferCommand != DB_BUF2_PAGE_PGM) &&
 370                         (BufferCommand != DB_BUF2_PAGE_ERASE_PGM))
 371                 return DATAFLASH_BAD_COMMAND;
 372
 373         /* no data to transmit or receive */
 374         pDataFlash->pDataFlashDesc->tx_data_size = 0;
 375
 376         cmdsize = 4;
 377         if (pDataFlash->pDevice->pages_number >= 16384)
 378                 cmdsize = 5;
 379         /* Send the command to the dataflash */
 380         return (AT91F_DataFlashSendCommand(pDataFlash, BufferCommand,
 381                                                 cmdsize, dest));
 382 }
 383
 384 /*---------------------------------------------------------------------------*/
 385 /* Function Name       : AT91F_PartialPageWrite                              */
 386 /* Object              : Erase partielly a page                              */
 387 /* Input Parameters    : <page> = page number                                */
 388 /*                      : <AdrInpage> = adr to begin the fading              */
 389 /*                     : <length> = Number of bytes to erase                 */
 390 /*---------------------------------------------------------------------------*/
 391 AT91S_DataFlashStatus AT91F_PartialPageWrite(AT91PS_DataFlash pDataFlash,
 392                                         unsigned char *src,
 393                                         unsigned int dest,
 394                                         unsigned int size)
 395 {
 396         unsigned int page;
 397         unsigned int AdrInPage;
 398
 399         page = dest / (pDataFlash->pDevice->pages_size);
 400         AdrInPage = dest % (pDataFlash->pDevice->pages_size);
 401
 402         /* Read the contents of the page in the Sram Buffer */
 403         AT91F_MainMemoryToBufferTransfert(pDataFlash, DB_PAGE_2_BUF1_TRF, page);
 404         AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 405                                  AT91C_TIMEOUT_WRDY);
 406         /*Update the SRAM buffer */
 407         AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
 408                                         AdrInPage, size);
 409
 410         AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 411                                         AT91C_TIMEOUT_WRDY);
 412
 413         /* Erase page if a 128 Mbits device */
 414         if (pDataFlash->pDevice->pages_number >= 16384) {
 415                 AT91F_PageErase(pDataFlash, page);
 416                 /* Rewrite the modified Sram Buffer in the main memory */
 417                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 418                                          AT91C_TIMEOUT_WRDY);
 419         }
 420
 421         /* Rewrite the modified Sram Buffer in the main memory */
 422         return (AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
 423                                         (page *
 424                                          pDataFlash->pDevice->pages_size)));
 425 }
 426
 427 /*---------------------------------------------------------------------------*/
 428 /* Function Name       : AT91F_DataFlashWrite                                */
 429 /* Object              :                                                     */
 430 /* Input Parameters    : <*src> = Source buffer                              */
 431 /*                     : <dest> = dataflash adress                           */
 432 /*                     : <size> = data buffer size                           */
 433 /*---------------------------------------------------------------------------*/
 434 AT91S_DataFlashStatus AT91F_DataFlashWrite(AT91PS_DataFlash pDataFlash,
 435                                                 unsigned char *src,
 436                                                 int dest, int size)
 437 {
 438         unsigned int length;
 439         unsigned int page;
 440         unsigned int status;
 441
 442         AT91F_SpiEnable(pDataFlash->pDevice->cs);
 443
 444         if ((dest + size) > (pDataFlash->pDevice->pages_size *
 445                         (pDataFlash->pDevice->pages_number)))
 446                 return DATAFLASH_MEMORY_OVERFLOW;
 447
 448         /* If destination does not fit a page start address */
 449         if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size))) != 0) {
 450                 length =
 451                         pDataFlash->pDevice->pages_size -
 452                         (dest % ((unsigned int)(pDataFlash->pDevice->pages_size)));
 453
 454                 if (size < length)
 455                         length = size;
 456
 457                 if (!AT91F_PartialPageWrite(pDataFlash, src, dest, length))
 458                         return DATAFLASH_ERROR;
 459
 460                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 461                                          AT91C_TIMEOUT_WRDY);
 462
 463                 /* Update size, source and destination pointers */
 464                 size -= length;
 465                 dest += length;
 466                 src += length;
 467         }
 468
 469         while ((size - pDataFlash->pDevice->pages_size) >= 0) {
 470                 /* program dataflash page */
 471                 page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);
 472
 473                 status = AT91F_DataFlashWriteBuffer(pDataFlash,
 474                                         DB_BUF1_WRITE, src, 0,
 475                                         pDataFlash->pDevice->
 476                                         pages_size);
 477                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 478                                          AT91C_TIMEOUT_WRDY);
 479
 480                 status = AT91F_PageErase(pDataFlash, page);
 481                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 482                                          AT91C_TIMEOUT_WRDY);
 483                 if (!status)
 484                         return DATAFLASH_ERROR;
 485
 486                 status = AT91F_WriteBufferToMain(pDataFlash,
 487                                          DB_BUF1_PAGE_PGM, dest);
 488                 if (!status)
 489                         return DATAFLASH_ERROR;
 490
 491                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 492                                          AT91C_TIMEOUT_WRDY);
 493
 494                 /* Update size, source and destination pointers */
 495                 size -= pDataFlash->pDevice->pages_size;
 496                 dest += pDataFlash->pDevice->pages_size;
 497                 src += pDataFlash->pDevice->pages_size;
 498         }
 499
 500         /* If still some bytes to read */
 501         if (size > 0) {
 502                 /* program dataflash page */
 503                 if (!AT91F_PartialPageWrite(pDataFlash, src, dest, size))
 504                         return DATAFLASH_ERROR;
 505
 506                 AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 507                                          AT91C_TIMEOUT_WRDY);
 508         }
 509         return DATAFLASH_OK;
 510 }
 511
 512 /*---------------------------------------------------------------------------*/
 513 /* Function Name       : AT91F_DataFlashRead                                 */
 514 /* Object              : Read a block in dataflash                           */
 515 /* Input Parameters    :                                                     */
 516 /* Return value         :                                                    */
 517 /*---------------------------------------------------------------------------*/
 518 int AT91F_DataFlashRead(AT91PS_DataFlash pDataFlash,
 519                         unsigned long addr, unsigned long size, char *buffer)
 520 {
 521         unsigned long SizeToRead;
 522
 523         AT91F_SpiEnable(pDataFlash->pDevice->cs);
 524
 525         if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 526                                         AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
 527                 return -1;
 528
 529         while (size) {
 530                 SizeToRead = (size < 0x8000) ? size : 0x8000;
 531
 532                 if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 533                                         AT91C_TIMEOUT_WRDY) !=
 534                                                 DATAFLASH_OK)
 535                         return -1;
 536
 537                 if (AT91F_DataFlashContinuousRead(pDataFlash, addr,
 538                                                 (uchar *) buffer,
 539                                                 SizeToRead) != DATAFLASH_OK)
 540                         return -1;
 541
 542                 size -= SizeToRead;
 543                 addr += SizeToRead;
 544                 buffer += SizeToRead;
 545         }
 546
 547         return DATAFLASH_OK;
 548 }
 549
 550 /*---------------------------------------------------------------------------*/
 551 /* Function Name       : AT91F_DataflashProbe                                */
 552 /* Object              :                                                     */
 553 /* Input Parameters    :                                                     */
 554 /* Return value        : Dataflash status register                           */
 555 /*---------------------------------------------------------------------------*/
 556 int AT91F_DataflashProbe(int cs, AT91PS_DataflashDesc pDesc)
 557 {
 558         AT91F_SpiEnable(cs);
 559         AT91F_DataFlashGetStatus(pDesc);
 560         return ((pDesc->command[1] == 0xFF) ? 0 : pDesc->command[1] & 0x3C);
 561 }
 562 #endif