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Diffstat (limited to 'drivers/net/ethernet/intel/igb/e1000_nvm.c')
-rw-r--r--drivers/net/ethernet/intel/igb/e1000_nvm.c713
1 files changed, 713 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igb/e1000_nvm.c b/drivers/net/ethernet/intel/igb/e1000_nvm.c
new file mode 100644
index 000000000000..40407124e722
--- /dev/null
+++ b/drivers/net/ethernet/intel/igb/e1000_nvm.c
@@ -0,0 +1,713 @@
+/*******************************************************************************
+
+ Intel(R) Gigabit Ethernet Linux driver
+ Copyright(c) 2007-2011 Intel Corporation.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms and conditions of the GNU General Public License,
+ version 2, as published by the Free Software Foundation.
+
+ This program is distributed in the hope it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ You should have received a copy of the GNU General Public License along with
+ this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+ The full GNU General Public License is included in this distribution in
+ the file called "COPYING".
+
+ Contact Information:
+ e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#include <linux/if_ether.h>
+#include <linux/delay.h>
+
+#include "e1000_mac.h"
+#include "e1000_nvm.h"
+
+/**
+ * igb_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 igb_raise_eec_clk(struct e1000_hw *hw, u32 *eecd)
+{
+ *eecd = *eecd | E1000_EECD_SK;
+ wr32(E1000_EECD, *eecd);
+ wrfl();
+ udelay(hw->nvm.delay_usec);
+}
+
+/**
+ * igb_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 igb_lower_eec_clk(struct e1000_hw *hw, u32 *eecd)
+{
+ *eecd = *eecd & ~E1000_EECD_SK;
+ wr32(E1000_EECD, *eecd);
+ wrfl();
+ udelay(hw->nvm.delay_usec);
+}
+
+/**
+ * igb_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 igb_shift_out_eec_bits(struct e1000_hw *hw, u16 data, u16 count)
+{
+ struct e1000_nvm_info *nvm = &hw->nvm;
+ u32 eecd = rd32(E1000_EECD);
+ u32 mask;
+
+ mask = 0x01 << (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;
+
+ wr32(E1000_EECD, eecd);
+ wrfl();
+
+ udelay(nvm->delay_usec);
+
+ igb_raise_eec_clk(hw, &eecd);
+ igb_lower_eec_clk(hw, &eecd);
+
+ mask >>= 1;
+ } while (mask);
+
+ eecd &= ~E1000_EECD_DI;
+ wr32(E1000_EECD, eecd);
+}
+
+/**
+ * igb_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 igb_shift_in_eec_bits(struct e1000_hw *hw, u16 count)
+{
+ u32 eecd;
+ u32 i;
+ u16 data;
+
+ eecd = rd32(E1000_EECD);
+
+ eecd &= ~(E1000_EECD_DO | E1000_EECD_DI);
+ data = 0;
+
+ for (i = 0; i < count; i++) {
+ data <<= 1;
+ igb_raise_eec_clk(hw, &eecd);
+
+ eecd = rd32(E1000_EECD);
+
+ eecd &= ~E1000_EECD_DI;
+ if (eecd & E1000_EECD_DO)
+ data |= 1;
+
+ igb_lower_eec_clk(hw, &eecd);
+ }
+
+ return data;
+}
+
+/**
+ * igb_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'.
+ **/
+static s32 igb_poll_eerd_eewr_done(struct e1000_hw *hw, int ee_reg)
+{
+ u32 attempts = 100000;
+ u32 i, reg = 0;
+ s32 ret_val = -E1000_ERR_NVM;
+
+ for (i = 0; i < attempts; i++) {
+ if (ee_reg == E1000_NVM_POLL_READ)
+ reg = rd32(E1000_EERD);
+ else
+ reg = rd32(E1000_EEWR);
+
+ if (reg & E1000_NVM_RW_REG_DONE) {
+ ret_val = 0;
+ break;
+ }
+
+ udelay(5);
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_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 igb_acquire_nvm(struct e1000_hw *hw)
+{
+ u32 eecd = rd32(E1000_EECD);
+ s32 timeout = E1000_NVM_GRANT_ATTEMPTS;
+ s32 ret_val = 0;
+
+
+ wr32(E1000_EECD, eecd | E1000_EECD_REQ);
+ eecd = rd32(E1000_EECD);
+
+ while (timeout) {
+ if (eecd & E1000_EECD_GNT)
+ break;
+ udelay(5);
+ eecd = rd32(E1000_EECD);
+ timeout--;
+ }
+
+ if (!timeout) {
+ eecd &= ~E1000_EECD_REQ;
+ wr32(E1000_EECD, eecd);
+ hw_dbg("Could not acquire NVM grant\n");
+ ret_val = -E1000_ERR_NVM;
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_standby_nvm - Return EEPROM to standby state
+ * @hw: pointer to the HW structure
+ *
+ * Return the EEPROM to a standby state.
+ **/
+static void igb_standby_nvm(struct e1000_hw *hw)
+{
+ struct e1000_nvm_info *nvm = &hw->nvm;
+ u32 eecd = rd32(E1000_EECD);
+
+ if (nvm->type == e1000_nvm_eeprom_spi) {
+ /* Toggle CS to flush commands */
+ eecd |= E1000_EECD_CS;
+ wr32(E1000_EECD, eecd);
+ wrfl();
+ udelay(nvm->delay_usec);
+ eecd &= ~E1000_EECD_CS;
+ wr32(E1000_EECD, eecd);
+ wrfl();
+ 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 = rd32(E1000_EECD);
+ if (hw->nvm.type == e1000_nvm_eeprom_spi) {
+ /* Pull CS high */
+ eecd |= E1000_EECD_CS;
+ igb_lower_eec_clk(hw, &eecd);
+ }
+}
+
+/**
+ * igb_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 igb_release_nvm(struct e1000_hw *hw)
+{
+ u32 eecd;
+
+ e1000_stop_nvm(hw);
+
+ eecd = rd32(E1000_EECD);
+ eecd &= ~E1000_EECD_REQ;
+ wr32(E1000_EECD, eecd);
+}
+
+/**
+ * igb_ready_nvm_eeprom - Prepares EEPROM for read/write
+ * @hw: pointer to the HW structure
+ *
+ * Setups the EEPROM for reading and writing.
+ **/
+static s32 igb_ready_nvm_eeprom(struct e1000_hw *hw)
+{
+ struct e1000_nvm_info *nvm = &hw->nvm;
+ u32 eecd = rd32(E1000_EECD);
+ s32 ret_val = 0;
+ u16 timeout = 0;
+ u8 spi_stat_reg;
+
+
+ if (nvm->type == e1000_nvm_eeprom_spi) {
+ /* Clear SK and CS */
+ eecd &= ~(E1000_EECD_CS | E1000_EECD_SK);
+ wr32(E1000_EECD, eecd);
+ wrfl();
+ udelay(1);
+ timeout = NVM_MAX_RETRY_SPI;
+
+ /*
+ * 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) {
+ igb_shift_out_eec_bits(hw, NVM_RDSR_OPCODE_SPI,
+ hw->nvm.opcode_bits);
+ spi_stat_reg = (u8)igb_shift_in_eec_bits(hw, 8);
+ if (!(spi_stat_reg & NVM_STATUS_RDY_SPI))
+ break;
+
+ udelay(5);
+ igb_standby_nvm(hw);
+ timeout--;
+ }
+
+ if (!timeout) {
+ hw_dbg("SPI NVM Status error\n");
+ ret_val = -E1000_ERR_NVM;
+ goto out;
+ }
+ }
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_read_nvm_spi - Read EEPROM's using SPI
+ * @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.
+ **/
+s32 igb_read_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
+{
+ struct e1000_nvm_info *nvm = &hw->nvm;
+ u32 i = 0;
+ s32 ret_val;
+ u16 word_in;
+ u8 read_opcode = NVM_READ_OPCODE_SPI;
+
+ /*
+ * 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)) {
+ hw_dbg("nvm parameter(s) out of bounds\n");
+ ret_val = -E1000_ERR_NVM;
+ goto out;
+ }
+
+ ret_val = nvm->ops.acquire(hw);
+ if (ret_val)
+ goto out;
+
+ ret_val = igb_ready_nvm_eeprom(hw);
+ if (ret_val)
+ goto release;
+
+ igb_standby_nvm(hw);
+
+ if ((nvm->address_bits == 8) && (offset >= 128))
+ read_opcode |= NVM_A8_OPCODE_SPI;
+
+ /* Send the READ command (opcode + addr) */
+ igb_shift_out_eec_bits(hw, read_opcode, nvm->opcode_bits);
+ igb_shift_out_eec_bits(hw, (u16)(offset*2), nvm->address_bits);
+
+ /*
+ * Read the data. SPI NVMs increment the address with each byte
+ * read and will roll over if reading beyond the end. This allows
+ * us to read the whole NVM from any offset
+ */
+ for (i = 0; i < words; i++) {
+ word_in = igb_shift_in_eec_bits(hw, 16);
+ data[i] = (word_in >> 8) | (word_in << 8);
+ }
+
+release:
+ nvm->ops.release(hw);
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_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 igb_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,
+ * and not enough words.
+ */
+ if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||
+ (words == 0)) {
+ hw_dbg("nvm parameter(s) out of bounds\n");
+ ret_val = -E1000_ERR_NVM;
+ goto out;
+ }
+
+ for (i = 0; i < words; i++) {
+ eerd = ((offset+i) << E1000_NVM_RW_ADDR_SHIFT) +
+ E1000_NVM_RW_REG_START;
+
+ wr32(E1000_EERD, eerd);
+ ret_val = igb_poll_eerd_eewr_done(hw, E1000_NVM_POLL_READ);
+ if (ret_val)
+ break;
+
+ data[i] = (rd32(E1000_EERD) >>
+ E1000_NVM_RW_REG_DATA);
+ }
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_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 e1000_update_nvm_checksum is not called after this function , the
+ * EEPROM will most likley contain an invalid checksum.
+ **/
+s32 igb_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
+{
+ struct e1000_nvm_info *nvm = &hw->nvm;
+ s32 ret_val;
+ 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)) {
+ hw_dbg("nvm parameter(s) out of bounds\n");
+ ret_val = -E1000_ERR_NVM;
+ goto out;
+ }
+
+ ret_val = hw->nvm.ops.acquire(hw);
+ if (ret_val)
+ goto out;
+
+ msleep(10);
+
+ while (widx < words) {
+ u8 write_opcode = NVM_WRITE_OPCODE_SPI;
+
+ ret_val = igb_ready_nvm_eeprom(hw);
+ if (ret_val)
+ goto release;
+
+ igb_standby_nvm(hw);
+
+ /* Send the WRITE ENABLE command (8 bit opcode) */
+ igb_shift_out_eec_bits(hw, NVM_WREN_OPCODE_SPI,
+ nvm->opcode_bits);
+
+ igb_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) */
+ igb_shift_out_eec_bits(hw, write_opcode, nvm->opcode_bits);
+ igb_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);
+ igb_shift_out_eec_bits(hw, word_out, 16);
+ widx++;
+
+ if ((((offset + widx) * 2) % nvm->page_size) == 0) {
+ igb_standby_nvm(hw);
+ break;
+ }
+ }
+ }
+
+ msleep(10);
+release:
+ hw->nvm.ops.release(hw);
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_read_part_string - Read device part number
+ * @hw: pointer to the HW structure
+ * @part_num: pointer to device part number
+ * @part_num_size: size of part number buffer
+ *
+ * Reads the product board assembly (PBA) number from the EEPROM and stores
+ * the value in part_num.
+ **/
+s32 igb_read_part_string(struct e1000_hw *hw, u8 *part_num, u32 part_num_size)
+{
+ s32 ret_val;
+ u16 nvm_data;
+ u16 pointer;
+ u16 offset;
+ u16 length;
+
+ if (part_num == NULL) {
+ hw_dbg("PBA string buffer was null\n");
+ ret_val = E1000_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
+
+ ret_val = hw->nvm.ops.read(hw, NVM_PBA_OFFSET_0, 1, &nvm_data);
+ if (ret_val) {
+ hw_dbg("NVM Read Error\n");
+ goto out;
+ }
+
+ ret_val = hw->nvm.ops.read(hw, NVM_PBA_OFFSET_1, 1, &pointer);
+ if (ret_val) {
+ hw_dbg("NVM Read Error\n");
+ goto out;
+ }
+
+ /*
+ * if nvm_data is not ptr guard the PBA must be in legacy format which
+ * means pointer 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) {
+ hw_dbg("NVM PBA number is not stored as string\n");
+
+ /* we will need 11 characters to store the PBA */
+ if (part_num_size < 11) {
+ hw_dbg("PBA string buffer too small\n");
+ return E1000_ERR_NO_SPACE;
+ }
+
+ /* extract hex string from data and pointer */
+ part_num[0] = (nvm_data >> 12) & 0xF;
+ part_num[1] = (nvm_data >> 8) & 0xF;
+ part_num[2] = (nvm_data >> 4) & 0xF;
+ part_num[3] = nvm_data & 0xF;
+ part_num[4] = (pointer >> 12) & 0xF;
+ part_num[5] = (pointer >> 8) & 0xF;
+ part_num[6] = '-';
+ part_num[7] = 0;
+ part_num[8] = (pointer >> 4) & 0xF;
+ part_num[9] = pointer & 0xF;
+
+ /* put a null character on the end of our string */
+ part_num[10] = '\0';
+
+ /* switch all the data but the '-' to hex char */
+ for (offset = 0; offset < 10; offset++) {
+ if (part_num[offset] < 0xA)
+ part_num[offset] += '0';
+ else if (part_num[offset] < 0x10)
+ part_num[offset] += 'A' - 0xA;
+ }
+
+ goto out;
+ }
+
+ ret_val = hw->nvm.ops.read(hw, pointer, 1, &length);
+ if (ret_val) {
+ hw_dbg("NVM Read Error\n");
+ goto out;
+ }
+
+ if (length == 0xFFFF || length == 0) {
+ hw_dbg("NVM PBA number section invalid length\n");
+ ret_val = E1000_ERR_NVM_PBA_SECTION;
+ goto out;
+ }
+ /* check if part_num buffer is big enough */
+ if (part_num_size < (((u32)length * 2) - 1)) {
+ hw_dbg("PBA string buffer too small\n");
+ ret_val = E1000_ERR_NO_SPACE;
+ goto out;
+ }
+
+ /* trim pba length from start of string */
+ pointer++;
+ length--;
+
+ for (offset = 0; offset < length; offset++) {
+ ret_val = hw->nvm.ops.read(hw, pointer + offset, 1, &nvm_data);
+ if (ret_val) {
+ hw_dbg("NVM Read Error\n");
+ goto out;
+ }
+ part_num[offset * 2] = (u8)(nvm_data >> 8);
+ part_num[(offset * 2) + 1] = (u8)(nvm_data & 0xFF);
+ }
+ part_num[offset * 2] = '\0';
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_read_mac_addr - 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 igb_read_mac_addr(struct e1000_hw *hw)
+{
+ u32 rar_high;
+ u32 rar_low;
+ u16 i;
+
+ rar_high = rd32(E1000_RAH(0));
+ rar_low = rd32(E1000_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;
+}
+
+/**
+ * igb_validate_nvm_checksum - 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 0xBABA.
+ **/
+s32 igb_validate_nvm_checksum(struct e1000_hw *hw)
+{
+ s32 ret_val = 0;
+ u16 checksum = 0;
+ u16 i, nvm_data;
+
+ for (i = 0; i < (NVM_CHECKSUM_REG + 1); i++) {
+ ret_val = hw->nvm.ops.read(hw, i, 1, &nvm_data);
+ if (ret_val) {
+ hw_dbg("NVM Read Error\n");
+ goto out;
+ }
+ checksum += nvm_data;
+ }
+
+ if (checksum != (u16) NVM_SUM) {
+ hw_dbg("NVM Checksum Invalid\n");
+ ret_val = -E1000_ERR_NVM;
+ goto out;
+ }
+
+out:
+ return ret_val;
+}
+
+/**
+ * igb_update_nvm_checksum - 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 igb_update_nvm_checksum(struct e1000_hw *hw)
+{
+ s32 ret_val;
+ u16 checksum = 0;
+ u16 i, nvm_data;
+
+ for (i = 0; i < NVM_CHECKSUM_REG; i++) {
+ ret_val = hw->nvm.ops.read(hw, i, 1, &nvm_data);
+ if (ret_val) {
+ hw_dbg("NVM Read Error while updating checksum.\n");
+ goto out;
+ }
+ checksum += nvm_data;
+ }
+ checksum = (u16) NVM_SUM - checksum;
+ ret_val = hw->nvm.ops.write(hw, NVM_CHECKSUM_REG, 1, &checksum);
+ if (ret_val)
+ hw_dbg("NVM Write Error while updating checksum.\n");
+
+out:
+ return ret_val;
+}
+
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-17 22:49:07 +0300