Commit 9064ed92 authored Jan 26, 2017 by Cyrille Pitchen Committed by Herbert Xu Feb 03, 2017

crypto: atmel-sha - add atmel_sha_wait_for_data_ready()



This patch simply defines a helper function to test the 'Data Ready' flag
of the Status Register. It also gives a chance for the crypto request to
be processed synchronously if this 'Data Ready' flag is already set when
polling the Status Register. Indeed, running synchronously avoid the
latency of the 'Data Ready' interrupt.

When the 'Data Ready' flag has not been set yet, we enable the associated
interrupt and resume processing the crypto request asynchronously from the
'done' task just as before.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent f07cebad

drivers/crypto/atmel-sha.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -434,6 +434,19 @@ static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
		atmel_sha_write(dd, SHA_MR, valmr);
		}

		static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
		atmel_sha_fn_t resume)
		{
		u32 isr = atmel_sha_read(dd, SHA_ISR);

		if (unlikely(isr & SHA_INT_DATARDY))
		return resume(dd);

		dd->resume = resume;
		atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
		return -EINPROGRESS;
		}

		static int atmel_sha_xmit_cpu(struct atmel_sha_dev dd, const u8 buf,
		size_t length, int final)
		{

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