s390: add scm bus driver

Bus driver to manage Storage Class Memory.

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

2 files changed, 58 insertions, 0 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 443fac9f1649..3781db22f427 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -433,6 +433,13 @@ config CHSC_SCH
 
           If unsure, say N.
 
+config SCM_BUS
+        def_bool y
+        depends on 64BIT
+        prompt "SCM bus driver"
+        help
+          Bus driver for Storage Class Memory.
+
 endmenu
 
 menu "Dump support"
diff --git a/arch/s390/include/asm/eadm.h b/arch/s390/include/asm/eadm.h
index 4a65803baa08..3922f5257172 100644
--- a/arch/s390/include/asm/eadm.h
+++ b/arch/s390/include/asm/eadm.h
@@ -2,6 +2,8 @@
 #define _ASM_S390_EADM_H
 
 #include <linux/types.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
 
 struct arqb {
         u64 data;
@@ -71,4 +73,53 @@ struct aob {
         struct msb msb[AOB_NR_MSB];
 } __packed __aligned(PAGE_SIZE);
 
+struct aob_rq_header {
+        struct scm_device *scmdev;
+        char data[0];
+};
+
+struct scm_device {
+        u64 address;
+        u64 size;
+        unsigned int nr_max_block;
+        struct device dev;
+        spinlock_t lock;
+        struct {
+                unsigned int persistence:4;
+                unsigned int oper_state:4;
+                unsigned int data_state:4;
+                unsigned int rank:4;
+                unsigned int release:1;
+                unsigned int res_id:8;
+        } __packed attrs;
+};
+
+#define OP_STATE_GOOD           1
+#define OP_STATE_TEMP_ERR       2
+#define OP_STATE_PERM_ERR       3
+
+struct scm_driver {
+        struct device_driver drv;
+        int (*probe) (struct scm_device *scmdev);
+        int (*remove) (struct scm_device *scmdev);
+        void (*handler) (struct scm_device *scmdev, void *data, int error);
+};
+
+int scm_driver_register(struct scm_driver *scmdrv);
+void scm_driver_unregister(struct scm_driver *scmdrv);
+
+int scm_start_aob(struct aob *aob);
+void scm_irq_handler(struct aob *aob, int error);
+
+struct eadm_ops {
+        int (*eadm_start) (struct aob *aob);
+        struct module *owner;
+};
+
+int scm_get_ref(void);
+void scm_put_ref(void);
+
+void register_eadm_ops(struct eadm_ops *ops);
+void unregister_eadm_ops(struct eadm_ops *ops);
+
 #endif /* _ASM_S390_EADM_H */