[U-Boot] [Bug] IXP425 and e1000 network driver

[Stefan Althoefer <stefan.althoefer@web.de>]

Hi,

I found that IXP425 (big endian ARM) did not work with e1000 network
driver. The reason is broken access to controller registers.

I get it working with this patch:

--------
--- a/drivers/net/e1000.c
+++ b/drivers/net/e1000.c
@@ -105,12 +105,15 @@ static void e1000_phy_hw_reset(struct e1000_hw *hw);
 static int e1000_phy_reset(struct e1000_hw *hw);
 static int e1000_detect_gig_phy(struct e1000_hw *hw);

-#define E1000_WRITE_REG(a, reg, value) (writel((value), ((a)->hw_addr + E1000_##reg)))
-#define E1000_READ_REG(a, reg) (readl((a)->hw_addr + E1000_##reg))
-#define E1000_WRITE_REG_ARRAY(a, reg, offset, value) (\
-			writel((value), ((a)->hw_addr + E1000_##reg + ((offset) << 2))))
-#define E1000_READ_REG_ARRAY(a, reg, offset) ( \
-	readl((a)->hw_addr + E1000_##reg + ((offset) << 2)))
+#define E1000_WRITE_REG(a, reg, value) \
+	(writel(cpu_to_le32(value), ((a)->hw_addr + E1000_##reg)))
+#define E1000_READ_REG(a, reg) \
+	(le32_to_cpu(readl((a)->hw_addr + E1000_##reg)))
+#define E1000_WRITE_REG_ARRAY(a, reg, offset, value) \
+	(writel(cpu_to_le32(value),\
+		((a)->hw_addr + E1000_##reg + ((offset) << 2))))
+#define E1000_READ_REG_ARRAY(a, reg, offset) \
+	(le32_to_cpu(readl((a)->hw_addr + E1000_##reg + ((offset) << 2))))
 #define E1000_WRITE_FLUSH(a) {uint32_t x; x = E1000_READ_REG(a, STATUS);}

 #ifndef CONFIG_AP1000 /* remove for warnings */
---------

However, I'm not sure it this is the correct fix.

Is readl supposed to read raw data?

Is le32_to_cpu/cpu_to_le32 a function or a macro? In the later case the
code is not save or slow due to multiple argument expansion.

-- Stefan