s390/cio: add eadm subchannel driver

This driver allows usage of EADM subchannels. EADM subchannels
act as a communication vehicle for SCM increments.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 3781db22f427..3f42161d6bc6 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -440,6 +440,17 @@ config SCM_BUS
         help
           Bus driver for Storage Class Memory.
 
+config EADM_SCH
+        def_tristate m
+        prompt "Support for EADM subchannels"
+        depends on SCM_BUS
+        help
+          This driver allows usage of EADM subchannels. EADM subchannels act
+          as a communication vehicle for SCM increments.
+
+          To compile this driver as a module, choose M here: the
+          module will be called eadm_sch.
+
 endmenu
 
 menu "Dump support"
diff --git a/arch/s390/include/asm/isc.h b/arch/s390/include/asm/isc.h
index 1420a1115948..5ae606456b0a 100644
--- a/arch/s390/include/asm/isc.h
+++ b/arch/s390/include/asm/isc.h
@@ -14,6 +14,7 @@
 /* Regular I/O interrupts. */
 #define IO_SCH_ISC 3                    /* regular I/O subchannels */
 #define CONSOLE_ISC 1                   /* console I/O subchannel */
+#define EADM_SCH_ISC 4                  /* EADM subchannels */
 #define CHSC_SCH_ISC 7                  /* CHSC subchannels */
 /* Adapter interrupts. */
 #define QDIO_AIRQ_ISC IO_SCH_ISC        /* I/O subchannel in qdio mode */