From 9d9fd8871b4136755160bf95a9abd0d23d738ddc Mon Sep 17 00:00:00 2001 From: Anatolij Gustschin Date: Wed, 29 Aug 2012 21:33:28 +0000 Subject: 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 --- arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c | 35 ++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/platforms/52xx') diff --git a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c index d61fb1c0c1a0..2351f9e0fb6f 100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c +++ b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c @@ -170,7 +170,8 @@ static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req) out_be32(lpbfifo.regs + LPBFIFO_REG_CONTROL, bit_fields); /* Kick it off */ - out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01); + if (!lpbfifo.req->defer_xfer_start) + out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01); if (dma) bcom_enable(lpbfifo.bcom_cur_task); } @@ -421,6 +422,38 @@ int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req) } EXPORT_SYMBOL(mpc52xx_lpbfifo_submit); +int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req) +{ + unsigned long flags; + + if (!lpbfifo.regs) + return -ENODEV; + + spin_lock_irqsave(&lpbfifo.lock, flags); + + /* + * If the req pointer is already set and a transfer was + * started on submit, then this transfer is in progress + */ + if (lpbfifo.req && !lpbfifo.req->defer_xfer_start) { + spin_unlock_irqrestore(&lpbfifo.lock, flags); + return -EBUSY; + } + + /* + * If the req was previously submitted but not + * started, start it now + */ + if (lpbfifo.req && lpbfifo.req == req && + lpbfifo.req->defer_xfer_start) { + out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01); + } + + spin_unlock_irqrestore(&lpbfifo.lock, flags); + return 0; +} +EXPORT_SYMBOL(mpc52xx_lpbfifo_start_xfer); + void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req) { unsigned long flags; -- cgit v1.2.3