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net: e1000: add support for writing to EEPROM

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Port functions for writing to EEPROM, updating the checksum and
committing data to flash from the Linux kernel igb driver.

Functions were ported from Linux 4.8-rc2 (694d0d0bb20).

Signed-off-by: Hannu Lounento <hannu.lounento@ge.com>
CC: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hannu Lounento 2018-01-10 20:31:24 +01:00 committed by Stefano Babic
parent a61b65ffb5
commit f1bcad22dd
2 changed files with 174 additions and 2 deletions
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173
drivers/net/e1000.c
View file

@ -150,6 +150,7 @@ static int32_t e1000_check_phy_reset_block(struct e1000_hw *hw);
#ifndef CONFIG_E1000_NO_NVM
static void e1000_put_hw_eeprom_semaphore(struct e1000_hw *hw);
static int32_t e1000_get_hw_eeprom_semaphore(struct e1000_hw *hw);
static int32_t e1000_read_eeprom(struct e1000_hw *hw, uint16_t offset,
uint16_t words,
uint16_t *data);
@ -861,6 +862,174 @@ e1000_read_eeprom(struct e1000_hw *hw, uint16_t offset,
return E1000_SUCCESS;
}
#ifndef CONFIG_DM_ETH
/******************************************************************************
* e1000_write_eeprom_srwr - Write to Shadow Ram using EEWR
* @hw: pointer to the HW structure
* @offset: offset within the Shadow Ram to be written to
* @words: number of words to write
* @data: 16 bit word(s) to be written to the Shadow Ram
*
* Writes data to Shadow Ram at offset using EEWR register.
*
* If e1000_update_eeprom_checksum_i210 is not called after this function, the
* Shadow Ram will most likely contain an invalid checksum.
*****************************************************************************/
static int32_t e1000_write_eeprom_srwr(struct e1000_hw *hw, uint16_t offset,
uint16_t words, uint16_t *data)
{
struct e1000_eeprom_info *eeprom = &hw->eeprom;
uint32_t i, k, eewr = 0;
uint32_t attempts = 100000;
int32_t 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 >= eeprom->word_size) ||
(words > (eeprom->word_size - offset)) || (words == 0)) {
DEBUGOUT("nvm parameter(s) out of bounds\n");
ret_val = -E1000_ERR_EEPROM;
goto out;
}
for (i = 0; i < words; i++) {
eewr = ((offset + i) << E1000_EEPROM_RW_ADDR_SHIFT)
| (data[i] << E1000_EEPROM_RW_REG_DATA) |
E1000_EEPROM_RW_REG_START;
E1000_WRITE_REG(hw, I210_EEWR, eewr);
for (k = 0; k < attempts; k++) {
if (E1000_EEPROM_RW_REG_DONE &
E1000_READ_REG(hw, I210_EEWR)) {
ret_val = 0;
break;
}
udelay(5);
}
if (ret_val) {
DEBUGOUT("Shadow RAM write EEWR timed out\n");
break;
}
}
out:
return ret_val;
}
/******************************************************************************
* e1000_pool_flash_update_done_i210 - Pool FLUDONE status.
* @hw: pointer to the HW structure
*
*****************************************************************************/
static int32_t e1000_pool_flash_update_done_i210(struct e1000_hw *hw)
{
int32_t ret_val = -E1000_ERR_EEPROM;
uint32_t i, reg;
for (i = 0; i < E1000_FLUDONE_ATTEMPTS; i++) {
reg = E1000_READ_REG(hw, EECD);
if (reg & E1000_EECD_FLUDONE_I210) {
ret_val = 0;
break;
}
udelay(5);
}
return ret_val;
}
/******************************************************************************
* e1000_update_flash_i210 - Commit EEPROM to the flash
* @hw: pointer to the HW structure
*
*****************************************************************************/
static int32_t e1000_update_flash_i210(struct e1000_hw *hw)
{
int32_t ret_val = 0;
uint32_t flup;
ret_val = e1000_pool_flash_update_done_i210(hw);
if (ret_val == -E1000_ERR_EEPROM) {
DEBUGOUT("Flash update time out\n");
goto out;
}
flup = E1000_READ_REG(hw, EECD) | E1000_EECD_FLUPD_I210;
E1000_WRITE_REG(hw, EECD, flup);
ret_val = e1000_pool_flash_update_done_i210(hw);
if (ret_val)
DEBUGOUT("Flash update time out\n");
else
DEBUGOUT("Flash update complete\n");
out:
return ret_val;
}
/******************************************************************************
* e1000_update_eeprom_checksum_i210 - 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. Next commit EEPROM data onto the Flash.
*****************************************************************************/
static int32_t e1000_update_eeprom_checksum_i210(struct e1000_hw *hw)
{
int32_t ret_val = 0;
uint16_t checksum = 0;
uint16_t i, nvm_data;
/* Read the first word from the EEPROM. If this times out or fails, do
* not continue or we could be in for a very long wait while every
* EEPROM read fails
*/
ret_val = e1000_read_eeprom_eerd(hw, 0, 1, &nvm_data);
if (ret_val) {
DEBUGOUT("EEPROM read failed\n");
goto out;
}
if (!(e1000_get_hw_eeprom_semaphore(hw))) {
/* Do not use hw->nvm.ops.write, hw->nvm.ops.read
* because we do not want to take the synchronization
* semaphores twice here.
*/
for (i = 0; i < EEPROM_CHECKSUM_REG; i++) {
ret_val = e1000_read_eeprom_eerd(hw, i, 1, &nvm_data);
if (ret_val) {
e1000_put_hw_eeprom_semaphore(hw);
DEBUGOUT("EEPROM Read Error while updating checksum.\n");
goto out;
}
checksum += nvm_data;
}
checksum = (uint16_t)EEPROM_SUM - checksum;
ret_val = e1000_write_eeprom_srwr(hw, EEPROM_CHECKSUM_REG, 1,
&checksum);
if (ret_val) {
e1000_put_hw_eeprom_semaphore(hw);
DEBUGOUT("EEPROM Write Error while updating checksum.\n");
goto out;
}
e1000_put_hw_eeprom_semaphore(hw);
ret_val = e1000_update_flash_i210(hw);
} else {
ret_val = -E1000_ERR_SWFW_SYNC;
}
out:
return ret_val;
}
#endif
/******************************************************************************
* Verifies that the EEPROM has a valid checksum
*
@ -970,7 +1139,7 @@ e1000_get_software_semaphore(struct e1000_hw *hw)
DEBUGFUNC();
if (hw->mac_type != e1000_80003es2lan)
if (hw->mac_type != e1000_80003es2lan && hw->mac_type != e1000_igb)
return E1000_SUCCESS;
while (timeout) {
@ -1044,7 +1213,7 @@ e1000_get_hw_eeprom_semaphore(struct e1000_hw *hw)
if (!hw->eeprom_semaphore_present)
return E1000_SUCCESS;
if (hw->mac_type == e1000_80003es2lan) {
if (hw->mac_type == e1000_80003es2lan || hw->mac_type == e1000_igb) {
/* Get the SW semaphore. */
if (e1000_get_software_semaphore(hw) != E1000_SUCCESS)
return -E1000_ERR_EEPROM;

3
drivers/net/e1000.h
View file

@ -1242,6 +1242,9 @@ struct e1000_hw {
#define E1000_EECD_SELSHAD 0x00020000 /* Select Shadow RAM */
#define E1000_EECD_INITSRAM 0x00040000 /* Initialize Shadow RAM */
#define E1000_EECD_FLUPD 0x00080000 /* Update FLASH */
#define E1000_EECD_FLUPD_I210 0x00800000 /* Update FLASH */
#define E1000_EECD_FLUDONE_I210 0x04000000 /* Update FLASH done*/
#define E1000_FLUDONE_ATTEMPTS 20000
#define E1000_EECD_AUPDEN 0x00100000 /* Enable Autonomous FLASH update */
#define E1000_EECD_SHADV 0x00200000 /* Shadow RAM Data Valid */
#define E1000_EECD_SEC1VAL 0x00400000 /* Sector One Valid */