mmc: queue: initialization of command queue
Command Queueing (CQ) feature is introduced to eMMC
standard in revision 5.1. CQ includes new commands
for issuing tasks to the device, for ordering the
execution of previously issued tasks and for
additional task management functions.
The idea is to keep the legacy and CQ code as discrete
as possible. Hence, a separate queue is created for CQ.
The issuing path is non-blocking since several requests
(max. 32) can be queued at a time.
Change-Id: I5b48d1b3ed17585b907ec70ff7c8d583003ec9e1
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts & compilation
error]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts,
changed MMC_CAP2_CMD_QUEUE definition to bit 28]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index b07ab68..88deeed 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -57,11 +57,16 @@
unsigned long flags;
#define MMC_QUEUE_SUSPENDED 0
#define MMC_QUEUE_NEW_REQUEST 1
+ int (*issue_fn)(struct mmc_queue *, struct request *);
+ int (*cmdq_issue_fn)(struct mmc_queue *,
+ struct request *);
+ void (*cmdq_complete_fn)(struct request *);
void *data;
struct request_queue *queue;
struct mmc_queue_req mqrq[2];
struct mmc_queue_req *mqrq_cur;
struct mmc_queue_req *mqrq_prev;
+ struct mmc_queue_req *mqrq_cmdq;
bool wr_packing_enabled;
int num_of_potential_packed_wr_reqs;
int num_wr_reqs_to_start_packing;
@@ -79,7 +84,7 @@
};
extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
- const char *);
+ const char *, int);
extern void mmc_cleanup_queue(struct mmc_queue *);
extern int mmc_queue_suspend(struct mmc_queue *, int);
extern void mmc_queue_resume(struct mmc_queue *);
@@ -96,4 +101,7 @@
extern void print_mmc_packing_stats(struct mmc_card *card);
+extern int mmc_cmdq_init(struct mmc_queue *mq, struct mmc_card *card);
+extern void mmc_cmdq_clean(struct mmc_queue *mq, struct mmc_card *card);
+
#endif