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powerpc/mpc52xx_lpbfifo: optionally defer fifo transfer start
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>
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00e4b1975b
commit
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2 changed files with 36 additions and 1 deletions
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@ -307,6 +307,7 @@ struct mpc52xx_lpbfifo_request {
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size_t size;
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size_t pos; /* current position of transfer */
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int flags;
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int defer_xfer_start;
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/* What to do when finished */
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void (*callback)(struct mpc52xx_lpbfifo_request *);
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@ -323,6 +324,7 @@ struct mpc52xx_lpbfifo_request {
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extern int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req);
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extern void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req);
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extern void mpc52xx_lpbfifo_poll(void);
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extern int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req);
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/* mpc52xx_pic.c */
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extern void mpc52xx_init_irq(void);
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@ -170,6 +170,7 @@ static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req)
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out_be32(lpbfifo.regs + LPBFIFO_REG_CONTROL, bit_fields);
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/* Kick it off */
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if (!lpbfifo.req->defer_xfer_start)
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out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01);
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if (dma)
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bcom_enable(lpbfifo.bcom_cur_task);
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@ -421,6 +422,38 @@ int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req)
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}
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EXPORT_SYMBOL(mpc52xx_lpbfifo_submit);
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int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req)
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{
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unsigned long flags;
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if (!lpbfifo.regs)
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return -ENODEV;
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spin_lock_irqsave(&lpbfifo.lock, flags);
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/*
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* If the req pointer is already set and a transfer was
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* started on submit, then this transfer is in progress
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*/
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if (lpbfifo.req && !lpbfifo.req->defer_xfer_start) {
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spin_unlock_irqrestore(&lpbfifo.lock, flags);
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return -EBUSY;
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}
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/*
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* If the req was previously submitted but not
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* started, start it now
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*/
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if (lpbfifo.req && lpbfifo.req == req &&
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lpbfifo.req->defer_xfer_start) {
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out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01);
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}
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spin_unlock_irqrestore(&lpbfifo.lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(mpc52xx_lpbfifo_start_xfer);
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void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req)
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{
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unsigned long flags;
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