[U-Boot] [PATCHv2 01/15] net: e1000: add support for writing to EEPROM
Sebastian Reichel
sebastian.reichel at collabora.co.uk
Wed Jan 10 19:31:24 UTC 2018
From: Hannu Lounento <hannu.lounento at ge.com>
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 at ge.com>
CC: Joe Hershberger <joe.hershberger at ni.com>
Signed-off-by: Martyn Welch <martyn.welch at collabora.co.uk>
Reviewed-by: Stefano Babic <sbabic at denx.de>
Acked-by: Joe Hershberger <joe.hershberger at ni.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.co.uk>
---
drivers/net/e1000.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++++-
drivers/net/e1000.h | 3 +
2 files changed, 174 insertions(+), 2 deletions(-)
diff --git a/drivers/net/e1000.c b/drivers/net/e1000.c
index 875682b1b89e..1d9f8f3ae2e4 100644
--- a/drivers/net/e1000.c
+++ b/drivers/net/e1000.c
@@ -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;
diff --git a/drivers/net/e1000.h b/drivers/net/e1000.h
index fcb7df0d83fc..6376de15ada9 100644
--- a/drivers/net/e1000.h
+++ b/drivers/net/e1000.h
@@ -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 */
--
2.15.1
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