[patch 2.6.13 2/2] 3c59x: add option for using memory-mapped PCI I/O resources

["John W. Linville" <linville@tuxdriver.com>]

Add module option to enable 3c59x driver to use memory-mapped PCI I/O
resources.  This may improve performance for those devices so equipped.

Add "use_mmio=1" to the 3c59x module options in order to enable this
functionality.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
Ideally this option will eventually go away.  First we need a good list
of which devices "work" and which ones do not.

 drivers/net/3c59x.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -918,6 +918,9 @@ static int global_enable_wol = -1;
 static int compaq_ioaddr, compaq_irq, compaq_device_id = 0x5900;
 static struct net_device *compaq_net_device;
 
+/* Flag to enable use of memory-mapped PCI I/O resource */
+static int use_mmio;
+
 static int vortex_cards_found;
 
 module_param(debug, int, 0);
@@ -935,6 +938,7 @@ module_param(compaq_ioaddr, int, 0);
 module_param(compaq_irq, int, 0);
 module_param(compaq_device_id, int, 0);
 module_param(watchdog, int, 0);
+module_param(use_mmio, int, 0);
 MODULE_PARM_DESC(debug, "3c59x debug level (0-6)");
 MODULE_PARM_DESC(options, "3c59x: Bits 0-3: media type, bit 4: bus mastering, bit 9: full duplex");
 MODULE_PARM_DESC(global_options, "3c59x: same as options, but applies to all NICs if options is unset");
@@ -950,6 +954,7 @@ MODULE_PARM_DESC(compaq_ioaddr, "3c59x P
 MODULE_PARM_DESC(compaq_irq, "3c59x PCI IRQ number (Compaq BIOS problem workaround)");
 MODULE_PARM_DESC(compaq_device_id, "3c59x PCI device ID (Compaq BIOS problem workaround)");
 MODULE_PARM_DESC(watchdog, "3c59x transmit timeout in milliseconds");
+MODULE_PARM_DESC(use_mmio, "3c59x: use memory-mapped PCI I/O resource");
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void poll_vortex(struct net_device *dev)
@@ -1093,14 +1098,16 @@ static int __init vortex_eisa_init (void
 static int __devinit vortex_init_one (struct pci_dev *pdev,
 				      const struct pci_device_id *ent)
 {
-	int rc;
+	int rc, pci_bar;
 
 	/* wake up and enable device */		
 	rc = pci_enable_device (pdev);
 	if (rc < 0)
 		goto out;
 
-	rc = vortex_probe1 (&pdev->dev, pci_iomap(pdev, 0, 0),
+	pci_bar = use_mmio ? 1 : 0;
+
+	rc = vortex_probe1 (&pdev->dev, pci_iomap(pdev, pci_bar, 0),
 			    pdev->irq, ent->driver_data, vortex_cards_found);
 	if (rc < 0) {
 		pci_disable_device (pdev);
-- 
John W. Linville
linville@tuxdriver.com