diff --git a/drivers/isdn/Kconfig b/drivers/isdn/Kconfig
index 2690e2c5a158..6fd1b3f84a29 100644
--- a/drivers/isdn/Kconfig
+++ b/drivers/isdn/Kconfig
@@ -6,7 +6,6 @@
 menuconfig ISDN
 	bool "ISDN support"
 	depends on NET && NETDEVICES
-	depends on !S390 && !UML
 	help
 	  ISDN ("Integrated Services Digital Network", called RNIS in France)
 	  is a fully digital telephone service that can be used for voice and
diff --git a/drivers/isdn/hardware/mISDN/Kconfig b/drivers/isdn/hardware/mISDN/Kconfig
index 078eeadf707a..a35bff8a93f5 100644
--- a/drivers/isdn/hardware/mISDN/Kconfig
+++ b/drivers/isdn/hardware/mISDN/Kconfig
@@ -14,7 +14,7 @@ config MISDN_HFCPCI
 
 config MISDN_HFCMULTI
 	tristate "Support for HFC multiport cards (HFC-4S/8S/E1)"
-	depends on PCI || CPM1
+	depends on (PCI || CPM1) && HAS_IOPORT
 	depends on MISDN
 	help
 	  Enable support for cards with Cologne Chip AG's HFC multiport
@@ -43,7 +43,7 @@ config MISDN_HFCUSB
 config MISDN_AVMFRITZ
 	tristate "Support for AVM FRITZ!CARD PCI"
 	depends on MISDN
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select MISDN_IPAC
 	help
 	  Enable support for AVMs FRITZ!CARD PCI cards
@@ -51,7 +51,7 @@ config MISDN_AVMFRITZ
 config MISDN_SPEEDFAX
 	tristate "Support for Sedlbauer Speedfax+"
 	depends on MISDN
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select MISDN_IPAC
 	select MISDN_ISAR
 	help
@@ -60,7 +60,7 @@ config MISDN_SPEEDFAX
 config MISDN_INFINEON
 	tristate "Support for cards with Infineon chipset"
 	depends on MISDN
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	select MISDN_IPAC
 	help
 	  Enable support for cards with ISAC + HSCX, IPAC or IPAC-SX
@@ -69,14 +69,14 @@ config MISDN_INFINEON
 config MISDN_W6692
 	tristate "Support for cards with Winbond 6692"
 	depends on MISDN
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  Enable support for Winbond 6692 PCI chip based cards.
 
 config MISDN_NETJET
 	tristate "Support for NETJet cards"
 	depends on MISDN
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	depends on TTY
 	select MISDN_IPAC
 	select MISDN_HDLC