drivers/net/ixgb/ixgb_ee.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb_hw.h"
  30 #include "ixgb_ee.h"
  31 /* Local prototypes */
  32 static u16 ixgb_shift_in_bits(struct ixgb_hw *hw);
  33
  34 static void ixgb_shift_out_bits(struct ixgb_hw *hw,
  35                                 u16 data,
  36                                 u16 count);
  37 static void ixgb_standby_eeprom(struct ixgb_hw *hw);
  38
  39 static bool ixgb_wait_eeprom_command(struct ixgb_hw *hw);
  40
  41 static void ixgb_cleanup_eeprom(struct ixgb_hw *hw);
  42
  43 /******************************************************************************
  44  * Raises the EEPROM's clock input.
  45  *
  46  * hw - Struct containing variables accessed by shared code
  47  * eecd_reg - EECD's current value
  48  *****************************************************************************/
  49 static void
  50 ixgb_raise_clock(struct ixgb_hw *hw,
  51                   u32 *eecd_reg)
  52 {
  53         /* Raise the clock input to the EEPROM (by setting the SK bit), and then
  54          *  wait 50 microseconds.
  55          */
  56         *eecd_reg = *eecd_reg | IXGB_EECD_SK;
  57         IXGB_WRITE_REG(hw, EECD, *eecd_reg);
  58         udelay(50);
  59         return;
  60 }
  61
  62 /******************************************************************************
  63  * Lowers the EEPROM's clock input.
  64  *
  65  * hw - Struct containing variables accessed by shared code
  66  * eecd_reg - EECD's current value
  67  *****************************************************************************/
  68 static void
  69 ixgb_lower_clock(struct ixgb_hw *hw,
  70                   u32 *eecd_reg)
  71 {
  72         /* Lower the clock input to the EEPROM (by clearing the SK bit), and then
  73          * wait 50 microseconds.
  74          */
  75         *eecd_reg = *eecd_reg & ~IXGB_EECD_SK;
  76         IXGB_WRITE_REG(hw, EECD, *eecd_reg);
  77         udelay(50);
  78         return;
  79 }
  80
  81 /******************************************************************************
  82  * Shift data bits out to the EEPROM.
  83  *
  84  * hw - Struct containing variables accessed by shared code
  85  * data - data to send to the EEPROM
  86  * count - number of bits to shift out
  87  *****************************************************************************/
  88 static void
  89 ixgb_shift_out_bits(struct ixgb_hw *hw,
  90                                          u16 data,
  91                                          u16 count)
  92 {
  93         u32 eecd_reg;
  94         u32 mask;
  95
  96         /* We need to shift "count" bits out to the EEPROM. So, value in the
  97          * "data" parameter will be shifted out to the EEPROM one bit at a time.
  98          * In order to do this, "data" must be broken down into bits.
  99          */
 100         mask = 0x01 << (count - 1);
 101         eecd_reg = IXGB_READ_REG(hw, EECD);
 102         eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
 103         do {
 104                 /* A "1" is shifted out to the EEPROM by setting bit "DI" to a "1",
 105                  * and then raising and then lowering the clock (the SK bit controls
 106                  * the clock input to the EEPROM).  A "0" is shifted out to the EEPROM
 107                  * by setting "DI" to "0" and then raising and then lowering the clock.
 108                  */
 109                 eecd_reg &= ~IXGB_EECD_DI;
 110
 111                 if (data & mask)
 112                         eecd_reg |= IXGB_EECD_DI;
 113
 114                 IXGB_WRITE_REG(hw, EECD, eecd_reg);
 115
 116                 udelay(50);
 117
 118                 ixgb_raise_clock(hw, &eecd_reg);
 119                 ixgb_lower_clock(hw, &eecd_reg);
 120
 121                 mask = mask >> 1;
 122
 123         } while (mask);
 124
 125         /* We leave the "DI" bit set to "0" when we leave this routine. */
 126         eecd_reg &= ~IXGB_EECD_DI;
 127         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 128         return;
 129 }
 130
 131 /******************************************************************************
 132  * Shift data bits in from the EEPROM
 133  *
 134  * hw - Struct containing variables accessed by shared code
 135  *****************************************************************************/
 136 static u16
 137 ixgb_shift_in_bits(struct ixgb_hw *hw)
 138 {
 139         u32 eecd_reg;
 140         u32 i;
 141         u16 data;
 142
 143         /* In order to read a register from the EEPROM, we need to shift 16 bits
 144          * in from the EEPROM. Bits are "shifted in" by raising the clock input to
 145          * the EEPROM (setting the SK bit), and then reading the value of the "DO"
 146          * bit.  During this "shifting in" process the "DI" bit should always be
 147          * clear..
 148          */
 149
 150         eecd_reg = IXGB_READ_REG(hw, EECD);
 151
 152         eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
 153         data = 0;
 154
 155         for (i = 0; i < 16; i++) {
 156                 data = data << 1;
 157                 ixgb_raise_clock(hw, &eecd_reg);
 158
 159                 eecd_reg = IXGB_READ_REG(hw, EECD);
 160
 161                 eecd_reg &= ~(IXGB_EECD_DI);
 162                 if (eecd_reg & IXGB_EECD_DO)
 163                         data |= 1;
 164
 165                 ixgb_lower_clock(hw, &eecd_reg);
 166         }
 167
 168         return data;
 169 }
 170
 171 /******************************************************************************
 172  * Prepares EEPROM for access
 173  *
 174  * hw - Struct containing variables accessed by shared code
 175  *
 176  * Lowers EEPROM clock. Clears input pin. Sets the chip select pin. This
 177  * function should be called before issuing a command to the EEPROM.
 178  *****************************************************************************/
 179 static void
 180 ixgb_setup_eeprom(struct ixgb_hw *hw)
 181 {
 182         u32 eecd_reg;
 183
 184         eecd_reg = IXGB_READ_REG(hw, EECD);
 185
 186         /*  Clear SK and DI  */
 187         eecd_reg &= ~(IXGB_EECD_SK | IXGB_EECD_DI);
 188         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 189
 190         /*  Set CS  */
 191         eecd_reg |= IXGB_EECD_CS;
 192         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 193         return;
 194 }
 195
 196 /******************************************************************************
 197  * Returns EEPROM to a "standby" state
 198  *
 199  * hw - Struct containing variables accessed by shared code
 200  *****************************************************************************/
 201 static void
 202 ixgb_standby_eeprom(struct ixgb_hw *hw)
 203 {
 204         u32 eecd_reg;
 205
 206         eecd_reg = IXGB_READ_REG(hw, EECD);
 207
 208         /*  Deselect EEPROM  */
 209         eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_SK);
 210         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 211         udelay(50);
 212
 213         /*  Clock high  */
 214         eecd_reg |= IXGB_EECD_SK;
 215         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 216         udelay(50);
 217
 218         /*  Select EEPROM  */
 219         eecd_reg |= IXGB_EECD_CS;
 220         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 221         udelay(50);
 222
 223         /*  Clock low  */
 224         eecd_reg &= ~IXGB_EECD_SK;
 225         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 226         udelay(50);
 227         return;
 228 }
 229
 230 /******************************************************************************
 231  * Raises then lowers the EEPROM's clock pin
 232  *
 233  * hw - Struct containing variables accessed by shared code
 234  *****************************************************************************/
 235 static void
 236 ixgb_clock_eeprom(struct ixgb_hw *hw)
 237 {
 238         u32 eecd_reg;
 239
 240         eecd_reg = IXGB_READ_REG(hw, EECD);
 241
 242         /*  Rising edge of clock  */
 243         eecd_reg |= IXGB_EECD_SK;
 244         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 245         udelay(50);
 246
 247         /*  Falling edge of clock  */
 248         eecd_reg &= ~IXGB_EECD_SK;
 249         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 250         udelay(50);
 251         return;
 252 }
 253
 254 /******************************************************************************
 255  * Terminates a command by lowering the EEPROM's chip select pin
 256  *
 257  * hw - Struct containing variables accessed by shared code
 258  *****************************************************************************/
 259 static void
 260 ixgb_cleanup_eeprom(struct ixgb_hw *hw)
 261 {
 262         u32 eecd_reg;
 263
 264         eecd_reg = IXGB_READ_REG(hw, EECD);
 265
 266         eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_DI);
 267
 268         IXGB_WRITE_REG(hw, EECD, eecd_reg);
 269
 270         ixgb_clock_eeprom(hw);
 271         return;
 272 }
 273
 274 /******************************************************************************
 275  * Waits for the EEPROM to finish the current command.
 276  *
 277  * hw - Struct containing variables accessed by shared code
 278  *
 279  * The command is done when the EEPROM's data out pin goes high.
 280  *
 281  * Returns:
 282  *      true: EEPROM data pin is high before timeout.
 283  *      false:  Time expired.
 284  *****************************************************************************/
 285 static bool
 286 ixgb_wait_eeprom_command(struct ixgb_hw *hw)
 287 {
 288         u32 eecd_reg;
 289         u32 i;
 290
 291         /* Toggle the CS line.  This in effect tells to EEPROM to actually execute
 292          * the command in question.
 293          */
 294         ixgb_standby_eeprom(hw);
 295
 296         /* Now read DO repeatedly until is high (equal to '1').  The EEPROM will
 297          * signal that the command has been completed by raising the DO signal.
 298          * If DO does not go high in 10 milliseconds, then error out.
 299          */
 300         for (i = 0; i < 200; i++) {
 301                 eecd_reg = IXGB_READ_REG(hw, EECD);
 302
 303                 if (eecd_reg & IXGB_EECD_DO)
 304                         return (true);
 305
 306                 udelay(50);
 307         }
 308         ASSERT(0);
 309         return (false);
 310 }
 311
 312 /******************************************************************************
 313  * Verifies that the EEPROM has a valid checksum
 314  *
 315  * hw - Struct containing variables accessed by shared code
 316  *
 317  * Reads the first 64 16 bit words of the EEPROM and sums the values read.
 318  * If the sum of the 64 16 bit words is 0xBABA, the EEPROM's checksum is
 319  * valid.
 320  *
 321  * Returns:
 322  *  true: Checksum is valid
 323  *  false: Checksum is not valid.
 324  *****************************************************************************/
 325 bool
 326 ixgb_validate_eeprom_checksum(struct ixgb_hw *hw)
 327 {
 328         u16 checksum = 0;
 329         u16 i;
 330
 331         for (i = 0; i < (EEPROM_CHECKSUM_REG + 1); i++)
 332                 checksum += ixgb_read_eeprom(hw, i);
 333
 334         if (checksum == (u16) EEPROM_SUM)
 335                 return (true);
 336         else
 337                 return (false);
 338 }
 339
 340 /******************************************************************************
 341  * Calculates the EEPROM checksum and writes it to the EEPROM
 342  *
 343  * hw - Struct containing variables accessed by shared code
 344  *
 345  * Sums the first 63 16 bit words of the EEPROM. Subtracts the sum from 0xBABA.
 346  * Writes the difference to word offset 63 of the EEPROM.
 347  *****************************************************************************/
 348 void
 349 ixgb_update_eeprom_checksum(struct ixgb_hw *hw)
 350 {
 351         u16 checksum = 0;
 352         u16 i;
 353
 354         for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
 355                 checksum += ixgb_read_eeprom(hw, i);
 356
 357         checksum = (u16) EEPROM_SUM - checksum;
 358
 359         ixgb_write_eeprom(hw, EEPROM_CHECKSUM_REG, checksum);
 360         return;
 361 }
 362
 363 /******************************************************************************
 364  * Writes a 16 bit word to a given offset in the EEPROM.
 365  *
 366  * hw - Struct containing variables accessed by shared code
 367  * reg - offset within the EEPROM to be written to
 368  * data - 16 bit word to be written to the EEPROM
 369  *
 370  * If ixgb_update_eeprom_checksum is not called after this function, the
 371  * EEPROM will most likely contain an invalid checksum.
 372  *
 373  *****************************************************************************/
 374 void
 375 ixgb_write_eeprom(struct ixgb_hw *hw, u16 offset, u16 data)
 376 {
 377         struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
 378
 379         /* Prepare the EEPROM for writing */
 380         ixgb_setup_eeprom(hw);
 381
 382         /*  Send the 9-bit EWEN (write enable) command to the EEPROM (5-bit opcode
 383          *  plus 4-bit dummy).  This puts the EEPROM into write/erase mode.
 384          */
 385         ixgb_shift_out_bits(hw, EEPROM_EWEN_OPCODE, 5);
 386         ixgb_shift_out_bits(hw, 0, 4);
 387
 388         /*  Prepare the EEPROM  */
 389         ixgb_standby_eeprom(hw);
 390
 391         /*  Send the Write command (3-bit opcode + 6-bit addr)  */
 392         ixgb_shift_out_bits(hw, EEPROM_WRITE_OPCODE, 3);
 393         ixgb_shift_out_bits(hw, offset, 6);
 394
 395         /*  Send the data  */
 396         ixgb_shift_out_bits(hw, data, 16);
 397
 398         ixgb_wait_eeprom_command(hw);
 399
 400         /*  Recover from write  */
 401         ixgb_standby_eeprom(hw);
 402
 403         /* Send the 9-bit EWDS (write disable) command to the EEPROM (5-bit
 404          * opcode plus 4-bit dummy).  This takes the EEPROM out of write/erase
 405          * mode.
 406          */
 407         ixgb_shift_out_bits(hw, EEPROM_EWDS_OPCODE, 5);
 408         ixgb_shift_out_bits(hw, 0, 4);
 409
 410         /*  Done with writing  */
 411         ixgb_cleanup_eeprom(hw);
 412
 413         /* clear the init_ctrl_reg_1 to signify that the cache is invalidated */
 414         ee_map->init_ctrl_reg_1 = cpu_to_le16(EEPROM_ICW1_SIGNATURE_CLEAR);
 415
 416         return;
 417 }
 418
 419 /******************************************************************************
 420  * Reads a 16 bit word from the EEPROM.
 421  *
 422  * hw - Struct containing variables accessed by shared code
 423  * offset - offset of 16 bit word in the EEPROM to read
 424  *
 425  * Returns:
 426  *  The 16-bit value read from the eeprom
 427  *****************************************************************************/
 428 u16
 429 ixgb_read_eeprom(struct ixgb_hw *hw,
 430                   u16 offset)
 431 {
 432         u16 data;
 433
 434         /*  Prepare the EEPROM for reading  */
 435         ixgb_setup_eeprom(hw);
 436
 437         /*  Send the READ command (opcode + addr)  */
 438         ixgb_shift_out_bits(hw, EEPROM_READ_OPCODE, 3);
 439         /*
 440          * We have a 64 word EEPROM, there are 6 address bits
 441          */
 442         ixgb_shift_out_bits(hw, offset, 6);
 443
 444         /*  Read the data  */
 445         data = ixgb_shift_in_bits(hw);
 446
 447         /*  End this read operation  */
 448         ixgb_standby_eeprom(hw);
 449
 450         return (data);
 451 }
 452
 453 /******************************************************************************
 454  * Reads eeprom and stores data in shared structure.
 455  * Validates eeprom checksum and eeprom signature.
 456  *
 457  * hw - Struct containing variables accessed by shared code
 458  *
 459  * Returns:
 460  *      true: if eeprom read is successful
 461  *      false: otherwise.
 462  *****************************************************************************/
 463 bool
 464 ixgb_get_eeprom_data(struct ixgb_hw *hw)
 465 {
 466         u16 i;
 467         u16 checksum = 0;
 468         struct ixgb_ee_map_type *ee_map;
 469
 470         DEBUGFUNC("ixgb_get_eeprom_data");
 471
 472         ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
 473
 474         DEBUGOUT("ixgb_ee: Reading eeprom data\n");
 475         for (i = 0; i < IXGB_EEPROM_SIZE ; i++) {
 476                 u16 ee_data;
 477                 ee_data = ixgb_read_eeprom(hw, i);
 478                 checksum += ee_data;
 479                 hw->eeprom[i] = cpu_to_le16(ee_data);
 480         }
 481
 482         if (checksum != (u16) EEPROM_SUM) {
 483                 DEBUGOUT("ixgb_ee: Checksum invalid.\n");
 484                 /* clear the init_ctrl_reg_1 to signify that the cache is
 485                  * invalidated */
 486                 ee_map->init_ctrl_reg_1 = cpu_to_le16(EEPROM_ICW1_SIGNATURE_CLEAR);
 487                 return (false);
 488         }
 489
 490         if ((ee_map->init_ctrl_reg_1 & cpu_to_le16(EEPROM_ICW1_SIGNATURE_MASK))
 491                  != cpu_to_le16(EEPROM_ICW1_SIGNATURE_VALID)) {
 492                 DEBUGOUT("ixgb_ee: Signature invalid.\n");
 493                 return(false);
 494         }
 495
 496         return(true);
 497 }
 498
 499 /******************************************************************************
 500  * Local function to check if the eeprom signature is good
 501  * If the eeprom signature is good, calls ixgb)get_eeprom_data.
 502  *
 503  * hw - Struct containing variables accessed by shared code
 504  *
 505  * Returns:
 506  *      true: eeprom signature was good and the eeprom read was successful
 507  *      false: otherwise.
 508  ******************************************************************************/
 509 static bool
 510 ixgb_check_and_get_eeprom_data (struct ixgb_hw* hw)
 511 {
 512         struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
 513
 514         if ((ee_map->init_ctrl_reg_1 & cpu_to_le16(EEPROM_ICW1_SIGNATURE_MASK))
 515             == cpu_to_le16(EEPROM_ICW1_SIGNATURE_VALID)) {
 516                 return (true);
 517         } else {
 518                 return ixgb_get_eeprom_data(hw);
 519         }
 520 }
 521
 522 /******************************************************************************
 523  * return a word from the eeprom
 524  *
 525  * hw - Struct containing variables accessed by shared code
 526  * index - Offset of eeprom word
 527  *
 528  * Returns:
 529  *          Word at indexed offset in eeprom, if valid, 0 otherwise.
 530  ******************************************************************************/
 531 __le16
 532 ixgb_get_eeprom_word(struct ixgb_hw *hw, u16 index)
 533 {
 534
 535         if ((index < IXGB_EEPROM_SIZE) &&
 536                 (ixgb_check_and_get_eeprom_data(hw) == true)) {
 537            return(hw->eeprom[index]);
 538         }
 539
 540         return(0);
 541 }
 542
 543 /******************************************************************************
 544  * return the mac address from EEPROM
 545  *
 546  * hw       - Struct containing variables accessed by shared code
 547  * mac_addr - Ethernet Address if EEPROM contents are valid, 0 otherwise
 548  *
 549  * Returns: None.
 550  ******************************************************************************/
 551 void
 552 ixgb_get_ee_mac_addr(struct ixgb_hw *hw,
 553                         u8 *mac_addr)
 554 {
 555         int i;
 556         struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
 557
 558         DEBUGFUNC("ixgb_get_ee_mac_addr");
 559
 560         if (ixgb_check_and_get_eeprom_data(hw) == true) {
 561                 for (i = 0; i < IXGB_ETH_LENGTH_OF_ADDRESS; i++) {
 562                         mac_addr[i] = ee_map->mac_addr[i];
 563                         DEBUGOUT2("mac(%d) = %.2X\n", i, mac_addr[i]);
 564                 }
 565         }
 566 }
 567
 568
 569 /******************************************************************************
 570  * return the Printed Board Assembly number from EEPROM
 571  *
 572  * hw - Struct containing variables accessed by shared code
 573  *
 574  * Returns:
 575  *          PBA number if EEPROM contents are valid, 0 otherwise
 576  ******************************************************************************/
 577 u32
 578 ixgb_get_ee_pba_number(struct ixgb_hw *hw)
 579 {
 580         if (ixgb_check_and_get_eeprom_data(hw) == true)
 581                 return (le16_to_cpu(hw->eeprom[EEPROM_PBA_1_2_REG])
 582                         | (le16_to_cpu(hw->eeprom[EEPROM_PBA_3_4_REG])<<16));
 583
 584         return(0);
 585 }
 586
 587
 588 /******************************************************************************
 589  * return the Device Id from EEPROM
 590  *
 591  * hw - Struct containing variables accessed by shared code
 592  *
 593  * Returns:
 594  *          Device Id if EEPROM contents are valid, 0 otherwise
 595  ******************************************************************************/
 596 u16
 597 ixgb_get_ee_device_id(struct ixgb_hw *hw)
 598 {
 599         struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
 600
 601         if (ixgb_check_and_get_eeprom_data(hw) == true)
 602                 return (le16_to_cpu(ee_map->device_id));
 603
 604         return (0);
 605 }
 606