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path: root/drivers/net/igb/e1000_nvm.c
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Diffstat (limited to 'drivers/net/igb/e1000_nvm.c')
-rw-r--r--drivers/net/igb/e1000_nvm.c64
1 files changed, 63 insertions, 1 deletions
diff --git a/drivers/net/igb/e1000_nvm.c b/drivers/net/igb/e1000_nvm.c
index 6b5cc2cc453d..75bf36a4baee 100644
--- a/drivers/net/igb/e1000_nvm.c
+++ b/drivers/net/igb/e1000_nvm.c
@@ -318,6 +318,68 @@ out:
}
/**
+ * 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
@@ -353,7 +415,7 @@ s32 igb_read_nvm_eerd(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
break;
data[i] = (rd32(E1000_EERD) >>
- E1000_NVM_RW_REG_DATA);
+ E1000_NVM_RW_REG_DATA);
}
out: