[POWERPC] Uartlite: Add macros for register names

Add macros to define register names to improve readability.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

1 files changed, 21 insertions, 6 deletions

diff --git a/arch/powerpc/boot/uartlite.c b/arch/powerpc/boot/uartlite.c
index f4249a74c36..38a470b329e 100644
--- a/arch/powerpc/boot/uartlite.c
+++ b/arch/powerpc/boot/uartlite.c
@@ -16,30 +16,45 @@
 #include "io.h"
 #include "ops.h"
 
+#define ULITE_RX                0x00
+#define ULITE_TX                0x04
+#define ULITE_STATUS            0x08
+#define ULITE_CONTROL           0x0c
+
+#define ULITE_STATUS_RXVALID    0x01
+#define ULITE_STATUS_TXFULL     0x08
+
+#define ULITE_CONTROL_RST_RX    0x02
+
 static void * reg_base;
 
 static int uartlite_open(void)
 {
         /* Clear the RX FIFO */
-        out_be32(reg_base + 0x0C, 0x2);
+        out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
         return 0;
 }
 
 static void uartlite_putc(unsigned char c)
 {
-        while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */
-        out_be32(reg_base + 0x4, c);
+        u32 reg = ULITE_STATUS_TXFULL;
+        while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */
+                reg = in_be32(reg_base + ULITE_STATUS);
+        out_be32(reg_base + ULITE_TX, c);
 }
 
 static unsigned char uartlite_getc(void)
 {
-        while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */
-        return in_be32(reg_base);
+        u32 reg = ULITE_STATUS_RXVALID;
+        while (reg & ULITE_STATUS_RXVALID) /* spin on RXVALID bit */
+                reg = in_be32(reg_base + ULITE_STATUS);
+        return in_be32(reg_base + ULITE_RX);
 }
 
 static u8 uartlite_tstc(void)
 {
-        return ((in_be32(reg_base + 0x8) & 0x01) != 0);
+        u32 reg = in_be32(reg_base + ULITE_STATUS);
+        return reg & ULITE_STATUS_RXVALID;
 }
 
 int uartlite_console_init(void *devp, struct serial_console_data *scdp)