igb: Add new function to read part number from EEPROM in string format

New adapters will have part numbers stored in string format rather than
simple hex format. This function will read part number formats in either
hex or string.
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/igb/e1000_defines.h

@@ -419,6 +419,9 @@
 #define E1000_ERR_SWFW_SYNC 13
 #define E1000_NOT_IMPLEMENTED 14
 #define E1000_ERR_MBX      15
+#define E1000_ERR_INVALID_ARGUMENT  16
+#define E1000_ERR_NO_SPACE          17
+#define E1000_ERR_NVM_PBA_SECTION   18
 
 /* Loop limit on how long we wait for auto-negotiation to complete */
 #define COPPER_LINK_UP_LIMIT              10
@@ -580,11 +583,15 @@
 
 /* Mask bits for fields in Word 0x1a of the NVM */
 
+/* length of string needed to store part num */
+#define E1000_PBANUM_LENGTH         11
+
 /* For checksumming, the sum of all words in the NVM should equal 0xBABA. */
 #define NVM_SUM                    0xBABA
 
 #define NVM_PBA_OFFSET_0           8
 #define NVM_PBA_OFFSET_1           9
+#define NVM_PBA_PTR_GUARD          0xFAFA
 #define NVM_WORD_SIZE_BASE_SHIFT   6
 
 /* NVM Commands - Microwire */

drivers/net/igb/e1000_nvm.c

@@ -445,31 +445,112 @@ s32 igb_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
 }
 
 /**
- *  igb_read_part_num - Read device part number
+ *  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_num(struct e1000_hw *hw, u32 *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;
 	}
-	*part_num = (u32)(nvm_data << 16);
 
-	ret_val = hw->nvm.ops.read(hw, NVM_PBA_OFFSET_1, 1, &nvm_data);
+	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 |= nvm_data;
+		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;

drivers/net/igb/e1000_nvm.h

@@ -32,6 +32,8 @@ s32  igb_acquire_nvm(struct e1000_hw *hw);
 void igb_release_nvm(struct e1000_hw *hw);
 s32  igb_read_mac_addr(struct e1000_hw *hw);
 s32  igb_read_part_num(struct e1000_hw *hw, u32 *part_num);
+s32  igb_read_part_string(struct e1000_hw *hw, u8 *part_num,
+                          u32 part_num_size);
 s32  igb_read_nvm_eerd(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
 s32  igb_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
 s32  igb_validate_nvm_checksum(struct e1000_hw *hw);

drivers/net/igb/igb_main.c

@@ -1729,12 +1729,13 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 	struct igb_adapter *adapter;
 	struct e1000_hw *hw;
 	u16 eeprom_data = 0;
+	s32 ret_val;
 	static int global_quad_port_a; /* global quad port a indication */
 	const struct e1000_info *ei = igb_info_tbl[ent->driver_data];
 	unsigned long mmio_start, mmio_len;
 	int err, pci_using_dac;
 	u16 eeprom_apme_mask = IGB_EEPROM_APME;
-	u32 part_num;
+	u8 part_str[E1000_PBANUM_LENGTH];
 
 	/* Catch broken hardware that put the wrong VF device ID in
 	 * the PCIe SR-IOV capability.
@@ -2000,10 +2001,10 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 		   "unknown"),
 		 netdev->dev_addr);
 
-	igb_read_part_num(hw, &part_num);
-	dev_info(&pdev->dev, "%s: PBA No: %06x-%03x\n", netdev->name,
-		(part_num >> 8), (part_num & 0xff));
-
+	ret_val = igb_read_part_string(hw, part_str, E1000_PBANUM_LENGTH);
+	if (ret_val)
+		strcpy(part_str, "Unknown");
+	dev_info(&pdev->dev, "%s: PBA No: %s\n", netdev->name, part_str);
 	dev_info(&pdev->dev,
 		"Using %s interrupts. %d rx queue(s), %d tx queue(s)\n",
 		adapter->msix_entries ? "MSI-X" :