// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */
#include "e1000.h"
/**
* e1000_raise_eec_clk - Raise EEPROM clock
* @ hw : pointer to the HW structure
* @ eecd : pointer to the EEPROM
*
* Enable / Raise the EEPROM clock bit .
**/
static void e1000_raise_eec_clk(struct e1000_hw *hw, u32 *eecd)
{
*eecd = *eecd | E1000_EECD_SK;
ew32(EECD, *eecd);
e1e_flush();
udelay(hw->nvm.delay_usec);
}
/**
* e1000_lower_eec_clk - Lower EEPROM clock
* @ hw : pointer to the HW structure
* @ eecd : pointer to the EEPROM
*
* Clear / Lower the EEPROM clock bit .
**/
static void e1000_lower_eec_clk(struct e1000_hw *hw, u32 *eecd)
{
*eecd = *eecd & ~E1000_EECD_SK;
ew32(EECD, *eecd);
e1e_flush();
udelay(hw->nvm.delay_usec);
}
/**
* e1000_shift_out_eec_bits - Shift data bits our to the EEPROM
* @ hw : pointer to the HW structure
* @ data : data to send to the EEPROM
* @ count : number of bits to shift out
*
* We need to shift ' count ' bits out to the EEPROM . So , the 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 .
**/
static void e1000_shift_out_eec_bits(struct e1000_hw *hw, u16 data, u16 count)
{
struct e1000_nvm_info *nvm = &hw->nvm;
u32 eecd = er32(EECD);
u32 mask;
mask = BIT(count - 1 );
if (nvm->type == e1000_nvm_eeprom_spi)
eecd |= E1000_EECD_DO;
do {
eecd &= ~E1000_EECD_DI;
if (data & mask)
eecd |= E1000_EECD_DI;
ew32(EECD, eecd);
e1e_flush();
udelay(nvm->delay_usec);
e1000_raise_eec_clk(hw, &eecd);
e1000_lower_eec_clk(hw, &eecd);
mask >>= 1 ;
} while (mask);
eecd &= ~E1000_EECD_DI;
ew32(EECD, eecd);
}
/**
* e1000_shift_in_eec_bits - Shift data bits in from the EEPROM
* @ hw : pointer to the HW structure
* @ count : number of bits to shift in
*
* In order to read a register from the EEPROM , we need to shift ' count ' 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 data out
* " DO " bit . During this " shifting in " process the data in " DI " bit should
* always be clear .
**/
static u16 e1000_shift_in_eec_bits(struct e1000_hw *hw, u16 count)
{
u32 eecd;
u32 i;
u16 data;
eecd = er32(EECD);
eecd &= ~(E1000_EECD_DO | E1000_EECD_DI);
data = 0 ;
for (i = 0 ; i < count; i++) {
data <<= 1 ;
e1000_raise_eec_clk(hw, &eecd);
eecd = er32(EECD);
eecd &= ~E1000_EECD_DI;
if (eecd & E1000_EECD_DO)
data |= 1 ;
e1000_lower_eec_clk(hw, &eecd);
}
return data;
}
/**
* e1000e_poll_eerd_eewr_done - Poll for EEPROM read / write completion
* @ hw : pointer to the HW structure
* @ ee_reg : EEPROM flag for polling
*
* Polls the EEPROM status bit for either read or write completion based
* upon the value of ' ee_reg ' .
**/
s32 e1000e_poll_eerd_eewr_done(struct e1000_hw *hw, int ee_reg)
{
u32 attempts = 100000 ;
u32 i, reg = 0 ;
for (i = 0 ; i < attempts; i++) {
if (ee_reg == E1000_NVM_POLL_READ)
reg = er32(EERD);
else
reg = er32(EEWR);
if (reg & E1000_NVM_RW_REG_DONE)
return 0 ;
udelay(5 );
}
return -E1000_ERR_NVM;
}
/**
* e1000e_acquire_nvm - Generic request for access to EEPROM
* @ hw : pointer to the HW structure
*
* Set the EEPROM access request bit and wait for EEPROM access grant bit .
* Return successful if access grant bit set , else clear the request for
* EEPROM access and return - E1000_ERR_NVM ( - 1 ) .
**/
s32 e1000e_acquire_nvm(struct e1000_hw *hw)
{
u32 eecd = er32(EECD);
s32 timeout = E1000_NVM_GRANT_ATTEMPTS;
ew32(EECD, eecd | E1000_EECD_REQ);
eecd = er32(EECD);
while (timeout) {
if (eecd & E1000_EECD_GNT)
break ;
udelay(5 );
eecd = er32(EECD);
timeout--;
}
if (!timeout) {
eecd &= ~E1000_EECD_REQ;
ew32(EECD, eecd);
e_dbg("Could not acquire NVM grant\n" );
return -E1000_ERR_NVM;
}
return 0 ;
}
/**
* e1000_standby_nvm - Return EEPROM to standby state
* @ hw : pointer to the HW structure
*
* Return the EEPROM to a standby state .
**/
static void e1000_standby_nvm(struct e1000_hw *hw)
{
struct e1000_nvm_info *nvm = &hw->nvm;
u32 eecd = er32(EECD);
if (nvm->type == e1000_nvm_eeprom_spi) {
/* Toggle CS to flush commands */
eecd |= E1000_EECD_CS;
ew32(EECD, eecd);
e1e_flush();
udelay(nvm->delay_usec);
eecd &= ~E1000_EECD_CS;
ew32(EECD, eecd);
e1e_flush();
udelay(nvm->delay_usec);
}
}
/**
* e1000_stop_nvm - Terminate EEPROM command
* @ hw : pointer to the HW structure
*
* Terminates the current command by inverting the EEPROM ' s chip select pin .
**/
static void e1000_stop_nvm(struct e1000_hw *hw)
{
u32 eecd;
eecd = er32(EECD);
if (hw->nvm.type == e1000_nvm_eeprom_spi) {
/* Pull CS high */
eecd |= E1000_EECD_CS;
e1000_lower_eec_clk(hw, &eecd);
}
}
/**
* e1000e_release_nvm - Release exclusive access to EEPROM
* @ hw : pointer to the HW structure
*
* Stop any current commands to the EEPROM and clear the EEPROM request bit .
**/
void e1000e_release_nvm(struct e1000_hw *hw)
{
u32 eecd;
e1000_stop_nvm(hw);
eecd = er32(EECD);
eecd &= ~E1000_EECD_REQ;
ew32(EECD, eecd);
}
/**
* e1000_ready_nvm_eeprom - Prepares EEPROM for read / write
* @ hw : pointer to the HW structure
*
* Setups the EEPROM for reading and writing .
**/
static s32 e1000_ready_nvm_eeprom(struct e1000_hw *hw)
{
struct e1000_nvm_info *nvm = &hw->nvm;
u32 eecd = er32(EECD);
u8 spi_stat_reg;
if (nvm->type == e1000_nvm_eeprom_spi) {
u16 timeout = NVM_MAX_RETRY_SPI;
/* Clear SK and CS */
eecd &= ~(E1000_EECD_CS | E1000_EECD_SK);
ew32(EECD, eecd);
e1e_flush();
udelay(1 );
/* Read "Status Register" repeatedly until the LSB is cleared.
* The EEPROM will signal that the command has been completed
* by clearing bit 0 of the internal status register . If it ' s
* not cleared within ' timeout ' , then error out .
*/
while (timeout) {
e1000_shift_out_eec_bits(hw, NVM_RDSR_OPCODE_SPI,
hw->nvm.opcode_bits);
spi_stat_reg = (u8)e1000_shift_in_eec_bits(hw, 8 );
if (!(spi_stat_reg & NVM_STATUS_RDY_SPI))
break ;
udelay(5 );
e1000_standby_nvm(hw);
timeout--;
}
if (!timeout) {
e_dbg("SPI NVM Status error\n" );
return -E1000_ERR_NVM;
}
}
return 0 ;
}
/**
* e1000e_read_nvm_eerd - Reads EEPROM using EERD register
* @ hw : pointer to the HW structure
* @ offset : offset of word in the EEPROM to read
* @ words : number of words to read
* @ data : word read from the EEPROM
*
* Reads a 16 bit word from the EEPROM using the EERD register .
**/
s32 e1000e_read_nvm_eerd(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
struct e1000_nvm_info *nvm = &hw->nvm;
u32 i, eerd = 0 ;
s32 ret_val = 0 ;
/* A check for invalid values: offset too large, too many words,
* too many words for the offset , and not enough words .
*/
if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||
(words == 0 )) {
e_dbg("nvm parameter(s) out of bounds\n" );
return -E1000_ERR_NVM;
}
for (i = 0 ; i < words; i++) {
eerd = ((offset + i) << E1000_NVM_RW_ADDR_SHIFT) +
E1000_NVM_RW_REG_START;
ew32(EERD, eerd);
ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_READ);
if (ret_val) {
e_dbg("NVM read error: %d\n" , ret_val);
break ;
}
data[i] = (er32(EERD) >> E1000_NVM_RW_REG_DATA);
}
return ret_val;
}
/**
* e1000e_write_nvm_spi - Write to EEPROM using SPI
* @ hw : pointer to the HW structure
* @ offset : offset within the EEPROM to be written to
* @ words : number of words to write
* @ data : 16 bit word ( s ) to be written to the EEPROM
*
* Writes data to EEPROM at offset using SPI interface .
*
* If e1000e_update_nvm_checksum is not called after this function , the
* EEPROM will most likely contain an invalid checksum .
**/
s32 e1000e_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
struct e1000_nvm_info *nvm = &hw->nvm;
s32 ret_val = -E1000_ERR_NVM;
u16 widx = 0 ;
/* A check for invalid values: offset too large, too many words,
* and not enough words .
*/
if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||
(words == 0 )) {
e_dbg("nvm parameter(s) out of bounds\n" );
return -E1000_ERR_NVM;
}
while (widx < words) {
u8 write_opcode = NVM_WRITE_OPCODE_SPI;
ret_val = nvm->ops.acquire(hw);
if (ret_val)
return ret_val;
ret_val = e1000_ready_nvm_eeprom(hw);
if (ret_val) {
nvm->ops.release(hw);
return ret_val;
}
e1000_standby_nvm(hw);
/* Send the WRITE ENABLE command (8 bit opcode) */
e1000_shift_out_eec_bits(hw, NVM_WREN_OPCODE_SPI,
nvm->opcode_bits);
e1000_standby_nvm(hw);
/* Some SPI eeproms use the 8th address bit embedded in the
* opcode
*/
if ((nvm->address_bits == 8 ) && (offset >= 128 ))
write_opcode |= NVM_A8_OPCODE_SPI;
/* Send the Write command (8-bit opcode + addr) */
e1000_shift_out_eec_bits(hw, write_opcode, nvm->opcode_bits);
e1000_shift_out_eec_bits(hw, (u16)((offset + widx) * 2 ),
nvm->address_bits);
/* Loop to allow for up to whole page write of eeprom */
while (widx < words) {
u16 word_out = data[widx];
word_out = (word_out >> 8 ) | (word_out << 8 );
e1000_shift_out_eec_bits(hw, word_out, 16 );
widx++;
if ((((offset + widx) * 2 ) % nvm->page_size) == 0 ) {
e1000_standby_nvm(hw);
break ;
}
}
usleep_range(10000 , 11000 );
nvm->ops.release(hw);
}
return ret_val;
}
/**
* e1000_read_pba_string_generic - Read device part number
* @ hw : pointer to the HW structure
* @ pba_num : pointer to device part number
* @ pba_num_size : size of part number buffer
*
* Reads the product board assembly ( PBA ) number from the EEPROM and stores
* the value in pba_num .
**/
s32 e1000_read_pba_string_generic(struct e1000_hw *hw, u8 *pba_num,
u32 pba_num_size)
{
s32 ret_val;
u16 nvm_data;
u16 pba_ptr;
u16 offset;
u16 length;
if (pba_num == NULL) {
e_dbg("PBA string buffer was null\n" );
return -E1000_ERR_INVALID_ARGUMENT;
}
ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_0, 1 , &nvm_data);
if (ret_val) {
e_dbg("NVM Read Error\n" );
return ret_val;
}
ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_1, 1 , &pba_ptr);
if (ret_val) {
e_dbg("NVM Read Error\n" );
return ret_val;
}
/* if nvm_data is not ptr guard the PBA must be in legacy format which
* means pba_ptr is actually our second data word for the PBA number
* and we can decode it into an ascii string
*/
if (nvm_data != NVM_PBA_PTR_GUARD) {
e_dbg("NVM PBA number is not stored as string\n" );
/* make sure callers buffer is big enough to store the PBA */
if (pba_num_size < E1000_PBANUM_LENGTH) {
e_dbg("PBA string buffer too small\n" );
return E1000_ERR_NO_SPACE;
}
/* extract hex string from data and pba_ptr */
pba_num[0 ] = (nvm_data >> 12 ) & 0 xF;
pba_num[1 ] = (nvm_data >> 8 ) & 0 xF;
pba_num[2 ] = (nvm_data >> 4 ) & 0 xF;
pba_num[3 ] = nvm_data & 0 xF;
pba_num[4 ] = (pba_ptr >> 12 ) & 0 xF;
pba_num[5 ] = (pba_ptr >> 8 ) & 0 xF;
pba_num[6 ] = '-' ;
pba_num[7 ] = 0 ;
pba_num[8 ] = (pba_ptr >> 4 ) & 0 xF;
pba_num[9 ] = pba_ptr & 0 xF;
/* put a null character on the end of our string */
pba_num[10 ] = '\0' ;
/* switch all the data but the '-' to hex char */
for (offset = 0 ; offset < 10 ; offset++) {
if (pba_num[offset] < 0 xA)
pba_num[offset] += '0' ;
else if (pba_num[offset] < 0 x10)
pba_num[offset] += 'A' - 0 xA;
}
return 0 ;
}
ret_val = e1000_read_nvm(hw, pba_ptr, 1 , &length);
if (ret_val) {
e_dbg("NVM Read Error\n" );
return ret_val;
}
if (length == 0 xFFFF || length == 0 ) {
e_dbg("NVM PBA number section invalid length\n" );
return -E1000_ERR_NVM_PBA_SECTION;
}
/* check if pba_num buffer is big enough */
if (pba_num_size < (((u32)length * 2 ) - 1 )) {
e_dbg("PBA string buffer too small\n" );
return -E1000_ERR_NO_SPACE;
}
/* trim pba length from start of string */
pba_ptr++;
length--;
for (offset = 0 ; offset < length; offset++) {
ret_val = e1000_read_nvm(hw, pba_ptr + offset, 1 , &nvm_data);
if (ret_val) {
e_dbg("NVM Read Error\n" );
return ret_val;
}
pba_num[offset * 2 ] = (u8)(nvm_data >> 8 );
pba_num[(offset * 2 ) + 1 ] = (u8)(nvm_data & 0 xFF);
}
pba_num[offset * 2 ] = '\0' ;
return 0 ;
}
/**
* e1000_read_mac_addr_generic - Read device MAC address
* @ hw : pointer to the HW structure
*
* Reads the device MAC address from the EEPROM and stores the value .
* Since devices with two ports use the same EEPROM , we increment the
* last bit in the MAC address for the second port .
**/
s32 e1000_read_mac_addr_generic(struct e1000_hw *hw)
{
u32 rar_high;
u32 rar_low;
u16 i;
rar_high = er32(RAH(0 ));
rar_low = er32(RAL(0 ));
for (i = 0 ; i < E1000_RAL_MAC_ADDR_LEN; i++)
hw->mac.perm_addr[i] = (u8)(rar_low >> (i * 8 ));
for (i = 0 ; i < E1000_RAH_MAC_ADDR_LEN; i++)
hw->mac.perm_addr[i + 4 ] = (u8)(rar_high >> (i * 8 ));
for (i = 0 ; i < ETH_ALEN; i++)
hw->mac.addr[i] = hw->mac.perm_addr[i];
return 0 ;
}
/**
* e1000e_validate_nvm_checksum_generic - Validate EEPROM checksum
* @ hw : pointer to the HW structure
*
* Calculates the EEPROM checksum by reading / adding each word of the EEPROM
* and then verifies that the sum of the EEPROM is equal to 0 xBABA .
**/
s32 e1000e_validate_nvm_checksum_generic(struct e1000_hw *hw)
{
s32 ret_val;
u16 checksum = 0 ;
u16 i, nvm_data;
for (i = 0 ; i < (NVM_CHECKSUM_REG + 1 ); i++) {
ret_val = e1000_read_nvm(hw, i, 1 , &nvm_data);
if (ret_val) {
e_dbg("NVM Read Error\n" );
return ret_val;
}
checksum += nvm_data;
}
if (hw->mac.type == e1000_pch_tgp &&
nvm_data == NVM_CHECKSUM_UNINITIALIZED) {
e_dbg("Uninitialized NVM Checksum on TGP platform - ignoring\n" );
return 0 ;
}
if (checksum != (u16)NVM_SUM) {
e_dbg("NVM Checksum Invalid\n" );
return -E1000_ERR_NVM;
}
return 0 ;
}
/**
* e1000e_update_nvm_checksum_generic - Update EEPROM checksum
* @ hw : pointer to the HW structure
*
* Updates the EEPROM checksum by reading / adding each word of the EEPROM
* up to the checksum . Then calculates the EEPROM checksum and writes the
* value to the EEPROM .
**/
s32 e1000e_update_nvm_checksum_generic(struct e1000_hw *hw)
{
s32 ret_val;
u16 checksum = 0 ;
u16 i, nvm_data;
for (i = 0 ; i < NVM_CHECKSUM_REG; i++) {
ret_val = e1000_read_nvm(hw, i, 1 , &nvm_data);
if (ret_val) {
e_dbg("NVM Read Error while updating checksum.\n" );
return ret_val;
}
checksum += nvm_data;
}
checksum = (u16)NVM_SUM - checksum;
ret_val = e1000_write_nvm(hw, NVM_CHECKSUM_REG, 1 , &checksum);
if (ret_val)
e_dbg("NVM Write Error while updating checksum.\n" );
return ret_val;
}
/**
* e1000e_reload_nvm_generic - Reloads EEPROM
* @ hw : pointer to the HW structure
*
* Reloads the EEPROM by setting the " Reinitialize from EEPROM " bit in the
* extended control register .
**/
void e1000e_reload_nvm_generic(struct e1000_hw *hw)
{
u32 ctrl_ext;
usleep_range(10 , 20 );
ctrl_ext = er32(CTRL_EXT);
ctrl_ext |= E1000_CTRL_EXT_EE_RST;
ew32(CTRL_EXT, ctrl_ext);
e1e_flush();
}
Messung V0.5 in Prozent C=95 H=75 G=85
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-10-03)
¤
*© Formatika GbR, Deutschland