[PATCH net-next-2.6 1/2] 3c59x: Specify window explicitly for access to windowed registers

[Ben Hutchings <ben@decadent.org.uk>]

Currently much of the code assumes that a specific window has been
selected, while a few functions save and restore the window.  This
makes it impossible to introduce fine-grained locking.

Make those assumptions explicit by introducing wrapper functions
to set the window and read/write a register.  Use these everywhere
except vortex_interrupt(), vortex_start_xmit() and vortex_rx().
These set the window just once, or not at all in the case of
vortex_rx() as it should always be called from vortex_interrupt().

Cache the current window in struct vortex_private to avoid
unnecessary hardware writes.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Tested-by: Arne Nordmark <nordmark@mech.kth.se> [against 2.6.32]
---
 drivers/net/3c59x.c |  288 +++++++++++++++++++++++++--------------------------
 1 files changed, 140 insertions(+), 148 deletions(-)

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index d75803e..beddef9 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -435,7 +435,6 @@ MODULE_DEVICE_TABLE(pci, vortex_pci_tbl);
    First the windows.  There are eight register windows, with the command
    and status registers available in each.
    */
-#define EL3WINDOW(win_num) iowrite16(SelectWindow + (win_num), ioaddr + EL3_CMD)
 #define EL3_CMD 0x0e
 #define EL3_STATUS 0x0e
 
@@ -647,8 +646,35 @@ struct vortex_private {
 	u16 io_size;						/* Size of PCI region (for release_region) */
 	spinlock_t lock;					/* Serialise access to device & its vortex_private */
 	struct mii_if_info mii;				/* MII lib hooks/info */
+	int window;					/* Register window */
 };
 
+static void window_set(struct vortex_private *vp, int window)
+{
+	if (window != vp->window) {
+		iowrite16(SelectWindow + window, vp->ioaddr + EL3_CMD);
+		vp->window = window;
+	}
+}
+
+#define DEFINE_WINDOW_IO(size)						\
+static u ## size							\
+window_read ## size(struct vortex_private *vp, int window, int addr)	\
+{									\
+	window_set(vp, window);						\
+	return ioread ## size(vp->ioaddr + addr);			\
+}									\
+static void								\
+window_write ## size(struct vortex_private *vp, u ## size value,	\
+		     int window, int addr)				\
+{									\
+	window_set(vp, window);						\
+	iowrite ## size(value, vp->ioaddr + addr);			\
+}
+DEFINE_WINDOW_IO(8)
+DEFINE_WINDOW_IO(16)
+DEFINE_WINDOW_IO(32)
+
 #ifdef CONFIG_PCI
 #define DEVICE_PCI(dev) (((dev)->bus == &pci_bus_type) ? to_pci_dev((dev)) : NULL)
 #else
@@ -711,7 +737,7 @@ static int vortex_probe1(struct device *gendev, void __iomem *ioaddr, int irq,
 static int vortex_up(struct net_device *dev);
 static void vortex_down(struct net_device *dev, int final);
 static int vortex_open(struct net_device *dev);
-static void mdio_sync(void __iomem *ioaddr, int bits);
+static void mdio_sync(struct vortex_private *vp, int bits);
 static int mdio_read(struct net_device *dev, int phy_id, int location);
 static void mdio_write(struct net_device *vp, int phy_id, int location, int value);
 static void vortex_timer(unsigned long arg);
@@ -1119,6 +1145,7 @@ static int __devinit vortex_probe1(struct device *gendev,
 	vp->has_nway = (vci->drv_flags & HAS_NWAY) ? 1 : 0;
 	vp->io_size = vci->io_size;
 	vp->card_idx = card_idx;
+	vp->window = -1;
 
 	/* module list only for Compaq device */
 	if (gendev == NULL) {
@@ -1205,7 +1232,6 @@ static int __devinit vortex_probe1(struct device *gendev,
 	vp->mii.force_media = vp->full_duplex;
 	vp->options = option;
 	/* Read the station address from the EEPROM. */
-	EL3WINDOW(0);
 	{
 		int base;
 
@@ -1218,14 +1244,15 @@ static int __devinit vortex_probe1(struct device *gendev,
 
 		for (i = 0; i < 0x40; i++) {
 			int timer;
-			iowrite16(base + i, ioaddr + Wn0EepromCmd);
+			window_write16(vp, base + i, 0, Wn0EepromCmd);
 			/* Pause for at least 162 us. for the read to take place. */
 			for (timer = 10; timer >= 0; timer--) {
 				udelay(162);
-				if ((ioread16(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
+				if ((window_read16(vp, 0, Wn0EepromCmd) &
+				     0x8000) == 0)
 					break;
 			}
-			eeprom[i] = ioread16(ioaddr + Wn0EepromData);
+			eeprom[i] = window_read16(vp, 0, Wn0EepromData);
 		}
 	}
 	for (i = 0; i < 0x18; i++)
@@ -1250,9 +1277,8 @@ static int __devinit vortex_probe1(struct device *gendev,
 		pr_err("*** EEPROM MAC address is invalid.\n");
 		goto free_ring;	/* With every pack */
 	}
-	EL3WINDOW(2);
 	for (i = 0; i < 6; i++)
-		iowrite8(dev->dev_addr[i], ioaddr + i);
+		window_write8(vp, dev->dev_addr[i], 2, i);
 
 	if (print_info)
 		pr_cont(", IRQ %d\n", dev->irq);
@@ -1261,8 +1287,7 @@ static int __devinit vortex_probe1(struct device *gendev,
 		pr_warning(" *** Warning: IRQ %d is unlikely to work! ***\n",
 			   dev->irq);
 
-	EL3WINDOW(4);
-	step = (ioread8(ioaddr + Wn4_NetDiag) & 0x1e) >> 1;
+	step = (window_read8(vp, 4, Wn4_NetDiag) & 0x1e) >> 1;
 	if (print_info) {
 		pr_info("  product code %02x%02x rev %02x.%d date %02d-%02d-%02d\n",
 			eeprom[6]&0xff, eeprom[6]>>8, eeprom[0x14],
@@ -1285,17 +1310,15 @@ static int __devinit vortex_probe1(struct device *gendev,
 				(unsigned long long)pci_resource_start(pdev, 2),
 				vp->cb_fn_base);
 		}
-		EL3WINDOW(2);
 
-		n = ioread16(ioaddr + Wn2_ResetOptions) & ~0x4010;
+		n = window_read16(vp, 2, Wn2_ResetOptions) & ~0x4010;
 		if (vp->drv_flags & INVERT_LED_PWR)
 			n |= 0x10;
 		if (vp->drv_flags & INVERT_MII_PWR)
 			n |= 0x4000;
-		iowrite16(n, ioaddr + Wn2_ResetOptions);
+		window_write16(vp, n, 2, Wn2_ResetOptions);
 		if (vp->drv_flags & WNO_XCVR_PWR) {
-			EL3WINDOW(0);
-			iowrite16(0x0800, ioaddr);
+			window_write16(vp, 0x0800, 0, 0);
 		}
 	}
 
@@ -1313,14 +1336,13 @@ static int __devinit vortex_probe1(struct device *gendev,
 	{
 		static const char * const ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
 		unsigned int config;
-		EL3WINDOW(3);
-		vp->available_media = ioread16(ioaddr + Wn3_Options);
+		vp->available_media = window_read16(vp, 3, Wn3_Options);
 		if ((vp->available_media & 0xff) == 0)		/* Broken 3c916 */
 			vp->available_media = 0x40;
-		config = ioread32(ioaddr + Wn3_Config);
+		config = window_read32(vp, 3, Wn3_Config);
 		if (print_info) {
 			pr_debug("  Internal config register is %4.4x, transceivers %#x.\n",
-				config, ioread16(ioaddr + Wn3_Options));
+				config, window_read16(vp, 3, Wn3_Options));
 			pr_info("  %dK %s-wide RAM %s Rx:Tx split, %s%s interface.\n",
 				   8 << RAM_SIZE(config),
 				   RAM_WIDTH(config) ? "word" : "byte",
@@ -1346,7 +1368,6 @@ static int __devinit vortex_probe1(struct device *gendev,
 	if ((vp->available_media & 0x40) || (vci->drv_flags & HAS_NWAY) ||
 		dev->if_port == XCVR_MII || dev->if_port == XCVR_NWAY) {
 		int phy, phy_idx = 0;
-		EL3WINDOW(4);
 		mii_preamble_required++;
 		if (vp->drv_flags & EXTRA_PREAMBLE)
 			mii_preamble_required++;
@@ -1478,18 +1499,17 @@ static void
 vortex_set_duplex(struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 
 	pr_info("%s:  setting %s-duplex.\n",
 		dev->name, (vp->full_duplex) ? "full" : "half");
 
-	EL3WINDOW(3);
 	/* Set the full-duplex bit. */
-	iowrite16(((vp->info1 & 0x8000) || vp->full_duplex ? 0x20 : 0) |
-		 	(vp->large_frames ? 0x40 : 0) |
-			((vp->full_duplex && vp->flow_ctrl && vp->partner_flow_ctrl) ?
-					0x100 : 0),
-			ioaddr + Wn3_MAC_Ctrl);
+	window_write16(vp,
+		       ((vp->info1 & 0x8000) || vp->full_duplex ? 0x20 : 0) |
+		       (vp->large_frames ? 0x40 : 0) |
+		       ((vp->full_duplex && vp->flow_ctrl && vp->partner_flow_ctrl) ?
+			0x100 : 0),
+		       3, Wn3_MAC_Ctrl);
 }
 
 static void vortex_check_media(struct net_device *dev, unsigned int init)
@@ -1529,8 +1549,7 @@ vortex_up(struct net_device *dev)
 	}
 
 	/* Before initializing select the active media port. */
-	EL3WINDOW(3);
-	config = ioread32(ioaddr + Wn3_Config);
+	config = window_read32(vp, 3, Wn3_Config);
 
 	if (vp->media_override != 7) {
 		pr_info("%s: Media override to transceiver %d (%s).\n",
@@ -1577,10 +1596,9 @@ vortex_up(struct net_device *dev)
 	config = BFINS(config, dev->if_port, 20, 4);
 	if (vortex_debug > 6)
 		pr_debug("vortex_up(): writing 0x%x to InternalConfig\n", config);
-	iowrite32(config, ioaddr + Wn3_Config);
+	window_write32(vp, config, 3, Wn3_Config);
 
 	if (dev->if_port == XCVR_MII || dev->if_port == XCVR_NWAY) {
-		EL3WINDOW(4);
 		mii_reg1 = mdio_read(dev, vp->phys[0], MII_BMSR);
 		mii_reg5 = mdio_read(dev, vp->phys[0], MII_LPA);
 		vp->partner_flow_ctrl = ((mii_reg5 & 0x0400) != 0);
@@ -1601,51 +1619,46 @@ vortex_up(struct net_device *dev)
 	iowrite16(SetStatusEnb | 0x00, ioaddr + EL3_CMD);
 
 	if (vortex_debug > 1) {
-		EL3WINDOW(4);
 		pr_debug("%s: vortex_up() irq %d media status %4.4x.\n",
-			   dev->name, dev->irq, ioread16(ioaddr + Wn4_Media));
+			   dev->name, dev->irq, window_read16(vp, 4, Wn4_Media));
 	}
 
 	/* Set the station address and mask in window 2 each time opened. */
-	EL3WINDOW(2);
 	for (i = 0; i < 6; i++)
-		iowrite8(dev->dev_addr[i], ioaddr + i);
+		window_write8(vp, dev->dev_addr[i], 2, i);
 	for (; i < 12; i+=2)
-		iowrite16(0, ioaddr + i);
+		window_write16(vp, 0, 2, i);
 
 	if (vp->cb_fn_base) {
-		unsigned short n = ioread16(ioaddr + Wn2_ResetOptions) & ~0x4010;
+		unsigned short n = window_read16(vp, 2, Wn2_ResetOptions) & ~0x4010;
 		if (vp->drv_flags & INVERT_LED_PWR)
 			n |= 0x10;
 		if (vp->drv_flags & INVERT_MII_PWR)
 			n |= 0x4000;
-		iowrite16(n, ioaddr + Wn2_ResetOptions);
+		window_write16(vp, n, 2, Wn2_ResetOptions);
 	}
 
 	if (dev->if_port == XCVR_10base2)
 		/* Start the thinnet transceiver. We should really wait 50ms...*/
 		iowrite16(StartCoax, ioaddr + EL3_CMD);
 	if (dev->if_port != XCVR_NWAY) {
-		EL3WINDOW(4);
-		iowrite16((ioread16(ioaddr + Wn4_Media) & ~(Media_10TP|Media_SQE)) |
-			 media_tbl[dev->if_port].media_bits, ioaddr + Wn4_Media);
+		window_write16(vp,
+			       (window_read16(vp, 4, Wn4_Media) &
+				~(Media_10TP|Media_SQE)) |
+			       media_tbl[dev->if_port].media_bits,
+			       4, Wn4_Media);
 	}
 
 	/* Switch to the stats window, and clear all stats by reading. */
 	iowrite16(StatsDisable, ioaddr + EL3_CMD);
-	EL3WINDOW(6);
 	for (i = 0; i < 10; i++)
-		ioread8(ioaddr + i);
-	ioread16(ioaddr + 10);
-	ioread16(ioaddr + 12);
+		window_read8(vp, 6, i);
+	window_read16(vp, 6, 10);
+	window_read16(vp, 6, 12);
 	/* New: On the Vortex we must also clear the BadSSD counter. */
-	EL3WINDOW(4);
-	ioread8(ioaddr + 12);
+	window_read8(vp, 4, 12);
 	/* ..and on the Boomerang we enable the extra statistics bits. */
-	iowrite16(0x0040, ioaddr + Wn4_NetDiag);
-
-	/* Switch to register set 7 for normal use. */
-	EL3WINDOW(7);
+	window_write16(vp, 0x0040, 4, Wn4_NetDiag);
 
 	if (vp->full_bus_master_rx) { /* Boomerang bus master. */
 		vp->cur_rx = vp->dirty_rx = 0;
@@ -1763,7 +1776,7 @@ vortex_timer(unsigned long data)
 	void __iomem *ioaddr = vp->ioaddr;
 	int next_tick = 60*HZ;
 	int ok = 0;
-	int media_status, old_window;
+	int media_status;
 
 	if (vortex_debug > 2) {
 		pr_debug("%s: Media selection timer tick happened, %s.\n",
@@ -1772,9 +1785,7 @@ vortex_timer(unsigned long data)
 	}
 
 	disable_irq_lockdep(dev->irq);
-	old_window = ioread16(ioaddr + EL3_CMD) >> 13;
-	EL3WINDOW(4);
-	media_status = ioread16(ioaddr + Wn4_Media);
+	media_status = window_read16(vp, 4, Wn4_Media);
 	switch (dev->if_port) {
 	case XCVR_10baseT:  case XCVR_100baseTx:  case XCVR_100baseFx:
 		if (media_status & Media_LnkBeat) {
@@ -1830,13 +1841,14 @@ vortex_timer(unsigned long data)
 					   dev->name, media_tbl[dev->if_port].name);
 			next_tick = media_tbl[dev->if_port].wait;
 		}
-		iowrite16((media_status & ~(Media_10TP|Media_SQE)) |
-			 media_tbl[dev->if_port].media_bits, ioaddr + Wn4_Media);
+		window_write16(vp,
+			       (media_status & ~(Media_10TP|Media_SQE)) |
+			       media_tbl[dev->if_port].media_bits,
+			       4, Wn4_Media);
 
-		EL3WINDOW(3);
-		config = ioread32(ioaddr + Wn3_Config);
+		config = window_read32(vp, 3, Wn3_Config);
 		config = BFINS(config, dev->if_port, 20, 4);
-		iowrite32(config, ioaddr + Wn3_Config);
+		window_write32(vp, config, 3, Wn3_Config);
 
 		iowrite16(dev->if_port == XCVR_10base2 ? StartCoax : StopCoax,
 			 ioaddr + EL3_CMD);
@@ -1850,7 +1862,6 @@ leave_media_alone:
 	  pr_debug("%s: Media selection timer finished, %s.\n",
 			 dev->name, media_tbl[dev->if_port].name);
 
-	EL3WINDOW(old_window);
 	enable_irq_lockdep(dev->irq);
 	mod_timer(&vp->timer, RUN_AT(next_tick));
 	if (vp->deferred)
@@ -1865,12 +1876,11 @@ static void vortex_tx_timeout(struct net_device *dev)
 	pr_err("%s: transmit timed out, tx_status %2.2x status %4.4x.\n",
 		   dev->name, ioread8(ioaddr + TxStatus),
 		   ioread16(ioaddr + EL3_STATUS));
-	EL3WINDOW(4);
 	pr_err("  diagnostics: net %04x media %04x dma %08x fifo %04x\n",
-			ioread16(ioaddr + Wn4_NetDiag),
-			ioread16(ioaddr + Wn4_Media),
+			window_read16(vp, 4, Wn4_NetDiag),
+			window_read16(vp, 4, Wn4_Media),
 			ioread32(ioaddr + PktStatus),
-			ioread16(ioaddr + Wn4_FIFODiag));
+			window_read16(vp, 4, Wn4_FIFODiag));
 	/* Slight code bloat to be user friendly. */
 	if ((ioread8(ioaddr + TxStatus) & 0x88) == 0x88)
 		pr_err("%s: Transmitter encountered 16 collisions --"
@@ -1917,9 +1927,6 @@ static void vortex_tx_timeout(struct net_device *dev)
 	/* Issue Tx Enable */
 	iowrite16(TxEnable, ioaddr + EL3_CMD);
 	dev->trans_start = jiffies; /* prevent tx timeout */
-
-	/* Switch to register set 7 for normal use. */
-	EL3WINDOW(7);
 }
 
 /*
@@ -1980,10 +1987,10 @@ vortex_error(struct net_device *dev, int status)
 			ioread16(ioaddr + EL3_STATUS) & StatsFull) {
 			pr_warning("%s: Updating statistics failed, disabling "
 				   "stats as an interrupt source.\n", dev->name);
-			EL3WINDOW(5);
-			iowrite16(SetIntrEnb | (ioread16(ioaddr + 10) & ~StatsFull), ioaddr + EL3_CMD);
+			iowrite16(SetIntrEnb |
+				  (window_read16(vp, 5, 10) & ~StatsFull),
+				  ioaddr + EL3_CMD);
 			vp->intr_enable &= ~StatsFull;
-			EL3WINDOW(7);
 			DoneDidThat++;
 		}
 	}
@@ -1993,8 +2000,7 @@ vortex_error(struct net_device *dev, int status)
 	}
 	if (status & HostError) {
 		u16 fifo_diag;
-		EL3WINDOW(4);
-		fifo_diag = ioread16(ioaddr + Wn4_FIFODiag);
+		fifo_diag = window_read16(vp, 4, Wn4_FIFODiag);
 		pr_err("%s: Host error, FIFO diagnostic register %4.4x.\n",
 			   dev->name, fifo_diag);
 		/* Adapter failure requires Tx/Rx reset and reinit. */
@@ -2043,8 +2049,10 @@ vortex_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (vp->bus_master) {
 		/* Set the bus-master controller to transfer the packet. */
 		int len = (skb->len + 3) & ~3;
-		iowrite32(vp->tx_skb_dma = pci_map_single(VORTEX_PCI(vp), skb->data, len, PCI_DMA_TODEVICE),
-				ioaddr + Wn7_MasterAddr);
+		vp->tx_skb_dma = pci_map_single(VORTEX_PCI(vp), skb->data, len,
+						PCI_DMA_TODEVICE);
+		window_set(vp, 7);
+		iowrite32(vp->tx_skb_dma, ioaddr + Wn7_MasterAddr);
 		iowrite16(len, ioaddr + Wn7_MasterLen);
 		vp->tx_skb = skb;
 		iowrite16(StartDMADown, ioaddr + EL3_CMD);
@@ -2217,6 +2225,8 @@ vortex_interrupt(int irq, void *dev_id)
 		pr_debug("%s: interrupt, status %4.4x, latency %d ticks.\n",
 			   dev->name, status, ioread8(ioaddr + Timer));
 
+	window_set(vp, 7);
+
 	do {
 		if (vortex_debug > 5)
 				pr_debug("%s: In interrupt loop, status %4.4x.\n",
@@ -2760,54 +2770,46 @@ static struct net_device_stats *vortex_get_stats(struct net_device *dev)
 static void update_stats(void __iomem *ioaddr, struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	int old_window = ioread16(ioaddr + EL3_CMD);
 
-	if (old_window == 0xffff)	/* Chip suspended or ejected. */
-		return;
 	/* Unlike the 3c5x9 we need not turn off stats updates while reading. */
 	/* Switch to the stats window, and read everything. */
-	EL3WINDOW(6);
-	dev->stats.tx_carrier_errors		+= ioread8(ioaddr + 0);
-	dev->stats.tx_heartbeat_errors		+= ioread8(ioaddr + 1);
-	dev->stats.tx_window_errors		+= ioread8(ioaddr + 4);
-	dev->stats.rx_fifo_errors		+= ioread8(ioaddr + 5);
-	dev->stats.tx_packets			+= ioread8(ioaddr + 6);
-	dev->stats.tx_packets			+= (ioread8(ioaddr + 9)&0x30) << 4;
-	/* Rx packets	*/			ioread8(ioaddr + 7);   /* Must read to clear */
+	dev->stats.tx_carrier_errors		+= window_read8(vp, 6, 0);
+	dev->stats.tx_heartbeat_errors		+= window_read8(vp, 6, 1);
+	dev->stats.tx_window_errors		+= window_read8(vp, 6, 4);
+	dev->stats.rx_fifo_errors		+= window_read8(vp, 6, 5);
+	dev->stats.tx_packets			+= window_read8(vp, 6, 6);
+	dev->stats.tx_packets			+= (window_read8(vp, 6, 9) &
+						    0x30) << 4;
+	/* Rx packets	*/			window_read8(vp, 6, 7);   /* Must read to clear */
 	/* Don't bother with register 9, an extension of registers 6&7.
 	   If we do use the 6&7 values the atomic update assumption above
 	   is invalid. */
-	dev->stats.rx_bytes 			+= ioread16(ioaddr + 10);
-	dev->stats.tx_bytes 			+= ioread16(ioaddr + 12);
+	dev->stats.rx_bytes 			+= window_read16(vp, 6, 10);
+	dev->stats.tx_bytes 			+= window_read16(vp, 6, 12);
 	/* Extra stats for get_ethtool_stats() */
-	vp->xstats.tx_multiple_collisions	+= ioread8(ioaddr + 2);
-	vp->xstats.tx_single_collisions         += ioread8(ioaddr + 3);
-	vp->xstats.tx_deferred			+= ioread8(ioaddr + 8);
-	EL3WINDOW(4);
-	vp->xstats.rx_bad_ssd			+= ioread8(ioaddr + 12);
+	vp->xstats.tx_multiple_collisions	+= window_read8(vp, 6, 2);
+	vp->xstats.tx_single_collisions         += window_read8(vp, 6, 3);
+	vp->xstats.tx_deferred			+= window_read8(vp, 6, 8);
+	vp->xstats.rx_bad_ssd			+= window_read8(vp, 4, 12);
 
 	dev->stats.collisions = vp->xstats.tx_multiple_collisions
 		+ vp->xstats.tx_single_collisions
 		+ vp->xstats.tx_max_collisions;
 
 	{
-		u8 up = ioread8(ioaddr + 13);
+		u8 up = window_read8(vp, 4, 13);
 		dev->stats.rx_bytes += (up & 0x0f) << 16;
 		dev->stats.tx_bytes += (up & 0xf0) << 12;
 	}
-
-	EL3WINDOW(old_window >> 13);
 }
 
 static int vortex_nway_reset(struct net_device *dev)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	unsigned long flags;
 	int rc;
 
 	spin_lock_irqsave(&vp->lock, flags);
-	EL3WINDOW(4);
 	rc = mii_nway_restart(&vp->mii);
 	spin_unlock_irqrestore(&vp->lock, flags);
 	return rc;
@@ -2816,12 +2818,10 @@ static int vortex_nway_reset(struct net_device *dev)
 static int vortex_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	unsigned long flags;
 	int rc;
 
 	spin_lock_irqsave(&vp->lock, flags);
-	EL3WINDOW(4);
 	rc = mii_ethtool_gset(&vp->mii, cmd);
 	spin_unlock_irqrestore(&vp->lock, flags);
 	return rc;
@@ -2830,12 +2830,10 @@ static int vortex_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 static int vortex_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	unsigned long flags;
 	int rc;
 
 	spin_lock_irqsave(&vp->lock, flags);
-	EL3WINDOW(4);
 	rc = mii_ethtool_sset(&vp->mii, cmd);
 	spin_unlock_irqrestore(&vp->lock, flags);
 	return rc;
@@ -2930,7 +2928,6 @@ static int vortex_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 {
 	int err;
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	unsigned long flags;
 	pci_power_t state = 0;
 
@@ -2942,7 +2939,6 @@ static int vortex_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 	if(state != 0)
 		pci_set_power_state(VORTEX_PCI(vp), PCI_D0);
 	spin_lock_irqsave(&vp->lock, flags);
-	EL3WINDOW(4);
 	err = generic_mii_ioctl(&vp->mii, if_mii(rq), cmd, NULL);
 	spin_unlock_irqrestore(&vp->lock, flags);
 	if(state != 0)
@@ -2985,8 +2981,6 @@ static void set_rx_mode(struct net_device *dev)
 static void set_8021q_mode(struct net_device *dev, int enable)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
-	int old_window = ioread16(ioaddr + EL3_CMD);
 	int mac_ctrl;
 
 	if ((vp->drv_flags&IS_CYCLONE) || (vp->drv_flags&IS_TORNADO)) {
@@ -2997,28 +2991,23 @@ static void set_8021q_mode(struct net_device *dev, int enable)
 		if (enable)
 			max_pkt_size += 4;	/* 802.1Q VLAN tag */
 
-		EL3WINDOW(3);
-		iowrite16(max_pkt_size, ioaddr+Wn3_MaxPktSize);
+		window_write16(vp, max_pkt_size, 3, Wn3_MaxPktSize);
 
 		/* set VlanEtherType to let the hardware checksumming
 		   treat tagged frames correctly */
-		EL3WINDOW(7);
-		iowrite16(VLAN_ETHER_TYPE, ioaddr+Wn7_VlanEtherType);
+		window_write16(vp, VLAN_ETHER_TYPE, 7, Wn7_VlanEtherType);
 	} else {
 		/* on older cards we have to enable large frames */
 
 		vp->large_frames = dev->mtu > 1500 || enable;
 
-		EL3WINDOW(3);
-		mac_ctrl = ioread16(ioaddr+Wn3_MAC_Ctrl);
+		mac_ctrl = window_read16(vp, 3, Wn3_MAC_Ctrl);
 		if (vp->large_frames)
 			mac_ctrl |= 0x40;
 		else
 			mac_ctrl &= ~0x40;
-		iowrite16(mac_ctrl, ioaddr+Wn3_MAC_Ctrl);
+		window_write16(vp, mac_ctrl, 3, Wn3_MAC_Ctrl);
 	}
-
-	EL3WINDOW(old_window);
 }
 #else
 
@@ -3037,7 +3026,10 @@ static void set_8021q_mode(struct net_device *dev, int enable)
 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
    "overclocking" issues. */
-#define mdio_delay() ioread32(mdio_addr)
+static void mdio_delay(struct vortex_private *vp)
+{
+	window_read32(vp, 4, Wn4_PhysicalMgmt);
+}
 
 #define MDIO_SHIFT_CLK	0x01
 #define MDIO_DIR_WRITE	0x04
@@ -3048,16 +3040,15 @@ static void set_8021q_mode(struct net_device *dev, int enable)
 
 /* Generate the preamble required for initial synchronization and
    a few older transceivers. */
-static void mdio_sync(void __iomem *ioaddr, int bits)
+static void mdio_sync(struct vortex_private *vp, int bits)
 {
-	void __iomem *mdio_addr = ioaddr + Wn4_PhysicalMgmt;
-
 	/* Establish sync by sending at least 32 logic ones. */
 	while (-- bits >= 0) {
-		iowrite16(MDIO_DATA_WRITE1, mdio_addr);
-		mdio_delay();
-		iowrite16(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
-		mdio_delay();
+		window_write16(vp, MDIO_DATA_WRITE1, 4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
+		window_write16(vp, MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK,
+			       4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
 	}
 }
 
@@ -3065,29 +3056,31 @@ static int mdio_read(struct net_device *dev, int phy_id, int location)
 {
 	int i;
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	int read_cmd = (0xf6 << 10) | (phy_id << 5) | location;
 	unsigned int retval = 0;
-	void __iomem *mdio_addr = ioaddr + Wn4_PhysicalMgmt;
 
 	if (mii_preamble_required)
-		mdio_sync(ioaddr, 32);
+		mdio_sync(vp, 32);
 
 	/* Shift the read command bits out. */
 	for (i = 14; i >= 0; i--) {
 		int dataval = (read_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
-		iowrite16(dataval, mdio_addr);
-		mdio_delay();
-		iowrite16(dataval | MDIO_SHIFT_CLK, mdio_addr);
-		mdio_delay();
+		window_write16(vp, dataval, 4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
+		window_write16(vp, dataval | MDIO_SHIFT_CLK,
+			       4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
 	}
 	/* Read the two transition, 16 data, and wire-idle bits. */
 	for (i = 19; i > 0; i--) {
-		iowrite16(MDIO_ENB_IN, mdio_addr);
-		mdio_delay();
-		retval = (retval << 1) | ((ioread16(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
-		iowrite16(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
-		mdio_delay();
+		window_write16(vp, MDIO_ENB_IN, 4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
+		retval = (retval << 1) |
+			((window_read16(vp, 4, Wn4_PhysicalMgmt) &
+			  MDIO_DATA_READ) ? 1 : 0);
+		window_write16(vp, MDIO_ENB_IN | MDIO_SHIFT_CLK,
+			       4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
 	}
 	return retval & 0x20000 ? 0xffff : retval>>1 & 0xffff;
 }
@@ -3095,28 +3088,28 @@ static int mdio_read(struct net_device *dev, int phy_id, int location)
 static void mdio_write(struct net_device *dev, int phy_id, int location, int value)
 {
 	struct vortex_private *vp = netdev_priv(dev);
-	void __iomem *ioaddr = vp->ioaddr;
 	int write_cmd = 0x50020000 | (phy_id << 23) | (location << 18) | value;
-	void __iomem *mdio_addr = ioaddr + Wn4_PhysicalMgmt;
 	int i;
 
 	if (mii_preamble_required)
-		mdio_sync(ioaddr, 32);
+		mdio_sync(vp, 32);
 
 	/* Shift the command bits out. */
 	for (i = 31; i >= 0; i--) {
 		int dataval = (write_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
-		iowrite16(dataval, mdio_addr);
-		mdio_delay();
-		iowrite16(dataval | MDIO_SHIFT_CLK, mdio_addr);
-		mdio_delay();
+		window_write16(vp, dataval, 4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
+		window_write16(vp, dataval | MDIO_SHIFT_CLK,
+			       4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
 	}
 	/* Leave the interface idle. */
 	for (i = 1; i >= 0; i--) {
-		iowrite16(MDIO_ENB_IN, mdio_addr);
-		mdio_delay();
-		iowrite16(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
-		mdio_delay();
+		window_write16(vp, MDIO_ENB_IN, 4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
+		window_write16(vp, MDIO_ENB_IN | MDIO_SHIFT_CLK,
+			       4, Wn4_PhysicalMgmt);
+		mdio_delay(vp);
 	}
 }
 
@@ -3131,8 +3124,7 @@ static void acpi_set_WOL(struct net_device *dev)
 
 	if (vp->enable_wol) {
 		/* Power up on: 1==Downloaded Filter, 2==Magic Packets, 4==Link Status. */
-		EL3WINDOW(7);
-		iowrite16(2, ioaddr + 0x0c);
+		window_write16(vp, 2, 7, 0x0c);
 		/* The RxFilter must accept the WOL frames. */
 		iowrite16(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
 		iowrite16(RxEnable, ioaddr + EL3_CMD);
-- 
1.7.1