[pci] Add definitions for PCI Express function level reset (FLR)

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/tg3/tg3.h

 #define PCI_X_CMD			2       /* Modes & Features */
 #define PCI_X_CMD_ERO			0x0002  /* Enable Relaxed Ordering */
 
-#define PCI_EXP_DEVCTL			8       /* Device Control */
 #define PCI_EXP_DEVCTL_RELAX_EN		0x0010 /* Enable relaxed ordering */
 #define PCI_EXP_DEVCTL_NOSNOOP_EN	0x0800  /* Enable No Snoop */
 #define PCI_EXP_DEVCTL_PAYLOAD		0x00e0  /* Max_Payload_Size */

src/include/ipxe/pci.h

 #define PCI_PM_CTRL_PME_ENABLE		0x0100	/**< PME pin enable */
 #define PCI_PM_CTRL_PME_STATUS		0x8000	/**< PME pin status */
 
+/** PCI Express */
+#define PCI_EXP_DEVCTL		0x08
+#define PCI_EXP_DEVCTL_FLR		0x8000	/**< Function level reset */
+
 /** Uncorrectable error status */
 #define PCI_ERR_UNCOR_STATUS	0x04
 
 	( ( ( (base) & 0xff ) << 16 ) |	( ( (sub) & 0xff ) << 8 ) |	\
 	  ( ( (progif) & 0xff) << 0 ) )
 
+/** PCI Express function level reset delay (in ms) */
+#define PCI_EXP_FLR_DELAY_MS 100
+
 /** A PCI device ID list entry */
 struct pci_device_id {
 	/** Name */