linux-kernel - [PATCH v2 08/11] fpga-manager: altera-ps-spi: use bitrev8x4

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Message-Id: <20170614153635.2763-9-atull@kernel.org>
Date:   Wed, 14 Jun 2017 10:36:32 -0500
From:   Alan Tull <atull@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org,
        Joshua Clayton <stillcompiling@...il.com>
Subject: [PATCH v2 08/11] fpga-manager: altera-ps-spi: use bitrev8x4

From: Joshua Clayton <stillcompiling@...il.com>

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

Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
Signed-off-by: Alan Tull <atull@...nel.org>
---
 drivers/fpga/altera-ps-spi.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c
index 0db8def..14f14ef 100644
--- a/drivers/fpga/altera-ps-spi.c
+++ b/drivers/fpga/altera-ps-spi.c
@@ -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) {
-		*buf = bitrev8(*buf);
-		buf++;
+	while (fw32 < fw_end) {
+		*fw32 = bitrev8x4(*fw32);
+		fw32++;
+	}
+
+	if (extra_bytes) {
+		buf = (char *)fw_end;
+		while (extra_bytes) {
+			*buf = bitrev8(*buf);
+			buf++;
+			extra_bytes--;
+		}
 	}
 }
 
-- 
2.7.4