Release 4.18 drivers/net/ethernet/intel/ixgb/ixgb_ee.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2008 Intel Corporation. */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "ixgb_hw.h"
#include "ixgb_ee.h"
/* Local prototypes */
static u16 ixgb_shift_in_bits(struct ixgb_hw *hw);

static void ixgb_shift_out_bits(struct ixgb_hw *hw,
				u16 data,
				u16 count);
static void ixgb_standby_eeprom(struct ixgb_hw *hw);

static bool ixgb_wait_eeprom_command(struct ixgb_hw *hw);

static void ixgb_cleanup_eeprom(struct ixgb_hw *hw);

/******************************************************************************
 * Raises the EEPROM's clock input.
 *
 * hw - Struct containing variables accessed by shared code
 * eecd_reg - EECD's current value
 *****************************************************************************/

static void

ixgb_raise_clock(struct ixgb_hw *hw,
		  u32 *eecd_reg)
{
	/* Raise the clock input to the EEPROM (by setting the SK bit), and then
         *  wait 50 microseconds.
         */
	*eecd_reg = *eecd_reg | IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, *eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);
}

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/******************************************************************************
 * Lowers the EEPROM's clock input.
 *
 * hw - Struct containing variables accessed by shared code
 * eecd_reg - EECD's current value
 *****************************************************************************/

static void

ixgb_lower_clock(struct ixgb_hw *hw,
		  u32 *eecd_reg)
{
	/* Lower the clock input to the EEPROM (by clearing the SK bit), and then
         * wait 50 microseconds.
         */
	*eecd_reg = *eecd_reg & ~IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, *eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);
}

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/******************************************************************************
 * Shift data bits out to the EEPROM.
 *
 * hw - Struct containing variables accessed by shared code
 * data - data to send to the EEPROM
 * count - number of bits to shift out
 *****************************************************************************/

static void

ixgb_shift_out_bits(struct ixgb_hw *hw,
					 u16 data,
					 u16 count)
{
	u32 eecd_reg;
	u32 mask;

	/* We need to shift "count" bits out to the EEPROM. So, value in the
         * "data" parameter will be shifted out to the EEPROM one bit at a time.
         * In order to do this, "data" must be broken down into bits.
         */
	mask = 0x01 << (count - 1);
	eecd_reg = IXGB_READ_REG(hw, EECD);
	eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
	do {
		/* A "1" is shifted out to the EEPROM by setting bit "DI" to a "1",
                 * and then raising and then lowering the clock (the SK bit controls
                 * the clock input to the EEPROM).  A "0" is shifted out to the EEPROM
                 * by setting "DI" to "0" and then raising and then lowering the clock.
                 */
		eecd_reg &= ~IXGB_EECD_DI;

		if (data & mask)
			eecd_reg |= IXGB_EECD_DI;

		IXGB_WRITE_REG(hw, EECD, eecd_reg);
		IXGB_WRITE_FLUSH(hw);

		udelay(50);

		ixgb_raise_clock(hw, &eecd_reg);
		ixgb_lower_clock(hw, &eecd_reg);

		mask = mask >> 1;

	} while (mask);

	/* We leave the "DI" bit set to "0" when we leave this routine. */
	eecd_reg &= ~IXGB_EECD_DI;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
}

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/******************************************************************************
 * Shift data bits in from the EEPROM
 *
 * hw - Struct containing variables accessed by shared code
 *****************************************************************************/

static u16

ixgb_shift_in_bits(struct ixgb_hw *hw)
{
	u32 eecd_reg;
	u32 i;
	u16 data;

	/* In order to read a register from the EEPROM, we need to shift 16 bits
         * in from the EEPROM. Bits are "shifted in" by raising the clock input to
         * the EEPROM (setting the SK bit), and then reading the value of the "DO"
         * bit.  During this "shifting in" process the "DI" bit should always be
         * clear..
         */

	eecd_reg = IXGB_READ_REG(hw, EECD);

	eecd_reg &= ~(IXGB_EECD_DO | IXGB_EECD_DI);
	data = 0;

	for (i = 0; i < 16; i++) {
		data = data << 1;
		ixgb_raise_clock(hw, &eecd_reg);

		eecd_reg = IXGB_READ_REG(hw, EECD);

		eecd_reg &= ~(IXGB_EECD_DI);
		if (eecd_reg & IXGB_EECD_DO)
			data |= 1;

		ixgb_lower_clock(hw, &eecd_reg);
	}

	return data;
}

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/******************************************************************************
 * Prepares EEPROM for access
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Lowers EEPROM clock. Clears input pin. Sets the chip select pin. This
 * function should be called before issuing a command to the EEPROM.
 *****************************************************************************/

static void

ixgb_setup_eeprom(struct ixgb_hw *hw)
{
	u32 eecd_reg;

	eecd_reg = IXGB_READ_REG(hw, EECD);

	/*  Clear SK and DI  */
	eecd_reg &= ~(IXGB_EECD_SK | IXGB_EECD_DI);
	IXGB_WRITE_REG(hw, EECD, eecd_reg);

	/*  Set CS  */
	eecd_reg |= IXGB_EECD_CS;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
}

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/******************************************************************************
 * Returns EEPROM to a "standby" state
 *
 * hw - Struct containing variables accessed by shared code
 *****************************************************************************/

static void

ixgb_standby_eeprom(struct ixgb_hw *hw)
{
	u32 eecd_reg;

	eecd_reg = IXGB_READ_REG(hw, EECD);

	/*  Deselect EEPROM  */
	eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_SK);
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);

	/*  Clock high  */
	eecd_reg |= IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);

	/*  Select EEPROM  */
	eecd_reg |= IXGB_EECD_CS;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);

	/*  Clock low  */
	eecd_reg &= ~IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);
}

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/******************************************************************************
 * Raises then lowers the EEPROM's clock pin
 *
 * hw - Struct containing variables accessed by shared code
 *****************************************************************************/

static void

ixgb_clock_eeprom(struct ixgb_hw *hw)
{
	u32 eecd_reg;

	eecd_reg = IXGB_READ_REG(hw, EECD);

	/*  Rising edge of clock  */
	eecd_reg |= IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);

	/*  Falling edge of clock  */
	eecd_reg &= ~IXGB_EECD_SK;
	IXGB_WRITE_REG(hw, EECD, eecd_reg);
	IXGB_WRITE_FLUSH(hw);
	udelay(50);
}

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/******************************************************************************
 * Terminates a command by lowering the EEPROM's chip select pin
 *
 * hw - Struct containing variables accessed by shared code
 *****************************************************************************/

static void

ixgb_cleanup_eeprom(struct ixgb_hw *hw)
{
	u32 eecd_reg;

	eecd_reg = IXGB_READ_REG(hw, EECD);

	eecd_reg &= ~(IXGB_EECD_CS | IXGB_EECD_DI);

	IXGB_WRITE_REG(hw, EECD, eecd_reg);

	ixgb_clock_eeprom(hw);
}

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/******************************************************************************
 * Waits for the EEPROM to finish the current command.
 *
 * hw - Struct containing variables accessed by shared code
 *
 * The command is done when the EEPROM's data out pin goes high.
 *
 * Returns:
 *      true: EEPROM data pin is high before timeout.
 *      false:  Time expired.
 *****************************************************************************/

static bool

ixgb_wait_eeprom_command(struct ixgb_hw *hw)
{
	u32 eecd_reg;
	u32 i;

	/* Toggle the CS line.  This in effect tells to EEPROM to actually execute
         * the command in question.
         */
	ixgb_standby_eeprom(hw);

	/* Now read DO repeatedly until is high (equal to '1').  The EEPROM will
         * signal that the command has been completed by raising the DO signal.
         * If DO does not go high in 10 milliseconds, then error out.
         */
	for (i = 0; i < 200; i++) {
		eecd_reg = IXGB_READ_REG(hw, EECD);

		if (eecd_reg & IXGB_EECD_DO)
			return true;

		udelay(50);
	}
	ASSERT(0);
	return false;
}

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/******************************************************************************
 * Verifies that the EEPROM has a valid checksum
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Reads the first 64 16 bit words of the EEPROM and sums the values read.
 * If the sum of the 64 16 bit words is 0xBABA, the EEPROM's checksum is
 * valid.
 *
 * Returns:
 *  true: Checksum is valid
 *  false: Checksum is not valid.
 *****************************************************************************/

bool

ixgb_validate_eeprom_checksum(struct ixgb_hw *hw)
{
	u16 checksum = 0;
	u16 i;

	for (i = 0; i < (EEPROM_CHECKSUM_REG + 1); i++)
		checksum += ixgb_read_eeprom(hw, i);

	if (checksum == (u16) EEPROM_SUM)
		return true;
	else
		return false;
}

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/******************************************************************************
 * Calculates the EEPROM checksum and writes it to the EEPROM
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Sums the first 63 16 bit words of the EEPROM. Subtracts the sum from 0xBABA.
 * Writes the difference to word offset 63 of the EEPROM.
 *****************************************************************************/

void

ixgb_update_eeprom_checksum(struct ixgb_hw *hw)
{
	u16 checksum = 0;
	u16 i;

	for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
		checksum += ixgb_read_eeprom(hw, i);

	checksum = (u16) EEPROM_SUM - checksum;

	ixgb_write_eeprom(hw, EEPROM_CHECKSUM_REG, checksum);
}

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/******************************************************************************
 * Writes a 16 bit word to a given offset in the EEPROM.
 *
 * hw - Struct containing variables accessed by shared code
 * reg - offset within the EEPROM to be written to
 * data - 16 bit word to be written to the EEPROM
 *
 * If ixgb_update_eeprom_checksum is not called after this function, the
 * EEPROM will most likely contain an invalid checksum.
 *
 *****************************************************************************/

void

ixgb_write_eeprom(struct ixgb_hw *hw, u16 offset, u16 data)
{
	struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;

	/* Prepare the EEPROM for writing */
	ixgb_setup_eeprom(hw);

	/*  Send the 9-bit EWEN (write enable) command to the EEPROM (5-bit opcode
         *  plus 4-bit dummy).  This puts the EEPROM into write/erase mode.
         */
	ixgb_shift_out_bits(hw, EEPROM_EWEN_OPCODE, 5);
	ixgb_shift_out_bits(hw, 0, 4);

	/*  Prepare the EEPROM  */
	ixgb_standby_eeprom(hw);

	/*  Send the Write command (3-bit opcode + 6-bit addr)  */
	ixgb_shift_out_bits(hw, EEPROM_WRITE_OPCODE, 3);
	ixgb_shift_out_bits(hw, offset, 6);

	/*  Send the data  */
	ixgb_shift_out_bits(hw, data, 16);

	ixgb_wait_eeprom_command(hw);

	/*  Recover from write  */
	ixgb_standby_eeprom(hw);

	/* Send the 9-bit EWDS (write disable) command to the EEPROM (5-bit
         * opcode plus 4-bit dummy).  This takes the EEPROM out of write/erase
         * mode.
         */
	ixgb_shift_out_bits(hw, EEPROM_EWDS_OPCODE, 5);
	ixgb_shift_out_bits(hw, 0, 4);

	/*  Done with writing  */
	ixgb_cleanup_eeprom(hw);

	/* clear the init_ctrl_reg_1 to signify that the cache is invalidated */
	ee_map->init_ctrl_reg_1 = cpu_to_le16(EEPROM_ICW1_SIGNATURE_CLEAR);
}

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/******************************************************************************
 * Reads a 16 bit word from the EEPROM.
 *
 * hw - Struct containing variables accessed by shared code
 * offset - offset of 16 bit word in the EEPROM to read
 *
 * Returns:
 *  The 16-bit value read from the eeprom
 *****************************************************************************/

u16

ixgb_read_eeprom(struct ixgb_hw *hw,
		  u16 offset)
{
	u16 data;

	/*  Prepare the EEPROM for reading  */
	ixgb_setup_eeprom(hw);

	/*  Send the READ command (opcode + addr)  */
	ixgb_shift_out_bits(hw, EEPROM_READ_OPCODE, 3);
	/*
         * We have a 64 word EEPROM, there are 6 address bits
         */
	ixgb_shift_out_bits(hw, offset, 6);

	/*  Read the data  */
	data = ixgb_shift_in_bits(hw);

	/*  End this read operation  */
	ixgb_standby_eeprom(hw);

	return data;
}

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/******************************************************************************
 * Reads eeprom and stores data in shared structure.
 * Validates eeprom checksum and eeprom signature.
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Returns:
 *      true: if eeprom read is successful
 *      false: otherwise.
 *****************************************************************************/

bool

ixgb_get_eeprom_data(struct ixgb_hw *hw)
{
	u16 i;
	u16 checksum = 0;
	struct ixgb_ee_map_type *ee_map;

	ENTER();

	ee_map = (struct ixgb_ee_map_type *)hw->eeprom;

	pr_debug("Reading eeprom data\n");
	for (i = 0; i < IXGB_EEPROM_SIZE ; i++) {
		u16 ee_data;
		ee_data = ixgb_read_eeprom(hw, i);
		checksum += ee_data;
		hw->eeprom[i] = cpu_to_le16(ee_data);
	}

	if (checksum != (u16) EEPROM_SUM) {
		pr_debug("Checksum invalid\n");
		/* clear the init_ctrl_reg_1 to signify that the cache is
                 * invalidated */
		ee_map->init_ctrl_reg_1 = cpu_to_le16(EEPROM_ICW1_SIGNATURE_CLEAR);
		return false;
	}

	if ((ee_map->init_ctrl_reg_1 & cpu_to_le16(EEPROM_ICW1_SIGNATURE_MASK))
		 != cpu_to_le16(EEPROM_ICW1_SIGNATURE_VALID)) {
		pr_debug("Signature invalid\n");
		return false;
	}

	return true;
}

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/******************************************************************************
 * Local function to check if the eeprom signature is good
 * If the eeprom signature is good, calls ixgb)get_eeprom_data.
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Returns:
 *      true: eeprom signature was good and the eeprom read was successful
 *      false: otherwise.
 ******************************************************************************/

static bool

ixgb_check_and_get_eeprom_data (struct ixgb_hw* hw)
{
	struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;

	if ((ee_map->init_ctrl_reg_1 & cpu_to_le16(EEPROM_ICW1_SIGNATURE_MASK))
	    == cpu_to_le16(EEPROM_ICW1_SIGNATURE_VALID)) {
		return true;
	} else {
		return ixgb_get_eeprom_data(hw);
	}
}

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/******************************************************************************
 * return a word from the eeprom
 *
 * hw - Struct containing variables accessed by shared code
 * index - Offset of eeprom word
 *
 * Returns:
 *          Word at indexed offset in eeprom, if valid, 0 otherwise.
 ******************************************************************************/

__le16

ixgb_get_eeprom_word(struct ixgb_hw *hw, u16 index)
{

	if (index < IXGB_EEPROM_SIZE && ixgb_check_and_get_eeprom_data(hw))
		return hw->eeprom[index];

	return 0;
}

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/******************************************************************************
 * return the mac address from EEPROM
 *
 * hw       - Struct containing variables accessed by shared code
 * mac_addr - Ethernet Address if EEPROM contents are valid, 0 otherwise
 *
 * Returns: None.
 ******************************************************************************/

void

ixgb_get_ee_mac_addr(struct ixgb_hw *hw,
			u8 *mac_addr)
{
	int i;
	struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;

	ENTER();

	if (ixgb_check_and_get_eeprom_data(hw)) {
		for (i = 0; i < ETH_ALEN; i++) {
			mac_addr[i] = ee_map->mac_addr[i];
		}
		pr_debug("eeprom mac address = %pM\n", mac_addr);
	}
}


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/******************************************************************************
 * return the Printed Board Assembly number from EEPROM
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Returns:
 *          PBA number if EEPROM contents are valid, 0 otherwise
 ******************************************************************************/

u32

ixgb_get_ee_pba_number(struct ixgb_hw *hw)
{
	if (ixgb_check_and_get_eeprom_data(hw))
		return le16_to_cpu(hw->eeprom[EEPROM_PBA_1_2_REG])
			| (le16_to_cpu(hw->eeprom[EEPROM_PBA_3_4_REG])<<16);

	return 0;
}


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/******************************************************************************
 * return the Device Id from EEPROM
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Returns:
 *          Device Id if EEPROM contents are valid, 0 otherwise
 ******************************************************************************/

u16

ixgb_get_ee_device_id(struct ixgb_hw *hw)
{
	struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;

	if (ixgb_check_and_get_eeprom_data(hw))
		return le16_to_cpu(ee_map->device_id);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ganesh Venkatesan
38
90.48%
1
33.33%
Mallikarjuna R Chilakala
3
7.14%
1
33.33%
Joe Perches
1
2.38%
1
33.33%
Total
42
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Ganesh Venkatesan
1273
84.64%
1
7.14%
Joe Perches
75
4.99%
3
21.43%
Jeff Garzik
61
4.06%
3
21.43%
Jesse Brandeburg
49
3.26%
3
21.43%
Mallikarjuna R Chilakala
36
2.39%
2
14.29%
Al Viro
8
0.53%
1
7.14%
Jeff Kirsher
2
0.13%
1
7.14%
Total
1504
100.00%
14
100.00%
Directory: drivers/net/ethernet/intel/ixgb

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