1 /*******************************************************************************
3 Intel PRO/10GbE Linux driver
4 Copyright(c) 1999 - 2006 Intel Corporation.
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.
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
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.
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
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
27 *******************************************************************************/
31 /* Local prototypes */
32 static uint16_t ixgb_shift_in_bits(struct ixgb_hw *hw);
34 static void ixgb_shift_out_bits(struct ixgb_hw *hw,
37 static void ixgb_standby_eeprom(struct ixgb_hw *hw);
39 static bool ixgb_wait_eeprom_command(struct ixgb_hw *hw);
41 static void ixgb_cleanup_eeprom(struct ixgb_hw *hw);
43 /******************************************************************************
44 * Raises the EEPROM's clock input.
46 * hw - Struct containing variables accessed by shared code
47 * eecd_reg - EECD's current value
48 *****************************************************************************/
50 ixgb_raise_clock(struct ixgb_hw *hw,
53 /* Raise the clock input to the EEPROM (by setting the SK bit), and then
54 * wait 50 microseconds.
56 *eecd_reg = *eecd_reg | IXGB_EECD_SK;
57 IXGB_WRITE_REG(hw, EECD, *eecd_reg);
62 /******************************************************************************
63 * Lowers the EEPROM's clock input.
65 * hw - Struct containing variables accessed by shared code
66 * eecd_reg - EECD's current value
67 *****************************************************************************/
69 ixgb_lower_clock(struct ixgb_hw *hw,
72 /* Lower the clock input to the EEPROM (by clearing the SK bit), and then
73 * wait 50 microseconds.
75 *eecd_reg = *eecd_reg & ~IXGB_EECD_SK;
76 IXGB_WRITE_REG(hw, EECD, *eecd_reg);
81 /******************************************************************************
82 * Shift data bits out to the EEPROM.
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 *****************************************************************************/
89 ixgb_shift_out_bits(struct ixgb_hw *hw,
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.
100 mask = 0x01 << (count - 1);
101 eecd_reg = IXGB_READ_REG(hw, EECD);
102 eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
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.
109 eecd_reg &= ~IXGB_EECD_DI;
112 eecd_reg |= IXGB_EECD_DI;
114 IXGB_WRITE_REG(hw, EECD, eecd_reg);
118 ixgb_raise_clock(hw, &eecd_reg);
119 ixgb_lower_clock(hw, &eecd_reg);
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);
131 /******************************************************************************
132 * Shift data bits in from the EEPROM
134 * hw - Struct containing variables accessed by shared code
135 *****************************************************************************/
137 ixgb_shift_in_bits(struct ixgb_hw *hw)
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
150 eecd_reg = IXGB_READ_REG(hw, EECD);
152 eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
155 for(i = 0; i < 16; i++) {
157 ixgb_raise_clock(hw, &eecd_reg);
159 eecd_reg = IXGB_READ_REG(hw, EECD);
161 eecd_reg &= ~(IXGB_EECD_DI);
162 if(eecd_reg & IXGB_EECD_DO)
165 ixgb_lower_clock(hw, &eecd_reg);
171 /******************************************************************************
172 * Prepares EEPROM for access
174 * hw - Struct containing variables accessed by shared code
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 *****************************************************************************/
180 ixgb_setup_eeprom(struct ixgb_hw *hw)
184 eecd_reg = IXGB_READ_REG(hw, EECD);
186 /* Clear SK and DI */
187 eecd_reg &= ~(IXGB_EECD_SK | IXGB_EECD_DI);
188 IXGB_WRITE_REG(hw, EECD, eecd_reg);
191 eecd_reg |= IXGB_EECD_CS;
192 IXGB_WRITE_REG(hw, EECD, eecd_reg);
196 /******************************************************************************
197 * Returns EEPROM to a "standby" state
199 * hw - Struct containing variables accessed by shared code
200 *****************************************************************************/
202 ixgb_standby_eeprom(struct ixgb_hw *hw)
206 eecd_reg = IXGB_READ_REG(hw, EECD);
209 eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_SK);
210 IXGB_WRITE_REG(hw, EECD, eecd_reg);
214 eecd_reg |= IXGB_EECD_SK;
215 IXGB_WRITE_REG(hw, EECD, eecd_reg);
219 eecd_reg |= IXGB_EECD_CS;
220 IXGB_WRITE_REG(hw, EECD, eecd_reg);
224 eecd_reg &= ~IXGB_EECD_SK;
225 IXGB_WRITE_REG(hw, EECD, eecd_reg);
230 /******************************************************************************
231 * Raises then lowers the EEPROM's clock pin
233 * hw - Struct containing variables accessed by shared code
234 *****************************************************************************/
236 ixgb_clock_eeprom(struct ixgb_hw *hw)
240 eecd_reg = IXGB_READ_REG(hw, EECD);
242 /* Rising edge of clock */
243 eecd_reg |= IXGB_EECD_SK;
244 IXGB_WRITE_REG(hw, EECD, eecd_reg);
247 /* Falling edge of clock */
248 eecd_reg &= ~IXGB_EECD_SK;
249 IXGB_WRITE_REG(hw, EECD, eecd_reg);
254 /******************************************************************************
255 * Terminates a command by lowering the EEPROM's chip select pin
257 * hw - Struct containing variables accessed by shared code
258 *****************************************************************************/
260 ixgb_cleanup_eeprom(struct ixgb_hw *hw)
264 eecd_reg = IXGB_READ_REG(hw, EECD);
266 eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_DI);
268 IXGB_WRITE_REG(hw, EECD, eecd_reg);
270 ixgb_clock_eeprom(hw);
274 /******************************************************************************
275 * Waits for the EEPROM to finish the current command.
277 * hw - Struct containing variables accessed by shared code
279 * The command is done when the EEPROM's data out pin goes high.
282 * true: EEPROM data pin is high before timeout.
283 * false: Time expired.
284 *****************************************************************************/
286 ixgb_wait_eeprom_command(struct ixgb_hw *hw)
291 /* Toggle the CS line. This in effect tells to EEPROM to actually execute
292 * the command in question.
294 ixgb_standby_eeprom(hw);
296 /* Now read DO repeatedly until is high (equal to '1'). The EEEPROM 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.
300 for(i = 0; i < 200; i++) {
301 eecd_reg = IXGB_READ_REG(hw, EECD);
303 if(eecd_reg & IXGB_EECD_DO)
312 /******************************************************************************
313 * Verifies that the EEPROM has a valid checksum
315 * hw - Struct containing variables accessed by shared code
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
322 * true: Checksum is valid
323 * false: Checksum is not valid.
324 *****************************************************************************/
326 ixgb_validate_eeprom_checksum(struct ixgb_hw *hw)
328 uint16_t checksum = 0;
331 for(i = 0; i < (EEPROM_CHECKSUM_REG + 1); i++)
332 checksum += ixgb_read_eeprom(hw, i);
334 if(checksum == (uint16_t) EEPROM_SUM)
340 /******************************************************************************
341 * Calculates the EEPROM checksum and writes it to the EEPROM
343 * hw - Struct containing variables accessed by shared code
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 *****************************************************************************/
349 ixgb_update_eeprom_checksum(struct ixgb_hw *hw)
351 uint16_t checksum = 0;
354 for(i = 0; i < EEPROM_CHECKSUM_REG; i++)
355 checksum += ixgb_read_eeprom(hw, i);
357 checksum = (uint16_t) EEPROM_SUM - checksum;
359 ixgb_write_eeprom(hw, EEPROM_CHECKSUM_REG, checksum);
363 /******************************************************************************
364 * Writes a 16 bit word to a given offset in the EEPROM.
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 writen to the EEPROM
370 * If ixgb_update_eeprom_checksum is not called after this function, the
371 * EEPROM will most likely contain an invalid checksum.
373 *****************************************************************************/
375 ixgb_write_eeprom(struct ixgb_hw *hw, uint16_t offset, uint16_t data)
377 struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
379 /* Prepare the EEPROM for writing */
380 ixgb_setup_eeprom(hw);
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.
385 ixgb_shift_out_bits(hw, EEPROM_EWEN_OPCODE, 5);
386 ixgb_shift_out_bits(hw, 0, 4);
388 /* Prepare the EEPROM */
389 ixgb_standby_eeprom(hw);
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);
396 ixgb_shift_out_bits(hw, data, 16);
398 ixgb_wait_eeprom_command(hw);
400 /* Recover from write */
401 ixgb_standby_eeprom(hw);
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
407 ixgb_shift_out_bits(hw, EEPROM_EWDS_OPCODE, 5);
408 ixgb_shift_out_bits(hw, 0, 4);
410 /* Done with writing */
411 ixgb_cleanup_eeprom(hw);
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);
419 /******************************************************************************
420 * Reads a 16 bit word from the EEPROM.
422 * hw - Struct containing variables accessed by shared code
423 * offset - offset of 16 bit word in the EEPROM to read
426 * The 16-bit value read from the eeprom
427 *****************************************************************************/
429 ixgb_read_eeprom(struct ixgb_hw *hw,
434 /* Prepare the EEPROM for reading */
435 ixgb_setup_eeprom(hw);
437 /* Send the READ command (opcode + addr) */
438 ixgb_shift_out_bits(hw, EEPROM_READ_OPCODE, 3);
440 * We have a 64 word EEPROM, there are 6 address bits
442 ixgb_shift_out_bits(hw, offset, 6);
445 data = ixgb_shift_in_bits(hw);
447 /* End this read operation */
448 ixgb_standby_eeprom(hw);
453 /******************************************************************************
454 * Reads eeprom and stores data in shared structure.
455 * Validates eeprom checksum and eeprom signature.
457 * hw - Struct containing variables accessed by shared code
460 * true: if eeprom read is successful
462 *****************************************************************************/
464 ixgb_get_eeprom_data(struct ixgb_hw *hw)
467 uint16_t checksum = 0;
468 struct ixgb_ee_map_type *ee_map;
470 DEBUGFUNC("ixgb_get_eeprom_data");
472 ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
474 DEBUGOUT("ixgb_ee: Reading eeprom data\n");
475 for(i = 0; i < IXGB_EEPROM_SIZE ; i++) {
477 ee_data = ixgb_read_eeprom(hw, i);
479 hw->eeprom[i] = cpu_to_le16(ee_data);
482 if (checksum != (uint16_t) EEPROM_SUM) {
483 DEBUGOUT("ixgb_ee: Checksum invalid.\n");
484 /* clear the init_ctrl_reg_1 to signify that the cache is
486 ee_map->init_ctrl_reg_1 = cpu_to_le16(EEPROM_ICW1_SIGNATURE_CLEAR);
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");
499 /******************************************************************************
500 * Local function to check if the eeprom signature is good
501 * If the eeprom signature is good, calls ixgb)get_eeprom_data.
503 * hw - Struct containing variables accessed by shared code
506 * true: eeprom signature was good and the eeprom read was successful
508 ******************************************************************************/
510 ixgb_check_and_get_eeprom_data (struct ixgb_hw* hw)
512 struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
514 if ((ee_map->init_ctrl_reg_1 & cpu_to_le16(EEPROM_ICW1_SIGNATURE_MASK))
515 == cpu_to_le16(EEPROM_ICW1_SIGNATURE_VALID)) {
518 return ixgb_get_eeprom_data(hw);
522 /******************************************************************************
523 * return a word from the eeprom
525 * hw - Struct containing variables accessed by shared code
526 * index - Offset of eeprom word
529 * Word at indexed offset in eeprom, if valid, 0 otherwise.
530 ******************************************************************************/
532 ixgb_get_eeprom_word(struct ixgb_hw *hw, uint16_t index)
535 if ((index < IXGB_EEPROM_SIZE) &&
536 (ixgb_check_and_get_eeprom_data(hw) == true)) {
537 return(hw->eeprom[index]);
543 /******************************************************************************
544 * return the mac address from EEPROM
546 * hw - Struct containing variables accessed by shared code
547 * mac_addr - Ethernet Address if EEPROM contents are valid, 0 otherwise
550 ******************************************************************************/
552 ixgb_get_ee_mac_addr(struct ixgb_hw *hw,
556 struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
558 DEBUGFUNC("ixgb_get_ee_mac_addr");
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]);
569 /******************************************************************************
570 * return the Printed Board Assembly number from EEPROM
572 * hw - Struct containing variables accessed by shared code
575 * PBA number if EEPROM contents are valid, 0 otherwise
576 ******************************************************************************/
578 ixgb_get_ee_pba_number(struct ixgb_hw *hw)
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));
588 /******************************************************************************
589 * return the Device Id from EEPROM
591 * hw - Struct containing variables accessed by shared code
594 * Device Id if EEPROM contents are valid, 0 otherwise
595 ******************************************************************************/
597 ixgb_get_ee_device_id(struct ixgb_hw *hw)
599 struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
601 if (ixgb_check_and_get_eeprom_data(hw) == true)
602 return (le16_to_cpu(ee_map->device_id));