powerpc/powernv: Fix OPAL LPC access in Little Endian

We are passing pointers to the firmware for reads, we need to properly
convert the result as OPAL is always BE.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/opal.h

@@ -726,7 +726,7 @@ int64_t opal_xscom_write(uint32_t gcid, uint32_t pcb_addr, uint64_t val);
 int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type,
 		       uint32_t addr, uint32_t data, uint32_t sz);
 int64_t opal_lpc_read(uint32_t chip_id, enum OpalLPCAddressType addr_type,
-		      uint32_t addr, uint32_t *data, uint32_t sz);
+		      uint32_t addr, __be32 *data, uint32_t sz);
 int64_t opal_validate_flash(uint64_t buffer, uint32_t *size, uint32_t *result);
 int64_t opal_manage_flash(uint8_t op);
 int64_t opal_update_flash(uint64_t blk_list);

arch/powerpc/platforms/powernv/opal-lpc.c

@@ -24,25 +24,25 @@ static int opal_lpc_chip_id = -1;
 static u8 opal_lpc_inb(unsigned long port)
 {
 	int64_t rc;
-	uint32_t data;
+	__be32 data;
 
 	if (opal_lpc_chip_id < 0 || port > 0xffff)
 		return 0xff;
 	rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 1);
-	return rc ? 0xff : data;
+	return rc ? 0xff : be32_to_cpu(data);
 }
 
 static __le16 __opal_lpc_inw(unsigned long port)
 {
 	int64_t rc;
-	uint32_t data;
+	__be32 data;
 
 	if (opal_lpc_chip_id < 0 || port > 0xfffe)
 		return 0xffff;
 	if (port & 1)
 		return (__le16)opal_lpc_inb(port) << 8 | opal_lpc_inb(port + 1);
 	rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 2);
-	return rc ? 0xffff : data;
+	return rc ? 0xffff : be32_to_cpu(data);
 }
 static u16 opal_lpc_inw(unsigned long port)
 {
@@ -52,7 +52,7 @@ static u16 opal_lpc_inw(unsigned long port)
 static __le32 __opal_lpc_inl(unsigned long port)
 {
 	int64_t rc;
-	uint32_t data;
+	__be32 data;
 
 	if (opal_lpc_chip_id < 0 || port > 0xfffc)
 		return 0xffffffff;
@@ -62,7 +62,7 @@ static __le32 __opal_lpc_inl(unsigned long port)
 		       (__le32)opal_lpc_inb(port + 2) <<  8 |
 			       opal_lpc_inb(port + 3);
 	rc = opal_lpc_read(opal_lpc_chip_id, OPAL_LPC_IO, port, &data, 4);
-	return rc ? 0xffffffff : data;
+	return rc ? 0xffffffff : be32_to_cpu(data);
 }
 
 static u32 opal_lpc_inl(unsigned long port)