diff --git a/sys/dev/cs/if_cs.c b/sys/dev/cs/if_cs.c
index c264192b902d..3b75efc8369c 100644
--- a/sys/dev/cs/if_cs.c
+++ b/sys/dev/cs/if_cs.c
@@ -272,8 +272,6 @@ cs_cs89x0_probe(device_t dev)
 	if (error)
 		return (error);
 
-	sc->nic_addr = rman_get_start(sc->port_res);
-
 	if ((cs_inw(sc, ADD_PORT) & ADD_MASK) != ADD_SIG) {
 		/* Chip not detected. Let's try to reset it */
 		if (bootverbose)
@@ -704,7 +702,7 @@ static int
 cs_get_packet(struct cs_softc *sc)
 {
 	struct ifnet *ifp = sc->ifp;
-	int iobase = sc->nic_addr, status, length;
+	int status, length;
 	struct ether_header *eh;
 	struct mbuf *m;
 
@@ -746,7 +744,8 @@ cs_get_packet(struct cs_softc *sc)
 	m->m_len = length;
 
 	/* Get the data */
-	insw(iobase + RX_FRAME_PORT, m->m_data, (length+1)>>1);
+	bus_read_multi_2(sc->port_res, RX_FRAME_PORT, mtod(m, uint16_t *),
+	    (length + 1) >> 1);
 
 	eh = mtod(m, struct ether_header *);
 
@@ -869,7 +868,8 @@ cs_write_mbufs( struct cs_softc *sc, struct mbuf *m )
 static void
 cs_xmit_buf( struct cs_softc *sc )
 {
-	outsw(sc->nic_addr+TX_FRAME_PORT, sc->buffer, (sc->buf_len+1)>>1);
+	bus_write_multi_2(sc->port_res, TX_FRAME_PORT, (uint16_t *)sc->buffer,
+	    (sc->buf_len + 1) >> 1);
 	sc->buf_len = 0;
 }
 
diff --git a/sys/dev/cs/if_csreg.h b/sys/dev/cs/if_csreg.h
index be41e5c516d2..7ffe27602697 100644
--- a/sys/dev/cs/if_csreg.h
+++ b/sys/dev/cs/if_csreg.h
@@ -30,6 +30,8 @@
  * $FreeBSD$
  */
 
+#include <sys/rman.h>
+
 #define CS_89x0_IO_PORTS	0x0020
 
 #define PP_ChipID 0x0000	/* offset   0h -> Corp -ID              */
@@ -541,21 +543,21 @@ cs_inw(struct cs_softc *sc, int off)
 {
 	if (off & 1)
 		device_printf(sc->dev, "BUG: inw to an odd address.\n");
-	return ((inb(sc->nic_addr + off) & 0xff) |
-	    (inb(sc->nic_addr + off + 1) << 8));
+	return ((bus_read_1(sc->port_res, off)) |
+	    (bus_read_1(sc->port_res, off + 1) << 8));
 }
 #else
 static __inline uint16_t
 cs_inw(struct cs_softc *sc, int off)
 {
-	return (inw(sc->nic_addr + off));
+	return (bus_read_2(sc->port_res, off));
 }
 #endif
 
 static __inline void
 cs_outw(struct cs_softc *sc, int off, uint16_t val)
 {
-	outw(sc->nic_addr + off, val);
+	bus_write_2(sc->port_res, off, val);
 }
 
 static __inline uint16_t
diff --git a/sys/dev/cs/if_csvar.h b/sys/dev/cs/if_csvar.h
index 944450e88d5f..be1bfbd590e5 100644
--- a/sys/dev/cs/if_csvar.h
+++ b/sys/dev/cs/if_csvar.h
@@ -57,7 +57,6 @@ struct cs_softc {
 
 	int	flags;
 #define	CS_NO_IRQ	0x1
-	int 	nic_addr; 		/* Base IO address of card */
 	int	send_cmd;
 	int	line_ctl;		/* */
 	int	send_underrun;