e1000e: convert head, tail and itr_register offsets to __iomem pointers

The Tx/Rx head and tail registers and itr_register are always at known
addresses based on the __iomem address at which the PCI region (from BAR 0)
is mapped and known offsets within the region for each of these registers.
Store and use the full address rather than just the region offset to reduce
unnecessary address calculations.  Also, change current u8 __iomem pointers
to void __iomem pointers.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/e1000.h

@@ -242,16 +242,16 @@ struct e1000_ring {
 	u16 next_to_use;
 	u16 next_to_clean;
 
-	u16 head;
-	u16 tail;
+	void __iomem *head;
+	void __iomem *tail;
 
 	/* array of buffer information structs */
 	struct e1000_buffer *buffer_info;
 
 	char name[IFNAMSIZ + 5];
 	u32 ims_val;
 	u32 itr_val;
-	u16 itr_register;
+	void __iomem *itr_register;
 	int set_itr;
 
 	struct sk_buff *rx_skb_top;

drivers/net/ethernet/intel/e1000e/hw.h

@@ -969,8 +969,8 @@ struct e1000_dev_spec_ich8lan {
 struct e1000_hw {
 	struct e1000_adapter *adapter;
 
-	u8 __iomem *hw_addr;
-	u8 __iomem *flash_address;
+	void __iomem *hw_addr;
+	void __iomem *flash_address;
 
 	struct e1000_mac_info  mac;
 	struct e1000_fc_info   fc;

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -550,7 +550,7 @@ static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
  * which has bit 24 set while ME is accessing Host CSR registers, wait
  * if it is set and try again a number of times.
  **/
-static inline s32 e1000e_update_tail_wa(struct e1000_hw *hw, u8 __iomem * tail,
+static inline s32 e1000e_update_tail_wa(struct e1000_hw *hw, void __iomem *tail,
 					unsigned int i)
 {
 	unsigned int j = 0;
@@ -569,10 +569,9 @@ static inline s32 e1000e_update_tail_wa(struct e1000_hw *hw, u8 __iomem * tail,
 
 static void e1000e_update_rdt_wa(struct e1000_adapter *adapter, unsigned int i)
 {
-	u8 __iomem *tail = (adapter->hw.hw_addr + adapter->rx_ring->tail);
 	struct e1000_hw *hw = &adapter->hw;
 
-	if (e1000e_update_tail_wa(hw, tail, i)) {
+	if (e1000e_update_tail_wa(hw, adapter->rx_ring->tail, i)) {
 		u32 rctl = er32(RCTL);
 		ew32(RCTL, rctl & ~E1000_RCTL_EN);
 		e_err("ME firmware caused invalid RDT - resetting\n");
@@ -582,10 +581,9 @@ static void e1000e_update_rdt_wa(struct e1000_adapter *adapter, unsigned int i)
 
 static void e1000e_update_tdt_wa(struct e1000_adapter *adapter, unsigned int i)
 {
-	u8 __iomem *tail = (adapter->hw.hw_addr + adapter->tx_ring->tail);
 	struct e1000_hw *hw = &adapter->hw;
 
-	if (e1000e_update_tail_wa(hw, tail, i)) {
+	if (e1000e_update_tail_wa(hw, adapter->tx_ring->tail, i)) {
 		u32 tctl = er32(TCTL);
 		ew32(TCTL, tctl & ~E1000_TCTL_EN);
 		e_err("ME firmware caused invalid TDT - resetting\n");
@@ -651,7 +649,7 @@ static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
 			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 				e1000e_update_rdt_wa(adapter, i);
 			else
-				writel(i, adapter->hw.hw_addr + rx_ring->tail);
+				writel(i, rx_ring->tail);
 		}
 		i++;
 		if (i == rx_ring->count)
@@ -754,8 +752,7 @@ static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
 			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 				e1000e_update_rdt_wa(adapter, i << 1);
 			else
-				writel(i << 1,
-				       adapter->hw.hw_addr + rx_ring->tail);
+				writel(i << 1, rx_ring->tail);
 		}
 
 		i++;
@@ -841,7 +838,7 @@ static void e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
 		if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 			e1000e_update_rdt_wa(adapter, i);
 		else
-			writel(i, adapter->hw.hw_addr + rx_ring->tail);
+			writel(i, rx_ring->tail);
 	}
 }
 
@@ -1076,8 +1073,8 @@ static void e1000_print_hw_hang(struct work_struct *work)
 	      "PHY 1000BASE-T Status  <%x>\n"
 	      "PHY Extended Status    <%x>\n"
 	      "PCI Status             <%x>\n",
-	      readl(adapter->hw.hw_addr + tx_ring->head),
-	      readl(adapter->hw.hw_addr + tx_ring->tail),
+	      readl(tx_ring->head),
+	      readl(tx_ring->tail),
 	      tx_ring->next_to_use,
 	      tx_ring->next_to_clean,
 	      tx_ring->buffer_info[eop].time_stamp,
@@ -1617,8 +1614,8 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter)
 	rx_ring->next_to_use = 0;
 	adapter->flags2 &= ~FLAG2_IS_DISCARDING;
 
-	writel(0, adapter->hw.hw_addr + rx_ring->head);
-	writel(0, adapter->hw.hw_addr + rx_ring->tail);
+	writel(0, rx_ring->head);
+	writel(0, rx_ring->tail);
 }
 
 static void e1000e_downshift_workaround(struct work_struct *work)
@@ -1814,7 +1811,7 @@ static irqreturn_t e1000_intr_msix_rx(int irq, void *data)
 	 */
 	if (adapter->rx_ring->set_itr) {
 		writel(1000000000 / (adapter->rx_ring->itr_val * 256),
-		       adapter->hw.hw_addr + adapter->rx_ring->itr_register);
+		       adapter->rx_ring->itr_register);
 		adapter->rx_ring->set_itr = 0;
 	}
 
@@ -1855,19 +1852,19 @@ static void e1000_configure_msix(struct e1000_adapter *adapter)
 	adapter->eiac_mask |= rx_ring->ims_val;
 	if (rx_ring->itr_val)
 		writel(1000000000 / (rx_ring->itr_val * 256),
-		       hw->hw_addr + rx_ring->itr_register);
+		       rx_ring->itr_register);
 	else
-		writel(1, hw->hw_addr + rx_ring->itr_register);
+		writel(1, rx_ring->itr_register);
 	ivar = E1000_IVAR_INT_ALLOC_VALID | vector;
 
 	/* Configure Tx vector */
 	tx_ring->ims_val = E1000_IMS_TXQ0;
 	vector++;
 	if (tx_ring->itr_val)
 		writel(1000000000 / (tx_ring->itr_val * 256),
-		       hw->hw_addr + tx_ring->itr_register);
+		       tx_ring->itr_register);
 	else
-		writel(1, hw->hw_addr + tx_ring->itr_register);
+		writel(1, tx_ring->itr_register);
 	adapter->eiac_mask |= tx_ring->ims_val;
 	ivar |= ((E1000_IVAR_INT_ALLOC_VALID | vector) << 8);
 
@@ -1982,7 +1979,8 @@ static int e1000_request_msix(struct e1000_adapter *adapter)
 			  netdev);
 	if (err)
 		goto out;
-	adapter->rx_ring->itr_register = E1000_EITR_82574(vector);
+	adapter->rx_ring->itr_register = adapter->hw.hw_addr +
+	    E1000_EITR_82574(vector);
 	adapter->rx_ring->itr_val = adapter->itr;
 	vector++;
 
@@ -1997,7 +1995,8 @@ static int e1000_request_msix(struct e1000_adapter *adapter)
 			  netdev);
 	if (err)
 		goto out;
-	adapter->tx_ring->itr_register = E1000_EITR_82574(vector);
+	adapter->tx_ring->itr_register = adapter->hw.hw_addr +
+	    E1000_EITR_82574(vector);
 	adapter->tx_ring->itr_val = adapter->itr;
 	vector++;
 
@@ -2288,8 +2287,8 @@ static void e1000_clean_tx_ring(struct e1000_adapter *adapter)
 	tx_ring->next_to_use = 0;
 	tx_ring->next_to_clean = 0;
 
-	writel(0, adapter->hw.hw_addr + tx_ring->head);
-	writel(0, adapter->hw.hw_addr + tx_ring->tail);
+	writel(0, tx_ring->head);
+	writel(0, tx_ring->tail);
 }
 
 /**
@@ -2773,8 +2772,8 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
 	ew32(TDLEN, tdlen);
 	ew32(TDH, 0);
 	ew32(TDT, 0);
-	tx_ring->head = E1000_TDH;
-	tx_ring->tail = E1000_TDT;
+	tx_ring->head = adapter->hw.hw_addr + E1000_TDH;
+	tx_ring->tail = adapter->hw.hw_addr + E1000_TDT;
 
 	/* Set the default values for the Tx Inter Packet Gap timer */
 	tipg = DEFAULT_82543_TIPG_IPGT_COPPER;          /*  8  */
@@ -3088,8 +3087,8 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
 	ew32(RDLEN, rdlen);
 	ew32(RDH, 0);
 	ew32(RDT, 0);
-	rx_ring->head = E1000_RDH;
-	rx_ring->tail = E1000_RDT;
+	rx_ring->head = adapter->hw.hw_addr + E1000_RDH;
+	rx_ring->tail = adapter->hw.hw_addr + E1000_RDT;
 
 	/* Enable Receive Checksum Offload for TCP and UDP */
 	rxcsum = er32(RXCSUM);
@@ -4914,7 +4913,7 @@ static void e1000_tx_queue(struct e1000_adapter *adapter,
 	if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 		e1000e_update_tdt_wa(adapter, i);
 	else
-		writel(i, adapter->hw.hw_addr + tx_ring->tail);
+		writel(i, tx_ring->tail);
 
 	/*
 	 * we need this if more than one processor can write to our tail