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powerpc/mpc52xx_lpbfifo: optionally defer fifo transfer start

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Currently fifo transfer is started when submitting a transfer
request. Add posibility to defer the fifo transfer and start it
later by calling additional function. This change is backward
compatible, the behaviour of mpc52xx_lpbfifo_submit() is the same
for previous driver users, so there is no need to adapt them.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Anatolij Gustschin
2012-08-29 21:33:28 +00:00
parent 00e4b1975b
commit 9d9fd8871b
2 changed files with 36 additions and 1 deletions
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2
arch/powerpc/include/asm/mpc52xx.h
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@@ -307,6 +307,7 @@ struct mpc52xx_lpbfifo_request {
size_t size;
size_t pos; /* current position of transfer */
int flags;
int defer_xfer_start;
/* What to do when finished */
void (*callback)(struct mpc52xx_lpbfifo_request *);
@@ -323,6 +324,7 @@ struct mpc52xx_lpbfifo_request {
extern int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req);
extern void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req);
extern void mpc52xx_lpbfifo_poll(void);
extern int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req);
/* mpc52xx_pic.c */
extern void mpc52xx_init_irq(void);