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Commit fcfe18f8 authored by Joshua Clayton's avatar Joshua Clayton Committed by Greg Kroah-Hartman
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fpga-manager: altera-ps-spi: use bitrev8x4 



Speed up bit reversal by using hardware bit reversal
Add extra code to handle less than 4byte remnants, if any

Signed-off-by: default avatarJoshua Clayton <stillcompiling@gmail.com>
Signed-off-by: default avatarAlan Tull <atull@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3b88da4a

drivers/fpga/altera-ps-spi.c

+15 −4
Original line number Diff line number Diff line
@@ -149,12 +149,23 @@ static int altera_ps_write_init(struct fpga_manager *mgr, 


static void rev_buf(char *buf, size_t len)

{

	const char *fw_end = (buf + len);

	u32 *fw32 = (u32 *)buf;

	size_t extra_bytes = (len & 0x03);

	const u32 *fw_end = (u32 *)(buf + len - extra_bytes);



	/* set buffer to lsb first */

	while (buf < fw_end) {

	while (fw32 < fw_end) {

		*fw32 = bitrev8x4(*fw32);

		fw32++;

	}



	if (extra_bytes) {

		buf = (char *)fw_end;

		while (extra_bytes) {

			*buf = bitrev8(*buf);

			buf++;

			extra_bytes--;

		}

	}

}