2 files changed, 26 insertions, 1 deletions

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 86d81cf75b70..b8b1b7a311f1 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -117,6 +117,7 @@ struct mmc_data {
 
         unsigned int            sg_len;         /* size of scatter list */
         struct scatterlist      *sg;            /* I/O scatter list */
+        s32                     host_cookie;    /* host private data */
 };
 
 struct mmc_request {
@@ -125,13 +126,16 @@ struct mmc_request {
         struct mmc_data         *data;
         struct mmc_command      *stop;
 
-        void                    *done_data;     /* completion data */
+        struct completion       completion;
         void                    (*done)(struct mmc_request *);/* completion function */
 };
 
 struct mmc_host;
 struct mmc_card;
+struct mmc_async_req;
 
+extern struct mmc_async_req *mmc_start_req(struct mmc_host *,
+                                           struct mmc_async_req *, int *);
 extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c67d19b5542a..9f9a4c64cde7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -106,6 +106,15 @@ struct mmc_host_ops {
          */
         int (*enable)(struct mmc_host *host);
         int (*disable)(struct mmc_host *host, int lazy);
+        /*
+         * It is optional for the host to implement pre_req and post_req in
+         * order to support double buffering of requests (prepare one
+         * request while another request is active).
+         */
+        void    (*post_req)(struct mmc_host *host, struct mmc_request *req,
+                            int err);
+        void    (*pre_req)(struct mmc_host *host, struct mmc_request *req,
+                           bool is_first_req);
         void    (*request)(struct mmc_host *host, struct mmc_request *req);
         /*
          * Avoid calling these three functions too often or in a "fast path",
@@ -144,6 +153,16 @@ struct mmc_host_ops {
 struct mmc_card;
 struct device;
 
+struct mmc_async_req {
+        /* active mmc request */
+        struct mmc_request      *mrq;
+        /*
+         * Check error status of completed mmc request.
+         * Returns 0 if success otherwise non zero.
+         */
+        int (*err_check) (struct mmc_card *, struct mmc_async_req *);
+};
+
 struct mmc_host {
         struct device           *parent;
         struct device           class_dev;
@@ -282,6 +301,8 @@ struct mmc_host {
 
         struct dentry           *debugfs_root;
 
+        struct mmc_async_req    *areq;          /* active async req */
+
         unsigned long           private[0] ____cacheline_aligned;
 };