linux-kernel - [PATCH v4] Lattice ECP3 FPGA: Correct endianness

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Date:	Wed, 23 Jul 2014 11:39:35 +0200
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.org,
	Stefan Roese <sr@...x.de>
Subject: [PATCH v4] Lattice ECP3 FPGA: Correct endianness

This code corrects endianness and avoids a sparse error.
Tested with Lattice ECP3-35 with Freescale i.MX6.
It also sends uevent in order to load it.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
---
 drivers/misc/lattice-ecp3-config.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/lattice-ecp3-config.c
b/drivers/misc/lattice-ecp3-config.c
index bb26f08..2c86319 100644
--- a/drivers/misc/lattice-ecp3-config.c
+++ b/drivers/misc/lattice-ecp3-config.c
@@ -16,6 +16,7 @@
 #include <linux/spi/spi.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
+#include <asm/unaligned.h>

 #define FIRMWARE_NAME    "lattice-ecp3.bit"

@@ -92,8 +93,8 @@ static void firmware_load(const struct firmware *fw,
void *context)
     /* Trying to speak with the FPGA via SPI... */
     txbuf[0] = FPGA_CMD_READ_ID;
     ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
-    dev_dbg(&spi->dev, "FPGA JTAG ID=%08x\n", *(u32 *)&rxbuf[4]);
-    jedec_id = *(u32 *)&rxbuf[4];
+    jedec_id = get_unaligned_be32(&rxbuf[4]);
+    dev_dbg(&spi->dev, "FPGA JTAG ID=%08x\n", jedec_id);

     for (i = 0; i < ARRAY_SIZE(ecp3_dev); i++) {
         if (jedec_id == ecp3_dev[i].jedec_id)
@@ -110,7 +111,8 @@ static void firmware_load(const struct firmware
*fw, void *context)

     txbuf[0] = FPGA_CMD_READ_STATUS;
     ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
-    dev_dbg(&spi->dev, "FPGA Status=%08x\n", *(u32 *)&rxbuf[4]);
+    status = get_unaligned_be32(&rxbuf[4]);
+    dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);

     buffer = kzalloc(fw->size + 8, GFP_KERNEL);
     if (!buffer) {
@@ -142,7 +144,7 @@ static void firmware_load(const struct firmware
*fw, void *context)
     for (i = 0; i < FPGA_CLEAR_LOOP_COUNT; i++) {
         txbuf[0] = FPGA_CMD_READ_STATUS;
         ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
-        status = *(u32 *)&rxbuf[4];
+        status = get_unaligned_be32(&rxbuf[4]);
         if (status == FPGA_STATUS_CLEARED)
             break;

@@ -165,8 +167,8 @@ static void firmware_load(const struct firmware
*fw, void *context)

     txbuf[0] = FPGA_CMD_READ_STATUS;
     ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
-    dev_dbg(&spi->dev, "FPGA Status=%08x\n", *(u32 *)&rxbuf[4]);
-    status = *(u32 *)&rxbuf[4];
+    status = get_unaligned_be32(&rxbuf[4]);
+    dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);

     /* Check result */
     if (status & FPGA_STATUS_DONE)
@@ -197,7 +199,7 @@ static int lattice_ecp3_probe(struct spi_device *spi)
     spi_set_drvdata(spi, data);

     init_completion(&data->fw_loaded);
-    err = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
+    err = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
                       FIRMWARE_NAME, &spi->dev,
                       GFP_KERNEL, spi, firmware_load);
     if (err) {
-- 
2.0.0
--
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