can: flexcan: fix flexcan driver build for big endian on ARM and little endian on...

There is no reason to disallow building the driver on big-endian ARM kernels.
Furthermore, the current behavior is actually broken on little-endian PowerPC
as well.

The choice of register accessor functions must purely depend on the CPU
architecture, not which endianess the CPU is running on. Note that we nowadays
allow both big-endian ARM and little-endian PowerPC kernels.

With this patch applied, we will do the right thing in all four combinations.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index d447b881bbde1af6d25f6102b0f3efc639893d70..9e7d95dae2c7038478d6efadddba81e2778f47a9 100644 (file)
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -104,7 +104,7 @@ config CAN_JANZ_ICAN3
 
 config CAN_FLEXCAN
        tristate "Support for Freescale FLEXCAN based chips"
-       depends on (ARM && CPU_LITTLE_ENDIAN) || PPC
+       depends on ARM || PPC
        ---help---
          Say Y here if you want to support for Freescale FlexCAN.
 

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index aaed97bee4711d1cb2e8b1eb514fc3e343ad21e0..320bef2dba427f266511330bc11b1a4097368520 100644 (file)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -235,9 +235,12 @@ static const struct can_bittiming_const flexcan_bittiming_const = {
 };
 
 /*
- * Abstract off the read/write for arm versus ppc.
+ * Abstract off the read/write for arm versus ppc. This
+ * assumes that PPC uses big-endian registers and everything
+ * else uses little-endian registers, independent of CPU
+ * endianess.
  */
-#if defined(__BIG_ENDIAN)
+#if defined(CONFIG_PPC)
 static inline u32 flexcan_read(void __iomem *addr)
 {
        return in_be32(addr);